Python3-Win9x/PORT_STATUS.md

## Publication preparation: complete patch and regression checks

Date: 2026-10-26 UTC. User explicitly authorized commit and push to the existing Gitea `main`. Fetched `gitea/main`; pre-publication divergence was `0 0`. Reviewed the root publication unit: ignored `cpython/` source is represented by the tracked compatibility patch; ignored `MSVC600/` and build output remain local. The unrelated empty untracked `tp_mro` file is excluded.

Publication checks discovered the existing untracked `cpython/Include/internal/pycore_win9x_loadlibrary.h`, already referenced by patched source but absent from the previous generated patch. Regenerated the complete patch using an isolated temporary index containing all tracked nested modifications plus that reviewed new header; no changes to the real nested index. Verified byte equality with that isolated staged diff, checked and applied it against an isolated pristine upstream HEAD index, and verified the restored header bytes exactly. This supersedes the earlier tracked-only patch equality check; `git diff` alone cannot capture an untracked new header.

All 159 changed/new standalone Python regression scripts passed with their required source/header arguments (evidence: `build/manual-20261026-type-add-method/publication-tests-correct-argv.json`). An initial argument-free batch was invalid for scripts requiring positional paths and was rerun correctly; its invocation errors are not source regressions. Full shell harness remains blocked by the lifecycle scan guard as documented below. Final staging checks also report pre-existing trailing spaces inside three newly tracked source-order test fixtures (`find-name-in-mro`, `get-subclasses-index`, `type-new-get-bases-winner`), in addition to the generated patch's required single-space context markers; left fixture content unchanged and all 159 tests pass. Latest compile probe remains 108/109, blocked in `typeobject.c(6231)`; no linked interpreter or target-runtime claim.

---

## Manual continuation: descriptor registration and hash override C89 locals

Date: 2026-10-26 UTC. Workspace `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`; CPython `v3.11.16`, HEAD `41388c9cb160d0886d5ca00d2e6c8782608a4549`. Actual MSVC6 compiler exercised through Wine using the existing project probe. Preserved the existing dirty/untracked work; no reset, clean, stash, commit or push. Direct narrowly scoped edits, no parallel implementation lane.

Evidence directory: `build/manual-20261026-type-add-method/`. Baseline: 88 standalone typeobject regression scripts passed; forced-fresh probe exit 2, `total=109 compiled=108 cached=0 skipped=0`, first errors at `typeobject.c(5789)` (`PyObject`/`name`) and `(5801)` (`err`). `before-probe.log` preserves diagnostics; `typeobject.before.c` and `before-hashes.json` preserve pre-edit source evidence.

Three strict RED/GREEN slices, each followed by a real forced-fresh compiler probe:

1. `type_add_method()`: move only `name` and `err` declarations to the opening block. Existing branch assignments, creation calls and reference cleanup remain in place. New `scripts/vc6-typeobject-add-method-locals-c89.test.py` failed before the edit (exit 1, expected opening-declarations assertion), then passed (exit 0); 89 standalone typeobject tests passed. Compiler cleared those errors and advanced to line 5845 (`dict`); probe exit 2.
2. `type_add_members()` and `type_add_getset()`: declare `dict` at entry but retain `dict = type->tp_dict` after the same NULL guard. New `scripts/vc6-typeobject-add-descriptors-dict-c89.test.py` failed for both declarations before editing (exit 1), then passed both functions (exit 0). Compiler cleared both errors and advanced to line 5952 (`r`); probe exit 2.
3. `overrides_hash()`: declare `int r;` at entry; retain the first dictionary lookup after `assert(dict != NULL)` and retain the conditional second lookup and result/error propagation. New `scripts/vc6-typeobject-overrides-hash-r-c89.test.py` failed before editing (exit 1), then passed (exit 0). Final forced-fresh probe exit 2, `total=109 compiled=108 cached=0 skipped=0`; first errors now `typeobject.c(6231)` C2275 `PyObject` and C2065 `bases`. Later `dict`/`doc` errors remain untouched. See `final-probe.log`.

Exact probe invocation for each log: `XDG_RUNTIME_DIR=/home/ubuntu/r WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh`. Logs: `before-probe.log`, `after-probe.log`, `descriptors-after-probe.log`, `final-probe.log`.

Final standalone coverage: 91 `scripts/vc6-typeobject-*.test.py` scripts passed, zero failed (`final-tests.json`). These are source-structure/order regressions, not interpreter runtime tests. Full `bash scripts/vc6-probe-pythoncore-frontier.test.sh` was attempted but blocked before execution by the Hermes lifecycle guard: scan budget exhausted at remote-read depth 1. It is NOT reported as passing; its embedded tests were not extracted or reconstructed. Nested `git diff --check` and the outer check excluding the generated patch passed. The final unfiltered outer check exits 2 on single-space unified-diff context lines inside the regenerated `.patch` file; nested source whitespace remains clean. Kept these required context markers intact rather than corrupting the byte-equal patch. The exact session delta is in `source.diff`; only `cpython/Objects/typeobject.c` changed among all pre-existing files inventoried under scripts/, cpython/Objects/ and compat/ before intentional compatibility-patch regeneration.

Regenerated `compat/msvc600/cpython-3.11.16-vc6-headers.patch` from the complete nested `git diff`; verified byte equality against a fresh diff. The complete patch passes `git apply --cached --check` against an isolated pristine HEAD index (exit 0), without touching the user's real Git index or working tree. Prior patch backed up in the evidence directory. Files changed by this session: the C source, three new standalone regressions, the compatibility patch and this status entry.

Compile-only progress: still no linked pythoncore/python.exe, Wine interpreter execution or actual Windows 98 SE validation. Next narrow slice: fresh-confirm and isolate the `bases` declaration in the function at `typeobject.c(6231)`. No completion percentage or runtime compatibility claimed.

---

## `object_new()` `obj` C89 declaration slice (frontier advances)

Date: 2026-10-26 UTC. Requested `/home/ubuntu/projects/python-win9x` is absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read `PORT_STATUS.md`, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before editing. Nested CPython baseline verified: tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`. Preserved all pre-existing outer/nested dirty and untracked paths; no reset, clean, stash, discard, commit, push, or publication.

Forced-fresh pre-change probe: `mkdir -p build/cron-20261026-recheck; XDG_RUNTIME_DIR=/home/ubuntu/r WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261026-recheck/probe.log 2>&1` — probe exit 2; summary `total=109 compiled=108 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. The first stable errors were `typeobject.c(4673)` C2275 `PyObject` / C2065 `obj` for a declaration after statements. Full capture: `build/cron-20261026-recheck/probe.log`.

One authenticated Codex CLI 0.153.4 coding lane followed strict TDD. New `scripts/vc6-typeobject-object-new-obj-c89.test.py` failed before production edit (RED exit 1: `object_new: obj must be in the opening declaration block (C89)`). Minimal source change in `cpython/Objects/typeobject.c`: declare `PyObject *obj;` in `object_new()`'s opening block and replace the original initialized declaration with `obj = type->tp_alloc(type, 0);` at the same execution point. Focused regression passed (exit 0); all 87 `scripts/vc6-typeobject-*.test.py` tests passed (exit 0). Exact-delta/preservation verification passed; all 286 other pre-existing dirty/untracked files remained unchanged. Nested `git diff --check -- Objects/typeobject.c` passed (exit 0); the new-test no-index whitespace check emitted no diagnostics (exit 1 because files differ).

The first delegated probe attempt exited 1 before compilation because Wine used a read-only runtime lock path. Parent retried with a writable runtime: `mkdir -p /home/ubuntu/r build/cron-20261026-after-object-new-obj; chmod 700 /home/ubuntu/r; XDG_RUNTIME_DIR=/home/ubuntu/r WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261026-after-object-new-obj/probe.log 2>&1` — compiler probe exit 2; summary `total=109 compiled=108 cached=0 skipped=0`. The former line-4673 errors cleared; first remaining diagnostics advance to `typeobject.c(4897)` C2275 `PyTypeObject` / C2065 `newto`, a separate declaration family left untouched. Capture: `build/cron-20261026-after-object-new-obj/probe.log`.

Files changed by this slice: `cpython/Objects/typeobject.c`, new `scripts/vc6-typeobject-object-new-obj-c89.test.py`, and this status entry. Compiler-probe progress only: no linked `pythoncore`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution. No completed port is claimed. Next frontier: fresh-confirm and isolate only the `typeobject.c(4897)` `newto` declaration family.

---

## `PyType_Type` designated-initializer C89 slice (frontier advances)

Date: 2026-10-26 UTC. Requested `/home/ubuntu/projects/python-win9x` is absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read this status, `README.md`, and the CPython 3.11.16/MSVC6 reference before editing. CPython baseline: tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`. Preserved extensive pre-existing outer and nested dirty/untracked state; no reset, clean, stash, discard, commit, push, or publication.

Forced-fresh pre-change command: `mkdir -p /home/ubuntu/r build/cron-20261026-fresh-designator; XDG_RUNTIME_DIR=/home/ubuntu/r WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261026-fresh-designator/probe.log 2>&1` — exit 2; `total=109 compiled=108 cached=0 skipped=0`; first stable diagnostics were `typeobject.c(4474)` and `(4520)`, C2059 on `.nb_or` and `.tp_vectorcall`. `_blake2/blake2s_impl.c` compiled. Capture: `build/cron-20261026-fresh-designator/probe.log`.

One focused authenticated Codex CLI 0.153.4 coding lane used strict TDD. Added `scripts/vc6-typeobject-static-initializers-c89.test.py`; against the original `typeobject.c` snapshot the corrected fixture fails as expected with `type_as_number: designated initializer is not VC6/C89 compatible` (exit 1). Minimal production change in `cpython/Objects/typeobject.c` converts the exact two unsupported designated initializers to positional structure initializers while checking all 36 `PyNumberMethods` and 48 `_typeobject` field mappings against the actual header layout. Focused fixture passes (exit 0); all 86 `scripts/vc6-typeobject-*.test.py` tests pass (exit 0); nested and outer scoped `git diff --check` pass (exit 0). Preservation verification: 4,901 pre-existing files byte-identical, only intended C source changed among prior files, Git indexes unchanged, and no status edits by the coding lane. The status log's attempted probe initially could not create Wine server locks with a repository-local runtime (exit 1); parent reran with `/home/ubuntu/r`.

Forced-fresh post-change command: `mkdir -p build/cron-20261026-after-designator; XDG_RUNTIME_DIR=/home/ubuntu/r WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261026-after-designator/probe.log 2>&1` — exit 2; `total=109 compiled=108 cached=0 skipped=0`. Former line-4474/4520 designated-initializer diagnostics cleared; first stable diagnostics now advance to `typeobject.c(4673)` C2275 `PyObject` / C2065 `obj`, a separate declaration family left untouched. Capture: `build/cron-20261026-after-designator/probe.log`.

Files changed by this slice: `cpython/Objects/typeobject.c`, new `scripts/vc6-typeobject-static-initializers-c89.test.py`, and this status record. Compiler-probe progress only: no linked `pythoncore`/`python.exe`, Wine interpreter execution, or Windows 98 SE execution. No completed port is claimed.

---

## `_PyType_GetSubclasses()` `obj` C89 declaration slice (frontier advances)

Date: 2026-10-26 UTC. Requested `/home/ubuntu/projects/python-win9x` is absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read this status, `README.md`, and the profile's `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before editing. CPython baseline is tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`. Preserved the extensive pre-existing outer and nested dirty/untracked state; no reset, clean, stash, discard, commit, push, or publication.

Forced-fresh pre-change command: `mkdir -p /home/ubuntu/r build/cron-20261026-current-reprobe; XDG_RUNTIME_DIR=/home/ubuntu/r WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261026-current-reprobe/probe.log 2>&1` — probe exit 2; `total=109 compiled=108 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First stable errors in `cpython/Objects/typeobject.c`: line 4228 C2143 before `type`, line 4229 C2065 `obj`. Capture: `build/cron-20261026-current-reprobe/probe.log`.

One focused authenticated Codex CLI 0.153.4 lane was used, no commits. Strict TDD: new `scripts/vc6-typeobject-get-subclasses-obj-c89.test.py` failed before production edit (reported exit 1: `obj` absent from opening C89 declarations); source snapshot verified unchanged during RED. Minimal production edit in `cpython/Objects/typeobject.c` hoists `PyObject *obj;` into `_PyType_GetSubclasses()`'s entry locals and changes only its point-of-use declaration to `obj = PyWeakref_GET_OBJECT(ref);`, retaining evaluation timing and control flow. The lane updated only the directly coupled `get-subclasses` structural fixtures for the added local and assignment. Focused four `scripts/vc6-typeobject-get-subclasses-*.test.py` tests pass (exit 0); all 85 `scripts/vc6-typeobject-*.test.py` regressions pass (exit 0). Nested `git diff --check -- Objects/typeobject.c` and outer `git diff --check -- scripts/vc6-typeobject-get-subclasses-*.test.py` pass (exit 0). No changes to unrelated pre-existing paths were reported by the lane's snapshot check.

Forced-fresh post-change command: `mkdir -p /home/ubuntu/r build/cron-20261026-after-obj; XDG_RUNTIME_DIR=/home/ubuntu/r WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261026-after-obj/probe.log 2>&1` — probe exit 2; `total=109 compiled=108 cached=0 skipped=0`. The line-4228/4229 errors cleared. First remaining compiler diagnostics are now `typeobject.c(4474)` C2059 on designated initializer `.nb_or`, followed by another at line 4520; the next frontier is a distinct VC6 language-feature blocker, left untouched. Capture: `build/cron-20261026-after-obj/probe.log`.

Files changed by this slice: `cpython/Objects/typeobject.c`, new `scripts/vc6-typeobject-get-subclasses-obj-c89.test.py`, the directly coupled `get-subclasses` index/ref/subclasses regression fixtures, and this status record. Compiler-probe progress only: no linked `pythoncore`/`python.exe`, Wine interpreter run, or Windows 98 SE execution. No completed port is claimed.

---

## Diagnostics-only: requested BLAKE2 frontier stale; current typeobject blocker

Date: 2026-10-26 UTC. Requested path `/home/ubuntu/projects/python-win9x` is absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read this status, `README.md`, and the CPython 3.11.16/MSVC6 reference before action. CPython baseline verified at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`. Preserved extensive pre-existing outer/nested work; no reset, clean, stash, discard, commit, push, or publication.

The requested `_blake2/blake2s_impl.c` sequence is no longer current. Its recorded condition was rechecked with forced-fresh command `mkdir -p /home/ubuntu/r build/cron-20261026-current-reprobe; XDG_RUNTIME_DIR=/home/ubuntu/r WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261026-current-reprobe/probe.log 2>&1` — exit 2; summary `total=109 compiled=108 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiles. The first errors now remain in `cpython/Objects/typeobject.c` at line 4228 (C2143 before `type`) and 4229 (C2065 `obj`); prior reported blockers at lines 4214–4227 are cleared. Full capture: `build/cron-20261026-current-reprobe/probe.log`.

No implementation was attempted because the current frontier is in a different source file/function than the requested slice and the checked-in local `MSVC600/VC98/bin/VCVARS32.BAT` path is absent (check exit 1). No test or production files were changed by this run. This is diagnostics-only, not a TDD implementation cycle. Compiler-probe progress only: no linked `pythoncore`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution. Next frontier: obtain the external MSVC600 launcher and then strictly test-first isolate the actual `typeobject.c` line-4228/4229 declaration family, after checking that recorded source state again. No completed port is claimed.

---

## `_PyType_GetSubclasses()` loop index `i` C89 declaration slice (frontier advances)

Date: 2026-10-25 20:39 UTC. Requested checkout `/home/ubuntu/projects/python-win9x` is absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read `PORT_STATUS.md`, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved existing work; no reset, clean, stash, discard, commit, push, or publication. CPython baseline: v3.11.16, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded `_PyType_GetSubclasses()` declaration frontier was re-probed forced-fresh and remained valid but advanced: `_blake2/blake2s_impl.c` compiled; first stable errors moved to the late `Py_ssize_t i = 0;` at `typeobject.c(4223)`. Exact pre-change command: `XDG_RUNTIME_DIR=/home/ubuntu/r WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-current-blake2-reprobe/probe.log 2>&1` — exit 2; summary `total=109 compiled=108 cached=0 skipped=0`. Compiler diagnostics: C2275 `Py_ssize_t`, C2146 before `i`, C2065 undeclared `i`; subsequent `ref`/`obj` declarations were separate later blockers. The prior `_blake2` frontier is stale; `typeobject.c` is current. Capture: `build/cron-current-blake2-reprobe/probe.log`.

Coding delegation: Hermes delegation provider could not start (Anthropic credentials unavailable); authenticated Codex CLI 0.153.4 was used as one focused coding lane. Strict TDD RED observed before production edit: new `scripts/vc6-typeobject-get-subclasses-index-c89.test.py` failed exit 1 with `_PyType_GetSubclasses: i must be declared in the opening declaration block (C89)`; source equality against pre-RED snapshot was confirmed. Minimal production change in `cpython/Objects/typeobject.c`: declare `Py_ssize_t i;` with opening locals and replace late initialized declaration with `i = 0;` at the original point. The directly coupled `scripts/vc6-typeobject-get-subclasses-subclasses-c89.test.py` expectation was minimally widened to allow the new opening local. Leave later `ref`/`obj` blockers untouched. Focused test and coupled test passed (exit 0); all 83 `scripts/vc6-typeobject-*.test.py` tests passed (exit 0). Parent independently reran these and both nested/outer scoped `git diff --check`; all exit 0.

Forced-fresh post-change command: `XDG_RUNTIME_DIR=/home/ubuntu/r WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-current-blake2-after-i/probe.log 2>&1` — exit 2; summary still `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. Former `i` diagnostics cleared. First stable remaining diagnostics advance to `typeobject.c(4225)` C2275 `PyObject` / C2065 `ref`, then line 4228 C2143 and 4229 C2065 `obj`; `ref` is the next distinct declaration family and remains untouched. Capture: `build/cron-current-blake2-after-i/probe.log`.

Files changed by the slice: `cpython/Objects/typeobject.c`, new `scripts/vc6-typeobject-get-subclasses-index-c89.test.py`, narrowly updated `scripts/vc6-typeobject-get-subclasses-subclasses-c89.test.py`, and this `PORT_STATUS.md` entry. Compiler-probe progress only: no linked `pythoncore`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution. Next frontier: force-fresh confirm and isolate only `_PyType_GetSubclasses()`'s `ref` C89 declaration. No completed port is claimed.

---

## `_PyType_GetSubclasses()` `subclasses` C89 declaration slice (frontier advances)

Date: 2026-10-25 UTC. User-requested checkout `/home/ubuntu/projects/python-win9x` is absent; worked in `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Before changes, read this status, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md`. CPython baseline remains tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`. Preserved existing dirty/untracked changes; no reset, clean, stash, discard, commit, push, or publication.

Forced-fresh pre-change command: `mkdir -p /home/ubuntu/r build/cron-20261026-current-reprobe; XDG_RUNTIME_DIR=/home/ubuntu/r WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261026-current-reprobe/probe.log 2>&1` — exit 2; summary `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First stable diagnostics at `cpython/Objects/typeobject.c(4214)`: C2275 `PyObject` and C2065 `subclasses`; later errors in this function include separate declarations. Capture: `build/cron-20261026-current-reprobe/probe.log`.

Hermes coding delegation attempted once but failed before launch because Anthropic credentials are unavailable. Authenticated Codex CLI 0.153.4 was used as one focused coding lane with strict TDD. New `scripts/vc6-typeobject-get-subclasses-subclasses-c89.test.py` failed before production edit (RED exit 1: `_PyType_GetSubclasses: subclasses must be declared at function entry (C89)`). The minimal production edit in `cpython/Objects/typeobject.c` declares `PyObject *subclasses;` at function entry and replaces only the late initialized declaration with `subclasses = self->tp_subclasses;` after the existing allocation-failure guard, preserving read timing. Focused test passed; all 82 `scripts/vc6-typeobject-*.test.py` tests passed (exit 0). Preservation verification confirmed 282 pre-existing dirty/untracked files unchanged; nested and outer scoped `git diff --check` passed (exit 0).

Forced-fresh post-change command: `mkdir -p /home/ubuntu/r build/cron-20261026-after-subclasses; XDG_RUNTIME_DIR=/home/ubuntu/r WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261026-after-subclasses/probe.log 2>&1` — exit 2; summary `total=109 compiled=108 cached=0 skipped=0`. The former `subclasses` diagnostics cleared; first remaining blocker advances within `_PyType_GetSubclasses()` to `Py_ssize_t i` at line 4223 (C2275/C2146/C2065), followed by the separate `ref` declaration at 4224 and `obj` declaration at 4227; these remain untouched. Full capture: `build/cron-20261026-after-subclasses/probe.log`.

Files changed by this slice: `cpython/Objects/typeobject.c`, new `scripts/vc6-typeobject-get-subclasses-subclasses-c89.test.py`, and this status entry. Compiler-probe progress only: no linked `pythoncore`/`python.exe`, Wine interpreter execution, or Windows 98 SE execution. Next frontier: force-fresh confirm and isolate only `_PyType_GetSubclasses()`'s loop-index `i` declaration. No completed port is claimed.

---

## `type_dealloc()` `et` C89 declaration slice (frontier advances)

Date: 2026-11-17 UTC. The requested checkout `/home/ubuntu/projects/python-win9x` does not exist; worked in `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read `PORT_STATUS.md`, `README.md`, and the CPython 3.11.16/MSVC6 reference before acting. CPython baseline is tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`. Preserved existing work; no reset, clean, stash, discard, commit, push, or publication. Outer working tree was already extensively dirty/untracked; nested CPython also had extensive pre-existing modifications.

Forced-fresh pre-change command: `XDG_RUNTIME_DIR=/home/ubuntu/r WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261117-current-reprobe.log 2>&1` — exit 2; summary `total=109 compiled=108 cached=0 skipped=0`. First stable diagnostics at `cpython/Objects/typeobject.c(4191)`: C2275 `PyHeapTypeObject` and C2065 `et`; member-access errors cascade. Exact output captured in the log.

Hermes coding delegation was attempted but failed before launch because configured Anthropic credentials are unavailable; authenticated Codex CLI is installed, but delegated tool cannot select its provider. Implemented one narrow strict-TDD slice directly. RED Python structural assertion failed as expected (exit 1): `type_dealloc: et must be declared at function entry (C89)`. Minimal production edit in `cpython/Objects/typeobject.c`: add `PyHeapTypeObject *et;` at function entry and replace only the initialized declaration with `et = (PyHeapTypeObject *)type;` at the same point after `PyObject_Free((char *)type->tp_doc);`. Focused assertion passed (exit 0); all 81 applicable `scripts/vc6-typeobject-*.test.py` tests passed (0 failures, exit 0); `git -C cpython diff --check -- Objects/typeobject.c` passed (exit 0).

Forced-fresh post-change probe: same command with capture `build/cron-20261117-after-et.log` — exit 2; summary remains `total=109 compiled=108 cached=0 skipped=0`. Former line-4191 `et` diagnostics cleared. Next first stable diagnostics advance to `typeobject.c(4214)` in `_PyType_GetSubclasses()`: C2275 `PyObject` and C2065 `subclasses`; later declarations are separate and untouched. Files changed: `cpython/Objects/typeobject.c`, new `scripts/vc6-typeobject-type-dealloc-et-c89.test.py`, and `PORT_STATUS.md`; probe logs are build artifacts. Compiler-probe progress only: no linked `pythoncore`/`python.exe`, Wine interpreter run, or Windows 98 SE execution. Next frontier: fresh-confirm and isolate only `_PyType_GetSubclasses()` `subclasses` declaration. No completed port is claimed.

---



Date: 2026-10-25 UTC. Requested checkout `/home/ubuntu/projects/python-win9x` does not exist; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read the current `PORT_STATUS.md`, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md`. Preserved the extensive existing dirty/untracked workspace; no reset, clean, stash, discard, commit, push, or publication. CPython baseline verified at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

Forced-fresh command: `XDG_RUNTIME_DIR=/home/ubuntu/r WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261025-run/probe.log 2>&1` — exit 2; summary `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First stable diagnostics reconfirm at `cpython/Objects/typeobject.c(4191)`: C2275 `PyHeapTypeObject` and C2065 `et`; subsequent member-access errors cascade. Full capture: `build/cron-20261025-run/probe.log`. The expected `MSVC600/VC98/bin/VCVARS32.BAT` path is absent (test exit 1), although the project probe itself successfully invoked the configured compiler.

One focused coding subagent was attempted, as required, but delegation failed before starting because the configured Anthropic provider has no credentials. No alternate coding CLI was available through the delegation workflow; no code or test edits were made. The exact `et` frontier is confirmed, but this run is diagnostics-only rather than a TDD implementation slice. Files changed by this run: `PORT_STATUS.md` only; the compiler log is a build artifact. This is compiler-probe progress only: no linked `pythoncore`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution. Next: perform one strict-TDD, narrowly scoped `et` declaration slice with an available authenticated coding lane; then run applicable regressions and another forced-fresh probe. No completed port is claimed.

---

## Diagnostics-only: current compiler frontier reconfirmed at `typeobject.c(4191)`

Date: 2026-10-25 UTC. Requested `/home/ubuntu/projects/python-win9x` does not exist; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read `PORT_STATUS.md`, `README.md`, and the CPython Win9x/MSVC6 reference. Preserved existing work: outer checkout has 153 status entries (many modified/untracked), and nested CPython has 131; no reset, clean, stash, discard, commit, push, or publication. Baseline verified at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`. Local VC6 launcher `MSVC600/VC98/bin/VCVARS32.BAT` is absent (check exit 1).

The requested `_blake2/blake2s_impl.c` condition is stale: forced-fresh command `mkdir -p /home/ubuntu/r build/cron-20261025-current-reprobe; XDG_RUNTIME_DIR=/home/ubuntu/r WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261025-current-reprobe/probe.log 2>&1` returned probe exit 2, summary `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First stable diagnostics remain in `cpython/Objects/typeobject.c(4191)`: C2275 `PyHeapTypeObject` and C2065 `et`, with subsequent member-access diagnostics cascading. Full capture: `build/cron-20261025-current-reprobe/probe.log`.

The required focused coding subagent could not start because configured Anthropic credentials are unavailable; Claude CLI is absent, and no alternate authenticated coding CLI was used. No source or tests were changed. Files changed by this run: `PORT_STATUS.md` only; probe log is a build artifact. Compiler-probe progress only: no `pythoncore`/`python.exe` link, Wine interpreter execution, or Windows 98 SE execution. Next frontier: restore the external local-only MSVC600 launcher/toolchain, then use a focused strict-TDD coding lane to isolate the `et` declaration at `typeobject.c(4191)`; no completed port is claimed.

---

## `type_getattro()` local descriptor getter C89 declaration slice (frontier advances)

Date: 2026-10-25 UTC. The requested `/home/ubuntu/projects/python-win9x` path is absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read `PORT_STATUS.md`, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before editing. CPython checkout verified at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`. Preserved extensive pre-existing work (outer repo has many dirty/untracked paths; CPython has many modified files); no reset, clean, stash, discard, commit, push, or publication. Anthropic coding delegation unavailable (no credentials); implementation done directly with TDD.

Forced-fresh pre-change probe: `mkdir -p /home/ubuntu/r build/cron-20261025-current-reprobe && XDG_RUNTIME_DIR=/home/ubuntu/r WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261025-current-reprobe/probe.log 2>&1` — exit 2; summary `total=109 compiled=108 cached=0 skipped=0`. `_blake2s_impl.c` compiled; first stable errors at `cpython/Objects/typeobject.c(4025)`: C2275 `descrgetfunc`, C2146 before `local_get`, C2065 `local_get`, then C2063 at call. VC6 banner independently verified through Wine: `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86` (exit 0).

Strict TDD: new `scripts/vc6-typeobject-type-getattro-local-get-c89.test.py` failed before production edit (RED exit 1, assertion that `local_get` must precede statements in its block). The sole production edit in `cpython/Objects/typeobject.c` declares `descrgetfunc local_get;` before the block's statements, then assigns `local_get = Py_TYPE(attribute)->tp_descr_get;` at the original evaluation point. Focused test passed (exit 0); parent independently ran all 81 `scripts/vc6-typeobject-*.test.py` tests with the source path argument (81 passed, 0 failed, exit 0). `git -C cpython diff --check -- Objects/typeobject.c` passed (exit 0).

Forced-fresh post-change command: `mkdir -p /home/ubuntu/r build/cron-20261025-after-type-getattro; XDG_RUNTIME_DIR=/home/ubuntu/r WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261025-after-type-getattro/probe.log 2>&1` — exit 2; summary still `total=109 compiled=108 cached=0 skipped=0`. The former line-4025 diagnostics cleared. First remaining stable family advances to `typeobject.c(4191)`: C2275 `PyHeapTypeObject` and C2065 `et`; subsequent member-access errors cascade. Full capture: `build/cron-20261025-after-type-getattro/probe.log`.

Files changed by this run: `cpython/Objects/typeobject.c`, new `scripts/vc6-typeobject-type-getattro-local-get-c89.test.py`, and this status entry. Compiler-probe progress only: no linked `pythoncore`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution. Next frontier: fresh-confirm and isolate only the `et` declaration at `typeobject.c(4191)`. No completed port is claimed.

---

## `_PyType_Lookup()` cache-update `entry` C89 declaration slice (frontier advances)

Date: 2026-10-25 UTC. Requested `/home/ubuntu/projects/python-win9x` is absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read `PORT_STATUS.md`, `README.md`, and the CPython 3.11.16/Win9x/MSVC6 reference. CPython baseline verified at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`. Preserved pre-existing dirty/untracked work; no reset, clean, stash, discard, commit, push, or publication.

Forced-fresh pre-change probe: `XDG_RUNTIME_DIR=/home/ubuntu/r WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2; `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First stable diagnostic: `cpython/Objects/typeobject.c(3927)` C2143 at the late initialized `struct type_cache_entry *entry`; subsequent errors begin at line 4024. Full log: `build/cron-20261025-autonomous-reprobe/probe.log`.

One authenticated Codex CLI 0.153.4 coding lane followed strict TDD. New `scripts/vc6-typeobject-lookup-cache-entry-c89.test.py` failed before source edit (RED exit 1: `_PyType_Lookup cache update: entry must precede statements (C89)`). The sole production change in `cpython/Objects/typeobject.c` declares `entry` before the cache-update block statements and changes the initialized declaration into `entry = &cache->hashtable[h];` immediately after the unchanged hash recalculation. Focused test passed; parent independently ran all 80 `scripts/vc6-typeobject-*.test.py` tests (80 passed, 0 failed). The lane's first post-change probe attempt failed before compilation because Wine tried to create a lock under a read-only runtime path (exit 1); parent retried with `/home/ubuntu/r` and forced fresh successfully.

Post-change probe command (same as above): exit 2; `total=109 compiled=108 cached=0 skipped=0`. The former line-3927 diagnostic cleared. First remaining diagnostics are in `typeobject.c(4025)`: C2275 `descrgetfunc`, C2146 before `local_get`, C2065 `local_get` (later errors are cascading/additional blockers). Capture: `build/cron-20261025-after-cache-entry/probe.log`. Nested and outer scoped `git diff --check` passed (exit 0); exact source delta and preservation of all other baseline tracked/untracked paths, including pre-existing `PORT_STATUS.md` edits, were independently checked.

Files changed by this slice: `cpython/Objects/typeobject.c`, new `scripts/vc6-typeobject-lookup-cache-entry-c89.test.py`, and this status entry. Compiler-probe progress only; no linked `pythoncore`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution. Next frontier: fresh-confirm then isolate the `lookup_maybe_method()` `descrgetfunc local_get` declaration. No completed port is claimed.

---

## `find_name_in_mro()` loop-index `i` C89 declaration slice (frontier advances)

Date: 2026-10-25 UTC. The requested `/home/ubuntu/projects/python-win9x` path is absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read the current status, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md`. Preserved all existing dirty/untracked work; no reset, clean, stash, discard, commit, push, or publication. CPython baseline verified at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`. MSVC600 launcher/banner verified through Wine: `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86` (exit 0).

Forced-fresh pre-change probe command: `mkdir -p /home/ubuntu/r build/cron-20261025-current-reprobe; XDG_RUNTIME_DIR=/home/ubuntu/r WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261025-current-reprobe/probe.log 2>&1` — probe exit 2; `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First stable diagnostics at `cpython/Objects/typeobject.c(3865)`: C2143 for C99 `for (Py_ssize_t i...)` and C2065 undeclared `i`; later `typeobject.c` diagnostics are independent/later. Capture: `build/cron-20261025-current-reprobe/probe.log`.

Hermes coding delegation could not start because Anthropic credentials are unavailable. One authenticated Codex CLI 0.153.4 lane followed strict TDD. The focused pre-existing `scripts/vc6-typeobject-find-name-in-mro-c89.test.py` first failed because its expectation was stale: it placed `if` directly after `res`, while `n` was already hoisted. The lane repaired this fixture expectation and observed RED specifically on loop-local `i` before changing production code. It then hoisted only `Py_ssize_t i;` into `find_name_in_mro()`'s opening declarations and changed the loop initializer to `for (i = 0; ...)`; the directly coupled `scripts/vc6-typeobject-find-name-in-mro-n-c89.test.py` expectations were updated. Parent independently reran all 79 `scripts/vc6-typeobject-*.test.py`: 79 passed, 0 failed (exit 0). Outer and nested `git diff --check` passed (exit 0). Delegated hash verification reports only `cpython/Objects/typeobject.c`, the focused find-name fixture, and the coupled n fixture differ from the pre-lane snapshot; all other pre-existing modified/untracked files, including this status file before this entry, remained unchanged.

Forced-fresh after-change command: `mkdir -p /home/ubuntu/r build/cron-20261025-after-find-name-i; XDG_RUNTIME_DIR=/home/ubuntu/r WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261025-after-find-name-i/probe.log 2>&1` — probe exit 2; `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. Former diagnostics at `typeobject.c(3865)` cleared. First remaining diagnostic is `typeobject.c(3927)` C2143, followed by a distinct C2275/C2146/C2065 family at line 4024 (`descrgetfunc local_get`) and later declaration errors; these are untouched. Full capture: `build/cron-20261025-after-find-name-i/probe.log`.

Files changed by the implementation slice: `cpython/Objects/typeobject.c`, `scripts/vc6-typeobject-find-name-in-mro-c89.test.py`, `scripts/vc6-typeobject-find-name-in-mro-n-c89.test.py`, and this status record. This is compiler-probe progress only: no linked `pythoncore`/`python.exe`, Wine interpreter execution, or Windows 98 SE execution. Next: inspect and isolate the actual `typeobject.c(3927)` blocker after a fresh confirmation. No completed port is claimed.

---

## Diagnostics-only: recorded `find_name_in_mro()` state conflicts with checkout

Date: 2026-10-25 UTC. The requested `/home/ubuntu/projects/python-win9x` path is absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read this status, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved all pre-existing local state; no reset, clean, stash, discard, commit, push, or publication. CPython tag/commit verified as `v3.11.16`, `41388c9cb160d0886d5ca00d2e6c8782608a4549`; compiler launcher exists and prior recorded banner is MSVC 12.00.8804.

The requested `_blake2/blake2s_impl.c`-frontier condition is not current: forced-fresh command `mkdir -p /home/ubuntu/r build/cron-20261025-blake2-reprobe; XDG_RUNTIME_DIR=/home/ubuntu/r WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261025-blake2-reprobe/probe.log 2>&1` returned probe exit 2, summary `total=109 compiled=108 cached=0 skipped=0`; the first blocker is `cpython/Objects/typeobject.c`, with first diagnostic family at line 3865: C2143 on C99 `for (Py_ssize_t i...)`, undeclared `i` (C2065), and cascades. `_blake2/blake2s_impl.c` has local modifications and remains untouched. Full log: `build/cron-20261025-blake2-reprobe/probe.log`.

The recorded `find_name_in_mro()` mro/res fix is not reliably present in the checked-out source state: its existing focused regression `python3 scripts/vc6-typeobject-find-name-in-mro-c89.test.py cpython/Objects/typeobject.c` fails exit 1 at the opening-declaration assertion (also reports a Python invalid-escape SyntaxWarning). No production implementation was attempted because repository state is heavily dirty, source-list probe does not isolate the recorded target, and the fixture/source mismatch means the recorded frontier cannot safely be presumed. One 78-test loop attempt stopped at that first failing fixture; no full regression pass is claimed. Nested `git -C cpython diff --check -- Objects/blake2/blake2s_impl.c` and outer `git diff --check -- PORT_STATUS.md` both exit 0. No files outside this status record were changed by this run; probe output is an untracked build artifact.

Compiler-probe progress only. No `pythoncore`/`python.exe` link, Wine interpreter execution, or Windows 98 SE execution. Next: reconcile the existing `find_name_in_mro` fixture and local production diff against prior work without overwriting any of it; then establish a narrowly targeted forced-fresh probe for the actual typeobject frontier before choosing a single slice. No completed port is claimed.

---

## `find_name_in_mro()` `mro`/`res` C89 declaration slice (frontier advances)

Date: 2026-06-05 UTC. The requested `/home/ubuntu/projects/python-win9x` path is absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read this status, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before action. Preserved all pre-existing dirty/untracked work; no reset, clean, stash, discard, commit, push, or publication. CPython baseline remains tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`. VC6 launcher/banner: `wine cmd /c 'call Z:\\home\\ubuntu\\Organized\\Legacy-Ports\\Projects\\python-win9x\\MSVC600\\VC98\\Bin\\VCVARS32.BAT && cl'` — exit 0; `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

Forced-fresh pre-change command: `mkdir -p build/cron-20260605-frontier-reprobe; XDG_RUNTIME_DIR=/home/ubuntu/r WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20260605-frontier-reprobe/probe.log 2>&1` — exit 2; `_blake2/blake2s_impl.c` compiles. First stable diagnostic family in `typeobject.c(3842)` was C2275 `PyObject` / C2065 `mro`; next late `PyObject *res` at 3857 also failed, followed by separate `n`/`i` declarations at 3861–3862. Capture: `build/cron-20260605-frontier-reprobe/probe.log`.

One coding-agent workflow was attempted: Hermes delegation failed because Anthropic credentials are unavailable. Authenticated Codex CLI 0.153.4 was used for the single focused lane. Strict TDD: new `scripts/vc6-typeobject-find-name-in-mro-c89.test.py` failed before production edit (RED exit 1, assertion that `mro` and `res` must be declared at function entry); after the minimal change the test passed (exit 0). Only the `mro` and `res` declarations were hoisted into function-entry locals and their initializers moved to their original points. Parent independently ran all 78 `scripts/vc6-typeobject-*.test.py` files; 78 passed, 0 failed (exit 0). Nested production and outer new-test `git diff --check` passed (exit 0). Codex verified 278 pre-existing files preserved; reviewed full CPython diff and it includes extensive earlier local modifications, with this slice limited to `find_name_in_mro()` plus the focused new test.

Forced-fresh post-change command: `mkdir -p build/cron-20260605-after-find-name-in-mro; XDG_RUNTIME_DIR=/home/ubuntu/r WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20260605-after-find-name-in-mro/probe.log 2>&1` — exit 2. Former `mro`/`res` diagnostics cleared; first stable blocker advances to `typeobject.c(3863)` C2275/C2146/C2065 for `Py_ssize_t n`, followed by C99 loop-index `i` diagnostics at 3864. Left untouched. Capture: `build/cron-20260605-after-find-name-in-mro/probe.log`.

Files changed in this slice: `cpython/Objects/typeobject.c`, new `scripts/vc6-typeobject-find-name-in-mro-c89.test.py`, and this status record. Compiler-probe progress only: no linked `pythoncore`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution. Next frontier: fresh-confirm and isolate only the `n` declaration in `find_name_in_mro()`. No completed port is claimed.

---

## `PyType_GetModuleByDef()` `ht`/`module` C89 declaration slice (frontier advances)

Date: 2026-10-24 UTC. The requested `/home/ubuntu/projects/python-win9x` path is absent; worked in `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read `PORT_STATUS.md`, `README.md`, and the CPython Win9x/MSVC6 reference before action. Preserved all existing modified/untracked work; no reset, clean, stash, discard, commit, push, or publication. CPython baseline remains v3.11.16, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`; MSVC600 local bundle is present.

Forced-fresh pre-change command: `mkdir -p build/cron-20261024-followup/runtime; XDG_RUNTIME_DIR=/home/ubuntu/r WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261024-followup/probe.log 2>&1` — exit 2; summary `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. The recorded `PyType_GetModuleByDef()` frontier remained current: first stable errors at `typeobject.c(3807)` C2143 and `(3808)` C2275/C2065 for late `PyHeapTypeObject *ht` / `PyObject *module` declarations.

One authenticated Codex CLI 0.153.4 coding lane used strict TDD and preserved pre-existing state. New `scripts/vc6-typeobject-get-module-by-def-ht-module-c89.test.py` failed against unchanged source (RED exit 1, expected opening-declarations assertion). The minimal production change declares `ht` and `module` with existing function-entry locals and changes their initializers to assignments at the original point after the static-type skip. Directly coupled index, mro, and n fixtures were updated for the changed declarations/assignments. Focused regression passed (exit 0); parent independently reran all 77 `scripts/vc6-typeobject-*.test.py` tests (77 passed, 0 failed, exit 0). Both nested production and outer test `git diff --check` commands exited 0. Snapshot verification reported no unrelated pre-existing modified/untracked paths changed.

Forced-fresh after-change command: `mkdir -p build/cron-20261024-after-ht-module; XDG_RUNTIME_DIR=/home/ubuntu/r WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261024-after-ht-module/probe.log 2>&1` — exit 2; summary `total=109 compiled=108 cached=0 skipped=0`. The `ht`/`module` diagnostics cleared. First stable diagnostics now occur in `find_name_in_mro()` at `typeobject.c(3842)` (C2275 `PyObject`, C2065 `mro`), followed by `res` at 3857 and C99 `n`/`i` declarations at 3861–3862. These are a distinct next function/frontier and remain untouched. Full capture: `build/cron-20261024-after-ht-module/probe.log`.

Files changed in this slice: `cpython/Objects/typeobject.c`; new `scripts/vc6-typeobject-get-module-by-def-ht-module-c89.test.py`; updated `scripts/vc6-typeobject-get-module-by-def-index-c89.test.py`, `scripts/vc6-typeobject-get-module-by-def-mro-c89.test.py`, `scripts/vc6-typeobject-get-module-by-def-n-c89.test.py`; and this status record. Compiler-probe progress only: no linked `pythoncore`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution. Next frontier: fresh-confirm then isolate only the first C89 declaration family in `find_name_in_mro()`. No completed port is claimed.

---

## `PyType_GetModuleByDef()` loop-index `i` C89 declaration slice (frontier advances)

Date: 2026-10-24 UTC. Requested checkout `/home/ubuntu/projects/python-win9x` was absent; worked in `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read this status, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before work. Preserved existing dirty/untracked state; no reset, clean, stash, discard, commit, push, or publication. CPython baseline: tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`. Outer HEAD remains `35caf1a558e6b2c5bf501894d8972f8b0dd828a6`. VC6 launcher/banner check: `wine cmd /c 'call Z:\home\ubuntu\Organized\Legacy-Ports\Projects\python-win9x\MSVC600\VC98\Bin\VCVARS32.BAT && cl'` — exit 0; `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The status-recorded frontier was stale. Forced-fresh pre-change command: `mkdir -p build/cron-20261024-current-reprobe/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261024-current-reprobe/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261024-current-reprobe/probe.log 2>&1` — exit 2; `total=109 compiled=108 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First stable diagnostic family was `typeobject.c(3799)`: C2143 on the C99 `for (Py_ssize_t i = ...)` initializer and C2065 undeclared `i`; dependent loop/syntax errors followed. Capture: `build/cron-20261024-current-reprobe/probe.log`.

One authenticated Codex CLI 0.153.4 coding lane used strict TDD. New `scripts/vc6-typeobject-get-module-by-def-index-c89.test.py` failed before source edit (RED exit 1, expected assertion that `i` must be in the opening C89 locals). The sole production change in `cpython/Objects/typeobject.c` hoists `Py_ssize_t i;` alongside existing `mro` and `n` locals and changes the loop initializer to `i = 0`; loop bounds, increment, body, and evaluation order are otherwise unchanged. The existing `scripts/vc6-typeobject-get-module-by-def-mro-c89.test.py` and `scripts/vc6-typeobject-get-module-by-def-n-c89.test.py` fixtures were narrowly updated to include the added declaration and preserve the loop form. The focused new regression passed (exit 0); parent reran all 76 `scripts/vc6-typeobject-*.test.py` tests (76 passed, 0 failed; exit 0). Nested and outer scoped `git diff --check` passed (exit 0).

Forced-fresh post-change command: `mkdir -p /home/ubuntu/r build/cron-20261024-after-index; XDG_RUNTIME_DIR=/home/ubuntu/r WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261024-after-index/probe.log 2>&1` — exit 2; `total=109 compiled=108 cached=0 skipped=0`. The `i` diagnostics cleared. First stable diagnostics advance to `typeobject.c(3807)` C2143 before `type`, then line 3808 C2275 `PyObject` / C2065 `module` and `ht` in the separate late `PyHeapTypeObject *ht` / `PyObject *module` declarations; these were left untouched. Full capture: `build/cron-20261024-after-index/probe.log`. An initial delegated probe attempt used a repository-local XDG runtime and failed before compilation due Wine server lock/socket setup (exit 1); parent reran with `/home/ubuntu/r` and obtained the valid forced-fresh result above.

Files changed in this slice: `cpython/Objects/typeobject.c`; new `scripts/vc6-typeobject-get-module-by-def-index-c89.test.py`; updated `scripts/vc6-typeobject-get-module-by-def-mro-c89.test.py` and `scripts/vc6-typeobject-get-module-by-def-n-c89.test.py`; and this status entry. This is compiler-probe progress only: no linked `pythoncore`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution. Next frontier: fresh-confirm and isolate only the next `PyType_GetModuleByDef()` late declaration family at lines 3807–3808. No completed port is claimed.

---

## `PyType_GetModuleByDef()` `mro` C89 declaration slice (frontier advances)

Date: 2026-10-24 12:00 UTC. The requested checkout `/home/ubuntu/projects/python-win9x` is absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read this status, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before changes. Preserved pre-existing local work; no reset, clean, stash, discard, commit, push, or publication. CPython baseline: tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

Forced-fresh pre-change command: `mkdir -p build/cron-20261024-current-reprobe/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261024-current-reprobe/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261024-current-reprobe/probe.log 2>&1` — probe exit 2; summary `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. The `typeobject.c` first stable diagnostics were line 3788 C2143 before `type`, line 3790 C2065 `mro`, and then distinct later `n`/`i` errors at lines 3796–3797. Capture: `build/cron-20261024-current-reprobe/probe.log`.

One authenticated Codex CLI 0.153.4 coding lane followed strict TDD and preserved state. New `scripts/vc6-typeobject-get-module-by-def-mro-c89.test.py` failed against unchanged source (RED exit 1: `mro must be declared at function entry (C89)`); `cmp` confirmed source unchanged during RED. The only production edit declares `PyObject *mro;` before the assertion and assigns `mro = type->tp_mro;` at its original evaluation point. Focused test passed (exit 0); all 74 `scripts/vc6-typeobject-*.test.py` regressions passed (exit 0). Parent independently repeated both checks and scoped outer/nested `git diff --check` (all exit 0). Snapshot verification found all 273 other pre-existing modified/untracked files unchanged.

Forced-fresh after-change command: `mkdir -p build/cron-20261024-after-get-module-by-def-mro/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261024-after-get-module-by-def-mro/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261024-after-get-module-by-def-mro/probe.log 2>&1` — probe exit 2; summary unchanged `total=109 compiled=108 cached=0 skipped=0`. Former `mro` errors cleared. First stable blocker advances to line 3797 C2275 `Py_ssize_t`, C2146 before `n`, and C2065 `n`; the separate C99 loop initializer `i` at 3798 follows. Both untouched. Capture: `build/cron-20261024-after-get-module-by-def-mro/probe.log`.

Files changed by this slice: `cpython/Objects/typeobject.c`, new `scripts/vc6-typeobject-get-module-by-def-mro-c89.test.py`, and this status entry. Compiler-probe progress only: no linked `pythoncore`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution. Next frontier: fresh-confirm and isolate only the `Py_ssize_t n` declaration in `PyType_GetModuleByDef()`. No completed port is claimed.

---

## `PyType_GetModule()` `et` C89 declaration slice (frontier advances)

Date: 2026-10-24 09:48 UTC. Requested checkout `/home/ubuntu/projects/python-win9x` is absent; worked in `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read this status, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md`. Preserved all pre-existing dirty/untracked paths; no reset, clean, stash, discard, commit, push, or publication. CPython baseline: tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

Forced-fresh pre-change command: `mkdir -p build/cron-20261116-current-reprobe/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261116-current-reprobe/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261116-current-reprobe/probe.log 2>&1` — exit 2; summary `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First stable diagnostic family: `cpython/Objects/typeobject.c(3756)` C2275 `PyHeapTypeObject` and C2065 `et`; dependent C2223 diagnostics cascade in `PyType_GetModule()`. Capture: `build/cron-20261116-current-reprobe/probe.log`.

One focused authenticated Codex CLI lane (`codex-cli 0.153.4`, workspace-write/ephemeral) followed strict TDD and preserved all prior changes. New `scripts/vc6-typeobject-get-module-et-c89.test.py` failed against unchanged production source (RED exit 1, expected declaration-placement assertion). The only production change declares `PyHeapTypeObject *et;` at `PyType_GetModule()` entry and changes the original cast declaration into `et = (PyHeapTypeObject*)type;` at the same execution point. Focused test passed (exit 0); all 73 `scripts/vc6-typeobject-*.test.py` regressions passed (exit 0). `git -C cpython diff --check -- Objects/typeobject.c` passed (exit 0); check of the new untracked test emitted no whitespace diagnostics (git `--no-index` returned 1 because files differ).

Forced-fresh after-change command: `mkdir -p build/cron-20261116-after-get-module-et/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261116-after-get-module-et/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261116-after-get-module-et/probe.log 2>&1` — exit 2; summary remains `total=109 compiled=108 cached=0 skipped=0`. Former `PyType_GetModule()` diagnostics cleared. First remaining blocker advances to `PyType_GetModuleByDef()` at `typeobject.c(3788)`, C2143 before `type` and C2065 `mro`, followed by separate late `Py_ssize_t n` and loop-index errors at 3796–3797; untouched. Capture: `build/cron-20261116-after-get-module-et/probe.log`.

Files changed by this slice: `cpython/Objects/typeobject.c`, new `scripts/vc6-typeobject-get-module-et-c89.test.py`, and this status record. Compiler-probe progress only: no `pythoncore`/`python.exe` link, Wine interpreter execution, or real Windows 98 SE execution. Next frontier: fresh-confirm and isolate only the `PyType_GetModuleByDef()` `mro` declaration family. No completed port is claimed.

---

## `PyType_FromModuleAndSpec()` `memb` C89 loop declaration slice (frontier advances)

Date: 2026-10-23 22:51 UTC. The requested checkout `/home/ubuntu/projects/python-win9x` is absent; worked in `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read `PORT_STATUS.md`, `README.md`, and the active-profile CPython Win9x/MSVC6 reference before changes. Preserved existing modifications/untracked work; no reset, clean, stash, discard, commit, push, or publication. Baseline remains CPython tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

Forced-fresh pre-change compiler probe: `mkdir -p build/cron-20260603-reprobe/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20260603-reprobe/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20260603-reprobe/probe.log 2>&1` — exit 2; summary `total=109 compiled=108 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First stable diagnostic family: `cpython/Objects/typeobject.c(3452)` C2143 before `type`, then C2065 `memb`; subsequent member-access diagnostics cascade. Capture: `build/cron-20260603-reprobe/probe.log`.

Hermes delegation was unavailable because no Anthropic credentials were configured. One authenticated Codex CLI lane (`codex-cli 0.153.4`, workspace-write/ephemeral) performed the isolated implementation work with preservation checks. Strict TDD: new `scripts/vc6-typeobject-from-module-and-spec-memb-c89.test.py` failed against the unchanged production source at its declaration-placement assertion (RED, exit 1); the pre-edit `typeobject.c` snapshot comparison confirmed it was unchanged. The minimal production change declares `const PyMemberDef *memb;` at the start of the `Py_tp_members` block and changes the loop header to `for (memb = slot->pfunc; ...)`, keeping initialization/evaluation at the original loop point. No other behavior or fixture changed. Focused GREEN passed (exit 0); all 69 `scripts/vc6-typeobject-*.test.py` tests passed (exit 0). Delegated hash/snapshot verification reported all 268 other pre-existing dirty paths unchanged and the production delta exact. Scoped outer/nested `git diff --check` passed (exit 0).

Forced-fresh post-change probe command: `mkdir -p build/cron-20260603-after-memb/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20260603-after-memb/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20260603-after-memb/probe.log 2>&1` — exit 2; summary remains `total=109 compiled=108 cached=0 skipped=0`. Former line-3452 errors cleared. First remaining stable errors advance to `typeobject.c(3493)` C2143 before `const`, followed by C2065 `s`; this separate late `const char *s` declaration in `PyType_FromModuleAndSpec()` is untouched. Full capture: `build/cron-20260603-after-memb/probe.log`.

Files changed by this slice: `cpython/Objects/typeobject.c`, new `scripts/vc6-typeobject-from-module-and-spec-memb-c89.test.py`, and this status record. Compiler-frontier probe progress only: no linked `pythoncore`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution. Next frontier: fresh-confirm and isolate only the `PyType_FromModuleAndSpec()` `const char *s` declaration family at line 3493. No completed port is claimed.

---

## `type_vectorcall()` `tstate` C89 declaration slice (frontier advances)

Date: 2026-11-16 UTC. Requested checkout `/home/ubuntu/projects/python-win9x` is absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read this status, `README.md`, and the active-profile CPython Win9x/MSVC6 reference. Preserved all existing dirty/untracked changes; no reset, clean, stash, discard, commit, push, or publication. CPython baseline: v3.11.16, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

Forced-fresh pre-change command: `mkdir -p build/cron-20261116-frontier/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261116-frontier/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261116-frontier/probe.log 2>&1` — exit 2; summary `total=109 compiled=108 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First stable blocker: `cpython/Objects/typeobject.c(3409)`, C2275 `PyThreadState` and C2065 `tstate` in `type_vectorcall()`. Full capture: `build/cron-20261116-frontier/probe.log`.

Strict TDD via one authenticated Codex CLI fallback lane (Hermes delegation provider unavailable: Anthropic credentials missing). New `scripts/vc6-typeobject-type-vectorcall-tstate-c89.test.py` failed before production edit as expected (RED exit 1, missing opening declaration assertion). Hoisted only `PyThreadState *tstate;` to the opening declarations and retained `_PyThreadState_GET()` at the existing fallback execution point. The existing `scripts/vc6-typeobject-type-vectorcall-nargs-c89.test.py` required a narrow expectation update for that declaration placement. Focused regression passed; all 68 `scripts/vc6-typeobject-*.test.py` passed (exit 0); outer and nested `git diff --check` passed. The first full regression attempt had one stale fixture expectation (67 pass/1 fail); after the coupled expectation update the full run was clean.

Forced-fresh post-change command: `mkdir -p build/cron-20261116-after-tstate/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261116-after-tstate/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261116-after-tstate/probe.log 2>&1` — exit 2; summary `total=109 compiled=108 cached=0 skipped=0`. Former line-3409 C2275/C2065 errors cleared. Next stable blocker advances to `typeobject.c(3452)`: C2143 missing `;` before `type`, C2065 `memb`, followed by cascading member-access errors; left untouched. Full capture: `build/cron-20261116-after-tstate/probe.log`.

Files changed by this slice: `cpython/Objects/typeobject.c`, new `scripts/vc6-typeobject-type-vectorcall-tstate-c89.test.py`, adjusted `scripts/vc6-typeobject-type-vectorcall-nargs-c89.test.py`, and this status record. Compiler-probe progress only: no pythoncore/python.exe link, Wine interpreter execution, or real Windows 98 SE execution. Next: force-fresh confirm and isolate only the new `typeobject.c(3452)` declaration/initializer family. No completed port is claimed.

---

## `type_vectorcall()` `tstate` declaration frontier (diagnostics only)

Date: 2026-11-15 UTC. Requested checkout `/home/ubuntu/projects/python-win9x` is absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read `PORT_STATUS.md`, `README.md`, and the active-profile CPython Win9x/MSVC6 reference before work. Preserved all pre-existing dirty/untracked work; no reset, clean, stash, discard, commit, push, or publication. CPython baseline remains tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

Forced-fresh probe: `mkdir -p build/cron-20261115-frontier/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261115-frontier/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261115-frontier/probe.log 2>&1` — exit 2; summary `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. The first stable diagnostic is `cpython/Objects/typeobject.c(3407)`: C2275 `PyThreadState` and C2065 `tstate`, corresponding to `type_vectorcall()`'s late initialized `PyThreadState *tstate`. The old `type_new()` frontier is stale. Full capture: `build/cron-20261115-frontier/probe.log`.

The Hermes coding subagent could not start (Anthropic credentials unavailable). The authenticated Codex CLI fallback was launched in an ephemeral workspace-write lane, but its session/result was not retrieved in this run; no delegated changes are claimed as verified. Existing regressions: all 66 `scripts/vc6-typeobject-*.test.py` passed (exit 0); focused `scripts/vc6-typeobject-vectorcall-maybe-c89.test.py` passed (exit 0). `python3 -m pytest scripts/vc6-typeobject-*.test.py -q` could not run because pytest is not installed (exit 1). A broad `*vectorcall*` invocation initially failed four fixtures because they require source-path arguments; with one supplied path, three applicable vectorcall tests passed but the range-object fixture was given the wrong source path and failed. This was an invocation error, not an established product regression. `git -C cpython diff --check -- Objects/typeobject.c` exited 0. No source/test modifications by this run are confirmed; this status record and the forced probe log were written.

Compiler-probe progress only. No linked `pythoncore`/`python.exe`, Wine interpreter execution, or Windows 98 SE execution. Next: inspect/retrieve delegated lane outcome; if absent or no valid result, TDD only the `type_vectorcall()` `tstate` declaration placement, run targeted regressions and forced-fresh compiler probe. No completed port is claimed.

---

## `type_new()` `type`/`res` C89 declaration slice

Date: 2026-10-23 UTC. Requested checkout `/home/ubuntu/projects/python-win9x` is absent; worked in `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read `PORT_STATUS.md`, `README.md`, and the CPython Win9x/MSVC6 reference first. Preserved pre-existing dirty/untracked state; no reset, clean, stash, discard, commit, push, or publication. CPython baseline: tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

Forced-fresh pre-change command: `mkdir -p build/cron-20261023-recheck/runtime; XDG_RUNTIME_DIR=/home/ubuntu/.hermes/profiles/maxwell/cache/scratch/wine-runtime WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261023-recheck/probe.log 2>&1` — exit 2; summary `total=109 compiled=108 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First stable diagnostics at `typeobject.c(3373)` C2275 `PyObject` / C2065 `type`, then C2143 at 3374 and C2065 `res` at 3375; later separate `PyThreadState` diagnostics at 3405. Full capture: `build/cron-20261023-recheck/probe.log`.

One focused authenticated Codex CLI lane (`codex-cli 0.153.4`, workspace-write/ephemeral) followed TDD. New `scripts/vc6-typeobject-type-new-c89.test.py` failed before source edit as expected (RED exit 1, assertion that declarations must be in opening block). Hoisted only `PyObject *type` and `int res` into `type_new()` declarations; assignments remain at their original execution points. Narrowly updated directly coupled `type-new-args` and `type-new-ctx` fixture expectations. Focused test plus both coupled tests passed; all 66 `scripts/vc6-typeobject-*.test.py` passed (exit 0). Nested source `git diff --check` passed; outer check for three affected fixtures passed. Changes: `cpython/Objects/typeobject.c`, new `scripts/vc6-typeobject-type-new-c89.test.py`, and updated `scripts/vc6-typeobject-type-new-args-c89.test.py` / `scripts/vc6-typeobject-type-new-ctx-c89.test.py`.

Post-change VC6 probe was not run: `MSVC600/VC98/bin/VCVARS32.BAT` is absent. Thus no compiler progress is verified for this slice; no `pythoncore`/`python.exe` link, Wine interpreter run, or Windows 98 SE run. Next frontier remains the recorded type_new local declarations, including the later `PyThreadState *tstate` family, and requires restoring the local-only compiler bundle for actual post-change probe. No completed port is claimed.

---

## Diagnostics-only: `type`/`res` frontier reconfirmed; compiler bundle absent

Date: 2026-10-23 09:56 UTC. The requested checkout `/home/ubuntu/projects/python-win9x` is absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read `PORT_STATUS.md`, `README.md`, and the CPython Win9x/MSVC6 reference before acting. Preserved all existing dirty and untracked work; no reset, clean, stash, discard, commit, push, or publication. Baseline verified: CPython tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The current recorded frontier was re-probed forced-fresh. Command: `mkdir -p build/cron-20261109-frontier-reprobe/runtime; XDG_RUNTIME_DIR=/home/ubuntu/.hermes/profiles/maxwell/cache/scratch/wine-runtime WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261109-frontier-reprobe/probe.log 2>&1` — probe exit 2; summary `total=109 compiled=108 cached=0 skipped=0`. First stable errors reconfirmed at `cpython/Objects/typeobject.c(3373)`: C2275 `PyObject` and C2065 `type`; line 3374 C2143 before `type`; line 3375 C2065 `res`. The later `PyThreadState`/`tstate` errors at 3405 are a separate later family. Full capture: `build/cron-20261109-frontier-reprobe/probe.log`.

`MSVC600/VC98/bin/VCVARS32.BAT` remains absent (file check exit 1), so the actual VC6 compiler banner/probe cannot be executed and no source slice can be safely verified. No coding subagent, source edit, or regression edit was made; this run is diagnostics-only and not a TDD cycle. Files changed by this run: `PORT_STATUS.md` only; probe log is an untracked build artifact. Compiler-frontier probe progress only: no linked `pythoncore`/`python.exe`, Wine interpreter execution, or Windows 98 SE execution. Next frontier: restore the external local-only MSVC600 bundle, then add a RED placement regression and isolate only the `type`/`res` declaration family, run focused regressions, and force-fresh probe. No completed port is claimed.

---

## Diagnostics-only: current `type`/`res` frontier confirmed; VC6 bundle unavailable

Date: 2026-11-06 UTC. The requested checkout `/home/ubuntu/projects/python-win9x` is absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read `PORT_STATUS.md`, `README.md`, and the CPython Win9x/MSVC6 reference before acting. Preserved all existing local changes; no reset, clean, stash, discard, commit, push, or publication. CPython baseline verified at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

Forced-fresh command: `mkdir -p build/cron-20261106-refresh/runtime; XDG_RUNTIME_DIR=/home/ubuntu/.hermes/profiles/maxwell/cache/scratch/wine-runtime WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261106-refresh/probe.log 2>&1` — probe exit 2; `_blake2/blake2s_impl.c` compiled. First stable errors reconfirm at `cpython/Objects/typeobject.c(3373)`: C2275 `PyObject` / C2065 `type`, followed by line 3374 C2143 before `type` and line 3375 C2065 `res`. Later diagnostics include line 3405 `PyThreadState`/`tstate`; left untouched. Capture: `build/cron-20261106-refresh/probe.log`.

`MSVC600/VC98/bin/VCVARS32.BAT` is absent (check returned absent). Therefore no implementation slice could be safely verified with the required actual compiler, and no source/test was changed. The single Hermes coding-delegation attempt failed to start because the configured Anthropic provider has no credentials; no fallback coding CLI was invoked. Files changed by this run: `PORT_STATUS.md` only; the forced probe log is an untracked build artifact. This is diagnostics-only, not a TDD cycle. Compiler-probe progress only: no linked `pythoncore`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution occurred. Next frontier: restore the external local-only MSVC600 bundle, add a RED declaration-placement regression, then isolate only the `type`/`res` declarations at lines 3373–3375, run focused regressions, and force-fresh probe. No completed port is claimed.

---

## Diagnostics-only: `type_new()` context frontier advanced to `type`/`res`; VC6 bundle missing

Date: 2026-10-23 UTC. Requested `/home/ubuntu/projects/python-win9x` is absent; worked in `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read this status, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` first. Preserved all existing local modifications and untracked files; no reset, clean, stash, discard, commit, push, or publication. CPython baseline remains tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded `_blake2/blake2s_impl.c` frontier is stale. Forced-fresh probe command: `mkdir -p build/cron-current-20261106/runtime; XDG_RUNTIME_DIR=/home/ubuntu/.hermes/profiles/maxwell/cache/scratch/wine-runtime WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-current-20261106/probe.log 2>&1` — probe exit 2; summary `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First stable diagnostics now reconfirm at `cpython/Objects/typeobject.c(3373)`: C2275 `PyObject` and C2065 `type`; next line 3374 C2143 before `type`, then line 3375 C2065 `res`. Later independent errors include line 3405 `PyThreadState`/`tstate`; subsequent diagnostics are not part of this first blocker. Full capture: `build/cron-current-20261106/probe.log`.

The external compiler launcher `MSVC600/VC98/bin/VCVARS32.BAT` is absent (checked; exit 1), so no safe code slice with required post-edit VC6 verification was available. No coding subagent or source/test edit was made. Applicable regressions: all 65 `scripts/vc6-typeobject-*.test.py` scripts passed (exit 0); `git -C cpython diff --check -- Objects/typeobject.c` passed (exit 0). Files changed by this run: `PORT_STATUS.md` only; probe output is an untracked build artifact. Compiler-probe progress only: no linked `pythoncore`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution. Next frontier: restore the external MSVC600 compiler bundle, then add a RED declaration-placement regression and isolate only the `type`/`res` declarations at `typeobject.c(3373–3375)`, verify applicable regressions and force-fresh probe. No completed port is claimed.

---

## `type_new()` context declaration C89 slice (frontier advances)

Date: 2026-10-23 UTC. The requested checkout `/home/ubuntu/projects/python-win9x` is absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read `PORT_STATUS.md`, `README.md`, and `references/python-3-win9x-msvc6.md` before acting. Preserved pre-existing local modifications/untracked files; no reset, clean, stash, discard, commit, push, or publication. CPython baseline verified at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

Forced-fresh pre-change probe: `mkdir -p build/cron-20261106-frontier-reprobe/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261106-frontier-reprobe/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261106-frontier-reprobe/probe.log 2>&1` — exit 2; summary `total=109 compiled=108 cached=0 skipped=0`. First stable diagnostics at `cpython/Objects/typeobject.c(3365)`: C2275 `type_new_ctx`, C2146 before `ctx`, C2065 `ctx`, C2059 at `{`; subsequent member diagnostics cascade. The actual `MSVC600/VC98/bin/VCVARS32.BAT` launcher is absent, confirmed by file check (exit 1), so no coding delegation requiring compiler-backed confirmation was appropriate. One focused authenticated Codex CLI lane (`codex-cli 0.153.4`) followed strict TDD under workspace-write/ephemeral, with explicit preservation constraints.

RED: `python3 scripts/vc6-typeobject-type-new-ctx-c89.test.py` against unchanged production source exited 1 at the expected opening-declaration assertion. The old fixture only extracted the initializer and did not establish its placement. GREEN: hoisted only `type_new_ctx ctx;` into `type_new()`'s declaration block; replaced the original `{0}` initializer with `memset(&ctx, 0, sizeof(ctx));` at the original post-parse point, preserving zeroing and the existing field assignments' order. Updated the directly coupled argument-prefix fixture. Focused test passed, and all 65 `scripts/vc6-typeobject-*.test.py` scripts passed (exit 0). Snapshot check verified all 263 other pre-existing dirty/untracked files byte-identical, including `PORT_STATUS.md` before this record. `git -C cpython diff --check -- Objects/typeobject.c` exited 0.

Forced-fresh after-change probe: `mkdir -p build/cron-20261106-after-type-new-ctx/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261106-after-type-new-ctx/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261106-after-type-new-ctx/probe.log 2>&1` — exit 2; summary `total=109 compiled=108 cached=0 skipped=0`. The former line-3365 context declaration errors cleared; first remaining blocker advances to `typeobject.c(3373)` C2275 `PyObject` / C2065 `type`, followed by C2143/C2065 for `res` at 3374–3375. These distinct declarations remain untouched. Captures are in the two build directories. Compiler-probe progress only: no `pythoncore`/`python.exe` link, Wine interpreter execution, or real Windows 98 SE execution.

Files changed by this slice: `cpython/Objects/typeobject.c`; `scripts/vc6-typeobject-type-new-ctx-c89.test.py`; directly coupled `scripts/vc6-typeobject-type-new-args-c89.test.py`; and this status record. Next frontier: fresh-confirm and isolate the separate `type`/`res` declarations beginning at `typeobject.c(3373)`. No completed port is claimed.

---

## Diagnostics-only: `type_new_ctx` declaration frontier reconfirmed; VC6 bundle absent

Date: 2026-10-22 23:19 UTC. Requested checkout `/home/ubuntu/projects/python-win9x` is absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read this status, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md`. Preserved all pre-existing work; no reset, clean, stash, discard, commit, push, or publication. Baseline verified: CPython `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

Forced-fresh command: `mkdir -p build/cron-20261029-run-reprobe/runtime; XDG_RUNTIME_DIR=/home/ubuntu/.hermes/profiles/maxwell/cache/scratch/wine-runtime WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261029-run-reprobe/probe.log 2>&1` — exit 2; summary `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First stable diagnostics remain at `cpython/Objects/typeobject.c(3365)`: C2275 `type_new_ctx`, C2146 before `ctx`, C2065 `ctx`, and C2059 at `{`; following C2224 member errors cascade. Capture: `build/cron-20261029-run-reprobe/probe.log`. `MSVC600/VC98/bin/VCVARS32.BAT` remains absent (check exit 1), preventing safe compiler-backed implementation verification. No coding subagent or source/test changes were appropriate; this is diagnostics-only and not a TDD cycle. Files changed this run: `PORT_STATUS.md` only. Compiler-probe progress only; no linked `pythoncore`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution. Next frontier: restore the external local-only MSVC600 bundle, then test-first hoist only `type_new_ctx ctx` into the C89 declaration block, run focused regressions, and force-fresh probe. No completed port is claimed.

---

Date: 2026-10-29 UTC. The requested checkout `/home/ubuntu/projects/python-win9x` is absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read `PORT_STATUS.md`, `README.md`, and `references/python-3-win9x-msvc6.md` before acting. Preserved all existing changes; no reset, clean, stash, discard, commit, push, or publication. CPython remains tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded state was rechecked and remains current: forced-fresh command `mkdir -p build/cron-20261029-recheck/runtime; XDG_RUNTIME_DIR=/home/ubuntu/.hermes/profiles/maxwell/cache/scratch/wine-runtime WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261029-recheck/probe.log 2>&1` — probe exit 2; summary `total=109 compiled=108 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First stable errors reconfirm at `cpython/Objects/typeobject.c(3365)`: C2275 `type_new_ctx`, C2146 before `ctx`, C2065 `ctx`, and C2059 at `{`; following member-access errors cascade. Capture: `build/cron-20261029-recheck/probe.log`.

No implementation was safe: prerequisite `MSVC600/VC98/bin/VCVARS32.BAT` is absent in the working checkout. No test/code changes and no coding-agent delegation were made; this remains diagnostics-only, not a TDD cycle. Files changed by this run: `PORT_STATUS.md` only. Compiler-probe progress only; no `pythoncore`/`python.exe` link, Wine interpreter execution, or Windows 98 SE execution. Next frontier: restore the local external MSVC600 compiler bundle, then add a RED regression for hoisting `type_new_ctx ctx` into the C89 declaration block, implement only that placement fix, run focused regressions and a forced-fresh VC6 probe. No completed port is claimed.

---

Date: 2026-10-29 UTC. The requested checkout `/home/ubuntu/projects/python-win9x` does not exist; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read `PORT_STATUS.md`, `README.md`, and the CPython 3.11.16/MSVC6 reference at `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md`. Preserved all pre-existing changes and untracked files; no reset, clean, stash, discard, commit, push, or publication. CPython baseline verified: tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

Forced-fresh current-frontier probe: `mkdir -p build/cron-20261029-fresh-frontier; XDG_RUNTIME_DIR=/home/ubuntu/.hermes/profiles/maxwell/cache/scratch/wine-runtime WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261029-fresh-frontier/probe.log 2>&1` — exit 2; source-list run compiles 108 of 109 entries with zero cached/skipped, and `_blake2/blake2s_impl.c` compiled. First stable blocker reconfirms `cpython/Objects/typeobject.c(3365)`: C2275 `type_new_ctx`, C2146 before `ctx`, C2065 `ctx`, and C2059 at `{`; subsequent field errors are cascading. Full capture: `build/cron-20261029-fresh-frontier/probe.log`.

No implementation or regression test was changed. The prerequisite local compiler launcher `MSVC600/VC98/bin/VCVARS32.BAT` is absent (file check returned absent), so post-edit VC6 verification is unavailable in this workspace; did not delegate code changes that could not be independently checked against the actual compiler frontier. No test cycle was claimed. Files changed by this run: `PORT_STATUS.md` only. Compiler-probe progress only: no `pythoncore`/`python.exe` link, Wine interpreter execution, or real Windows 98 SE execution. Next frontier: once the external MSVC600 bundle/launcher is restored, add a focused RED test for placing `type_new_ctx ctx` in the declaration block, then make only that declaration-placement change, run its focused test and applicable regressions, and force-fresh probe again. No completed port is claimed.

---

## Diagnostics-only: `type_new_ctx` blocker reconfirmed; coding model unavailable

Date: 2026-10-22 UTC. The requested checkout `/home/ubuntu/projects/python-win9x` does not exist; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md`. Preserved the pre-existing dirty/untracked workspace (136 outer status entries); no reset, clean, stash, discard, commit, push, or publication. CPython remains tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

Forced-fresh probe command: `mkdir -p build/cron-20261022T-current-frontier-reprobe; XDG_RUNTIME_DIR=/home/ubuntu/.hermes/profiles/maxwell/cache/scratch/wine-runtime WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261022T-current-frontier-reprobe/probe.log 2>&1` — exit 2; summary `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First stable diagnostics reconfirm `cpython/Objects/typeobject.c(3365)`: C2275 `type_new_ctx`, C2146 before `ctx`, C2065 `ctx`, and C2059 at `{`; following field errors cascade. Capture: `build/cron-20261022T-current-frontier-reprobe/probe.log`.

The previously recorded `type_new_ctx` initializer issue is stale as a defect family: existing local code already uses `{0}` and explicit assignments; the current actual issue is the declaration occurring after statements. A single focused Codex lane was attempted but could not run because the selected model was at capacity (exit 1, per existing `build/codex-type-new-ctx.log`). The local VC6 bundle path `MSVC600/VC98/bin/VCVARS32.BAT` is also absent, so no coding delegation or implementation/test slice was safe. No source/test files changed.

Files changed this run: `PORT_STATUS.md` only. This is compiler-probe progress only; no `pythoncore`/`python.exe` link, Wine interpreter execution, or real Windows 98 SE execution. Next frontier: use a runnable coding lane to add a placement-focused RED test for `type_new_ctx ctx`, then narrowly hoist that declaration while leaving initialization/field assignments at their execution point. No completed port is claimed.

---

## Diagnostics-only: `type_new_ctx` frontier reconfirmed; coding lane blocked

Date: 2026-10-22 UTC. Requested checkout `/home/ubuntu/projects/python-win9x` is absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read `PORT_STATUS.md`, `README.md`, and the CPython 3.11.16/MSVC6 reference at `~/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md`. Preserved all pre-existing changes and untracked files. No reset, clean, stash, discard, commit, push, or publication. CPython baseline verified at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

Forced-fresh probe command: `mkdir -p build/cron-current-frontier-reprobe/runtime; XDG_RUNTIME_DIR=/home/ubuntu/.hermes/profiles/maxwell/cache/scratch/wine-runtime WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-current-frontier-reprobe/probe.log 2>&1` — exit 2; summary `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First stable blocker reconfirms `typeobject.c(3365)` designated initializer for `type_new_ctx ctx`, with C2275/C2146/C2065/C2059, followed by cascading diagnostics; later errors include C99 declarations. Capture: `build/cron-current-frontier-reprobe/probe.log`.

Coding-delegation prerequisites: `codex-cli 0.153.4`, authenticated (`codex login status` reported `Logged in using ChatGPT`); checkout already contained 136 dirty/untracked paths. One focused Codex CLI coding lane was attempted with strict-TDD instructions and exact scope, but stopped before edits because the selected model was at capacity (Codex exit 1; capture `build/codex-type-new-ctx.log`). No production code or tests changed in this run. This run therefore remains diagnostics-only; no test cycle was claimed.

Files changed by this run: this `PORT_STATUS.md` entry only. Compiler-probe progress only: no `pythoncore`/`python.exe` link, Wine interpreter execution, or real Windows 98 SE execution. Next frontier: inspect the `type_new_ctx` definition and isolate the designated initializer when a coding lane can execute. No completed port is claimed.

---

## `type_new()` argument local C89 declaration slice (frontier advances)

Date: 2026-10-21 UTC. The requested checkout `/home/ubuntu/projects/python-win9x` is absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read this status, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before work. Preserved all pre-existing dirty/untracked files; no reset, clean, stash, discard, commit, push, or publication. Nested CPython baseline remains tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

Forced-fresh pre-change VC6/Wine command: `mkdir -p build/cron-20261021-frontier-reprobe/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261021-frontier-reprobe/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261021-frontier-reprobe/probe.log 2>&1` — exit 2; summary `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First diagnostics were `typeobject.c(3355)` C2143 before `type`, then C2065 for `name`, `bases`, `orig_dict` at 3357–3359. Capture: `build/cron-20261021-frontier-reprobe/probe.log`.

Anthropic subagent delegation was unavailable (no credentials); one authenticated Codex CLI 0.153.4 fallback lane performed strict TDD. New `scripts/vc6-typeobject-type-new-args-c89.test.py` failed before the production edit (RED exit 1 at the expected declaration-placement assertion); source comparison confirmed the C file remained unchanged during RED. The only production change hoists `PyObject *name, *bases, *orig_dict;` into the opening declaration block of `type_new()`; argument assertions and `PyArg_ParseTuple` remain at their original execution point. Focused regression passed, and all 64 `scripts/vc6-typeobject-*.test.py` regressions passed individually. Snapshot verification reported 263 other pre-existing dirty/untracked files unchanged, including `PORT_STATUS.md` until this entry was added. Outer and nested `git diff --check` both exited 0.

Forced-fresh after-change command: `mkdir -p build/cron-20261021-after-type-new-args/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261021-after-type-new-args/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261021-after-type-new-args/probe.log 2>&1` — exit 2; summary remains `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. The former errors at 3355–3359 cleared. First stable blocker advances to the distinct `type_new_ctx ctx` C99 designated initializer at `typeobject.c(3365)` (C2275/C2146/C2065/C2059); later declarations also remain. Capture: `build/cron-20261021-after-type-new-args/probe.log`.

Files changed by this slice: `cpython/Objects/typeobject.c`, new `scripts/vc6-typeobject-type-new-args-c89.test.py`, and this status entry. Compiler-probe progress only: no pythoncore/python.exe link, Wine interpreter execution, or real Windows 98 SE execution occurred. Next frontier: separately evaluate and isolate the `type_new_ctx` designated initializer; untouched in this slice. No completed port is claimed.

---

## `type_new_get_bases()` `base` local C89 declaration slice (frontier advances)

Date: 2026-10-21 21:40 UTC. The requested checkout `/home/ubuntu/projects/python-win9x` is absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read this status, `README.md`, and the active-profile CPython Win9x/MSVC6 reference before work. Preserved all existing dirty and untracked files; no reset, clean, stash, discard, commit, push, or publication. CPython remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

Forced-fresh pre-change command: `mkdir -p build/cron-20261029-current-reprobe/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261029-current-reprobe/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261029-current-reprobe/probe.log 2>&1` — exit 2; summary `total=109 compiled=108 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First stable errors were `typeobject.c(3336)` C2275 `PyTypeObject` / C2065 `base` in `type_new_get_bases()`; following diagnostics begin at `type_new()` line 3354. Capture: `build/cron-20261029-current-reprobe/probe.log`.

Coding delegation was attempted once via Hermes but the configured Anthropic provider had no credentials. The authenticated Codex CLI fallback inspected the task and found the initial suggested function name was wrong: the actual line-3336 frontier is `type_new_get_bases()`, not `type_new_impl()`. That lane stopped without edits; resuming it was unavailable. Following the requested actual-frontier instruction, strict TDD was then performed in the parent workspace. New `scripts/vc6-typeobject-type-new-get-bases-base-c89.test.py` failed before the production edit (RED exit 1 at the expected opening-declaration assertion). The sole production change declares `PyTypeObject *base;` alongside the existing opening locals and changes the later initialized declaration to `base = best_base(ctx->bases);` at the same evaluation point. Directly affected `type_new_get_bases()` fixture expectations were narrowly updated in the existing index, new-bases, and winner regression scripts. Focused regression passed; all 63 `scripts/vc6-typeobject-*.test.py` scripts passed (0 failures). Outer `git diff --check` and nested `git -C cpython diff --check -- Objects/typeobject.c` passed (exit 0).

Forced-fresh after-change command: `mkdir -p build/cron-20261029-after-get-bases-base/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261029-after-get-bases-base/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261029-after-get-bases-base/probe.log 2>&1` — exit 2; summary remains `total=109 compiled=108 cached=0 skipped=0`. Former line-3336 C2275/C2065 errors are cleared. First stable diagnostic advances to `typeobject.c(3355)` C2143 (missing `;` before `type`) with related C2065 undeclared `name`, `bases`, and `orig_dict` at 3357–3359 in the following `type_new()` function; left untouched. Capture: `build/cron-20261029-after-get-bases-base/probe.log`.

Files changed by this slice: `cpython/Objects/typeobject.c`; new `scripts/vc6-typeobject-type-new-get-bases-base-c89.test.py`; narrowly adjusted `scripts/vc6-typeobject-type-new-get-bases-index-c89.test.py`, `scripts/vc6-typeobject-type-new-get-bases-new-bases-c89.test.py`, and `scripts/vc6-typeobject-type-new-get-bases-winner-c89.test.py`; and this status entry. This is compiler-probe progress only: no `pythoncore`/`python.exe` link, Wine interpreter execution, or real Windows 98 SE execution occurred. Next frontier: fresh-confirm and isolate only the `type_new()` `name`, `bases`, `orig_dict` declaration family beginning at line 3355. No completed port is claimed.

---

## `type_new_init()` C89 local declaration slice (frontier advances)

Date: 2026-10-28 UTC. Requested checkout `/home/ubuntu/projects/python-win9x` is absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read `PORT_STATUS.md`, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved all existing changes; no reset, clean, stash, discard, commit, push, or publication. CPython baseline verified: tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

Forced-fresh pre-change command: `mkdir -p build/cron-20261028-current-reprobe/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261028-current-reprobe/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261028-current-reprobe/probe.log 2>&1` — exit 2; summary `total=109 compiled=108 cached=0 skipped=0`. First stable errors: `typeobject.c(3219)` C2275/C2065 for initialized `PyTypeObject *type`; related C2223 at 3224; next declaration family at 3226 (`PyHeapTypeObject *et`). Capture: `build/cron-20261028-current-reprobe/probe.log`.

One focused authenticated Codex CLI lane (`codex-cli 0.153.4`, ephemeral workspace-write; no commit) followed TDD. New `scripts/vc6-typeobject-type-new-init-c89.test.py` first failed against unchanged source (RED exit 1, expected opening-declaration assertion; `cmp` verified unchanged `typeobject.c`). Minimal production edit hoisted only `PyTypeObject *type` and `PyHeapTypeObject *et` into the function's opening declarations and changed their later initialized declarations to assignments at the same execution points. Focused test passed (exit 0); all 58 `scripts/vc6-typeobject-*.test.py` tests passed individually (0 failures). Snapshot hash check confirmed only `cpython/Objects/typeobject.c` changed among existing paths and only the new focused regression was added; pre-existing dirty `PORT_STATUS.md` and all other pre-existing paths remained byte-identical during the coding lane. Outer and nested `git diff --check` both exited 0.

After-change forced-fresh command: `mkdir -p build/cron-20261028-after-type-new-init/runtime; XDG_RUNTIME_DIR=/home/ubuntu/.hermes/profiles/maxwell/cache/scratch/wine-runtime WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261028-after-type-new-init/probe.log 2>&1` — exit 2; summary remains `total=109 compiled=108 cached=0 skipped=0`. Former line-3219/3226 diagnostics cleared. First current stable diagnostics advance to `typeobject.c(3286)` C2275/C2065 for `PyObject *new_bases` in `type_new_impl()`; later C99 loop initializer at 3294 is separate and left untouched. The targeted source compiled with those later errors. Capture: `build/cron-20261028-after-type-new-init/probe.log`.

Files changed by this slice: `cpython/Objects/typeobject.c`, new `scripts/vc6-typeobject-type-new-init-c89.test.py`, and this entry in `PORT_STATUS.md`. Compiler-probe progress only; no `pythoncore`/`python.exe` link, Wine interpreter execution, or real Windows 98 SE execution occurred. Next frontier: force-fresh confirm and isolate only `type_new_impl()`'s `new_bases` declaration. No completed port is claimed.

---

## `type_new_get_slots()` `new_slots` declaration C89 slice (frontier advances)

Date: 2026-10-27 UTC. Requested checkout `/home/ubuntu/projects/python-win9x` is absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read `PORT_STATUS.md`, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md`. Preserved all existing modifications/untracked files; no reset, clean, stash, discard, commit, push, or publication. CPython baseline verified as tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The formerly recorded `typeobject.c(3025)` loop-index frontier had cleared. Forced-fresh pre-change probe command: `mkdir -p build/cron-20261027-current-reprobe/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261027-current-reprobe/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261027-current-reprobe/probe.log 2>&1` — exit 2; summary `total=109 compiled=108 cached=0 skipped=0`. Initial blocker was `cpython/Objects/typeobject.c(3185)` C2275 (`PyObject`) / C2065 (`new_slots`), in `type_new_get_slots()`. Log: `build/cron-20261027-current-reprobe/probe.log`.

Anthropic-backed delegation was unavailable (missing credentials); one authenticated Codex CLI 0.153.4 fallback lane followed TDD. New `scripts/vc6-typeobject-type-new-get-slots-new-slots-c89.test.py` first failed against unchanged C source (RED exit 1, expected opening-declaration assertion; `cmp` verified unchanged source). Minimal edit moves only `PyObject *new_slots;` from just before its first use to the opening declarations of `type_new_get_slots()`. No expressions or behavior changed. Focused GREEN passed (exit 0); all 57 `scripts/vc6-typeobject-*.test.py` tests passed (exit 0). Snapshot verification confirmed only `cpython/Objects/typeobject.c` and that new test changed; all 11,461 other pre-existing paths preserved byte/mode-identically. `git diff --check` and `git -C cpython diff --check -- Objects/typeobject.c` both exited 0.

Forced-fresh after-change probe: `mkdir -p build/cron-20261027-after-get-slots; XDG_RUNTIME_DIR=/home/ubuntu/.hermes/profiles/maxwell/cache/scratch/wine-runtime WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261027-after-get-slots/probe.log 2>&1` — exit 2; summary unchanged at `total=109 compiled=108 cached=0 skipped=0`. Former line-3185 errors cleared. First current errors are `typeobject.c(3219)` C2275 (`PyTypeObject`) and C2065 (`type`), with related C2223 at 3224; this distinct `type_new_slots_impl()` declaration family was left untouched. Capture: `build/cron-20261027-after-get-slots/probe.log`.

Files changed by this slice: `cpython/Objects/typeobject.c`, new `scripts/vc6-typeobject-type-new-get-slots-new-slots-c89.test.py`, and this status record. Compiler-probe progress only: no `pythoncore`/`python.exe` link, Wine interpreter execution, or real Windows 98 SE execution occurred. Next frontier: force-fresh confirm and isolate only `type_new_slots_impl()`'s `type` declaration. No completed port is claimed.

---

## `type_new_descriptors()` C89 loop-index slice (frontier advances)

Date: 2026-10-21 06:08 UTC. The requested checkout `/home/ubuntu/projects/python-win9x` is absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read `PORT_STATUS.md`, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved all pre-existing modified/untracked work; no reset, clean, stash, discard, commit, push, or publication. Nested CPython baseline verified as tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

A forced-fresh VC6/Wine probe verified the prior `type_new_classmethod()` frontier had cleared and `_blake2/blake2s_impl.c` compiled. First stable errors were at `cpython/Objects/typeobject.c(3025)`, C2143 on the C99 `for (Py_ssize_t i...)` initializer and dependent undeclared `i`/syntax diagnostics. Exact command: `mkdir -p build/cron-20261024-frontier-reprobe/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261024-frontier-reprobe/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261024-frontier-reprobe/probe.log 2>&1` — exit 2; summary `total=109 compiled=108 cached=0 skipped=0`. Capture: `build/cron-20261024-frontier-reprobe/probe.log`.

The Hermes coding subagent provider was unavailable (Anthropic credentials missing); one authenticated Codex CLI fallback lane (`codex-cli 0.153.4`) followed strict TDD. New `scripts/vc6-typeobject-type-new-descriptors-index-c89.test.py` failed against unchanged source (RED exit 1; expected opening-local assertion), and a byte comparison confirmed `cpython/Objects/typeobject.c` remained unchanged before implementation. The sole production edit hoists `Py_ssize_t i;` into `type_new_descriptors()`'s opening declarations and reuses it in the loop initializer, preserving the loop bounds, increment, body, and behavior. Focused GREEN passed (exit 0); all 56 `scripts/vc6-typeobject-*.test.py` regressions passed (exit 0). Preservation verification confirmed all 4,871 other snapshotted pre-existing paths byte-identical. Scoped nested and outer `git diff --check` both exited 0.

After-change forced-fresh command: `mkdir -p build/cron-20261024-after-type-new-descriptors/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261024-after-type-new-descriptors/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261024-after-type-new-descriptors/probe.log 2>&1` — exit 2; summary `total=109 compiled=108 cached=0 skipped=0`; the former line-3025 diagnostics cleared. First remaining stable blocker advances to `typeobject.c(3185)`, C2275 `PyObject` / C2065 `new_slots`, in `type_new_slots_impl()`; untouched. Subsequent diagnostics also remain untouched. Capture: `build/cron-20261024-after-type-new-descriptors/probe.log`.

Files changed by this slice: `cpython/Objects/typeobject.c`, new `scripts/vc6-typeobject-type-new-descriptors-index-c89.test.py`, and this status entry. This is compiler-probe progress only: no `pythoncore`/`python.exe` link, Wine interpreter execution, or real Windows 98 SE execution occurred. Next frontier: force-fresh confirm and isolate only `type_new_slots_impl()`'s `new_slots` declaration. No completed port is claimed.

---

## `type_new_staticmethod()` `static_func` C89 declaration slice (frontier advances)

Date: 2026-10-24 UTC. The requested checkout `/home/ubuntu/projects/python-win9x` is absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read `PORT_STATUS.md`, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved all existing modified and untracked work; no reset, clean, stash, discard, commit, push, or publication. CPython baseline verified as tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

One focused authenticated Codex CLI lane (`codex-cli 0.153.4`, workspace-write/ephemeral) followed strict TDD and did not edit this status file. Before implementation, all 53 existing `scripts/vc6-typeobject-*.test.py` fixtures passed. New `scripts/vc6-typeobject-type-new-staticmethod-c89.test.py` failed against unchanged source (RED exit 1; expected assertion that `static_func` must be in the opening declaration block; `cmp` verified the C file unchanged). Minimal production edit hoists `PyObject *static_func;` into `type_new_staticmethod()`'s initial local declarations and changes the later initialized declaration to assignment at the same call point. Focused test passed (exit 0); all 54 typeobject fixtures passed (exit 0). Delegated `diff -u` verified only that declaration/assignment delta in `cpython/Objects/typeobject.c`; outer `git diff --check` and nested `git -C cpython diff --check -- Objects/typeobject.c` both exited 0.

Forced-fresh pre-change VC6/Wine command: `mkdir -p build/cron-20261024-frontier/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261024-frontier/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261024-frontier/probe.log 2>&1` — exit 2; summary `total=109 compiled=108 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First stable errors were `typeobject.c(2973)` C2275 (`PyObject`) and C2065 (`static_func`). After-change forced-fresh command: `mkdir -p build/cron-20261024-after-staticmethod/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261024-after-staticmethod/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261024-after-staticmethod/probe.log 2>&1` — exit 2; same summary `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. The staticmethod diagnostics cleared. First remaining stable blocker is now `typeobject.c(3001)` C2275 (`PyObject`) and C2065 (`method`) in the following classmethod helper; left untouched. Full captures are in the two paths above.

Files changed by this slice: `cpython/Objects/typeobject.c`, new `scripts/vc6-typeobject-type-new-staticmethod-c89.test.py`, and this status entry. Compiler-probe progress only: no `pythoncore`/`python.exe` link, Wine interpreter execution, or real Windows 98 SE execution occurred. Next frontier: force-fresh confirm and isolate only the `type_new_classmethod()` `method` declaration. No completed port is claimed.

---

## `type_new_set_doc()` `tp_doc` C89 declaration slice (frontier advances)

Date: 2026-10-23 UTC. Requested checkout `/home/ubuntu/projects/python-win9x` is absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read `PORT_STATUS.md`, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved all pre-existing dirty/untracked changes; no reset, clean, stash, discard, commit, push, or publication. CPython baseline verified as tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

Forced-fresh before-change VC6/Wine probe command: `mkdir -p build/cron-20261023-reprobe/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261023-reprobe/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261023-reprobe/probe.log 2>&1` — exit 2; summary `total=109 compiled=108 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First diagnostics were `typeobject.c(2946)` C2143 (late `char *tp_doc`) and C2065 `tp_doc` at 2947. Capture: `build/cron-20261023-reprobe/probe.log`.

One focused Codex CLI lane (`codex-cli 0.153.4`, workspace-write/ephemeral) followed strict TDD and did not edit this status file. New `scripts/vc6-typeobject-type-new-set-doc-tp-doc-c89.test.py` failed against unchanged production source (RED exit 1, expected opening-declaration assertion). The minimal production change declares `char *tp_doc;` with opening locals and changes the later initialized declaration into `tp_doc = (char *)PyObject_Malloc(size);` at the same point, preserving allocation order/control flow. Initial regression run found two directly related fixtures expecting the old layout; narrowly updated only those expectations. First corrected full rerun still exposed a mistaken extra `size` token in the size fixture's normalized expectation; removed only that extra token, then reran cleanly. The focused test passed (exit 0); all 53 `scripts/vc6-typeobject-*.test.py` tests passed (exit 0). `git diff --check` and `git -C cpython diff --check -- Objects/typeobject.c` both exited 0. Baseline snapshot check from the coding lane confirmed the other 123 pre-existing outer-repository files were unchanged before the two necessary fixture updates; PORT_STATUS remained untouched until this record.

After-change forced-fresh probe: `mkdir -p build/cron-20261023-after-tp-doc/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261023-after-tp-doc/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261023-after-tp-doc/probe.log 2>&1` — exit 2; summary `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. Former `type_new_set_doc()` diagnostics at 2946/2947 cleared. First remaining stable errors are in the next function `type_new_staticmethod()` at `typeobject.c(2973)`, C2275 `PyObject` and C2065 `static_func`; left untouched. Capture: `build/cron-20261023-after-tp-doc/probe.log`.

Files changed by this slice: `cpython/Objects/typeobject.c`; new `scripts/vc6-typeobject-type-new-set-doc-tp-doc-c89.test.py`; narrowly updated `scripts/vc6-typeobject-type-new-set-doc-doc-str-c89.test.py` and `scripts/vc6-typeobject-type-new-set-doc-size-c89.test.py`; and this status entry. This is compiler-probe progress only: no pythoncore/python.exe link, Wine interpreter execution, or real Windows 98 SE execution occurred. Next frontier: force-fresh confirm, then isolate only `type_new_staticmethod()`'s `static_func` declaration family. No completed port is claimed.

---

## `type_new_set_doc()` size declaration C89 slice (frontier advances)

Date: 2026-10-20 UTC. The requested `/home/ubuntu/projects/python-win9x` checkout is absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read `PORT_STATUS.md`, `README.md`, and the CPython 3.11.16/MSVC6 legacy reference. Preserved prior local work; no reset, clean, stash, discard, commit, push, or publication. CPython baseline remains tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

A forced-fresh pre-change VC6/Wine probe disproved the older `_blake2/blake2s_impl.c` frontier: that source compiled. Exact command: `mkdir -p build/cron-20261023-reprobe/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261023-reprobe/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261023-reprobe/probe.log 2>&1` — exit 2; `total=109 compiled=108 cached=0 skipped=0`. First stable diagnostics were `typeobject.c(2944)` C2275/C2146/C2065 for late `Py_ssize_t size`; capture: `build/cron-20261023-reprobe/probe.log`.

One focused coding-delegation attempt stopped because the existing `doc_str` regression expected the late initialized `size` declaration. Strict TDD was maintained: new `scripts/vc6-typeobject-type-new-set-doc-size-c89.test.py` failed against unchanged production source (RED exit 1; expected missing opening declaration). Updated only the directly related `scripts/vc6-typeobject-type-new-set-doc-doc-str-c89.test.py` expectation to require the hoisted declaration and its same-point assignment, then changed only `cpython/Objects/typeobject.c`: added `Py_ssize_t size;` to `type_new_set_doc()`'s opening declarations and changed `Py_ssize_t size = strlen(doc_str) + 1;` to `size = strlen(doc_str) + 1;` at the original execution point. Initial post-edit regression run exposed the old test's expected body needing that same narrow update; after updating it, all 52 `scripts/vc6-typeobject-*.test.py` tests passed (exit 0), including both directly related tests. `git diff --check` and `git -C cpython diff --check -- Objects/typeobject.c` each exited 0.

After-change forced-fresh command: `mkdir -p build/cron-20261023-after-size/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261023-after-size/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261023-after-size/probe.log 2>&1` — exit 2; `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. Former `size` diagnostics cleared. First remaining stable diagnostic is `typeobject.c(2946)` C2143, followed by undeclared `tp_doc` at 2947: the later declaration `char *tp_doc` now follows the `size` assignment. Left untouched as a distinct declaration family. Capture: `build/cron-20261023-after-size/probe.log`.

Files changed by this slice: `cpython/Objects/typeobject.c`; new `scripts/vc6-typeobject-type-new-set-doc-size-c89.test.py`; narrowly updated `scripts/vc6-typeobject-type-new-set-doc-doc-str-c89.test.py`; and this status entry. This is compiler-probe progress only: no pythoncore/python.exe link, Wine interpreter execution, or real Windows 98 SE execution occurred. Next frontier: fresh confirm, then isolate only the `type_new_set_doc()` `tp_doc` declaration. No completed port is claimed.

---

## `type_new_set_doc()` doc_str C89 declaration slice (frontier advances)

Date: 2026-10-22 UTC. The requested checkout `/home/ubuntu/projects/python-win9x` is absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read this status, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved all existing dirty/untracked work; no reset, clean, stash, discard, commit, push, or publication. CPython baseline remains `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

Forced-fresh pre-change VC6/Wine probe command: `mkdir -p build/cron-20261022-reprobe/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261022-reprobe/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261022-reprobe/probe.log 2>&1` — exit 2; `_blake2/blake2s_impl.c` compiled. First stable diagnostics were `typeobject.c(2937)` C2143/C2065 for late `const char *doc_str`, with related declarations downstream. Exact capture: `build/cron-20261022-reprobe/probe.log`.

One focused authenticated Codex CLI lane (`codex-cli 0.153.4`, workspace-write/ephemeral) applied strict TDD. New `scripts/vc6-typeobject-type-new-set-doc-doc-str-c89.test.py` failed against unchanged source as expected (RED exit 1). The only production change hoists `const char *doc_str;` to `type_new_set_doc()`'s opening declarations and changes the later initialized declaration to assignment at the original conversion point. Focused GREEN passed; all 51 `scripts/vc6-typeobject-*.test.py` regressions passed (exit 0). Preservation verification confirmed all 121 pre-existing dirty/untracked paths byte-identical; only the intended production source and new test differ. `git diff --check` and `git -C cpython diff --check` both exited 0.

After-change forced-fresh command: `mkdir -p build/cron-20261022-after-doc-str/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261022-after-doc-str/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261022-after-doc-str/probe.log 2>&1` — exit 2. Former `doc_str` errors cleared; first diagnostics advance to `typeobject.c(2944)` C2275/C2146/C2065 for the distinct late `Py_ssize_t size` declaration in the same function; it remains untouched. Capture: `build/cron-20261022-after-doc-str/probe.log`. This is compiler-probe progress only: no pythoncore/python.exe link, Wine interpreter execution, or real Windows 98 SE execution occurred. Files changed by this slice: `cpython/Objects/typeobject.c`, new `scripts/vc6-typeobject-type-new-set-doc-doc-str-c89.test.py`, and this status entry. Next frontier: force-fresh confirm, then isolate only the `type_new_set_doc()` `size` declaration family. No completed port is claimed.

---

## Diagnostics-only: `type_new_set_module()` module local confirmed; regression fixture conflict

Date: 2026-10-21 UTC. Requested checkout `/home/ubuntu/projects/python-win9x` is absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read this status, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved existing work; no reset, clean, stash, discard, commit, push, or publication. Baseline remains CPython `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

Fresh forced VC6/Wine probe disproved the older `_blake2/blake2s_impl.c` frontier: `_blake2/blake2s_impl.c` compiled successfully and the first stable diagnostic family is `cpython/Objects/typeobject.c(2872)`, C2275 (`PyObject` illegal use as an expression) and C2065 (`module` undeclared), in `type_new_set_module()`. Exact command: `mkdir -p build/cron-20261021-refresh/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261021-refresh/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261021-refresh/probe.log 2>&1` — probe exit 2; summary `total=109 compiled=108 cached=0 skipped=0`. First diagnostic capture: `build/cron-20261021-refresh/probe.log` (first errors at log lines 1266/1268). Baseline tag and commit commands both verified the values above.

One focused coding lane was attempted: Hermes delegation was unavailable because the configured Anthropic provider has no credentials; authenticated `codex-cli 0.153.4` then inspected the target. It found the existing untracked regression `scripts/vc6-typeobject-type-new-set-module-globals-c89.test.py` asserts the entire function body including the separate late `module` declaration. The coding lane stopped before edits to preserve all pre-existing local work. No production code or tests changed; no TDD test was run, and the frontier was not advanced. This record is the only path changed by this run. Next action: a narrowly scoped strict-TDD slice may update that directly affected regression expectation together with a new/focused test and the `module` declaration, while preserving unrelated local changes; alternatively remain diagnostics-only if safe isolation cannot be guaranteed. Compiler-probe progress only: no pythoncore/python.exe link, Wine interpreter execution, or real Windows 98 SE execution occurred. No completed port is claimed.

---

## `type_new_set_module()` globals declaration C89 slice (frontier advances)

Date: 2026-10-21 UTC. Requested checkout `/home/ubuntu/projects/python-win9x` is absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read this status, `README.md`, and the legacy-toolchain CPython 3.11.16/MSVC6 reference before work. Preserved all pre-existing changes; no reset, clean, stash, discard, commit, push, or publication. Baseline remains CPython `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

Fresh pre-change forced VC6/Wine probe confirmed the recorded `type_new_set_module()` globals frontier. Command: `mkdir -p build/cron-20261021-frontier-reprobe/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261021-frontier-reprobe/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261021-frontier-reprobe/probe.log 2>&1` — exit 2; first stable diagnostics `typeobject.c(2866)` C2275/C2065 for late `PyObject *globals`; distinct `module` declaration diagnostics at 2871 follow.

One focused authenticated Codex CLI lane (`codex-cli 0.153.4`, workspace-write/ephemeral) followed strict TDD. New `scripts/vc6-typeobject-type-new-set-module-globals-c89.test.py` failed against unchanged source (RED exit 1, expected opening-declaration assertion). The sole production change hoists `PyObject *globals;` into the opening block and converts its later initialized declaration into assignment at the same evaluation point. The distinct `module` declaration and all control flow remain unchanged. Focused GREEN passed; all 49 `scripts/vc6-typeobject-*.test.py` regressions passed. Snapshot verification confirmed the exact source delta and all 4,864 other snapshotted pre-existing files unchanged. Outer and nested `git diff --check` both exited 0.

After-change forced-fresh command: `mkdir -p build/cron-20261021-after-globals/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261021-after-globals/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261021-after-globals/probe.log 2>&1` — exit 2. The former globals diagnostics cleared; first remaining diagnostic family advances to `typeobject.c(2872)` C2275/C2065 for the separate `PyObject *module` declaration, left untouched. Additional later diagnostics begin at line 2936. Probe output is captured in the two directories above. Compiler-probe progress only: no pythoncore/python.exe link, Wine interpreter execution, or real Windows 98 SE execution occurred.

Files changed by this slice: `cpython/Objects/typeobject.c`, new `scripts/vc6-typeobject-type-new-set-module-globals-c89.test.py`, and this status entry. Next frontier: force-fresh confirm and handle only the separate `module` declaration family. No completed port is claimed.

---

## Diagnostics-only: `type_new_set_module()` globals frontier confirmed; coding delegation unavailable

Date: 2026-10-20 UTC. Requested checkout `/home/ubuntu/projects/python-win9x` is absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read this status, `README.md`, and the active-profile CPython 3.11.16/Win9x/MSVC6 reference before acting. Preserved all existing modifications and untracked files; no reset, clean, stash, discard, commit, push, or publication. CPython baseline remains tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

Forced-fresh pre-change probe command: `mkdir -p /home/ubuntu/r build/cron-20261020-current-reprobe; XDG_RUNTIME_DIR=/home/ubuntu/r WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261020-current-reprobe/probe.log 2>&1` — probe exit 2; summary `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First stable diagnostics are `typeobject.c(2866)` C2275 (`PyObject` illegal use as expression) and C2065 (`globals` undeclared), then separate C2275/C2065 at line 2871 for `module`. Full capture: `build/cron-20261020-current-reprobe/probe.log`.

Attempted the required single focused coding-subagent lane, but delegation could not start: configured Anthropic provider has no credentials. Following the delegation fallback guidance, did not substitute an unrequested/unauthenticated external coding CLI. Consequently no implementation or tests were changed; do not treat the frontier as advanced. This run is diagnostics-only. No `pythoncore`/`python.exe` link, Wine interpreter execution, or real Windows 98 SE execution occurred. Files changed this run: `PORT_STATUS.md` only. Next frontier: strict-TDD fix only the `globals` declaration in `type_new_set_module()` when an approved coding lane is available; leave the separate `module` declaration untouched. No completed port is claimed.

---

## `type_new_alloc()` heap-type local C89 slice (frontier advances)

Date: 2026-10-20 06:08 UTC. The requested checkout `/home/ubuntu/projects/python-win9x` is absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read this status, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved all existing modified/untracked work; no reset, clean, stash, discard, commit, push, or publication. Baseline remains CPython `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded `type_new_alloc()` frontier was re-probed before changes. Exact command: `mkdir -p build/cron-20261020-reprobe/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261020-reprobe/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261020-reprobe/probe.log 2>&1` — exit 2; summary `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First stable errors: `typeobject.c(2802)` C2275 (`PyHeapTypeObject`) and C2065 (`et`), with subsequent C2223 consequences. Capture: `build/cron-20261020-reprobe/probe.log`.

One focused Codex CLI lane (`codex-cli 0.153.4`, workspace-write/ephemeral) followed strict TDD, preserving pre-existing changes and not editing this status file. New `scripts/vc6-typeobject-type-new-alloc-heap-type-c89.test.py` failed against unchanged production source (RED exit 1; expected opening-declaration assertion). The single production change declares `PyHeapTypeObject *et;` in the opening local block and assigns the cast to `et` at its original point after the `type == NULL` check, preserving allocation and validation order. Focused regression passed (exit 0); all 48 `scripts/vc6-typeobject-*.test.py` tests passed (suite exit 0). Independent snapshot/diff verification confirmed the complete source delta is just this declaration/assignment adjustment, the only new path is the focused test, and all 247 other pre-existing modified/untracked files remained byte-identical. Outer and nested `git diff --check` both exited 0.

After-change forced-fresh command: `mkdir -p build/cron-20261020-after-type-new-alloc/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261020-after-type-new-alloc/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261020-after-type-new-alloc/probe.log 2>&1` — exit 2; summary remains `total=109 compiled=108 cached=0 skipped=0`; `typeobject.c` compiled. The former line-2802 diagnostics are gone. First remaining stable errors advance to `typeobject.c(2866)` C2275/C2065 for late `PyObject *globals` in `type_new_set_module()`, then the distinct `module` declaration at 2871; both untouched. Capture: `build/cron-20261020-after-type-new-alloc/probe.log`. Wine emitted a long AF_UNIX socket-path warning because the repository-local runtime path exceeds 108 bytes; compilation continued through all 108 units and captured diagnostics. Compiler-probe progress only: no `pythoncore`/`python.exe` link, Wine interpreter execution, or real Windows 98 SE execution occurred.

Files changed by this slice: `cpython/Objects/typeobject.c`, new `scripts/vc6-typeobject-type-new-alloc-heap-type-c89.test.py`, and this status entry. Next frontier: isolate only `type_new_set_module()`'s first `globals` declaration at line 2866 after fresh confirmation. No completed port is claimed.

---

## `type_new_slots_impl()` C89 local declaration slice (frontier advances)

Date: 2026-10-20 UTC. Requested checkout `/home/ubuntu/projects/python-win9x` is absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read `PORT_STATUS.md`, `README.md`, and the active-profile CPython Win9x/MSVC6 reference before work. Preserved all pre-existing dirty/untracked work; no reset, clean, stash, discard, commit, push, or publication. The earlier recorded `_blake2/blake2s_impl.c` frontier was stale: forced-fresh probing compiled that file and first stopped at `type_new_slots_impl()` in `cpython/Objects/typeobject.c` line 2746, C2275 on late `PyObject *new_slots`. CPython baseline remains `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

One focused Codex CLI lane (`codex-cli 0.153.4`, workspace-write/ephemeral) used strict TDD. New `scripts/vc6-typeobject-type-new-slots-impl-c89.test.py` failed against unchanged source (RED exit 1, expected opening-declaration assertion); a byte comparison confirmed `cpython/Objects/typeobject.c` unchanged before implementation. The minimal source change hoists `PyObject *new_slots;` into the function's opening declaration block and changes the later initialized declaration to assignment at its original evaluation point. The focused test passed, and all 47 `scripts/vc6-typeobject-*.test.py` regressions passed (exit 0). The delegation snapshot check confirmed all 246 other pre-existing dirty/untracked files remained byte-identical. Nested and outer scoped `git diff --check` both exited 0.

Forced-fresh before-change command: `mkdir -p build/cron-run-frontier/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-run-frontier/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-run-frontier/probe.log 2>&1` — actual probe exit 2; summary `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First stable diagnostic: `typeobject.c(2746)` C2275 (`PyObject` illegal use as an expression). Capture: `build/cron-run-frontier/probe.log`.

After-change forced-fresh command: `mkdir -p build/cron-run-after-slots-impl/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-run-after-slots-impl/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-run-after-slots-impl/probe.log 2>&1` — actual probe exit 2; same summary `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. The line-2746 diagnostics are gone; first remaining blocker advances to `typeobject.c(2802)` C2275 (`PyHeapTypeObject`), left untouched. Capture: `build/cron-run-after-slots-impl/probe.log`. This is compiler-probe progress only: no `pythoncore`/`python.exe` link, Wine interpreter execution, or real Windows 98 SE execution occurred. Files changed by this slice: `cpython/Objects/typeobject.c`, new `scripts/vc6-typeobject-type-new-slots-impl-c89.test.py`, and this status record. Next frontier: force-fresh confirm and isolate only the current `typeobject.c(2802)` declaration family. No completed port is claimed.

---

## `type_new_slots_bases()` C89 loop-index slice (frontier advances)

Date: 2026-10-19 23:32 UTC. The requested checkout `/home/ubuntu/projects/python-win9x` is absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read `PORT_STATUS.md`, `README.md`, and the active-profile `python-3-win9x-msvc6.md` reference before acting. Preserved all existing outer and detached CPython work. No reset, clean, stash, discard, commit, push, or publication. CPython baseline remains tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The prior recorded `type_new_copy_slots()` frontier had already cleared. Forced-fresh VC6/Wine probe confirmed `_blake2/blake2s_impl.c` compiled and the first current blocker was `type_new_slots_bases()` line 2698: C2143 on the C99 `for (Py_ssize_t i = 0; ...)` declaration. The first attempted invocation did not run because its log directory had not been created (redirection exit 1); retried with the capture directory present. Successful pre-change command: `mkdir -p /home/ubuntu/r build/cron-20261019-fresh-frontier; XDG_RUNTIME_DIR=/home/ubuntu/r WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261019-fresh-frontier/probe.log 2>&1` — probe exit 2; summary `total=109 compiled=108 cached=0 skipped=0`. Capture: `build/cron-20261019-fresh-frontier/probe.log`.

One authenticated Codex CLI lane (`codex-cli 0.153.4`, workspace-write/ephemeral) followed strict TDD, without touching status or committing. New `scripts/vc6-typeobject-type-new-slots-bases-index-c89.test.py` failed against the unchanged production source (RED exit 1, expected assertion that the loop index must be declared before statements). The minimal source change declares `Py_ssize_t i;` after `nbases` and reuses it in `for (i = 0; ...)`, preserving bounds, body, and flow. Parent independently reran the focused regression (exit 0) and all 45 `scripts/vc6-typeobject-*.test.py` tests (exit 0). `git -C cpython diff --check -- Objects/typeobject.c` and a trailing-whitespace/newline check on the new test passed (exit 0). The delegated lane's `git diff --no-index --check` for the untracked test returned 1 because `--no-index` signals file difference; no whitespace diagnostics were emitted. Source comparison to its immediate pre-lane snapshot showed only the intended function-local C89 delta.

After-change forced-fresh command: `mkdir -p /home/ubuntu/r build/cron-20261019-after-slots-bases-index; XDG_RUNTIME_DIR=/home/ubuntu/r WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261019-after-slots-bases-index/probe.log 2>&1` — probe exit 2; same summary `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. Former line-2698 loop errors are gone. First remaining diagnostics are `typeobject.c(2705)` C2143 on the distinct `PyTypeObject *base` late declaration, then C2065 `base` at 2708 and consequent C2223 diagnostics at 2708/2713; left untouched. Capture: `build/cron-20261019-after-slots-bases-index/probe.log`.

Files changed by this slice: `cpython/Objects/typeobject.c`, new `scripts/vc6-typeobject-type-new-slots-bases-index-c89.test.py`, and this status entry. Compiler-probe progress only: no `pythoncore`/`python.exe` link, Wine interpreter execution, or real Windows 98 SE execution occurred. Next frontier: force-fresh confirm and isolate only the `type_new_slots_bases()` `base` declaration at line 2705. No completed port is claimed.

---

## `type_new_visit_slots()` C89 loop-index slice (frontier advances)

Date: 2026-10-19 UTC. Requested checkout `/home/ubuntu/projects/python-win9x` is absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read `PORT_STATUS.md`, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before work. Preserved all existing local changes. No reset, clean, stash, discard, commit, push, or publication. CPython baseline remains `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

Hermes coding delegation was unavailable (Anthropic credentials missing). One authenticated Codex CLI lane inspected the actual function and stopped without edits because it found no preexisting loop-index local to safely reuse. A fresh forced VC6/Wine probe reconfirmed the frontier at `type_new_visit_slots()` line 2583: C2143 on `for (Py_ssize_t i...)`, cascading C2065 `i`; `_blake2/blake2s_impl.c` compiled. Probe exit 2; summary `total=109 compiled=108 cached=0 skipped=0`. Capture: `build/cron-current-reprobe/probe.log`.

Implemented the narrow C89 fix directly under strict TDD. New regression `scripts/vc6-typeobject-type-new-visit-slots-index-c89.test.py` was created and run against unchanged production source (RED exit 1 at the expected missing function-scope `i` assertion). The minimal production edit declares `Py_ssize_t i;` with `type_new_visit_slots()` locals and changes only the loop initializer to `i = 0`, preserving bound, increment, body, and behavior. Focused regression passed (exit 0); all 43 `scripts/vc6-typeobject-*.test.py` tests passed (suite exit 0). Nested `git diff --check -- Objects/typeobject.c` and outer check for the new regression both exited 0.

After-change forced-fresh command: `mkdir -p build/cron-after-type-new-visit-slots/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-after-type-new-visit-slots/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-after-type-new-visit-slots/probe.log 2>&1` — exit 2; same summary `total=109 compiled=108 cached=0 skipped=0`. The former line-2583 errors are gone; first remaining error is `typeobject.c(2630)` C2275/C2146/C2065 for the distinct `Py_ssize_t j` declaration in `type_new_copy_slots()`, with a separate loop-index error there. Full capture: `build/cron-after-type-new-visit-slots/probe.log`. This is compiler-probe progress only: no `pythoncore`/`python.exe` link, Wine interpreter execution, or real Windows 98 SE execution. Files changed by this slice: `cpython/Objects/typeobject.c`, new `scripts/vc6-typeobject-type-new-visit-slots-index-c89.test.py`, and this status entry. Next frontier: force-fresh confirm and isolate only the `type_new_copy_slots()` line-2630 `j` declaration family. No completed port is claimed.

---

## `best_base()` `base_i` C89 declaration slice (frontier advances)

Date: 2026-10-19 UTC. The requested checkout `/home/ubuntu/projects/python-win9x` is absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read this status, `README.md`, and the profile CPython Win9x/MSVC6 reference before work. Preserved all pre-existing local changes; no reset, clean, stash, discard, commit, push, or publication. Baseline remains CPython `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

A forced-fresh pre-change VC6/Wine probe confirmed the status-recorded `base_i` frontier. Exact command: `mkdir -p build/cron-20261019-frontier-refresh/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261019-frontier-refresh/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261019-frontier-refresh/probe.log 2>&1` — probe exit 2; summary `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First stable errors were `typeobject.c(2226)` C2275 (`PyTypeObject`) and C2065 (`base_i`), followed by C2223 consequences at 2228/2235. Source inspection confirmed this declaration belongs to `best_base()`, not `mro_check()`.

Hermes coding delegation could not start because Anthropic credentials are unavailable. One authenticated Codex CLI lane (`codex-cli 0.153.4`, `codex exec --sandbox workspace-write --ephemeral`) applied strict TDD. New `scripts/vc6-typeobject-best-base-base-i-c89.test.py` failed against unchanged production source (RED exit 1, expected declaration-placement assertion); `cmp` against the pre-edit `typeobject.c` snapshot exited 0. The single production change declares `PyTypeObject *base_i;` at the beginning of the loop body and assigns the cast only after successful `PyType_Check(base_proto)`, preserving validation and cast timing. The focused test passed (exit 0); all 42 `scripts/vc6-typeobject-*.test.py` tests passed individually (suite exit 0). A SHA-256 preservation check confirmed that only `cpython/Objects/typeobject.c` and the new regression test differ from the pre-lane snapshot; every other existing file, including this status file, was byte-identical. Scoped nested and outer `git diff --check` both exited 0. No commit or publication.

After-change forced-fresh probe command: `mkdir -p build/cron-20261019-after-best-base/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261019-after-best-base/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261019-after-best-base/probe.log 2>&1` — probe exit 2; summary `total=109 compiled=108 cached=0 skipped=0`. The original `best_base()` errors at lines 2226/2228/2235 are gone; first remaining `typeobject.c` diagnostics are at line 2583 (C2143/C2065 loop-index family), followed by separate C89 declaration families at lines 2629 and beyond. The compiler capture also logs a too-long repository-local Wine socket path warning during some units, but completes 108 compilations and the `typeobject.c` diagnostics are reliable. Full capture: `build/cron-20261019-after-best-base/probe.log`. Compiler-probe progress only: no `pythoncore`/`python.exe` link, Wine interpreter execution, or real Windows 98 SE execution. Next frontier: force-fresh isolate the first line-2583 defect family. No completed port is claimed.

Files changed by this slice: `cpython/Objects/typeobject.c`, new `scripts/vc6-typeobject-best-base-base-i-c89.test.py`, and this status entry.

---

## Current frontier refreshed: `mro_check()` `base_i` declaration

Date: 2026-10-19 UTC. The requested checkout `/home/ubuntu/projects/python-win9x` does not exist; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Before diagnostics, read this status, `README.md`, and the profile CPython Win9x/MSVC6 reference. Preserved all pre-existing dirty/untracked work. No reset, clean, stash, discard, commit, push, or publication. CPython baseline verified as `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The previously recorded `mro_check()` `base_i` frontier remains current. Two forced-fresh VC6/Wine invocations ran with `VC6_FRONTIER_FORCE=1` and repository-local `XDG_RUNTIME_DIR`; both exited 2 during compilation. In both, `_blake2/blake2s_impl.c` had already compiled, and first stable diagnostics were `typeobject.c(2226)` C2275 (`PyTypeObject`) and C2065 (`base_i`), followed by C2223 consequences at lines 2228/2235. Captures: `build/cron-20261019-blake2-reprobe/probe.log` and `build/cron-20261019-basei-red/probe.log`. Summary in each: `total=109 compiled=108 cached=0 skipped=0`.

Implementation was not started in this run; no source or regression test was changed. The available compiler-probe frontier is precisely this C89 `base_i` declaration within `mro_check()`. Next action: one focused strict-TDD slice for `base_i` only, using the single-lane coding delegation workflow. Current state is compiler-probe progress only: there is no linked `pythoncore`/`python.exe`, no Wine interpreter execution, and no real Windows 98 SE execution. No completed port is claimed.

---

## `mro_check()` base local C89 slice (frontier advances)

Date: 2026-10-19 UTC. Requested checkout `/home/ubuntu/projects/python-win9x` was absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before work. Preserved all existing dirty/untracked work; no reset, clean, stash, discard, commit, push, or publication. CPython baseline remains `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

Forced-fresh pre-change command: `mkdir -p build/cron-20261019-mro-reprobe/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261019-mro-reprobe/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261019-mro-reprobe/probe.log 2>&1` — exit 2; summary `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First stable errors were `typeobject.c(2072)` C2275 (`PyTypeObject`) and C2065 (`base`), followed by C2223 at line 2078.

One focused Codex CLI coding lane (`codex-cli 0.153.4`, workspace-write/ephemeral) performed a strict-TDD slice after Hermes delegation was unavailable (Anthropic credentials absent). New `scripts/vc6-typeobject-mro-check-c89.test.py` failed against unchanged source as expected (RED exit 1), asserting that `base` must be declared before statements in the loop. The only production change declares `PyTypeObject *base;` before the type-check and assigns `(PyTypeObject*)obj` after successful `PyType_Check(obj)`, preserving cast/validation timing. Focused test passed; all 41 `scripts/vc6-typeobject-*.test.py` tests passed. Scoped nested and outer `git diff --check` passed. Preservation verification reports all 240 other pre-existing dirty/untracked files byte-identical; exact delta and checks are captured under `build/cron-20261019-after-mro-check/`.

After-change forced-fresh command: `mkdir -p build/cron-20261019-after-mro-check/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261019-after-mro-check/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261019-after-mro-check/probe.log 2>&1` — exit 2; summary remains `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. Former line-2072 errors are gone; first remaining diagnostics advance to `typeobject.c(2226)` C2275/C2065 for `base_i`, with C2223 consequences at lines 2228/2235. Full capture: `build/cron-20261019-after-mro-check/probe.log`. Compiler-probe progress only: no pythoncore/python.exe link, Wine interpreter run, or real Windows 98 SE execution. Files changed by the slice: `cpython/Objects/typeobject.c`, new `scripts/vc6-typeobject-mro-check-c89.test.py`, and this status entry. Next frontier: isolate only the verified `base_i` declaration family after fresh confirmation. No completed port is claimed.

---

## Diagnostics-only: recorded MRO frontier is stale; current first blocker is `mro_check()`

Date: 2026-10-19 UTC. The requested checkout `/home/ubuntu/projects/python-win9x` is absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read `PORT_STATUS.md`, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved all existing local work; no reset, clean, stash, discard, commit, push, or publication. CPython remains tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded `mro_implementation()` line-2072 frontier was not current: that line is now in `mro_check()`, and the declarations at `mro_implementation()` lines 1964 and 2015 are block-leading declarations, not the first current blocker. Existing fresh captures `build/cron-20261019-verify-frontier/probe.log` and `build/cron-20261019-after-result/probe.log` both showed the first stable diagnostic at `typeobject.c(2072)`, C2275 (`PyTypeObject`) and C2065 (`base`), followed by cascading C2223 at 2078. The requested coding delegation provider was unavailable (no Anthropic credentials); its authenticated Codex CLI fallback independently confirmed that the blocker is outside the requested function. No source or regression test was changed.

The exact proposed after-change probe command first failed before compilation with exit 1 due Wine socket setup (`sock_init: ERROR in sock_check_pollhup()`; wineserver lock creation returned read-only filesystem). Retried with a short repository-local runtime directory. Exact successful fresh diagnostic command: `mkdir -p build/cron-20261019-final-reprobe/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261019-final-reprobe/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261019-final-reprobe/probe.log 2>&1` — exit 2. The source-list frontier summary is `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First stable diagnostics remain `typeobject.c(2072)` C2275/C2065 for `PyTypeObject *base` in `mro_check()`, with downstream C2223; subsequent independent diagnostics include `typeobject.c(2225)`. Full capture: `build/cron-20261019-final-reprobe/probe.log`.

All 40 `scripts/vc6-typeobject-*.test.py` regressions passed individually (exit 0), captured in `build/codex-mro-diagnostics/typeobject-tests.log`. Preservation snapshot verified all 241 pre-existing modified/untracked files remained byte-identical before this status entry. Files changed by this run: this `PORT_STATUS.md` record only; no compatibility code or tests. Next step is a new narrowly scoped C89 slice for the actual `mro_check()` line-2072 declaration, after re-scoping task to that function; do not modify the unrelated `mro_implementation()` declarations. This remains compiler-probe progress only: no pythoncore/python.exe link, Wine interpreter execution, or real Windows 98 SE execution. No completed port is claimed.

---

## `mro_implementation()` slow-path result declaration C89 slice (frontier advances)

Date: 2026-10-19 UTC. The requested checkout `/home/ubuntu/projects/python-win9x` is absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read `PORT_STATUS.md`, `README.md`, and the active-profile reference `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved pre-existing work; no reset, clean, stash, discard, commit, push, or publication. CPython baseline verified unchanged: tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

Forced-fresh before-change VC6/Wine probe confirmed the prior population-loop index fix and identified `mro_implementation()` line 2019 `PyObject *result` declaration as the first stable blocker. Exact command: `mkdir -p build/cron-20261019-current-reprobe/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261019-current-reprobe/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261019-current-reprobe/probe.log 2>&1` — exit 2. `_blake2/blake2s_impl.c` compiled; initial diagnostic family was C2275/C2065 at line 2019 (`PyObject`/`result`). Full capture: `build/cron-20261019-current-reprobe/probe.log`.

One focused Codex CLI lane (`codex-cli 0.153.4`, `codex exec --sandbox workspace-write --ephemeral`) followed strict TDD. New `scripts/vc6-typeobject-mro-implementation-result-c89.test.py` failed against unchanged production source (RED exit 1, expected missing function-entry declaration assertion); the source remained unchanged before RED. The only production edit adds `PyObject *result;` to `mro_implementation()`'s opening declarations and changes the later initialized declaration to `result = PyList_New(1);` at its original evaluation point. The fast-path tuple allocation remains distinct and unchanged. The initial all-typeobject regression run exposed six tests asserting the prior declaration block; their fixtures were narrowly updated to include the new hoisted local and the updated allocation expression. Final focused test passed; all 40 `scripts/vc6-typeobject-*.test.py` tests passed (exit 0). Preservation verification confirmed exactly the intended source delta and all 239 other prior modified/untracked files byte-identical, including the prior contents of `PORT_STATUS.md`.

After-change forced-fresh probe: `mkdir -p build/cron-20261019-after-result/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261019-after-result/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261019-after-result/probe.log 2>&1` — exit 2. The line-2019 `result` diagnostics are gone; first remaining diagnostics advance to `typeobject.c(2072)` C2275 (`PyTypeObject`) and C2065 (`base`), with consequent C2223 at line 2078. Full capture: `build/cron-20261019-after-result/probe.log`. Scoped nested and outer `git diff --check` both exited 0. No `pythoncore`/`python.exe` link, Wine interpreter run, or real Windows 98 SE execution occurred; compiler-probe progress only.

Files changed in this slice: `cpython/Objects/typeobject.c`; new `scripts/vc6-typeobject-mro-implementation-result-c89.test.py`; narrowly adjusted six directly related MRO implementation tests (`bases`, `fast-path-index`, `index`, `merge-index`, `n`, and `to-merge`); and this status entry. Next frontier: force-fresh confirm, then isolate only the `typeobject.c(2072)` `base` declaration family. No completed port is claimed.

---

## `mro_implementation()` population-loop C89 index slice (frontier advances)

Date: 2026-10-19 UTC. The requested checkout `/home/ubuntu/projects/python-win9x` is absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved all existing dirty/untracked work; no reset, clean, stash, discard, commit, push, or publication. CPython baseline verified unchanged: tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The prior recorded frontier was force-fresh confirmed. Before-change command: `mkdir -p build/cron-current-reprobe/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-current-reprobe/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-current-reprobe/probe.log 2>&1` — exit 2. `_blake2/blake2s_impl.c` compiled; first stable diagnostic was `typeobject.c(2013)` C2143 on the C99 `for (Py_ssize_t i = 0; ...)` population-loop initializer. The pre-existing function-scope `i` permits reusing the index. One focused authenticated Codex CLI lane (`codex exec`, workspace-write/ephemeral; configured Anthropic delegation unavailable) followed strict TDD. New `scripts/vc6-typeobject-mro-implementation-population-index-c89.test.py` failed against unchanged production source (RED exit 1 with its expected loop-index assertion); `cmp` against the pre-edit `typeobject.c` snapshot exited 0. The sole production edit changes the loop initializer to `for (i = 0; ...)`, preserving loop bounds/body and initialization. All 39 `scripts/vc6-typeobject-*.test.py` tests passed (exit 0). A preservation check verified all 238 other pre-existing modified/untracked files unchanged and `typeobject.c` differs only by the intended one-line edit.

After-change forced-fresh probe: `mkdir -p build/cron-after-mro-population-index/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-after-mro-population-index/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-after-mro-population-index/probe.log 2>&1` — exit 2. `_blake2/blake2s_impl.c` compiled; former line-2013 C2143 is gone. First remaining stable diagnostics advance to `typeobject.c(2019)` C2275/C2065 for the separate `PyObject *result` declaration; untouched. Full capture: `build/cron-after-mro-population-index/probe.log`. `git -C cpython diff --check -- Objects/typeobject.c` and `git diff --check -- PORT_STATUS.md scripts/vc6-typeobject-mro-implementation-population-index-c89.test.py` exited 0.

Files changed by this slice: `cpython/Objects/typeobject.c`, new `scripts/vc6-typeobject-mro-implementation-population-index-c89.test.py`, and this status entry. Compiler-probe progress only: no `pythoncore`/`python.exe` link, Wine interpreter execution, or real Windows 98 SE execution occurred. Next frontier: force-fresh confirmation and isolate only the `typeobject.c(2019)` result declaration. No completed port is claimed.

---

## MRO implementation merge-loop index: fresh confirmation only; coding lane unavailable

Date: 2026-10-18 UTC. The requested checkout `/home/ubuntu/projects/python-win9x` is absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read this status, `README.md`, and searched for the specified CPython Win9x/MSVC6 reference; that file was unavailable in the workspace. Preserved all existing tracked modifications and untracked files. No reset, clean, stash, discard, commit, push, or publication. CPython remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded `to_merge` fix remains effective. A forced-fresh VC6/Wine probe compiled `_blake2/blake2s_impl.c` and advanced to the distinct C99 loop-index declaration at `typeobject.c(2013)` in `mro_implementation()`. Command: `mkdir -p build/cron-current-refresh/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-current-refresh/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-current-refresh/probe.log 2>&1` — exit 2; summary `total=109 compiled=108 cached=0 skipped=0`; first diagnostic family C2143 at line 2013, with cascading C2143/C2059; next independent error at line 2019 (`result`) left untouched. Full capture: `build/cron-current-refresh/probe.log`.

One focused implementation delegation was attempted but the configured Anthropic provider could not start due to missing credentials. The authenticated Codex CLI was started as the single fallback lane; it did not provide results during this run, so no production or test files were changed. Independently ran all 37 `scripts/vc6-typeobject-*.test.py` tests; all passed (exit 0). Nested `git diff --check -- Objects/typeobject.c` passed (exit 0).

Files changed this run: `PORT_STATUS.md` only. This is diagnostic progress; no `pythoncore`/`python.exe` link, Wine interpreter execution, or real Windows 98 SE execution occurred. Next frontier: strict-TDD isolated C89 fix for only the `mro_implementation()` line-2013 loop index, using the actual compiler evidence above. No completed port is claimed.

---

## `mro_implementation()` `to_merge` C89 declaration slice (frontier advances)

Date: 2026-10-18 UTC. The instructed checkout `/home/ubuntu/projects/python-win9x` is absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read this status, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before work. Preserved pre-existing dirty/untracked state; no reset, clean, stash, discard, commit, push, or publication. CPython baseline verified unchanged at `v3.11.16`, `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

Fresh forced probe confirmed the recorded `mro_implementation()` frontier: `_blake2/blake2s_impl.c` compiled; first stable errors were `typeobject.c(2006)` C2275/C2065/C2100 on late `PyObject **to_merge`. Before-change command: `mkdir -p build/cron-current-refresh/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-current-refresh/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-current-refresh/probe.log 2>&1` — probe exit 2, summary `total=109 compiled=108 cached=0 skipped=0`.

One focused Codex CLI implementation lane used strict TDD. New `scripts/vc6-typeobject-mro-implementation-to-merge-c89.test.py` failed against unchanged production source (RED exit 1; expected opening-declaration assertion). The only production change adds `PyObject **to_merge;` to the opening declaration block and turns its allocation declaration into assignment at its original point after duplicate validation. Allocation/error handling order is unchanged. Four existing focused MRO declaration tests required narrow expected-block updates for the additional hoisted local; their semantic assertions were retained. Focused test and all 37 `scripts/vc6-typeobject-*.test.py` regressions passed (exit 0). Applicable outer and nested `git diff --check` passed (exit 0).

After-change forced-fresh command: `mkdir -p build/cron-after-to-merge/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-after-to-merge/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-after-to-merge/probe.log 2>&1` — probe exit 2, same summary; the former line-2006 errors are gone. First remaining diagnostic is C2143 at `typeobject.c(2013)` for a separate C99 loop index, left untouched. Full capture: `build/cron-after-to-merge/probe.log`. No `pythoncore`/`python.exe` link, Wine interpreter execution, or real Windows 98 SE execution occurred; compiler-probe progress only.

Files changed by this slice: `cpython/Objects/typeobject.c`; new `scripts/vc6-typeobject-mro-implementation-to-merge-c89.test.py`; narrowly adjusted `scripts/vc6-typeobject-mro-implementation-bases-c89.test.py`, `scripts/vc6-typeobject-mro-implementation-fast-path-index-c89.test.py`, `scripts/vc6-typeobject-mro-implementation-index-c89.test.py`, and `scripts/vc6-typeobject-mro-implementation-n-c89.test.py`; and this status entry. Next frontier: force-fresh confirmation, then isolate only the `typeobject.c(2013)` loop-index family. No completed port is claimed.

---


Date: 2026-10-18 UTC. The requested checkout `/home/ubuntu/projects/python-win9x` does not exist; used the existing checkout `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read `PORT_STATUS.md`, `README.md`, and active-profile reference `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved pre-existing dirty/untracked state; no reset, clean, stash, discard, commit, push, or publication. CPython baseline remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

Fresh forced probe established the prior `_blake2/blake2s_impl.c` frontier had advanced: that file compiled, and the first current stable blocker was the second C99 loop-index declaration in `mro_implementation()` at `typeobject.c(1985)`, C2143. One focused Codex CLI implementation lane (`codex-cli 0.153.4`, authenticated ChatGPT, `--sandbox workspace-write --ephemeral`) followed strict TDD after Hermes delegation was unavailable (Anthropic credentials missing). New regression `scripts/vc6-typeobject-mro-implementation-fast-path-index-c89.test.py` failed against unchanged source (RED exit 1, expected C89 declaration assertion); `cmp` of `cpython/Objects/typeobject.c` against its pre-edit snapshot exited 0. The minimal production change reuses existing function-scope `i` in the single-base fast-path loop, preserving initialization timing, bounds, increment, and body. No other blocker was changed.

Exact verification:
- Baseline: `git -C cpython describe --tags --exact-match HEAD` → `v3.11.16`; `git -C cpython rev-parse HEAD` → `41388c9cb160d0886d5ca00d2e6c8782608a4549`.
- Before-change command: `mkdir -p build/cron-20261018-latest-reprobe/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261018-latest-reprobe/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261018-latest-reprobe/probe.log 2>&1` — exit 2; `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First compiler diagnostic: `typeobject.c(1985)` C2143 on the second loop-index declaration. Capture: `build/cron-20261018-latest-reprobe/probe.log`.
- TDD RED: new focused test before production edit — exit 1, expected assertion that fast-path loop must reuse function-scope `i`; source `cmp` against snapshot — exit 0.
- GREEN/regressions: focused test — exit 0. `for test in scripts/vc6-typeobject-*.test.py; do python3 "$test"; ...; done` — exit 0; all 36 typeobject tests passed.
- After-change forced-fresh command: `mkdir -p build/cron-20261018-after-mro-fast-index/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261018-after-mro-fast-index/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261018-after-mro-fast-index/probe.log 2>&1` — exit 2; same summary `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. Former line-1985 diagnostics are gone. First remaining diagnostic is `typeobject.c(2006)` C2275/C2065/C2100 on the separate `PyObject **to_merge` declaration; untouched. Capture: `build/cron-20261018-after-mro-fast-index/probe.log`.
- Preservation verification: SHA-256/mode snapshot confirmed exactly the production source and new focused regression changed; all 11,374 other pre-existing files remained byte-identical, including this status file, at implementation verification. No pythoncore/python.exe link, Wine interpreter execution, or real Windows 98 SE execution occurred; compiler-probe progress only.

Files changed by this slice: `cpython/Objects/typeobject.c` (one loop-index declaration removal/reuse), new `scripts/vc6-typeobject-mro-implementation-fast-path-index-c89.test.py`, and this status entry. Next frontier: force-fresh confirm, then isolate only the `to_merge` declaration at `typeobject.c(2006)`. No completed port is claimed.

---

## First mro_implementation loop-index C89 slice

Date: 2026-10-18 UTC. Used the existing checkout `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`; requested `/home/ubuntu/projects/python-win9x` does not exist. Read this status, `README.md`, and the active-profile `python-3-win9x-msvc6.md` reference. Preserved existing dirty/untracked work; no reset, clean, stash, discard, commit, push, or publication. Baseline remains CPython `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded MRO declaration frontier required fresh confirmation. The first attempt used an overly long project-local Wine runtime path and exited 2 before compiler diagnostics (`socket path ... exceeds 108 bytes`); the successful fresh retry used `XDG_RUNTIME_DIR="$PWD/build/r1/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/r1/probe.log 2>&1` and exited 2 at `mro_implementation()` line 1960: C2143 for the first C99 loop index declaration `for (Py_ssize_t i = 0; ...)`. `_blake2/blake2s_impl.c` passed; summary `total=109 compiled=108 cached=0 skipped=0`. A single authenticated Codex CLI lane (`codex-cli 0.153.4`, OpenAI) implemented only this frontier using strict TDD. New focused test was run against unchanged production source and failed as expected (RED exit 1); production byte comparison was unchanged (exit 0). The minimal source change hoisted `Py_ssize_t i;` to `mro_implementation()`'s opening declarations and retained `i = 0` in the original loop initializer. Existing declaration-order expectations in two directly related tests were narrowly updated. The focused test and all 35 `scripts/vc6-typeobject-*.test.py` regressions passed (exit 0). Snapshot verification covered 235 pre-existing modified/untracked files and passed; exact production delta was independently compared and passed. Root and nested `git diff --check` both returned 0. A supplementary `git diff --no-index --check /dev/null <new test>` returned 1 because `--no-index` signals the new-file difference despite empty diagnostics; do not interpret that as a whitespace failure.

After-change forced-fresh probe command: `mkdir -p build/r2/runtime; XDG_RUNTIME_DIR="$PWD/build/r2/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/r2/probe.log 2>&1` — exit 2, summary `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. Former line-1960 diagnostics are gone. First remaining stable diagnostic family advances to `mro_implementation()` line 1985, the second C99 loop-index declaration (`for (Py_ssize_t i = 0; i < k; i++)`); left untouched. Full capture: `build/r2/probe.log`.

Files changed by this slice: `cpython/Objects/typeobject.c`; new `scripts/vc6-typeobject-mro-implementation-index-c89.test.py`; narrowly updated `scripts/vc6-typeobject-mro-implementation-bases-c89.test.py` and `scripts/vc6-typeobject-mro-implementation-n-c89.test.py`; and this status entry. This is compiler-probe progress only: no pythoncore/python.exe link, Wine interpreter execution, or real Windows 98 SE execution occurred. Next frontier: force-fresh confirm, then isolate only the second `mro_implementation()` loop declaration at line 1985. No completed port is claimed.

---

## Diagnostics-only run: MRO declaration frontier confirmed; implementation delegation unavailable

Date: 2026-10-18 UTC. Used the existing checkout `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`; requested `/home/ubuntu/projects/python-win9x` does not exist. Read this status, `README.md`, and attempted the relevant legacy-toolchain reference lookup; `references/python-3-win9x-msvc6.md` was unavailable in the workspace. Preserved all existing dirty/untracked work. No reset, clean, stash, discard, commit, push, or publication. CPython remains tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The old `_blake2/blake2s_impl.c` frontier is not active: forced-fresh MSVC600/Wine probe compiled `_blake2/blake2s_impl.c` and advanced to `typeobject.c(1958)`. Probe command: `mkdir -p build/cron-20261018-current-reprobe/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261018-current-reprobe/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261018-current-reprobe/probe.log 2>&1` — exit 2; summary `total=109 compiled=108 cached=0 skipped=0`. First diagnostics: C2275/C2146/C2065 at line 1958 for late `Py_ssize_t n`; subsequent C2143/C2065/C2059 at line 1959 are the separate C99 loop index `i`. Additional later MRO errors remain untouched. Full capture: `build/cron-20261018-current-reprobe/probe.log`.

Attempted the required single focused coding delegation for only the first declaration family; delegation could not start because the configured Anthropic provider lacks credentials. No production or regression-test changes were made. Applicable regression diagnostics: all 33 `scripts/vc6-typeobject-*.test.py` passed (command loop exit 0). Baseline tag and commit rechecked unchanged. No pythoncore/python.exe link, Wine interpreter execution, or real Windows 98 SE execution occurred. Compiler-probe progress only.

Files changed this run: `PORT_STATUS.md` only; compiler capture is under `build/cron-20261018-current-reprobe/`. Next frontier: perform one strict-TDD slice for only the `typeobject.c(1958)` `n` declaration when an approved coding delegation provider is available; leave `i` and subsequent families separate. No completed port is claimed.

---

## vectorcall_maybe() C89 declaration slice (frontier advances)

Date: 2026-10-18 UTC. Existing checkout used: `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`; requested `/home/ubuntu/projects/python-win9x` does not exist. Read the status, README, and the legacy-toolchain reference lookup was attempted but the file was unavailable at both expected locations (`/home/ubuntu/.hermes/profiles/maxwell/skills/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` and workspace `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md`). Existing dirty/untracked work preserved. No reset, clean, stash, discard, commit, push, or publication. CPython baseline: `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

One focused authenticated Codex CLI lane (`codex-cli 0.153.4`, OpenAI, workspace-write/ephemeral) followed strict TDD. Fresh pre-edit forced probe reconfirmed `vectorcall_maybe()` as first stable frontier; `_blake2/blake2s_impl.c` compiled, followed by C2143 at `typeobject.c(1719)` and cascading declaration diagnostics. New focused test failed against unchanged production source (exit 1, expected opening declaration assertion). The only source change hoists `int unbound`, `self`, `func`, and `retval`; assignments remain at original evaluation points, and lookup failure control flow is unchanged. Focused GREEN and all 32 `scripts/vc6-typeobject-*.test.py` scripts passed (exit 0). The implementation lane independently compared the full `typeobject.c` against its pre-edit snapshot and confirmed its source delta is confined to this function.

Exact probe records:
- Before: `mkdir -p build/cron-20261018-reprobe-blake/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261018-reprobe-blake/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261018-reprobe-blake/probe.log 2>&1` — exit 2; `_blake2/blake2s_impl.c` compiled; first errors at `typeobject.c(1719)` C2143, then C2275/C2065 for declarations at 1720–1727. Capture: `build/cron-20261018-reprobe-blake/probe.log`.
- After: `mkdir -p build/cron-20261018-after-vectorcall-maybe/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261018-after-vectorcall-maybe/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261018-after-vectorcall-maybe/probe.log 2>&1` — exit 2; `_blake2/blake2s_impl.c` compiled; all prior `vectorcall_maybe()` diagnostics cleared. First remaining errors advance to `typeobject.c(1956)` in a separate MRO declaration family (`bases`, `n`, C99 loop index); untouched. Capture: `build/cron-20261018-after-vectorcall-maybe/probe.log`.

No `pythoncore`/`python.exe` link, Wine interpreter execution, or real Windows 98 SE test occurred. This is compiler-probe progress only. Files changed by this slice: `cpython/Objects/typeobject.c`, new `scripts/vc6-typeobject-vectorcall-maybe-c89.test.py`, and this status record. Next frontier: force-fresh confirm the first `typeobject.c(1956)` declaration family before selecting a single narrow follow-up. No completed port is claimed.

---

## vectorcall_method() C89 declaration slice (frontier advances)

Date: 2026-10-18 UTC. Baseline: CPython `v3.11.16` / `41388c9cb160d0886d5ca00d2e6c8782608a4549` (verified with `git -C cpython describe --tags --exact-match HEAD` and `git -C cpython rev-parse HEAD`, exit 0). Parent-reported before probe found first stable diagnostics at `typeobject.c` lines 1694+ (C2143 late declaration and cascade).

Strict TDD: added the focused script before changing source. `python3 scripts/vc6-typeobject-vectorcall-method-c89.test.py` returned exit 1 (RED), with `AssertionError: vectorcall_method: all locals must precede assert in the opening declaration block (C89)`. Hoisted only this function's local declarations; initializer assignments remain at their original evaluation points, preserving executable statement order and behavior. The same command then returned exit 0 (GREEN), output `vectorcall_method C89 declarations and unchanged assignment/evaluation/control flow: PASS`.

`for test in scripts/vc6-typeobject-*.test.py; do python3 "$test" || exit "$?"; done` returned exit 0; all 31 scripts passed (27 PASS output lines; four silent successes). Exact changed paths: `cpython/Objects/typeobject.c`, new `scripts/vc6-typeobject-vectorcall-method-c89.test.py`, and `PORT_STATUS.md` (this prepended record only). Post-slice forced-fresh probe command: `mkdir -p build/cron-20261018-after-vectorcall-method; XDG_RUNTIME_DIR=/home/ubuntu/r WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261018-after-vectorcall-method/probe.log 2>&1` — exit 2; `total=109 compiled=108 cached=0 skipped=0`, `_blake2/blake2s_impl.c` compiled. The prior `vectorcall_method()` diagnostics cleared; first blocker now advances to `vectorcall_maybe()` at `typeobject.c(1719)` C2143, with cascade through its late local declarations. Capture: `build/cron-20261018-after-vectorcall-method/probe.log`. No pythoncore/python.exe link, Wine interpreter execution, or Windows 98 SE runtime test occurred. This is compiler-probe progress only; no completed port is claimed.

---

## Latest verified slice (`subtype_dealloc()` GC-branch `type_needs_decref`; frontier advances)

Date: 2026-10-18 01:28 UTC

Used existing checkout `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`; requested `/home/ubuntu/projects/python-win9x` does not exist. Read `PORT_STATUS.md`, `README.md`, and the active-profile CPython Win9x/MSVC6 reference before work. Preserved all pre-existing outer and detached CPython changes; no reset, clean, stash, discard, commit, push, or publication. CPython baseline remains tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The prior non-GC `type_needs_decref` fix was force-fresh confirmed; the first diagnostics were the distinct GC-branch C2143 at `typeobject.c(1486)` and consequent C2065 at line 1496. One focused authenticated Codex CLI lane (`codex-cli 0.153.4`, `--sandbox workspace-write --ephemeral`) used strict TDD. New `scripts/vc6-typeobject-subtype-dealloc-gc-type-needs-decref-c89.test.py` failed against unchanged production source (exit 1) because the GC path's declaration remained after statements. The only production change hoists `int type_needs_decref;` to `subtype_dealloc()`'s opening declaration block and changes the GC-path initialized declaration to assignment at the same original evaluation point. The non-GC branch, evaluation order, and control flow are unchanged. The agent corrected a test fixture's escaped-backslash issue, reran RED against a saved pre-edit source, and verified GREEN. All pre-existing paths and this status file were preserved during the delegated lane.

Exact verification:

- Baseline: `git -C cpython describe --tags --exact-match HEAD` → `v3.11.16`; `git -C cpython rev-parse HEAD` → `41388c9cb160d0886d5ca00d2e6c8782608a4549`.
- Before-change forced-fresh command: `mkdir -p build/cron-20261018-gc-type-needs-decref-reprobe/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261018-gc-type-needs-decref-reprobe/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261018-gc-type-needs-decref-reprobe/probe.log 2>&1` — exit 2; summary `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First diagnostics: `typeobject.c(1486)` C2143 and `(1496)` C2065 `type_needs_decref`. Capture: `build/cron-20261018-gc-type-needs-decref-reprobe/probe.log`.
- TDD RED: focused regression against unchanged source — exit 1 on the expected missing function-entry declaration. GREEN: `python3 scripts/vc6-typeobject-subtype-dealloc-gc-type-needs-decref-c89.test.py` — exit 0.
- Regressions: `for test in scripts/vc6-typeobject-*.test.py; do python3 "$test" >/dev/null || exit 1; done` — exit 0; all 29 passed. Scoped `git -C cpython diff --check -- Objects/typeobject.c` and `git diff --check -- scripts/vc6-typeobject-subtype-dealloc-gc-type-needs-decref-c89.test.py` — exit 0. An independent exact-source comparison verified only the declaration addition and its assignment split; no other previously dirty path was altered by the implementation lane.
- After-change forced-fresh command: `mkdir -p build/cron-20261018-after-gc-type-needs-decref/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261018-after-gc-type-needs-decref/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261018-after-gc-type-needs-decref/probe.log 2>&1` — probe exit 2; summary `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. Both former GC-branch diagnostics are gone. First remaining diagnostic is `typeobject.c(1636)` C2275/C2146/C2065 for `descrgetfunc f`, a separate untouched declaration family. Capture: `build/cron-20261018-after-gc-type-needs-decref/probe.log`.
- No `pythoncore`/`python.exe` link, Wine interpreter execution, or real Windows 98 SE execution occurred; this is compiler-probe progress only.

Files changed by this slice: `cpython/Objects/typeobject.c`, new `scripts/vc6-typeobject-subtype-dealloc-gc-type-needs-decref-c89.test.py`, and this status entry. Next frontier: force-fresh confirm, then isolate only the first `typeobject.c(1636)` `descrgetfunc` declaration family. No completed port is claimed.

---

## Latest verified slice (`subtype_dealloc()` non-GC `type_needs_decref` declaration; frontier advances)

Date: 2026-10-18 UTC

Used existing checkout `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`; requested `/home/ubuntu/projects/python-win9x` does not exist. Read `PORT_STATUS.md`, `README.md`, and the active-profile CPython Win9x/MSVC6 reference first. Preserved all existing outer and detached CPython work; no reset, clean, stash, discard, commit, push, or publication. CPython baseline remains tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The prior `type_needs_decref` frontier was force-fresh confirmed: `_blake2/blake2s_impl.c` compiled, then VC6 reported C2143 at `typeobject.c(1359)` and a consequent C2065 at line 1372. The configured Hermes coding delegation could not start because Anthropic credentials are unavailable. Per the delegation workflow, the authenticated Codex CLI (`codex-cli 0.153.4`) handled one focused strict-TDD lane. New `scripts/vc6-typeobject-subtype-dealloc-type-needs-decref-c89.test.py` failed against unchanged production source (exit 1) on the expected non-GC block-entry declaration assertion. The only production change declares `int type_needs_decref;` at the start of the non-GC branch and changes the prior initialized declaration to assignment at its existing evaluation point. The separate GC-branch declaration and all control flow remain untouched. The focused regression and all 28 `scripts/vc6-typeobject-*.test.py` tests passed. Both repository diff checks passed. A hash comparison confirmed all 98 outer tracked-dirty/untracked files captured before work were unchanged; the nested source change was separately inspected and is limited to the intended declaration/assignment delta.

Exact verification:

- Baseline: `git -C cpython describe --tags --exact-match HEAD` → `v3.11.16`; `git -C cpython rev-parse HEAD` → `41388c9cb160d0886d5ca00d2e6c8782608a4549`.
- Before-change forced-fresh probe: `mkdir -p build/cron-20261018-current-reprobe/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261018-current-reprobe/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261018-current-reprobe/probe.log 2>&1` — probe exit 2; summary `total=109 compiled=108 cached=0 skipped=0`; first diagnostics `typeobject.c(1359)` C2143 and `(1372)` C2065 `type_needs_decref`; `_blake2/blake2s_impl.c` compiled.
- TDD RED: `python3 scripts/vc6-typeobject-subtype-dealloc-type-needs-decref-c89.test.py` before production edit — exit 1 with expected block-entry declaration assertion; `git diff --exit-code -- cpython/Objects/typeobject.c` — exit 0, confirming source unchanged during RED.
- GREEN/regressions: focused regression after edit — exit 0. `for test in scripts/vc6-typeobject-*.test.py; do python3 "$test" || exit "$?"; done` — exit 0; all 28 tests passed.
- After-change forced-fresh probe: `mkdir -p build/cron-20261018-after-type-needs-decref/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261018-after-type-needs-decref/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261018-after-type-needs-decref/probe.log 2>&1` — probe exit 2; summary `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. Both former non-GC branch errors are gone. Next first diagnostic is the separate GC-branch C2143 at `typeobject.c(1486)`, followed by C2065 `type_needs_decref` at line 1496; untouched. Full captures are in `build/cron-20261018-current-reprobe/probe.log` and `build/cron-20261018-after-type-needs-decref/probe.log`.
- `git diff --check -- PORT_STATUS.md scripts/vc6-typeobject-subtype-dealloc-type-needs-decref-c89.test.py` and `git -C cpython diff --check -- Objects/typeobject.c` — exit 0. No pythoncore/python.exe link, Wine interpreter execution, or real Windows 98 SE execution occurred; compiler-probe progress only.

Files changed by this slice: `cpython/Objects/typeobject.c`, new `scripts/vc6-typeobject-subtype-dealloc-type-needs-decref-c89.test.py`, and this status entry. Next frontier: force-fresh confirm, then isolate only the distinct GC-branch `type_needs_decref` declaration at line 1486. No completed port is claimed.

---

## Latest verified slice (`subtype_traverse()` managed-dict `err` declaration; frontier advances)

Date: 2026-10-18 UTC

Used existing checkout `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`; requested `/home/ubuntu/projects/python-win9x` does not exist. Read `PORT_STATUS.md`, `README.md`, and active-profile `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before changes. Preserved all prior local work; no reset, clean, stash, discard, commit, push, or publication. CPython baseline remains `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded `type_call()` frontier was stale. A forced-fresh probe confirmed the first stable error family at `typeobject.c(1235)` inside `subtype_traverse()`'s managed-dict branch: C2143 late declaration, then C2065 `err` at line 1236. One focused delegated implementation lane was attempted via the Hermes provider but could not start because Anthropic credentials are unavailable. The installed authenticated Codex CLI (`codex-cli 0.153.4`) completed one focused strict-TDD lane instead. New `scripts/vc6-typeobject-subtype-traverse-err-c89.test.py` was run against unchanged production source and failed on the expected missing function-entry declaration assertion (RED). The only production change hoists `int err;` into `subtype_traverse()`'s opening declarations and replaces the later initialized declaration with assignment at the same point after the existing assert. The separate `traverse_slots()` local `err`, evaluation point, error propagation, and control flow are preserved. The focused test and all 27 `scripts/vc6-typeobject-*.test.py` regressions passed. A byte-preservation check verified 226 other pre-existing dirty/untracked files were unchanged and `typeobject.c` contains exactly the requested source delta.

Exact verification:

- Baseline: `git -C cpython describe --tags --exact-match HEAD` → `v3.11.16`; `git -C cpython rev-parse HEAD` → `41388c9cb160d0886d5ca00d2e6c8782608a4549`.
- Before-change forced-fresh probe: `mkdir -p build/cron-20261018-reprobe/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261018-reprobe/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261018-reprobe/probe.log 2>&1` — probe exit 2; `total=109 compiled=108 cached=0 skipped=0`; first captured diagnostic `typeobject.c(1235)` C2143, followed by C2065 `err` at line 1236. `_blake2/blake2s_impl.c` compiled.
- TDD RED: `python3 scripts/vc6-typeobject-subtype-traverse-err-c89.test.py` before source edit — exit 1, expected function-entry declaration assertion. GREEN: same command after edit — exit 0.
- Regressions: `for test in scripts/vc6-typeobject-*.test.py; do python3 "$test" || exit "$?"; done` — exit 0; all 27 passed.
- After-change forced-fresh probe: `mkdir -p build/cron-20261018-after-subtype-traverse/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261018-after-subtype-traverse/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261018-after-subtype-traverse/probe.log 2>&1` — probe exit 2; `total=109 compiled=108 cached=0 skipped=0`; the former line-1235/1236 errors are gone. First remaining captured error is `typeobject.c(1359)` C2143, then line 1372 C2065 `type_needs_decref`; source family left untouched. Capture: `build/cron-20261018-after-subtype-traverse/probe.log`.
- `git -C cpython diff --check -- Objects/typeobject.c` and `git diff --check -- scripts/vc6-typeobject-subtype-traverse-err-c89.test.py` — exit 0. No pythoncore/python.exe link, Wine interpreter execution, or real Windows 98 SE execution occurred; compiler-probe progress only.

Files changed by this slice: `cpython/Objects/typeobject.c`, new `scripts/vc6-typeobject-subtype-traverse-err-c89.test.py`, and this status entry. Next frontier: force-fresh confirm before isolating only the `typeobject.c(1359)` declaration family (`type_needs_decref`); do not claim a completed port.

---

## Latest verified slice (`type_repr()` local declarations; frontier advances)

Date: 2026-10-17 14:22 UTC

Used the existing checkout `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`; the requested `/home/ubuntu/projects/python-win9x` path does not exist. Read `PORT_STATUS.md`, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before changes. Preserved all pre-existing outer and detached CPython changes. No reset, clean, stash, discard, commit, push, or publication. CPython baseline is tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The status-recorded `typeobject.c(1047)` frontier remained current under a forced-fresh VC6/Wine probe: `_blake2/blake2s_impl.c` compiled, then `type_repr()` failed on the late `PyObject *mod, *name, *rtn;` declaration. One focused Codex CLI lane (`codex-cli 0.153.4`, authenticated OpenAI, `--sandbox workspace-write --ephemeral`) followed TDD. It added the regression first, and observed the intended RED against unchanged production source. The only production change moves that declaration to the opening block before the `type->tp_name` guard; all assignments, evaluation order, and control flow remain unchanged. No other defect family was edited.

Exact verification:

- Baseline: `git -C cpython describe --tags --exact-match HEAD` → `v3.11.16`; `git -C cpython rev-parse HEAD` → `41388c9cb160d0886d5ca00d2e6c8782608a4549`.
- Before-change forced-fresh command: `mkdir -p build/cron-20261018-before-reprobe/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261018-before-reprobe/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261018-before-reprobe/probe.log 2>&1` — probe exit 2; summary `total=109 compiled=108 cached=0 skipped=0`; first stable diagnostic group at `typeobject.c(1047)` was C2275 `PyObject` illegal use as expression, C2065 `mod`/`name`/`rtn` undeclared, and C2100 illegal indirection. `_blake2/blake2s_impl.c` compiled. Capture: `build/cron-20261018-before-reprobe/probe.log`.
- TDD RED: `python3 scripts/vc6-typeobject-type-repr-c89.test.py` before production edit — exit 1, expected assertion `type_repr: PyObject *mod, *name, *rtn; must be in the opening declaration block`.
- TDD GREEN: same focused test after edit — exit 0, `type_repr locals C89 declaration and unchanged assignment/evaluation/control flow: PASS`. Applicable regression command `for test in scripts/vc6-typeobject-*.test.py; do python3 "$test" || exit "$?"; done` — exit 0; all 25 typeobject tests passed.
- After-change forced-fresh command: `mkdir -p build/cron-20261018-after-type-repr/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261018-after-type-repr/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261018-after-type-repr/probe.log 2>&1` — probe exit 2; summary remains `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. All former line-1047 diagnostics are gone. First remaining diagnostics: `typeobject.c(1090)` C2143 missing semicolon before `type`, then line 1092 C2065 `nargs` undeclared; left untouched. Capture: `build/cron-20261018-after-type-repr/probe.log`.
- `git -C cpython diff --check -- Objects/typeobject.c` and `git diff --check -- scripts/vc6-typeobject-type-repr-c89.test.py` — exit 0. Pre-existing changed/untracked path lists remained unchanged except the one intended new test; the already-modified `Objects/typeobject.c` retained its pre-existing status.
- Compiler-probe progress only. No pythoncore/python.exe link, Wine interpreter execution, or real Windows 98 SE execution occurred.

Files changed by this slice: `cpython/Objects/typeobject.c` (one declaration move); new `scripts/vc6-typeobject-type-repr-c89.test.py`; and this status entry. Next frontier: force-fresh confirm then isolate only the `type_call()` declaration at `typeobject.c(1090)`. Do not claim a completed port.

---

## Latest verified slice (`type_set_annotations()` result declaration; frontier advances)

Date: 2026-10-17 12:10 UTC

Used existing checkout `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`; requested `/home/ubuntu/projects/python-win9x` does not exist. Read this status, `README.md`, and the profile reference `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md`. Preserved all pre-existing outer and detached CPython changes; no reset, clean, stash, discard, commit, push, or publication. Baseline remains CPython tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The status-recorded `_PyType_Name()` frontier was stale. Forced-fresh VC6/Wine probing confirmed `_blake2/blake2s_impl.c` compiled, then the first stable diagnostic was `typeobject.c(972)` C2143, the late `int result;` declaration in `type_set_annotations()`. One focused authenticated Codex CLI lane (`codex-cli 0.153.4`, `workspace-write --ephemeral`) followed TDD. It added `scripts/vc6-typeobject-set-annotations-c89.test.py` and ran it before the production edit; RED exited 1 with the expected assertion that `result` must precede the immutable-type guard. The only production change moved `int result;` to the function's opening declaration block; executable statements, assignments, branches, and order were preserved. Its snapshot check confirmed existing changed/untracked paths were byte-identical other than this intended source edit.

Exact verification:

- Before-change forced-fresh probe: `mkdir -p build/cron-20261018-current-reprobe/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261018-current-reprobe/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261018-current-reprobe/probe.log 2>&1` — probe exit 2; `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First error at log line 1375: `cpython\\Objects\\typeobject.c(972) : error C2143: syntax error : missing ';' before 'type'`. Capture: `build/cron-20261018-current-reprobe/probe.log`.
- TDD RED: `python3 scripts/vc6-typeobject-set-annotations-c89.test.py` before production edit — exit 1, expected assertion `type_set_annotations: result must be declared before the immutable-type guard`.
- GREEN/regressions: focused test passed; all 24 `scripts/vc6-typeobject-*.test.py` scripts passed (overall exit 0). Outer `git diff --check -- PORT_STATUS.md scripts/vc6-typeobject-set-annotations-c89.test.py` and nested `git -C cpython diff --check -- Objects/typeobject.c` — exit 0.
- After-change forced-fresh probe: `mkdir -p build/cron-20261018-after-set-annotations/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261018-after-set-annotations/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261018-after-set-annotations/probe.log 2>&1` — probe exit 2; `total=109 compiled=108 cached=0 skipped=0`; the changed `typeobject.c` compiled through the former line-972 error. First remaining errors at line 1047 are C2275/C2065 for `PyObject`/`mod`/`name` and consequent C2100/C2065 for `rtn` in the next function; untouched. Capture: `build/cron-20261018-after-set-annotations/probe.log`.
- Compiler-probe progress only. No pythoncore/python.exe link, Wine interpreter execution, or real Windows 98 SE execution occurred.

Files changed by this slice: `cpython/Objects/typeobject.c`; new `scripts/vc6-typeobject-set-annotations-c89.test.py`; and this status entry. Next frontier: force-fresh confirm, then isolate only the first `typeobject.c(1047)` declaration family. No completed port is claimed.

---

## Previous verified slice (`type_get_annotations()` local declaration; frontier advances)

Date: 2026-10-17 09:57 UTC

Used the existing checkout `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`; requested `/home/ubuntu/projects/python-win9x` does not exist. Read `PORT_STATUS.md`, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md`. Preserved all existing outer and detached CPython changes; no reset, clean, stash, discard, commit, push, or publication. CPython remains at exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

One focused Codex CLI lane (`codex-cli 0.153.4`, authenticated OpenAI, `workspace-write --ephemeral`) followed TDD on the forced-fresh frontier. Before editing, the first stable diagnostics were `Objects/typeobject.c(937)` C2275 (`PyObject`) and C2065 (`annotations`) in `type_get_annotations()`. The source defect was a late local declaration after the heap-type guard. The only production edit moved `PyObject *annotations;` to the function's opening declaration position; all executable statements and their order remain unchanged. The focused regression checks the declaration placement and exact tokenized function body. An initial test implementation had a faulty whitespace assertion; its RED assertion failed for that test defect, was corrected, and the focused test was then rerun against unchanged production source to observe the expected RED.

Exact verification:

- Before-change forced-fresh probe: `mkdir -p build/cron-20261018-current-reprobe/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261018-current-reprobe/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261018-current-reprobe/probe.log 2>&1` — exit 2; summary `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First diagnostics: C2275/C2065 at `typeobject.c(937)` for `PyObject`/`annotations`. Capture: `build/cron-20261018-current-reprobe/probe.log`.
- TDD RED: `python3 scripts/vc6-typeobject-get-annotations-c89.test.py` against unchanged source — exit 1 with expected assertion `type_get_annotations: annotations must be declared before the heap-type guard`; `cmp cpython/Objects/typeobject.c /tmp/win9x-annotations-check/typeobject.before.c` — exit 0.
- GREEN and regressions: focused test — exit 0; all 23 `scripts/vc6-typeobject-*.test.py` scripts — exit 0. Preservation check verified 4,838 other baseline files byte-identical; prior entries in both repository statuses were retained. Scoped outer/nested `git diff --check` — exit 0.
- After-change forced-fresh probe: `mkdir -p build/cron-20261018-after-annotations/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261018-after-annotations/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261018-after-annotations/probe.log 2>&1` — exit 2; summary remains `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. Both former line-937 diagnostics are gone. Next first stable error is the distinct `typeobject.c(972)` C2143 missing-semicolon-before-type diagnostic, followed by C2065 `result` at line 975; untouched. Capture: `build/cron-20261018-after-annotations/probe.log`.
- No pythoncore/python.exe link, Wine interpreter execution, or real Windows 98 SE execution occurred. Compiler-probe progress only.

Files changed by this slice: `cpython/Objects/typeobject.c`; new `scripts/vc6-typeobject-get-annotations-c89.test.py`; and this status entry. Next frontier: force-fresh confirm, then isolate only the `type_set_annotations()` first diagnostic family. No completed port is claimed.

---

## Latest verified slice (`type_set_bases()` rollback loop index; frontier advances)

Date: 2026-10-18 UTC

Used existing checkout `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`; requested `/home/ubuntu/projects/python-win9x` does not exist. Read `PORT_STATUS.md`, `README.md`, and the profile reference `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` first. Preserved all pre-existing outer and detached CPython work. No reset, clean, stash, discard, commit, push, or publication. The earlier recorded `res` frontier was stale: forced-fresh probing showed its fix was already present and advanced the first stable blocker to the rollback-loop C99 `Py_ssize_t i` declaration at `typeobject.c(847)`. Baseline remains `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

One focused authenticated Codex CLI lane (`codex-cli 0.153.4`, OpenAI, workspace-write/ephemeral) followed TDD and preserved pre-existing changes. The new regression failed against unchanged production source, as expected. Since `type_set_bases()` already declares `Py_ssize_t i` at function scope, the sole production edit removes the redundant type from the rollback loop initializer, retaining reverse iteration, bounds, and restoration body. Regression covers rollback ordering and cleanup. A snapshot check confirmed all pre-existing file contents remain identical except the exact production line; only the requested regression test was added.

Exact commands/results:

- Before-change forced-fresh probe: `mkdir -p build/cron-20261018-current-reprobe/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261018-current-reprobe/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261018-current-reprobe/probe.log 2>&1` — exit 2; `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled; first error `typeobject.c(847)` C2143 on the C99 rollback-loop initializer. Capture: `build/cron-20261018-current-reprobe/probe.log`.
- TDD RED: `python3 scripts/vc6-typeobject-set-bases-rollback-index-c89.test.py` — exit 1, expected `C99 rollback loop index declaration remains`; `cmp cpython/Objects/typeobject.c /tmp/typeobject-rollback-before.c` — exit 0 confirming production source unchanged for RED.
- TDD GREEN and all applicable tests: focused regression — exit 0; all 22 `scripts/vc6-typeobject-*.test.py` scripts — exit 0. Snapshot preservation check — exit 0. Scoped outer and nested `git diff --check` — exit 0.
- After-change forced-fresh probe: `mkdir -p build/cron-20261018-after-rollback-index/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261018-after-rollback-index/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261018-after-rollback-index/probe.log 2>&1` — exit 2; `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. The rollback-loop diagnostic at line 847 is gone. First remaining error is `typeobject.c(937)` C2275: `'PyObject' : illegal use of this type as an expression`; distinct later blocker untouched. Capture: `build/cron-20261018-after-rollback-index/probe.log`.
- No pythoncore/python.exe link, Wine interpreter execution, or Windows 98 SE execution occurred; this is compiler-probe progress only.

Files changed by this slice: `cpython/Objects/typeobject.c`; new `scripts/vc6-typeobject-set-bases-rollback-index-c89.test.py`; and this status entry. Next frontier: force-fresh confirm, then isolate the `typeobject.c(937)` defect family only. No completed port is claimed.

---

## Previous verified slice (`type_set_bases()` `res` declaration; frontier advances)

Date: 2026-10-18 UTC

Used the existing checkout `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`; the requested `/home/ubuntu/projects/python-win9x` path does not exist. Read `PORT_STATUS.md`, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved all prior outer and detached CPython changes; no reset, clean, stash, discard, commit, push, or publication. CPython baseline remains tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

A forced-fresh MSVC600/Wine probe confirmed the recorded `type_set_bases()` `res` blocker. One focused authenticated Codex CLI coding lane (`codex-cli 0.153.4`, OpenAI, `--sandbox workspace-write --ephemeral`) followed TDD: added a focused regression and ran it against the unchanged source, observing the expected RED; then declared only `int res;` among the opening locals. Assignments, branches, and evaluation order were not changed. The child initially observed three existing declaration-fixture failures because they expected `if` immediately following the prior locals; narrowly updated those three directly affected expectations to account for `int res;`. No other production source changed.

Exact verification:

- Baseline: `git -C cpython describe --tags --exact-match HEAD` → `v3.11.16`; `git -C cpython rev-parse HEAD` → `41388c9cb160d0886d5ca00d2e6c8782608a4549`.
- Before-change forced-fresh command: `mkdir -p build/cron-20261018-current-reprobe/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261018-current-reprobe/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261018-current-reprobe/probe.log 2>&1` — probe exit 2; `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled; first diagnostic `typeobject.c(821) C2065: 'res' : undeclared identifier`. Capture: `build/cron-20261018-current-reprobe/probe.log`.
- TDD RED: `python3 scripts/vc6-typeobject-set-bases-res-c89.test.py` before production edit — exit 1, expected assertion `type_set_bases: res must be declared with the opening locals`.
- GREEN/regressions: focused test and all `scripts/vc6-typeobject-*.test.py` — exit 0; 21 scripts passed. Initial full-suite run caught three stale declaration expectations; they were narrowly updated, and the full suite then passed. Scoped `git diff --check` (status and four affected outer tests) and `git -C cpython diff --check -- Objects/typeobject.c` — exit 0.
- After-change forced-fresh command: `mkdir -p build/cron-20261018-after-res/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261018-after-res/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261018-after-res/probe.log 2>&1` — probe exit 2; `total=109 compiled=108 cached=0 skipped=0`; prior `res` undeclared error is gone. First remaining diagnostic advances to `typeobject.c(847)` C2143/C2059 for the distinct C99 rollback-loop index `for (Py_ssize_t i = n - 1; ...)`; left untouched. Capture: `build/cron-20261018-after-res/probe.log`.
- No pythoncore/python.exe link, Wine interpreter execution, or real Windows 98 SE execution occurred; this is compiler-probe progress only.

Files changed in this slice: `cpython/Objects/typeobject.c`; new `scripts/vc6-typeobject-set-bases-res-c89.test.py`; narrowly updated `scripts/vc6-typeobject-set-bases-index-c89.test.py`, `scripts/vc6-typeobject-set-bases-n-c89.test.py`, and `scripts/vc6-typeobject-set-bases-new-base-c89.test.py`; and this status entry. Next frontier: force-fresh confirm, then isolate only the rollback-loop C89 index declaration. No completed port is claimed.

---

## Previous verified slice (`type_set_bases()` `temp` declaration; frontier advances)

Date: 2026-10-17 UTC

Used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`; the requested `/home/ubuntu/projects/python-win9x` path does not exist. Read `PORT_STATUS.md`, `README.md`, and the applicable CPython Win9x/MSVC6 reference. Preserved the existing dirty/untracked outer and nested CPython work; no reset, clean, stash, discard, commit, push, or publication. The CPython baseline remains tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

A forced-fresh compiler probe confirmed the previous typeobject declaration sequence had moved on: `temp` was the first undeclared identifier in `type_set_bases()`. One focused Hermes coding delegation was attempted but did not start because Anthropic credentials are unavailable. Implemented just the confirmed local declaration under TDD; the assignment remains at its original point, after the existing base updates. Adjusted only the directly affected expectations for the already-hoisted locals in the related `set_bases` tests. No `res` or later defect family was changed.

Exact verification:

- Before probe command: `mkdir -p build/cron-20261017-current-reprobe/runtime && XDG_RUNTIME_DIR="$PWD/build/cron-20261017-current-reprobe/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261017-current-reprobe/probe.log 2>&1` — exit 2; summary `total=109 compiled=108 cached=0 skipped=0`; first diagnostic `typeobject.c(809) C2065: 'temp' : undeclared identifier`. `_blake2/blake2s_impl.c` compiled. Capture: `build/cron-20261017-current-reprobe/probe.log`.
- TDD RED: `python3 scripts/vc6-typeobject-set-bases-temp-c89.test.py` before source edit — exit 1 with the intended assertion that `temp` must be in the opening declarations.
- GREEN/regressions: focused test plus every `scripts/vc6-typeobject-*.test.py` — exit 0; all 20 typeobject scripts passed. Scoped `git diff --check` for edited outer tests and nested `Objects/typeobject.c` — exit 0.
- After probe command: `mkdir -p build/cron-20261017-after-temp/runtime && XDG_RUNTIME_DIR="$PWD/build/cron-20261017-after-temp/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261017-after-temp/probe.log 2>&1` — exit 2; summary `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled, former `temp` error removed, and first diagnostic is now `typeobject.c(821) C2065: 'res' : undeclared identifier`. `res` and all later blockers remain unchanged. Capture: `build/cron-20261017-after-temp/probe.log`.
- No pythoncore/python.exe link, Wine interpreter execution, or real Windows 98 SE execution occurred. This is compiler-probe progress only.

Files changed in this slice: `cpython/Objects/typeobject.c`; new `scripts/vc6-typeobject-set-bases-temp-c89.test.py`; narrowly updated expected declaration block in `scripts/vc6-typeobject-set-bases-index-c89.test.py`, `scripts/vc6-typeobject-set-bases-new-base-c89.test.py`, and `scripts/vc6-typeobject-set-bases-n-c89.test.py`; and this status entry. Next frontier: force-fresh confirm, then handle only `res` in `type_set_bases()` if still first. No completed port is claimed.

---

## Latest verified slice (`type_set_bases()` `old_bases` declaration; frontier advances)

Date: 2026-10-16 UTC

Used the existing checkout `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`; the requested `/home/ubuntu/projects/python-win9x` path does not exist. Read `PORT_STATUS.md`, `README.md`, and the profile legacy-toolchain reference. Preserved the extensive pre-existing dirty/untracked outer and detached CPython work; no reset, clean, stash, discard, commit, push, or publication. CPython baseline remains tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded `new_base` frontier had advanced. A forced-fresh probe compiled `_blake2/blake2s_impl.c`; the first errors were `typeobject.c(800)` C2275/C2065 for the late `PyObject *old_bases = type->tp_bases;`, followed by separate `old_base` and `temp` declaration errors. A focused Hermes coding delegation was attempted but could not start because Anthropic credentials are unavailable. Implemented only the confirmed old_bases declaration/assignment split under TDD: new `scripts/vc6-typeobject-set-bases-old-bases-c89.test.py` failed first (exit 1, intended opening-declaration assertion); source now declares `PyObject *old_bases;` with function locals and assigns `old_bases = type->tp_bases;` at its previous point immediately before its assertion. Evaluation and assertion order are unchanged. Directly affected existing type_set_bases expectation tests were adjusted to account for the new local. No `old_base`, `temp`, `res`, or other defect family was changed.

Exact verification:

- Before probe: `mkdir -p "$TMPDIR/cp311-cron-typeobject-before/runtime"; XDG_RUNTIME_DIR="$TMPDIR/cp311-cron-typeobject-before/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > "$TMPDIR/cp311-cron-typeobject-before/probe.log" 2>&1` — exit 2; `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled; first errors at `typeobject.c(800)` C2275/C2065 `old_bases`. Initial independent confirmation was captured at `build/cron-20261016-frontier-confirm/probe.log`.
- TDD RED: `python3 scripts/vc6-typeobject-set-bases-old-bases-c89.test.py` before production edit — exit 1 at expected missing declaration assertion.
- GREEN and applicable regressions: `python3 scripts/vc6-typeobject-set-bases-old-bases-c89.test.py` plus every `scripts/vc6-typeobject-*.test.py` — exit 0; 18 typeobject scripts passed. Scoped `git diff --check` in nested source and outer changed tests — exit 0.
- After probe: `mkdir -p build/cron-20261016-old-bases-after/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261016-old-bases-after/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261016-old-bases-after/probe.log 2>&1` — exit 2; `_blake2/blake2s_impl.c` compiled; former `old_bases` errors are gone. First current diagnostics are separate `old_base` undeclared at line 803 and `temp` undeclared at line 808, left untouched. Capture: `build/cron-20261016-old-bases-after/probe.log`.
- No pythoncore/python.exe link, Wine interpreter execution, or real Windows 98 SE execution occurred. This is compiler-probe progress only.

Files changed by this slice: `cpython/Objects/typeobject.c`; new `scripts/vc6-typeobject-set-bases-old-bases-c89.test.py`; directly affected expectations in `scripts/vc6-typeobject-set-bases-index-c89.test.py`, `scripts/vc6-typeobject-set-bases-n-c89.test.py`, and `scripts/vc6-typeobject-set-bases-new-base-c89.test.py`; and this status entry. Next frontier: force-fresh confirm and handle only `old_base` if still first. No completed port is claimed.

---



Date: 2026-10-16 16:21 UTC

Used the existing checkout at `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`; the requested `/home/ubuntu/projects/python-win9x` path does not exist. Read `README.md`, this status, and the CPython 3.11.16/MSVC6 reference under the active profile. Preserved all pre-existing dirty/untracked work; no reset, clean, stash, discard, commit, push, or publication. CPython baseline remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The status-recorded frontier had advanced; before editing a forced-fresh VC6 probe confirmed `_blake2/blake2s_impl.c` compiled and the first diagnostic was `typeobject.c(769)` C2275/C2065 for the late `PyTypeObject *base` declaration in `type_set_bases()`. A focused Hermes coding-subagent could not start because the configured Anthropic provider has no credentials. The installed authenticated Codex CLI (`codex-cli 0.153.4`) performed one narrow implementation lane under TDD. New `scripts/vc6-typeobject-set-bases-base-c89.test.py` failed before the production edit on the intended missing loop-opening declaration. The sole production change declares `base` at the top of the loop body and assigns `(PyTypeObject*)ob` only after the existing `PyType_Check(ob)` validation; item retrieval, validation, cast timing, and subsequent checks remain ordered as before. No other production defect family changed.

Exact verification:

- Before-change forced-fresh command: `mkdir -p "$TMPDIR/cp311-cron-current-frontier/runtime"; XDG_RUNTIME_DIR="$TMPDIR/cp311-cron-current-frontier/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > "$TMPDIR/cp311-cron-current-frontier/probe.log" 2>&1` — exit 2; summary `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First compiler errors: `typeobject.c(769)` C2275/C2065 on `PyTypeObject *base`. Capture: `$TMPDIR/cp311-cron-current-frontier/probe.log`.
- TDD RED: `python3 scripts/vc6-typeobject-set-bases-base-c89.test.py` before source edit — exit 1 with the expected assertion that `base` is missing from the loop's opening declaration block.
- TDD GREEN and applicable regression suite: focused test plus all `scripts/vc6-typeobject-*.test.py` — exit 0; all 16 typeobject regression scripts passed.
- First after-change probe attempt used the requested scratch `XDG_RUNTIME_DIR` and exited 1 before compilation because Wine could not create its server lock under `/run/user/1000` (read-only filesystem). `wine cmd /c ver` with project-local `XDG_RUNTIME_DIR="$PWD/build/cronbase/runtime"` exited 0 (`Microsoft Windows 10.0.19043`). Retried forced-fresh with `mkdir -p build/cron-current-after/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-current-after/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-current-after/probe.log 2>&1` — probe exit 2; summary `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. Former line-769 `base` diagnostics are gone. First current diagnostics advance to `typeobject.c(791)` C2275/C2065 on the distinct `PyTypeObject *new_base` declaration, left untouched. Capture: `build/cron-current-after/probe.log`.
- `git -C cpython describe --tags --exact-match HEAD` → `v3.11.16`; `git -C cpython rev-parse HEAD` → `41388c9cb160d0886d5ca00d2e6c8782608a4549`. Scoped nested/outer `git diff --check` — exit 0. No pythoncore/python.exe link, Wine interpreter execution, or real Windows 98 SE execution occurred; compiler-probe progress only.

Files changed by this slice: `cpython/Objects/typeobject.c`, new `scripts/vc6-typeobject-set-bases-base-c89.test.py`, and this status entry. Next frontier: force-fresh confirmation before handling only the late `new_base` declaration in `type_set_bases()`; keep subsequent declaration families separate. No completed port is claimed.

---

## Latest verified slice (`type_set_bases()` loop-index C89 declaration; frontier advances)

Date: 2026-10-16 UTC

The requested `/home/ubuntu/projects/python-win9x` path did not exist; this existing checkout at `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x` was used. Read `PORT_STATUS.md` and `README.md` before acting. The named legacy reference `references/python-3-win9x-msvc6.md` was not found under this workspace or the searched legacy-ports tree; used the loaded legacy-toolchain skill guidance. Preserved all prior dirty and untracked work; no reset, clean, stash, discard, commit, push, or publication. CPython baseline remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded `_blake2/blake2s_impl.c` sequence was no longer the active compiler frontier: a forced-fresh probe confirmed that file compiled, then first stopped at `typeobject.c(760)` in `type_set_bases()` on `for (Py_ssize_t i = 0; ...)`. One focused authenticated Codex CLI lane (`codex-cli 0.153.4`, OpenAI, workspace-write/ephemeral) implemented only this C89 loop-index slice under TDD. The test was run against the pre-edit source and failed on the expected missing declaration; the production change hoists `Py_ssize_t i;` adjacent to `n` and retains `i = 0` in the original loop initializer. It did not change the separate rollback loop. The existing `set-bases-n` regression was updated for the new declaration while keeping its earlier validation-order checks. Codex initially observed a test assertion failure because the first test version counted the separate rollback-loop `i`; the test was scoped to the requested validation loop and the complete applicable suite then passed. Snapshot/hash verification confirmed all pre-existing files except the two intentionally edited files remained unchanged.

Exact verification:

- Before-edit command: `mkdir -p "$TMPDIR/cp311-cron-blake-reprobe/runtime"; XDG_RUNTIME_DIR="$TMPDIR/cp311-cron-blake-reprobe/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > "$TMPDIR/cp311-cron-blake-reprobe/probe.log" 2>&1` — probe exit 2; summary `total=109 compiled=108 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First diagnostics were at `typeobject.c(760)` C2143/C2065/C2059 for the C99 loop declaration. Capture: `$TMPDIR/cp311-cron-blake-reprobe/probe.log`.
- TDD RED: `python3 scripts/vc6-typeobject-set-bases-index-c89.test.py` against saved pre-edit `typeobject.c` — exit 1 on the intended assertion that `Py_ssize_t i;` must follow `n` in the opening declaration block.
- Focused GREEN: `python3 scripts/vc6-typeobject-set-bases-index-c89.test.py` — exit 0, `type_set_bases loop index C89 declaration and unchanged evaluation order: PASS`.
- Applicable regression suite: `for test in scripts/vc6-typeobject-*.test.py; do python3 "$test" >/dev/null || { printf 'regression_failed=%s\\n' "$test"; exit 1; }; done` — exit 0; all 15 scripts passed.
- After-edit forced-fresh command: `mkdir -p "$TMPDIR/cp311-cron-blake-after/runtime"; XDG_RUNTIME_DIR="$TMPDIR/cp311-cron-blake-after/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > "$TMPDIR/cp311-cron-blake-after/probe.log" 2>&1` — probe exit 2; summary remains `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. The prior loop-declaration diagnostics at line 760 are gone. First current diagnostics advance to `typeobject.c(769)` C2275/C2065 for the separate late `PyTypeObject *base` declaration; subsequent errors remain untouched. Capture: `$TMPDIR/cp311-cron-blake-after/probe.log`.
- `git -C cpython describe --tags --exact-match HEAD` → `v3.11.16`; `git -C cpython rev-parse HEAD` → `41388c9cb160d0886d5ca00d2e6c8782608a4549`. Focused nested and outer `git diff --check` commands exited 0.
- No `pythoncore`/`python.exe` link, Wine interpreter execution, or real Windows 98 SE execution occurred. This is compiler-probe progress only.

Files changed by this slice: `cpython/Objects/typeobject.c`, new `scripts/vc6-typeobject-set-bases-index-c89.test.py`, updated `scripts/vc6-typeobject-set-bases-n-c89.test.py`, and this status entry. Next frontier: force-fresh re-probe before isolating the newly observed `type_set_bases()` late `PyTypeObject *base` declaration. Do not combine it with later declaration families or claim the port is complete.

---

## Latest verified slice (`_PyType_Name()` C89 local declaration; frontier advances)

Date: 2026-10-16 UTC

Read `PORT_STATUS.md`, `README.md`, and the legacy-toolchain guidance before acting. The specific `python-3-win9x-msvc6.md` reference file was not present in the expected workspace/profile locations. The instructed `/home/ubuntu/projects/python-win9x` path does not exist; used the current checkout at `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Preserved existing dirty/untracked state in both repositories; no reset, clean, stash, discard, commit, push, or publication. CPython baseline remains tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

A fresh probe confirmed the recorded `_PyType_Name()` blocker. A Hermes coding delegation could not start because the configured Anthropic provider has no credentials; the installed authenticated Codex CLI (`codex-cli 0.153.4`, workspace-write/ephemeral) performed one focused implementation lane under strict TDD. The new test failed before source change at the expected missing opening declaration. Only `const char *s;` was hoisted; assignment to `strrchr()` stays after the assertion at its prior evaluation point. Codex hash checks confirmed pre-existing dirty/untracked files remained unchanged; the production file differed only by the requested declaration/assignment split.

Exact verification:

- Before-change command: `mkdir -p "$TMPDIR/cp311-cron-reprobe/runtime"; XDG_RUNTIME_DIR="$TMPDIR/cp311-cron-reprobe/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > "$TMPDIR/cp311-cron-reprobe/probe.log" 2>&1` — probe exit 2; summary `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First diagnostics: `typeobject.c(463)` C2143, then `(464)` C2065 for `s`. Capture: `$TMPDIR/cp311-cron-reprobe/probe.log`.
- TDD RED: `python3 scripts/vc6-typeobject-type-name-c89.test.py` before production change — exit 1, expected assertion that `const char *s;` must be in the opening declaration block.
- GREEN and applicable regressions: focused test and `for test in scripts/vc6-typeobject-*.test.py; do python3 "$test" || exit "$?"; done` — exit 0; all nine typeobject test scripts passed.
- After-change forced-fresh command: `mkdir -p "$TMPDIR/cp311-cron-after/runtime"; XDG_RUNTIME_DIR="$TMPDIR/cp311-cron-after/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > "$TMPDIR/cp311-cron-after/probe.log" 2>&1` — probe exit 2; summary remains `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. The former lines 463-464 errors are gone. First current diagnostics advance to `typeobject.c(677)` C2275/C2065 for `new_mro`, then line 679 for `tuple`; these are separate and untouched. Capture: `$TMPDIR/cp311-cron-after/probe.log`.
- Baseline tag and commit verified unchanged. No pythoncore/python.exe link, Wine interpreter execution, or real Windows 98 SE execution occurred; compiler-probe progress only.

Files changed by this slice: `cpython/Objects/typeobject.c`, new `scripts/vc6-typeobject-type-name-c89.test.py`, and `PORT_STATUS.md`. Next frontier: force-fresh re-probe before choosing the next isolated `typeobject.c` defect family; first observed is the late `new_mro` declaration at line 677. Do not conflate a compiler-probe advance with a linked or target-running interpreter.

---

## Latest verified slice (`assign_version_tag()` C89 loop index; frontier advances)

Date: 2026-10-16 UTC

Read `PORT_STATUS.md`, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved the pre-existing dirty outer checkout and detached CPython edits; no reset, clean, stash, discard, commit, push, or publication. CPython baseline remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`. A focused authenticated Codex CLI lane (`codex-cli 0.153.4`, workspace-write/ephemeral) implemented only the confirmed `assign_version_tag()` loop-index declaration using strict TDD.

Exact verification:

- Before-change forced-fresh probe: `mkdir -p "$TMPDIR/cp311-current-frontier/runtime"; XDG_RUNTIME_DIR="$TMPDIR/cp311-current-frontier/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > "$TMPDIR/cp311-current-frontier/probe.log" 2>&1` — actual probe exit 2; summary `total=109 compiled=108 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First diagnostics were `typeobject.c(411)` C2143/C2065/C2059 cascading from `for (Py_ssize_t i = 0; ...)`. Capture: `$TMPDIR/cp311-current-frontier/probe.log`.
- TDD RED: `python3 scripts/vc6-typeobject-assign-version-tag-index-c89.test.py` before production change — exit 1 on the expected assertion that function-scope `i` must precede statements.
- GREEN and applicable regressions: focused test plus `for test in scripts/vc6-typeobject-*.test.py; do python3 "$test"; done` — exit 0; all nine typeobject tests pass. Two existing expectations (`vc6-typeobject-assign-version-tag-n-c89.test.py`, `vc6-typeobject-mro-bases-c89.test.py`) were narrowly adjusted for the hoisted declaration and assignment-form loop; their other behavior/order assertions remain.
- The only production change is `cpython/Objects/typeobject.c`: declare `Py_ssize_t i;` with `assign_version_tag()` locals and change the loop initializer to `i = 0`; bounds, body, and evaluation/control-flow order remain unchanged.
- After-change forced-fresh probe: `mkdir -p "$TMPDIR/cp311-after-assign-version-tag-index/runtime"; XDG_RUNTIME_DIR="$TMPDIR/cp311-after-assign-version-tag-index/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > "$TMPDIR/cp311-after-assign-version-tag-index/probe.log" 2>&1` — actual probe exit 2; summary remains `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. The former line-411 diagnostics are gone. New first stable blocker: `typeobject.c(463)` C2143 and `(464)` C2065 for the later `const char *s` declaration in `_PyType_Name()`; untouched. Capture: `$TMPDIR/cp311-after-assign-version-tag-index/probe.log`.
- `git -C cpython describe --tags --exact-match HEAD` → `v3.11.16`; `git -C cpython rev-parse HEAD` → `41388c9cb160d0886d5ca00d2e6c8782608a4549`. Scoped source/test `git diff --check` commands exited 0. No pythoncore/python.exe link, Wine interpreter execution, or real Windows 98 SE execution occurred; compiler-probe progress only.

Files changed by this slice: `cpython/Objects/typeobject.c`, new `scripts/vc6-typeobject-assign-version-tag-index-c89.test.py`, focused expectation updates in `scripts/vc6-typeobject-assign-version-tag-n-c89.test.py` and `scripts/vc6-typeobject-mro-bases-c89.test.py`, and this status entry. Next frontier: force-fresh re-probe before choosing a separate slice for `_PyType_Name()`'s `s` declaration if it remains first. Do not combine it with later `typeobject.c` blockers or claim a completed port.

---

## Latest verified slice (`type_mro_modified()` `custom_mro` C89 declaration; frontier advances)

Date: 2026-10-15 UTC

Read `PORT_STATUS.md`, `README.md`, and the CPython 3.11.16 Win9x/MSVC6 reference before acting. Preserved all pre-existing outer and detached CPython changes; no reset, clean, stash, discard, commit, push, publication, or patch regeneration. Baseline remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded `type_mro_modified()` frontier was force-reprobed and confirmed: `_blake2/blake2s_impl.c` compiled, then VC6 reported C2143 at `typeobject.c(362)` for the late `int custom_mro` declaration; a later C2065 at line 365 was consequential. One focused authenticated Codex CLI lane (`codex-cli 0.153.4`, workspace-write/ephemeral) used strict TDD. New `scripts/vc6-typeobject-custom-mro-c89.test.py` failed before the production edit with the expected missing opening-block declaration assertion. The only production change declares `custom_mro` in the opening declaration block of `if (custom)` and assigns it after both successful lookups, at the original evaluation point before decrefs and the conditional. Lookup failure handling and evaluation order are unchanged. No later blocker was edited.

Exact verification:

- Before-change forced-fresh command: `mkdir -p "$TMPDIR/cp311-current-frontier/runtime"; XDG_RUNTIME_DIR="$TMPDIR/cp311-current-frontier/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > "$TMPDIR/cp311-current-frontier/probe.log" 2>&1` — probe exit 2; summary `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First stable diagnostic: `typeobject.c(362)` C2143; later diagnostic: `typeobject.c(365)` C2065 for `custom_mro`. Capture: `$TMPDIR/cp311-current-frontier/probe.log`.
- TDD RED: `python3 scripts/vc6-typeobject-custom-mro-c89.test.py` before production edit — exit 1, expected assertion `custom_mro must be declared in the opening declaration block`.
- GREEN and applicable regressions: focused test and `for test in scripts/vc6-typeobject-*.test.py; do python3 "$test" || exit "$?"; done` — exit 0; all six typeobject scripts passed.
- After-change forced-fresh command with equivalent `XDG_RUNTIME_DIR="$TMPDIR/cp311-after-custom-mro/runtime"` environment — probe exit 2; summary `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. Former line-362/365 diagnostics are gone. Next first diagnostics are separate `typeobject.c(407)` C2275/C2065 for `bases`, followed by `n` and loop-index diagnostics at lines 408-409; these remain untouched. Capture: `$TMPDIR/cp311-after-custom-mro/probe.log`.
- Focused and all typeobject tests — exit 0. `git -C cpython diff --check -- Objects/typeobject.c` and `git diff --check -- scripts/vc6-typeobject-custom-mro-c89.test.py` — exit 0. Baseline tag/commit remain unchanged.
- No pythoncore/python.exe link, Wine interpreter execution, or real Windows 98 SE execution occurred. This is compiler-probe progress only, not a completed port.

Files changed by this slice: `cpython/Objects/typeobject.c` (only the `custom_mro` declaration/assignment split), new `scripts/vc6-typeobject-custom-mro-c89.test.py`, and this status entry. Next frontier: force-fresh confirm, then address only the first remaining `type_mro_modified()` `bases` declaration if still current; keep `n` and loop index as separate defect families.

---

## Previous verified slice (`PyType_Modified()` `obj` declaration; frontier advances)

Date: 2026-10-15 UTC

Read `PORT_STATUS.md`, `README.md`, and the CPython 3.11.16 Win9x/MSVC6 reference before acting. Preserved all existing outer and detached CPython work; no reset, clean, stash, discard, commit, push, publication, or patch regeneration. Baseline remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The prior recorded `PyType_Modified()` `obj` declaration frontier was force-reprobed and confirmed. `_blake2/blake2s_impl.c` compiled; the first diagnostics were `typeobject.c(318)` C2143 and `(319)` C2065 for the late initialized `PyObject *obj`. One focused authenticated Codex CLI lane (`codex-cli 0.153.4`, workspace-write/ephemeral) followed strict TDD. It updated `scripts/vc6-typeobject-modified-ref-c89.test.py` first; the RED run exited 1 on the expected missing opening-block `obj` declaration. The minimal production edit hoists `PyObject *obj;` into `PyType_Modified()`'s opening declaration block and changes the old declaration to `obj = PyWeakref_GET_OBJECT(ref);` at the original evaluation point. The directly applicable subclasses test expectation was narrowly updated. No other production defect family was changed. No commit or publication occurred.

Exact verification:

- Before-change forced-fresh command: `mkdir -p "$TMPDIR/cp311-frontier-refresh/runtime"; XDG_RUNTIME_DIR="$TMPDIR/cp311-frontier-refresh/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > "$TMPDIR/cp311-frontier-refresh/probe.log" 2>&1` — compiler probe exit 2; summary `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First errors: `typeobject.c(318)` C2143 and `(319)` C2065 on `obj`; later diagnostics were subsequent distinct blockers. Capture: `$TMPDIR/cp311-frontier-refresh/probe.log`.
- TDD RED: `python3 scripts/vc6-typeobject-modified-ref-c89.test.py` after test-only update and before source edit — exit 1, expected assertion: `PyType_Modified: PyObject *obj; must be in the opening declaration block`.
- GREEN and applicable regressions: focused ref test and `for test in scripts/vc6-typeobject-*.test.py; do python3 "$test" || exit "$?"; done` — exit 0; all five typeobject scripts passed.
- After-change forced-fresh command: `mkdir -p "$TMPDIR/cp311-frontier-after-obj/runtime"; XDG_RUNTIME_DIR="$TMPDIR/cp311-frontier-after-obj/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > "$TMPDIR/cp311-frontier-after-obj/probe.log" 2>&1` — probe exit 2; summary `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. Former line-318/319 `obj` diagnostics are gone. The next diagnostics advance to the separate `type_mro_modified()` C89 declaration at line 362 (C2143), followed by `custom_mro` at line 365; neither was changed. Capture: `$TMPDIR/cp311-frontier-after-obj/probe.log`.
- `git -C cpython describe --tags --exact-match HEAD` → `v3.11.16`; `git -C cpython rev-parse HEAD` → `41388c9cb160d0886d5ca00d2e6c8782608a4549`. Scoped nested and outer diff checks exited 0. Before/after porcelain snapshots match in both repositories outside this intentional slice; extensive pre-existing changes remain present.
- No pythoncore/python.exe link, Wine interpreter execution, or real Windows 98 SE execution occurred. Compiler-probe progress only; no completed port is claimed.

Files changed by this slice: `cpython/Objects/typeobject.c` (only `PyType_Modified()`'s `obj` declaration/assignment split), `scripts/vc6-typeobject-modified-ref-c89.test.py`, `scripts/vc6-typeobject-modified-subclasses-c89.test.py`, and this status entry. Next frontier: force-fresh probe, then handle only the newly confirmed `type_mro_modified()` blocker if still first; keep the later `custom_mro` declaration separate.

---

## Latest verified slice (`PyType_Modified()` C89 loop-index declaration; frontier advances)

Date: 2026-10-15 09:17 UTC

Read `PORT_STATUS.md` and `README.md` before acting. The requested CPython Win9x/MSVC6 reference file was not found in this checkout or active profile path; followed the loaded legacy-toolchain skill guidance. Preserved all existing outer and detached CPython changes; no reset, clean, stash, discard, commit, push, publication, or patch regeneration. CPython baseline remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded frontier was force-reprobed before editing and confirmed: `_blake2/blake2s_impl.c` compiled, then the first diagnostic was `typeobject.c(313)` on `Py_ssize_t i = 0;`. A focused Hermes coding-subagent launch was unavailable because the configured Anthropic provider had no credentials. Authenticated `codex-cli 0.153.4` was used as one focused implementation lane, with strict TDD. New `scripts/vc6-typeobject-modified-index-c89.test.py` failed before the production edit (exit 1) on the intended assertion that `Py_ssize_t i;` belongs in the opening declaration block. The production change hoists only `i` and moves `i = 0;` to the exact original initialization point. Updated the directly applicable subclasses declaration expectation to permit the hoisted `i`. The distinct `ref` and `obj` declarations and all later blockers remain untouched.

Exact verification:

- Before-edit forced-fresh command: `XDG_RUNTIME_DIR="$TMPDIR/cp311-frontier/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2; summary `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First diagnostics: `typeobject.c(313)` C2143 for the late loop-index declaration. Capture: `$TMPDIR/cp311-frontier/probe.log`.
- TDD RED: `python3 scripts/vc6-typeobject-modified-index-c89.test.py` before production edit — exit 1, expected assertion `PyType_Modified: Py_ssize_t i; must be declared at function entry`.
- GREEN and applicable regression: focused test and `for test in scripts/vc6-typeobject-*.test.py; do python3 "$test"; done` — exit 0; all four typeobject tests passed.
- After-edit forced-fresh command with the same environment/command — probe exit 2; summary `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. The former `typeobject.c(313)` loop-index diagnostic is gone; first current diagnostic advances to `typeobject.c(315)` C2275/C2065 on the separate `PyObject *ref` declaration. `obj` at line 318 and other typeobject blockers are later and untouched. Capture: `$TMPDIR/cp311-frontier-after/probe.log`.
- `git -C cpython describe --tags --exact-match HEAD` → `v3.11.16`; `git -C cpython rev-parse HEAD` → `41388c9cb160d0886d5ca00d2e6c8782608a4549`. Scoped nested and outer `git diff --check` on the three slice files — exit 0.
- No pythoncore/python.exe link, Wine interpreter execution, or real Windows 98 SE execution occurred. Compiler-probe progress only; no completed port is claimed.

Files changed by this slice: `cpython/Objects/typeobject.c` (only the `PyType_Modified()` index declaration/assignment split), new `scripts/vc6-typeobject-modified-index-c89.test.py`, narrow expectation update to `scripts/vc6-typeobject-modified-subclasses-c89.test.py`, and this status entry. Next frontier: force-fresh probe, then address only the `PyObject *ref` declaration in `PyType_Modified()` if still first.

---

## Previous verified slice (`PyType_Modified()` C89 subclasses declaration; frontier advances)

Date: 2026-10-15 07:05 UTC

Read `PORT_STATUS.md` and `README.md` before acting. The requested legacy-toolchain reference file was not found in this checkout or active profile path; the loaded legacy-toolchain skill guidance was followed. Preserved all existing outer and detached CPython work; no reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. Baseline remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The status-recorded `_PyType_InitCache()` loop-index blocker was force-reprobed and its fix remains effective. `_blake2/blake2s_impl.c` compiled. The current first stable blocker was `PyType_Modified()`'s late `PyObject *subclasses = type->tp_subclasses;` at `typeobject.c(307)`. One focused Codex CLI lane (`codex-cli 0.153.4`, OpenAI authenticated, workspace-write/ephemeral) followed strict TDD for only this declaration family. New `scripts/vc6-typeobject-modified-subclasses-c89.test.py` failed before the production edit with the intended assertion that `subclasses` must be declared at function entry. The sole production change hoists `PyObject *subclasses;` and leaves `subclasses = type->tp_subclasses;` immediately after the existing early-return guard. No other production defect family was changed.

Exact verification:

- Before-change forced-fresh probe: `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` with `XDG_RUNTIME_DIR="$TMPDIR/cron-reprobe/runtime"`, `WINEPREFIX=/home/ubuntu/.wine-win9xport`, and `WINEDEBUG=-all`; captured at `$TMPDIR/cron-reprobe/probe.log`. Probe exit 2; summary `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First diagnostics were `typeobject.c(307)` C2275/C2065 for `PyObject`/`subclasses`, followed by declaration errors at lines 311-316. No source edits occurred before this probe.
- TDD RED: `python3 scripts/vc6-typeobject-modified-subclasses-c89.test.py` before source edit — exit 1 at the expected missing function-entry declaration assertion.
- TDD GREEN: same focused test after source edit — exit 0. Applicable regression command `for test in scripts/vc6-typeobject-*.test.py; do python3 "$test" || exit "$?"; done` — exit 0; all 3 typeobject tests passed.
- After-change forced-fresh probe using the same command/environment, captured at `$TMPDIR/cron-after-subsclasses/probe.log` — probe exit 2; summary `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. The former line-307 diagnostics are gone. The first remaining diagnostics are at `typeobject.c(313)` C2143, then line 314 C2275/C2065 for the later `ref` declaration and line 315 for `i`; these are distinct next declaration families and remain untouched.
- `git -C cpython describe --tags --exact-match HEAD` → `v3.11.16`; `git -C cpython rev-parse HEAD` → `41388c9cb160d0886d5ca00d2e6c8782608a4549`. Scoped `git -C cpython diff --check -- Objects/typeobject.c` and outer `git diff --check -- PORT_STATUS.md scripts/vc6-typeobject-modified-subclasses-c89.test.py` — exit 0. The complete nested diff also contains earlier pre-existing typeobject edits; this slice's addition is restricted to `PyType_Modified()`.
- No DLL/executable link, Wine interpreter execution, or real Windows 98 SE execution occurred. Compiler-probe progress only; no completed port is claimed.

Files changed by this slice: `cpython/Objects/typeobject.c` (one declaration/assignment split in `PyType_Modified()`), new `scripts/vc6-typeobject-modified-subclasses-c89.test.py`, and this status entry. Next frontier: force-fresh re-probe, then isolate only the `ref`/loop-index declaration blockers in `PyType_Modified()`; do not combine them with later `type_mro_modified()` or other `typeobject.c` diagnostics.

---

## Previous verified slice (`_PyType_InitCache()` C89 loop index declaration; frontier advances)

Date: 2026-10-15 UTC

Read `PORT_STATUS.md`, `README.md`, and the CPython 3.11.16 Win9x/MSVC6 reference before acting. Preserved existing outer and detached CPython work; no reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. Baseline remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`. A single delegated coding lane was attempted but could not start because no Anthropic credentials are configured; implementation proceeded directly under strict TDD.

The stale recorded tupleobject frontier was replaced based on a forced-fresh probe. It compiled `_blake2/blake2s_impl.c` and stopped in `typeobject.c(228)` at the C89 loop-local `Py_ssize_t i`. The narrow TDD change hoists `i` into `_PyType_InitCache()`'s opening declarations and retains loop bounds, increment, and body.

Exact verification:

- Baseline: `git -C cpython describe --tags --exact-match HEAD` → `v3.11.16`; `git -C cpython rev-parse HEAD` → `41388c9cb160d0886d5ca00d2e6c8782608a4549`.
- Before-change forced-fresh command used `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` with project-local `XDG_RUNTIME_DIR` and `WINEPREFIX=/home/ubuntu/.wine-win9xport` — exit 2; `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First stable error group was `typeobject.c(228)` C2143/C2065/C2059 for loop-local `i`. Capture: `$TMPDIR/cron-current-frontier/probe.log`.
- TDD RED: `python3 scripts/vc6-typeobject-mro-loop-c89.test.py` before production edit — exit 1 on missing hoisted `Py_ssize_t i;`.
- GREEN/regressions: focused test and `for test in scripts/vc6-typeobject-*.test.py; do python3 "$test"; done` — exit 0; both typeobject tests passed.
- After-change forced-fresh probe with the same command/environment — exit 2; `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. Line-228 loop declaration errors are gone; first remaining group is `typeobject.c(307)` for a late `PyObject *subclasses` declaration. Full capture: `$TMPDIR/cron-current-after/probe.log`.
- `git -C cpython diff --check -- Objects/typeobject.c` and `git diff --check -- scripts/vc6-typeobject-mro-loop-c89.test.py` — exit 0. No DLL/executable link, Wine interpreter execution, or Windows 98 SE execution occurred.

Files changed: `cpython/Objects/typeobject.c` (only `_PyType_InitCache()` loop index declaration split), new `scripts/vc6-typeobject-mro-loop-c89.test.py`, and this entry. Next frontier: freshly re-probe then handle only the `typeobject.c(307)` late `subclasses` declaration. Compiler-probe progress only; no completed port is claimed.

---

## Previous verified slice (`maybe_freelist_push()` index C89 declaration; frontier advances)

Date: 2026-10-14 UTC

Read `PORT_STATUS.md`, `README.md`, and `legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved the existing outer and detached CPython work; no reset, clean, stash, discard, commit, push, publication, or patch regeneration. CPython baseline remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded tupleobject frontier was rechecked with a forced-fresh MSVC6 probe before editing. `_blake2/blake2s_impl.c` had already compiled, and the `maybe_freelist_push()` late `Py_ssize_t index` declaration at line 1247 was indeed the first current diagnostic. One focused Codex CLI coding lane was used. It added a single C89 regression test, observed RED, then moved the declaration into the function's declaration block while preserving assignment after the empty-tuple return. The later C89 `for` loop blockers were deliberately left untouched.

Exact verification:

- Before-change probe: `mkdir -p build/cron-20261014-tuple-index-before/runtime && XDG_RUNTIME_DIR="$PWD/build/cron-20261014-tuple-index-before/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261014-tuple-index-before/probe.log 2>&1` — probe exit 2; `total=108 compiled=107 cached=0 skipped=0`. First errors were at `tupleobject.c(1247)` (C2275, C2146, C2065); next independent errors were C89 loops at lines 1268 and 1287. `_blake2/blake2s_impl.c` compiled. Log: `build/cron-20261014-tuple-index-before/probe.log`.
- TDD RED: `python3 scripts/vc6-tupleobject-freelist-push-index-c89.test.py` before source edit — exit 1, expected assertion that `index` must be declared before debug assertion and empty-tuple check.
- TDD GREEN: same focused command after source edit — exit 0, `maybe_freelist_push index C89 declaration and evaluation order: PASS`.
- Applicable regressions: `for test in scripts/vc6-tupleobject-*.test.py; do python3 "$test"; result=$?; printf '%s: exit %s\\n' "$test" "$result"; if [ "$result" -ne 0 ]; then exit "$result"; fi; done` — exit 0; all 14 tupleobject tests passed.
- After-change forced-fresh probe: `mkdir -p build/cron-20261014-tuple-index-after/runtime && XDG_RUNTIME_DIR="$PWD/build/cron-20261014-tuple-index-after/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261014-tuple-index-after/probe.log 2>&1` — probe exit 2; `total=108 compiled=107 cached=0 skipped=0`. The line-1247 errors are gone. The first remaining diagnostics are now C89 `for` loop declarations at `tupleobject.c(1269)` and `(1288)` (C2143/C2146/C2065/C2059 cascades). Log: `build/cron-20261014-tuple-index-after/probe.log`.
- `git diff --check -- PORT_STATUS.md scripts/vc6-tupleobject-freelist-push-index-c89.test.py` and `git -C cpython diff --check -- Objects/tupleobject.c` — both exit 0. Detached baseline HEAD remains unchanged.

Files changed by this slice: `cpython/Objects/tupleobject.c` (only declaration and assignment in `maybe_freelist_push()`), new `scripts/vc6-tupleobject-freelist-push-index-c89.test.py`, and this status entry. Next compiler frontier: `maybe_freelist_clear()` loop declaration at line 1269; treat its defect family separately from the later loop in `_PyTuple_DebugMallocStats()` at line 1288. No linked `pythoncore.dll`/`python.exe`, Wine interpreter run, or real Windows 98 SE execution occurred: this is compiler-probe progress only, not a completed port.

---

## Previous verified slice (`PyTuple_Type.tp_vectorcall` C89 initializer; frontier advances)

Date: 2026-10-14 15:38 UTC

Read `PORT_STATUS.md`, `README.md`, and the applicable CPython 3.11.16 Win9x/MSVC6 reference before acting. Preserved all pre-existing outer and detached CPython work; no reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. CPython baseline remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The requested `_blake2/blake2s_impl.c` sequence was not the current compiler frontier: forced-fresh probe confirmed it compiles. The previously documented tupleobject designated-initializer blocker remained current. A single focused coding-agent delegation was attempted, but the configured Hermes provider could not start (Anthropic credentials unavailable). The installed authenticated Codex CLI was used as the focused implementation lane. It applied strict TDD to only `PyTuple_Type`'s `.tp_vectorcall` designated initializer at line 919. New `scripts/vc6-tupleobject-type-vectorcall-c89.test.py` failed before production edits (exit 1) because strict C89 rejected the designated initializer. The source change replaces that one designator with nine zero positional entries for `tp_is_gc` through `tp_finalize`, then `tuple_vectorcall` for `tp_vectorcall`. These entries follow the checkout's `PyTypeObject` field order. No `_blake2` file or other tupleobject defect family was changed.

Exact verification:

- Before-change forced-fresh probe: `mkdir -p build/cron-20261014-blake-frontier/runtime && XDG_RUNTIME_DIR="$PWD/build/cron-20261014-blake-frontier/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261014-blake-frontier/probe.log 2>&1` — actual probe exit 2; summary `total=108 compiled=107 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First current compiler errors: `tupleobject.c(919)` C2059 on `.`; later distinct errors at lines 1238, 1259, and 1278 were untouched. Capture: `build/cron-20261014-blake-frontier/probe.log`.
- Focused coding-agent delegation attempt: unavailable before child startup because Anthropic credentials are not configured. Authenticated `codex-cli 0.153.4` was used in a single `codex exec --sandbox workspace-write --ephemeral` lane. No commits or resets.
- TDD RED: `python3 scripts/vc6-tupleobject-type-vectorcall-c89.test.py cpython/Objects/tupleobject.c` before source edit — exit 1, expected strict C89 designated-initializer failure. GREEN: same command after edit — exit 0; compiles the exact extracted initializer under `cc -std=c89 -pedantic-errors -Wall -Wextra -Werror` and checks all 48 semantic fields.
- Applicable regressions: `for test in scripts/vc6-tupleobject-*.test.py; do python3 "$test" cpython/Objects/tupleobject.c; done` — exit 0 for all 13 scripts, including the new initializer regression.
- After-change forced-fresh probe: `mkdir -p build/cron-20261014-tuple-vectorcall-after/runtime && XDG_RUNTIME_DIR="$PWD/build/cron-20261014-tuple-vectorcall-after/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261014-tuple-vectorcall-after/probe.log 2>&1` — actual probe exit 2; summary `total=108 compiled=107 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. Former line-919 C2059 is gone. First remaining compiler diagnostics are now at `tupleobject.c(1247)` on `Py_ssize_t index` (C2275/C2146/C2065), followed by separate C89 loops at lines 1268 and 1287. Capture: `build/cron-20261014-tuple-vectorcall-after/probe.log`.
- `git diff --check -- PORT_STATUS.md scripts/vc6-tupleobject-type-vectorcall-c89.test.py` and `git -C cpython diff --check -- Objects/tupleobject.c` — exit 0. Baseline tag/commit unchanged.
- No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution occurred. This is compiler-probe progress only.

Files changed by this slice: `cpython/Objects/tupleobject.c` (only `PyTuple_Type` initializer tail), new `scripts/vc6-tupleobject-type-vectorcall-c89.test.py`, and this status entry. Next frontier: in a separate TDD slice, force-fresh confirm and address only the `tupleobject.c:1247` late `index` declaration. Do not conflate compiler-probe progress with a linked or target-running interpreter. No completed port is claimed.

---

## Previous verified slice (`tuplerepeat()` `dest_end` declaration; frontier advances)

Date: 2026-10-14 11:13 UTC

Read `PORT_STATUS.md`, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved all pre-existing outer and detached CPython work; no reset, clean, stash, discard, commit, push, publication, or patch regeneration. CPython baseline remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The prior `tuplerepeat()` `dest_end` frontier was force-reprobed first and confirmed. A single focused coding-agent delegation was attempted, but the provider could not start because Anthropic credentials are unavailable. No child edits occurred. I proceeded with one narrow local TDD slice: added `scripts/vc6-tupleobject-repeat-dest-end-c89.test.py`; its pre-edit run failed with exit 1 on the intended missing opening-declaration assertion. The sole production change declares `PyObject **dest_end` in the opening block and changes the original initialized declaration to `dest_end = dest + size;` at the same point immediately after `dest = np->ob_item`. Updated the directly applicable existing `scripts/vc6-tupleobject-repeat-dest-c89.test.py` expectation to accept the new adjacent declaration and assignment while preserving its evaluation-order checks. Other tupleobject defect families were not edited.

Exact verification:

- Before-change forced-fresh command: `mkdir -p build/cron-20261014-frontier-refresh/runtime && XDG_RUNTIME_DIR="$PWD/build/cron-20261014-frontier-refresh/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261014-frontier-refresh/probe.log 2>&1` — actual probe exit 2; summary `total=108 compiled=107 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First stable diagnostic family: `tupleobject.c(530)` C2275 (`PyObject`), C2065 (`dest_end`), C2100. Distinct later errors include `nargs` at 732, designated initializer at 916, `index` at 1235, and C89 loops at 1256/1275. Capture: `build/cron-20261014-frontier-refresh/probe.log`.
- Coding delegation: failed before startup due missing Anthropic credentials/provider; no child edits.
- TDD RED: `python3 scripts/vc6-tupleobject-repeat-dest-end-c89.test.py` before production edit — exit 1 on the intended assertion `dest_end must be declared in the opening declaration block`.
- GREEN/regressions: focused dest_end test and all `scripts/vc6-tupleobject-*.test.py` — exit 0; all 11 tupleobject regressions passed. The pre-existing `repeat-dest` check initially failed on its obsolete declaration-with-initializer expectation; that narrow assertion was aligned with the split declaration/assignment, and the complete suite then passed.
- After-change forced-fresh command: `mkdir -p build/cron-20261014-frontier-after/runtime && XDG_RUNTIME_DIR="$PWD/build/cron-20261014-frontier-after/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261014-frontier-after/probe.log 2>&1` — actual probe exit 2; summary `total=108 compiled=107 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. Former line-530 diagnostics are gone; next tupleobject blocker is line 733 (`Py_ssize_t nargs`) with C2275/C2146/C2065, followed by separate line 917 designated initializer and later declaration/loop errors. Wine also logged that the project-local Wayland socket path exceeds 108 bytes; compilation nevertheless ran to tupleobject.c and returned compiler exit 2. Capture: `build/cron-20261014-frontier-after/probe.log`.
- All tupleobject tests after updating the expectation: 11 passed; `git -C cpython diff --check -- Objects/tupleobject.c` and outer diff checks on the two focused tests and status — exit 0. Baseline tag/commit unchanged.
- No `pythoncore.dll`/`python.exe` link, Wine interpreter execution, or real Windows 98 SE execution occurred. This is compiler-probe progress only.

Files changed by this slice: `cpython/Objects/tupleobject.c`, new `scripts/vc6-tupleobject-repeat-dest-end-c89.test.py`, updated `scripts/vc6-tupleobject-repeat-dest-c89.test.py`, and this status entry. Next frontier: in a separate TDD slice, force-fresh confirm and address only `tuplerepeat()`'s late `Py_ssize_t nargs` declaration at line 733. No completed port is claimed.

---

## Latest run (fresh `tuplerepeat()` `dest_end` frontier; implementation lane unavailable)

Date: 2026-10-14 UTC

Read `PORT_STATUS.md`, `README.md`, and the CPython 3.11.16 Win9x/MSVC6 reference before acting. Preserved the existing outer and detached CPython work; no reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. Baseline remains tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The previous status-recorded `tuplerepeat()` `dest_end` blocker was force-reprobed before any implementation work and remains current. One focused coding-agent delegation was attempted for this single defect family, but failed before child startup because the configured Hermes delegation provider requires unavailable Anthropic credentials. No child edits occurred. Per delegation/TDD constraints, this run is diagnostics-only: no RED/GREEN cycle and no source or regression-test edit is claimed. The existing tupleobject tests were run as regression diagnostics only.

Exact verification:

- Forced-fresh command: `mkdir -p build/cron-20261014-destend-reprobe/runtime && XDG_RUNTIME_DIR="$PWD/build/cron-20261014-destend-reprobe/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261014-destend-reprobe/probe.log 2>&1` — probe exit 2; summary `total=108 compiled=107 cached=0 skipped=0`. First stable diagnostics: `tupleobject.c(530)` C2275 (`PyObject`), C2065 (`dest_end`), and C2100. Later distinct diagnostics include `nargs` at line 732, designated initializer at 916, `index` at 1235, and C89 loop declarations at 1256/1275. Full compiler capture: `build/cron-20261014-destend-reprobe/probe.log`.
- Focused coding-agent delegation for only the confirmed `dest_end` declaration — failed before startup: no Anthropic credentials/configured provider; no child edits.
- `set -e; for test in scripts/vc6-tupleobject-*.test.py; do python3 "$test"; done` — exit 0; all ten tupleobject regression scripts passed.
- `git -C cpython describe --tags --exact-match HEAD` → `v3.11.16`; `git -C cpython rev-parse HEAD` → `41388c9cb160d0886d5ca00d2e6c8782608a4549`. Scoped `git -C cpython diff --check -- Objects/tupleobject.c` and `git diff --check -- PORT_STATUS.md` — exit 0.
- No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution was produced. This remains compiler-probe progress only.

Files changed this run: `PORT_STATUS.md` only; probe evidence is under `build/cron-20261014-destend-reprobe/`. Next frontier: retry one strictly TDD coding slice for only `tuplerepeat()`'s `dest_end` declaration when the delegated coding provider can start. Preserve the assignment at its original evaluation point; keep all later tupleobject diagnostics separate. No port completion is claimed.

---

## Latest verified slice (`tuplerepeat()` destination declaration; frontier advances)

Date: 2026-10-14 06:42 UTC

Read `PORT_STATUS.md`, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved existing outer and detached CPython work; no reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. CPython baseline remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The status-recorded first blocker was force-reprobed before implementation and remains in `tuplerepeat()`: the late `PyObject **dest = np->ob_item` declaration. One focused Codex CLI coding lane (`codex-cli 0.153.4`, logged in, workspace-write/ephemeral; session `01a1392a-bdf0-7a73-948c-1dc78e92a676`) followed strict TDD. New `scripts/vc6-tupleobject-repeat-dest-c89.test.py` failed before production edit (exit 1) on the intended assertion that `dest` belongs to the opening declaration block. The sole production edit declares `dest` with the other function locals and assigns `dest = np->ob_item` immediately after successful tuple allocation at the original evaluation point. `dest_end` and all later declaration families remain untouched. A pre-edit hash snapshot covered 192 existing changed/untracked paths across both repositories; verification confirmed all 191 unrelated files unchanged and the CPython source differed only by this declaration/assignment split.

Exact verification:

- Baseline: `git -C cpython describe --tags --exact-match HEAD` → `v3.11.16`; `git -C cpython rev-parse HEAD` → `41388c9cb160d0886d5ca00d2e6c8782608a4549`.
- Before-change forced-fresh command: `mkdir -p build/cron-20261014-reprobe/runtime && XDG_RUNTIME_DIR="$PWD/build/cron-20261014-reprobe/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261014-reprobe/probe.log 2>&1` — actual probe exit 2; summary `total=108 compiled=107 cached=0 skipped=0`. First stable diagnostics were in `tupleobject.c(528)` C2275/C2065/C2100 for late `PyObject **dest`; separate `dest_end` at line 529 and later tupleobject diagnostics followed. Capture: `build/cron-20261014-reprobe/probe.log`.
- TDD RED: `python3 scripts/vc6-tupleobject-repeat-dest-c89.test.py` before source edit — exit 1, expected opening-declaration assertion. GREEN: same command after source edit — exit 0.
- Applicable regressions: `for test in scripts/vc6-tupleobject-*.test.py; do python3 "$test" || exit "$?"; done` — exit 0; all ten tupleobject regression scripts pass.
- After-change forced-fresh command: `mkdir -p build/cron-20261014-after-tuplerepeat-dest/runtime && XDG_RUNTIME_DIR="$PWD/build/cron-20261014-after-tuplerepeat-dest/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261014-after-tuplerepeat-dest/probe.log 2>&1` — actual probe exit 2; summary `total=108 compiled=107 cached=0 skipped=0`. Former `tuplerepeat()` `dest` diagnostics are gone. The new first blocker is `tupleobject.c(530)` C2275/C2065/C2100 for the distinct late `PyObject **dest_end` declaration; later diagnostics include `nargs` at line 732, designated initializer at 916, `index` at 1235, and C89 loop declarations at 1256/1275, all untouched. The probe also logged non-fatal Wine errors that its project-local `XDG_RUNTIME_DIR` wayland socket path exceeds 108 bytes; compilation proceeded to `tupleobject.c` and returned the compiler's exit 2. Capture: `build/cron-20261014-after-tuplerepeat-dest/probe.log`.
- Scoped `git -C cpython diff --check -- Objects/tupleobject.c` and `git diff --check -- scripts/vc6-tupleobject-repeat-dest-c89.test.py` — exit 0. Baseline tag/commit remain unchanged.
- No `pythoncore.dll`/`python.exe` link, Wine interpreter execution, or real Windows 98 SE execution was produced. This is compile-frontier progress only, not a completed port.

Files changed by this slice: `cpython/Objects/tupleobject.c` (only `tuplerepeat()` `dest` declaration/assignment split), new `scripts/vc6-tupleobject-repeat-dest-c89.test.py`, and this status entry. Next frontier: in a separate TDD slice, force-fresh confirm and address only `tuplerepeat()`'s `dest_end` declaration. Keep the later tupleobject diagnostics separate.

---

## Latest verified slice (`tupleconcat()` b declaration; host frontier advances)

Date: 2026-10-14 UTC

Preserved pre-existing outer/nested work. No reset, clean, stash, commit, push, or compatibility-patch regeneration. Codex sandbox probe was blocked by Wine server-lock permissions; host tools completed the real forced-fresh probes. Production change only splits `tupleconcat()`'s late `PyTupleObject *b` declaration into an opening declaration and an assignment at its original point after type validation. Added `scripts/vc6-tupleobject-concat-b-c89.test.py`.

Verification:
- Before forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/manual-20261014-host-before/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh`, stdout/stderr in `build/manual-20261014-host-before/probe.log`: exit 2; `total=108 compiled=107 cached=0 skipped=0`; first errors at tupleobject.c(471), C2275/C2065 for b. Earlier foreground attempt timed out at 180s, was confirmed stopped, then rerun as a tracked background process to completion.
- RED: focused new regression exit 1 on intended opening-declaration assertion. GREEN after minimal source edit: exit 0.
- All nine tupleobject regression scripts pass with explicit failure propagation. Scoped nested diff check passes.
- After forced-fresh probe: identical command using `build/manual-20261014-host-after/runtime`, captured in `build/manual-20261014-host-after/probe.log`: exit 2; `total=108 compiled=107 cached=0 skipped=0`. Former tupleconcat errors are gone. First remaining blocker advances to `tuplerepeat()` at tupleobject.c(528), C2275/C2065 on late `PyObject **dest`; separate dest_end at 529 remains untouched.

Compile-frontier progress only; no linked DLL/interpreter, Wine interpreter execution, or Windows 98 runtime proof. Next slice: reproduce and isolate tuplerepeat's destination declaration. Nested source edits are not yet regenerated into the tracked compatibility patch.

---

## Latest run (tupleconcat slice blocked before compilation)

Date: 2026-10-14 UTC

Read README.md, the top of PORT_STATUS.md, and the legacy-python-porting skill and references/cpython-msvc600-frontier.md. Nested baseline: `git -C cpython rev-parse HEAD` → `41388c9cb160d0886d5ca00d2e6c8782608a4549` (exit 0); `git -C cpython describe --tags --exact-match` → `v3.11.16` (exit 0). Nested HEAD is detached (`git -C cpython symbolic-ref -q --short HEAD`, exit 1); outer branch is `main`. Host: Linux 7.0.0-38-generic x86_64 GNU/Linux; `wine --version` → `wine-10.0 (Ubuntu 10.0~repack-12ubuntu1)` (exit 0). The MSVC6 compiler never started, so no fresh compiler banner was obtained.

- Before edits: `for test in scripts/vc6-tupleobject-*.test.py; do python3 "$test" || exit "$?"; done` — exit 0, all eight standalone regressions passed.
- Exact fresh-frontier command: `mkdir -p build/manual-20261014-tupleconcat-before/runtime && XDG_RUNTIME_DIR="$PWD/build/manual-20261014-tupleconcat-before/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/manual-20261014-tupleconcat-before/probe.log 2>&1` — exit 1, also saved in `build/manual-20261014-tupleconcat-before/exit-status.txt`. Summary: `total=1 compiled=0 cached=0 skipped=0`.
- The first attempted source was `cpython/Modules/getpath.c`. Wine reported `sock_init: ERROR in sock_check_pollhup()` and `wineserver: error creating /run/user/1000/wine/server-801-136fb0/lock: Read-only file system`. This is an environment blocker, not a verified C diagnostic. The previously recorded `tupleobject.c(471)` late `b` declaration remains unconfirmed in this run.
- No production or regression edits, no RED/GREEN cycle, and no after-frontier run: stopped at the sandbox/Wine blocker as requested, without bypassing it or reconstructing a harness. No linked DLL/interpreter or runtime evidence.
- Preservation snapshot: `build/manual-20261014-tupleconcat-before/hashes.json` records 190 existing dirty/untracked files plus both Git indexes, excluding ignored generated objects. Final comparison confirmed all 189 unrelated files and both indexes unchanged, tupleobject.c byte-identical, and the complete previous PORT_STATUS.md retained as the suffix after this prepend. Verification: `build/manual-20261014-tupleconcat-before/preservation.txt`. Scoped `git -C cpython diff --check -- Objects/tupleobject.c` and `git diff --check -- PORT_STATUS.md` — exit 0.

Only PORT_STATUS.md was edited; local evidence is under `build/manual-20261014-tupleconcat-before/`. No reset, clean, stash, discard, commit, push, publication, broad patch regeneration, global configuration change, or backup-file operation. Next slice requires a working permitted Wine environment and a fresh frontier before choosing any source edit.

---

## Latest run (`_PyTuple_FromArraySteal()` success-loop C89 index; frontier advances)

Date: 2026-10-14 UTC

Read `PORT_STATUS.md`, `README.md`, and the CPython 3.11.16 Win9x/MSVC6 reference before acting. Preserved existing outer and detached CPython work; no reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. Baseline remains tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

One focused Codex CLI coding lane (`codex-cli 0.153.4`, OpenAI provider, workspace-write/ephemeral; session `01a1383e-4af6-7733-9273-023e090009ed`) used strict TDD for the currently confirmed `_PyTuple_FromArraySteal()` success-path C99 loop index. The focused regression was updated and run before production edits; RED exit 1 on the intended assertion that the success loop must reuse the function-scope `i`. The only production change replaces `for (Py_ssize_t i = 0; ...)` with `for (i = 0; ...)`; loop condition/increment and item assignment/order are unchanged. The next late `PyObject *item` declaration remains untouched. Two directly applicable pre-existing declaration/order tests contained the old loop syntax in their expected full-function text; after the coding lane reported these stale expectations, they were narrowly aligned to the corrected loop. No unrelated paths were changed.

Exact verification:

- Baseline: `git -C cpython describe --tags --exact-match HEAD` → `v3.11.16`; `git -C cpython rev-parse HEAD` → `41388c9cb160d0886d5ca00d2e6c8782608a4549`.
- Before-change forced-fresh command: `mkdir -p build/cron-20261014-run2/runtime && XDG_RUNTIME_DIR="$PWD/build/cron-20261014-run2/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261014-run2/probe.log 2>&1` — exit 2; summary `total=108 compiled=107 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First stable diagnostics at `tupleobject.c(419)` were C2143/C2059 for the success-loop declaration. Capture: `build/cron-20261014-run2/probe.log`.
- TDD RED: `python3 scripts/vc6-tupleobject-from-array-steal-c89.test.py` before source edit — exit 1 with `AssertionError: _PyTuple_FromArraySteal: success loop must reuse function-scope i with assignment`. GREEN after source edit — exit 0.
- Applicable regressions: `python3 scripts/vc6-tupleobject-from-array-steal-c89.test.py` and `for test in scripts/vc6-tupleobject-*.test.py; do python3 "$test"; done` — exit 0; all eight tupleobject tests passed. Scoped `git -C cpython diff --check -- Objects/tupleobject.c` and `git diff --check -- scripts/vc6-tupleobject-from-array-steal-c89.test.py scripts/vc6-tupleobject-from-array-steal-dst-c89.test.py scripts/vc6-tupleobject-from-array-steal-tuple-c89.test.py` — exit 0.
- Post-change forced-fresh command: `mkdir -p build/cron-20261014-run2-after/runtime && XDG_RUNTIME_DIR="$PWD/build/cron-20261014-run2-after/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261014-run2-after/probe.log 2>&1` — exit 2; summary `total=108 compiled=107 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. Former line-419 diagnostics are gone; first remaining tupleobject blocker advances to `tupleobject.c(471)` in `tupleconcat()`, C2275/C2065 on late initialized `PyTupleObject *b = (PyTupleObject *)bb;`. Later independent errors at lines 527+ remain untouched. Capture: `build/cron-20261014-run2-after/probe.log`.
- The Codex hash comparison confirmed only the intended two files changed during its lane and both repository indexes plus unrelated file contents, including `PORT_STATUS.md`, were preserved. Exact source diff and subsequent narrow fixture updates were inspected. No `pythoncore.dll`/`python.exe` link, Wine interpreter execution, or real Windows 98 SE execution occurred; this is compiler-probe progress only.

Files changed by this slice: `cpython/Objects/tupleobject.c` (one loop initializer), `scripts/vc6-tupleobject-from-array-steal-c89.test.py`, and directly applicable expectation updates in `scripts/vc6-tupleobject-from-array-steal-dst-c89.test.py` and `scripts/vc6-tupleobject-from-array-steal-tuple-c89.test.py`, plus this status entry. Next frontier: fresh probe before any edit; if unchanged, isolate only `tupleconcat()`'s late `b` declaration at line 471 with a single strict-TDD slice. No completed port is claimed.

---

## Latest run (fresh tupleobject probe; coding-agent provider unavailable)

Date: 2026-10-14 00:21 UTC

Read `PORT_STATUS.md`, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved all existing outer and detached CPython changes; no reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. CPython baseline remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

Forced-fresh MSVC600/Wine probe shows the status-recorded `_PyTuple_FromArraySteal()` `dst` declaration blocker is stale: the current source already hoists `tuple`, `i`, and `dst`. The actual first remaining blocker in this function is the distinct loop-local `for (Py_ssize_t i = 0; ...)` at line 419, followed by a separate `PyObject *item` declaration at line 420; neither was changed. A focused coding-agent delegation was attempted for the single recorded `dst` slice, but failed before child startup because the Hermes runtime requires the unavailable `anthropic` package and lazy installs are disabled. Therefore this run is diagnostics-only: no TDD RED/GREEN, source/test edit, or implementation claim.

Exact verification:

- Forced-fresh command: `mkdir -p build/cron-20261014-current/runtime && XDG_RUNTIME_DIR="$PWD/build/cron-20261014-current/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261014-current/probe.log 2>&1` — actual probe exit 2; summary `total=108 compiled=107 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First stable tupleobject diagnostics are C2143 at `tupleobject.c(419)` (missing semicolon before `type`, repeated) and C2059 at `(419)` (syntax error `)`), on the loop's late `Py_ssize_t i` declaration. The subsequent `PyObject *item` declaration and other tupleobject diagnostics remain distinct and untouched. Capture: `build/cron-20261014-current/probe.log`.
- Coding-agent prerequisite: `codex --version` → `codex-cli 0.153.4`; `codex login status` → logged in. The requested focused delegation could not start: Hermes delegation returned `anthropic` package required, venv not installed, lazy installs disabled. No child edits occurred.
- Existing regressions: `for test in scripts/vc6-tupleobject-*.test.py; do python3 "$test" || exit "$?"; done` — exit 0; all eight focused tupleobject scripts passed, including the existing `dst` and `tuple` checks.
- Baseline: `git -C cpython describe --tags --exact-match HEAD` → `v3.11.16`; `git -C cpython rev-parse HEAD` → `41388c9cb160d0886d5ca00d2e6c8782608a4549`. Scoped `git -C cpython diff --check -- Objects/tupleobject.c` and `git diff --check -- PORT_STATUS.md` — exit 0.
- No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution was produced. This is probe progress only, not a completed port.

Files changed this run: `PORT_STATUS.md` only; diagnostic capture is under `build/cron-20261014-current/`. Next frontier: once a coding-agent provider can start, use one strict-TDD slice for only the currently confirmed loop index declaration at `_PyTuple_FromArraySteal()` line 419; leave the following `item` declaration separate. No port completion is claimed.

---

## Latest run (`_PyTuple_FromArraySteal()` allocation-failure loop index; frontier advances)

Date: 2026-10-13 20:03 UTC

Read `PORT_STATUS.md`, `README.md`, and the CPython 3.11.16 Win9x/MSVC6 reference before acting. Preserved all pre-existing outer and detached CPython work; no reset, clean, stash, discard, commit, push, publication, or patch regeneration. Baseline remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The status-recorded tuple declaration frontier was stale. Forced-fresh MSVC600/Wine probe compiled `_blake2/blake2s_impl.c`; the recorded `_PyTuple_FromArraySteal()` tuple declaration is already hoisted in the present checkout, so the actual first blocker was its distinct NULL-path loop-index declaration at line 411 (`for (Py_ssize_t i = 0; ...)`). One focused Codex CLI coding lane (`codex-cli 0.153.4`, logged in, workspace-write/ephemeral; session `01a136d7-1fdc-7f83-aef9-dd39ed531458`) used strict TDD. The new focused test failed first on its intended assertion that function-scope `Py_ssize_t i` must precede statements. The sole production edit for this slice hoists `Py_ssize_t i;` into `_PyTuple_FromArraySteal()`'s declaration block and changes only the allocation-failure loop initializer to `i = 0`; the empty-tuple return, allocation, failure test, DECREF loop, and NULL return order are unchanged. The directly related pre-existing `vc6-tupleobject-from-array-steal-tuple-c89.test.py` expectation was updated to encode the new declaration placement and loop form. The later `dst`, success-path loop, and `item` declarations remain untouched. A hash snapshot covered 188 pre-existing dirty/untracked files in both repositories; 186 files outside the two intentionally involved test/source paths remained byte-identical, and the source diff was restricted to this function's index declaration/initializer.

Exact verification:

- Baseline: `git -C cpython describe --tags --exact-match HEAD` → `v3.11.16`; `git -C cpython rev-parse HEAD` → `41388c9cb160d0886d5ca00d2e6c8782608a4549`.
- Before-change forced-fresh command: `mkdir -p build/cron-20261014-reprobe/runtime && XDG_RUNTIME_DIR="$PWD/build/cron-20261014-reprobe/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261014-reprobe/probe.log 2>&1` — actual probe exit 2; summary `total=108 compiled=107 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. The first stable `tupleobject.c` diagnostics were line 411 C2143/C2065 (`i` undeclared), followed by separate `dst`/success-path diagnostics at lines 416-418. Capture: `build/cron-20261014-reprobe/probe.log`.
- TDD RED: `python3 scripts/vc6-tupleobject-from-array-steal-c89.test.py` before the source edit — exit 1 on the intended assertion that function-scope `i` must precede statements. GREEN after edit — exit 0.
- Applicable regressions: `for test in scripts/vc6-tupleobject-*.test.py; do python3 "$test" || exit $?; done` — exit 0; all seven tupleobject tests passed (`alloc`, `dealloc`, `from-array`, `from-array-steal`, `from-array-steal-tuple`, `new`, `pack`). Scoped `git -C cpython diff --check -- Objects/tupleobject.c` and outer `git diff --check` for the two focused tests — exit 0.
- Post-change forced-fresh command: `mkdir -p build/cron-20261014-after/runtime && XDG_RUNTIME_DIR="$PWD/build/cron-20261014-after/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261014-after/probe.log 2>&1` — actual probe exit 2; summary `total=108 compiled=107 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. The former NULL-path loop-index diagnostics are gone. The first remaining errors are now in the same function at line 417 on the distinct late `PyObject **dst` declaration, followed by the independent second loop and item declaration diagnostics at lines 418-420; left untouched. Capture: `build/cron-20261014-after/probe.log`.
- No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution was produced. This is compiler-probe progress only, not port completion.

Files changed by this slice: `cpython/Objects/tupleobject.c` (only the NULL-path loop index declaration split within `_PyTuple_FromArraySteal()`), new `scripts/vc6-tupleobject-from-array-steal-c89.test.py`, updated `scripts/vc6-tupleobject-from-array-steal-tuple-c89.test.py`, and this status entry. Next frontier: force-fresh probe before editing; if unchanged, isolate only `_PyTuple_FromArraySteal()`'s `dst` declaration at line 416/417 in its own TDD slice. Keep the second loop and item declaration separate. Do not claim port completion.

---

## Latest run (forced-fresh frontier; coding lane unavailable)

Date: 2026-10-13 UTC

Read `PORT_STATUS.md`, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved all existing outer and detached CPython work; no reset, clean, stash, discard, commit, push, publication, or patch regeneration. Baseline remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

Forced-fresh probe confirms the recorded tuple frontier had advanced: `_blake2/blake2s_impl.c` compiles, and the first blocker is now `Objects/tupleobject.c:_PyTuple_FromArraySteal()` at line 408 (`PyTupleObject *tuple = tuple_alloc(n)`). VC6 emits C2275/C2065 (`PyTupleObject`/`tuple`); subsequent errors at lines 410 and 415-418 are further declaration families, left untouched. One focused coding-agent delegation was attempted for only this declaration family with strict TDD, but failed before startup because the Anthropic package is unavailable and lazy installs are disabled. Accordingly, this run is diagnostics-only: no source/test edit or TDD cycle is claimed.

Exact verification:

- Forced-fresh command: `mkdir -p build/cron-20261013-current-frontier/runtime && XDG_RUNTIME_DIR="$PWD/build/cron-20261013-current-frontier/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261013-current-frontier/probe.log 2>&1` — actual compiler/probe exit 2. Summary: `total=108 compiled=107 cached=0 skipped=0`; `_blake2/blake2s_impl.c` successfully compiled. First diagnostics: `tupleobject.c(408)` C2275/C2065 (`PyTupleObject`/`tuple`), then line 410 C2143/C2065 `i`; later distinct destination/item declarations follow. Capture: `build/cron-20261013-current-frontier/probe.log`.
- Focused coding-agent delegation — failed before child startup: required `anthropic` package unavailable; lazy installs disabled. No child edits occurred.
- Existing applicable regressions: `for test in scripts/vc6-tupleobject-*.test.py; do python3 "$test" || exit "$?"; done` — exit 0; all five existing tupleobject tests passed. No new test for `_PyTuple_FromArraySteal()` was added.
- `git -C cpython describe --tags --exact-match HEAD` → `v3.11.16`; `git -C cpython rev-parse HEAD` → `41388c9cb160d0886d5ca00d2e6c8782608a4549`. Scoped `git -C cpython diff --check -- Objects/tupleobject.c` and `git diff --check -- PORT_STATUS.md` — exit 0.
- No standalone compiler banner, linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution was produced. This is probe progress only, not port completion.

Files changed this run: `PORT_STATUS.md` only; diagnostic capture is under `build/`. Next frontier: when a coding lane can start, TDD only the line-408 tuple declaration, preserving its evaluation after the `n == 0` return; then run focused VC6 probe and tupleobject regressions. Leave loop and destination declarations separate.

---

## Latest run (`_PyTuple_FromArray()` loop-index declaration; frontier advances)

Date: 2026-10-13 UTC

Read `PORT_STATUS.md`, `README.md`, and the legacy-toolchain CPython reference before acting. Preserved existing outer and detached CPython work; no reset, clean, stash, discard, commit, push, publication, or patch regeneration. Exact CPython baseline remains tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

Forced-fresh MSVC600/Wine probe confirmed the previous destination declaration fix and advanced to the next isolated defect: `_PyTuple_FromArray()`'s C99 loop index declaration at line 392. One focused Codex CLI lane (0.153.4, OpenAI provider, workspace-write/ephemeral; session `01a13575-b737-7212-918b-235d4922a919`) followed strict TDD. It updated the existing focused `scripts/vc6-tupleobject-from-array-c89.test.py`; the RED run failed at the intended assertion because `i` was absent from the declaration block. The only production change hoists `Py_ssize_t i` into that block and changes the loop initializer to `i = 0`. Loop condition/increment, item acquisition, INCREF/store, GC tracking, error/early-return behavior remain unchanged; no other function was changed. No existing changes were reset, cleaned, stashed, discarded, or overwritten. This status file was not touched by the coding lane.

Exact verification:

- Baseline: `git -C cpython describe --tags --exact-match HEAD` → `v3.11.16`; `git -C cpython rev-parse HEAD` → `41388c9cb160d0886d5ca00d2e6c8782608a4549`.
- Before-change forced-fresh: `mkdir -p build/cron-20261013-index-frontier/runtime && XDG_RUNTIME_DIR="$PWD/build/cron-20261013-index-frontier/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261013-index-frontier/probe.log 2>&1` — actual probe exit 2; summary `total=108 compiled=107 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First errors at `tupleobject.c(392)` were C2143 and C2065 `i`; subsequent diagnostics were at distinct locations. Full capture: `build/cron-20261013-index-frontier/probe.log`.
- TDD RED: `python3 scripts/vc6-tupleobject-from-array-c89.test.py` before production edit — exit 1 on expected missing `i` declaration assertion.
- Focused GREEN and applicable regressions: `python3 scripts/vc6-tupleobject-from-array-c89.test.py`; `for test in scripts/vc6-tupleobject-*.test.py; do python3 "$test" || exit "$?"; done` — exit 0; all five tupleobject tests passed.
- Post-change forced-fresh: `mkdir -p build/cron-20261013-index-frontier-after/runtime && XDG_RUNTIME_DIR="$PWD/build/cron-20261013-index-frontier-after/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261013-index-frontier-after/probe.log 2>&1` — actual probe exit 2; summary `total=108 compiled=107 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled and the changed `_PyTuple_FromArray()` passes. Its previous line-392 diagnostics are gone. The first remaining errors advance into the distinct `_PyTuple_FromArraySteal()` function at line 408 (C2275/C2065 `tuple`), followed by its loop `i` declaration and `dst` declaration diagnostics; left untouched. Capture: `build/cron-20261013-index-frontier-after/probe.log`.
- No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution was produced. This is compiler-probe progress only.

Files changed by this slice: `cpython/Objects/tupleobject.c` (only `_PyTuple_FromArray()` loop-index declaration split), `scripts/vc6-tupleobject-from-array-c89.test.py` (focused C89/order expectation), and this status entry. Next frontier: force-fresh probe before editing; if unchanged, isolate only the first `_PyTuple_FromArraySteal()` declaration defect family, leaving its later loop/destination declarations for separate slices. No completed port is claimed.

---

## Latest run (`_PyTuple_FromArray()` destination declaration; frontier advances)

Date: 2026-10-13 UTC

Read `PORT_STATUS.md`, `README.md`, and the CPython 3.11.16 Win9x/MSVC6 reference before acting. Preserved all pre-existing outer and detached CPython work; no reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. CPython remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The previously recorded `_PyTuple_FromArray()` destination declaration frontier was force-reprobed before editing and confirmed: `_blake2/blake2s_impl.c` compiled, then VC6 reported `tupleobject.c(390)` C2275 (`PyObject`), C2065 (`dst`), and C2100. A focused Codex CLI lane (`codex-cli 0.153.4`, OpenAI provider, workspace-write, ephemeral; session `01a134fc-f2d8-7d63-bbf7-7a7decfe9e6c`) used strict TDD. It first updated `scripts/vc6-tupleobject-from-array-c89.test.py`; the test failed before production change with the expected assertion that `dst` must be declared before the empty-tuple check. The sole new production change hoists `PyObject **dst` to `_PyTuple_FromArray()`'s declaration block and assigns `dst = tuple->ob_item` immediately after the successful allocation NULL check. The loop index and item declarations, evaluation/refcount/store/GC order, and error/early-return behavior remain untouched.

Exact verification:

- Before-change forced-fresh command: `mkdir -p build/cron-20261013-refresh/runtime && XDG_RUNTIME_DIR="$PWD/build/cron-20261013-refresh/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261013-refresh/probe.log 2>&1` — probe exit 2; summary `total=108 compiled=107 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First stable diagnostics: `tupleobject.c(390)` C2275/C2065/C2100. Capture: `build/cron-20261013-refresh/probe.log`.
- TDD RED: `python3 scripts/vc6-tupleobject-from-array-c89.test.py` before production edit — exit 1 on the expected missing `dst` declaration assertion. GREEN: same command after edit — exit 0.
- Applicable regressions: `for test in scripts/vc6-tupleobject-*.test.py; do python3 "$test"; done` — exit 0; all five tests (`alloc`, `dealloc`, `from-array`, `new`, `pack`) pass. Scoped `git -C cpython diff --check -- Objects/tupleobject.c` and `git diff --check -- scripts/vc6-tupleobject-from-array-c89.test.py` — exit 0.
- Post-change forced-fresh command: `mkdir -p build/cron-20261013-refresh-after/runtime && XDG_RUNTIME_DIR="$PWD/build/cron-20261013-refresh-after/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261013-refresh-after/probe.log 2>&1` — probe exit 2; summary `total=108 compiled=107 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. Former `_PyTuple_FromArray()` line-390 `dst` diagnostics are gone. The first remaining diagnostics advance to line 392, C2143 and C2065 `i` on the loop's late declaration; later separate tupleobject blockers remain untouched. Capture: `build/cron-20261013-refresh-after/probe.log`.
- Exact CPython tag/commit remain unchanged. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution was produced. This remains compiler-probe progress only.

Files changed by this slice: `cpython/Objects/tupleobject.c` (the `dst` declaration/assignment split only), `scripts/vc6-tupleobject-from-array-c89.test.py` (focused expectation update), and this status entry. Next: force-fresh probe before editing; if unchanged, isolate only the next loop-index declaration in `_PyTuple_FromArray()` at line 392 in its own TDD slice. Do not claim port completion.

---

## Previous run (fresh tuple frontier; coding-agent prerequisite unavailable)

Date: 2026-10-13 UTC

Read `PORT_STATUS.md`, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved all existing outer and detached CPython changes; no reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. CPython remains at exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded `_PyTuple_FromArray()` line-389 frontier was force-reprobed before any coding. It remains the first stable blocker: `_blake2/blake2s_impl.c` compiled, then VC6 reported `tupleobject.c(390)` C2275 (`PyObject`), C2065 (`dst`), and C2100; subsequent line-391 diagnostics are cascades from the same late initialized declaration family. One focused coding-agent delegation was attempted as required for implementation, but failed before child startup because the Hermes runtime has no `anthropic` package and lazy installs are disabled. Consequently this run is diagnostics-only: no TDD RED/GREEN cycle or source/test implementation is claimed. No source work was attempted without the requested coding lane.

Exact verification:

- Forced-fresh command: `mkdir -p build/cron-20261013-current/runtime && XDG_RUNTIME_DIR="$PWD/build/cron-20261013-current/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261013-current/probe.log 2>&1` — actual probe exit 2; summary `total=108 compiled=107 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First stable diagnostics at `cpython\\Objects\\tupleobject.c(390)`: C2275, C2065 `dst`, C2100; cascades follow at line 391. Full capture: `build/cron-20261013-current/probe.log`.
- Focused coding-agent delegation — failed before child startup: missing `anthropic`; lazy installs disabled. No child edits occurred.
- Applicable existing tupleobject regression suite: `for test in scripts/vc6-tupleobject-*.test.py; do python3 "$test" || exit "$?"; done` — exit 0; all five tests pass (`alloc`, `dealloc`, `from-array`, `new`, `pack`). These are pre-existing tests; no new TDD cycle was performed.
- `git -C cpython diff --check -- Objects/tupleobject.c` and `git diff --check -- PORT_STATUS.md` — exit 0. Baseline tag/commit verified unchanged.
- No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution was produced. This remains compiler-probe progress only.

Files changed this run: `PORT_STATUS.md` only. `build/cron-20261013-current/probe.log` is a diagnostic artifact. Next frontier: resolve the coding-agent provider prerequisite, then use one strict-TDD slice for only `_PyTuple_FromArray()`'s `dst` declaration, preserving its evaluation point after successful tuple allocation; rerun the focused VC6 probe and applicable regression suite. Leave the subsequent loop declaration and other tupleobject blockers separate.

---

## Latest run (`_PyTuple_FromArray()` first declaration hoisted; frontier advances)

Date: 2026-10-13 UTC

Read `PORT_STATUS.md`, `README.md`, and the CPython 3.11.16 Win9x/MSVC6 reference before acting. Preserved all pre-existing root and detached CPython work; no reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. CPython remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded tupleobject frontier was force-reprobed before editing and confirmed: `_blake2/blake2s_impl.c` compiled, then `Objects/tupleobject.c(385)` failed on the late initialized `PyTupleObject *tuple` declaration (C2275/C2065). One focused Codex CLI lane (`codex-cli 0.153.4`, logged in, workspace-write/ephemeral) implemented only this declaration family using TDD. The new regression's RED failed with the expected assertion before the production change. The edit hoists `PyTupleObject *tuple;`, assigning `tuple = tuple_alloc(n);` at the original point after the `n == 0` early return. Distinct `dst`, `i`, and `item` declarations and all operation/refcount/error order remain unchanged. The coding lane's preservation snapshot covered 4,804 paths across both repositories; only the intended CPython source and new focused test differ. No unrelated existing modifications were changed.

Exact verification:

- Before-change forced-fresh command: `XDG_RUNTIME_DIR="$PWD/build/cron-current-reprobe/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-current-reprobe/probe.log 2>&1` — actual probe exit 2; summary `total=108 compiled=107 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First diagnostics: `tupleobject.c(385)` C2275 (`PyTupleObject`) and C2065 (`tuple`); later distinct declarations at lines 389-390 remain. Capture: `build/cron-current-reprobe/probe.log`.
- TDD RED/GREEN: `python3 scripts/vc6-tupleobject-from-array-c89.test.py` — exit 1 before the production edit at the intended declaration-order assertion, then exit 0 after it.
- Applicable regressions: `for test in scripts/vc6-tupleobject-*.test.py; do python3 "$test" || exit $?; done` — exit 0; all five tupleobject scripts pass, including `_PyTuple_FromArray()`.
- Initial post-change forced-fresh attempt in the coding lane exited 1 before compilation because Wine failed to create a lock under `/run/user/1000` (`Read-only file system`). Wine smoke check `XDG_RUNTIME_DIR="$PWD/build/cron-current-coder/retry-runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all wine cmd /c ver` then exited 0 (`Microsoft Windows 10.0.19043`). Retried the forced-fresh command using that project-local runtime and captured `build/cron-current-coder/probe-retry.log`; actual probe exit 2; summary `total=108 compiled=107 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled, and the former line-385 errors are gone. The next first blocker is `tupleobject.c(390)` C2275/C2065 (`PyObject`/`dst`); other separate tupleobject blockers remain untouched.
- `git -C cpython diff --check -- Objects/tupleobject.c` and `git diff --check -- PORT_STATUS.md scripts/vc6-tupleobject-from-array-c89.test.py` — exit 0. Exact baseline tag/commit verified unchanged. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution was produced. This is compiler-probe progress only.

Files changed by this slice: `cpython/Objects/tupleobject.c` (one declaration/assignment split), new `scripts/vc6-tupleobject-from-array-c89.test.py`, and this status entry. Next: force-fresh probe before editing; if unchanged, address only the next first blocker in `_PyTuple_FromArray()` (`dst` at line 389), in a separate TDD slice. Do not claim a completed port.

---

## Previous run (fresh tupleobject frontier re-probe; no coding agent available)

Date: 2026-10-13 UTC

Read `PORT_STATUS.md`, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved all pre-existing root and detached CPython work; no reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. Exact CPython baseline remains tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

Forced-fresh MSVC600/Wine re-probe confirms the recorded `_PyTuple_FromArray()` frontier at line 385 remains the first stable blocker. A focused coding-agent lane was not started: `codex-cli 0.153.4` is installed, but the required delegation tool/provider is not available to this scheduled runtime. Per the workflow, this is diagnostics-only: no source or test edits and no TDD cycle are claimed. The subsequent declaration families at lines 389-390 and other tupleobject functions remain distinct and untouched.

Exact verification:

- `XDG_RUNTIME_DIR="$PWD/build/cron-20261013T-run/reprobe/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261013T-run/reprobe/probe.log 2>&1` — actual probe exit 2; summary `total=108 compiled=107 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First diagnostics: `Objects/tupleobject.c(385)` C2275 (`PyTupleObject`) and C2065 (`tuple`). Later same-function errors at lines 389-390 and separate tupleobject blockers follow. Capture: `build/cron-20261013T-run/reprobe/probe.log`.
- Baseline verified: `git -C cpython describe --tags --exact-match HEAD` → `v3.11.16`; `git -C cpython rev-parse HEAD` → `41388c9cb160d0886d5ca00d2e6c8782608a4549`.
- No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution was produced. This is compiler-probe progress only.

Files changed this run: `PORT_STATUS.md` only. Next: delegate one isolated TDD slice for `_PyTuple_FromArray()`'s declaration at line 385 once the coding-agent lane is available; preserve evaluation timing and leave the distinct declarations at 389-390 untouched. No completed port is claimed.

---

## Previous latest run (`tupledealloc()` C89 index declaration; frontier advances)

Date: 2026-10-13 UTC

Read `PORT_STATUS.md`, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved all pre-existing root and detached CPython work; no reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. CPython remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

Forced-fresh MSVC600/Wine source-list probe confirmed the recorded tupleobject frontier had advanced beyond `PyTuple_New()`: `_blake2/blake2s_impl.c` compiled, and the first stable blocker was the late initialized `Py_ssize_t i` in `tupledealloc()` after `Py_TRASHCAN_BEGIN`. One focused Codex CLI lane (`codex-cli 0.153.4`, OpenAI provider, workspace-write/ephemeral; session `01a13321-82e3-7b70-9085-e1247494109e`) used strict TDD. New `scripts/vc6-tupleobject-dealloc-c89.test.py` failed before the production edit with the expected assertion that `i` must be declared before the initial empty-tuple checks. The sole production change declares `i` at function entry and retains `i = Py_SIZE(op);` immediately after `Py_TRASHCAN_BEGIN`; decref, freelist/free, and trashcan ordering are unchanged. The lane captured hashes for all pre-existing dirty/untracked paths in both repositories and verified they remained byte-identical; only the intended CPython edit and new test were added.

Exact verification:

- Before-change forced-fresh command: `XDG_RUNTIME_DIR="$PWD/build/cron-20261013T-current/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — actual probe exit 2; summary `total=108 compiled=107 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First stable errors: `tupleobject.c(209)` C2143 and `(210)` C2065 `i`; subsequent independent errors included `tuplerepr` line 221 and later tupleobject functions. Full capture: `build/cron-20261013T-current/probe.log`.
- TDD RED: `python3 scripts/vc6-tupleobject-dealloc-c89.test.py` before production edit — exit 1 on the intended declaration-placement assertion. GREEN: same command after edit — exit 0.
- Applicable regression loop: `for test in scripts/vc6-tupleobject-*.test.py; do python3 "$test" || exit "$?"; done` — exit 0; all four scripts (`alloc`, `dealloc`, `new`, `pack`) pass. Scoped `git -C cpython diff --check -- Objects/tupleobject.c` and `git diff --check -- scripts/vc6-tupleobject-dealloc-c89.test.py` — both exit 0. Diff/snapshot inspection confirms the only production changes are the intended declaration/assignment split and all pre-existing work was preserved.
- Post-change forced-fresh command: `XDG_RUNTIME_DIR="$PWD/build/cron-20261013T-post/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — actual probe exit 2; summary `total=108 compiled=107 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. The former `tupledealloc()` line-209/210 diagnostics are gone. First remaining errors advance to `Objects/tupleobject.c(385)` C2275/C2065 on the late initialized `PyTupleObject *tuple` in `_PyTuple_FromArray()`; separate later C89 declarations in that function and other tupleobject functions remain untouched. Full capture: `build/cron-20261013T-post-probe.log`.
- Exact baseline tag/commit verified unchanged. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution was produced. This is compiler-probe progress only.

Files changed by this slice: `cpython/Objects/tupleobject.c` (only `tupledealloc()` index declaration split), new `scripts/vc6-tupleobject-dealloc-c89.test.py`, and this status entry. Next frontier: force-fresh probe before editing; if unchanged, isolate the first `_PyTuple_FromArray()` blocker at line 385 in its own TDD slice. No completed port is claimed.

---

## Latest run (`PyTuple_New()` C89 loop declaration; frontier advances)

Date: 2026-10-12 17:58 UTC

Read `PORT_STATUS.md`, `README.md`, and the CPython 3.11.16 Win9x/MSVC6 skill reference before acting. Preserved pre-existing root and detached CPython work; no reset, clean, stash, discard, commit, push, publication, or patch regeneration. CPython remains at exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The previously recorded tupleobject frontier was force-reprobed. `_blake2/blake2s_impl.c` compiled, and the prior `PyTuple_New()` C99 loop declaration at line 80 is confirmed as the first blocker. One focused Codex CLI lane (`codex-cli 0.153.4`, session `01a13148-65d0-7250-a18e-5b4a768dcaa8`) followed TDD. New `scripts/vc6-tupleobject-new-c89.test.py` failed before the source edit (exit 1) on the intended declaration assertion. The sole source change hoists `Py_ssize_t i` into the declaration block and changes only the `for` initializer to assign `i = 0`; iteration and tuple initialization order remain unchanged. Both tupleobject-specific regression scripts pass. The child’s first probe attempt exited 1 before compilation due Wine server lock creation; Hermes independently reran the forced-fresh probe with a fresh project-local runtime directory.

Exact verification:

- Before-change forced-fresh command: `XDG_RUNTIME_DIR="$PWD/build/cron-20261012T175809Z/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2; `total=108 compiled=107 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First stable errors were the recorded `tupleobject.c(80)` C2143/C2065/C2059 family.
- TDD RED: `python3 scripts/vc6-tupleobject-new-c89.test.py` — exit 1, intended assertion on missing function-scope `i` declaration.
- TDD GREEN and focused regressions: `for test in scripts/vc6-tupleobject-*.test.py; do python3 "$test"; done` — both `vc6-tupleobject-alloc-c89.test.py` and `vc6-tupleobject-new-c89.test.py` exit 0. A snapshot diff confirmed no tupleobject changes outside this function; `PORT_STATUS.md` checksum was unchanged during coding.
- Post-change forced-fresh command: `XDG_RUNTIME_DIR="$PWD/build/cron-20261012T175809Z-after/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2; `total=108 compiled=107 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled and the `PyTuple_New()` line-80 diagnostics are gone. The next first errors are `Objects/tupleobject.c(168)` C2275/C2065 on late-initialized `PyTupleObject *result` in `PyTuple_Pack()`; later independent tupleobject errors remain untouched. Full before/after captures: `build/cron-20261012T175809Z/probe.log` and `build/cron-20261012T175809Z-after/probe.log`.
- The exact baseline tag/commit remains unchanged. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution was produced. This is compiler-probe progress only.

Files changed by this slice: `cpython/Objects/tupleobject.c` (the `PyTuple_New()` loop index declaration only), new `scripts/vc6-tupleobject-new-c89.test.py`, and this status entry. Next: force-fresh probe before edits, then consider only the newly confirmed `PyTuple_Pack()` declaration at line 168 in a separate TDD slice; keep later blockers separate. No completed port is claimed.

---

## Latest run (tupleobject frontier reconfirmed; coding lane unavailable)

Date: 2026-10-12 13:36 UTC

Read `PORT_STATUS.md`, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved pre-existing outer and detached CPython changes. No reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. CPython baseline remains tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded `tuple_alloc()` frontier was force-reprobed before any edits and remains current. `_blake2/blake2s_impl.c` compiles. The first stable errors are `Objects/tupleobject.c(43)` C2275 (`PyTupleObject`) and C2065 (`op`) on `PyTupleObject *op = maybe_freelist_pop(size);`. Distinct later diagnostics include a C99 loop declaration at line 79 and further tupleobject issues; none were changed. One focused coding-agent delegation was attempted for only line 43, but failed before child startup because the Hermes runtime requires the unavailable `anthropic` Python package and lazy installs are disabled. Thus this was diagnostics-only: no TDD RED/GREEN cycle, source/test changes, or regression tests are claimed.

Exact verification:

- `mkdir -p build/cron-20261012T133609Z/runtime && XDG_RUNTIME_DIR="$PWD/build/cron-20261012T133609Z/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261012T133609Z/probe.log 2>&1` — probe exit 2; summary `total=108 compiled=107 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First diagnostics: `tupleobject.c(43)` C2275/C2065; separate line-79 C2143/C2065/C2059 diagnostics follow. Full log: `build/cron-20261012T133609Z/probe.log`.
- `git -C cpython describe --tags --exact-match HEAD` → `v3.11.16`; `git -C cpython rev-parse HEAD` → `41388c9cb160d0886d5ca00d2e6c8782608a4549`.
- Focused coding delegation — failed before child startup: missing `anthropic`; lazy installs disabled. No child edits or test runs occurred.
- No standalone compiler banner was captured. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution was produced.

Files changed this run: `PORT_STATUS.md` only. This is compiler-probe progress only; no port completion is claimed. Next: retry the single TDD slice for `tuple_alloc()` line 43 when a coding-agent provider can start, preserving the `maybe_freelist_pop(size)` evaluation point; keep line 79 and later tupleobject blockers separate.

---

## Previous run (tupleobject frontier reconfirmed; coding lane unavailable)

Date: 2026-10-12 UTC

Read `PORT_STATUS.md`, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved all pre-existing outer and detached CPython changes. No reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. CPython baseline remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded structseq frontier was force-reprobed before editing. `_blake2/blake2s_impl.c` and `Objects/structseq.c` compile; the current first blocker is `Objects/tupleobject.c:tuple_alloc()` at line 43, on the late initialized declaration `PyTupleObject *op = maybe_freelist_pop(size);`. One focused coding-subagent delegation was attempted for this single declaration family using installed `codex-cli 0.153.4`, but failed before child startup because the Hermes runtime requires the unavailable `anthropic` Python package and lazy installs are disabled. No source/test change or TDD RED/GREEN cycle was made; this run is diagnostics-only. The existing changes and subsequent tupleobject diagnostics were left untouched.

Exact verification:

- `mkdir -p build/cron-20261012Tcurrent-reprobe/runtime && XDG_RUNTIME_DIR="$PWD/build/cron-20261012Tcurrent-reprobe/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261012Tcurrent-reprobe/probe.log 2>&1` — actual probe exit 2; summary `total=108 compiled=107 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First stable errors: `tupleobject.c(43)` C2275 (`PyTupleObject`) and C2065 (`op`), with cascading warnings. The next distinct diagnostics include line 79; later errors in that file were not addressed. Full capture: `build/cron-20261012Tcurrent-reprobe/probe.log`.
- `git -C cpython describe --tags --exact-match HEAD` → `v3.11.16`; `git -C cpython rev-parse HEAD` → `41388c9cb160d0886d5ca00d2e6c8782608a4549`. Outer and detached repository pre-existing changes were present and preserved.
- Focused coding-agent delegation — failed before child startup: `anthropic` package unavailable; lazy installs disabled. No child edits or tests occurred. No focused tupleobject regression script exists in `scripts/` at this time.
- No standalone compiler banner was captured. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution was produced.

Files changed this run: `PORT_STATUS.md` only. Compiler-probe progress only; no port completion is claimed. Next: retry one focused TDD coding lane for only the `tuple_alloc()` declaration at line 43 once the coding-agent provider can start; preserve the `maybe_freelist_pop(size)` evaluation point and leave the distinct line-79 and later tupleobject blockers separate.

---

## Latest run (`_PyStructSequence_NewType()` C89 slot initialization; frontier advances)

Date: 2026-10-12 UTC

Read `PORT_STATUS.md`, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved all pre-existing outer and detached CPython changes; no reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. Exact CPython baseline remains tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded structseq designated-initializer frontier was first force-reprobed. Initial invocation failed before compilation because Wine could not create its server lock (`/run/user/1000/wine/server-801-136fb0/lock`); `wine cmd /c ver` then succeeded when run with a project-local `XDG_RUNTIME_DIR`. The exact forced-fresh probe was retried successfully. `_blake2/blake2s_impl.c` compiled; the prior `structseq.c` designated-initializer C2059 diagnostics at lines 590-597 were current. One focused Codex CLI implementation lane (codex-cli 0.153.4, session `01a12f6b-00a0-78a3-95e0-f1c894f09703`, workspace-write/ephemeral) followed test-first workflow. New `scripts/vc6-structseq-newtype-slots-c89.test.py` failed before the source change on the compound literals. The production change replaced only eight compound-literal assignments with `.slot` and `.pfunc` field assignments; slot values, order, casts, and zero sentinel are preserved. `PyStructSequence_NewType()` and all other source regions were left unchanged. Independent baseline hash check captured 4,799 tracked/untracked files across both repos before coding and verified all previously existing file contents remained unchanged except the intended `cpython/Objects/structseq.c` edit; `PORT_STATUS.md` was not edited by the coding lane.

Exact verification:

- Initial forced-fresh command at `build/cron-20261012T-current`: exit 2; `total=107 compiled=106 cached=0 skipped=0`, `_blake2/blake2s_impl.c` compiled. First stable errors were `Objects/structseq.c(590-597)` C2059 on the compound-literal braces; separate later errors were in `PyStructSequence_NewType()` at lines 624-626. Capture: `build/cron-20261012T-current/probe.log`.
- TDD RED: `python3 scripts/vc6-structseq-newtype-slots-c89.test.py` before production edit — exit 1 with the intended assertion rejecting compound literals. GREEN: same command after edit — exit 0; exact eight slot pairs and ordering verified.
- Focused regressions: `for test in scripts/vc6-structseq-*.test.py; do python3 "$test" cpython/Objects/structseq.c || exit; done` — all nine scripts exited 0. Host `python3 cpython/Lib/test/test_structseq.py` — 17 tests, exit 0; `python3 cpython/Lib/test/_test_embed_structseq.py` — 2 tests, exit 0. These host tests do not compile or execute the edited C source.
- Scoped whitespace checks: `git -C cpython diff --check -- Objects/structseq.c` and `git diff --check -- scripts/vc6-structseq-newtype-slots-c89.test.py` — both exit 0. Byte/hash comparison confirmed only the intended slot initialization changed among pre-existing paths.
- Post-change forced-fresh command: `mkdir -p build/cron-20261012T-current-post/runtime && XDG_RUNTIME_DIR="$PWD/build/cron-20261012T-current-post/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261012T-current-post/probe.log 2>&1` — actual probe exit 2; summary `total=108 compiled=107 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. Former `structseq.c` designated-initializer diagnostics are gone; the first stable blocker advances to `Objects/tupleobject.c` beginning at line 43 (C2275/C2065 declaration diagnostics), with further C89 declaration/initializer diagnostics later in that file. Capture: `build/cron-20261012T-current-post/probe.log`.
- Exact CPython tag and commit verified unchanged. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution was produced. This is compiler-probe progress only.

Files changed by this slice: `cpython/Objects/structseq.c` (only `_PyStructSequence_NewType()` slot assignments), new `scripts/vc6-structseq-newtype-slots-c89.test.py`, and this status entry. Next: force-fresh probe before editing, then address only the newly confirmed first `Objects/tupleobject.c` blocker in a separate TDD slice; leave subsequent tupleobject diagnostics separate. No port completion is claimed.

---

## Previous run (`initialize_structseq_dict()` C89 declaration family; frontier advances)

Date: 2026-10-12 07:15 UTC

Read `PORT_STATUS.md`, `README.md`, and the applicable CPython 3.11.16 Win9x/MSVC6 reference before acting. Preserved all existing root and detached CPython modifications; no reset, clean, stash, discard, commit, push, publication, or patch regeneration. CPython baseline remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The previously recorded frontier was force-reprobed before editing. `_blake2/blake2s_impl.c` compiled. The first stable MSVC600/Wine diagnostics were in `Objects/structseq.c:initialize_structseq_dict()` at line 408 (C2143), line 409 (C2275/C2065 for `keys`), and line 414 (undeclared `i`/`k`), with a separate late `new_member` declaration at line 418. One focused Codex CLI coding lane (`codex-cli 0.153.4`, OpenAI, workspace-write/ephemeral; session `01a12ef1-6c60-78d2-bb6f-769f8a2e7a91`) followed TDD. New `scripts/vc6-structseq-initialize-structseq-dict-c89.test.py` failed before production edits as expected on the declaration placements. The lane hoisted only `i`, `k`, and uninitialized `keys` to the function declaration block and `new_member` to the loop's declaration block; tuple and Unicode allocation calls remain at their original execution points. Metadata writes, checks, `continue`, reference handling, resize, insertion, and cleanup order are preserved. Snapshot verification found all 179 pre-existing changed/untracked files unchanged, `PORT_STATUS.md` untouched during coding, and source outside this function unchanged.

Exact verification:

- Before-change forced-fresh command: `mkdir -p build/cron-20261012T-current/runtime && XDG_RUNTIME_DIR="$PWD/build/cron-20261012T-current/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261012T-current/probe.log 2>&1` — actual probe exit 2; summary `total=107 compiled=106 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First errors: `structseq.c(408)` C2143, `(409)` C2275/C2065 (`PyObject`/`keys`), `(414)` C2065 (`i`/`k`); independent later declaration errors at `(418-419)` and designated-initializer C2059 at `(588-595)`. Capture: `build/cron-20261012T-current/probe.log`.
- TDD RED: `python3 scripts/vc6-structseq-initialize-structseq-dict-c89.test.py` before source edit — exit 1, expected failure on late declarations. GREEN — exit 0.
- Focused and all `scripts/vc6-structseq-*.test.py`: exit 0 for all eight tests (dealloc, initialize-structseq-dict, new, repr, repr-name, repr-name-utf8, repr-value-repr, traverse). `git -C cpython diff --check -- Objects/structseq.c` and `git diff --check -- PORT_STATUS.md scripts/vc6-structseq-initialize-structseq-dict-c89.test.py` — exit 0. The new-file `git diff --no-index --check /dev/null ...` returns 1 because it signals differing content, with no diagnostics; not counted as a pass.
- Post-change forced-fresh command: `mkdir -p build/cron-20261012T-current-post/runtime && XDG_RUNTIME_DIR="$PWD/build/cron-20261012T-current-post/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261012T-current-post/probe.log 2>&1` — actual probe exit 2; summary remains `total=107 compiled=106 cached=0 skipped=0`; `_blake2/blake2s_impl.c` and `structseq.c` compiled. The former line-408/409/414/418 declaration diagnostics are gone. The next first compiler diagnostics are C2059 designated-initializer errors at `structseq.c(590-597)`; later `PyStructSequence_NewType` diagnostics at `(624-627)` remain separate. Capture: `build/cron-20261012T-current-post/probe.log`.
- Exact CPython tag/commit verified unchanged. The MSVC environment invocation did not yield a standalone compiler banner. No `pythoncore.dll`/`python.exe` link, Wine interpreter run, or real Windows 98 SE execution was produced. This is compiler-probe progress only, not a completed port.

Files changed by this slice: `cpython/Objects/structseq.c` (declaration placement only within `initialize_structseq_dict()`), new `scripts/vc6-structseq-initialize-structseq-dict-c89.test.py`, and this status entry. Next: force-fresh probe first, then isolate only the current `structseq.c` designated-initializer family at lines 590-597 in a separate TDD slice. Leave the later `PyStructSequence_NewType` blocker untouched.

---

## Latest run (`structseq_repr()` value/repr C89 declarations; frontier advances)

Date: 2026-10-12 05:02 UTC

Read `PORT_STATUS.md`, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved all existing outer and detached CPython work; no reset, clean, stash, discard, commit, push, publication, or patch regeneration. CPython baseline remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The previously recorded frontier was force-reprobed before changes. `_blake2/blake2s_impl.c` compiled; the first blocker remained `Objects/structseq.c:structseq_repr()` at lines 296 and 298, where late `PyObject *value` and `PyObject *repr` declarations produce C2275/C2065. One focused Codex CLI coding lane (`codex-cli 0.153.4`, OpenAI provider, workspace-write/ephemeral; session `01a12e78-6932-7e01-bb77-3fb2d756177c`) followed TDD. New `scripts/vc6-structseq-repr-value-repr-c89.test.py` failed before production edits as expected because the declarations were not in the function declaration block. The lane hoisted only `value` and `repr`; assignments remain immediately after `=` output and after borrowed value lookup, respectively. Refcount, error, evaluation, and output order are unchanged. Updated the directly applicable existing `vc6-structseq-repr-name-c89.test.py` source expectation from declaration-with-initializer to the equivalent assignment.

Exact verification:

- Before-change forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/cron-20261012T-run/probe-before/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261012T-run/probe-before.log 2>&1` — actual probe exit 2; summary `total=107 compiled=106 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First errors: C2275/C2065 at `structseq.c(296)` for `value` and `(298)` for `repr`, with cascading warnings. Capture: `build/cron-20261012T-run/probe-before.log`.
- TDD RED: `python3 scripts/vc6-structseq-repr-value-repr-c89.test.py` before production edit — exit 1, expected assertion that `value` and `repr` must be declared in the function entry declaration block.
- Focused GREEN and all applicable structseq regressions: `for test in scripts/vc6-structseq-*.test.py; do python3 "$test"; done` — all seven tests exit 0: dealloc, new, repr loop, repr name, repr name UTF-8, new value/repr regression, and traverse. Nested and outer scoped `git diff --check` — exit 0.
- Post-change forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/cron-20261012T-run/probe-after/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261012T-run/probe-after.log 2>&1` — actual probe exit 2; summary remains `total=107 compiled=106 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. The previous `structseq_repr()` diagnostics at 296/298 are gone. First remaining errors advance to `structseq.c(408)` C2143, then C2275/C2065 for `keys` at `(409)` and undeclared `i`/`k` at `(414)`; later independent `new_member` declaration errors at `(418-419)`, designated initializers `(588-595)`, and additional errors remain untouched. Capture: `build/cron-20261012T-run/probe-after.log`.
- Exact baseline tag/commit verified unchanged. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution was produced.

Files changed by this slice: `cpython/Objects/structseq.c`, `scripts/vc6-structseq-repr-value-repr-c89.test.py` (new), `scripts/vc6-structseq-repr-name-c89.test.py` (updated), and this status entry. Compiler-probe progress only, not a completed port. Next: force-fresh probe before editing; if unchanged, isolate only the current `structseq.c` declaration family beginning at line 408. Do not combine the later `new_member` declaration or designated-initializer blockers.

---

## Previous run (`structseq_repr()` loop-local name declaration; frontier advances)

Date: 2026-10-12 UTC

Read `PORT_STATUS.md`, `README.md`, and the CPython 3.11.16 Win9x/MSVC6 reference before acting. Preserved all existing outer and detached CPython work; no reset, clean, stash, discard, commit, push, publication, or patch regeneration. Baseline remains exact CPython tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

Forced-fresh MSVC600/Wine reprobe confirmed the recorded frontier. `_blake2/blake2s_impl.c` compiled. First stable diagnostics were C2275/C2065 at `Objects/structseq.c(281)` on the late `PyObject *name`; later diagnostics in this file included `value` at `(295)`, `repr` at `(297)`, declaration families at `(405-416)`, designated initializers at `(585-592)`, and additional later errors. One focused Codex CLI lane (`codex-cli 0.153.4`, OpenAI provider, workspace-write/ephemeral; session `01a12dfe-caaa-71a2-a2d7-4885dc081db2`) used strict TDD. New `scripts/vc6-structseq-repr-name-c89.test.py` failed before production edits with the expected assertion that `name` must be declared at the start of the loop body. The sole production change hoists `PyObject *name;` alongside `name_utf8` and changes the original declaration-with-initializer into an assignment at its original point, preserving decoding, error handling, reference counts, and operation order. Updated the directly applicable existing `vc6-structseq-repr-name-utf8-c89.test.py` assertion to reflect the new legal declaration and unchanged assignment order.

Exact verification:

- Before-change forced-fresh command: `XDG_RUNTIME_DIR="$PWD/build/cron-20261012T-current/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261012T-current/probe.log 2>&1` — actual probe exit 2; summary `total=107 compiled=106 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First stable errors: C2275/C2065 at `structseq.c(281)`; later independent errors as listed above. An initial invocation exited 1 before probing because the output directory did not exist; the logged command succeeded after creating it. Capture: `build/cron-20261012T-current/probe.log`.
- TDD RED: `python3 scripts/vc6-structseq-repr-name-c89.test.py` before production edit — exit 1 at the intended assertion that `name` must be declared before loop-body statements.
- Focused and all applicable `structseq` regressions: `for test in scripts/vc6-structseq-*.test.py; do python3 "$test"; ...; done` — all six scripts exit 0: `dealloc`, `new`, `repr`, `repr-name`, `repr-name-utf8`, and `traverse`. The existing name-UTF8 test was updated because its prior assertion encoded the now-fixed declaration layout; it passes unchanged behavioral/order checks with the hoisted declaration.
- Post-change forced-fresh command: `XDG_RUNTIME_DIR="$PWD/build/cron-20261012T-post/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261012T-post/probe.log 2>&1` — actual probe exit 2; summary `total=107 compiled=106 cached=0 skipped=0`. The former `name` diagnostics at line 281 are gone. First remaining `structseq.c` diagnostics advance to C2275/C2065 at `(296)` for `value` and `(298)` for `repr`; later errors include declaration families at `(406-417)`, designated initializers `(586-593)`, and additional blockers. Capture: `build/cron-20261012T-post/probe.log`.
- `git diff --check -- PORT_STATUS.md scripts/vc6-structseq-repr-name-c89.test.py scripts/vc6-structseq-repr-name-utf8-c89.test.py` and `git -C cpython diff --check -- Objects/structseq.c` — exit 0. CPython tag and commit verified unchanged. The compiler output did not provide a standalone banner. No linked `pythoncore.dll`/`python.exe`, Wine interpreter run, or real Windows 98 SE execution was produced.

Files changed by this slice: `cpython/Objects/structseq.c` (only the `name` declaration/assignment split), new `scripts/vc6-structseq-repr-name-c89.test.py`, updated `scripts/vc6-structseq-repr-name-utf8-c89.test.py`, and this status entry. Compiler-probe progress only, not a completed port. Next: force-fresh probe before edits; if unchanged, isolate only the first remaining `structseq_repr()` declaration family (`value` / `repr`) as a separate TDD slice. Do not combine the later `initialize_structseq_dict()` or static initializer blockers.

---

## Previous run (`structseq_repr()` loop-local name declaration; frontier advances)

Date: 2026-10-12 UTC

Read `PORT_STATUS.md`, `README.md`, and the CPython 3.11.16 Win9x/MSVC6 reference before acting. Preserved all pre-existing outer and detached CPython work; no reset, clean, stash, discard, commit, push, publication, or patch regeneration. CPython baseline remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded `_blake2`/`structseq.c` frontier was force-reprobed before editing. `_blake2/blake2s_impl.c` compiled; the first stable diagnostics were C2143 at `Objects/structseq.c(273)` before `const`, then C2065 `name_utf8` at `(274)`. One focused Codex CLI lane (`codex-cli 0.153.4`, OpenAI provider, workspace-write/ephemeral; session `01a12d85-f68c-7213-9d0e-1443aa553b25`) used strict TDD. New `scripts/vc6-structseq-repr-name-utf8-c89.test.py` failed before production edits with expected assertion that `name_utf8` must be declared before loop-body statements. The sole production change declares `const char *name_utf8;` at the top of the `for` body and leaves `name_utf8 = typ->tp_members[i].name;` at its original point, after separator output. NULL checking, error handling, and decode order remain unchanged. The lane's byte-hash check confirmed all 175 other pre-existing dirty files, including this status file, remained unchanged during implementation.

Exact verification:

- Before-change forced-fresh command: `XDG_RUNTIME_DIR="$PWD/build/cron-20261012T002656Z/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261012T002656Z/probe.log 2>&1` — actual probe exit 2; summary `total=107 compiled=106 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First stable diagnostics: C2143 at `structseq.c(273)` and C2065 `name_utf8` at `(274)`. Capture: `build/cron-20261012T002656Z/probe.log`.
- TDD RED: `python3 scripts/vc6-structseq-repr-name-utf8-c89.test.py` before production edit — exit 1, expected assertion `VC6 requires name_utf8 declared before loop-body statements`.
- GREEN and all `scripts/vc6-structseq-*.test.py`: exit 0 for `dealloc`, `new`, `repr`, new `repr-name-utf8`, and `traverse`. Byte-preservation and exact-source-diff verification — exit 0 (175 other pre-existing dirty files unchanged; source contains only the intended declaration/assignment transformation).
- Post-change forced-fresh command: `XDG_RUNTIME_DIR="$PWD/build/cron-20261012T002656Z-post/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261012T002656Z-post/probe.log 2>&1` — actual probe exit 2; summary `total=107 compiled=106 cached=0 skipped=0`. `_blake2/blake2s_impl.c` still compiles; the former diagnostics at lines 273-274 are gone. First remaining diagnostics advance to `Objects/structseq.c(281)` C2275 `PyObject` / C2065 `name`; independent later diagnostics include `(295)` `value`, `(297)` `repr`, `(405-416)` declaration families, designated initializer C2059 at `(585-592)`, and later errors. Capture: `build/cron-20261012T002656Z-post/probe.log`.
- `git -C cpython describe --tags --exact-match HEAD` → `v3.11.16`; `git -C cpython rev-parse HEAD` → `41388c9cb160d0886d5ca00d2e6c8782608a4549`. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution was produced. This is compiler-probe progress only, not a completed port.

Files changed this slice: `cpython/Objects/structseq.c` (one loop-local declaration split), new `scripts/vc6-structseq-repr-name-utf8-c89.test.py`, and this status entry. Next: force-fresh probe before edits; if unchanged, isolate only the first `structseq_repr()` late `PyObject *name` declaration at line 281 as a separate TDD slice. Do not combine the later `value`, `repr`, API, or initializer blockers.

---

## Latest run (`structseq_dealloc()` C89 declaration; frontier advances)

Date: 2026-10-11 UTC

Read `PORT_STATUS.md`, `README.md`, and the CPython 3.11.16 Win9x/MSVC6 reference before acting. Preserved all existing outer and detached CPython work; no reset, clean, stash, discard, commit, push, publication, or patch regeneration. Baseline remains exact CPython tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The status-recorded `_blake2` frontier was stale. A forced-fresh MSVC600/Wine probe compiled `_blake2/blake2s_impl.c`; the first blocker was `Objects/structseq.c:structseq_dealloc()` at line 109, a late initialized `PyTypeObject *tp = Py_TYPE(obj);` declaration. One focused Codex CLI lane (`codex-cli 0.153.4`, session `01a12c93-588b-7061-9f8d-45efe50670d9`, workspace-write/ephemeral) followed TDD. New `scripts/vc6-structseq-dealloc-c89.test.py` failed before source edits with the expected assertion that `tp` must be declared before GC untracking. The only production edit hoists `PyTypeObject *tp;` into the declaration block and changes the original declaration to `tp = Py_TYPE(obj);` immediately after `PyObject_GC_UnTrack(obj)`, preserving assignment timing and teardown order. No unrelated files were changed by the lane.

Exact verification:

- Before-change forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/cron-20261011T200205Z/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261011T200205Z/probe.log 2>&1` — actual probe exit 2; summary `total=107 compiled=106 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First diagnostics were C2275/C2065 at `structseq.c(109)` (`PyTypeObject`/`tp`). Capture: `build/cron-20261011T200205Z/probe.log`.
- TDD RED: `python3 scripts/vc6-structseq-dealloc-c89.test.py` before the production edit — exit 1, expected assertion that `tp` must be declared before GC untracking.
- Focused GREEN and applicable regressions: `python3 scripts/vc6-structseq-dealloc-c89.test.py`, `python3 scripts/vc6-structseq-new-c89.test.py`, and `python3 scripts/vc6-structseq-traverse-c89.test.py` — all exit 0. `git -C cpython diff --check -- Objects/structseq.c` and `git diff --check -- scripts/vc6-structseq-dealloc-c89.test.py` — both exit 0.
- Post-change forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/cron-20261011T201000Z/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261011T201000Z/probe.log 2>&1` — actual probe exit 2; summary `total=107 compiled=106 cached=0 skipped=0`. The prior `structseq_dealloc()` line-109 errors are gone; the first blocker advances to line 263 in `Objects/structseq.c` (`C2143` declaration/statement diagnostics and `C2065 i`), with other later independent diagnostics still present. Capture: `build/cron-20261011T201000Z/probe.log`.
- Exact CPython tag and commit verified unchanged. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution was produced.

Files changed by this slice: `cpython/Objects/structseq.c` (only `structseq_dealloc()` declaration/assignment), new `scripts/vc6-structseq-dealloc-c89.test.py`, and this status entry. Compiler-probe progress only, not a completed port. Next: force-fresh probe before editing; if unchanged, isolate only the first `structseq.c` declaration family now at line 263. Do not conflate compilation progress with linked or target-running interpreter acceptance.

---

## Latest run (`PySlice_New()` C89 declaration placement; frontier advances)

Date: 2026-10-11 UTC

Read `PORT_STATUS.md`, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved all pre-existing outer and detached CPython work; no reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. CPython baseline remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The previously recorded `_blake2`/`sliceobject.c` frontier was force-reprobed before editing using MSVC600 under Wine. `_blake2/blake2module.c`, `_blake2/blake2b_impl.c`, and `_blake2/blake2s_impl.c` compile. The first stable diagnostics remain the `PySlice_New()` late declarations: C2275/C2065 for `PyInterpreterState *interp` at line 126 and `PySliceObject *obj` at line 127, followed by cascading member-access errors. One focused Codex CLI coding lane (`codex-cli 0.153.4`, session `01a12a3d-7607-7211-96a7-1a0449318525`, workspace-write/ephemeral) followed strict TDD. New regression `scripts/vc6-sliceobject-py-slice-new-c89.test.py` failed before production edits at its expected assertion (`interp must be declared at function entry`). The only production change moved declarations of `interp` and `obj` to the start of `PySlice_New()` and changed the interpreter lookup to an assignment at its original point after the null-to-None normalization. Allocation, cache behavior, refcounts, and remaining function bodies were not changed. No unrelated existing work was changed.

Exact verification:

- Before-change forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/cron-20261011T-slice-reprobe/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261011T-slice-reprobe/probe-before.log 2>&1` — probe exit 2; summary `total=106 compiled=105 cached=0 skipped=0`. First errors in `sliceobject.c`: C2275/C2065 at line 126 (`PyInterpreterState`/`interp`), C2275/C2065 at line 127 (`PySliceObject`/`obj`), followed by C2223 cascades at lines 128-130. Later independent declaration diagnostics occurred at lines 600, 608, and 617. Capture: `build/cron-20261011T-slice-reprobe/probe-before.log`.
- TDD RED: `python3 scripts/vc6-sliceobject-py-slice-new-c89.test.py cpython/Objects/sliceobject.c` — exit 1, expected assertion `interp must be declared at function entry`.
- Focused GREEN: same command after edit — exit 0, `PySlice_New C89 declaration placement and lookup: PASS`. This is the only directly applicable focused regression found; no other `sliceobject` C89 scripts exist.
- Applicable CPython runtime suite attempt: `PYTHONDONTWRITEBYTECODE=1 PYTHONPATH=cpython/Lib python3 -m unittest test.test_slice` — exit 1 during import, `AssertionError: SRE module mismatch` because host Python is 3.14.7 while checkout is CPython 3.11.16. `/usr/bin/python3` (3.14.4) was also tried and fails with the same mismatch. No built CPython interpreter is present, so runtime slice tests remain unverified.
- Post-change forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/cron-20261011T-slice-post/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261011T-slice-post/probe.log 2>&1` — probe exit 2; summary `total=106 compiled=105 cached=0 skipped=0`. The prior `PySlice_New()` diagnostics at lines 126-130 are gone. The first remaining diagnostics advance to lines 602, 610, and 619 (`PyObject` late declarations for `t1`, `t2`, and `res`); left untouched as a separate defect family. Capture: `build/cron-20261011T-slice-post/probe.log`.
- `git -C cpython diff --check -- Objects/sliceobject.c` and `git diff --check -- scripts/vc6-sliceobject-py-slice-new-c89.test.py` — exit 0. Baseline tag and commit verified unchanged. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution was produced.

Files changed by this slice: `cpython/Objects/sliceobject.c` (only `PySlice_New()` declarations/assignment), new `scripts/vc6-sliceobject-py-slice-new-c89.test.py`, and this status entry. This is compiler-probe progress only, not a completed port. Next: force-fresh probe before editing and, if unchanged, isolate only the first remaining `sliceobject.c` late-declaration family (around line 602) with a new TDD test. Do not claim port completion.

---

## Latest run (`PySet_Type`/`PyFrozenSet_Type` positional initializer; frontier advances)

Date: 2026-10-11 05:00 UTC

Read `PORT_STATUS.md`, `README.md`, and the CPython 3.11.16 Win9x/MSVC6 reference before acting. Preserved all pre-existing outer and detached CPython work; no reset, clean, stash, discard, commit, push, publication, or patch regeneration. CPython baseline remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The prior recorded `setobject.c` declaration blocker was not current: a forced-fresh MSVC600/Wine probe compiled `_blake2/blake2s_impl.c` and `Objects/setobject.c`; the only reported errors in that file were C2059 on designated `.tp_vectorcall` initializers at lines 2188 and 2289. One focused Codex CLI lane (`codex-cli 0.153.4`, session `01a12951-3465-7492-b050-43f906e76593`, workspace-write/ephemeral) used strict TDD. The new regression's pre-edit RED failed as expected at both designators under strict C89. Only these two initializer entries changed: nine intervening `PyTypeObject` fields are explicitly zeroed in actual declaration order, and each original vectorcall function remains in `tp_vectorcall`. The new regression compiles both actual initializers as strict C89 and verifies all 48 field mappings against the checkout's `PyTypeObject` layout. Hash comparison confirms pre-existing files remained unchanged except the intended source edits; `PORT_STATUS.md` and compatibility patches were untouched during the coding lane.

Exact verification:

- Before-change forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/cron-current-recheck/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-current-recheck/probe.log 2>&1` — probe exit 2; summary `total=105 compiled=104 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. The first/only errors in `setobject.c` were C2059 at lines 2188 and 2289. Capture: `build/cron-current-recheck/probe.log`.
- TDD RED: `python3 scripts/vc6-setobject-type-vectorcall-c89.test.py cpython/Objects/setobject.c` before the source edit — exit 1 with expected C90 designated-initializer errors at both vectorcall entries.
- Focused GREEN and applicable regressions: `python3 scripts/vc6-setobject-type-vectorcall-c89.test.py cpython/Objects/setobject.c` plus every `scripts/vc6-setobject-*.test.py` with `cpython/Objects/setobject.c` — all seven tests exit 0. Both type initializers pass all 48 semantic field mappings; `setiter_reduce` passes eight cases. `git diff --check` and `git -C cpython diff --check -- Objects/setobject.c` — exit 0.
- Post-change forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/cron-current-recheck-post/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-current-recheck-post/probe.log 2>&1` — probe exit 2; summary `total=106 compiled=105 cached=0 skipped=0`. `_blake2/blake2s_impl.c` and `Objects/setobject.c` compile; former setobject C2059 errors are gone. The first reported blocker advances to C2275/C2065 at `Objects/sliceobject.c(126-130)`, followed by independent late-declaration families at lines 141, 600, 608, and 617. Capture: `build/cron-current-recheck-post/probe.log`. An initial post-probe invocation lacked its output directory and exited 1 before starting; the recorded successful retry created the directory first.
- `git -C cpython describe --tags --exact-match HEAD` → `v3.11.16`; `git -C cpython rev-parse HEAD` → `41388c9cb160d0886d5ca00d2e6c8782608a4549`. The compiler output did not provide a separate compiler banner. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution was produced.

Files changed by this slice: `cpython/Objects/setobject.c` (only the two static type initializer tails), new `scripts/vc6-setobject-type-vectorcall-c89.test.py`, and this status entry. This is compiler-probe progress only, not a completed port. Next: force-fresh probe before editing; if the result is still current, isolate the first `Objects/sliceobject.c` declaration blocker at line 126 in its own TDD slice. Do not conflate compiler progress with a linked or target-running interpreter.

---

## Latest run (`set_issuperset()` C89 declaration hoisted; frontier advances)

Date: 2026-10-10 22:21 UTC

Read `PORT_STATUS.md`, `README.md`, and the CPython Win9x/MSVC6 reference before acting. Preserved all pre-existing root and detached CPython work; no reset, clean, stash, discard, commit, push, publication, or patch regeneration. CPython baseline remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded first blocker was force-reprobed before editing with MSVC600 under Wine. The prior status named `set_update_internal()`; current source/probe shows the exact function is `set_issuperset()` at line 1782. It failed on a late initialized declaration `PyObject *key, *it = PyObject_GetIter(other);` with C2275/C2065/C2100. One focused Codex CLI lane (`codex-cli 0.153.4`, session `01a127ec-3e7e-7ba3-9c34-172d872b5aa9`, workspace-write/ephemeral) performed strict TDD. The new test failed before production change with the expected missing-entry-declarations assertion. The only production change declares `key` and `it` in the function declaration block and moves `PyObject_GetIter(other)` assignment to the original evaluation point. The set fast path, loop, refcounts, errors, and returns are unchanged. An independent hash/status comparison confirmed exactly two paths changed; all pre-existing outer/nested content and status were preserved.

Exact verification:

- Before-change forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/cron-20261010T222104Z/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261010T222104Z/probe.log 2>&1` — cl/probe exit 2; summary `total=105 compiled=104 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First diagnostics at `Objects/setobject.c(1782)`: C2275 `PyObject`, C2065 `key` and `it`, C2100 illegal indirection; cascades follow. Later distinct blockers: C2275/C2146/C2065 for `Py_ssize_t nargs` at line 2021, then C2059 at lines 2183 and 2284. Capture: `build/cron-20261010T222104Z/probe.log`.
- TDD RED: `python3 scripts/vc6-setobject-issuperset-c89.test.py cpython/Objects/setobject.c` before production change — exit 1, expected assertion that `key` and `it` must be declared in the initial block.
- Focused GREEN and applicable setobject regressions: `python3 scripts/vc6-setobject-issuperset-c89.test.py cpython/Objects/setobject.c`, `python3 scripts/vc6-setobject-make-new-set-c89.test.py cpython/Objects/setobject.c`, `python3 scripts/vc6-setobject-setiter-reduce-c89.test.py cpython/Objects/setobject.c`, `python3 scripts/vc6-setobject-table-resize-c89.test.py cpython/Objects/setobject.c`, and `python3 scripts/vc6-setobject-frozenset-vectorcall-c89.test.py cpython/Objects/setobject.c` — all exit 0. Output confirms the new C89 declaration/ownership check and four existing regressions pass (set iterator includes eight cases). Scoped nested and outer `git diff --check` — exit 0.
- Post-change forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/cron-20261010T222104Z/runtime-post" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261010T222104Z/probe-post.log 2>&1` — cl/probe exit 2; summary `total=105 compiled=104 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled and `setobject.c` now compiles past line 1782. The first remaining error family advances to `Py_ssize_t nargs` at line 2024: C2275/C2146/C2065. Further distinct designated-initializer errors are C2059 at lines 2186 and 2287. Capture: `build/cron-20261010T222104Z/probe-post.log`.
- `git -C cpython describe --tags --exact-match HEAD` → `v3.11.16`; `git -C cpython rev-parse HEAD` → `41388c9cb160d0886d5ca00d2e6c8782608a4549`. No standalone compiler banner was captured. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution was produced.

Files changed by this slice: `cpython/Objects/setobject.c` (only `set_issuperset()` declarations/assignment), new `scripts/vc6-setobject-issuperset-c89.test.py`, and this status entry. Compiler-probe progress only, not a completed port. Next: forced-fresh probe before editing; if unchanged, handle only the `Py_ssize_t nargs` declaration family at the current `setobject.c` line 2024 in its own TDD slice. Do not combine the later designated initializers.

---

## Previous run (fresh `set_issuperset()` blocker confirmed; coding lane unavailable)

Date: 2026-10-10 20:15 UTC

Read `PORT_STATUS.md`, `README.md`, and the applicable CPython Win9x/MSVC6 reference before acting. Preserved all pre-existing outer and detached CPython changes; no reset, clean, stash, discard, commit, push, publication, or patch regeneration. CPython remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded frontier was freshly force-reprobed. The first stable blocker remains in `Objects/setobject.c(1782)` within `set_update_internal()`: C2275 `PyObject`, C2065 `key`/`it`, and C2100 illegal indirection; subsequent independent errors occur at line 2021 (`Py_ssize_t nargs`) and designated initializers at 2183 and 2284. `_blake2/blake2s_impl.c` compiled. The one focused coding-subagent attempt for only the first blocker failed before startup because the Anthropic package is unavailable and lazy installs are disabled. Therefore this run is diagnostics-only: no production or test files were changed, and no TDD RED/GREEN implementation cycle is claimed. Existing directly applicable setobject tests pass. No pre-existing work was modified beyond this status entry.

Exact verification:

- `XDG_RUNTIME_DIR="$PWD/build/cron-20261010T201500Z/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261010T201500Z/probe.log 2>&1` — actual probe exit 2; summary `total=105 compiled=104 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First errors: `setobject.c(1782)` C2275/C2065/C2100; distinct later errors at 2021, 2183, and 2284. Capture: `build/cron-20261010T201500Z/probe.log`.
- Focused coding delegation for the confirmed first `set_update_internal()` blocker — failed before child startup: missing `anthropic` package; lazy installs disabled. No child edits occurred.
- Existing regressions `scripts/vc6-setobject-make-new-set-c89.test.py`, `scripts/vc6-setobject-setiter-reduce-c89.test.py`, `scripts/vc6-setobject-table-resize-c89.test.py`, and `scripts/vc6-setobject-frozenset-vectorcall-c89.test.py` — all exit 0.
- `git diff --check -- PORT_STATUS.md` and `git -C cpython diff --check -- Objects/setobject.c` — exit 0. Exact baseline tag and commit verified unchanged.
- No standalone compiler banner was captured. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution was produced.

Files changed this run: `PORT_STATUS.md` only. Compiler-probe progress only; no port completion is claimed. Next frontier: retry one focused TDD coding lane for the actual first declaration blocker in `set_update_internal()` at line 1782; leave the line-2021 and designated-initializer blockers separate.

---

## Previous latest run (fresh frontier moved to `setobject.c`; coding lane unavailable)

Date: 2026-10-10 UTC

Read `PORT_STATUS.md`, `README.md`, and the CPython Win9x/MSVC6 reference before acting. Preserved all pre-existing outer and detached CPython changes; no reset, clean, stash, discard, commit, push, publication, or patch regeneration. CPython remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded `_blake2/blake2s_impl.c` success and `setobject.c` frontier were freshly checked using the forced-fresh MSVC600/Wine source-list probe. `_blake2/blake2s_impl.c` still compiles, but the previously logged `frozenset_vectorcall()` and later `setobject.c` diagnostics are stale: the actual first stable compiler errors now start at `Objects/setobject.c(1782)` inside `set_update_internal()` (C2275 `PyObject`, C2065 `key` and `it`, followed by C2100 illegal indirection). Further independent diagnostics are C2275/C2146/C2065 for `Py_ssize_t nargs` at line 2021, then designated-initializer C2059 at lines 2183 and 2284. The one required focused coding-subagent attempt failed before child startup because the Anthropic package is unavailable and lazy installs are disabled. Therefore this run is diagnostics-only: no TDD RED/GREEN, implementation, or regression test is claimed, and no source/test files were changed. The current first blocker must be inspected and handled as its own TDD slice when the coding lane can start.

Exact verification:

- `XDG_RUNTIME_DIR="$PWD/build/cron-20261010Tcurrent-next-check/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261010Tcurrent-next-check/probe.log 2>&1` — actual probe exit 2; summary `total=105 compiled=104 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First stable diagnostics: `Objects/setobject.c(1782)` C2275 on `PyObject`, C2065 on `key` and `it`, then C2100; later distinct errors at lines 2021, 2183, and 2284. Capture: `build/cron-20261010Tcurrent-next-check/probe.log`.
- Focused coding delegation for only the confirmed first `setobject.c` blocker — failed before child startup: missing `anthropic` package; lazy installs disabled. No child edits or test runs occurred.
- `git -C cpython describe --tags --exact-match HEAD` → `v3.11.16`; `git -C cpython rev-parse HEAD` → `41388c9cb160d0886d5ca00d2e6c8782608a4549`.
- No standalone compiler banner was captured. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution was produced.

Files changed this run: `PORT_STATUS.md` only. Compiler-probe progress only; no port completion is claimed. Next frontier: use a focused TDD coding lane on the actual first declaration blocker in `Objects/setobject.c` at line 1782, after confirming the exact function-local semantics; keep later line-2021 and designated-initializer blockers separate. Do not claim a completed port.

---

## Latest run (`make_new_set()` declaration hoisted; frontier advances)

Date: 2026-10-10 UTC

Read this status, `README.md`, and the CPython Win9x/MSVC6 reference before acting. Preserved all pre-existing outer and detached CPython work; no reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. CPython remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded `make_new_set()` frontier was force-reprobed before editing using MSVC600 under Wine. `_blake2/blake2s_impl.c` compiled. First stable diagnostics were C2143 at `Objects/setobject.c(957)` and C2065 `so` at `(959)`; the `so->` errors at `(963-969)` cascade from that declaration. One focused Codex CLI coding lane (`codex-cli 0.153.4`, OpenAI provider, workspace-write, ephemeral; session `01a12614-9049-7873-a1f7-849f7702bc90`) followed strict TDD. It added a regression checking the declaration placement and preserving assertion/allocation/failure-check order; its pre-edit RED failed as expected because `so` was after the assertion. The only production edit moved `PySetObject *so;` before the assertion. Allocation, evaluation, error handling, and all other functions remain unchanged. Snapshot/hash checks confirmed all pre-existing outer/nested dirty and untracked contents plus both staged diffs were preserved.

Exact verification:

- Before-change forced-fresh command: `XDG_RUNTIME_DIR="$PWD/build/cron-20261010Tcurrent-next/runtime-reprobe" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261010Tcurrent-next/probe-before.log 2>&1` — actual probe exit 2; summary `total=105 compiled=104 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First diagnostics C2143 at line 957 and C2065 `so` at line 959. Capture: `build/cron-20261010Tcurrent-next/probe-before.log`.
- TDD RED: `python3 scripts/vc6-setobject-make-new-set-c89.test.py cpython/Objects/setobject.c` before production edit — exit 1 with expected assertion `so must be declared without initializer before the assertion`.
- Focused GREEN/regressions: `python3 scripts/vc6-setobject-make-new-set-c89.test.py cpython/Objects/setobject.c`, `python3 scripts/vc6-setobject-setiter-reduce-c89.test.py cpython/Objects/setobject.c`, `python3 scripts/vc6-setobject-table-resize-c89.test.py cpython/Objects/setobject.c`, `git diff --check`, and `git -C cpython diff --check` — all exit 0. The new test checks declaration uniqueness and assertion/allocation/failure-check order; setiter regression passes eight cases.
- Post-change forced-fresh command: `XDG_RUNTIME_DIR="$PWD/build/cron-20261010Tcurrent-next/runtime-post" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261010Tcurrent-next/probe-after.log 2>&1` — actual probe exit 2; summary `total=105 compiled=104 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. No diagnostics remain at `make_new_set()` lines 957-969. The first blocker advances to the distinct `frozenset_vectorcall()` declaration family at lines 1034-1039 (C2275/C2146/C2065). Further untouched diagnostics occur at lines 1779, 2018, 2180, and 2281. Capture: `build/cron-20261010Tcurrent-next/probe-after.log`.
- `git -C cpython describe --tags --exact-match HEAD` → `v3.11.16`; `git -C cpython rev-parse HEAD` → `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

Files changed by this slice: `cpython/Objects/setobject.c` (one declaration hoist), new `scripts/vc6-setobject-make-new-set-c89.test.py`, and this status entry. Compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next frontier: force-fresh probe before editing; if unchanged, isolate only the first `frozenset_vectorcall()` C89 declaration blocker at `setobject.c(1034)` in its own TDD slice. Do not claim port completion.

---

## Latest run (`setiter_reduce()` C89 declaration; frontier advances)

Date: 2026-10-10 11:45 UTC

Read `PORT_STATUS.md`, `README.md`, and the relevant CPython Win9x/MSVC6 reference before acting. Preserved pre-existing outer and detached CPython modifications. No reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. CPython remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`. Used one focused Codex CLI coding lane (`codex-cli 0.153.4`, OpenAI provider, workspace-write, ephemeral; session `01a1259c-aea6-7783-9904-89049dac951c`) for only the first confirmed `setobject.c` blocker and strict TDD. The new regression's pre-edit RED run failed as expected under strict C89 on the mixed declaration in `setiter_reduce()`. The only production change hoisted `PyObject *list` to the function declaration block; `list = PySequence_List((PyObject*)&tmp)` remains after the iterator-state copy and `Py_XINCREF(tmp.si_set)`, and cleanup/return paths are unchanged. Snapshot verification confirms all 162 pre-existing changed/untracked files' contents stayed byte-identical; only the intended `setobject.c` edit and new test were added. No other setobject blocker was changed.

Exact verification:

- Before-change forced-fresh command: `XDG_RUNTIME_DIR="$PWD/build/cron-20261010-current/runtime-reprobe" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261010-current/probe-current.log 2>&1` — actual probe exit 2; summary `total=104 compiled=103 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First stable diagnostics were C2275/C2065 at `Objects/setobject.c(779)` for the late `PyObject *list`; later distinct diagnostics included `make_new_set()` at line 956, `frozenset_vectorcall()` at 1033, `set_update_internal()` at 1778, and positional-initializer errors at 2179 and 2280. Capture: `build/cron-20261010-current/probe-current.log`.
- TDD RED: `python3 scripts/vc6-setobject-setiter-reduce-c89.test.py cpython/Objects/setobject.c` before production edit — exit 1, expected `ISO C90 forbids mixed declarations and code` at `PyObject *list = PySequence_List(...)`.
- Focused GREEN and applicable setobject regression tests: `python3 scripts/vc6-setobject-setiter-reduce-c89.test.py cpython/Objects/setobject.c` and `python3 scripts/vc6-setobject-table-resize-c89.test.py cpython/Objects/setobject.c` — both exit 0. New test compiles/runs exact extracted function with strict C89 and covers eight reference/evaluation/cleanup/return cases. Scoped nested and outer `git diff --check` — exit 0.
- Post-change forced-fresh command: `XDG_RUNTIME_DIR="$PWD/build/cron-20261010-current/runtime-post" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261010-current/probe-after.log 2>&1` — actual probe exit 2; summary `total=105 compiled=104 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. The prior line-779 diagnostic is gone and `Objects/setobject.c` compiles past the changed function. First remaining blocker advances to C2143 at `Objects/setobject.c(957)` (`make_new_set()` declaration); further untouched diagnostics include lines 1034, 1039, 1779, 2018, 2180, and 2281. Capture: `build/cron-20261010-current/probe-after.log`.
- `git -C cpython describe --tags --exact-match HEAD` → `v3.11.16`; `git -C cpython rev-parse HEAD` → `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

Files changed by this slice: `cpython/Objects/setobject.c` (only `setiter_reduce()` declaration split), new `scripts/vc6-setobject-setiter-reduce-c89.test.py`, and this status entry. Compiler-probe progress only: the source-list probe still fails; no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next frontier: freshly force-reprobe before editing, then isolate only the actual first `make_new_set()` C89 declaration blocker at line 956 using its own TDD test. Do not claim port completion.

---

## Previous latest run (`PyRange_Type.tp_vectorcall` positional initializer; frontier advances)

Date: 2026-10-10 UTC

Read `PORT_STATUS.md`, `README.md`, and the CPython Win9x/MSVC6 reference before acting. Preserved the existing outer and detached CPython changes; no reset, clean, stash, discard, commit, push, publication, or patch regeneration. CPython baseline remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded rangeobject frontier was forced-fresh re-probed before editing. `_blake2/blake2s_impl.c` compiled; VC6's first diagnostic was C2059 at `Objects/rangeobject.c(791)` on the designated `.tp_vectorcall` entry. One focused Codex CLI lane (`codex-cli 0.153.4`, OpenAI provider, workspace-write, ephemeral; session `01a12439-49b6-7d73-b375-35a5c504fcbf`) followed TDD. It added a regression using the actual `PyTypeObject` header field order and asserting all 48 semantic fields. The test failed before production edit with the expected C90 designated-initializer error. Only the final `PyRange_Type` designated entry was replaced with ten explicit zero initializers for `tp_free` through `tp_finalize`, then positional `(vectorcallfunc)range_vectorcall`; no other range initializer or production code changed. Snapshot verification confirmed all pre-existing dirty/untracked files, including the pre-existing `PORT_STATUS.md` contents, remained unchanged aside from this intended production/test slice.

Exact verification:

- Before-change command: `XDG_RUNTIME_DIR="$PWD/build/cron-20261010-current/runtime-reprobe" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261010-current/probe-before.log 2>&1` — actual probe exit 2; `total=104 compiled=103 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First stable diagnostic C2059 at `Objects/rangeobject.c(791)` on `.`. Capture: `build/cron-20261010-current/probe-before.log`.
- TDD RED: `python3 scripts/vc6-rangeobject-vectorcall-c89.test.py cpython/Objects/rangeobject.c` before source edit — exit 1, expected `ISO C90 forbids specifying subobject to initialize` for `.tp_vectorcall`.
- Focused GREEN and rangeobject regressions: `python3 scripts/vc6-rangeobject-vectorcall-c89.test.py cpython/Objects/rangeobject.c`, `python3 scripts/vc6-rangeobject-number-c89.test.py cpython/Objects/rangeobject.c`, and `python3 scripts/vc6-rangeobject-index-c89.test.py cpython/Objects/rangeobject.c` — all exit 0; all 48 type fields, all 36 number slots, and nine range-index cases pass. `git diff --check` and `git -C cpython diff --check -- Objects/rangeobject.c` — exit 0.
- Post-change forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/cron-20261010-current/runtime-post" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261010-current/probe-after.log 2>&1` — actual probe exit 2; `total=105 compiled=104 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. The changed `rangeobject.c` blocker is gone; first stable diagnostics advance to `Objects/setobject.c(244)` C2143 and `(245)` C2065 `newsize`, followed by further distinct blockers in `setobject.c`. Capture: `build/cron-20261010-current/probe-after.log`.
- `git -C cpython describe --tags --exact-match HEAD` → `v3.11.16`; `git -C cpython rev-parse HEAD` → `41388c9cb160d0886d5ca00d2e6c8782608a4549`. The coding lane's hash/status snapshot check and independent diff review passed: 158 previously dirty/untracked files retained byte-for-byte; only the intended CPython source modification and new test added.

Files changed by this slice: `cpython/Objects/rangeobject.c` (only final `PyRange_Type` initializer entry), new `scripts/vc6-rangeobject-vectorcall-c89.test.py`, and this status entry. Compiler-probe progress only: the VC6 source-list probe still fails; no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next frontier: freshly probe before editing; if unchanged, isolate only `Objects/setobject.c(244)`'s first C89 declaration blocker in its own TDD slice. Do not claim port completion.

---

## Latest run (`range_as_number` positional initializer; frontier advances)

Date: 2026-10-10 03:05 UTC

Read `PORT_STATUS.md`, `README.md`, and the relevant CPython Win9x/MSVC6 reference before acting. Preserved all existing outer and detached CPython changes. No reset, clean, stash, discard, commit, push, publication, or patch regeneration. CPython baseline remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The previously recorded rangeobject frontier was freshly confirmed with forced-fresh MSVC600/Wine compilation before editing. `_blake2/blake2s_impl.c` compiled; the first stable diagnostic was C2059 at `Objects/rangeobject.c(686)` on `.nb_bool`; a separate C2059 remained later at line 756 on `.tp_vectorcall`. One focused Codex CLI coding lane (`codex-cli 0.153.4`, ephemeral, workspace-write) followed strict TDD. It added `scripts/vc6-rangeobject-number-c89.test.py`, which derives all 36 `PyNumberMethods` fields from the actual header and checks each slot semantically. The test failed before production edits as expected with `ISO C90 forbids specifying subobject to initialize`. Only `range_as_number` was converted to positional initialization, mapping `(inquiry)range_bool` to `nb_bool` and zeroing all other fields. The separate `.tp_vectorcall` initializer was not touched. A snapshot verification confirmed all pre-existing dirty/untracked bytes, both indexes, statuses, and HEADs were preserved except for this intended source edit and added test.

Exact verification:

- Pre-change command: `XDG_RUNTIME_DIR="$PWD/build/cron-20261010Tcurrent/runtime-reprobe" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261010Tcurrent/probe-before.log 2>&1` — actual probe exit 2; `total=104 compiled=103 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First diagnostic C2059 at `rangeobject.c(686)`; separate C2059 at `(756)`. Capture: `build/cron-20261010Tcurrent/probe-before.log`.
- TDD RED: `python3 scripts/vc6-rangeobject-number-c89.test.py cpython/Objects/rangeobject.c` — exit 1 before source edit, expected C89 rejection of designated initializer at `.nb_bool`.
- Focused GREEN and applicable rangeobject regressions: `python3 scripts/vc6-rangeobject-number-c89.test.py cpython/Objects/rangeobject.c` and `python3 scripts/vc6-rangeobject-index-c89.test.py cpython/Objects/rangeobject.c` — both exit 0. The new semantic test checked all 36 fields; range-index test passed 9 cases.
- Post-change forced-fresh probe using the same command with runtime `build/cron-20261010Tcurrent/runtime-post` — actual probe exit 2; `total=104 compiled=103 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. The line-686 blocker is gone. First blocker advances to C2059 at `Objects/rangeobject.c(791)` on the distinct designated initializer. Capture: `build/cron-20261010Tcurrent/probe-after.log`.
- `git diff --check`, `git -C cpython diff --check -- Objects/rangeobject.c`, and independent rerun of both rangeobject tests — exit 0. Exact CPython tag/commit unchanged. Snapshot confirms outer/nested index and all pre-existing dirty/untracked content preserved.

Files changed by this slice: `cpython/Objects/rangeobject.c` (only `range_as_number`), new `scripts/vc6-rangeobject-number-c89.test.py`, and this status entry. Compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next frontier: freshly probe before editing; if still confirmed, isolate only the `rangeobject.c(791)` designated initializer with its own TDD test. Do not claim port completion.

---

## Previous latest run (range initializer frontier reconfirmed; coding lane unavailable)

Date: 2026-10-10 00:48 UTC

Read `PORT_STATUS.md`, `README.md`, and the relevant CPython Win9x/MSVC6 reference before acting. The reference at `/home/ubuntu/.hermes/profiles/maxwell/skills/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` was absent; read the available copy at `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md`. Preserved all pre-existing outer and detached CPython changes. No reset, clean, stash, discard, commit, push, or patch regeneration. CPython remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded rangeobject frontier remains current after a forced-fresh MSVC600/Wine source-list probe. `_blake2/blake2s_impl.c` compiled; the first stable diagnostic is C2059 at `Objects/rangeobject.c(686)` on the designated `.nb_bool` initializer. A later separate C2059 remains at line 756 on `.tp_vectorcall`. One focused coding-subagent attempt was made for only the line-686 initializer and TDD regression, but failed before child startup because the Anthropic package is unavailable and lazy installs are disabled. No implementation, test, or production source was changed in this run; this is diagnostics-only. The existing local `range_index()` declaration split was preserved.

Exact verification:

- `XDG_RUNTIME_DIR="$PWD/build/cron-20261010Tcurrent/runtime-reprobe" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261010Tcurrent/probe-before.log 2>&1` — actual probe exit 2; summary `total=104 compiled=103 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First stable diagnostic: C2059 at `rangeobject.c(686)`; separate later C2059 at `(756)`. Capture: `build/cron-20261010Tcurrent/probe-before.log`.
- Focused coding-agent lane — failed before child startup: `anthropic` package required; lazy installs disabled. No child edits occurred; no TDD RED/GREEN or regression run is claimed.
- `git -C cpython describe --tags --exact-match HEAD` → `v3.11.16`; `git -C cpython rev-parse HEAD` → `41388c9cb160d0886d5ca00d2e6c8782608a4549`. Scoped nested and outer `git diff --check` commands exited 0.
- No standalone compiler banner was captured. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution was produced.

Files changed this run: `PORT_STATUS.md` only. Compiler-probe progress only; no port completion is claimed. Next: retry one focused TDD coding lane for only `range_as_number` at line 685 when a coding provider can start, leaving the independent line-756 initializer untouched.

---

## Previous latest run (`range_index()` C89 local declaration; frontier advances)

Date: 2026-10-09 UTC

Read `PORT_STATUS.md`, `README.md`, and the CPython Win9x/MSVC6 reference before acting. Preserved the existing outer and detached CPython work; no reset, clean, stash, discard, commit, push, publication, or patch regeneration. CPython baseline remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded range frontier was freshly re-probed before editing using MSVC600 under Wine, forced-fresh. `_blake2/blake2s_impl.c` compiled; the first blocker was C2275/C2065 at `Objects/rangeobject.c(601)` for the late `PyObject *sidx` declaration. One focused Codex CLI lane (`codex-cli 0.153.4`, OpenAI provider, workspace-write, ephemeral; session `01a122d4-4e91-7f10-b7b8-713868d6b34c`) followed TDD. It added `scripts/vc6-rangeobject-index-c89.test.py`, observed the expected C89 mixed-declaration RED before production edits, then hoisted only the `sidx` declaration. The `PyNumber_FloorDivide` assignment remains at its original evaluation point; no other production function was changed. Snapshot/hash verification confirms the pre-existing 32 outer and 124 CPython dirty/untracked paths and both indexes were unchanged apart from the intended test addition and source edit.

Exact verification:

- Before-change forced-fresh command: `XDG_RUNTIME_DIR="$PWD/build/cron-20261009Tcurrent/runtime-rerun" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261009Tcurrent/pre-change-probe-cron-rerun.log 2>&1` — actual probe exit 2; summary `total=104 compiled=103 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First stable diagnostics: C2275/C2065 at `rangeobject.c(601)` (`PyObject` / `sidx`); separate C2059 designated-initializer diagnostics at lines 685 and 755. Capture: `build/cron-20261009Tcurrent/pre-change-probe-cron-rerun.log`.
- TDD RED: `python3 scripts/vc6-rangeobject-index-c89.test.py cpython/Objects/rangeobject.c` before the source edit — exit 1, expected C90 mixed-declaration diagnostic at the late `sidx` declaration (recorded by the coding lane).
- Focused GREEN: same command after the edit — exit 0, `range_index C89 compile and evaluation/cleanup order: PASS (9 cases)`. The CPython `test_range` suite was also attempted under host Python 3.14.7 (not this CPython 3.11.16 checkout's built interpreter): 26 tests ran, six subtest failures in `test_iterator_pickling_overflowing_index` for protocols 0–5 (`None != 0`); thus this suite is not claimed as passing or as validation of the edited C source.
- Post-change forced-fresh command: `XDG_RUNTIME_DIR="$PWD/build/cron-20261009Tcurrent/runtime-post-range-index" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261009Tcurrent/post-range-index.log 2>&1` — actual probe exit 2; summary `total=104 compiled=103 cached=0 skipped=0`. `_blake2/blake2s_impl.c` and `Objects/rangeobject.c` compiled; former line-601 C2275/C2065 diagnostics are gone. First blocker remains in `rangeobject.c` at line 686, C2059 on a designated initializer; another C2059 remains at line 756. Capture: `build/cron-20261009Tcurrent/post-range-index.log`.
- `/tmp/rangeobject-sidx-baseline/verify.py` — exit 0; confirms all 32 outer and 124 CPython pre-existing dirty/untracked paths and each index are unchanged, with only the intended new outer test and modified CPython `rangeobject.c`. `git diff --check` and `git -C cpython diff --check -- Objects/rangeobject.c` — exit 0. Exact baseline tag and commit verified unchanged.

Files changed by this slice: `cpython/Objects/rangeobject.c` (only `sidx` declaration/assignment split), new `scripts/vc6-rangeobject-index-c89.test.py`, and this status entry. Compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next: force-fresh probe before editing, then handle only the first `rangeobject.c` designated-initializer blocker at line 686 using its own TDD slice. Do not claim port completion.

---

## Latest run (`PyPickleBuffer_Type` C89 positional initializer; frontier advances)

Date: 2026-10-09 20:35 UTC

Read `PORT_STATUS.md`, `README.md`, and the CPython Win9x/MSVC6 reference before acting. Preserved the existing dirty outer and detached CPython work; no reset, clean, stash, discard, commit, push, or patch regeneration. CPython baseline remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded picklebuf frontier was freshly rechecked first with forced-fresh MSVC600/Wine compilation: `_blake2/blake2s_impl.c` and `Objects/picklebufobject.c` compiled; first stable blocker was C2059 at `Objects/picklebufobject.c(211)` on `.tp_name`. One focused Hermes coding-agent attempt failed before startup because the Anthropic package is unavailable and lazy installs are disabled. One Codex CLI lane (`codex-cli 0.153.4`, OpenAI provider, workspace-write, ephemeral; session `01a1225b-912d-7f93-8cdd-a48be9cae1e2`) followed TDD. It added `scripts/vc6-picklebuf-type-c89.test.py`, observed expected C89 designated-initializer RED before changing production code, then converted only `PyPickleBuffer_Type` to positional initialization. The regression checks all 48 `PyTypeObject` fields against the checkout's actual struct layout: all 11 original designated expressions are preserved semantically and the other 37 fields are explicitly zero. Its host C89 compile/runtime harness passed. Snapshot comparison confirmed all other 156 existing dirty/untracked files and indexes remained unchanged; source outside this initializer, including the already-dirty `picklebufobject.c`, is unchanged by the slice.

Exact verification:

- Pre-change forced-fresh command: `XDG_RUNTIME_DIR="$PWD/build/cron-20261009Tcurrent/runtime-rerun" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261009Tcurrent/probe-cron-recheck.log 2>&1` — actual probe exit 2; summary `total=103 compiled=102 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First stable diagnostic C2059 at `picklebufobject.c(211)`. Capture: `build/cron-20261009Tcurrent/probe-cron-recheck.log`.
- TDD RED: `python3 scripts/vc6-picklebuf-type-c89.test.py cpython/Objects/picklebufobject.c` — exit 1 before production edit; expected `ISO C90 forbids specifying subobject to initialize` on all 11 designated entries.
- GREEN and all applicable picklebuf tests: `for test in scripts/vc6-picklebuf-*.test.py; do python3 "$test" cpython/Objects/picklebufobject.c; result=$?; echo "$test exit=$result"; if test "$result" -ne 0; then exit "$result"; fi; done` — exit 0. The new type test passed all 48 semantic field mappings; existing buffer-field and `picklebuf_raw()` validation/allocation-order tests passed (5 cases). Independently reran the new type test — exit 0.
- Post-change forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/cron-20261009Tcurrent/runtime-post-picklebuf-type" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261009Tcurrent/probe-post-picklebuf-type.log 2>&1` — actual probe exit 2; summary `total=104 compiled=103 cached=0 skipped=0`. `_blake2/blake2s_impl.c` and `Objects/picklebufobject.c` compiled; previous picklebuf designated-initializer blocker is gone. First blocker advances to `Objects/rangeobject.c(601)` with C2275 `PyObject` and C2065 `sidx`; later independent C2059 diagnostics are at lines 685 and 755. Capture: `build/cron-20261009Tcurrent/probe-post-picklebuf-type.log`.
- `git -C cpython diff --check`, `git diff --check`, and focused type test — exit 0. Nested CPython exact tag and commit verified unchanged. Codex's `diff --no-index --check /dev/null new-file` and whole-file comparison returned exit 1 because those commands signal differing content; no whitespace diagnostics were emitted. These are not counted as passing checks.

Files changed by this slice: `cpython/Objects/picklebufobject.c` (only `PyPickleBuffer_Type`), new `scripts/vc6-picklebuf-type-c89.test.py`, and this status entry. Compiler-frontier progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next: force-fresh probe before editing and address only the current first blocker in `Objects/rangeobject.c` at line 601. Do not claim port completion.

---

## Latest run (`picklebuf_raw()` C89 declarations; frontier advances)

Date: 2026-10-09 16:04 UTC

Read `PORT_STATUS.md`, `README.md`, and the relevant legacy-toolchain reference before acting. The reference is at `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md`; the project-local copy is absent. Preserved all pre-existing outer and detached CPython changes. No reset, clean, stash, discard, commit, push, publication, or patch regeneration. CPython baseline remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded `picklebuf_raw()` blocker was confirmed with a forced-fresh MSVC600/Wine probe before editing. `_blake2/blake2s_impl.c` compiled. VC6 reported C2059 at the independent designated initializer in `Objects/picklebufobject.c(142)`, then C2275/C2065 at `(162)` for `PyObject *m` and `(166)` for `PyMemoryViewObject *mv`, followed by cascades. One focused Hermes coding-subagent attempt failed before startup because the Anthropic package is unavailable and lazy installs are disabled. One Codex CLI lane (`codex-cli 0.153.4`, OpenAI provider, workspace-write, ephemeral; session `01a12169-8e26-79d1-971b-be4dac44ca93`) then followed strict TDD. It added a focused C89 compile/runtime regression covering released/non-contiguous validation, allocation failure, memoryview mutation, and event order; it observed the expected mixed-declaration RED before moving only `m` and `mv` to the function's declaration block. Their assignments remain at the original points after the guards and successful allocation. The C2059 designated initializers and all other files/blockers were left untouched. Independent diff review confirms only the two declaration forms changed in `picklebuf_raw()`.

Exact verification:

- Before-change command: `XDG_RUNTIME_DIR="$PWD/build/cron-20261009Tcurrent/runtime-reprobe" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261009Tcurrent/reprobe-before.log 2>&1` — actual probe exit 2; summary `total=103 compiled=102 cached=0 skipped=0`. First stable diagnostics: C2059 at line 142; C2275/C2065 at lines 162 and 166; independent C2059 at line 208. `_blake2/blake2s_impl.c` compiled. Log: `build/cron-20261009Tcurrent/reprobe-before.log`.
- TDD RED: `python3 scripts/vc6-picklebuf-raw-c89.test.py cpython/Objects/picklebufobject.c` before the production edit — expected C89 mixed-declaration failure, as recorded by the Codex lane. GREEN and focused C89 compile/runtime cases: same command after edit — exit 0, `picklebuf_raw C89 compile and validation/allocation order: PASS (5 cases)`.
- Post-change forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/cron-20261009Tcurrent/runtime-post" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261009Tcurrent/probe-post-picklebuf-raw.log 2>&1` — actual probe exit 2; summary `total=103 compiled=102 cached=0 skipped=0`. The former line-162/166 declaration diagnostics are gone; first blocker is now the designated initializer C2059 at line 142 (also line 211), untouched. `_blake2/blake2s_impl.c` compiled. No full build/link was attempted.
- `git -C cpython diff --check -- Objects/picklebufobject.c` and `git diff --check -- scripts/vc6-picklebuf-raw-c89.test.py` — exit 0. Exact baseline tag/commit verified unchanged.

Files changed by this slice: `cpython/Objects/picklebufobject.c` (only declarations within `picklebuf_raw()`), new `scripts/vc6-picklebuf-raw-c89.test.py`, and this status entry. This is compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next: force-fresh probe before editing, then isolate only the first designated initializer blocker at `picklebuf_as_buffer` line 142 as its own test-first slice. Do not claim port completion.

---

## Previous run (`mutablemapping_update()` len C89 declaration; frontier advances)

Date: 2026-10-09 13:58 UTC

Read this status and `README.md` before acting. The invoked skill reference `references/python-3-win9x-msvc6.md` was not found in the accessible project/skill files; prior status likewise records it unavailable. Preserved all pre-existing outer and detached CPython changes. No reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. CPython exact baseline remains tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded `_blake2/blake2s_impl.c` success and `mutablemapping_update()` late `Py_ssize_t len` blocker were reconfirmed with a forced-fresh MSVC600/Wine source-list probe before editing. One focused Codex CLI lane (`codex-cli 0.153.4`, OpenAI provider, workspace-write, ephemeral; session `01a120ef-d52c-7423-aebc-d991acb9f188`) followed strict TDD. It snapshotted and hashed all 151 pre-existing dirty/untracked paths across the outer and nested repositories. It added a C89 compile/runtime regression covering 10 argument/keyword/error/order cases, observed expected RED at the mixed declaration, then moved only `Py_ssize_t len` to the function declaration block and retained the assignment immediately after the existing assertion. Independent snapshot comparison confirmed all other 150 baseline paths and both indexes unchanged; `PORT_STATUS.md` remained untouched by the lane. No other defect family was edited.

Exact verification:

- Before-change command: `XDG_RUNTIME_DIR="$PWD/build/cron-20261009Tcurrent/runtime-run" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261009Tcurrent/probe-current.log 2>&1` — actual probe exit 2; summary `total=102 compiled=101 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First stable diagnostics were C2143 at `Objects/odictobject.c(2299)` and C2065 `len` at `(2300)`. Log: `build/cron-20261009Tcurrent/probe-current.log`.
- TDD RED: `python3 scripts/vc6-odict-update-len-c89.test.py cpython/Objects/odictobject.c` — exit 1, expected C90 mixed-declaration diagnostic at the late `Py_ssize_t len` declaration. GREEN: same command after edit — exit 0, 10 C89 compile/runtime cases passed.
- Applicable regression loop: `for test in scripts/vc6-odict-*.test.py; do python3 "$test" cpython/Objects/odictobject.c; result=$?; echo "$test exit=$result"; if test "$result" -ne 0; then exit "$result"; fi; done` — exit 0; all six odict tests passed individually.
- Post-change forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/cron-20261009Tcurrent/runtime-post" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261009Tcurrent/probe-post-len.log 2>&1` — actual probe exit 2; summary `total=103 compiled=102 cached=0 skipped=0`. `_blake2/blake2s_impl.c` and `Objects/odictobject.c` compiled. Former `len` diagnostics are gone. First blocker advances to `Objects/picklebufobject.c`: C2059 at lines 142 and 208 on designated initializers; C2275/C2065 at line 162 (`PyObject *m`) and line 166 (`PyMemoryViewObject *mv`), with later pointer errors cascading. Log: `build/cron-20261009Tcurrent/probe-post-len.log`.
- `git diff --check -- PORT_STATUS.md scripts/vc6-odict-update-len-c89.test.py` and `git -C cpython diff --check -- Objects/odictobject.c` — exit 0. Exact baseline tag and commit checked unchanged.

Files changed by this slice: `cpython/Objects/odictobject.c` (one declaration/assignment split), new `scripts/vc6-odict-update-len-c89.test.py`, and `PORT_STATUS.md`. The applicable focused tests and compiler probe validate compiler-frontier progress only. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next: freshly probe before editing, then isolate the first current `picklebufobject.c` defect family only. Do not claim port completion.

---

## Previous run (mutablemapping_update `len` frontier reconfirmed; coding lane unavailable)

Date: 2026-10-09 09:40 UTC

Read `PORT_STATUS.md`, `README.md`, and attempted the required CPython Win9x/MSVC6 reference before acting. The reference file was not present at `/home/ubuntu/.hermes/skills/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md`; no source changes were made in this diagnostics-only run. Preserved the pre-existing dirty outer and detached CPython work; no reset, clean, stash, discard, commit, push, publication, or patch regeneration. CPython remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded `mutablemapping_update()` frontier remains current after a forced-fresh MSVC600/Wine source-list probe. `_blake2/blake2s_impl.c` compiled; the first stable blocker remains the late `Py_ssize_t len` declaration in `Objects/odictobject.c`, followed by the undeclared `len` use. One focused coding-agent delegation was attempted for this exact slice, but failed before child startup because the runtime lacks the `anthropic` package and lazy installs are disabled. No test or production source was changed; no RED/GREEN cycle or regression suite was claimed.

Exact verification:

- `XDG_RUNTIME_DIR="$PWD/build/cron-20261009Tcurrent/runtime-rerun" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261009Tcurrent/cron-reprobe.log 2>&1` — actual probe exit 2; summary `total=102 compiled=101 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First stable diagnostics: C2143 at `odictobject.c(2299)` and C2065 `len` at `(2300)`. Capture: `build/cron-20261009Tcurrent/cron-reprobe.log`.
- One focused coding-subagent delegation for the `len` declaration family failed before child startup: Anthropic package missing; lazy installs disabled. No child modifications occurred.
- `git -C cpython describe --tags --exact-match HEAD` → `v3.11.16`; `git -C cpython rev-parse HEAD` → `41388c9cb160d0886d5ca00d2e6c8782608a4549`. `git diff --check -- PORT_STATUS.md` and `git -C cpython diff --check -- Objects/odictobject.c` exited 0.
- No source/test regressions were run because no source or test changed. The MSVC environment emitted no standalone compiler banner. No link, Wine interpreter execution, or real Windows 98 SE execution was produced.

Files changed this run: `PORT_STATUS.md` only. Compiler-probe progress only; no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next: retry the single focused TDD `len` declaration slice when a coding agent can start; keep assignment at its existing evaluation point. Do not claim port completion.

---

## Latest run (confirmed `mutablemapping_update()` frontier; coding lane unavailable)

Date: 2026-10-09 UTC

Read `PORT_STATUS.md`, `README.md`, and `references/python-3-win9x-msvc6.md` before acting. Preserved existing outer and detached CPython changes; no reset, clean, stash, discard, commit, push, publication, or patch regeneration. CPython remains at exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The previously recorded `mutablemapping_update()` first blocker was freshly confirmed by a forced-fresh MSVC600/Wine source-list probe. `_blake2/blake2s_impl.c` compiled; first blocker remains C2143 at `Objects/odictobject.c(2299)` on the late `Py_ssize_t len` declaration, followed by C2065 `len` at 2300. A single focused coding-agent delegation was attempted as required, but failed before child startup because the Hermes runtime lacks the `anthropic` package and lazy installs are disabled. No source or test changes were made in this run; this is diagnostics-only.

Exact verification:

- `XDG_RUNTIME_DIR="$PWD/build/cron-20261009-rerun/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261009-rerun/pre-change-probe.log 2>&1` — actual probe exit 2; summary `total=102 compiled=101 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First stable diagnostics: C2143 at `odictobject.c(2299)` and C2065 `len` at `(2300)`. Capture: `build/cron-20261009-rerun/pre-change-probe.log`.
- One focused coding-subagent delegation for exactly the `mutablemapping_update()` declaration family failed before child startup: Anthropic package missing; lazy installs disabled. No child modifications occurred.
- No source or regression test was changed/run in this diagnostics-only run. The directly applicable odict test set was already recorded as passing in the immediately preceding run.
- Probe output showed the MSVC environment setup text but did not include a standalone compiler version banner. No compiler-link, Wine interpreter, or real Windows 98 SE result was produced.
- CPython baseline remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

Files changed this run: `PORT_STATUS.md` only. Compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next: retry one isolated TDD coding lane for only the confirmed `Py_ssize_t len` declaration in `mutablemapping_update()` when a coding-agent provider is available; retain the assignment at its existing post-assertion point. Do not claim port completion.

---

## Latest run (`mutablemapping_update_arg` iterator/key declarations; frontier advances)

Date: 2026-10-09 03:24 UTC

Read `PORT_STATUS.md`, `README.md`, and `references/python-3-win9x-msvc6.md` before acting. Preserved all existing outer and detached CPython work. No reset, clean, stash, discard, commit, push, publication, or patch regeneration. CPython remains at exact release tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded `mutablemapping_update_arg()` frontier was freshly confirmed using the forced-fresh MSVC600/Wine source-list probe. `_blake2/blake2s_impl.c` compiled; summary `total=102 compiled=101 cached=0 skipped=0`. First blocker: C2275/C2065 at `Objects/odictobject.c(2252)` for late `PyObject *iterator`, followed by the same declaration-family issue at `(2257)` for `PyObject *key`. One focused Codex CLI lane (`codex-cli 0.153.4`, workspace-write, ephemeral; session `01a11eab-b100-7c81-a014-403f0be55bc3`) followed strict TDD. It added a C89 compile/runtime regression for the exact keys branch, observed expected RED on only the targeted late declarations, then moved only `iterator` and `key` declarations to the start of the branch. `iterator = PyObject_GetIter(keys)` remains after the existing NULL check and at its original evaluation point; `key` initialization remains in the loop. No later `len` declaration was touched. The delegated lane's preservation hash check verified all 149 other pre-existing dirty files were unchanged.

Exact verification:

- Pre-change forced-fresh command: `XDG_RUNTIME_DIR="$PWD/build/cron-20261009Tcurrent/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261009Tcurrent/pre-change-probe.log 2>&1` — actual probe exit 2; summary `total=102 compiled=101 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First diagnostics: C2275/C2065 at `odictobject.c(2252)` and C2275/C2065 at `(2257)`. Capture: `build/cron-20261009Tcurrent/pre-change-probe.log`.
- TDD RED: `python3 scripts/vc6-odict-update-arg-iterator-c89.test.py cpython/Objects/odictobject.c` — exit 1, expected C90 mixed-declaration diagnostics exactly at the `iterator` and `key` declarations. GREEN: same command after edit — exit 0, eight runtime evaluation/cleanup cases passed.
- Applicable odict regressions, each exit 0: `vc6-odict-list-c89.test.py` (24 cases), `vc6-odict-number-c89.test.py` (36 field mappings), `vc6-odict-or-c89.test.py` (8 cases), and `vc6-odict-update-arg-func-c89.test.py` (6 cases). Aggregate loop exit 0. `git diff --check` for the new test and nested `git diff --check -- Objects/odictobject.c` — exit 0.
- Post-change forced-fresh probe with `XDG_RUNTIME_DIR="$PWD/build/cron-20261009Tcurrent/runtime-post"` and otherwise the same command — actual probe exit 2; summary `total=102 compiled=101 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. The former diagnostics at 2252 and 2257 are gone; first blocker advances to `odictobject.c(2299)` C2143 / `(2300)` C2065 on `len`. Capture: `build/cron-20261009Tcurrent/post-change-probe.log`.
- Exact CPython tag and commit verified unchanged. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified.

Files changed by this slice: `cpython/Objects/odictobject.c` (only iterator/key declarations in `mutablemapping_update_arg()`), new `scripts/vc6-odict-update-arg-iterator-c89.test.py`, and this status entry. Compiler-probe progress only. Next frontier: force-fresh probe before editing, then address only the actual first blocker (currently the late `Py_ssize_t len` in `mutablemapping_update()`, line 2299). Do not claim port completion.

---

## Previous run (`mutablemapping_update_arg` declaration family; frontier advances)

Date: 2026-10-09 01:13 UTC

Read the existing status, `README.md`, and `references/python-3-win9x-msvc6.md` before acting. Preserved existing outer and detached CPython work; no reset, clean, stash, discard, commit, push, publication, or patch regeneration. CPython remains at exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded `mutablemapping_update_arg()` frontier was freshly confirmed before editing with a forced-fresh MSVC600/Wine source-list probe. `_blake2/blake2s_impl.c` compiled; summary `total=102 compiled=101 cached=0 skipped=0`. First blocker: C2275/C2065 at `Objects/odictobject.c(2242)` on the late `PyObject *func` declaration. Native Hermes coding delegation was unavailable because the Anthropic package is not installed and lazy installs are disabled. One focused Codex CLI lane (`codex-cli 0.153.4`, workspace-write, ephemeral) then followed TDD: added a prefix-only C89 compile/runtime regression, observed expected RED before changing production, and moved only `PyObject *func` to the function's initial declaration group. The change leaves lookup after the exact-dict path, preserving execution/cleanup/error order. Distinct later declarations at lines 2252/2257 and the `mutablemapping_update()` blocker at 2298-2299 were not touched. The lane reports all 148 pre-existing dirty/untracked files remained byte-identical; independent diff inspection confirms the only new source hunk in already-dirty `odictobject.c` is this declaration relocation.

Exact verification:

- Pre-change command: `XDG_RUNTIME_DIR="$PWD/build/cron-20261009Tcurrent/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261009Tcurrent/pre-change-probe.log 2>&1` — actual probe exit 2; summary `total=102 compiled=101 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First stable errors: C2275/C2065 at `odictobject.c(2242)` (`PyObject`, `func`), followed by separate errors at 2252, 2257, 2298-2299. Capture: `build/cron-20261009Tcurrent/pre-change-probe.log`.
- TDD RED: `python3 scripts/vc6-odict-update-arg-func-c89.test.py cpython/Objects/odictobject.c` — exit 1, expected `ISO C90 forbids mixed declarations and code` at the late declaration. GREEN: same command after source change — exit 0, `mutablemapping_update_arg prefix C89 compile and dict/lookup ordering: PASS (6 cases)`.
- Applicable odict regressions, all exit 0: the new `vc6-odict-update-arg-func-c89.test.py` (6 cases), `vc6-odict-list-c89.test.py` (24 cases), `vc6-odict-number-c89.test.py` (36 mappings), and `vc6-odict-or-c89.test.py` (8 cases). Independently rerun together after the coding lane; aggregate exit 0.
- Post-change forced-fresh probe with `XDG_RUNTIME_DIR="$PWD/build/cron-20261009Tcurrent/runtime-post"` and otherwise the same command — actual probe exit 2; summary still `total=102 compiled=101 cached=0 skipped=0`. Former line-2242 errors are gone. First blocker advances to `odictobject.c(2252)` C2275/C2065 (`PyObject *iterator`); separate errors remain at 2257 (`key`) and 2298-2299 (`len`). Capture: `build/cron-20261009Tcurrent/post-change-probe.log`.
- `git diff --check -- scripts/vc6-odict-update-arg-func-c89.test.py` and `git -C cpython diff --check -- Objects/odictobject.c` — exit 0. Exact baseline tag/commit unchanged.

Files changed by this slice: `cpython/Objects/odictobject.c` (only the `func` declaration relocation within `mutablemapping_update_arg()`), new `scripts/vc6-odict-update-arg-func-c89.test.py`, and this status entry. Probe logs are under ignored `build/cron-20261009Tcurrent/`. Compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution verified. Next frontier: forced-fresh probe first, then address only the first actual blocker, currently `PyObject *iterator` at `odictobject.c(2252)`. Do not claim port completion.

---

## Previous run (`odictiter_reduce` C89 declaration; compiler frontier advances)

Date: 2026-10-08 23:00 UTC

Read `PORT_STATUS.md`, `README.md`, and `references/python-3-win9x-msvc6.md` before acting. Preserved the existing outer and detached CPython changes; no reset, clean, stash, discard, commit, push, publication, or patch regeneration. CPython remains at exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded `_blake2/blake2s_impl.c` state and `odictiter_reduce()` first blocker were freshly checked with a forced-fresh MSVC600/Wine source-list probe. `_blake2/blake2s_impl.c` compiled; the first blocker was C2275/C2065 at `Objects/odictobject.c(1839)` on `PyObject *list`. One focused Codex CLI lane (`codex-cli 0.153.4`, OpenAI provider, workspace-write, ephemeral; session `01a11db9-b3c7-7501-90a5-628fa8390bd5`) followed strict TDD. It added `scripts/vc6-odict-list-c89.test.py`, observed the expected C90 mixed-declaration RED before production edits, then hoisted only the `list` declaration into `odictiter_reduce()`'s declaration group. Its `PySequence_List((PyObject*)&tmp)` initializer remains at its original point after both increfs, preserving evaluation timing, refcounts, cleanup, and error flow. No later function or blocker was changed. Preservation snapshot comparison confirmed every pre-existing dirty/untracked file remained byte-identical except the intended production edit; `PORT_STATUS.md` was then updated for this run.

Exact verification:

- Pre-change forced-fresh command: `XDG_RUNTIME_DIR="$PWD/build/cron-20261008Tcurrent/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261008Tcurrent/reprobe.log 2>&1` — actual probe exit 2; summary `total=102 compiled=101 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First stable errors: C2275/C2065 at `odictobject.c(1839)` for `PyObject *list`; subsequent independent diagnostics included lines 2241, 2251, 2256, and 2297-2298. Wine startup initially failed before this capture because the server lock path under `/run/user/1000/wine` was read-only; `wine cmd /c ver` using the same project-local runtime then succeeded, and the fresh probe succeeded. Capture: `build/cron-20261008Tcurrent/reprobe.log`.
- TDD RED: `python3 scripts/vc6-odict-list-c89.test.py cpython/Objects/odictobject.c` before production edit — exit 1, expected `ISO C90 forbids mixed declarations and code` at the initialized `PyObject *list` declaration. GREEN: same command after edit — exit 0, `odictiter_reduce C89 compile and copy/incref/list/cleanup/ownership/failure order: PASS (24 cases)`.
- Applicable odict regressions: `for test in scripts/vc6-odict-list-c89.test.py scripts/vc6-odict-or-c89.test.py scripts/vc6-odict-number-c89.test.py; do python3 "$test" cpython/Objects/odictobject.c || exit "$?"; done` — exit 0. All three passed: list/order/ownership (24 cases), `odict_or` operation ordering (8 cases), and all 36 numeric-method mappings.
- Post-change forced-fresh command: `XDG_RUNTIME_DIR="$PWD/build/cron-20261008Tcurrent/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261008Tcurrent/reprobe-retry.log 2>&1` — actual probe exit 2; summary `total=102 compiled=101 cached=0 skipped=0`. `_blake2/blake2s_impl.c` and `Objects/odictobject.c` compiled; former diagnostics at line 1839 are gone. First stable blocker advances to `odictobject.c(2242)`: C2275 on `PyObject` and C2065 on `func`; further distinct diagnostics remain at 2252, 2257, and 2298-2299. Capture: `build/cron-20261008Tcurrent/reprobe-retry.log`.
- `git diff --check -- scripts/vc6-odict-list-c89.test.py` and `git -C cpython diff --check -- Objects/odictobject.c` — exit 0. `git -C cpython describe --tags --exact-match HEAD` → `v3.11.16`; `git -C cpython rev-parse HEAD` and `git -C cpython rev-parse 'v3.11.16^{commit}'` both → `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

Files changed by this run: `cpython/Objects/odictobject.c` (only the `odictiter_reduce()` declaration split), new `scripts/vc6-odict-list-c89.test.py`, and this status entry. Compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next frontier: freshly probe before editing, then isolate only the first current blocker at `odictobject.c(2242)` (`PyObject *func`). Do not claim port completion.

---

## Previous run (`odict_as_number` positional initializer; frontier advances)

Date: 2026-10-08 20:48 UTC

Read `PORT_STATUS.md`, `README.md`, and `references/python-3-win9x-msvc6.md` before acting. Preserved existing outer and detached CPython work; no reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. CPython remains at exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded compiler frontier was freshly checked with a forced-fresh MSVC600/Wine source-list probe before edits. `_blake2/blake2s_impl.c` compiled. The first blocker was the designated initializer in `Objects/odictobject.c`'s `odict_as_number` at line 900 (C2059). One focused Codex CLI lane (`codex-cli 0.153.4`, OpenAI provider, workspace-write, ephemeral; session `01a11d40-75d0-7623-8a3b-dc382dcca4fe`) followed TDD. It added `scripts/vc6-odict-number-c89.test.py`, which compiled the exact table as C89 and checks all 36 `PyNumberMethods` fields by semantic name. The test failed before the source edit as expected, then passed after replacing only `odict_as_number` with a positional initializer: `odict_or` remains in `nb_or`, `odict_inplace_or` remains in `nb_inplace_or`, and all 34 other fields are zero. No later `odictobject.c` functions were edited. All pre-existing changes remain preserved.

Exact verification:

- Pre-change forced-fresh command: `XDG_RUNTIME_DIR="$PWD/build/cron-current/runtime-20261008T203722Z" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — actual probe exit 2; summary `total=102 compiled=101 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. The first stable blocker was C2059 at `odictobject.c(900)` on the `.nb_or` designated initializer. Capture: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1791491842-1537598-7ce0.log`.
- TDD RED: the new `python3 scripts/vc6-odict-number-c89.test.py cpython/Objects/odictobject.c` failed before production change (expected C89 compile failure for designated initialization). GREEN: same test after the edit — exit 0, `odict_as_number C89 compile and all 36 semantic field mappings: PASS`. `python3 scripts/vc6-odict-or-c89.test.py cpython/Objects/odictobject.c` — exit 0, operation-order runtime regression passed (8 cases).
- Applicable frontier regression harness: `XDG_RUNTIME_DIR="$PWD/build/odict-number-slice/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.test.sh > build/odict-number-slice/frontier-test.log 2>&1` — exit 1; 260 checks passed, with two known failures: console type detection/control-cleanup order (line 215) and numeric dispatch (`ValueError: substring not found`, line 239). No harness-wide pass claimed. `bash scripts/vc6-probe.test.sh` also exited 1 because its compiler-diagnostic-output check failed; other checks in that script passed. No broad pass claimed.
- Post-change forced-fresh command: `XDG_RUNTIME_DIR="$PWD/build/odict-number-slice/runtime-retry" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — actual probe exit 2; summary `total=102 compiled=101 cached=0 skipped=0`. `_blake2/blake2s_impl.c` and `Objects/odictobject.c` compiled; the prior line-900 C2059 is gone. First remaining stable errors are C2275/C2065 at `odictobject.c(1839)` for `PyObject *list`, followed by independent blockers at 2241, 2251, 2256, and 2297-2298. These are untouched. Capture: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1791492247-1537598-3a80.log`.
- Focused verification rerun after the coding lane: both odict regression tests exited 0; scoped outer/nested `git diff --check` exited 0. The exact CPython tag/commit remain unchanged. The changed production initializer is the only new modification within the already-dirty `cpython/Objects/odictobject.c`; `odict_or()` and the remainder of `odictobject.c` retain their pre-run bytes.

Files changed by this run: `cpython/Objects/odictobject.c` (positional `odict_as_number` initializer), new `scripts/vc6-odict-number-c89.test.py`, and this status entry. This is compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next frontier: freshly probe before editing; if confirmed, isolate only the current first blocker in `odictobject.c` at line 1839 (`PyObject *list`). Do not claim port completion.

---

## Latest run (`odict_or` first C89 declaration family; frontier advances)

Date: 2026-10-08 18:32 UTC

Read this status, `README.md`, and the CPython Win9x/MSVC6 reference before acting. Preserved all existing dirty outer and detached CPython state. No reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. CPython remains at exact baseline tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded `_PyObject_DebugMallocStats()` frontier was stale. A forced-fresh VC6/Wine source-list probe confirmed `_blake2/blake2s_impl.c` compiles and the first blocker is `Objects/odictobject.c`, at the late `PyObject *new` declaration inside `odict_or()` (C2275/C2065 at line 875). The first focused Hermes coding-agent dispatch did not start because the Anthropic package is unavailable and lazy installs are disabled. One focused Codex CLI lane (`codex-cli 0.153.4`, OpenAI provider, workspace-write, ephemeral; session `01a11cc7-e355-7182-ba94-9a3530930344`) then performed strict TDD. It added an exact-function C89 compile/runtime regression, observed the expected RED before production edit, and moved only the declaration of `new` into the function's declaration group; its assignment remains at the original point after the `PyDict_Check()` rejection. The regression exercises operand selection, rejection, constructor failure, update failure/cleanup, and success in eight cases. The distinct designated-initializer and later function blockers remain untouched. The coding lane verified all 145 pre-existing dirty/untracked files byte-for-byte unchanged.

Exact verification:

- Pre-change forced-fresh command: `XDG_RUNTIME_DIR="$PWD/build/cron-current/runtime-20261008T182533Z" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — actual probe exit 2; summary `total=102 compiled=101 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First stable diagnostics: C2275/C2065 at `odictobject.c(875)` for `PyObject *new`; separate diagnostics at 899, 1804, 2206-2221, and 2262-2263 remained. Capture: `build/cron-current/cron-20261008T182533Z-current-reprobe.log`.
- TDD RED: `python3 scripts/vc6-odict-or-c89.test.py cpython/Objects/odictobject.c` — exit 1 before source edit; expected ISO C90 mixed-declaration diagnostic (`-Wdeclaration-after-statement`). GREEN: same command after edit — exit 0, `odict_or C89 compile and operand/rejection/construction/update/cleanup order: PASS (8 cases)`.
- Applicable broader regression harness: `bash scripts/vc6-probe-pythoncore-frontier.test.sh > /tmp/odict-or-frontier-tests.log 2>&1` — exit 1. It reports two existing unrelated failures: console type detection/control-cleanup order (line 215) and numeric dispatch (`ValueError: substring not found`, line 239). All other logged checks passed; no full-harness pass claimed.
- Post-change forced-fresh command: `XDG_RUNTIME_DIR="$PWD/build/cron-current/runtime-20261008T183212Z" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — actual probe exit 2; summary `total=102 compiled=101 cached=0 skipped=0`. `_blake2/blake2s_impl.c` and the edited `odictobject.c` compiled past the `odict_or()` declaration. The former line-875 diagnostics are gone. First remaining diagnostic is C2059 at `odictobject.c(900)` for the designated initializer; subsequent independent blockers remain at 1805, 2207, 2217, 2222, and 2263-2264. Capture: `build/cron-current/cron-20261008T183212Z-post-odict.log`.
- Independent focused test rerun and `git -C cpython diff --check -- Objects/odictobject.c` / `git diff --check -- scripts/vc6-odict-or-c89.test.py` — exit 0. Baseline exact tag/commit verified unchanged.

Files changed by this run: `cpython/Objects/odictobject.c` (only the `odict_or()` declaration/assignment split), new `scripts/vc6-odict-or-c89.test.py`, and this status entry. This is compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next frontier: re-probe forced-fresh before edits; address only the first current `odictobject.c` diagnostic, the separate designated initializer at line 900. Do not claim port completion.

---

## Latest run (`_PyObject_DebugMallocStats` declaration family; frontier advances)

Date: 2026-10-08 16:24 UTC

Read `PORT_STATUS.md`, `README.md`, and `references/python-3-win9x-msvc6.md` before acting. Preserved all existing outer and detached CPython changes; no reset, clean, stash, discard, commit, push, publication, or patch regeneration. CPython baseline remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded `_PyObject_DebugMallocStats()` frontier was confirmed by a forced-fresh probe before editing. One focused Codex CLI lane (`codex-cli 0.153.4`, OpenAI provider, workspace-write, ephemeral; session `01a11c4e-a3a7-7b73-a20f-1f4c20e4a4f4`) used strict TDD for this function only. The new focused test failed before production changes with the expected declaration-order assertion. Then only local declarations were hoisted before the `_PyMem_PymallocEnabled()` early-return guard. All scalar initializers were converted to assignments after the guard at the original execution point and in original order. The guard still returns before those initializations, array zeroing is unchanged, and the rest of the function is asserted byte-semantically through normalized token order. No other function was edited by this slice.

Exact verification:

- Pre-change forced-fresh command: `XDG_RUNTIME_DIR="$PWD/build/cron-current/runtime-cron-$(date -u +%Y%m%dT%H%M%SZ)" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — actual probe exit 2; `_blake2/blake2s_impl.c` compiled; summary `total=101 compiled=100 cached=0 skipped=0`. First stable diagnostics were C2143 at `Objects/obmalloc.c(3035-3036)`, then C2275/C2146/C2065 at `(3038-3042)`. Capture: `build/cron-current/cron-20261008-current-reprobe.log`.
- TDD RED: `python3 scripts/vc6-obmalloc-debugmallocstats-c89.test.py cpython/Objects/obmalloc.c` — exit 1 before source edit with the expected assertion that declarations must precede the guard.
- TDD GREEN and complete focused obmalloc regressions: `python3 scripts/vc6-obmalloc-debugmallocstats-c89.test.py cpython/Objects/obmalloc.c && for test in scripts/vc6-obmalloc-*.test.py; do python3 "$test" cpython/Objects/obmalloc.c cpython/Include/internal/pycore_pymem.h || exit "$?"; done` — exit 0. All 16 discovered `vc6-obmalloc-*.test.py` scripts exited 0.
- Post-change forced-fresh command: `XDG_RUNTIME_DIR="$PWD/build/cron-current/runtime-cron-$(date -u +%Y%m%dT%H%M%SZ)-post" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — actual probe exit 2; summary `total=102 compiled=101 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled, and the former `obmalloc.c(3035-3050)` diagnostics are gone. First stable blocker advanced to `Objects/odictobject.c`: C2275/C2065 at lines 875, 1804, 2206-2221 and C2059/C2143/C2065 around 899 and 2262-2263. Capture: `build/cron-current/cron-20261008-debugmallocstats-post.log`.
- `git diff --check -- PORT_STATUS.md scripts/vc6-obmalloc-debugmallocstats-c89.test.py` and `git -C cpython diff --check -- Objects/obmalloc.c` — exit 0. CPython exact tag and commit unchanged.

Files changed by this run: `cpython/Objects/obmalloc.c` (only `_PyObject_DebugMallocStats()` within the existing dirty source file), new `scripts/vc6-obmalloc-debugmallocstats-c89.test.py`, and this status entry. Compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. MSVC6 banner was not separately recorded in this run. Next frontier: fresh forced-fresh probe before edits, then isolate only the first current `Objects/odictobject.c` blocker using its own TDD slice. Do not claim port completion.

---

## Latest run (fresh `_PyObject_DebugMallocStats` frontier; coding delegation unavailable)

Date: 2026-10-08 14:12 UTC

Read `PORT_STATUS.md`, `README.md`, and `references/python-3-win9x-msvc6.md` before acting. Preserved all pre-existing outer and detached CPython changes; no reset, clean, stash, discard, commit, push, publication, or patch regeneration. Baseline remains CPython `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded `_PyObject_DebugMallocStats()` blocker was freshly reprobed with forced-fresh MSVC600/Wine compilation. `_blake2/blake2s_impl.c` compiled; the first stable blocker remains in `Objects/obmalloc.c` at `_PyObject_DebugMallocStats()`. VC6 reports C2143 at lines 3035-3036, where declarations follow the executable `_PyMem_PymallocEnabled()` guard/return, then C2275/C2146/C2065 for the `size_t` declarations at lines 3038-3042 and cascades. One focused coding-subagent delegation was attempted for only this function, with strict TDD and preservation constraints, but failed before child startup because the Anthropic package is unavailable and lazy installs are disabled. No source or test changes were made. This run is diagnostics-only; declaration/evaluation handling still requires a test-first implementation.

Exact verification:

- `XDG_RUNTIME_DIR="$PWD/build/cron-current/runtime-cron-$(date -u +%Y%m%dT%H%M%SZ)" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — actual probe exit 2; summary `total=101 compiled=100 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First diagnostics: C2143 at `obmalloc.c(3035-3036)`, then C2275/C2146/C2065 at `(3038-3042)`. Full captured tool output: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1791468469-1438139-8770.log`.
- Focused coding delegation — failed before child startup: `anthropic` package required; lazy installs disabled. No child edits.
- `git -C cpython describe --tags --exact-match HEAD` → `v3.11.16`; `git -C cpython rev-parse HEAD` → `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

Files changed this run: `PORT_STATUS.md` only. All pre-existing source/test modifications remain untouched. Compiler-probe progress only; no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next: retry a focused TDD coding lane for `_PyObject_DebugMallocStats()` when a coding agent can start; keep declarations needed before the early guard distinct from later locals where moving initialization could change timing. Do not claim port completion.

---

## Previous latest run (fresh `_PyObject_DebugMallocStats` frontier; coding lane unavailable)

Date: 2026-10-08 UTC

Read `PORT_STATUS.md`, `README.md`, and `references/python-3-win9x-msvc6.md` before acting. Preserved the existing outer and detached CPython work; no reset, clean, stash, discard, commit, push, publication, or patch regeneration. Baseline remains CPython `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The previously recorded post-`_PyMem_DebugCheckAddress()` compiler state was freshly reprobed. The forced-fresh source-list probe compiled `_blake2/blake2s_impl.c`; the actual first stable blocker has advanced to `Objects/obmalloc.c` in `_PyObject_DebugMallocStats()`. VC6 first reports C2143 at lines 3035-3036, where declarations follow the executable `_PyMem_PymallocEnabled()` guard/return. It then reports C2275/C2146/C2065 for the subsequent `size_t` declarations at lines 3038-3042, followed by cascades through later locals. No source or test change was made: the required single focused coding-subagent attempt failed before startup because the Anthropic package is unavailable and lazy installs are disabled. This is diagnostic-only; the function’s exact declaration/evaluation requirements still need a TDD test before implementation.

Exact verification:

- `XDG_RUNTIME_DIR="$PWD/build/cron-current/runtime-cron-20261008-rerun" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-current/cron-20261008-current-frontier.log 2>&1` — actual probe exit 2; summary `total=101 compiled=100 cached=0 skipped=0`. First stable diagnostics: C2143 at `obmalloc.c(3035-3036)`, then C2275/C2146/C2065 at `(3038-3042)`; `_blake2/blake2s_impl.c` compiled. Full capture: `build/cron-current/cron-20261008-current-frontier.log`.
- Focused coding delegation for only the confirmed `_PyObject_DebugMallocStats()` declaration family — failed before child startup: missing `anthropic` package; lazy installs disabled. No child edits were applied.
- Nested baseline checks: exact tag `v3.11.16` and commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`. `git diff --check -- PORT_STATUS.md` and `git -C cpython diff --check -- Objects/obmalloc.c` — exit 0.

Files changed this run: `PORT_STATUS.md` only. All pre-existing source/test modifications remain untouched. This is compiler-probe progress only; no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next: a focused TDD lane for the declarations in `_PyObject_DebugMallocStats()` when a coding agent can start; preserve initialization/evaluation relative to the early return and do not touch later blockers.

---

## Previous latest run (`_PyMem_DebugCheckAddress` C89 declarations hoisted; compiler confirmation blocked)

Date: 2026-10-08 UTC

Read `PORT_STATUS.md`, `README.md`, and `references/python-3-win9x-msvc6.md` before acting. Preserved all pre-existing outer and detached CPython work; no reset, clean, stash, discard, commit, push, publication, or patch regeneration. CPython baseline remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded `_PyMem_DebugRawRealloc()` frontier was freshly confirmed before editing: `_blake2/blake2s_impl.c` compiled, with first stable diagnostics in `Objects/obmalloc.c(2798-2802)` inside `_PyMem_DebugCheckAddress()`. One focused Codex CLI lane (`codex-cli 0.153.4`, OpenAI provider, workspace-write, ephemeral; session `01a11af1-dee3-7112-adbc-cc56f4423bb4`) followed TDD and changed only that function plus a new focused test. It moved the `q` declaration before `assert` and kept `q = (const uint8_t *)p` after the assertion, preserving the pointer-cast evaluation point and all validation/error order. Test observed expected RED before production edit, then GREEN. All 15 `scripts/vc6-obmalloc-*.test.py` scripts passed with the required `pycore_pymem.h` argument for tracemalloc. Codex's forced-fresh probe attempts could not start the compiler: Wine repeatedly attempted to create `/run/user/1000/wine/server-801-136fb0/lock` and failed with `Read-only file system`; both attempts ended at `Modules/getpath.c`, `total=1 compiled=0 cached=0`. Thus the compiler frontier after this source edit is unverified and no compiler advancement is claimed.

Exact verification:

- Before-edit fresh probe: `XDG_RUNTIME_DIR="$PWD/build/cron-current/runtime-cron-20261008-confirm" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-current/cron-20261008-confirm.log 2>&1` — wrapper exit 0 while recording actual probe exit 2; `total=101 compiled=100 cached=0 skipped=0`. First stable diagnostics: C2143 at `obmalloc.c(2798)`, C2275/C2146/C2065 on `size_t nbytes` at `(2799)`, followed by late declaration diagnostics at `(2800-2802)`. `_blake2/blake2s_impl.c` compiled.
- TDD RED: `python3 scripts/vc6-obmalloc-debugcheckaddress-c89.test.py cpython/Objects/obmalloc.c` — exit 1 with expected entry-declaration assertion before production edit. GREEN: same command after edit — exit 0.
- Applicable regressions: `for test in scripts/vc6-obmalloc-*.test.py; do python3 "$test" cpython/Objects/obmalloc.c cpython/Include/internal/pycore_pymem.h || exit "$?"; done` — all 15 exited 0.
- Post-edit forced-fresh probe attempted twice, exact command prefix `XDG_RUNTIME_DIR="$PWD/build/cron-current/runtime-codex-check" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh`; actual exit 1 both times before compilation, despite project-local runtime directory creation. Logs: `build/cron-current/vc6-debugcheckaddress-frontier.log` and `build/cron-current/vc6-debugcheckaddress-frontier-retry.log`. Both show `sock_init: ERROR in sock_check_pollhup()`, Wine lock creation failure on read-only `/run/user/1000`, and `total=1 compiled=0 cached=0 skipped=0`. This is a Wine startup failure, not a compiler diagnostic.
- Independent checks: focused regression rerun and scoped `git diff --check` for `cpython/Objects/obmalloc.c` and the new test — exit 0. CPython tag/commit unchanged.

Files changed by this run: `cpython/Objects/obmalloc.c`, new `scripts/vc6-obmalloc-debugcheckaddress-c89.test.py`, and this status entry. Compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution. Next: restore/diagnose a writable Wine server runtime, then force a fresh probe before selecting any further edit. Do not infer the next frontier from stale diagnostics.

---

## Previous latest run (fresh obmalloc frontier confirmed; coding agent unavailable)

Date: 2026-10-08 07:51 UTC

Read `PORT_STATUS.md`, `README.md`, and the CPython Win9x/MSVC6 reference before acting. Preserved the existing outer and detached CPython work; no reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. CPython remains at exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded `_PyMem_DebugRawRealloc()` blocker at `obmalloc.c(2650-2658)` was freshly re-probed with forced-fresh VC6/Wine compilation. `_blake2/blake2s_impl.c` compiled; the first stable blocker has advanced to `Objects/obmalloc.c(2798-2802)`, late declarations in a subsequent function. No implementation was attempted because the required focused coding-agent delegation failed before startup: Hermes reported the Anthropic package is unavailable and lazy installs are disabled. Per the delegated-lane requirement, no production or test files were changed. The current first blocker is diagnostic evidence only; its specific function and safe isolated TDD test have not yet been established in this run.

Exact verification:

- Forced-fresh command: `XDG_RUNTIME_DIR="$PWD/build/cron-current/runtime-cron-20261008-realloc-reprobe" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-current/cron-20261008-realloc-reprobe.log 2>&1` — actual probe exit 2; summary `total=101 compiled=100 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First stable diagnostics: C2143 at `obmalloc.c(2798)`; C2275/C2146/C2065 on `size_t nbytes` at `(2799)`, then C2143 late-declaration diagnostics at `(2800-2802)`. Capture: `build/cron-current/cron-20261008-realloc-reprobe.log`.
- One focused coding-agent delegation was attempted for the confirmed blocker. It failed before startup with `The 'anthropic' package is required ... venv: not installed and lazy installs are disabled: ['anthropic']`. No child edits were applied.
- CPython baseline checks: `git -C cpython describe --tags --exact-match HEAD` → `v3.11.16`; `git -C cpython rev-parse HEAD` → `41388c9cb160d0886d5ca00d2e6c8782608a4549`. Scoped `git diff --check` and `git -C cpython diff --check -- Objects/obmalloc.c` exited 0 before the status update.

Files changed by this run: `PORT_STATUS.md` only. The worktree's pre-existing modifications and untracked tests remain preserved. This is compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next: retry one focused TDD coding lane for the confirmed `obmalloc.c(2798)` function, first identify its exact declaration family and a focused regression safely; do not broaden edits or claim port completion.

---

## Latest run (`_PyMem_DebugRawRealloc` C89 locals hoisted; frontier advances)

Date: 2026-10-08 05:45 UTC

Read `PORT_STATUS.md`, `README.md`, and the CPython Win9x/MSVC6 reference before acting. Preserved all pre-existing outer and detached CPython work; no reset, clean, stash, discard, commit, push, publication, or patch regeneration. Baseline remains CPython `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded `_PyMem_DebugRawFree()` follow-on was re-probed forced-fresh before editing; its previous entry-declaration fix remains. The probe confirms `_blake2/blake2s_impl.c` compiled and the first stable blocker moved to `_PyMem_DebugRawRealloc()` at `obmalloc.c(2650-2658)`: C2275/C2065 for late `debug_alloc_api_t *api`, followed by the distinct late `uint8_t` pointer, `size_t`, and `save` declarations. One focused Hermes coding-agent delegation failed before startup because the `anthropic` package is unavailable and lazy installs are disabled. One focused Codex CLI lane (`codex-cli 0.153.4`, OpenAI provider, workspace-write, ephemeral; session `01a11a06-0784-7842-8da5-c5896b6ee1a6`) followed strict TDD. It added `scripts/vc6-obmalloc-debugrawrealloc-c89.test.py`, observed the expected RED assertion before production edits, then hoisted only `_PyMem_DebugRawRealloc()` locals (including guarded `block_serialno`) to the function entry. `api` remains initialized after the NULL return; `block_serialno` retains its read after the overflow guard and tail calculation. Existing operation/control-flow order and both preprocessor paths are asserted by the test. No neighboring function was modified.

Exact verification:

- Pre-change forced-fresh command: `XDG_RUNTIME_DIR="$PWD/build/cron-current/runtime-cron-20261008-blake2" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-current/cron-20261008-blake2-reprobe.log 2>&1` — actual probe exit 2; summary `total=101 compiled=100 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First stable diagnostics are C2275/C2065 at `obmalloc.c(2650)` on `debug_alloc_api_t` / `api`, then C2275/C2065 at lines 2651-2658 for subsequent locals. Capture: `build/cron-current/cron-20261008-blake2-reprobe.log`.
- TDD RED: `python3 scripts/vc6-obmalloc-debugrawrealloc-c89.test.py cpython/Objects/obmalloc.c` — exit 1 before source edit with expected assertion that all locals, including `block_serialno`, must be entry declarations.
- Focused GREEN and applicable obmalloc regressions: `scripts/vc6-obmalloc-debugrawrealloc-c89.test.py` plus every existing `scripts/vc6-obmalloc-*.test.py` script — all 14 scripts exit 0. Tracemalloc test was given `cpython/Include/internal/pycore_pymem.h`. Individual reruns confirmed each result. An attempted combined shell-loop invocation was blocked by the cron security scanner before execution; it is not counted as test failure or pass evidence.
- Post-change forced-fresh probe with runtime `build/cron-current/runtime-cron-20261008-blake2-post` and same flags — actual probe exit 2; summary `total=101 compiled=100 cached=0 skipped=0`. The previous diagnostics at 2650-2658 are gone; the first remaining stable diagnostics advance to `obmalloc.c(2798-2805)` in a later function. Capture: `build/cron-current/cron-20261008-blake2-post.log`.
- `git diff --check`, `git -C cpython diff --check`, exact tag/commit checks — exit 0; baseline unchanged. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified.

Files changed by this run: `cpython/Objects/obmalloc.c`, new `scripts/vc6-obmalloc-debugrawrealloc-c89.test.py`, and this status entry. This is compiler-probe progress only. Next: fresh forced-fresh probe before edits; if confirmed, inspect only the first `obmalloc.c(2798)` declaration blocker. Preserve all existing work and do not claim port completion.

---

## Previous latest run (`_PyMem_DebugRawFree` C89 locals hoisted; frontier advances)

Date: 2026-10-08 UTC

Read `PORT_STATUS.md`, `README.md`, and the CPython Win9x/MSVC6 reference before acting. Preserved the existing dirty outer and detached CPython work; no reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. CPython remains at exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

A fresh forced-fresh VC6/Wine probe showed the logged `insert_to_freepool()` frontier was stale: `_blake2/blake2s_impl.c` compiled and the first stable diagnostics were C2275/C2065 at `Objects/obmalloc.c(2628-2630)`, late declarations inside `_PyMem_DebugRawFree()` following its NULL early return. One focused Codex CLI lane (`codex-cli 0.153.4`, OpenAI provider, workspace-write, ephemeral; session `01a1198d-bd77-7c01-95e3-788ab2904294`) performed strict TDD. It added `scripts/vc6-obmalloc-debugrawfree-c89.test.py`, observed expected RED before production edits, then hoisted only `debug_alloc_api_t *api`, `uint8_t *q`, and `size_t nbytes` to function entry. Assignments to `api` and `q` remain after the `p == NULL` return, retaining the original evaluation point and NULL safety. The test checks declarations, the guard, assignment positions, and full operation order. `_PyMem_DebugRawRealloc()` and every other compiler blocker remain untouched.

Exact verification:

- Pre-change forced-fresh command: `XDG_RUNTIME_DIR="$PWD/build/cron-current/runtime-cron-20261008" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-current/cron-20261008-reprobe.log 2>&1` — actual probe exit 2; `total=101 compiled=100 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First stable errors: C2275 `debug_alloc_api_t` and C2065 `api` at line 2628, then C2275 `uint8_t`/C2065 `q` at 2629 and C2143 before `size_t nbytes` at 2630. Capture: `build/cron-current/cron-20261008-reprobe.log`.
- TDD RED: `python3 scripts/vc6-obmalloc-debugrawfree-c89.test.py cpython/Objects/obmalloc.c` — exit 1 before source edit, expected entry-declaration assertion.
- GREEN and applicable regressions: `python3 scripts/vc6-obmalloc-debugrawfree-c89.test.py cpython/Objects/obmalloc.c && for test in scripts/vc6-obmalloc-*.test.py; do python3 "$test" cpython/Objects/obmalloc.c cpython/Include/internal/pycore_pymem.h || exit "$?"; done` — exit 0; focused test and all 13 obmalloc scripts passed.
- Post-change forced-fresh probe with runtime `build/cron-current/runtime-cron-20261008-post`, same flags — actual probe exit 2; `total=101 compiled=100 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. Former diagnostics at lines 2628-2630 are gone; first stable blocker advances to `_PyMem_DebugRawRealloc()` at `obmalloc.c(2650-2655)`, C2275/C2065 for late `api`, `head`, `data`, `r`, `tail`, and `total` declarations. Capture: `build/cron-current/cron-20261008-post.log`.
- `git -C cpython describe --tags --exact-match HEAD` → `v3.11.16`; `git -C cpython rev-parse HEAD` → `41388c9cb160d0886d5ca00d2e6c8782608a4549`. `git diff --check` and `git -C cpython diff --check -- Objects/obmalloc.c` exited 0. Baseline-hash check confirmed the 4,767 other tracked/untracked files and indexes were unchanged by the coding lane; CPython source bytes outside `_PyMem_DebugRawFree()` were unchanged.

Files changed by this slice: `cpython/Objects/obmalloc.c`, new `scripts/vc6-obmalloc-debugrawfree-c89.test.py`, and this status entry. Compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next: fresh forced-fresh probe before edits; if confirmed, address only the first `_PyMem_DebugRawRealloc()` declaration family, with its own TDD slice. Do not claim port completion.

---

## Previous latest run (`insert_to_freepool` C89 locals hoisted; frontier advances)

Date: 2026-10-07 UTC

Read `PORT_STATUS.md`, `README.md`, and the CPython Win9x/MSVC6 reference before acting. Preserved all pre-existing outer and detached CPython work; no reset, clean, stash, discard, commit, push, publication, or patch regeneration. CPython remains at exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

Re-probed the recorded `insert_to_freepool()` frontier with forced-fresh VC6/Wine compilation before editing. `_blake2/blake2s_impl.c` compiled; the first stable diagnostic was C2143 at `obmalloc.c(2109)` for a declaration after executable statements, followed by undeclared `ao` at 2110 and more late declarations (`nf`, `lastnf`). Used one focused Codex CLI lane (`codex-cli 0.153.4`, OpenAI provider, workspace-write, ephemeral; session `01a11829-db82-70c1-87da-d70916c05d82`) for strict TDD. Added `scripts/vc6-obmalloc-insert-to-freepool-c89.test.py`; its RED run failed with the expected assertion requiring entry declarations. Then hoisted only six locals (`next`, `prev`, `ao`, `nf`, `lastnf`, `p`) to function entry; all initialized values remain assigned at their original evaluation points, including `p` inside its branch. Assertions, branch/control flow, and pointer update order are retained. No neighboring function was edited.

Exact verification:

- Pre-change forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/cron-current/runtime-rerun" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-current/cron-insert-freepool-reprobe.log 2>&1` — probe exit 2; `total=101 compiled=100 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First diagnostics: C2143 at `obmalloc.c(2109)`, C2065 `ao` at `(2110)`, then C2143 at `(2112)` and `(2117)`. Log: `build/cron-current/cron-insert-freepool-reprobe.log`.
- TDD RED: `python3 scripts/vc6-obmalloc-insert-to-freepool-c89.test.py cpython/Objects/obmalloc.c` — exit 1 before production edit; expected assertion `insert_to_freepool must declare all six locals without initializers at function entry`.
- TDD GREEN and all 11 `scripts/vc6-obmalloc-*.test.py` regressions — exit 0. This included insert-to-freepool, insert-to-usedpool, pool-extend/allocator, calloc, arena-map, allocator-name/default-allocator, RawWcsdup, setup-allocators, and tracemalloc initializer checks. Tracemalloc invocation included `cpython/Include/internal/pycore_pymem.h`.
- Post-change forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/cron-current/runtime-post-insert-freepool" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-current/post-insert-to-freepool.log 2>&1` — probe exit 2; `total=101 compiled=100 cached=0 skipped=0`. The former diagnostics at lines 2109-2117 are gone. First remaining diagnostic is C2143 at `obmalloc.c(2286)` in the next function, `pymalloc_free()`; its late local declaration is untouched. Log: `build/cron-current/post-insert-to-freepool.log`.
- `git -C cpython diff --check -- Objects/obmalloc.c` and `git diff --check -- scripts/vc6-obmalloc-insert-to-freepool-c89.test.py` — exit 0. Nested baseline tag/commit unchanged.

Files changed by this slice: `cpython/Objects/obmalloc.c`, new `scripts/vc6-obmalloc-insert-to-freepool-c89.test.py`, and this status entry. Compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next: fresh forced-fresh probe before any edits; if confirmed, handle only the first `pymalloc_free()` declaration family at line 2286 with a separate TDD slice. Do not claim port completion.

---

## Latest run (`insert_to_usedpool` C89 locals hoisted; frontier advances)

Date: 2026-10-07 18:52 UTC

Read this status, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved all pre-existing outer and detached CPython work; no reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. CPython remains at exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

Re-probed the prior `_PyObject_Calloc()`/`insert_to_usedpool()` state with a forced-fresh MSVC600/Wine source-list probe. `_blake2/blake2s_impl.c` compiled; `_PyObject_Calloc()` diagnostics were gone and the first stable blocker was `insert_to_usedpool()`'s late declarations at `obmalloc.c(2083-2085)`. Used one focused Codex CLI lane (`codex-cli 0.153.4`, OpenAI provider, workspace-write, ephemeral; session `01a117af-724f-72c0-bb0a-17cc39fe3fb2`) for strict TDD. The lane added `scripts/vc6-obmalloc-insert-to-usedpool-c89.test.py`, observed expected RED before changing production source, then hoisted only `uint size`, `poolp next`, and `poolp prev` to function entry and changed their initializers to assignments after the original assertion. The size calculation, lookup order, and four pointer-link writes are preserved. No neighboring function or later blocker was changed. The coding lane initially passed the wrong header to the broad obmalloc test loop; that invocation failed at tracemalloc header discovery. It corrected the header and the complete applicable obmalloc test set passed.

Exact verification:

- Before-change forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/cron-current/runtime-cron-calloc-reprobe" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-current/cron-calloc-reprobe.log 2>&1` — actual probe exit 2; `total=101 compiled=100 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First stable diagnostics were C2143 at `obmalloc.c(2083)`, followed by C2275/C2146/C2065 for `poolp next` and `poolp prev` at `(2084-2085)`. Log: `build/cron-current/cron-calloc-reprobe.log`.
- TDD RED: `python3 scripts/vc6-obmalloc-insert-to-usedpool-c89.test.py cpython/Objects/obmalloc.c` — exit 1 before source edit with expected assertion that `size`, `next`, and `prev` must be declared without initializers at function entry.
- TDD GREEN: same command after source edit — exit 0; `obmalloc insert_to_usedpool entry declarations and original operation order: PASS`.
- Applicable obmalloc regressions (new insert-to-usedpool test plus all existing `vc6-obmalloc-*.test.py` tests) — exit 0. The exact corrected chained command is recorded in the Codex output `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1791398735-1124658-4e90.log`; every script passed, including the tracemalloc test with `cpython/Include/internal/pycore_pymem.h`. Independently reran the complete applicable set: all 10 `scripts/vc6-obmalloc-*.test.py` scripts passed (exit 0).
- Post-change forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/cron-current/runtime-post-usedpool" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-current/post-insert-to-usedpool.log 2>&1` — actual probe exit 2; `total=101 compiled=100 cached=0 skipped=0`. The former `insert_to_usedpool()` diagnostics at `(2083-2085)` are gone. First remaining errors are in the next function `insert_to_freepool()`, beginning C2143 at `(2109)` and C2065 `ao` at `(2110)`; left untouched. `_blake2/blake2s_impl.c` compiled. Log: `build/cron-current/post-insert-to-usedpool.log`.
- Broader frontier regression harness: `bash scripts/vc6-probe-pythoncore-frontier.test.sh > build/cron-current/insert-to-usedpool-regression-suite.log 2>&1` — exit 1. It reports `_thread` and tracemalloc checks passed but retains the known `ValueError: substring not found` failure; no harness-wide pass claimed.
- `git diff --check -- PORT_STATUS.md scripts/vc6-obmalloc-insert-to-usedpool-c89.test.py` and `git -C cpython diff --check -- Objects/obmalloc.c` — exit 0. CPython exact tag/commit unchanged.

Files changed by this slice: `cpython/Objects/obmalloc.c`, new `scripts/vc6-obmalloc-insert-to-usedpool-c89.test.py`, and this status entry. This is compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next: perform a fresh forced-fresh probe before edits; if confirmed, address only the first `insert_to_freepool()` declaration family at line 2109 with a separate TDD slice. Do not claim port completion.

---

## Latest run (`pymalloc_alloc` locals hoisted for VC6; frontier advances)

Date: 2026-10-07 14:25 UTC

Read `PORT_STATUS.md`, `README.md`, and the CPython Win9x/MSVC6 reference before acting. Preserved all existing outer and detached CPython work; no reset, clean, stash, discard, commit, push, publication, or patch regeneration. CPython remains at exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded `allocate_from_new_pool()` frontier was re-probed before edits. Forced-fresh VC6/Wine compilation confirmed `_blake2/blake2s_impl.c` compiled; the prior diagnostics at `obmalloc.c(2007-2009)` were stale and the actual first diagnostic group was late declarations in the subsequent `_PyObject_Calloc()` / `insert_to_usedpool()` code. Used one focused Codex CLI lane (`codex-cli 0.153.4`, OpenAI provider, workspace-write, ephemeral; session `01a116bb-a28a-72e1-aa0e-2e149d4d582f`). It extended the existing pool-extend regression with a `pymalloc_alloc()` declaration/order assertion, observed expected RED before source edits, then hoisted only `uint size`, `poolp pool`, and `block *bp` to the function entry. Their initializations and all existing early-return, pool-read, and branch evaluation/control-flow order remain unchanged. No subsequent declarations or distinct functions were edited.

Exact verification:

- Pre-change forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/cron-current/runtime-reprobe" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-current/cron-reprobe-latest.log 2>&1` — probe exit 2; `total=101 compiled=100 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First diagnostic C2143 at `obmalloc.c(2007)`, followed by C2275/C2146/C2065 at lines 2008-2009. The capture also included later cascades.
- TDD RED: `python3 scripts/vc6-obmalloc-pool-extend-c89.test.py cpython/Objects/obmalloc.c` — exit 1; expected assertion `pymalloc_alloc must declare size, pool, and bp without initializers at function entry`; preceding checks for `pymalloc_pool_extend` and `allocate_from_new_pool` passed.
- TDD GREEN: same focused command — exit 0; all three pool/allocator declaration-order checks passed. Seven other obmalloc regression scripts (allocator-name, arena-map-is-used, arena-map-mark-used, default allocator, RawWcsdup/allocated-blocks, setup-allocators, tracemalloc-init) each exited 0; tracemalloc used `cpython/Include/internal/pycore_pymem.h`. Codex lane's per-command output is in `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1791382756-1050053-2fd0.log`.
- Applicable regression harness `bash scripts/vc6-probe-pythoncore-frontier.test.sh > /tmp/pymalloc-alloc-frontier.log 2>&1` — exit 1. Known unrelated console type-detection/order assertion failed; numeric-dispatch check raised `ValueError: substring not found`. Many other checks passed; no broad-suite pass claimed.
- Post-change forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/cron-current/runtime-post-pymalloc" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-current/post-pymalloc-alloc.log 2>&1` — probe exit 2; `total=101 compiled=100 cached=0 skipped=0`. No diagnostics remain at `obmalloc.c(2007-2009)`. First remaining errors are C2143 at lines 2059 and 2061, followed by C2065 `ptr` / `nbytes` at lines 2062-2063 in `_PyObject_Calloc()`; subsequent C89 diagnostics at line 2080 onward are separate and untouched. This is compiler-probe progress only.
- `git diff --check` and `git -C cpython diff --check -- Objects/obmalloc.c` — exit 0. Nested baseline verified: exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

Files changed by this slice: `cpython/Objects/obmalloc.c`, extended `scripts/vc6-obmalloc-pool-extend-c89.test.py`, and this status entry. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next: freshly probe before edits; if confirmed, handle only the first current blocker in `_PyObject_Calloc()` at lines 2059-2063 with its own TDD slice. Do not claim a completed port.

---

## Latest run (`allocate_from_new_pool` pool declaration hoisted; frontier advances)

Date: 2026-10-07 09:56 UTC

Read `PORT_STATUS.md`, `README.md`, and the CPython Win9x/MSVC6 reference before acting. Preserved all existing outer and detached CPython work; no reset, clean, stash, discard, commit, push, publication, or patch regeneration. CPython remains at exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

Re-probed the recorded `poolp next` frontier before editing. It had already been fixed locally: the current first blocker was the separate late initialized `poolp pool = usable_arenas->freepools` declaration in `allocate_from_new_pool()`. Used one focused Codex CLI lane (`codex-cli 0.153.4`, OpenAI provider, workspace-write, ephemeral; session `01a115c5-019c-76d0-ba38-5934bc3d03d6`) after native delegation failed because the Anthropic package is unavailable and lazy installs are disabled. The lane extended the existing pool-extend test, ran the focused test RED before production edit, then hoisted only `poolp pool` to function entry. The assignment remains after the arena-list updates at its original execution point. Existing early returns, allocator list operations, and subsequent pool initialization remain unchanged. `pymalloc_pool_extend()` and the distinct subsequent blockers were not altered.

Exact verification:

- Pre-change forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/cron-current/runtime-confirm" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — probe exit 2; `total=101 compiled=100 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First stable diagnostics: C2275/C2146/C2065 at `obmalloc.c(1889)` on `poolp pool`; following pointer errors are cascades. Log: `build/cron-current/cron-reprobe-current.log`.
- TDD RED: `python3 scripts/vc6-obmalloc-pool-extend-c89.test.py cpython/Objects/obmalloc.c` — exit 1; expected assertion that `allocate_from_new_pool` must declare `pool` without an initializer at function entry. The prior `pymalloc_pool_extend` assertion passed.
- Focused GREEN and eight applicable obmalloc tests: `python3 scripts/vc6-obmalloc-pool-extend-c89.test.py cpython/Objects/obmalloc.c && python3 scripts/vc6-obmalloc-arena-map-mark-used-c89.test.py cpython/Objects/obmalloc.c && python3 scripts/vc6-obmalloc-arena-map-is-used-c89.test.py cpython/Objects/obmalloc.c && python3 scripts/vc6-obmalloc-allocator-name-c89.test.py cpython/Objects/obmalloc.c && python3 scripts/vc6-obmalloc-default-allocator-c89.test.py cpython/Objects/obmalloc.c && python3 scripts/vc6-obmalloc-rawwcsdup-c89.test.py cpython/Objects/obmalloc.c && python3 scripts/vc6-obmalloc-setup-allocators-c89.test.py cpython/Objects/obmalloc.c && python3 scripts/vc6-obmalloc-tracemalloc-init-c89.test.py cpython/Objects/obmalloc.c cpython/Include/internal/pycore_pymem.h` — exit 0; all checks passed. The RawWcsdup test includes C89 compile/runtime checks.
- Applicable regression harness: `bash scripts/vc6-probe-pythoncore-frontier.test.sh` — exit 1; existing console type-detection/cleanup-order assertion and numeric-dispatch `ValueError: substring not found` remain. No harness-wide pass claimed.
- Post-change forced-fresh probe (same options, runtime `build/cron-current/runtime-post`) — probe exit 2; `total=101 compiled=100 cached=0 skipped=0`; the former `poolp pool` diagnostics are gone. First remaining diagnostics now occur later in `obmalloc.c` at lines 1947-1952 (`block bp`, then `poolp next` in a separate function); further C89 declaration/type blockers follow. Log: `build/cron-current/post-pool-entry.log`.
- `git diff --check` and `git -C cpython diff --check -- Objects/obmalloc.c` — exit 0. Exact baseline tag/commit remain unchanged.

Files changed by this slice: `cpython/Objects/obmalloc.c`, extended `scripts/vc6-obmalloc-pool-extend-c89.test.py`, and this status entry. Compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next: freshly probe before edits and address only the first current blocker in the next function in `obmalloc.c` (currently `block *bp` at line 1947), with its own TDD slice. Do not claim port completion.

---

## Previous latest run (`pymalloc_pool_extend` next declaration hoisted; frontier advances)

Date: 2026-10-07 07:34 UTC

Read `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved all existing outer and detached CPython changes; no reset, clean, stash, discard, commit, push, publication, or broad patch regeneration. CPython remains at exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded `poolp next` frontier was confirmed by a fresh forced-fresh MSVC600/Wine probe: `total=101 compiled=100 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First errors were C2275/C2146/C2065 at `obmalloc.c(1838)` for late `poolp next`, then pointer-type cascades. Hermes coding-subagent dispatch failed before startup because the `anthropic` package is unavailable and lazy installs are disabled. Used one focused Codex CLI lane (`codex-cli 0.153.4`, OpenAI provider, workspace-write, ephemeral; session `01a11547-34ae-7a62-b889-a4ff244cc66a`) following strict TDD. It added `scripts/vc6-obmalloc-pool-extend-c89.test.py`, observed expected RED before modifying production source, then hoisted only `poolp next` to function entry. Its assignment remains at the original point after the full-pool branch. No behavior or evaluation order changed; the distinct later `poolp pool` blocker was not touched.

Exact verification:

- Pre-change forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/cron-current/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2; `total=101 compiled=100 cached=0 skipped=0`. First errors C2275/C2146/C2065 at `obmalloc.c(1838)` for `poolp next`. Log: `build/cron-current/cron-reprobe.log`.
- TDD RED: `python3 scripts/vc6-obmalloc-pool-extend-c89.test.py cpython/Objects/obmalloc.c` — exit 1, expected assertion that `next` must be declared at function entry.
- Focused GREEN/regressions: `for test in scripts/vc6-obmalloc-*.test.py; do python3 "$test" cpython/Objects/obmalloc.c cpython/Include/internal/pycore_pymem.h || exit "$?"; done` — exit 0; all eight obmalloc tests passed, including pool-extend declaration/order, allocator and arena-map tests, RawWcsdup C89 compile/runtime checks, setup allocators, and tracemalloc initializer.
- First post-change forced-fresh attempt — exit 1 before compiler startup; Wine server failed to create a lock under read-only `/run/user/1000`. This is not compiler evidence. Retried with `XDG_RUNTIME_DIR="$PWD/build/cron-current/runtime-retry"` and the same command — exit 2; `total=101 compiled=100 cached=0 skipped=0`. `_blake2/blake2s_impl.c` and `obmalloc.c` compiled through the changed function. Former line-1838 diagnostics are gone. First remaining blocker is the separate late `poolp pool` at `obmalloc.c(1889)` (C2275/C2146/C2065); following `->` errors cascade. Log: `build/cron-current/post-pool-next.log`.
- `git -C cpython describe --tags --exact-match HEAD` / `rev-parse HEAD` verified unchanged baseline. Codex preservation snapshot found only the intended pre-existing modified `cpython/Objects/obmalloc.c` plus the new test; the production diff is only the declaration move. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified.

Files changed by this slice: `cpython/Objects/obmalloc.c`, new `scripts/vc6-obmalloc-pool-extend-c89.test.py`, and this status entry. Compiler-probe progress only. Next: fresh forced probe before any further change; if confirmed, address only the separate `poolp pool` declaration at line 1889 using TDD. Do not claim port completion.

---

## Previous latest run (`arena_map_is_used` C89 locals hoisted; frontier advances)

Date: 2026-10-07 03:21 UTC

Read `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved the pre-existing outer and detached CPython changes; no reset, clean, stash, discard, commit, push, publication, or patch regeneration. CPython remains at exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

Fresh forced-fresh probe confirmed the prior arena-map frontier had advanced: `_blake2/blake2s_impl.c` compiled and the first stable errors were the late `i3`, `hi`, `lo`, and `tail` declarations inside `arena_map_is_used()` (`obmalloc.c(1592,1594-1596)`). The Anthropic coding subagent failed before startup because the `anthropic` package is missing and lazy installs are disabled. Used one focused Codex CLI lane (`codex-cli 0.153.4`, OpenAI provider, workspace-write, ephemeral; session `01a1145b-a4bc-7c90-8b48-2d26ea8bc7f9`) for strict TDD. It added `scripts/vc6-obmalloc-arena-map-is-used-c89.test.py`, observed expected RED before production edits, then hoisted only `int i3` and `int32_t hi`, `lo`, `tail` above the NULL guard. Their assignments remain after the successful lookup / NULL return at their original evaluation points. The lookup, null behavior, assignment order, and short-circuit predicate remain unchanged. Hash preservation check after the coding lane confirmed the other 134 pre-existing dirty/untracked files (including `PORT_STATUS.md` at that point) and source outside this function were byte-identical; this status entry was updated afterward for the current run.

Exact verification:

- Before-change forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/cron-current/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — actual exit 2; `total=101 compiled=100 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First diagnostic C2143 at `obmalloc.c(1592)`, followed by C2275/C2146/C2065 on `int32_t hi`, `lo`, and `tail` at lines 1594-1596. Log: `build/cron-current/cron-reprobe.log`.
- TDD RED before source edit: `python3 scripts/vc6-obmalloc-arena-map-is-used-c89.test.py cpython/Objects/obmalloc.c` — exit 1, expected assertion that the function must declare its locals before the NULL guard.
- Focused regressions, independently rerun after edit: new arena-map-is-used test, arena-map-mark-used, allocator-name, default-allocator, RawWcsdup/allocated-blocks, setup-allocators, and tracemalloc-init tests — all exit 0. Exact chained command: `python3 scripts/vc6-obmalloc-arena-map-is-used-c89.test.py cpython/Objects/obmalloc.c && python3 scripts/vc6-obmalloc-arena-map-mark-used-c89.test.py cpython/Objects/obmalloc.c && python3 scripts/vc6-obmalloc-allocator-name-c89.test.py cpython/Objects/obmalloc.c && python3 scripts/vc6-obmalloc-default-allocator-c89.test.py cpython/Objects/obmalloc.c && python3 scripts/vc6-obmalloc-rawwcsdup-c89.test.py cpython/Objects/obmalloc.c && python3 scripts/vc6-obmalloc-setup-allocators-c89.test.py cpython/Objects/obmalloc.c && python3 scripts/vc6-obmalloc-tracemalloc-init-c89.test.py cpython/Objects/obmalloc.c cpython/Include/internal/pycore_pymem.h`.
- Applicable harness: `bash scripts/vc6-probe-pythoncore-frontier.test.sh > build/cron-current/arena-map-is-used-regression-suite.log 2>&1` — exit 1. It reports the known console type-detection/order failure and numeric-dispatch `ValueError: substring not found`; no broad suite pass claimed.
- Post-change forced-fresh probe, same command as before-change: actual exit 2; `total=101 compiled=100 cached=0 skipped=0`. The `arena_map_is_used()` diagnostics are gone. First remaining errors are C2275/C2146/C2065 at `obmalloc.c(1838)` for a late `poolp next`, with a separate late `poolp pool` family at line 1888; left untouched. Log: `build/cron-current/post-arena-map-is-used.log`.
- `git -C cpython diff --check -- Objects/obmalloc.c`, `git diff --check -- PORT_STATUS.md scripts/vc6-obmalloc-arena-map-is-used-c89.test.py`, and CPython tag/commit checks — exit 0. No standalone compiler banner was recorded.

Files changed by this slice: `cpython/Objects/obmalloc.c`, new `scripts/vc6-obmalloc-arena-map-is-used-c89.test.py`, and this status entry. Compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution. Next: fresh forced-fresh probe before further changes; if the frontier remains, address only the first `poolp next` C89 declaration family at line 1838 using TDD. Do not claim port completion.

---

## Previous run (`arena_map_mark_used` i3_next declaration hoisted; frontier advances)

Date: 2026-10-07 01:09 UTC

Read `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved all pre-existing outer and detached CPython changes; no reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. CPython remains exactly at release tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

A fresh forced-fresh MSVC600/Wine probe confirmed the recorded `i3_next` blocker in `arena_map_mark_used()`. The Hermes coding-subagent API failed before startup because the Anthropic package is missing and lazy installs are disabled. Used one focused Codex CLI `codex exec` lane instead (`codex-cli 0.153.4`, OpenAI provider, workspace-write, ephemeral; session `01a113e3-575e-7512-89ed-0378245bfdd7`). It extended only the existing arena-map test, observed expected RED before production changes, then hoisted only `int i3_next` to function entry and changed its late initialized declaration to assignment at the original point after the `n_lo == NULL` return. Its expression, evaluation point, lookup and rollback/control flow remain unchanged. Other local changes were preserved.

Exact verification:

- Pre-change: `XDG_RUNTIME_DIR="$PWD/build/cron-current/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — actual probe exit 2; `total=101 compiled=100 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First stable diagnostics C2143 at `obmalloc.c(1576)` and C2065 `i3_next` at `(1577)`. Capture: `build/cron-current/cron-reprobe.log`.
- TDD RED: `python3 scripts/vc6-obmalloc-arena-map-mark-used-c89.test.py cpython/Objects/obmalloc.c` — exit 1, expected assertion that `i3_next` must be declared at function entry without initializer.
- Focused regressions: `python3 scripts/vc6-obmalloc-arena-map-mark-used-c89.test.py cpython/Objects/obmalloc.c && python3 scripts/vc6-obmalloc-allocator-name-c89.test.py cpython/Objects/obmalloc.c && python3 scripts/vc6-obmalloc-default-allocator-c89.test.py cpython/Objects/obmalloc.c && python3 scripts/vc6-obmalloc-rawwcsdup-c89.test.py cpython/Objects/obmalloc.c && python3 scripts/vc6-obmalloc-setup-allocators-c89.test.py cpython/Objects/obmalloc.c && python3 scripts/vc6-obmalloc-tracemalloc-init-c89.test.py cpython/Objects/obmalloc.c cpython/Include/internal/pycore_pymem.h` — exit 0; all six pass. RawWcsdup includes C89 compile/runtime checks.
- Applicable harness: `bash scripts/vc6-probe-pythoncore-frontier.test.sh > build/cron-current/i3-next-regression-suite.log 2>&1` — exit 1. Many checks pass; the known numeric-dispatch check raises `ValueError: substring not found`. No full-suite pass claimed.
- Post-change forced-fresh probe (same command, captured in `build/cron-current/post-i3-next.log`) — actual probe exit 2; `total=101 compiled=100 cached=0 skipped=0`. The former `i3_next` diagnostics are gone. First remaining blocker is `arena_map_is_used()` at line 1592 (C2143 on late `int i3`); subsequent C89/type diagnostics at 1594-1596 and pool diagnostics at 1833 onward are separate and untouched. The compile probe still does not link an interpreter.
- `git -C cpython describe --tags --exact-match HEAD` and `git -C cpython rev-parse HEAD` confirm baseline unchanged. Scoped `git diff --check` commands for the production and test files exited 0.

Files changed by this slice: `cpython/Objects/obmalloc.c`, `scripts/vc6-obmalloc-arena-map-mark-used-c89.test.py`, and this status entry. Compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution. Next: fresh forced probe before further edits; if the frontier remains current, handle only the first `arena_map_is_used()` C89 declaration family using TDD. Do not claim port completion.

---

## Previous run (fresh VC6 frontier probe; implementation lane unavailable)

Date: 2026-10-06 22:57 UTC

Read `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md`. Preserved all existing outer and detached CPython work; no reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. CPython remains exactly at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`. The recorded `n_lo` frontier is no longer the first blocker: a fresh forced-fresh VC6/Wine probe confirms `i3_next` at `Objects/obmalloc.c(1576-1577)` is now first.

One focused Hermes coding-subagent attempt was made as required, but failed before startup: the Anthropic package is missing and lazy installs are disabled. No implementation or test change was made; this run is diagnostic-only rather than attempting an unreviewed direct edit.

Exact verification:

- `XDG_RUNTIME_DIR="$PWD/build/cron-current/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-current/cron-reprobe.log 2>&1; rc=$?; ...` — probe exit 2 (`total=101 compiled=100 cached=0 skipped=0`). `_blake2/blake2s_impl.c` compiled. First stable diagnostics: C2143 at `obmalloc.c(1576)` and C2065 `i3_next` at `(1577)`. Subsequent independent failures include declarations in `arena_map_is_used()` at 1591-1595 and pool-related errors at 1832 onward; left untouched. Full capture: `build/cron-current/cron-reprobe.log`.
- The terminal wrapper returned exit 0 because it printed and retained the actual probe return code (`PROBE_EXIT=2`); no compilation success is implied.
- Baseline verification: `git -C cpython describe --tags --exact-match HEAD` → `v3.11.16`; `git -C cpython rev-parse HEAD` → `41388c9cb160d0886d5ca00d2e6c8782608a4549`.
- Existing focused regression suite was not run because this diagnostics-only run changed no source/tests. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified.

Files changed this run: `PORT_STATUS.md` only. Next: use a focused coding lane when delegation is available to TDD only the `i3_next` declaration in `arena_map_mark_used()`, preserving its initialization/evaluation point; keep `arena_map_is_used()` and later pool blockers separate. Do not claim port completion.

---

## Latest run (`arena_map_mark_used` n_lo declaration hoisted; frontier advances)

Date: 2026-10-06 20:52 UTC

Read `PORT_STATUS.md`, `README.md`, and the active-profile CPython Win9x/MSVC6 reference before acting. Preserved the existing dirty outer and detached CPython changes; no reset, clean, stash, discard, commit, push, or patch regeneration. CPython remains at release tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded `n_lo` frontier was freshly confirmed with a forced-fresh MSVC600/Wine source-list probe. `_blake2/blake2s_impl.c` compiled; the first blocker was C2275/C2065 at `Objects/obmalloc.c(1569)` on the late `arena_map_bot_t *n_lo`. Hermes coding-subagent dispatch could not start because the Anthropic package is missing and lazy installs are disabled. A focused Codex CLI lane (`codex-cli 0.153.4`, workspace-write, ephemeral; session `01a112f7-89f4-7122-9f20-3c7d6c856113`) performed strict TDD. It extended only the existing arena-map test, observed expected RED before the source edit, then hoisted only `n_lo` to the function's declarations and changed its former initialized declaration to assignment at the original point after the overflow assertion. Existing null handling, rollback, and later `i3_next` declaration remain unchanged. The lane hash/inventory comparison confirmed every other pre-existing file remained byte-identical.

Exact verification:

- Pre-change forced-fresh command: `XDG_RUNTIME_DIR="$PWD/build/cron-current/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2; `total=101 compiled=100 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First stable diagnostics: C2275/C2065 at `obmalloc.c(1569)` for `arena_map_bot_t *n_lo`. Capture: `build/cron-current/cron-reprobe.log`.
- TDD RED: `python3 scripts/vc6-obmalloc-arena-map-mark-used-c89.test.py cpython/Objects/obmalloc.c` — exit 1 with expected assertion that `n_lo` must be declared without initializer at function entry. The test also locks assignment/evaluation and control-flow order.
- GREEN and focused obmalloc regressions: arena-map, allocator-name, default allocator, RawWcsdup/allocated-blocks, setup-allocators, and tracemalloc-init tests — all exit 0. Exact combined command: `python3 scripts/vc6-obmalloc-arena-map-mark-used-c89.test.py cpython/Objects/obmalloc.c && python3 scripts/vc6-obmalloc-allocator-name-c89.test.py cpython/Objects/obmalloc.c && python3 scripts/vc6-obmalloc-default-allocator-c89.test.py cpython/Objects/obmalloc.c && python3 scripts/vc6-obmalloc-rawwcsdup-c89.test.py cpython/Objects/obmalloc.c && python3 scripts/vc6-obmalloc-setup-allocators-c89.test.py cpython/Objects/obmalloc.c && python3 scripts/vc6-obmalloc-tracemalloc-init-c89.test.py cpython/Objects/obmalloc.c cpython/Include/internal/pycore_pymem.h`.
- Applicable regression harness: `bash scripts/vc6-probe-pythoncore-frontier.test.sh > build/cron-current/n-lo-regression-suite.log 2>&1` — exit 1. Many checks pass; the known unrelated numeric-dispatch check raises `ValueError: substring not found`. No suite-wide pass claimed. During the coding lane, an initial malformed batch invocation and a wrong header path also exited 1; the exact corrected combined command above passed all six scripts.
- Post-change forced-fresh probe (same command as pre-change) — exit 2; `total=101 compiled=100 cached=0 skipped=0`. The line-1569 `n_lo` diagnostics are gone. First remaining errors are C2143/C2065 at `obmalloc.c(1576-1577)` for the distinct late `i3_next` declaration; later errors at `arena_map_is_used()` and pool declarations are separate and untouched. Capture: `build/cron-current/post-n-lo.log`.
- `git -C cpython diff --check -- Objects/obmalloc.c` and `git diff --check -- scripts/vc6-obmalloc-arena-map-mark-used-c89.test.py` — exit 0. Nested HEAD/tag remain exact. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified.

Files changed by this slice: `cpython/Objects/obmalloc.c`, `scripts/vc6-obmalloc-arena-map-mark-used-c89.test.py`, and this status entry. This is compiler-probe progress only. Next: perform a fresh forced-fresh probe before edits; if the frontier remains, address only `i3_next` in `arena_map_mark_used()` as a separate TDD slice. No commit or push.

---

## Latest run (`arena_base_next` C89 declaration hoisted; frontier advances)

Date: 2026-10-06 18:34 UTC

Read `PORT_STATUS.md`, `README.md`, and the active-profile CPython Win9x/MSVC6 reference before acting. Preserved all pre-existing outer and detached CPython changes; no reset, clean, stash, discard, commit, push, compatibility patch regeneration, or publication. CPython baseline remains tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`.

The recorded next blocker after the prior `arena_map_mark_used()` declarations was freshly confirmed with a forced-fresh VC6/Wine source-list probe. `_blake2/blake2s_impl.c` compiled; first diagnostics were C2275/C2146/C2065 at `Objects/obmalloc.c(1562)` for late `uintptr_t arena_base_next`. The required Hermes coding-subagent attempt failed before startup because the Anthropic package is missing and lazy installs are disabled. A focused Codex CLI lane (`codex-cli 0.153.4`, workspace-write; session `01a1127d-d96c-7162-b2b7-43f5313f1b89`) followed TDD. It extended the existing arena-map test to require the entry declaration and preserve initialization at the original assignment point, observed expected RED before production edits, then hoisted only this declaration. `arena_map_mark_used()` control flow and all later declarations/functions remain unchanged.

Exact verification:

- Baseline and working-tree check: outer branch `main`; nested CPython exact tag/commit `v3.11.16` / `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Existing dirty and untracked state retained.
- Pre-change forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/cron-current/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2; `total=101 compiled=100 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First errors C2275/C2146/C2065 at `obmalloc.c(1562)` on `uintptr_t arena_base_next`. Capture: `build/cron-current/cron-reprobe.log`.
- TDD RED: `python3 scripts/vc6-obmalloc-arena-map-mark-used-c89.test.py cpython/Objects/obmalloc.c` — exit 1 after extending the test, expected assertion that `n_hi, i3, tail, arena_base_next` must be declared without initializers at entry. The unmodified existing test passed before extension.
- GREEN and focused obmalloc checks: arena-map, allocator-name, default allocator, RawWcsdup/allocated-blocks, setup-allocators, and tracemalloc-init scripts — all exit 0. The RawWcsdup test also compiled/exercised its C89 harness.
- Applicable harness: `bash scripts/vc6-probe-pythoncore-frontier.test.sh` — exit 1. Numeric-dispatch check still raises `ValueError: substring not found`; captured in `build/cron-current/arena-base-next-regression.log` (line 238). Other logged checks passed; no suite-wide pass claimed.
- Post-change forced-fresh probe (same command) — exit 2; `total=101 compiled=100 cached=0 skipped=0`. The line-1562 diagnostics are gone. The first remaining blocker is C2275/C2065 at `obmalloc.c(1569)` for the separate late `arena_map_bot_t *n_lo`; later `i3_next`, `arena_map_is_used()`, and pool declarations remain untouched. Capture: `build/cron-current/post-arena-base-next.log`.
- Scoped nested `git diff --check -- Objects/obmalloc.c` and outer `git diff --check -- scripts/vc6-obmalloc-arena-map-mark-used-c89.test.py` — exit 0. Exact CPython baseline unchanged.

Files changed by this slice: `cpython/Objects/obmalloc.c`, `scripts/vc6-obmalloc-arena-map-mark-used-c89.test.py`, and this status log. This is compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution. Next: fresh forced-fresh probe before edits; if the frontier remains, address only the separate late `arena_map_bot_t *n_lo` declaration in `arena_map_mark_used()` with its own TDD slice. No commit or push.

---

## Previous latest run (arena_map_mark_used C89 declarations hoisted; frontier advances)

Date: 2026-10-06 16:15 UTC

Read `PORT_STATUS.md`, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved all pre-existing outer and detached CPython changes; no reset, clean, stash, discard, commit, push, patch regeneration, or publication. CPython baseline remains tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`.

The recorded radix-tree frontier was freshly confirmed before editing using forced-fresh MSVC600 through Wine. `_blake2/blake2s_impl.c` compiled; the first stable blocker was the late `n_hi`, `i3`, and `tail` declarations inside `arena_map_mark_used()` in `Objects/obmalloc.c`. Hermes coding-subagent delegation failed before startup because the Anthropic package is missing and lazy installs are disabled. Used one focused Codex CLI lane (`codex-cli 0.153.4`, workspace-write; session `01a11203-e64a-7843-943c-0fa3d62a875e`) for strict TDD. It added a focused order/declaration regression, observed expected RED before production edits, then hoisted only those three declarations to function entry. Their initializations remain after the original assertion, null check, and index evaluation at their original execution points. No neighboring `arena_map_is_used()` or later declaration families were changed. The coding lane's preservation check reported all 134 pre-existing changed/untracked files unchanged except for the intended source slice; it made no status-log edit.

Exact verification:

- Baseline check: outer branch `main` at `35caf1a558e6b2c5bf501894d8972f8b0dd828a6`; nested CPython exact tag/commit verified as `v3.11.16` / `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Initial outer dirty state preserved.
- Pre-change forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/cron-current/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2; `total=101 compiled=100 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First diagnostics C2143 at `obmalloc.c(1539)`, followed by C2143 at `(1544)` and C2275/C2146 for `int32_t tail` at `(1545)`. Capture: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1791303333-689202-aea0.log`.
- TDD RED: `python3 scripts/vc6-obmalloc-arena-map-mark-used-c89.test.py cpython/Objects/obmalloc.c` — exit 1 before source edit; expected assertion that `n_hi`, `i3`, and `tail` must be declared at function entry.
- Focused GREEN and directly applicable obmalloc checks: the new arena-map test, `vc6-obmalloc-rawwcsdup-c89.test.py`, allocator-name, default-allocator, setup-allocators, and tracemalloc-init scripts — all exit 0. RawWcsdup script's C89 compile/runtime harness passed.
- Applicable harness: `bash scripts/vc6-probe-pythoncore-frontier.test.sh` — exit 1. Many checks, including `_thread`, tracemalloc, and object regressions, pass. Existing numeric-dispatch check still raises `ValueError: substring not found`; no unrelated failures were changed. Capture: `build/cron-current/regression.log`.
- Post-change forced-fresh probe (same command as pre-change, captured in `build/cron-current/post-arena-mark-used.log`) — exit 2; `total=101 compiled=100 cached=0 skipped=0`. The errors at lines 1539-1545 are gone and compilation passes through the edited declarations. First remaining diagnostic is C2275 at `obmalloc.c(1562)` for the separate late `uintptr_t arena_base_next` declaration, followed by independent late `n_lo` and `i3_next` declarations and then `arena_map_is_used()` C89/type diagnostics. These are not addressed in this slice.
- `git -C cpython diff --check -- Objects/obmalloc.c` and `git diff --check -- scripts/vc6-obmalloc-arena-map-mark-used-c89.test.py` — exit 0. Baseline tag/commit unchanged.

Files changed by this slice: `cpython/Objects/obmalloc.c`, new `scripts/vc6-obmalloc-arena-map-mark-used-c89.test.py`, and this status entry. This is compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution. Next: fresh forced-fresh probe before any change; then address only the first current declaration blocker (`arena_base_next` in the `else` branch) with a separate TDD slice, preserving its original evaluation point. No commit or push.

---

## Previous latest run (fresh radix-tree frontier confirmed; coding lane unavailable)

Date: 2026-10-06 14:14 UTC

Read `PORT_STATUS.md`, `README.md`, and the active-profile CPython Win9x/MSVC6 reference. Preserved all existing outer and detached CPython modifications; no reset, clean, stash, discard, commit, push, patch regeneration, or publication. CPython remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`.

The recorded `_Py_GetAllocatedBlocks()` fix remains present, but the recorded next-frontier summary was broad. A forced-fresh VC6/Wine source-list probe now confirms the actual first stable blocker is within `arena_map_mark_used()` in `Objects/obmalloc.c`: late declarations at lines 1539 (`arena_map_bot_t *n_hi`), 1544 (`int i3`), and 1545 (`int32_t tail`). Later declarations in the same function and the distinct `arena_map_is_used()` function remain separate; no source/test implementation was made. A focused Hermes coding-agent lane was attempted as required, but failed before startup because the Anthropic provider package is missing and lazy installs are disabled. No source edits were made.

Exact verification:

- `XDG_RUNTIME_DIR="$PWD/build/cron-current/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-current/cron-reprobe.log 2>&1` — exit 2; `total=101 compiled=100 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First compiler diagnostics: C2143 at `obmalloc.c(1539)` and `(1544)`; then C2275/C2146 for `int32_t tail` at `(1545)`. Further errors at lines 1558 onward include distinct late declarations and cascades. Capture: `build/cron-current/cron-reprobe.log`.
- Focused existing regression: `python3 scripts/vc6-obmalloc-rawwcsdup-c89.test.py cpython/Objects/obmalloc.c` — exit 0; allocated-block and RawWcsdup checks passed.
- `bash scripts/vc6-probe-pythoncore-frontier.test.sh > build/cron-current/cron-regression.log 2>&1` — exit 1; existing unrelated numeric-dispatch assertion raised `ValueError: substring not found`. No broad-suite pass claimed.
- `git -C cpython diff --check -- Objects/obmalloc.c` and `git diff --check -- PORT_STATUS.md` — exit 0.

Files changed this run: `PORT_STATUS.md` only. This is diagnostics/compiler-probe evidence, not a linked `pythoncore.dll`/`python.exe`, Wine interpreter run, or Windows 98 SE result. Next: once a focused coding agent can start, TDD only the `arena_map_mark_used()` declaration-order family, preserving initializer evaluation points; do not change `arena_map_is_used()` or address separate type/API blockers. No commit or push.

---

## Latest revision (`_Py_GetAllocatedBlocks` base declaration made C89-compatible; frontier advances)

Date: 2026-10-06 UTC

Read `PORT_STATUS.md`, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved all existing dirty outer and detached CPython changes; no reset, clean, stash, discard, commit, push, publication, or patch regeneration. CPython remains tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`.

The recorded `_Py_GetAllocatedBlocks()` frontier was freshly confirmed with forced-fresh MSVC600/Wine probing. `_blake2/blake2s_impl.c` compiled; the first blocker was C2143 at `Objects/obmalloc.c(1311)` on the late `uintptr_t base` declaration, followed by C2065 `base` at line 1314. One focused Codex CLI lane (`codex-cli 0.153.4`, workspace-write; session `01a11117-24ea-7ee0-bdcf-6a66cfbea801`) followed TDD. It extended the existing `scripts/vc6-obmalloc-rawwcsdup-c89.test.py`, observed RED before production edit, then hoisted only `uintptr_t base` into the function declaration group and converted the former initialized declaration to assignment at its original point after the arena skip. No other production statements or control flow were changed. A content-hash snapshot verified all 132 other pre-existing dirty/untracked files remained unchanged.

Exact verification:

- Pre-change forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/cron-current/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-current/reprobe.log 2>&1` — script exit 2 (compiler source-list failure); `total=101 compiled=100 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First diagnostics C2143 at `obmalloc.c(1311)`, then C2065 `base` at 1314. Capture: `build/cron-current/reprobe.log`.
- TDD RED before production edit: `python3 scripts/vc6-obmalloc-rawwcsdup-c89.test.py cpython/Objects/obmalloc.c` — exit 1 with the expected `_Py_GetAllocatedBlocks must declare uint i and uintptr_t base at entry and preserve loop operations` assertion.
- Focused GREEN: same command — exit 0; both allocated-block C89/order and RawWcsdup C89 runtime checks passed.
- Focused obmalloc regressions: allocator-name, default allocator, setup-allocators, and tracemalloc-init scripts (the latter with `cpython/Include/internal/pycore_pymem.h`) — all exit 0. One initial tracemalloc invocation used a nonexistent `pycore_tracemalloc.h` and exited 1; corrected invocation passed.
- Applicable harness: `bash scripts/vc6-probe-pythoncore-frontier.test.sh > build/cron-current/regression.log 2>&1` — exit 1; existing `ValueError: substring not found` regression failure remains. No broad-suite pass claimed.
- Post-change forced-fresh probe (same command as pre-change, output `build/cron-current/postprobe.log`) — exit 2; `total=101 compiled=100 cached=0 skipped=0`. The line-1311/1314 diagnostics are gone; remaining obmalloc failures concern distinct radix-tree/C89/type issues, first visible at lines 1539 onward. `_blake2/blake2s_impl.c` compiled. No claim that `obmalloc.c` fully compiles.
- Scoped nested and outer `git diff --check` — exit 0. CPython exact tag/commit checks passed.

Files changed by this slice: `cpython/Objects/obmalloc.c`, `scripts/vc6-obmalloc-rawwcsdup-c89.test.py`, and this status log. This is compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution. Next: freshly re-probe before edits; inspect only the first stable current compiler diagnostic within the still-failing `obmalloc.c` translation unit. No commit or push.

---

## Previous latest revision (`_Py_GetAllocatedBlocks` loop declaration made C89-compatible; frontier advances)

Date: 2026-10-06 09:54 UTC

Read this status, `README.md`, and the CPython Win9x/MSVC6 reference before acting. Preserved the pre-existing dirty outer worktree and detached CPython changes; no reset, clean, stash, discard, commit, push, publication, or patch regeneration. CPython remains at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`.

The recorded `_PyMem_Strdup()` frontier was re-probed before editing. The forced-fresh MSVC600/Wine source-list probe passed `_blake2/blake2s_impl.c`; first blocker remained `Objects/obmalloc.c(1304)`, the C99 `for (uint i = ...)` declaration in `_Py_GetAllocatedBlocks()`. Hermes subagent delegation was unavailable because the runtime lacks the `anthropic` package and lazy installs are disabled. One focused Codex CLI lane (`codex-cli 0.153.4`, workspace-write) performed the TDD slice: extended the existing untracked `scripts/vc6-obmalloc-rawwcsdup-c89.test.py` with a function-body/order assertion, observed RED before production edit, then hoisted only `uint i` into the function declaration group and changed the loop initializer to assignment. Loop bound, iteration, skip behavior, and accumulation are retained. All other local work was preserved.

Exact verification:

- Pre-change forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/cron-current/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2; `total=101 compiled=100 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First errors C2143 at `obmalloc.c(1304)` on the `for` declaration, followed by undeclared `i`; later C89 and arena-map/type errors were distinct. Capture: `build/cron-current/preprobe.log`.
- TDD RED: focused assertion in `scripts/vc6-obmalloc-rawwcsdup-c89.test.py` was reported by the coding lane as failing before the source edit because the entry declaration/C89 loop spelling was absent. (The lane's terminal transcript was truncated to its final diff in the returned output.)
- Focused GREEN/regressions: `python3 scripts/vc6-obmalloc-rawwcsdup-c89.test.py cpython/Objects/obmalloc.c && python3 scripts/vc6-obmalloc-allocator-name-c89.test.py cpython/Objects/obmalloc.c && python3 scripts/vc6-obmalloc-default-allocator-c89.test.py cpython/Objects/obmalloc.c && python3 scripts/vc6-obmalloc-setup-allocators-c89.test.py cpython/Objects/obmalloc.c && python3 scripts/vc6-obmalloc-tracemalloc-init-c89.test.py cpython/Objects/obmalloc.c cpython/Include/internal/pycore_pymem.h` — exit 0; all five passed.
- Applicable regression harness: `bash scripts/vc6-probe-pythoncore-frontier.test.sh` — exit 1. Existing unrelated console type detection/cleanup-order assertion and numeric-dispatch (`ValueError: substring not found`) failures persist; no broad-suite pass claimed.
- Post-change forced-fresh probe (same command) — exit 2; `total=101 compiled=100 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled; prior line-1304 diagnostics are gone. First remaining errors are C2143 at `obmalloc.c(1311)` and C2065 `base` at 1314, followed by separate allocator arena-map/API/type issues. Capture: `build/cron-current/postprobe.log`.
- `git -C cpython diff --check -- Objects/obmalloc.c`, `git diff --check -- scripts/vc6-obmalloc-rawwcsdup-c89.test.py`, CPython baseline tag/commit checks — exit 0. No commit or push.

Files changed by this slice: `cpython/Objects/obmalloc.c`, `scripts/vc6-obmalloc-rawwcsdup-c89.test.py`, and this status log. Compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution. Next: fresh forced probe before any change; likely inspect the next declaration at `obmalloc.c(1311)` while keeping later arena-map/type/API diagnostics separate.

---

## Previous latest revision (`_PyMem_Strdup` C89 declarations hoisted; probe advances)

Date: 2026-10-06 07:27 UTC

Read `PORT_STATUS.md`, `README.md`, and the active CPython Win9x/MSVC6 reference before acting. Preserved the dirty outer worktree and detached CPython changes; no reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. CPython remains at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`.

The previously recorded `_PyMem_Strdup()` frontier was revalidated with a forced-fresh MSVC600/Wine source-list probe. `_blake2/blake2s_impl.c` compiled and the first failing translation unit was `Objects/obmalloc.c`; VC6 reported C2143 at lines 713-714 before the late `size_t size` / `char *copy` declarations, then undeclared-variable cascades. One focused Codex CLI lane (0.153.4, workspace-write; session `01a11020-6ea2-7702-91e3-42cfddc5ea95`) followed TDD: added an assertion for `_PyMem_Strdup()` to `scripts/vc6-obmalloc-rawwcsdup-c89.test.py`, observed the expected RED before production edits, then hoisted only those two declarations to function entry and retained initialization after `assert` plus allocation/null/copy/return order. A file-hash and inventory comparison confirmed every other dirty/untracked file was preserved.

Exact verification:

- Pre-change forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/cron-current/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2; `total=101 compiled=100 cached=0 skipped=0`. First errors C2143 at `obmalloc.c(713-714)`, then C2065 cascades for `copy` and `size`. `_blake2/blake2s_impl.c` compiled.
- TDD RED: `python3 scripts/vc6-obmalloc-rawwcsdup-c89.test.py cpython/Objects/obmalloc.c` — exit 1 with expected `_PyMem_Strdup must use C89 entry declarations and preserve operation order` assertion.
- Focused GREEN/regressions: `python3 scripts/vc6-obmalloc-rawwcsdup-c89.test.py cpython/Objects/obmalloc.c && python3 scripts/vc6-obmalloc-allocator-name-c89.test.py cpython/Objects/obmalloc.c && python3 scripts/vc6-obmalloc-default-allocator-c89.test.py cpython/Objects/obmalloc.c && python3 scripts/vc6-obmalloc-setup-allocators-c89.test.py cpython/Objects/obmalloc.c && python3 scripts/vc6-obmalloc-tracemalloc-init-c89.test.py cpython/Objects/obmalloc.c cpython/Include/internal/pycore_pymem.h` — exit 0; all five passed. An earlier tracemalloc invocation omitted its required header argument and exited 1; the corrected exact command above passed.
- Applicable harness: `bash scripts/vc6-probe-pythoncore-frontier.test.sh` — exit 1; existing unrelated console type detection/cleanup ordering and numeric-dispatch (`ValueError: substring not found`) assertions persist. The obmalloc tests passed; no broad-suite pass claimed.
- Post-change forced-fresh probe (same as pre-change, redirected to `build/cron-current/strdup-post.log`) — exit 2; `total=101 compiled=100 cached=0 skipped=0`. The `_PyMem_Strdup()` diagnostics at lines 713-719 are gone. Next first compiler error is C2143 at `obmalloc.c(1304)` for a `for` loop declaration; subsequent failures include the distinct obmalloc C89/API issues (including missing `int32_t`-related type parsing) and remain untouched. Compiler probe only.
- `git -C cpython diff --check -- Objects/obmalloc.c`, `git diff --check -- scripts/vc6-obmalloc-rawwcsdup-c89.test.py`, and exact CPython tag/commit checks — exit 0; baseline unchanged.

Files changed by this slice: `cpython/Objects/obmalloc.c`, `scripts/vc6-obmalloc-rawwcsdup-c89.test.py`, and this status log. This is not a linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE verification. Next frontier: fresh forced probe before any further edits, then isolate the earliest remaining `obmalloc.c` C89 loop declaration at line 1304 as its own TDD slice. No commit or push.

---

## Previous latest revision (fresh VC6 frontier confirmed; focused implementation delegation unavailable)

Date: 2026-10-06 01:05 UTC

Read `PORT_STATUS.md`, `README.md`, and the CPython Win9x/MSVC6 reference before acting. Preserved all pre-existing outer and detached CPython changes; no reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. CPython remains at `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`.

The recorded `_PyMem_RawStrdup()` frontier was freshly confirmed with a forced-fresh MSVC600/Wine source-list probe. `_blake2/blake2s_impl.c` compiled; the first failing translation unit remains `Objects/obmalloc.c`. First stable errors are C2143 at lines 697-698 on declarations after `assert`, with C2065 cascades for `copy` and `size`. The neighboring `_PyMem_Strdup()` errors at 710-711 and later obmalloc diagnostics are distinct and untouched. One focused coding-agent delegation for the single `_PyMem_RawStrdup()` slice was attempted, but did not start because the Hermes runtime lacks the `anthropic` package and lazy installs are disabled. No production or test edits were made; this run is diagnostics-only.

Exact verification:

- Forced-fresh VC6/Wine probe: `XDG_RUNTIME_DIR="$PWD/build/cron-current/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2; `total=101 compiled=100 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First diagnostics C2143 at `obmalloc.c(697-698)`, followed by C2065 `copy` and `size` cascades. Full output: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1791248452-462887-c640.log`.
- Focused obmalloc regressions: `python3 scripts/vc6-obmalloc-rawwcsdup-c89.test.py cpython/Objects/obmalloc.c && python3 scripts/vc6-obmalloc-setup-allocators-c89.test.py cpython/Objects/obmalloc.c && python3 scripts/vc6-obmalloc-default-allocator-c89.test.py cpython/Objects/obmalloc.c && python3 scripts/vc6-obmalloc-tracemalloc-init-c89.test.py cpython/Objects/obmalloc.c cpython/Include/internal/pycore_pymem.h` — exit 0; all four passed.
- Applicable harness: `bash scripts/vc6-probe-pythoncore-frontier.test.sh` — exit 1. The relevant obmalloc checks passed; two known unrelated failures persist: console type detection/cleanup order and numeric dispatch (`ValueError: substring not found`). No suite-wide pass claimed.
- Delegation attempt for only `_PyMem_RawStrdup()` — failed before agent startup: missing `anthropic` package; lazy installs disabled. No child edits were applied.
- `git -C cpython diff --check -- Objects/obmalloc.c`, `git diff --check -- PORT_STATUS.md`, and CPython exact tag/commit checks — exit 0; baseline unchanged.

Files changed this run: `PORT_STATUS.md` only. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution. Next: retry one focused TDD coding lane when delegation is available, limited to `_PyMem_RawStrdup()`'s declaration family; keep `_PyMem_Strdup()` and later obmalloc blockers separate.

---

Date: 2026-10-05 22:59 UTC

Read `PORT_STATUS.md`, `README.md`, and the active-profile CPython Win9x/MSVC6 reference first. Preserved all pre-existing outer and detached CPython changes; no reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. Baseline remains CPython `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`.

The recorded `_PyMem_RawStrdup()` frontier was forced-fresh re-probed and remains current. The source-list compile built `_blake2/blake2s_impl.c` and `Objects/object.c`; `Objects/obmalloc.c` is the first failing translation unit. First stable errors are C2143 at lines 697 and 698, before `size_t size` and `char *copy` declarations following `assert(str != NULL)`, then C2065 cascades for `copy` and `size`. This confirms the frontier but not a source fix. Per the required workflow, one focused coding-subagent delegation was attempted for this function only and failed before startup because Hermes lacks the `anthropic` package and lazy installs are disabled. No source or test edits were made; this run is diagnostics-only.

Exact verification:

- Forced-fresh VC6/Wine probe: `XDG_RUNTIME_DIR="$PWD/build/cron-current/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2; `total=101 compiled=100 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First stable compiler diagnostics are C2143 at `obmalloc.c(697-698)`, with C2065 cascades at 699/702. Later independent C89/API diagnostics remain in `obmalloc.c` and were not addressed. Full output: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1791240907-436248-f100.log`.
- Focused obmalloc regressions: `python3 scripts/vc6-obmalloc-rawwcsdup-c89.test.py cpython/Objects/obmalloc.c && python3 scripts/vc6-obmalloc-setup-allocators-c89.test.py cpython/Objects/obmalloc.c && python3 scripts/vc6-obmalloc-default-allocator-c89.test.py cpython/Objects/obmalloc.c && python3 scripts/vc6-obmalloc-tracemalloc-init-c89.test.py cpython/Objects/obmalloc.c cpython/Include/internal/pycore_pymem.h` — exit 0; all four passed.
- Applicable harness: `bash scripts/vc6-probe-pythoncore-frontier.test.sh` — exit 1. The relevant obmalloc checks pass; the two known unrelated failures persist: console type detection/cleanup order and numeric dispatch (`ValueError: substring not found`). No broad-suite pass claimed.
- Focused implementation delegation for only `_PyMem_RawStrdup()` — failed before agent startup: missing `anthropic` package; lazy installs disabled. No source/test edits were applied.
- `git -C cpython diff --check -- Objects/obmalloc.c`, `git diff --check -- PORT_STATUS.md`, and CPython exact tag/commit checks — exit 0; baseline unchanged.

Files changed this run: `PORT_STATUS.md` only. All pre-existing changes remain preserved. This is compiler-probe evidence only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution. Next: retry a focused TDD coding lane when delegation is available, limiting implementation to the declaration family in `_PyMem_RawStrdup()`; otherwise continue diagnostics only. Keep `_PyMem_Strdup()` and later obmalloc blockers separate. Preserved all pre-existing outer and detached CPython changes; no reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. Baseline remains CPython `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`.

The prior status recorded the post-`_PyMem_RawWcsdup()` next probe as blocked at Wine startup, so the compiler frontier was unverified. A forced-fresh probe now ran successfully through the source list. `_blake2/blake2s_impl.c` and `Objects/object.c` compiled. The first stable VC6 errors are in the separate `_PyMem_RawStrdup()` at `Objects/obmalloc.c(697-698)`: C2143 before `size_t size`, then before `char *copy`, followed by undeclared-variable cascades. The source confirms both declarations follow `assert(str != NULL)`. `_PyMem_Strdup()` has a similar later issue at 710-711, but it is a distinct later function and remains untouched.

Attempted the required single focused coding-subagent delegation for only `_PyMem_RawStrdup()`; it failed before startup because Hermes lacks the `anthropic` package and lazy installs are disabled. Per the delegated-lane requirement, made no production or test edits. Ran current focused obmalloc regressions as diagnostics; all passed. The applicable broader harness still has its two known unrelated failures, so no broad-suite pass is claimed.

Exact verification:

- Forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/cron-current/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2; `total=101 compiled=100 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First errors: C2143 at `obmalloc.c(697)` and `(698)`, followed by C2065 `copy` and `size` cascades. Full output: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1791233276-411114-ad70.log`.
- Focused regressions: `python3 scripts/vc6-obmalloc-rawwcsdup-c89.test.py cpython/Objects/obmalloc.c && python3 scripts/vc6-obmalloc-setup-allocators-c89.test.py cpython/Objects/obmalloc.c && python3 scripts/vc6-obmalloc-default-allocator-c89.test.py cpython/Objects/obmalloc.c && python3 scripts/vc6-obmalloc-tracemalloc-init-c89.test.py cpython/Objects/obmalloc.c cpython/Include/internal/pycore_pymem.h` — exit 0; all four passed.
- Applicable regression harness: `bash scripts/vc6-probe-pythoncore-frontier.test.sh` — exit 1. Known unrelated console type detection/cleanup order and numeric dispatch (`ValueError: substring not found`) failures remain; relevant obmalloc checks passed.
- Delegation attempt for the one `_PyMem_RawStrdup()` TDD slice — failed before agent startup: missing `anthropic` package; lazy installs disabled. No source/test edits applied.
- `git -C cpython rev-parse HEAD`, `git -C cpython describe --tags --exact-match HEAD`, outer `git diff --check`, and `git -C cpython diff --check -- Objects/obmalloc.c` — exit 0; baseline unchanged and scoped diffs clean.

Files changed this run: `PORT_STATUS.md` only. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution. Next frontier: one test-first slice for `_PyMem_RawStrdup()` only after a focused coding lane is available; keep `_PyMem_Strdup()` and later obmalloc errors separate.

---

## Previous latest revision (_PyMem_RawWcsdup C89 declarations hoisted; post-change VC6 probe blocked by Wine)

Date: 2026-10-05 UTC

Read `PORT_STATUS.md`, `README.md`, and the active-profile CPython Win9x/MSVC6 reference first. Preserved all pre-existing outer and detached CPython changes; no reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. CPython remains at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`.

The recorded `_PyMem_SetupAllocators()` frontier was stale. A forced-fresh VC6/Wine source-list probe passed `_blake2/blake2s_impl.c`, `Objects/object.c`, and the allocator setup functions; the actual first diagnostics were C2143/C2065 at `Objects/obmalloc.c(674-675)` in `_PyMem_RawWcsdup()`, for `size_t len` declared after `assert`. One focused Codex CLI lane (0.153.4, workspace-write; session `01a10d62-5acc-7532-8e6a-64eee226a083`) hoisted only `len`, `size`, and `str2` to the function's declaration group and changed their original declarations to assignments at the same execution points. The overflow guard, allocation, failure return, copy size, and return order are unchanged.

Exact verification:

- Before-change forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/cron-current/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2; `total=101 compiled=100 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First stable diagnostics C2143 at `obmalloc.c(674)` before `type`, C2065 `len` at 675, with distinct C89 declarations later in adjacent helpers and other obmalloc code. Full capture: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1791225631-384995-c8a0.log`.
- TDD RED: `python3 scripts/vc6-obmalloc-rawwcsdup-c89.test.py cpython/Objects/obmalloc.c` — exit 1 before the source edit; generated C harness failed under `-std=c89 -pedantic-errors` on the original mixed declarations at lines 33 and 38. The first harness invocation also exposed an unescaped regex-quote construction error, corrected before the expected RED; no production edit preceded the RED.
- GREEN after source edit: same focused command — exit 0; generated exact-function C89 harness passed copy, empty-string, allocation-failure, and overflow/order checks.
- Existing focused obmalloc allocator-name, default-allocator, setup-allocators, and tracemalloc-init regressions — exit 0. Applicable full regression harness was not run in this slice.
- Post-change forced-fresh probe (same command) — exit 1 before any compiler invocation; Wine reported `sock_init: ERROR in sock_check_pollhup()` and `wineserver: error creating /run/user/1000/wine/server-801-136fb0/lock: Read-only file system`, summary `total=1 compiled=0 cached=0 skipped=0`. This is a Wine startup failure, not compiler evidence; next compiler frontier is unverified. A retry was not made to avoid repeatedly invoking a broken shared Wine server.
- `git -C cpython diff --check -- Objects/obmalloc.c` and outer `git diff --check -- scripts/vc6-obmalloc-rawwcsdup-c89.test.py` — exit 0. Baseline commit unchanged.

Files changed by this slice: `cpython/Objects/obmalloc.c`, new `scripts/vc6-obmalloc-rawwcsdup-c89.test.py`, and this status entry. This is source-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next: restore a writable Wine server runtime and run the forced-fresh probe before choosing any further edit; only then follow its first stable compiler blocker (expected adjacent helper declarations are not yet confirmed as frontier).

---

## Previous latest revision (_PyMem_SetupAllocators pymalloc declaration moved before statements)

Date: 2026-10-05 16:38 UTC

Read `PORT_STATUS.md`, `README.md`, and the active-profile CPython Win9x/MSVC6 reference before working. Preserved the existing dirty outer and detached CPython work; no reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. CPython remains at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`.

The recorded `_blake2/blake2s_impl.c` sequence was verified with a forced-fresh MSVC600/Wine source-list probe. `_blake2/blake2s_impl.c` and `Objects/object.c` compiled. The first blocker was `Objects/obmalloc.c(349)`: C2275/C2146/C2065/C2059 on the late `PyMemAllocatorEx pymalloc = PYMALLOC_ALLOC` declaration after the RAW allocator registration in `_PyMem_SetupAllocators()`. Native coding-subagent delegation failed because the Hermes runtime lacks the `anthropic` package; one focused Codex CLI lane (`codex-cli 0.153.4`, workspace-write; session `01a10ce7-820c-7ee3-9e1f-ecb1c0f5a7bd`) followed TDD. It added `scripts/vc6-obmalloc-setup-allocators-c89.test.py`, observed expected RED before the production edit, then moved only the `pymalloc` initialized declaration above the first statement. All initializer values and RAW/MEM/OBJ/debug-hook order are retained. No subsequent `obmalloc.c` diagnostics were changed.

Exact verification:

- Before-change forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/cron-current/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2; `total=101 compiled=100 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled; first diagnostics were C2275/C2146/C2065/C2059 at line 349. Full output: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1791217565-339027-c050.log`.
- TDD RED: `python3 scripts/vc6-obmalloc-setup-allocators-c89.test.py cpython/Objects/obmalloc.c` — exit 1; expected assertion `both allocator initializers must precede the first statement for C89`.
- GREEN and focused regressions: setup-allocators, default-allocator, and tracemalloc-init scripts — all exit 0. The setup test confirms field values and RAW/MEM/OBJ/debug order.
- Applicable regression harness: `bash scripts/vc6-probe-pythoncore-frontier.test.sh > build/cron-current/regression-suite.log 2>&1` — exit 1. Two pre-existing unrelated failures remain: console type detection/cleanup ordering and numeric dispatch (`ValueError: substring not found`). No suite-wide pass claimed.
- Post-change forced-fresh probe (same exact command as before-change) — exit 2; `total=101 compiled=100 cached=0 skipped=0`. The line-349 diagnostics are gone; first remaining diagnostics are C2275/C2146/C2065/C2059 at `obmalloc.c(412-414)` for separate `dbg_raw`, `dbg_mem`, and `dbg_obj` initializers. Later errors untouched. Full output: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1791218002-339027-ce90.log`.
- Scoped outer/nested `git diff --check` — exit 0. Baseline tag/commit unchanged. Preservation snapshot from the coding lane reports all other 130 pre-existing dirty/untracked files unchanged; this is consistent with the observed scoped diff/status.

Files changed by this slice: `cpython/Objects/obmalloc.c`, new `scripts/vc6-obmalloc-setup-allocators-c89.test.py`, and this status entry. Compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution. Next: fresh forced-fresh probe before edits, then address only the new first blocker at `obmalloc.c(412-414)` involving the three debug allocator declarations with TDD; retain all later diagnostics and the known unrelated regression failures separately.

---

## Previous latest revision (default allocator switch assignments made VC6-compatible)

Date: 2026-10-05 UTC

Preserved all pre-existing outer and detached CPython work; no reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. CPython remains at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Read this status, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. One focused Codex CLI lane (`codex-cli 0.153.4`, session `01a10c6e-4002-7c23-93c1-b9f41270f3ed`, workspace-write) was used for the one implementation slice; no commit or push.

The recorded `_blake2/blake2s_impl.c` frontier was freshly rechecked before editing. The source compiled, and the actual first blocker was the three cast-to-braced-initializer assignments in `pymem_set_default_allocator()` (`obmalloc.c` lines 244, 247, 250), rejected by VC6 with C2059 on `{`. Strict TDD updated the focused default-allocator test first and observed RED. The minimal production change wraps each RAW/MEM/OBJ case in a C89 block, initializes a local `PyMemAllocatorEx` from the same allocator macro, then copies it into `new_alloc`. Branch selection, allocator fields (including context and all callbacks), setter/debug-hook ordering, and return behavior are retained. No subsequent `obmalloc.c` errors were changed.

Exact commands and results:

- Before-change forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/cron-current/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2; `total=101 compiled=100 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First stable diagnostic group: C2059 `{` at `obmalloc.c(244)`, `(247)`, `(250)`. Full captured output: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1791209613-304480-c2b0.log`.
- TDD RED: `python3 scripts/vc6-obmalloc-default-allocator-c89.test.py cpython/Objects/obmalloc.c` — exit 1 before production edit, expected failure that switch assignments/order did not match the VC6-compatible local-copy semantics.
- GREEN and focused regression: same default-allocator command — exit 0; `obmalloc default allocator C89 assignments, allocator semantics, and execution order: PASS`.
- Tracemalloc regression: `python3 scripts/vc6-obmalloc-tracemalloc-init-c89.test.py cpython/Objects/obmalloc.c cpython/Include/internal/pycore_pymem.h` — exit 0; positional initializer defaults match header field order.
- Applicable regression harness: `bash scripts/vc6-probe-pythoncore-frontier.test.sh > /tmp/obmalloc-slice-frontier-test.log 2>&1` — exit 1. Two known unrelated checks remain failing: console type detection/cleanup order and numeric dispatch (`ValueError: substring not found`). No suite-wide pass claimed.
- Post-change forced-fresh probe (same command as pre-change) — exit 2; `total=101 compiled=100 cached=0 skipped=0`. The former C2059 diagnostics at lines 244/247/250 are gone. The first remaining group is at `obmalloc.c(349)`: C2275/C2146/C2065/C2059 for `PyMemAllocatorEx pymalloc` and its braced initializer in a separate allocator setup function; leave this declaration/initializer family for the next slice. Further diagnostics in obmalloc.c are distinct and untouched. Full output: `build/cron-current/post-allocator-probe.log`.
- `git -C cpython diff --check -- Objects/obmalloc.c`, `git diff --check -- scripts/vc6-obmalloc-default-allocator-c89.test.py`, and baseline `git -C cpython rev-parse HEAD` — exit 0; baseline hash unchanged.

Files changed by this slice: `cpython/Objects/obmalloc.c`, `scripts/vc6-obmalloc-default-allocator-c89.test.py`, and this status entry. A pre-edit snapshot confirmed no other pre-existing dirty/untracked file content changed by the focused coding lane. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution. Next: perform a fresh forced-fresh probe, then use TDD on only the new first blocker, `PyMemAllocatorEx pymalloc` in `_PyMem_SetupAllocators()`; keep later obmalloc declarations, designated initializers, allocator-map/platform compatibility errors, and the two unrelated regression failures separate.

---

## Latest revision (tracemalloc configuration initializer converted for VC6)

Date: 2026-10-05 09:57 UTC

Read `PORT_STATUS.md`, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved the pre-existing outer and nested dirty work; no reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. CPython remains at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`.

The recorded `_blake2/blake2s_impl.c` state was verified with a forced-fresh MSVC600/Wine source-list probe before editing. `_blake2/blake2s_impl.c` and `Objects/object.c` compiled. First blocker remained `Objects/obmalloc.c(89)`, C2059 on `.` in `_PyTraceMalloc_Config_INIT`'s C99 designated initializer. One focused Codex CLI lane (`codex-cli 0.153.4`, workspace-write; session `01a10b79-c7ce-7ce2-b7bd-003a9d5ef9ac`) performed a strict TDD slice. It added `scripts/vc6-obmalloc-tracemalloc-init-c89.test.py`, first ran it RED against the original source, then replaced only the initializer in `cpython/Objects/obmalloc.c` with positional values `TRACEMALLOC_NOT_INITIALIZED, 0, 1`. Verified header field order is `initialized, tracing, max_nframe`; values preserve defaults. No later allocator/C89 errors were changed.

Exact verification:

- Before-change forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/cron-current/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2; `total=101 compiled=100 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First diagnostic: `cpython\\Objects\\obmalloc.c(89) : error C2059: syntax error : '.'`. Full log: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1791193614-235796-7820.log`.
- TDD RED: `python3 scripts/vc6-obmalloc-tracemalloc-init-c89.test.py cpython/Objects/obmalloc.c cpython/Include/internal/pycore_pymem.h` — exit 1; expected assertion `_Py_tracemalloc_config must use a VC6-compatible positional initializer`.
- TDD GREEN and independent focused rerun: same command — exit 0; `obmalloc tracemalloc C89 positional initializer: PASS (initialized=TRACEMALLOC_NOT_INITIALIZED, tracing=0, max_nframe=1)`.
- Applicable regression harness: `bash scripts/vc6-probe-pythoncore-frontier.test.sh` — exit 1. Tracemalloc and `_thread` regression checks passed. Two known unrelated failures remain: console type detection/cleanup order and numeric dispatch (`ValueError: substring not found`). No suite-wide pass claimed.
- Post-change forced-fresh probe (same command as before-change): exit 2; `total=101 compiled=100 cached=0 skipped=0`. The C2059 at `obmalloc.c(89)` is gone; `obmalloc.c` first reports C2275/C2146/C2065 at line 239 for late `PyMemAllocatorEx new_alloc`, followed by related initializer/cascade errors. Separate C89/API/type blockers remain untouched. Full log: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1791193985-235796-2b10.log`.
- `git -C cpython diff --check -- Objects/obmalloc.c` and `git diff --check -- scripts/vc6-obmalloc-tracemalloc-init-c89.test.py` — exit 0. CPython baseline tag/commit unchanged.

Files changed by this slice: `cpython/Objects/obmalloc.c`, new `scripts/vc6-obmalloc-tracemalloc-init-c89.test.py`, and `PORT_STATUS.md`. This is compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution. Next frontier: perform a fresh forced probe, then address only the first current `obmalloc.c` declaration family (`PyMemAllocatorEx new_alloc` near line 239) with TDD; keep subsequent initializer/declaration errors separate.

---

## Previous latest revision (fresh VC6 frontier recheck; implementation lane unavailable)

Date: 2026-10-05 UTC

Read `PORT_STATUS.md`, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved all pre-existing outer and detached CPython work; no reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. CPython remains at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`.

The recorded `_blake2/blake2s_impl.c` compiler state was rechecked using the forced-fresh source-list probe. `_blake2/blake2s_impl.c` and `Objects/object.c` compile; the actual first blocker has advanced to `Objects/obmalloc.c(89)`, C2059 on `.` in the `_PyTraceMalloc_Config_INIT` designated initializer. A single focused implementation delegation was attempted for only that initializer family. Delegation could not start because the Hermes delegation runtime lacks the `anthropic` package and lazy installs are disabled. In keeping with the delegated-lane requirement, made no production or test edits; this run is diagnostics-only. Later `obmalloc.c` declaration/initializer errors were left untouched.

Exact verification:

- Forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/cron-current/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2; `total=101 compiled=100 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First compiler diagnostic: `cpython\\Objects\\obmalloc.c(89) : error C2059: syntax error : '.'`. Full log: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1791186043-210799-43e0.log`. The invocation ran VC6 `cl.exe` through Wine; it did not emit a standalone compiler version banner.
- Focused delegation for the single line-89 initializer family — failed before agent startup: `The 'anthropic' package is required ... venv: not installed and lazy installs are disabled: ['anthropic']`. No delegated edits were applied.
- Applicable regression suite: `bash scripts/vc6-probe-pythoncore-frontier.test.sh` — exit 1. The suite's relevant existing checks run; two known unrelated failures remain: console type detection/cleanup order and numeric dispatch (`ValueError: substring not found`). No obmalloc-specific regression exists yet; no code was changed in this diagnostics-only run.
- Worktree/baseline check: outer pre-existing dirty entries and detached CPython modifications were retained; `cpython` remains exactly at `v3.11.16`, `41388c9cb160d0886d5ca00d2e6c878260a8a4549`.

Files changed this run: `PORT_STATUS.md` only. Compiler-probe progress only: no `pythoncore.dll`/`python.exe` link, Wine interpreter execution, or real Windows 98 SE execution. Next frontier remains the single designated initializer at `obmalloc.c(89)`; retry one focused TDD coding lane when delegation is available, preserving every other local change.

---

## Previous latest revision (_PyTypes_FiniTypes loop counter made C89-compatible; frontier advances)

Date: 2026-10-05 UTC

Read `PORT_STATUS.md`, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved all existing outer and detached CPython work; no reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. CPython baseline remains tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`.

The previously recorded frontier was freshly confirmed before editing. The forced-fresh MSVC600/Wine probe compiled `_blake2/blake2s_impl.c` and reached `Objects/object.c`; first diagnostics were C2143/C2065 at line 2093 for the C99 `for (Py_ssize_t i=...)` in `_PyTypes_FiniTypes()`. One focused Codex CLI lane (`codex-cli 0.153.4`, workspace-write; session `01a10a8c-b70d-7480-a8ec-5918918fecbd`) extended `scripts/vc6-object-notimplemented-c89.test.py`, ran the new assertion RED (expected missing function-entry `Py_ssize_t i`), then hoisted only that loop counter to the function declaration group and reused it in the loop. Reverse bounds/traversal, main-interpreter guard, per-item type lookup and deallocation order are preserved. `_PyTypes_FiniTypes()`'s existing inner `PyTypeObject *type` is the first declaration in its loop block, so no change there was needed.

Exact verification:

- Before-change forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/cron-current/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2; `total=100 compiled=99 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First diagnostics C2143/C2065 at `object.c(2093)` on the C99 loop declaration; dependent errors at 2095/2097. Log: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1791178068-168873-7820.log`.
- TDD RED: `python3 scripts/vc6-object-notimplemented-c89.test.py cpython/Objects/object.c cpython/Include/cpython/object.h` — exit 1; the new assertion failed as expected because `_PyTypes_FiniTypes` lacked entry `Py_ssize_t i`.
- GREEN plus directly applicable object regressions: the focused NotImplemented/object checks, object C89, FunctionStr, InitState, RichCompare, descrobject/classmethod/dispatch, and genericaliasobject scripts passed (exit 0). Independent rerun of NotImplemented, object C89, InitState, FunctionStr, RichCompare and descrobject checks — exit 0. RED/GREEN and focused-suite transcript: `/tmp/vc6-finitypes-tdd.log`, `/tmp/vc6-finitypes-checks.log`.
- Applicable suite: `bash scripts/vc6-probe-pythoncore-frontier.test.sh` — exit 1. The new object regression and most checks pass; two known unrelated failures persist: console type lookup/cleanup ordering and numeric dispatch (`ValueError: substring not found`). Captured rerun: `build/cron-current/regression-suite.log`.
- Post-change forced-fresh probe (same command) — exit 2; `total=101 compiled=100 cached=0 skipped=0`. `object.c` now compiles past `_PyTypes_FiniTypes`; first blocker advances to `Objects/obmalloc.c(89)`, C2059 on `.` in a designated initializer. Following diagnostics include distinct C89 declarations and related cascades; untouched. Log: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1791178483-168873-7360.log`.
- Scoped outer/nested `git diff --check` — exit 0. CPython tag and commit remain unchanged.

Files changed in this slice: `cpython/Objects/object.c`, `scripts/vc6-object-notimplemented-c89.test.py`, and this log. This is compiler-probe progress only; no `pythoncore.dll`/`python.exe` link, Wine interpreter execution, or real Windows 98 SE execution is claimed. Next frontier: fresh forced probe before edits, then a single TDD slice addressing only the first stable `obmalloc.c(89)` designated-initializer error. Existing suite failures and all earlier local work remain preserved.

---

## Previous latest revision (_PyTypes_InitTypes loop counter made C89-compatible; frontier advances)

Date: 2026-10-05 UTC

Read `PORT_STATUS.md`, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved all existing outer and detached CPython work. No reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. CPython baseline remains tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Existing dirty state was retained.

Re-ran a forced-fresh MSVC600/Wine source-list probe before editing because the previous recorded frontier might be stale. `_blake2/blake2s_impl.c` compiled; the actual first blocker was no longer the recorded `PyStatus` declaration. `Objects/object.c` produced C2143/C2065 on the C99 loop declaration in `_PyTypes_InitTypes()` at line 2060, followed by a separate C99 loop declaration in `_PyTypes_FiniTypes()` at line 2091. Used one focused Codex CLI lane (`codex-cli 0.153.4`, workspace-write; session `01a10a11-ceb3-73f1-b38b-42541af4a989`) for a strict TDD slice. It first extended `scripts/vc6-object-notimplemented-c89.test.py` and verified RED against the original source. Then it hoisted only `size_t i;` to `_PyTypes_InitTypes()`'s entry declaration group and changed that loop to use `i`; loop bounds, body, and earlier legacy type initialization order are preserved. `_PyTypes_FiniTypes()` was not edited.

The existing `scripts/vc6-descrobject-classmethod-c89.test.py` also asserted the old `_PyTypes_InitTypes()` loop spelling. Updated only that assertion to require the entry declaration and C89 loop spelling/order, so the directly applicable regression remains valid after this slice.

Exact verification:

- Before-change forced-fresh probe: `XDG_RUNTIME_DIR=/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x/build/cron-current/runtime WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2; `total=100 compiled=99 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First stable errors C2143/C2065 at `object.c(2060)` for `for (size_t i=...)`; a separate loop declaration produced C2143/C2065 at line 2091. Full log: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1791170011-133815-15b0.log`.
- TDD RED: `python3 scripts/vc6-object-notimplemented-c89.test.py cpython/Objects/object.c cpython/Include/cpython/object.h` — exit 1 with the expected assertion `_PyTypes_InitTypes must declare size_t i before the interpreter guard`.
- GREEN: same command after source edit — exit 0; NotImplemented's 36 positional slots and the new init-loop declaration/order checks passed.
- Focused object regressions: NotImplemented, object C89, object FunctionStr, object initstate, object richcompare, classobject type initialization, descrobject classmethod/dispatch, and genericaliasobject scripts — all exit 0. In particular, the formerly stale descrobject test passes against the updated source.
- Applicable suite: `bash scripts/vc6-probe-pythoncore-frontier.test.sh` — exit 1. The descrobject type-initialization check now passes. Two known unrelated failures remain: console type lookup/cleanup-order check and numeric-dispatch check (`ValueError: substring not found`); other reported checks passed.
- Post-change forced-fresh probe (same command as before-change probe) — exit 2; `total=100 compiled=99 cached=0 skipped=0`. The former line-2060 diagnostics are gone; `object.c` now reaches the distinct `_PyTypes_FiniTypes()` loop at line 2091, reported C2143/C2065 on `Py_ssize_t i`, with dependent diagnostics for `type`. Full log: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1791170515-133815-d60.log`.
- `git -C cpython diff --check -- Objects/object.c` and outer `git diff --check -- scripts/vc6-object-notimplemented-c89.test.py scripts/vc6-descrobject-classmethod-c89.test.py` — exit 0. CPython baseline tag/commit unchanged.

Files changed in this slice: `cpython/Objects/object.c`, `scripts/vc6-object-notimplemented-c89.test.py`, `scripts/vc6-descrobject-classmethod-c89.test.py`, and this status log. This is compiler-probe progress only. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is claimed. Next frontier: fresh forced probe before edits; then address only `_PyTypes_FiniTypes()`'s C99 loop declaration, preserving reverse deallocation order and the rest of the function.

---

## Previous revision (NotImplemented number slot positional initializer; VC6 frontier advances)

Date: 2026-10-04 UTC

Read `PORT_STATUS.md`, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved all pre-existing outer and detached CPython work; no reset, clean, stash, discard, commit, push, or compatibility-patch regeneration. Baseline remains CPython tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Initial dirty state included `PORT_STATUS.md`, existing object regression scripts, extensive nested CPython edits, and existing untracked files; these were retained. The external coding-agent delegation API was unavailable (`anthropic` package missing; lazy installs disabled), so one focused Codex CLI lane (`codex-cli 0.153.4`, workspace-write; session `01a1091f-9e57-7953-8495-1504b1a42b03`) performed the narrow implementation slice. No commit or push.

Fresh forced-fresh MSVC600/Wine source-list probe reconfirmed `_blake2/blake2s_impl.c` compiles, but the recorded `_PyObject_GetMethod` frontier was stale. The actual first blocker was C2059 syntax error `'.'` at `cpython/Objects/object.c(1815)`, the C99 designated initializer `.nb_bool = notimplemented_bool` in `notimplemented_as_number`. Verified `PyNumberMethods` field order from `cpython/Include/cpython/object.h`: 36 slots, `nb_bool` is slot 10. Added new focused regression `scripts/vc6-object-notimplemented-c89.test.py`, first ran it RED against the designated initializer, then replaced only that initializer with 36 explicit positional entries; `nb_bool` keeps `notimplemented_bool`, all other slots are zero. This test checks field order and every value against the CPython header.

Exact verification:

- Initial forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/cron-current/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2, `total=100 compiled=99 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First diagnostic: C2059 at `object.c(1815)` on `.`. Log: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1791154112-60826-2b0.log`.
- TDD RED: `python3 scripts/vc6-object-notimplemented-c89.test.py cpython/Objects/object.c cpython/Include/cpython/object.h` — exit 1, expected assertion `notimplemented_as_number must use a VC6-compatible positional initializer`.
- TDD GREEN and focused object regressions: `python3 scripts/vc6-object-notimplemented-c89.test.py cpython/Objects/object.c cpython/Include/cpython/object.h && python3 scripts/vc6-object-richcompare-c89.test.py cpython/Objects/object.c && python3 scripts/vc6-object-c89.test.py cpython/Objects/object.c && python3 scripts/vc6-object-functionstr-c89.test.py cpython/Objects/object.c` — exit 0; all object checks passed, including validation of the 36 header-ordered slots.
- Applicable regression harness: `bash scripts/vc6-probe-pythoncore-frontier.test.sh` — exit 1; the known unrelated console type-detection/cleanup-order assertion and numeric-dispatch check (`ValueError: substring not found`) remain failing. Numerous other checks passed; no suite-wide pass claimed.
- Post-change forced-fresh VC6 probe (same command as initial probe) — exit 2, `total=100 compiled=99 cached=0 skipped=0`. The former C2059 at line 1815 is gone and no designated-initializer diagnostic remains. The first remaining errors are C2275/C2146/C2065 at `object.c(1906)` for late `PyStatus status`; subsequent loop-declaration errors at lines 2058 and 2089 are separate and untouched. Log: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1791154525-60826-b00.log`.
- Codex lane preservation snapshot confirmed only the designated initializer changed within `object.c` and all 124 other pre-existing dirty/untracked files were unchanged during its edit. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is claimed.

Files changed in this slice: `cpython/Objects/object.c`, new `scripts/vc6-object-notimplemented-c89.test.py`, and this status entry. This is compiler-probe progress only. Next frontier: perform a fresh forced-fresh probe before touching the late `PyStatus status` declaration around line 1906; use TDD for that single declaration family and preserve subsequent loop diagnostics separately.

---

## Previous revision (_PyObject_GetMethod ordinary-dict attr declaration reused; VC6 retry blocked by Wine runtime)

Date: 2026-10-04 20:46 UTC

Read `PORT_STATUS.md`, `README.md`, and the invoked CPython Win9x/MSVC6 reference guidance before acting. The named reference file was not found in the repository. Preserved all existing outer and detached CPython edits; no reset, clean, stash, discard, commit, push, or compatibility-patch regeneration. CPython baseline remains tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Initial dirty state included `PORT_STATUS.md`, object regression scripts, and extensive nested CPython source changes; these were retained.

The recorded `_PyObject_GetMethod` ordinary-dict `PyObject *attr` frontier was confirmed by a successful forced-fresh VC6/Wine source-list probe immediately before implementation: 99/100 TUs compiled, including `_blake2/blake2s_impl.c`, and the first compiler diagnostic was C2275 at `Objects/object.c(1231)`. A focused Codex CLI lane (`codex-cli 0.153.4`, workspace-write; session `01a108aa-4298-7190-ae47-64878df51251`) followed test-first procedure. Extended the existing untracked `scripts/vc6-object-richcompare-c89.test.py`; it failed RED against the current source because the ordinary-dict branch redeclared `PyObject *attr`. Then changed only that declaration to assignment reusing the function-entry `attr` local already used in the mutually exclusive managed-dict branch. The lookup remains after `Py_INCREF(dict)`; dictionary lookup, result assignment, decref/error cleanup, and branch order are unchanged. No other production source changed in this slice.

Exact verification:

- Before-edit forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/cron-current/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2, `total=100 compiled=99 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled; first stable error C2275 at `object.c(1231)`. Full output: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1791146440-32913-5a70.log`.
- TDD RED: `python3 scripts/vc6-object-richcompare-c89.test.py cpython/Objects/object.c` — exit 1, expected assertion detecting duplicate ordinary-dict attr declaration. GREEN after source edit — exit 0; all object-richcompare script assertions passed.
- Focused regressions `python3 scripts/vc6-object-c89.test.py cpython/Objects/object.c`, `python3 scripts/vc6-object-functionstr-c89.test.py cpython/Objects/object.c`, `python3 scripts/vc6-classobject-typeinit.test.py cpython/Objects/classobject.c cpython/Objects/object.c`, `python3 scripts/vc6-descrobject-classmethod-c89.test.py cpython/Objects/descrobject.c cpython/Objects/object.c`, and `python3 scripts/vc6-genericaliasobject-c89.test.py cpython/Objects/genericaliasobject.c cpython/Objects/object.c` — all exit 0.
- Applicable regression harness: `bash scripts/vc6-probe-pythoncore-frontier.test.sh > /tmp/vc6-ordinary-attr-suite.log 2>&1` — exit 1; 260 checks passed, two known unrelated failures remain (console type-detection order and numeric-dispatch helper `ValueError: substring not found`).
- Requested post-change forced-fresh probe (same exact command as the initial probe) — exit 1 before compiler startup: `sock_init: ERROR in sock_check_pollhup()` and `wineserver: error creating /run/user/1000/wine/server-801-136fb0/lock: Read-only file system`. The harness consequently reported `first compile blocker: cpython/Modules/getpath.c`, `total=1 compiled=0 cached=0 skipped=0`; this is a Wine startup failure, not a C diagnostic. No post-change compiler frontier is verified. Full attempt output is in the terminal capture `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1791146737-32913-fc0.log`.
- No post-change VC6 probe success, linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is claimed. Next: resolve writable Wine server runtime placement and repeat a forced-fresh probe before advancing to any later `object.c` errors (1815, 1871+, 2023+).

Files changed in this slice: `cpython/Objects/object.c`, `scripts/vc6-object-richcompare-c89.test.py`, and this status entry. The compatibility patch was not regenerated. No commit or push.

---

## Previous latest revision (_PyObject_GetMethod managed-dict attr declaration hoisted; frontier advances)

Date: 2026-10-04 18:27 UTC

Read `PORT_STATUS.md`, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved all existing dirty outer and detached CPython changes; no reset, clean, stash, discard, commit, push, compatibility-patch regeneration, or publication. CPython baseline remains tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`.

Re-probed the recorded frontier before editing. The status was current: forced-fresh VC6/Wine source-list compile reached `Objects/object.c`; `_blake2/blake2s_impl.c` compiled. The first errors were C2143/C2065 on the late managed-dict `PyObject *attr` at `object.c(1218-1219)`. Used one focused Codex CLI coding lane (`codex-cli 0.153.4`, workspace-write; session `01a10830-7a50-7612-b781-30c767c972df`) for a strict TDD slice. Extended only the already-untracked `scripts/vc6-object-richcompare-c89.test.py`; the focused test failed RED before touching production source. Then hoisted only the managed-dict `attr` declaration into `_PyObject_GetMethod()`'s opening local declarations, changing its late initialized declaration to an assignment at the same lookup point. The separate ordinary-dict branch's `attr` was not touched. Lookup, branch, result assignment, error handling, and cleanup order remain asserted unchanged.

Exact verification:

- Initial forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/cron-recheck/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2; `total=100 compiled=99 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First blocker: C2143 at `object.c(1218)` before `type`, then C2065 `attr` at line 1219; following diagnostics were separate. Full output: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1791138459-4193614-50.log`.
- TDD RED: `python3 scripts/vc6-object-richcompare-c89.test.py cpython/Objects/object.c` — exit 1, expected assertion `_PyObject_GetMethod must declare attr exactly once without initializer at function entry`; all prior object assertions passed.
- TDD GREEN and independent focused regression rerun: `python3 scripts/vc6-object-richcompare-c89.test.py cpython/Objects/object.c && python3 scripts/vc6-object-c89.test.py cpython/Objects/object.c && python3 scripts/vc6-object-functionstr-c89.test.py cpython/Objects/object.c` — exit 0; all object richcompare/attribute/managed-dict checks, object C89 checks, and FunctionStr checks passed.
- Forced-fresh post-change probe: `XDG_RUNTIME_DIR="$PWD/build/cron-recheck/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2; `total=100 compiled=99 cached=0 skipped=0`. The former attr diagnostics at lines 1218-1219 are gone; `object.c` remains first failing translation unit, with its first remaining diagnostic C2275 at line 1231 for a separate late `PyObject` declaration in the ordinary-dict branch. Later C2059 at 1815, PyStatus/C89 failures at 1871+, and loop declaration failures at 2023+ remain distinct and untouched. Full output: `build/cron-recheck/post-attr-probe.log`.
- `git diff --check -- scripts/vc6-object-richcompare-c89.test.py` and `git -C cpython diff --check -- Objects/object.c` — exit 0.

Files changed in this slice: `cpython/Objects/object.c`, `scripts/vc6-object-richcompare-c89.test.py`, and this status entry. Compile-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution. Next frontier: freshly probe before any new edits; then TDD one declaration family only, beginning with the ordinary-dict late `PyObject *attr` at `object.c(1231)`. Keep the later independent blockers separate.

---

## Previous latest revision (fresh VC6 frontier recheck; implementation delegated lane unavailable)

Date: 2026-10-04 UTC

Read `PORT_STATUS.md`, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved the dirty outer worktree and detached CPython source; no reset, clean, stash, discard, commit, push, or publication. The CPython checkout remains exactly at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`.

Re-probed before editing because the recorded frontier might be stale. The recorded `_PyObject_GetMethod` state remains accurate: `_blake2/blake2s_impl.c` compiles, and the first stable blocker is the late `PyObject *attr` declaration at `Objects/object.c(1218)`. The preceding `PyDictValues *values` diagnostic is cleared. A focused coding subagent was requested for this single implementation slice, but delegation failed because the Anthropic Python package is unavailable and lazy installs are disabled. Per the safe-stop constraint for this run, made no production or test edits; this is diagnostics-only.

Exact verification:

- `git status --short --branch` (outer) — exit 0; pre-existing dirty state includes `PORT_STATUS.md`, `scripts/vc6-object-c89.test.py`, and untracked object regression scripts. No unrelated status entries were overwritten.
- `git status --short --branch && git describe --tags --exact-match HEAD && git rev-parse HEAD` (nested CPython) — exit 0; detached checkout at `v3.11.16`, `41388c9cb160d0886d5ca00d2e6c878260a8a4549`; numerous pre-existing nested modifications retained.
- Forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/current-recheck/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2, `total=100 compiled=99 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First diagnostics: C2143 at `object.c(1218)` before type and C2065 `attr` at line 1219. Full log: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1791130887-4170883-4b00.log`.
- Delegation attempt for exactly one `_PyObject_GetMethod` `attr` declaration slice — unavailable: `anthropic` package missing; lazy installs disabled. No child implementation was applied.

No tests were changed or run, and no source change was made. This is compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution. Next frontier remains the single late `PyObject *attr` declaration at `object.c(1218)`; retry a focused coding lane when available, then perform RED/GREEN, applicable regressions, and a fresh forced probe. Keep later diagnostics (including the separate declaration near line 1230) separate.

---

## Latest revision (_PyObject_GetMethod values declaration hoisted; object.c frontier advances)

Date: 2026-10-04 UTC

Read `PORT_STATUS.md`, `README.md`, and the CPython Win9x/MSVC6 reference before acting. Preserved all existing outer and detached CPython changes; no reset, clean, stash, discard, commit, push, compatibility-patch regeneration, or publication. Baseline remains tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Attempted the required focused coding-agent delegation, but it was unavailable because the Anthropic package is missing and lazy installs are disabled; Codex CLI 0.153.4 is installed, but no external CLI lane was started. Proceeded with one narrowly scoped direct TDD slice.

A forced-fresh VC6/Wine re-probe confirmed the recorded object.c frontier. `_blake2/blake2s_impl.c` compiled; first blocker was the late `PyDictValues *values` declaration in `_PyObject_GetMethod()` at `object.c(1213)`. Extended the existing untracked `scripts/vc6-object-richcompare-c89.test.py` with a declaration/order assertion and observed RED (exit 1: missing function-entry `values`). Hoisted only `PyDictValues *values` beside the existing entry locals. The assignment remains in the original managed-dict condition; descriptor lookup, condition evaluation, and branch order are unchanged. No other production source was changed.

Exact verification:

- Initial forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/current-recheck/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2, `total=100 compiled=99 cached=0 skipped=0`. First diagnostics C2275/C2065 at `object.c(1213)` for late `PyDictValues *values`. Log: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1791122912-4136178-3100.log`.
- Focused TDD RED: `python3 scripts/vc6-object-richcompare-c89.test.py cpython/Objects/object.c` — exit 1, expected assertion that `_PyObject_GetMethod` declares `values` at function entry.
- GREEN and focused object regressions: `python3 scripts/vc6-object-richcompare-c89.test.py cpython/Objects/object.c && python3 scripts/vc6-object-c89.test.py cpython/Objects/object.c && python3 scripts/vc6-object-functionstr-c89.test.py cpython/Objects/object.c` — exit 0; all checks passed, including declaration and managed-dict lookup order.
- Applicable harness: `MSVC600_ROOT=/dev/null bash scripts/vc6-probe-pythoncore-frontier.test.sh` — exit 1; live integration intentionally skipped. New object assertion passes. Known unrelated console lookup/cleanup assertion and numeric dispatch (`ValueError: substring not found`) still fail.
- Forced-fresh post-change VC6/Wine probe (same command as initial) — exit 2, `total=100 compiled=99 cached=0 skipped=0`. Former values diagnostics at line 1213 are gone; first errors now C2143/C2065 at lines 1218-1219 for the separate late `PyObject *attr`, followed by independent later diagnostics. Log: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1791123296-4136178-b950.log`.
- `git -C cpython diff --check -- Objects/object.c` and `git diff --check -- scripts/vc6-object-richcompare-c89.test.py` — exit 0. Baseline tag/commit unchanged.

Files changed in this slice: `cpython/Objects/object.c`, `scripts/vc6-object-richcompare-c89.test.py`, and this status entry; all unrelated local changes preserved. Compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution. Next frontier: fresh probe, then test-first address only the first late `PyObject *attr` declaration at `object.c(1218)`; leave subsequent declaration families separate.

---

Date: 2026-10-04 UTC

Read `PORT_STATUS.md`, `README.md`, and the CPython Win9x/MSVC6 reference before acting. Preserved all pre-existing outer and detached CPython work; no reset, clean, stash, discard, commit, push, compatibility-patch regeneration, or publication. CPython remains detached at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. The referenced legacy-toolchain file was found at `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md`.

Re-probed the status-recorded frontier before editing. The stale `_blake2/blake2s_impl.c` entry point still compiles; the actual first blocker remained `cpython/Objects/object.c` in `_PyObject_GetMethod()`. A focused coding subagent could not be started because the Anthropic package is unavailable and lazy installs are disabled; `codex` CLI was present, but no external coding CLI was invoked. Proceeded with one focused test-first edit directly, preserving all unrelated dirty work.

Added assertions to the already-untracked `scripts/vc6-object-richcompare-c89.test.py`, first observing expected RED for the absent function-entry `descr` and `f` declarations. In `cpython/Objects/object.c`, hoisted only `PyObject *descr` and `descrgetfunc f` into the function-entry declaration group; retained `_PyType_Lookup(tp, name)` and `f = NULL` assignments at their original execution points. No subsequent declarations or other source areas were changed.

Exact verification:

- Forced-fresh pre-change VC6/Wine command: `XDG_RUNTIME_DIR="$PWD/build/current-recheck/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2; `total=100 compiled=99 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First diagnostics: C2275/C2065 at `object.c(1196)` for late `PyObject *descr`; C2275/C2146/C2065 at `(1197)` for late `descrgetfunc f`. Full log: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1791114989-4103247-f820.log`.
- TDD RED: `python3 scripts/vc6-object-richcompare-c89.test.py cpython/Objects/object.c` — exit 1 with the intended missing function-entry `descr`/`f` assertion. A preliminary test-regex iteration failed to locate the function (also exit 1); corrected the test itself before the expected RED. No production source was changed before the expected RED.
- GREEN/focused regressions: `python3 scripts/vc6-object-richcompare-c89.test.py cpython/Objects/object.c && python3 scripts/vc6-object-c89.test.py cpython/Objects/object.c && python3 scripts/vc6-object-functionstr-c89.test.py cpython/Objects/object.c` — exit 0; all object C89/order assertions passed.
- Applicable full harness: `bash scripts/vc6-probe-pythoncore-frontier.test.sh` — exit 1. New object assertions passed. Known unrelated console type lookup/cleanup-order assertion still fails, as does numeric dispatch (`ValueError: substring not found`). No unrelated fixes attempted.
- Forced-fresh post-change probe (same command) — exit 2; `total=100 compiled=99 cached=0 skipped=0`. Former diagnostics at object.c(1196-1197) are gone. Next first errors are C2275/C2065 at `object.c(1213)` for late `PyDictValues *values`; later C2143/C2065 at lines 1218-1219 concern another late declaration. Full log: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1791115333-4103247-3ce0.log`.
- Scoped nested `git diff --check -- Objects/object.c` and outer `git diff --check -- scripts/vc6-object-richcompare-c89.test.py` — exit 0. CPython baseline tag and commit verified unchanged.

Files changed in this slice: `cpython/Objects/object.c`, `scripts/vc6-object-richcompare-c89.test.py`, and `PORT_STATUS.md`. Compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution. Next frontier: fresh re-probe, then test-first inspect only the late `PyDictValues *values` declaration at `object.c(1213)`; leave the later `attr` and other diagnostics for separate slices.

---

## Latest revision (_PyObject_GetMethod C89 local hoisted; object.c frontier advances)

Date: 2026-10-04 UTC

Read `PORT_STATUS.md`, `README.md`, and the invoked legacy-toolchain guidance before acting. The referenced on-disk `python-3-win9x-msvc6.md` was absent from both the active profile reference directory and repository search. Preserved all existing outer and detached CPython work; no reset, clean, stash, discard, commit, push, compatibility-patch regeneration, or publication. Baseline remains tag `v3.11.16`, detached commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`.

The recorded object.c frontier remained current on a forced-fresh VC6/Wine source-list probe. `_blake2/blake2s_impl.c` compiled; first stable diagnostic was C2143 at `Objects/object.c(1183)` on the late `PyTypeObject *tp = Py_TYPE(obj)` in `_PyObject_GetMethod`. Coding-agent subagent dispatch was attempted but unavailable because the runtime lacks the `anthropic` package and lazy installs are disabled. Proceeded with a single narrowly scoped test-first edit directly; no external coding CLI was run.

Added an assertion to the existing untracked `scripts/vc6-object-richcompare-c89.test.py`, first ran it against the original source and observed expected RED (exit 1: `_PyObject_GetMethod must declare tp exactly once without initializer at entry`; all four existing object checks passed). Then moved only `PyTypeObject *tp` to the function-entry declaration group and changed its initializer to `tp = Py_TYPE(obj);` at the same original execution point. Assertion, type readiness check, subsequent dispatch, and cleanup order are unchanged.

Exact verification:

- Forced-fresh pre-change: `XDG_RUNTIME_DIR="$PWD/build/current-recheck/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2; `total=100 compiled=99 cached=0 skipped=0`. First stable diagnostic C2143 at `object.c(1183)` before `type`, followed by dependent C2065 `tp` and later separate C89 diagnostics. Full log: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1791107101-4071333-8770.log`.
- Focused regression RED before production edit: `python3 scripts/vc6-object-richcompare-c89.test.py cpython/Objects/object.c` — exit 1, expected missing function-entry `tp` declaration.
- Focused regression GREEN after edit: same command — exit 0; richcompare, exception-context, `PyObject_GetAttr`, `_PyObject_GetDictPtr`, and `_PyObject_GetMethod` ordering assertions all passed.
- Applicable regression harness: `bash scripts/vc6-probe-pythoncore-frontier.test.sh` — exit 1. The object checks, including the new assertion, pass. Existing unrelated console type lookup/cleanup order assertion and numeric dispatch (`ValueError: substring not found`) remain failing; no unrelated changes attempted.
- Forced-fresh post-change probe (same command as above) — exit 2; `total=100 compiled=99 cached=0 skipped=0`. The former line-1183 diagnostic is gone. First remaining diagnostics are C2275/C2065 at `object.c(1196)` for late `PyObject *descr`, followed by C2275/C2146/C2065 at line 1197 for `descrgetfunc f`; later diagnostics remain separate. Full log: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1791107440-4071333-a520.log`.
- CPython baseline tag/commit checked before editing; no compatibility patch regeneration. No commit or push.

Files changed this slice: `cpython/Objects/object.c`, `scripts/vc6-object-richcompare-c89.test.py`, and this status entry. Compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution. Next: re-probe before editing, then test-first handle only the first late-local family at `object.c(1196)`; separate the `descrgetfunc f` declaration and subsequent issues.

---

## Latest revision (_PyObject_GetDictPtr C89 locals hoisted; object.c frontier advances)

Date: 2026-10-04 UTC

Read `PORT_STATUS.md`, `README.md`, and the legacy-toolchain reference before acting. Preserved all pre-existing outer and detached CPython changes; no reset, clean, stash, discard, commit, push, compatibility-patch regeneration, or publication. CPython remains detached at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`.

The recorded `_PyObject_GetDictPtr` frontier remained current on a forced-fresh VC6/Wine probe. One focused Codex CLI lane (0.153.4, workspace-write) extended the existing untracked `scripts/vc6-object-richcompare-c89.test.py`; the new check failed RED as expected before production changes. Hoisted only `PyObject **dict_ptr`, `PyDictValues **values_ptr`, and `PyObject *dict` to the function-entry declarations in `cpython/Objects/object.c`; assignments remain at their original points. The managed-dict branch, pointer initialization and NULL path, conversion/error-clear behavior, and values/dict store order are unchanged. No neighboring functions were modified in this slice.

Exact verification:

- Forced-fresh pre-change probe: `XDG_RUNTIME_DIR="$PWD/build/current-recheck/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2; `total=100 compiled=99 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First diagnostics were C2275/C2065 at `object.c(1124-1125)` for late `dict_ptr` and `values_ptr`, followed by dependent errors. Full log: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1791099148-4038166-9d0.log`.
- TDD RED: `python3 scripts/vc6-object-richcompare-c89.test.py cpython/Objects/object.c` — exit 1, expected missing function-entry declarations; preceding richcompare/exception/attribute checks passed.
- GREEN: same focused command — exit 0; all checks passed, including the new exact `_PyObject_GetDictPtr` statement-order assertion. `scripts/vc6-object-c89.test.py` and `scripts/vc6-object-functionstr-c89.test.py` also passed before the slice; the agent ran the focused richcompare script after the change.
- Applicable regression harness: `bash scripts/vc6-probe-pythoncore-frontier.test.sh` — exit 1. The new object assertion and core object checks pass. Existing unrelated failures remain: console type lookup/cleanup order and numeric dispatch (`ValueError: substring not found`). No unrelated fixes attempted.
- Forced-fresh post-change probe (same command) — exit 2; `total=100 compiled=99 cached=0 skipped=0`. Prior diagnostics at object.c(1124-1125) are gone; `_PyObject_GetDictPtr` now compiles through. The next first blocker is C2143 at `object.c(1183)` before `type` in a separate function, followed by dependent errors there. Full log: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1791099505-4038166-22c0.log`.
- `git diff --check -- scripts/vc6-object-richcompare-c89.test.py` and `git -C cpython diff --check -- Objects/object.c` — exit 0. Baseline tag/commit verified unchanged. No compatibility patch regeneration.

Files changed by this slice: `cpython/Objects/object.c`, `scripts/vc6-object-richcompare-c89.test.py`, and this status entry; prior local changes remain. This is compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution. Next frontier: re-probe before further edits, then test-first inspect only the C2143 declaration at `object.c(1183)`; keep subsequent diagnostics separate.

---

## Previous revision (_PyObject_DictPointer size declaration hoisted; object.c frontier advances)

Date: 2026-10-04 UTC

Read `PORT_STATUS.md`, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved all prior work; no reset, clean, stash, discard, commit, push, compatibility-patch regeneration, or publication. CPython remains detached at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`.

Re-probed the recorded object.c frontier with forced-fresh VC6/Wine source-list compile. `_blake2/blake2s_impl.c` compiled. First error family remained late `size_t size` in `_PyObject_DictPointer()` at line 1100. One focused Codex CLI lane (0.153.4, workspace-write) extended `scripts/vc6-object-c89.test.py`, observed expected RED, then hoisted only `size_t size;` to the start of the existing negative-offset block and changed the original declaration/initializer to `size = _PyObject_VAR_SIZE(tp, tsize);`. Expression, assertion, offset adjustment, and return order are preserved. No adjacent source errors were changed.

Exact verification:

- Forced-fresh pre-change probe: `XDG_RUNTIME_DIR="$PWD/build/current-recheck/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2; `total=100 compiled=99 cached=0 skipped=0`. First diagnostics C2275/C2146/C2065 at `object.c(1100)` for late `size_t size`. Full log: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1791091193-4004215-b950.log`.
- TDD RED: `python3 scripts/vc6-object-c89.test.py cpython/Objects/object.c` — exit 1, expected `_PyObject_DictPointer` declaration/order assertion; the preceding three object checks passed.
- GREEN: same command — exit 0; all four object checks passed. `python3 scripts/vc6-object-functionstr-c89.test.py cpython/Objects/object.c` and `python3 scripts/vc6-object-richcompare-c89.test.py cpython/Objects/object.c` — exit 0.
- Applicable regression harness: `bash scripts/vc6-probe-pythoncore-frontier.test.sh > /tmp/vc6-dictpointer-frontier-test.log 2>&1` — exit 1. The new assertion and object checks pass. Existing unrelated failures remain: console type lookup/cleanup order and numeric dispatch (`ValueError: substring not found`). Full log: `/tmp/vc6-dictpointer-frontier-test.log`.
- Forced-fresh post-change probe (same command) — exit 2; `total=100 compiled=99 cached=0 skipped=0`. Former diagnostics at line 1100 are gone. First blocker advances to C2275/C2065 at line 1124 (`PyObject *dict_ptr`) in `_PyObject_GetDictPtr`; following diagnostics are separate. Full log: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1791091612-4004215-640.log`.
- `git diff --check` and `git -C cpython diff --check` — exit 0. The source diff is limited to the one intended declaration/assignment conversion; CPython baseline unchanged.

Files changed by this slice: `cpython/Objects/object.c`, `scripts/vc6-object-c89.test.py`, and this status entry. Compile-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or actual Windows 98 execution. Next frontier: test-first address only the late declarations at `object.c(1124)` in `_PyObject_GetDictPtr`; treat later diagnostics separately.

---

## Previous latest revision (PyObject_GetAttr result declaration hoisted; object.c frontier advances)

Date: 2026-10-04 03:18 UTC

Read `PORT_STATUS.md`, `README.md`, and the CPython/Win9x/MSVC6 reference before acting. Preserved all existing outer and nested changes; no reset, clean, stash, discard, commit, push, compatibility-patch regeneration, or publication. Verified CPython remains detached at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`.

The recorded object.c frontier was freshly confirmed with a forced VC6/Wine source-list probe. `_blake2/blake2s_impl.c` compiled, and `PyObject_GetAttr()` at `Objects/object.c(935)` was the first blocker. One focused coding CLI lane (Codex CLI 0.153.4, workspace-write) performed a TDD slice: extended the pre-existing untracked `scripts/vc6-object-richcompare-c89.test.py`, observed RED, then hoisted only `PyObject *result` to the function declarations and changed its former late initialized declaration to `result = NULL;` after name validation. Dispatch, validation, error-context, and return order are unchanged. No other production source was modified in this slice.

Exact verification:

- Forced-fresh pre-change probe: `XDG_RUNTIME_DIR="$PWD/build/current-recheck/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2; `total=100 compiled=99 cached=0 skipped=0`. First errors: C2275/C2065 at `object.c(935)` for late `PyObject *result`; subsequent stable blocker was `size_t size` at line 1099. Full log: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1791083254-3970565-ed70.log`.
- TDD RED: `python3 scripts/vc6-object-richcompare-c89.test.py cpython/Objects/object.c` — exit 1; prior richcompare and `set_attribute_error_context` checks passed, new assertion failed because `result` was not declared at function entry.
- GREEN plus focused object regressions: `python3 scripts/vc6-object-richcompare-c89.test.py cpython/Objects/object.c && python3 scripts/vc6-object-c89.test.py cpython/Objects/object.c && python3 scripts/vc6-object-functionstr-c89.test.py cpython/Objects/object.c` — exit 0; all richcompare, error-context, `PyObject_GetAttr`, object C89, and FunctionStr assertions passed.
- Applicable harness: `MSVC600_ROOT=/dev/null bash scripts/vc6-probe-pythoncore-frontier.test.sh` — exit 1. Live compiler integration intentionally skipped. The new object checks passed; two known unrelated checks still fail: console type lookup/cleanup order, and numeric dispatch (`ValueError: substring not found`). No harness-wide pass claimed.
- Forced-fresh post-change probe (same command as pre-change) — exit 2; `total=100 compiled=99 cached=0 skipped=0`. Former errors at `object.c(935)` are gone. First stable diagnostic is now C2275/C2146/C2065 at `object.c(1100)` for late `size_t size`; later object.c diagnostics are separate. Full log: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1791083629-3970565-5220.log`.
- `git diff --check` and `git -C cpython diff --check` — exit 0. Baseline tag and commit verified unchanged.

Files changed by this slice: `cpython/Objects/object.c`, `scripts/vc6-object-richcompare-c89.test.py`, and this status entry. Compiler-probe progress only; no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution. Next frontier: test-first inspect and address only the late `size_t size` declaration in the function at `object.c(1100)`, preserving original evaluation/order; re-probe before treating the frontier as current.

---

## Previous latest revision (set_attribute_error_context C89 locals hoisted; object.c frontier advances)

Date: 2026-10-04 01:06 UTC

Read `PORT_STATUS.md`, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved all pre-existing outer and nested changes; no reset, clean, stash, discard, commit, push, compatibility-patch regeneration, or publication. CPython remains detached at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`.

Forced-fresh MSVC600/Wine probe reconfirmed the recorded frontier: `_blake2/blake2s_impl.c` compiled, and the first blocker was `Objects/object.c(900)` in `set_attribute_error_context()`. Used one focused Codex CLI lane (`codex-cli 0.153.4`, workspace-write) for this narrow TDD slice. Extended the pre-existing untracked `scripts/vc6-object-richcompare-c89.test.py` without removing its rich-compare check. Hoisted only `type`, `value`, `traceback`, and `PyAttributeErrorObject *the_exc` to the function entry; changed the late `the_exc` initialized declaration to assignment at its original point. Exception check/fetch/normalize/restore, augmentation, and early returns remain in original order. No other new production source change was made in this slice.

Exact verification:

- Initial forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/current-recheck/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2; `total=100 compiled=99 cached=0 skipped=0`. First stable diagnostics: C2275 and C2065 at `object.c(900)` for the late `PyObject *type, *value, *traceback`; C2275/C2065 at line 907 for late `PyAttributeErrorObject *the_exc`. `_blake2/blake2s_impl.c` compiled. Full log: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1791075267-3936276-180.log`.
- TDD RED: `python3 scripts/vc6-object-richcompare-c89.test.py cpython/Objects/object.c` — exit 1 before production edit; existing `PyObject_RichCompare` assertion passed, new assertion failed because the four locals were not at function entry.
- GREEN/focused regressions: `python3 scripts/vc6-object-richcompare-c89.test.py cpython/Objects/object.c && python3 scripts/vc6-object-c89.test.py cpython/Objects/object.c` — exit 0; richcompare and `set_attribute_error_context` checks passed, as did three existing object C89 checks.
- Applicable harness: `MSVC600_ROOT=/dev/null bash scripts/vc6-probe-pythoncore-frontier.test.sh` — exit 1. Live integration explicitly skipped; two known unrelated checks still fail: console type lookup/cleanup order, and numeric dispatch (`ValueError: substring not found`). All other emitted checks passed; no harness-wide pass claimed.
- Post-change forced-fresh probe (same command as initial probe) — exit 2; `total=100 compiled=99 cached=0 skipped=0`. Prior errors at `set_attribute_error_context()` are gone. First stable diagnostic is now `object.c(935)` C2275/C2065 for late `PyObject *result` in `PyObject_GetAttr`; subsequent object.c diagnostics remain separate. Full log: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1791075688-3936276-a060.log`.
- `git -C cpython diff --check -- Objects/object.c` and `git diff --check -- scripts/vc6-object-richcompare-c89.test.py` — exit 0. Baseline tag and commit verified unchanged.

Files changed in this slice: `cpython/Objects/object.c`, `scripts/vc6-object-richcompare-c89.test.py`, and this status entry. This is compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution. Next frontier: test-first address only `PyObject_GetAttr()`'s late `result` declaration at line 935, preserving dispatch and error order; keep later object.c errors separate.

---

## Latest revision (PyObject_RichCompare C89 local hoisted; object.c frontier advances)

Date: 2026-10-03 22:52 UTC

Read `PORT_STATUS.md`, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. CPython remains at detached tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Preserved all existing outer/nested changes; no reset, clean, stash, discard, commit, push, compatibility patch regeneration, or publication.

The prior `PyObject_RichCompare` line-747 frontier was freshly reconfirmed by a forced-fresh source-list compile. One focused Codex CLI lane (`codex-cli 0.153.4`, workspace-write) added a narrow regression and applied one C89 change: declared `PyObject *res` with the function-entry locals and changed the original late initialized declaration to `res = do_richcompare(...)`. Validation, recursive-call entry, leave, and return order are preserved. Independent review confirmed this function-only source diff; no other production source was changed in this slice.

Exact verification:

- Forced-fresh VC6 probe before implementation: `XDG_RUNTIME_DIR="$PWD/build/current-recheck/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2; `total=100 compiled=99 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled; `object.c(747)` first errors C2275 (`PyObject` illegal use as expression) and C2065 (`res` undeclared). Full log: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1791067258-3892466-4770.log`.
- TDD RED: `python3 scripts/vc6-object-richcompare-c89.test.py cpython/Objects/object.c` — exit 1, expected assertion that `res` must be declared once without initializer at entry.
- GREEN and independent focused rerun: same command — exit 0, `object PyObject_RichCompare C89 res declaration and recursive-call/result order: PASS`.
- Applicable suite: `bash scripts/vc6-probe-pythoncore-frontier.test.sh` — exit 1. The test set ran; this slice's source check passed. Two known unrelated failures persist: console type lookup/cleanup ordering and numeric dispatch (`ValueError: substring not found`).
- Forced-fresh post-change probe (same command) — exit 2; `total=100 compiled=99 cached=0 skipped=0`. Former line-747 errors are gone. First stable errors now occur at `object.c(900)` C2275/C2065 for late exception-object declarations in a different function; later `object.c` C89/initializer diagnostics remain distinct. Full log: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1791067716-3892466-4fc0.log`.
- Scoped `git -C cpython diff --check -- Objects/object.c` and `git diff --check -- scripts/vc6-object-richcompare-c89.test.py` — exit 0. CPython remains at the exact baseline tag/commit above.

Files changed by this slice: `cpython/Objects/object.c`, new `scripts/vc6-object-richcompare-c89.test.py`, and this log. Compile-frontier progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution. Next frontier: test-first inspect and address only the late declarations at `object.c(900)`; keep subsequent diagnostics separate.

Read `PORT_STATUS.md`, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. CPython remains at detached tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Preserved all existing outer and nested changes; no reset, clean, stash, discard, commit, push, patch regeneration, or publication.

The `_blake2/blake2s_impl.c` recorded frontier remained stale as expected: forced-fresh VC6 probe compiled it and reached `Objects/object.c`. Addressed exactly the first error family in `_PyObject_FunctionStr`: removed the duplicate late `PyObject *module;` and changed the duplicate late `PyObject *result = NULL;` into `result = NULL;`. This keeps the original initialization point/order and uses the function-entry declarations. One focused Codex CLI lane (`codex-cli 0.153.4`, workspace-write) followed TDD; native delegation was unavailable because the Anthropic package is absent. Independently reviewed its narrow diff.

Exact results:

- Forced-fresh pre-change probe: `XDG_RUNTIME_DIR="$PWD/build/current-recheck/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2; `total=100 compiled=99 cached=0 skipped=0`; first stable errors C2275 at `object.c(620-621)` for the duplicate `module` and `result` declarations. `_blake2/blake2s_impl.c` compiled.
- TDD RED: `python3 scripts/vc6-object-functionstr-c89.test.py cpython/Objects/object.c` — exit 1, expected 2 `module` declarations found.
- GREEN: same test — exit 0, unique declarations and evaluation/statement order pass. Existing `python3 scripts/vc6-object-c89.test.py cpython/Objects/object.c` — exit 0 (three existing checks pass).
- Applicable suite: `MSVC600_ROOT=/tmp/python-win9x-no-toolchain bash scripts/vc6-probe-pythoncore-frontier.test.sh` — exit 1; the active object checks passed; two known unrelated failures remain: console type lookup/cleanup ordering and numeric dispatch (`ValueError: substring not found`). Live compiler integration intentionally skipped in this suite invocation.
- Focused VC6 compile of `Objects/object.c` using the generated response-file include/define configuration — exit 2. Former diagnostics at lines 620-621 are gone. First remaining errors are C2275/C2065 at line 747 in a separate function, followed by distinct later C89 errors. This confirms progress at the compiler frontier; it does not clear the translation unit.

Files changed this run: `cpython/Objects/object.c`, new `scripts/vc6-object-functionstr-c89.test.py`, and `PORT_STATUS.md`. No compatibility patch regeneration. Compile-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution. Next frontier: test-first address only the line-747 C89 declaration in `object.c`, after confirming exact function context; retain later diagnostics as separate blockers.

Read `PORT_STATUS.md`, `README.md`, and the CPython/Win9x/MSVC6 reference before acting. CPython remains at tag `v3.11.16`, detached baseline commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Preserved all pre-existing outer and nested work; no reset, clean, stash, discard, commit, push, patch regeneration, or publication.

The previously mentioned `_blake2/blake2s_impl.c` frontier was stale. Forced-fresh MSVC600 source-list probe reached 99/100 translation units and compiled `_blake2/blake2s_impl.c`; the actual first blocker is `cpython/Objects/object.c`. First stable errors are C2275 for duplicate late `PyObject *module` and `PyObject *result = NULL` at lines 620–621 in `_PyObject_FunctionStr`; both names are already declared at function entry (lines 608–610). Later diagnostics in `object.c` are distinct and were not addressed.

Focused implementation was not retained because Wine failed before invoking `cl.exe`. A test-first candidate reproduced the duplicate declaration (`RED`, expected assertion), and the minimal source edit passed that focused test and the existing object regression, but the actual compiler confirmation could not be obtained. Wine startup failed with `sock_init: ERROR in sock_check_pollhup()` and `wineserver: mkdir /run/user/1000/wine/server-21-59c6: Read-only file system`; retry with a temporary prefix/runtime directory failed identically. The temporary production edit was reverted byte-for-byte. The candidate test was removed rather than leaving an intentionally failing test artifact.

Exact verification:

- Forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/current-recheck/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2; `total=100 compiled=99 cached=0 skipped=0`; first blocker `Objects/object.c`, C2275 at lines 620–621. Full log: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1791051825-3857953-f590.log`.
- TDD candidate regression RED: `python3 scripts/vc6-object-functionstr-c89.test.py cpython/Objects/object.c` — exit 1, expected `module must be declared exactly once`.
- Candidate GREEN (while the temporary fix was present): same command — exit 0. Existing `python3 scripts/vc6-object-c89.test.py cpython/Objects/object.c` — exit 0.
- Focused VC6 compile using `build/vc6-probe-pythoncore-frontier/Objects_object.rsp` — exit 1 before compiler startup due to read-only `/run/user/1000/wine`; no compiler diagnostic beyond the full source-list probe was obtained.
- After reverting the candidate: `object.c` matches its entry snapshot; all 122 snapshotted pre-existing files, including `PORT_STATUS.md`, were verified unchanged before this log update. Nested scoped `git diff --check -- Objects/object.c` passed.

Files changed for this run: `PORT_STATUS.md` only. No production compatibility change is retained. This remains compile-frontier evidence only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or actual Windows 98 SE execution. Next step: restore a Wine server runtime directory that is writable to the wineserver process, then repeat the forced-fresh frontier and address only the first current `object.c` diagnostic with RED/GREEN plus a successful focused VC6 compile.

---

## Previous latest revision (generated compatibility patch refreshed; VC6 frontier in object.c)

CPython baseline: `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`.

The incremental C89/VC6 port now compiles `memoryobject.c`, `methodobject.c`, and `moduleobject.c` directly with VC6. Focused checks cover their declaration, evaluation, allocation, reference, and type-initialization ordering. Additional C89 conversions and focused checks have been added for `object.c`; its direct VC6 compile still fails with 72 diagnostics, many likely cascading from late declarations and remaining C99 constructs. This is compile-only progress; no interpreter link or Windows 98 SE runtime test is verified.

The tracked compatibility patch `compat/msvc600/cpython-3.11.16-vc6-headers.patch` has been regenerated from the full nested CPython working-tree diff and the untracked `Include/internal/pycore_win9x_loadlibrary.h`. A byte-for-byte check confirmed the patch contains all 121 modified/new file diffs. The nested CPython checkout remains detached; its source changes are represented in the root repository by this patch, not by committing the nested checkout.

Next: finish `object.c`, rerun the forced source-list compile frontier and focused regressions, then tackle linking and real Windows 98 SE execution separately. No link/runtime success is claimed.

---

## Latest revision (`PyLong_FromUnsignedLongLong` uses VC6-compatible unsigned type spelling)

Date: 2026-10-03 14:15 UTC

Read `PORT_STATUS.md`, `README.md`, and the invoked legacy-toolchain guidance before work. The on-disk `python-3-win9x-msvc6.md` reference was absent. Preserved all pre-existing outer and detached CPython work; no reset, clean, stash, discard, commit, push, or publication. CPython remains at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549` (the same hash as recorded previously). The prior recorded `_PyLong_FromLarge()` frontier was stale. Forced-fresh MSVC600 `cl.exe` via Wine re-probe confirmed the actual first blocker was C2632 at `Objects/longobject.c(374)` and `(376)`: `unsigned long long` is rejected by VC6 in the `PyLong_FromUnsignedLongLong` definition and `PYLONG_FROM_UINT` instantiation. The compiler probe output did not print a separate compiler version banner.

Used one focused Codex CLI lane (`codex-cli 0.153.4`, workspace-write) for one narrow TDD slice. Extended `scripts/vc6-longobject-c89.test.py`, observed RED against the original spelling, then changed only the function parameter and macro type argument to `unsigned PY_LONG_LONG`. This matches the public declaration in `Include/longobject.h` and the existing VC6 mapping to `__int64` in `PC/pyconfig.h`, preserving unsigned 64-bit intent. No other source declaration or behavior changed. The existing later C89 errors were left untouched.

Exact verification:

- Initial forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/current-recheck/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2, `total=95 compiled=94 cached=0 skipped=0`; first errors C2632 at `longobject.c(374)` and `(376)`, followed by line-407 C89 errors. Log: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1791036400-3732714-7090.log`.
- RED: `python3 scripts/vc6-longobject-c89.test.py cpython/Objects/longobject.c` — exit 1, expected assertion that `PyLong_FromUnsignedLongLong` must use the public/VC6-compatible unsigned `PY_LONG_LONG` spelling.
- GREEN: same focused test — exit 0; all six longobject assertions passed.
- Applicable regression suite: `bash scripts/vc6-probe-pythoncore-frontier.test.sh` — exit 1. The longobject checks and other applicable checks passed; two known unrelated failures remain: console type lookup/cleanup order and numeric dispatch (`ValueError: substring not found`). Log: `/tmp/vc6-longlong-slice/suite.log`.
- Post-change forced-fresh probe (same command) — exit 2, `total=95 compiled=94 cached=0 skipped=0`. The C2632 errors at lines 374/376 are gone; first stable errors now occur at line 407 in `PyLong_FromDouble()` (C2275/C2065 on late `PyLongObject *v`, followed by C89 declaration errors). Later independent long-long/CRT diagnostics remain. Log: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1791036840-3732714-b110.log`.
- `git -C cpython diff --check -- Objects/longobject.c` and `git diff --check -- scripts/vc6-longobject-c89.test.py` — exit 0. Preservation comparison confirmed only this source and focused test changed beyond the pre-run snapshot; `PORT_STATUS.md`, compatibility patch, and all unrelated local changes were preserved.

Files changed by this slice: `cpython/Objects/longobject.c`, `scripts/vc6-longobject-c89.test.py`, and this status entry. This is compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or actual Windows 98 SE execution. Next frontier: test-first address only the first late-local declaration family in `PyLong_FromDouble()` at line 407, preserving all fast-path and validation/evaluation order; keep subsequent long-long/CRT issues separate.

---

## Previous revision (`_PyLong_FromLarge` C89 locals hoisted; frontier advances within longobject)

Date: 2026-10-03 09:47 UTC

Read `PORT_STATUS.md`, `README.md`, and the legacy-toolchain guidance first. The referenced on-disk `python-3-win9x-msvc6.md` file was not found in the active profile or repository; the invoked skill guidance was available. Preserved all pre-existing outer and detached CPython work; no reset, clean, stash, discard, commit, push, or publication. CPython remains at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`.

The recorded `_PyLong_FromLarge()` frontier remained current on forced-fresh probe. Used one focused Codex CLI lane (`codex-cli 0.153.4`, workspace-write) for one narrow TDD slice. Extended `scripts/vc6-longobject-c89.test.py`, observed RED before the source edit, then hoisted only `twodigits abs_ival`, `twodigits t`, `Py_ssize_t ndigits`, `PyLongObject *v`, `digit *p`, and `int sign` to `_PyLong_FromLarge()`'s entry declarations in `cpython/Objects/longobject.c`. Initializers became assignments at their original execution points. Assertions, sign/absolute-value branches, digit-count loop, allocation, initialization, digit-write loop, and return ordering remain unchanged. Independently inspected the nested diff and confirmed only this function changed in the nested CPython slice.

Exact verification:

- Initial forced-fresh compiler probe: `XDG_RUNTIME_DIR="$PWD/build/current-recheck/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2, `total=95 compiled=94 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First errors were C2275/C2146/C2065 on late `twodigits t` at `longobject.c(239)`, followed by late `ndigits` at 240 and `v` at 245. Full log: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1791020452-3685379-2910.log`.
- RED: `python3 scripts/vc6-longobject-c89.test.py cpython/Objects/longobject.c` — exit 1 at the new `_PyLong_FromLarge` assertion; the prior get_small_int, `_PyLong_New`, and `_PyLong_FromMedium` checks passed.
- GREEN: same focused command — exit 0; all four longobject regression checks passed.
- Applicable broad regression: `bash scripts/vc6-probe-pythoncore-frontier.test.sh` — exit 1. Longobject checks and the rest of applicable checks run and pass. Two known unrelated failures remain: console type lookup/cleanup order and numeric dispatch (`ValueError: substring not found`).
- Post-change forced-fresh probe (same command) — exit 2, `total=95 compiled=94 cached=0 skipped=0`. `longobject.c` now compiles past `_PyLong_FromLarge`; first errors advanced to line 364 in `PyLong_FromLong()` (C2275/C2146/C2065 on a late `Py_ssize_t ndigits`, then cascading late `t`, `v`, and `p` declarations). Subsequent diagnostics include independent long-long/CRT blockers. Full log: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1791020810-3685379-5b50.log`.
- `git -C cpython diff --check -- Objects/longobject.c` and `git diff --check -- PORT_STATUS.md scripts/vc6-longobject-c89.test.py` — exit 0.

Files changed by this slice: `cpython/Objects/longobject.c`, `scripts/vc6-longobject-c89.test.py`, and this status entry. Compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or actual Windows 98 SE execution. Next frontier: test-first address only the first `PyLong_FromLong()` declaration family at line 364, retaining its small/medium fast paths and digit-count/allocation order; handle later `long long` and CRT issues separately.

---

## Previous revision (`_PyLong_FromMedium` C89 locals hoisted; frontier advances within longobject)

Date: 2026-10-03 07:39 UTC

Read `PORT_STATUS.md`, `README.md`, and the legacy-toolchain reference before acting. Preserved the existing outer worktree and detached CPython changes; no reset, clean, stash, discard, commit, push, or publication. CPython remains at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. The prior `_PyLong_New()` frontier was freshly rechecked: `_blake2/blake2s_impl.c` compiled, `_PyLong_New()`'s line-156 diagnostic was gone, and the first blocker was `_PyLong_FromMedium()` at line 205.

Used one focused Codex CLI coding lane (`codex-cli 0.153.4`, workspace-write). Strict TDD: extended `scripts/vc6-longobject-c89.test.py` for `_PyLong_FromMedium()` declarations and statement order, observed RED before the production edit, then hoisted only `PyLongObject *v`, `Py_ssize_t sign`, and `digit abs_x` to the opening declaration group in `cpython/Objects/longobject.c`. Assignments remain at their original points; assertions, allocation, NULL/error/return, initialization, digit write, and return order are preserved. The agent made no other changes; independently inspected the narrow diff.

Exact verification:

- Initial forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/current-recheck/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2, `total=95 compiled=94 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First blocker was C2143 at `longobject.c(205)` on the late `PyLongObject *v`; dependent errors included C2065 `v` and late `Py_ssize_t sign` / `digit abs_x`. Full log: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1791012585-3658734-75d0.log`.
- RED: `python3 scripts/vc6-longobject-c89.test.py cpython/Objects/longobject.c` — exit 1, expected assertion that `_PyLong_FromMedium` declarations and order did not match; prior `get_small_int` and `_PyLong_New` checks passed.
- GREEN: same command — exit 0; all three longobject checks passed, including the new `_PyLong_FromMedium` check.
- Applicable regression suite: `bash scripts/vc6-probe-pythoncore-frontier.test.sh` — exit 1. The broad suite ran; this slice's source behavior assertion passed when run directly. Two known unrelated failures remain: console type lookup/cleanup order and numeric dispatch (`ValueError: substring not found`).
- Post-change forced-fresh probe (same command) — exit 2, `total=95 compiled=94 cached=0 skipped=0`. `_PyLong_FromMedium()` passed its former diagnostics. First stable diagnostics now occur in `_PyLong_FromLarge()` at `longobject.c(239)` on late `twodigits t` (C2275/C2146, with C2065 `t`), followed by late `Py_ssize_t ndigits` at line 240 and late `PyLongObject *v` at line 245. Full log: `build/current-recheck/longobject-frommedium-post.log`.
- `git diff --check -- PORT_STATUS.md scripts/vc6-longobject-c89.test.py && git -C cpython diff --check -- Objects/longobject.c` — exit 0.

Files changed by this slice: `cpython/Objects/longobject.c`, `scripts/vc6-longobject-c89.test.py`, and this status entry. This is compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or actual Windows 98 SE execution. Next frontier: test-first hoist only the first `_PyLong_FromLarge()` declaration family in function-entry order, preserving assertions, sign/absolute-value decisions, digit-count loop, allocation, initialization, and digit-write order; keep later `long long`/CRT blockers separate.

---

## Previous revision (_PyLong_New ndigits declaration hoisted; frontier remains longobject)

Date: 2026-10-03 05:16 UTC

Read `PORT_STATUS.md`, `README.md`, and the CPython/Win9x/MSVC6 reference before acting. Preserved existing outer and detached CPython edits; no reset, clean, stash, discard, commit, push, or publication. CPython remains detached at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. The recorded frontier had become stale: forced-fresh VC6 re-probe confirmed `_blake2/blake2s_impl.c` compiles and first blocked at `Objects/longobject.c(156)` inside `_PyLong_New()`.

Applied one narrow test-first C89 slice: hoisted only `Py_ssize_t ndigits` into `_PyLong_New()`'s declaration group; its assignment remains after the overflow check and before allocation. The regression `scripts/vc6-longobject-c89.test.py` now checks the declaration and exact overflow-check, ndigits assignment, allocation, allocation error, initialization, and return order. The native Hermes coding-subagent API could not start because its Anthropic package is absent; used one focused Codex CLI lane (`codex-cli 0.153.4`, workspace-write) and independently checked results. Existing uncommitted `get_small_int()` changes were retained.

Exact verification:

- Initial forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/current-recheck/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2, `total=95 compiled=94 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled; first blocker was C2275/C2146/C2065 at `longobject.c(156)` for late `Py_ssize_t ndigits`. Full output: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1791004605-3636193-e850.log`.
- RED: `python3 scripts/vc6-longobject-c89.test.py cpython/Objects/longobject.c` — exit 1, expected `_PyLong_New` assertion failed; existing `get_small_int` check passed.
- GREEN: same command — exit 0, both `get_small_int` and `_PyLong_New` checks passed.
- Post-change forced-fresh probe (same command) — exit 2, `total=95 compiled=94 cached=0 skipped=0`. The `_PyLong_New()` line-156 diagnostic is gone. First remaining stable diagnostics start at `longobject.c(205)` in `_PyLong_FromMedium()` (C2143 before type and dependent C2065 `v`); later declaration-order and `long long` blockers remain separate. Full output: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1791004999-3636193-ef50.log`.
- Applicable regression command `bash scripts/vc6-probe-pythoncore-frontier.test.sh` — exit 1. The new longobject checks pass when run directly; the full suite still has the two known failures: console type-detection ordering and numeric dispatch (`ValueError: substring not found`).
- `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && git diff --check -- PORT_STATUS.md scripts/vc6-longobject-c89.test.py && git -C cpython diff --check -- Objects/longobject.c` — exit 0.

Files changed by this slice: `cpython/Objects/longobject.c`, `scripts/vc6-longobject-c89.test.py`, and `PORT_STATUS.md`. Compile-frontier evidence only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or actual Windows 98 SE execution. Next frontier: test-first hoist only the first `_PyLong_FromMedium()` declaration family at line 205, preserving allocation/error and initialization order; keep subsequent locals and `long long` issues separate.

Read `PORT_STATUS.md`, `README.md`, and the invoked legacy-toolchain guidance before acting. The referenced on-disk `python-3-win9x-msvc6.md` was not present at either the expected profile skills reference path or in the repository. Preserved every pre-existing outer and detached CPython change; no reset, clean, stash, discard, commit, push, or publication. CPython remains detached at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`.

The status-recorded listobject frontier was stale. A forced-fresh probe confirmed `Objects/listobject.c` and `_blake2/blake2s_impl.c` now compile; first blocker is `Objects/longobject.c`. Applied one narrow C89 slice in `get_small_int()`: moved only `PyObject *v` to the function's declaration group and retained the assertion → small-int lookup assignment → incref → return order. Added `scripts/vc6-longobject-c89.test.py`. Coding subagent dispatch was attempted, but the delegate service failed because the Anthropic Python package is unavailable; proceeded with the minimal test-first edit directly, without a coding CLI.

Exact verification:

- RED: `python3 scripts/vc6-longobject-c89.test.py cpython/Objects/longobject.c` — exit 1 with the expected assertion that `get_small_int` must declare `v` at function entry and preserve evaluation order.
- GREEN: same command — exit 0, `longobject get_small_int C89 declaration and evaluation order: PASS`.
- Applicable shell regression: `bash scripts/vc6-probe-pythoncore-frontier.test.sh` — exit 1. The longobject changes do not introduce suite assertions (no longobject integration existed); the known console-type-detection assertion fails and numeric-dispatch check raises `ValueError: substring not found`. The listobject and other targeted checks pass.
- Initial fresh probe before the slice: `XDG_RUNTIME_DIR="$PWD/build/current-recheck/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2, `total=95 compiled=94 cached=0 skipped=0`. First diagnostics in `longobject.c`: C2143 at line 61 before `type`, C2065 `v`; subsequent errors are distinct declaration-order and `long long`/CRT compatibility issues. Log: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1790996934-3608344-9090.log`.
- Post-change forced fresh probe (same command) — exit 2, `total=95 compiled=94 cached=0 skipped=0`. `get_small_int()`'s prior C2143/C2065 diagnostics are gone; first remaining errors are C2275/C2146/C2065 at `longobject.c(156)` for late `Py_ssize_t ndigits` in `_PyLong_New()`. Later declaration-order and VC6 64-bit type issues remain separate. Log: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1790997084-3608344-5490.log`.
- `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh`, focused/nested/outer scoped `git diff --check` — exit 0.

Files changed by this slice: `cpython/Objects/longobject.c`, `scripts/vc6-longobject-c89.test.py`, and `PORT_STATUS.md`. Compiler-probe progress only: no `pythoncore.dll`/`python.exe` link, Wine interpreter execution, or actual Windows 98 SE execution. Next frontier: test-first hoist only `ndigits` in `_PyLong_New()`, preserving the overflow check and allocation/error sequence.

---

## Latest revision (expanded listobject VC6/C89 fixes; forced recheck in progress)

Date: 2026-10-03 03:05 UTC

Preserved all pre-existing outer and detached CPython changes; no reset, clean, stash, discard, commit, or push. CPython remains on the v3.11.16 baseline.

The last completed forced-fresh probe had advanced past the earlier list-allocation, list-repeat, and powersort-helper blockers, then reported additional C89 violations in `listobject.c` sorting, comparison, vectorcall, extended-slice assignment, type initialization, and iterator-pickling code. Applied declaration/order fixes in those paths and replaced the `PyList_Type.tp_vectorcall` designated initializer with a positional tail matching `PyTypeObject` field order. Extended the focused listobject regression to cover the added behavior/order checks.

Verification:

- Focused regressions pass for listobject, frameobject, funcobject, genericaliasobject (including `object.c`), genobject, interpreteridobject, and iterobject.
- Python test-script compilation, `bash -n` for frontier scripts, and nested/outer `git diff --check` passed.
- Full harness remains blocked by the lifecycle guard's exhausted scan budget; no full-suite pass is claimed.
- A fresh forced probe after all current listobject changes is running; log: `build/current-recheck/frontier-listobject-expanded-fixes.log`.

Compile-only evidence; no interpreter link or runtime execution. Next step: inspect the fresh frontier result and continue from the first compiler diagnostic.

---

## Previous latest revision (listobject repeat C89 declarations; forced recheck)

Date: 2026-10-03 00:57 UTC

Read `PORT_STATUS.md`, `README.md`, and the active-profile `python-3-win9x-msvc6.md` reference before acting. Preserved the existing outer and detached CPython work; no reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. CPython remains at `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`.

The recorded `_blake2/blake2s_impl.c` state was no longer the frontier. Forced-fresh probing found `Objects/genericaliasobject.c` as the first blocker. Applied one narrow initializer-compatibility slice: replaced the designated `.mp_subscript` initializer with positional `PyMappingMethods` fields `0, ga_getitem, 0` in declared field order. The first positional attempt exposed type-mismatch warnings because it omitted the leading `mp_length` slot; a stronger focused assertion failed first, then the initializer was corrected to preserve the intended mp_subscript semantics.

Exact commands/results:

- Initial forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/current-recheck/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2; `total=90 compiled=89 cached=0 skipped=0`. First diagnostic was C2059 at `genericaliasobject.c(583)` for `.mp_subscript = ga_getitem`.
- TDD RED: `python3 scripts/vc6-genericaliasobject-c89.test.py cpython/Objects/genericaliasobject.c` — exit 1 first on missing VC6-compatible initializer; after correcting the field order, that assertion passes and the script advances to the pre-existing `ga_hash second hash local must be declared at function entry` failure (exit 1). A direct assertion of the exact `0, ga_getitem, 0` field layout passed (exit 0).
- `bash scripts/vc6-probe-pythoncore-frontier.test.sh` — exit 1. The new initializer assertion and other generic-alias checks run, but existing generic-alias `ga_hash second hash local must be declared at function entry` remains failing. Also two unrelated pre-existing failures persist: console type detection order and numeric dispatch (`ValueError: substring not found`). No unrelated changes made.
- Post-change forced-fresh probe (same command) — exit 2; `total=90 compiled=89 cached=0 skipped=0`. The line-583 C2059 is gone and the ordered initializer emits no mismatch warning. New first stable errors are C2275/C2146/C2065 at line 597 for late `Py_hash_t h1`; later line-658 and subsequent diagnostics are separate. Full output: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1790989338-3437483-1c50.log`.
- Scoped `git diff --check` on the test, status file, and nested `Objects/genericaliasobject.c` — exit 0.

Files changed by this slice: `cpython/Objects/genericaliasobject.c`, `scripts/vc6-genericaliasobject-c89.test.py`, and this status log. The coding-subagent dispatch was attempted, but could not start because the delegate environment lacks the required `anthropic` Python package; completed the narrowly scoped test-first edit directly and verified it. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is claimed. Next frontier: separately test-first hoist `Py_hash_t h1` in `ga_hash`, preserving origin-first hash/error order.

---

## Previous revision (`tuple_index` loop declaration hoisted; genericaliasobject frontier advances)

Date: 2026-10-02 22:56 UTC

Read `PORT_STATUS.md`, `README.md`, and the loaded legacy-toolchain guidance before acting; the on-disk `references/python-3-win9x-msvc6.md` was not found. Preserved all existing outer and detached CPython work, including the pre-existing untracked `scripts/vc6-genericaliasobject-c89.test.py`. No reset, clean, stash, discard, commit, push, or publication. CPython remains at baseline tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`.

The recorded frameobject frontier was rechecked with a forced-fresh MSVC600 probe: it compiled through `Objects/frameobject.c`; the active first blocker is `Objects/genericaliasobject.c`. The narrow C89 slice was limited to `tuple_index()`: moved `Py_ssize_t i` to the function-entry declaration group and reused it in the loop. Scan order and `return -1` behavior are unchanged. Used exactly one focused Codex CLI coding lane (0.153.4, workspace-write); independently checked its narrow diff and ran the applicable checks. The existing focused test failed before the source edit as expected.

Exact verification:

- RED: `python3 scripts/vc6-genericaliasobject-c89.test.py cpython/Objects/genericaliasobject.c` — exit 1, `tuple_index loop variable must be declared at function entry`.
- GREEN: same command — exit 0, `genericaliasobject C89 declaration and writer order: PASS`.
- Forced fresh probe: `XDG_RUNTIME_DIR="$PWD/build/current-recheck/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2, `total=90 compiled=89 cached=0 skipped=0`. `genericaliasobject.c` passes the `tuple_index()` diagnostic. First stable remaining diagnostics begin at line 206 in `tuple_extend()` with C2143 “missing ';' before 'type'” on the C99 loop declaration; subsequent errors are follow-ons/additional C89 sites in this translation unit. Full log: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1790981507-3342471-aa90.log`.
- Focused regression rerun — exit 0, `genericaliasobject C89 declaration and writer order: PASS`.
- `bash scripts/vc6-probe-pythoncore-frontier.test.sh` — exit 1. The genericalias regression passes; two known unrelated assertions remain failing: console type lookup/cleanup order and numeric dispatch (`ValueError: substring not found`). No unrelated fixes attempted.
- Scoped `git diff --check` for `cpython/Objects/genericaliasobject.c`, the focused test and `PORT_STATUS.md` — exit 0.

Files changed by this slice: `cpython/Objects/genericaliasobject.c` and this status log. The focused test file was pre-existing and remains untracked; it was not altered this run. The generated compatibility patch was not regenerated. This is compiler-probe progress only: no `pythoncore.dll`/`python.exe` link, Wine interpreter execution, or real Windows 98 SE execution. Next frontier: inspect and test-first address only the first `tuple_extend()` loop declaration diagnostic at line 206.

---

## Previous latest revision (`frame_setlineno` C89 declarations hoisted; frameobject frontier advances)

Date: 2026-10-02 20:33 UTC

Read `PORT_STATUS.md`, `README.md`, and the loaded legacy-toolchain porting guidance before editing. The on-disk `references/python-3-win9x-msvc6.md` was not present at the path checked; the relevant project rules were available in the invoked skill content. Preserved all pre-existing outer and detached CPython work. No reset, clean, stash, discard, commit, push, or publication. CPython remains at baseline tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`.

A forced fresh VC6 probe confirmed the recorded frontier was current: 87/88 translation units compiled, `_blake2/blake2s_impl.c` compiled, and `Objects/frameobject.c` was first blocker at `frame_setlineno()` with C2275/C2146/C2065 for late `PyFrameState state` at line 686. Used one focused Codex CLI coding lane after confirming `codex-cli 0.153.4` was available. Following strict TDD, it extended `scripts/vc6-frameobject-c89.test.py`, observed expected RED before production change, then hoisted the 13 function-scope locals in `frame_setlineno()` into the opening declaration group. Initializer expressions remain assignments at their previous execution points; nested block locals, validation/error/cleanup/iteration/frame-stack ordering remain unchanged. Independently verified the diff and reran checks.

Exact commands/results:

- Initial forced probe `XDG_RUNTIME_DIR="$PWD/build/current-recheck/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2, 87/88 compiled, zero cached. First stable diagnostics were C2275/C2146/C2065 on `PyFrameState state` at `frameobject.c(686)`; subsequent errors in that function were follow-ons. Full log: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1790973232-3123322-1550.log`.
- RED focused test (before source edit): `python3 scripts/vc6-frameobject-c89.test.py cpython/Objects/frameobject.c` — exit 1, expected missing-entry-declaration assertion for `PyFrameState state;`.
- GREEN focused test: same command — exit 0, `frameobject C89 declarations and frame locals ownership order: PASS`.
- `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh` and scoped nested/outer `git diff --check` — exit 0.
- `bash scripts/vc6-probe-pythoncore-frontier.test.sh` — exit 1. The new frameobject regression passes; 250 checks pass overall. Two existing unrelated failures remain: console type lookup/cleanup assertion and numeric dispatch assertion (`ValueError: substring not found`). No unrelated fixes attempted.
- Forced post-change probe, after preparing writable workspace runtime directory: `mkdir -p build/current-recheck/runtime && chmod 700 build/current-recheck/runtime && XDG_RUNTIME_DIR="$PWD/build/current-recheck/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2, 87/88 compiled, zero cached. `frame_setlineno()` now compiles past its prior diagnostics. First stable remaining diagnostic is C2143 at `frameobject.c(900)` in the next function; further errors there and later in the translation unit are distinct follow-on blockers. Full log: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1790973669-3123322-2e50.log`.

Files changed by this slice: `cpython/Objects/frameobject.c`, `scripts/vc6-frameobject-c89.test.py`, and this log. Other attempted VC6 smoke suites encountered the same read-only Wine socket failure when invoked outside the writable runtime-directory context; shell, fixture-generation, and focused frameobject checks passed. This is compiler-probe progress only: no `pythoncore.dll`/`python.exe` link, Wine interpreter execution, or Windows 98 SE execution. Next frontier: inspect and test-first address the first diagnostic at `frameobject.c(900)`, without bundling later errors.

---

## Previous latest revision (frameobject C89 work; frontier advances past floatobject)

Date: 2026-10-02 19:09 UTC

The CPython checkout remains at baseline tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Preserved the existing outer and detached CPython working trees; no reset, clean, stash, or discard. Regenerated `compat/msvc600/cpython-3.11.16-vc6-headers.patch` from the complete nested CPython diff and verified byte-for-byte. The outer Gitea commit will contain that patch, focused tests, and this status log; the nested checkout remains detached/uncommitted.

Continued the C89 port after a fresh forced VC6 probe found `Objects/exceptions.c` at 84/85. Exception-group and exception metadata declarations were hoisted in earlier edits; subsequent forced probes compiled past exceptions, fileobject, and floatobject. In this continuation:

- `Objects/fileobject.c`: hoisted `Py_OpenCodeHookFunction hook` in `PyFile_OpenCodeObject()` while leaving lookup after path validation.
- `Objects/clinic/floatobject.c.h` and `Objects/floatobject.c`: moved the `typestr_length` declaration; corrected C89 declarations in float packing, exact deallocation, `PyFloat_AsDouble`, vectorcall, and format detection; replaced the designated `PyFloat_Type.tp_vectorcall` initializer with positional trailing slots; replaced `1ULL`-style concern in frame stack threshold via `PY_ULL(1)`.
- `Objects/frameobject.c`: corrected `frame_getlocals`, stack-swap helpers, overflow literal, stack analysis (`mark_stacks`), incompatible-stack lookup, line marking, and loop-local declarations. Execution/ownership order was retained in the focused checked paths.

Focused regressions pass:

- `python3 scripts/vc6-fileobject-opencode-c89.test.py cpython/Objects/fileobject.c`
- `python3 scripts/vc6-floatobject-pack4-c89.test.py cpython/Objects/floatobject.c cpython/Objects/clinic/floatobject.c.h`
- `python3 scripts/vc6-frameobject-c89.test.py cpython/Objects/frameobject.c`
- `git -C cpython diff --check`

The latest forced probe compiled **87/88** translation units and moved the first blocker to `Objects/frameobject.c`. First diagnostics are C2275/C2146/C2065 for late `PyFrameState state` in `frame_setlineno()` at line 686; further diagnostics in that function and later frameobject code are follow-on C89 issues. Full log: `build/current-recheck/frontier-frame-current.log`. Next step is test-first declaration hoisting in `frame_setlineno()`, preserving validation/cleanup order, then re-probe.

This is compile-frontier evidence only. No interpreter has been linked or runtime-tested under Wine or Windows 98 SE. No commit or push has yet been made for this continuation.

---

## Previous revision (fresh frontier recheck; floatobject declarations already fixed)

Date: 2026-10-02 16:22 UTC

Read `PORT_STATUS.md`, `README.md`, and the CPython/Win9x/MSVC6 reference before work. Preserved all pre-existing outer and detached CPython changes; no reset, clean, stash, discard, commit, push, or publication. CPython remains at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Re-probed because the status named `codeobject.c` while the older `_blake2/blake2s_impl.c` frontier instruction was stale. The forced fresh probe confirmed `dictobject.c` as the actual first blocker.

One narrow TDD C89 slice in `cpython/Objects/dictobject.c`: moved only `j`, `pos`, and `key` declarations in `dict_keys()` to the opening declaration group, with `j = 0` and `pos = 0` remaining after the successful allocation/retry guard. Iteration, refcounting, and return order are unchanged. Extended the pre-existing untracked focused regression `scripts/vc6-dict-consistency-c89.test.py` to assert declaration location and the exact following sequence. Used exactly one focused Codex coding-agent lane; independently inspected its diff. No code outside `dict_keys()` changed in this slice; the other existing nested/outer changes remain untouched.

Exact verification:

- RED: `python3 scripts/vc6-dict-consistency-c89.test.py cpython/Objects/stringlib/eq.h cpython/Objects/dictobject.c` — exit 1 before the production edit, expected `dict_keys locals must be declared at function entry without initializers`.
- GREEN and independent rerun: same command — exit 0, `dict consistency C89 declarations and logic order: PASS`.
- `bash scripts/vc6-probe-pythoncore-frontier.test.sh` — exit 1. New dict regression passed; existing console type-detection-order check failed (`console type lookup and cleanup order must remain unchanged`) and existing numeric-dispatch check raised `ValueError: substring not found`. No unrelated fix attempted.
- Forced fresh compiler probe `XDG_RUNTIME_DIR="$PWD/build/current-recheck/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2, `total=83 compiled=82 cached=0 skipped=0`. `_blake2/blake2s_impl.c` and `dict_keys()` compile past the prior frontier. First stable errors are in `dict_values()` at `dictobject.c(2700–2701)`: C2275/C2146/C2065 for late `Py_ssize_t j, pos` and C2275/C2065 for late `PyObject *value`; later dictobject diagnostics are distinct follow-on blockers and untouched. Full output: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1790958052-2772156-1810.log`.
- `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh`, focused and scoped `git diff --check` — exit 0.

Files changed by this slice: `cpython/Objects/dictobject.c`, `scripts/vc6-dict-consistency-c89.test.py`, and this log. This is compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution. The existing compatibility patch was not regenerated. Next frontier: test-first hoist only the late locals in `dict_values()`, preserving the successful-allocation/retry boundary and iteration/refcount order.

---

## Previous latest revision (`PyCode_Addr2Location` C89 declaration hoisted; frontier advances in codeobject.c)

Date: 2026-10-02 12:01 UTC

Read `PORT_STATUS.md`, `README.md`, and the active-profile CPython/Win9x/MSVC6 reference before work. Preserved all pre-existing outer and detached CPython edits; no reset, clean, stash, discard, commit, push, or publication. CPython remains at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Confirmed Codex CLI 0.153.4 was available and used exactly one focused coding-agent lane with workspace-write sandbox.

The recorded `advance_with_locations_no_columns()` frontier was confirmed by a forced fresh VC6 probe. Applied one narrow C89 declaration-order slice in `Objects/codeobject.c`: moved only `PyCodeAddressRange bounds` in `PyCode_Addr2Location()` to the function entry declaration group. `_PyCode_InitAddressRange()` remains at its original execution point after the address assertion; negative-address fast return and all lookup/retreat/advance order are unchanged. Extended `scripts/vc6-codeobject-c89.test.py` with a focused declaration and full execution-order assertion. The compatibility patch was regenerated from the complete nested diff and verified byte-for-byte.

Exact verification:

- RED: `python3 scripts/vc6-codeobject-c89.test.py cpython/Objects/codeobject.c` — exit 1, expected `PyCode_Addr2Location bounds must be declared before execution`.
- GREEN and independent focused rerun: same command — exit 0, `codeobject C89 declarations and ownership order: PASS`.
- `bash scripts/vc6-probe-pythoncore-frontier.test.sh` — exit 1. The new codeobject check and most suite checks pass; two known unrelated failures remain: console type detection ordering, and numeric-dispatch assertion (`ValueError: substring not found`). No unrelated fix was attempted.
- Forced fresh VC6 probe `XDG_RUNTIME_DIR="$PWD/build/current-recheck/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2, `total=80 compiled=79 cached=0 skipped=0`. `codeobject.c` passes the previous line-1028 `PyCodeAddressRange bounds` diagnostic. The next first stable diagnostics are C2143 at line 1071 before `const`, then dependent C2065 `ptr` undeclared at 1073 and C2143/C2065 on `code` at 1075–1076 in `previous_code_delta()`; later diagnostics are distinct and untouched. Full output: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1790942268-2495375-b650.log`.
- `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch`; `cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` — exit 0. Nested and outer scoped `git diff --check` — exit 0.

Files changed by this slice: `cpython/Objects/codeobject.c`, `scripts/vc6-codeobject-c89.test.py`, regenerated `compat/msvc600/cpython-3.11.16-vc6-headers.patch`, and this status log. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution. Next frontier: test-first hoist only the `previous_code_delta()` local(s) responsible for the first fresh diagnostic, preserving its first-entry return and backward scan order.

---

Read `PORT_STATUS.md`, `README.md`, and the active-profile CPython/Win9x/MSVC6 reference. Preserved all pre-existing outer and detached CPython edits; no reset, clean, stash, discard, commit, push, or publication. CPython remains at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Confirmed Codex CLI 0.153.4 was available and used exactly one focused coding-agent lane, without bypassing its sandbox.

A forced fresh VC6 probe reconfirmed `_blake2/blake2s_impl.c` compiles and the active first blocker is `Objects/codeobject.c(964–968)` in `advance_with_locations()`. Applied one C89 declaration-order slice: moved only `int first_byte` and `int code` to the function's opening declaration group; both assignments remain immediately after `ASSERT_VALID_BOUNDS(bounds)`, preserving byte-read/decode/range-update/dispatch order. Added a focused ordering assertion to the existing untracked codeobject regression test and observed RED before the production edit.

Exact verification:

- RED: `python3 scripts/vc6-codeobject-c89.test.py cpython/Objects/codeobject.c` — exit 1, expected `advance_with_locations entry declaration missing or late: int first_byte;`.
- GREEN: same command — exit 0, `codeobject C89 declarations and ownership order: PASS`.
- Independent baseline/hash check — passed: exactly the requested `cpython/Objects/codeobject.c` and `scripts/vc6-codeobject-c89.test.py` changed in the implementation slice; existing checks and all other pre-existing edits preserved. Scoped nested/outer `git diff --check` — exit 0.
- `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh` — exit 1. The full script's codeobject and new assertions pass; two existing unrelated checks remain failing: console type detection order, and numeric dispatch (`ValueError: substring not found`).
- Forced fresh VC6 command `XDG_RUNTIME_DIR="$PWD/build/current-recheck/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2, `total=80 compiled=79 cached=0 skipped=0`. `codeobject.c` now compiles past the `advance_with_locations()` C2143/C2065 diagnostics. Next first stable diagnostics are C2275/C2146/C2065 at line 1028 for late `PyCodeAddressRange bounds` in `advance_with_locations_no_columns`; subsequent diagnostics are separate. Full output: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1790934445-2409488-98d0.log`.
- Regenerated `compat/msvc600/cpython-3.11.16-vc6-headers.patch` from the complete nested diff; `cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` — exit 0. Scoped diff checks — exit 0.

Files changed by this slice: `cpython/Objects/codeobject.c`, `scripts/vc6-codeobject-c89.test.py`, regenerated compatibility patch, and this status log. Compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution. Next frontier: test-first hoist only the declaration responsible for the first fresh `advance_with_locations_no_columns()` diagnostic around line 1028; preserve statement order and leave later diagnostics separate.

---

## Previous latest revision (`_PyCode_InitAddressRange` locals hoisted; frontier advances in codeobject.c)

Date: 2026-10-02 05:29 UTC

Read `PORT_STATUS.md`, `README.md`, and the CPython 3.11.16/Win9x/MSVC6 reference first. Preserved all existing outer and detached CPython work; no reset, clean, stash, discard, commit, push, or publication. CPython remains at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. The stale `_blake2/blake2s_impl.c` frontier is cleared; a forced fresh probe confirmed the active frontier remained in `Objects/codeobject.c`.

One narrow test-first C89 slice in `_PyCode_InitAddressRange`: hoisted only `const char *linetable` and `Py_ssize_t length` into the opening declaration group, preserving their assignment points and assertion → byte-string access → length query → range initialization order. Extended the existing untracked focused regression script. Used one focused Codex coding-agent lane (codex-cli 0.153.4); the CLI was available and ran under `workspace-write`, with no approval override. Its diff was independently inspected.

Exact verification:

- RED: `python3 scripts/vc6-codeobject-c89.test.py cpython/Objects/codeobject.c` — exit 1, expected `_PyCode_InitAddressRange entry declaration missing or late: const char *linetable;`.
- GREEN: same command — exit 0, `codeobject C89 declarations and ownership order: PASS`.
- `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh` — exit 0.
- Focused regression suite `bash scripts/vc6-probe-pythoncore-frontier.test.sh` — exit 1. The codeobject check passes; two unrelated existing checks still fail: `console type detection preserves control/cleanup order with C89 locals` and `numeric dispatch helpers preserve slot order with C89 locals` (the latter's embedded check raises `ValueError: substring not found`). No changes made to those tests or source areas.
- Forced fresh compiler probe: `XDG_RUNTIME_DIR="$PWD/build/current-recheck/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2, `total=80 compiled=79 cached=0 skipped=0`. `codeobject.c` now compiles past the prior `_PyCode_InitAddressRange` diagnostics at lines 825–826. Next first stable blocker: `previous_code_delta()` at `codeobject.c(880)`, C2143 before `const`, with dependent C2065 `ptr` undeclared and illegal-indirection errors at lines 881/884. Later declaration-order blockers remain untouched. Full probe log: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1790918777-2246167-bd0.log`.
- `git -C cpython diff --check -- Objects/codeobject.c` and `git diff --check -- scripts/vc6-codeobject-c89.test.py` — exit 0.

Files changed in this slice: `cpython/Objects/codeobject.c`, `scripts/vc6-codeobject-c89.test.py`, and this log. The compatibility patch was not regenerated or synchronized. This is compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution. Next slice: test-first hoist only `previous_code_delta()`'s late `ptr` declaration, preserving the first-entry return before pointer calculation and scan order.

---

## Previous latest revision (`PyCode_Addr2Line` bounds declaration hoisted; frontier advances in codeobject.c)

Date: 2026-10-02 03:10 UTC

Preserved all pre-existing outer and detached CPython changes. No reset, clean, stash, discard, commit, push, or publication. CPython remains at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Re-probed rather than assuming the previous `_PyVectorcall_Call` frontier: `_blake2/blake2s_impl.c` and `Objects/call.c` compile; the actual first blocker was the C89 declaration of `PyCodeAddressRange bounds` in `PyCode_Addr2Line` at `Objects/codeobject.c` around line 804 (not `_PyLineTable_NextAddressRange`).

One narrow C89 slice: moved only the `PyCodeAddressRange bounds` declaration to the opening declaration group of `PyCode_Addr2Line`; `_PyCode_InitAddressRange()` remains at its original execution point after the negative-address and line-array fast paths. Added a focused declaration/order assertion to the existing untracked regression script `scripts/vc6-codeobject-c89.test.py`, retaining all earlier checks. The first test run against the existing source passed its previous checks; after adding the new assertion it failed as expected with `PyCode_Addr2Line bounds must be declared before execution` (exit 1), then passed after the source edit.

Exact verification:

- Initial forced fresh probe: `XDG_RUNTIME_DIR="$PWD/build/current-recheck/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2, `total=80 compiled=79 cached=0 skipped=0`. `_blake2/blake2s_impl.c` and `Objects/call.c` compiled. First blocker was `codeobject.c(804)` C2275/C2146/C2065 on `PyCodeAddressRange bounds`; follow-on errors were C89 declarations in this translation unit.
- RED focused test: `python3 scripts/vc6-codeobject-c89.test.py cpython/Objects/codeobject.c` — exit 1 with the expected assertion above.
- GREEN/focused check: same command — exit 0, `codeobject C89 declarations and ownership order: PASS`.
- `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh` — exit 1. Shell syntax and most regression checks passed, including the new codeobject test. Two unrelated existing failures remain: `console type detection preserves control/cleanup order with C89 locals`, and the numeric-dispatch check raises `ValueError: substring not found`.
- Forced fresh post-change probe (same command) — exit 2, `total=80 compiled=79 cached=0 skipped=0`. `codeobject.c` now compiles past the `PyCode_Addr2Line` bounds diagnostic. The next first diagnostics are at lines 825–826: C2143/C2275/C2065 for late `const char *linetable` and `Py_ssize_t length` in `_PyCode_InitAddressRange`; later independent declaration-order blockers in `codeobject.c` remain untouched.
- `git -C cpython diff --check -- Objects/codeobject.c && git diff --check -- scripts/vc6-codeobject-c89.test.py` — exit 0.

Files changed in this slice: `cpython/Objects/codeobject.c`, `scripts/vc6-codeobject-c89.test.py`, and this status log. The compatibility patch was not synchronized or regenerated. This is compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution. Next frontier: test-first hoist only `linetable` and `length` in `_PyCode_InitAddressRange`, preserving the assertion → byte-string access → length query → range initialization order. Pre-existing outer and nested changes remain preserved.

---

## Previous latest revision (`_PyObject_MakeTpCall` result local moved to C89 declaration group; frontier at `_PyVectorcall_Call`)

Date: 2026-10-02 01:09 UTC

Read `PORT_STATUS.md`, `README.md`, and the active CPython/Win9x/MSVC6 reference before acting. Preserved all pre-existing outer and detached CPython work. CPython remains at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. No reset, clean, stash, discard, commit, push, or publication. Re-probed instead of assuming the recorded frontier: `_blake2/blake2s_impl.c` compiles, and `Objects/call.c` is now the actual first blocker.

One narrow C89 slice in `cpython/Objects/call.c`: `_PyObject_MakeTpCall` now assigns `result = NULL` at its original execution point after keyword-dict preparation; its `PyObject *result` declaration is in the opening declaration group. Control flow, result initialization timing, recursive-call guard, and cleanup order are preserved. The existing focused test `scripts/vc6-call-first-c89.test.py` was run before the edit and failed as expected with `_PyObject_MakeTpCall locals must be declared separately from assignment` (exit 1). After the source edit, that regression passed. Its cleanup-order assertion was refined to distinguish the error-path early tuple decref from the post-recursion cleanup; this test-only correction preserves the behavior it intends to check.

Exact verification:

- `python3 scripts/vc6-call-first-c89.test.py cpython/Objects/call.c` — exit 0; `call.c first-frontier C89 declarations and dispatch order: PASS`.
- `bash -n scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh` — exit 1. Most applicable regressions pass, including the new `call.c` check, but pre-existing failures remain: `console type detection preserves control/cleanup order` and the numeric-dispatch check's `ValueError: substring not found`. No unrelated fix was attempted.
- Forced fresh compile frontier: `XDG_RUNTIME_DIR="$PWD/build/current-recheck/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2, `total=76 compiled=75 cached=0 skipped=0`. `call.c` now compiles past the previous `_PyObject_MakeTpCall` diagnostics. First stable remaining diagnostics are in `_PyVectorcall_Call`: C2143 at `call.c(248)` before `type`, followed by dependent C2065 `nargs` at line 252 and C2275/C2059 on late `PyObject *const *args` and `PyObject *kwnames` declarations at lines 256–257. Later errors in this translation unit are distinct follow-on declaration-order blockers and remain untouched. Full compiler log: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1790903149-1934339-c990.log`.
- `git -C cpython diff --check -- Objects/call.c` and `git diff --check -- scripts/vc6-call-first-c89.test.py` — exit 0.

Files changed in this slice: `cpython/Objects/call.c`, `scripts/vc6-call-first-c89.test.py`, and `PORT_STATUS.md`. The native delegation tool was unavailable because its Anthropic dependency is missing; the scheduled-run Codex CLI command was blocked by the approval guard, so the narrowly scoped change was applied directly and verified independently. Compatibility patch synchronization remains unresolved. This is compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE test. Next frontier: test-first hoist only `_PyVectorcall_Call`'s `nargs`, `args`, `kwnames`, and `result` locals while preserving tuple access, fast-path, unpack/call/free, and result-check order.

---

## Latest revision (fastsearch C89 blockers cleared; bytearray join is current frontier)

Fresh forced VC6 frontier probe exited 2 with `total=73 compiled=72 cached=0 skipped=0`. Earlier blockers in `Objects/abstract.c`, `Objects/boolobject.c`, the bytearray Clinic/core helpers, and `Objects/stringlib/fastsearch.h` are now passed by the compiler. Current first diagnostic is `cpython/Objects/bytearrayobject.c(2030)`: C2275/C2065 on the late `PyObject *ret` in `bytearray_join`, after `self->ob_exports++`.

Next slice: add a regression, declare `ret` at the function's opening, and assign it after the export increment. Preserve the increment → join call → decrement → return sequence. Then immediately rerun the forced frontier; do not assume the 73rd unit is clean until that probe reports it.

Verification: `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh` and scoped `git diff --check` passed after the latest edits. The full regression script is blocked before execution by the lifecycle guard's script-scan budget exhaustion; the new regression blocks have therefore not been verified by that suite. This is compile-frontier evidence only—no linked interpreter, Wine execution, or Windows 98 SE runtime test.

The worktree remains dirty and preserved. CPython remains at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. The compatibility patch is still unsynchronized/unverified. After the translation-unit frontier clears, remaining gates include rerunning the regressions, regenerating/verifying the compatibility patch against pristine upstream, linking an interpreter, then separate Wine and actual Windows 98 SE runtime validation. No reset, clean, stash, discard, commit, or push was performed.

---

## Latest revision (`multibytecodec.c` C89/type-definition blockers cleared; frontier advances to `_winapi.c`)

Date: 2026-10-01 19:36 UTC

Continued the forced VC6 frontier while preserving the dirty outer repo and detached CPython checkout. No reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. CPython remains at `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`.

Since the previous log entry, the frontier advanced through `_io/textio.c`, `winconsoleio.c`, `_iomodule.c`, CJK codec helpers, and `multibytecodec.c`. Preserved evaluation points and cleanup order while hoisting C89 locals; adjusted Windows offset bounds to the established `PY_LLONG_MIN/MAX` aliases; changed UTF-16 high-surrogate detection to the documented U+D800–U+DBFF range instead of the Vista-era `C3_HIGHSURROGATE` flag; converted C99 designated `PyModuleDef` and `PyType_Spec` initializers using the verified field order; and updated generated Clinic wrappers. Added focused source/order assertions alongside these edits.

Exact verification:

- Latest frontier command: `XDG_RUNTIME_DIR="$PWD/build/current-recheck/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2, `total=69 compiled=68 cached=0 skipped=0`. `_winapi.c` now compiles past the missing legacy SDK names (using exact guarded spellings), C89 environment helper declarations, and the Vista-only process attribute APIs. The VC6 branch uses `STARTUPINFOW`, omits `EXTENDED_STARTUPINFO_PRESENT`, and returns `ERROR_CALL_NOT_IMPLEMENTED` if non-None startup attribute lists are requested; the modern branch remains unchanged. The first remaining errors are missing `LCMAP_SORTHANDLE` and `LCMAP_HASH` at `_winapi.c(1827)`, then further C89 declarations in `_winapi_LCMapStringEx_impl`; `LCMapStringEx` itself is Vista-only and still requires a real Win9x-compatible path before link/runtime testing.
- Focused checks for `_winapi` legacy constants, environment helper C89/order behavior, and the VC6 `CreateProcess` branch passed, as did the earlier CJK type/state/module and `_io` declaration/alias/order checks. `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh` and scoped `git diff --check` passed immediately before the latest frontier run.
- `bash scripts/vc6-probe-pythoncore-frontier.test.sh` remains blocked by the lifecycle guard’s script-scan budget exhaustion; it did not run to completion and is not reported as passing. A repo-wide `git diff --check` also reports existing trailing-whitespace lines in the already-dirty `compat/msvc600/cpython-3.11.16-vc6-headers.patch`; that compatibility patch was not edited here. Scoped checks for the files touched in this slice pass.

Files changed in this work include the `_io` sources and Clinic headers, `Modules/cjkcodecs/cjkcodecs.h`, `multibytecodec.c`, `Modules/_winapi.c`, the frontier regression script, and this log. This remains compile-frontier evidence only: no interpreter has been linked or runtime-tested under Wine or Windows 98 SE. The compatibility patch remains unsynchronized/unverified. Next slice: analyze a Win9x-compatible implementation or explicit unsupported behavior for the `LCMapStringEx` path before changing its constants, then continue the C89 cleanup in that function.

---

## Previous latest revision (`winconsoleio.c` readinto declarations hoisted; frontier advances within translation unit)

Date: 2026-10-01 18:35 UTC

Read `PORT_STATUS.md`, `README.md`, and `references/python-3-win9x-msvc6.md`. Preserved all pre-existing changes across the outer repository and detached CPython checkout. No reset, clean, stash, discard, unrelated overwrite, commit, push, or publication. CPython remains at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`.

The recorded `_channel_is_associated()` frontier and the possibility that `_blake2/blake2s_impl.c` remained the target were stale. A forced fresh probe showed `_blake2/blake2s_impl.c` compiles and the actual first blocker was `cpython/Modules/_io/winconsoleio.c`, in `readinto()` at late declarations for `handle`, `wlen`, `read_len`, `n`, `wbuf`, `err`, and `u8n`. Used one focused Codex coding lane (Codex 0.153.4, logged in). It hoisted these seven locals to the opening declaration group and converted initializers to assignments at their prior execution points. No intended evaluation, control-flow, or cleanup changes. Added an exact-body regression to `scripts/vc6-probe-pythoncore-frontier.test.sh`.

TDD: the new focused regression was run RED before the source edit (exit 1 with the expected declaration/order assertion), then GREEN after the edit (exit 0). The full regression script was rerun independently after implementation: exit 1. The new `readinto` assertion passes. One existing test, `console type detection preserves control/cleanup order`, still fails; checks of the baseline source confirm this failure predates this slice. `console read preserves surrogate-boundary growth on legacy Windows` passes now and also passed against baseline, so the earlier reported failure was not reproduced. Other applicable assertions pass. Shell syntax and targeted diff checks pass.

Exact verification:

- `XDG_RUNTIME_DIR="$PWD/build/current-recheck/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2, `total=60 compiled=59 cached=0 skipped=0`. `readinto()` now compiles past its C2275/C2146/C2065 diagnostics. Next errors in this translation unit: C2275/C2065 on `wchar_t *tmp` at `winconsoleio.c(842)` in `readall()`, followed by Clinic `Py_ssize_t mode_length` errors at `Modules/_io/clinic/winconsoleio.c.h(75)`; preserve these as separate blockers.
- `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh` — exit 1; the single known type-detection regression above remains; new readinto and surrogate tests pass.
- `git -C cpython diff --check -- Modules/_io/winconsoleio.c && git diff --check -- scripts/vc6-probe-pythoncore-frontier.test.sh` — exit 0.
- Status check showed all pre-existing changes preserved; CPython baseline tag/commit unchanged. `PORT_STATUS.md` was not changed by the coding lane; this entry is the only status-log update for this run.

Files changed by this slice: `cpython/Modules/_io/winconsoleio.c`, `scripts/vc6-probe-pythoncore-frontier.test.sh`, and `PORT_STATUS.md`. This is compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution. The compatibility patch remains unsynchronized/unverified. Next frontier: test-first hoist the late `wchar_t *tmp` declaration in `readall()` while preserving allocation/reallocation/error order; treat generated Clinic declaration errors as a separate subsequent blocker.

---

## Previous latest revision (`_channel_recv` C89 locals hoisted; frontier advances)

Date: 2026-10-01 16:25 UTC

Read `PORT_STATUS.md`, `README.md`, and the CPython 3.11.16/Win9x/MSVC6 reference before acting. Preserved all pre-existing outer and nested work. No reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. CPython remains detached at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`.

The recorded `_channels_remove()` frontier was stale by this run: fresh forced probe first failed in `_channel_recv()` at line 1382 with C2275/C2146/C2065 on the late `PyThread_type_lock mutex` declaration. Used one focused Codex coding lane after confirming Codex 0.153.4 was installed and authenticated. In `_channel_recv()`, hoisted the five function-scope locals (`interp`, `mutex`, `chan`, `data`, `obj`) into its opening declaration group and converted the inline initializers into assignments at their previous execution points. Lock acquisition/release, null/error handling, cleanup, and return order are preserved. Added one exact-body regression for that function.

TDD: the test was added and run before editing production source; it failed as expected (exit 1). After the C change, the focused regression passed (exit 0). The subagent also ran the final focused regression and `bash -n`; both exited 0. Subsequent independent verification:

- `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh` — exit 0.
- `bash scripts/vc6-probe-pythoncore-frontier.test.sh` — exit 1. The new `_channel_recv` regression passed, but the suite then failed in a separately present `_channel_recv/drop/association` test block at `_channel_drop`; that test expects a body change not made in this slice. It appeared during the delegated work and was preserved, not modified or treated as part of this slice.
- Fresh forced probe `XDG_RUNTIME_DIR="$PWD/build/current-recheck/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2, `total=53 compiled=52 cached=0 skipped=0`. `_channel_recv()` now compiles past its previous diagnostics. The next reported first blocker is `_xxsubinterpretersmodule.c(1553)` C2143 before `type`, with dependent C2065 `end` at line 1556 in `_channel_is_associated()`; later independent C89 and type-spelling blockers remain untouched.
- `git -C cpython diff --check -- Modules/_xxsubinterpretersmodule.c` and `git diff --check -- scripts/vc6-probe-pythoncore-frontier.test.sh` — exit 0.

Files changed by this slice: `cpython/Modules/_xxsubinterpretersmodule.c`, `scripts/vc6-probe-pythoncore-frontier.test.sh`, and `PORT_STATUS.md`. All pre-existing changes were preserved. This is compiler-probe progress only: no `pythoncore.dll`/`python.exe` link, Wine interpreter execution, or real Windows 98 SE execution. Compatibility patch remains unsynchronized/unverified. Next frontier: separately inspect/test-first hoist `_channel_is_associated()`'s late `_channelend *end` declaration, preserving lookup/error order; address the unrelated suite expectation only in its own deliberate slice.

---

## Latest revision (`_xxsubinterpretersmodule.c` C89 helper declarations advanced; frontier at `_channels_remove`)

Date: 2026-10-01 16:10 UTC

Continued the forced VC6 compile frontier at `cpython/Modules/_xxsubinterpretersmodule.c`. Preserved all pre-existing work; no reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. CPython remains detached at `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`.

C89 declaration-order fixes made in this slice, preserving assignment, lock, cleanup, error, and iteration order:

- `_copy_raw_string()`: hoisted `copied`; kept allocation after the UTF-8 null check.
- `_sharednsitem_apply()`, `_sharedns_free()`, `_get_shared_ns()`, `_sharedns_apply()`: hoisted locals and loop indices.
- `_sharedexception_bind()`: hoisted outer locals; kept `msg` at the start of its nested block.
- `_channel_close_interpreter()`, `_channels_lookup()`, `_channels_add()`, `_channels_close()`: hoisted locals while retaining lock acquisition, lookup, and result initialization positions.

Added focused exact-body/order regressions for those helpers. New tests were run RED against the prior code and then GREEN after each relevant edit. Latest focused check run: 13 test blocks passed (four `timemodule.c` checks and nine `_xxsubinterpretersmodule.c` checks).

Fresh forced frontier command `XDG_RUNTIME_DIR="$PWD/build/current-recheck/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` exited 2 with `total=53 compiled=52 cached=0 skipped=0`. The earlier `_copy_raw_string`, shared-namespace, exception, and channel-close errors were cleared. The next first blocker is `_xxsubinterpretersmodule.c(1143)`, C2275 at the late `_channelref *prev` declaration in `_channels_remove()`; line 1144 similarly flags `_channelref *ref`. Later errors in this translation unit include further C89 declaration-order sites; address them from fresh compiler evidence.

`git diff --check` passed for both modified C files and the regression script. The full regression shell suite and its shell syntax check were not rerun; the lifecycle guard had blocked that script due to scan-budget exhaustion. No interpreter has been linked or run under Wine or Windows 98 SE. The compatibility patch remains unsynchronized/unverified.

Files changed by this slice: `cpython/Modules/_xxsubinterpretersmodule.c`, `scripts/vc6-probe-pythoncore-frontier.test.sh`, and this status log. `timemodule.c` changes remain from the preceding slice.

---

## Previous latest revision (Windows pysleep declarations moved before first statement; frontier advances to `_xxsubinterpretersmodule.c`)

Date: 2026-10-01 15:26 UTC

Continued the `pysleep()` C89 fix. The preceding attempt hoisted Windows locals only to the `#else` branch, which still followed `assert(timeout >= 0)` in the VC6-preprocessed function. Preserved all existing work; no reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. CPython remains detached at `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`.

Moved the `MS_WINDOWS`-guarded declarations for `timeout_100ns`, `relative_timeout`, `timer`, `sigint_event`, `events[2]`, and `rc` to the opening declaration group in `pysleep()`, before the assert. Removed the declarations from the later Windows branch; kept assignments and execution order at their prior points. Updated `PY_TIME_SLEEP_TEST` to require the locals before the first statement and the branch body to contain only the existing assignments/control flow.

TDD and focused checks: the updated sleep regression failed against the prior source with the intended declaration-placement assertion. After the source edit, `PY_TIME_STATE_TEST`, `PY_TIMEZONE_TEST`, `PY_TIMEMODULE_DEF_TEST`, and `PY_TIME_SLEEP_TEST` all passed.

Fresh forced frontier command `XDG_RUNTIME_DIR="$PWD/build/current-recheck/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` exited 2 with `total=53 compiled=52 cached=0 skipped=0`. `timemodule.c` is now past the frontier. The next first blocker is `cpython/Modules/_xxsubinterpretersmodule.c(21)`, C2143 before `type` at `char *copied = PyMem_Malloc(...)` in `_copy_raw_string()`, after the `str == NULL` check. The following errors in that file are likely cascading; inspect the first diagnostic and fix one declaration-order family at a time.

`git diff --check` passed for the changed `timemodule.c` and regression script. The full regression shell suite and shell syntax check were not rerun for this slice; only the four focused Python blocks and forced frontier were exercised. No linked interpreter, Wine execution, or Windows 98 SE runtime test. Compatibility patch remains unsynchronized/unverified.

Files changed by this slice: `cpython/Modules/timemodule.c`, `scripts/vc6-probe-pythoncore-frontier.test.sh`, and this status log.

---

## Previous latest revision (Windows pysleep C89 declarations hoisted; timemodule remains compiler frontier)

Date: 2026-10-01 14:24 UTC

Continued from the freshly recorded `timemodule.c` Windows `pysleep()` declaration frontier. Read `PORT_STATUS.md`, `README.md`, and `python-3-win9x-msvc6.md` before work. Preserved all pre-existing outer and nested work; no reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. CPython remains detached at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`.

Used one focused Codex coding-agent lane after confirming `codex` is installed (`codex-cli 0.153.4`). The narrow `MS_WINDOWS` branch of `pysleep()` now declares `_PyTime_t timeout_100ns`, `LARGE_INTEGER relative_timeout`, `HANDLE timer`, `HANDLE sigint_event`, `HANDLE events[2]`, and one shared `DWORD rc` in its opening declaration group. Initializers became assignments at the original execution points; event array initialization became two ordered assignments; branch-local `rc` declarations were removed. No API or control-flow change intended. Added an exact-branch regression to `scripts/vc6-probe-pythoncore-frontier.test.sh`.

TDD: the new regression was first run against the prior source and failed as expected with the declaration-hoisting assertion (exit 1). After the source edit, the focused assertion passed; independent complete frontier regression run passed.

Exact verification:

- `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh` — exit 0; full suite printed `ALL TESTS PASSED`.
- Fresh forced VC6 probe `XDG_RUNTIME_DIR="$PWD/build/current-recheck/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2, `total=51 compiled=50 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiles. `timemodule.c` remains blocked at the original first error: C2143 at line 2210 before `type`, now pointing at the hoisted `_PyTime_t timeout_100ns` declaration. The declaration group is still after the earlier executable `assert(timeout >= 0);` at function line 2131, so this move did not satisfy C89's function-scope declaration order. The following C2275/C2146/C2065 errors for Windows locals are cascading; no frontier advancement is claimed. Next narrow fix should place the Win32 declarations before the assertion while preserving the assertion and all initialization points. The prior later `WaitableTimerEx`/API compatibility concerns were not addressed.
- `git diff --check -- scripts/vc6-probe-pythoncore-frontier.test.sh` and `git -C cpython diff --check -- Modules/timemodule.c` — exit 0.
- The overall diff check remains known to fail on pre-existing whitespace in the untouched generated compatibility patch; it was not modified.

Changed by this slice: `cpython/Modules/timemodule.c`, `scripts/vc6-probe-pythoncore-frontier.test.sh`, and this log. Existing compatibility patch remains unsynchronized/unverified. This is compiler-probe progress only: no `pythoncore.dll`/`python.exe` link, Wine interpreter execution, or real Windows 98 SE execution. Next step: inspect the exact first fresh diagnostic and preprocessor structure in Windows `pysleep()`; establish why the opening declaration group still fails before choosing any further narrow slice.

---

## Previous latest revision (timemodule PyModuleDef initializer converted; frontier advances to Windows pysleep declarations)

Date: 2026-10-01 14:19 UTC

Continued from the `timemodule.c` designated-initializer blocker. Preserved all pre-existing work; no reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. CPython remains detached at `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`.

In `cpython/Modules/timemodule.c`, converted the `timemodule` `PyModuleDef` from C99 designated fields to positional fields. Verified the order against `Include/moduleobject.h`: `m_base`, `m_name`, `m_doc`, `m_size`, `m_methods`, `m_slots`, `m_traverse`, `m_clear`, `m_free`. Added a regression in `scripts/vc6-probe-pythoncore-frontier.test.sh` that checks the exact initializer field order.

TDD: the new focused check failed against the designated initializer with the expected field-order assertion, then passed after the source change. Focused `PY_TIME_STATE_TEST`, `PY_TIMEZONE_TEST`, and `PY_TIMEMODULE_DEF_TEST` all passed.

Verification:

- Fresh forced frontier command `XDG_RUNTIME_DIR="$PWD/build/current-recheck/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh`: exit 2, `total=51 compiled=50 cached=0 skipped=0`. The C2059 at `timemodule.c(2108)` is gone. The next first blocker is C2143 at line 2210 in the Windows `pysleep()` branch; further diagnostics concern declarations for `timeout_100ns`, `relative_timeout`, `timer`, `events`, and `rc`.
- Nested and outer `git diff --check` for the changed C source and shell test: exit 0.
- The full regression shell script remains unrun because the lifecycle guard exhausted its script-scan budget. No interpreter has been linked or run under Wine or Windows 98 SE. The compatibility patch remains unsynchronized/unverified after recent edits.

Files changed by this slice: `cpython/Modules/timemodule.c`, `scripts/vc6-probe-pythoncore-frontier.test.sh`, and this status log.

---

## Previous latest revision (init_timezone C89 declarations hoisted; frontier advances to PyModuleDef initializer)

Date: 2026-10-01 14:03 UTC

Continued from the recorded `timemodule.c` timezone blocker. Preserved all pre-existing work; no reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. CPython remains detached at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`.

In `cpython/Modules/timemodule.c`, hoisted `otz0`/`otz1` and Windows-only `TIME_ZONE_INFORMATION tzinfo = {0}` to `init_timezone()`'s opening declaration group. Removed the late declarations without moving `tzset()`, timezone constants, `GetTimeZoneInformation()`, Unicode conversions, or error checks. Added an exact-body regression in `scripts/vc6-probe-pythoncore-frontier.test.sh`.

TDD: the corrected timezone regression was run against the pre-fix body and failed with the expected hoisting assertion; after the source edit it passed. The existing timemodule state regression also passed. The full regression shell script could not run because the lifecycle guard reported its script-scan budget exhausted; do not infer that full suite or shell syntax check passed.

Verification:

- Focused embedded checks `PY_TIME_STATE_TEST` and `PY_TIMEZONE_TEST`: passed.
- Fresh forced frontier command `XDG_RUNTIME_DIR="$PWD/build/current-recheck/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh`: exit 2, `total=51 compiled=50 cached=0 skipped=0`. The previous errors at `timemodule.c(1752)` and `(1762)` are gone. The next first blocker is C2059 at line 2108 (`.` in the designated `PyModuleDef` initializer). Subsequent diagnostics at lines 2210+ concern declaration order in Windows `pysleep()`.
- `git -C cpython diff --check -- Modules/timemodule.c` and `git diff --check -- scripts/vc6-probe-pythoncore-frontier.test.sh`: exit 0.

No interpreter has been linked or run under Wine or Windows 98 SE. The compatibility patch remains unsynchronized/unverified after recent edits. Files changed by this slice: `cpython/Modules/timemodule.c`, `scripts/vc6-probe-pythoncore-frontier.test.sh`, and this status log.

---

## Previous latest revision (timemodule state locals hoisted; frontier advances to Windows timezone declarations)

Date: 2026-10-01 12:09 UTC

Read `PORT_STATUS.md`, `README.md`, and `python-3-win9x-msvc6.md` before work. Preserved all pre-existing outer and nested edits; no reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. CPython remains detached at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. The prior recorded Wine socket issue no longer blocked compilation when using the writable workspace-local `XDG_RUNTIME_DIR=build/current-recheck/runtime`.

The forced fresh probe confirmed the frontier had advanced from `_blake2/blake2s_impl.c` to `timemodule.c`: 50/51 compiled, zero cached. It compiled `_blake2/blake2s_impl.c` successfully. Earliest reported `timemodule.c` errors were C2275/C2065 around `time_module_state *state` at lines 509, 551, 775, and 971. Used exactly one focused Codex coding-agent lane. TDD RED: `bash scripts/vc6-probe-pythoncore-frontier.test.sh > /tmp/timemodule-state-red.log 2>&1` exited 1; new exact-body assertion failed for all four functions. GREEN: same script redirected to `/tmp/timemodule-state-green.log` exited 0 and printed `ALL TESTS PASSED`. The slice hoists only `time_module_state *state` in `time_gmtime`, `time_localtime`, `time_strftime`, and `time_asctime`, with `get_time_state(module)` assignments retained at their prior execution points. Independently inspected the source diff and verified all pre-existing test content remained intact.

After the edit, a forced fresh probe using `XDG_RUNTIME_DIR="$PWD/build/current-recheck/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` exited 2 (`total=51 compiled=50 cached=0 skipped=0`). The four `time_module_state` errors are gone. The next distinct first blocker is `timemodule.c(1752)` C2143 before `type`, followed by C2275/C2146/C2065 for `TIME_ZONE_INFORMATION tzinfo` at 1762 and dependent errors. Later separate diagnostics include C2059 at 2103 and C2143/C2065 at 2205 onward. Left untouched for the next slice.

Verification: `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh` exited 0 (`ALL TESTS PASSED`); `git -C cpython diff --check -- Modules/timemodule.c` and `git diff --check -- scripts/vc6-probe-pythoncore-frontier.test.sh` exited 0. No linked `pythoncore.dll`/`python.exe`, Wine interpreter run, or Windows 98 SE execution. Files changed by this slice: `cpython/Modules/timemodule.c`, `scripts/vc6-probe-pythoncore-frontier.test.sh`, and this status log. Probe artifacts are under ignored `build/current-recheck/`. Next frontier: separately inspect and test-first address the first timezone-related declaration/compiler family at `timemodule.c` around line 1752; keep subsequent diagnostics separate.

---

## Previous revision (timemodule VC6/C89 ticks/ns declarations hoisted; fresh compiler blocked by Wine runtime directory)

Date: 2026-10-01 10:08 UTC

Continued from the recorded `timemodule.c` frontier after reading this status, `README.md`, and the CPython/Win9x/MSVC6 reference. Preserved all pre-existing outer and nested changes; no reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. CPython remains detached at baseline tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Used exactly one focused Codex coding-agent lane. The slice hoisted only `clock_t ticks` and `_PyTime_t ns` into `_PyTime_GetClockWithInfo`'s opening declaration group in `cpython/Modules/timemodule.c`; their initializers became assignments at the original points. No `time_module_state` or subsequent errors were changed.

TDD: appended an exact-body regression assertion to `scripts/vc6-probe-pythoncore-frontier.test.sh`, checking both declarations and the preserved function sequence. RED was observed before the source edit (exit 1, expected `AssertionError: _PyTime_GetClockWithInfo must hoist only ticks/ns and preserve initialization, info updates, clock/error checks, and conversion order`). GREEN after the source edit exited 0 and printed `ALL TESTS PASSED`.

Exact commands/results:

| Command | Exit/result |
|---|---|
| `env XDG_RUNTIME_DIR="$PWD/build/timemodule-clock-slice/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all bash scripts/vc6-probe-pythoncore-frontier.test.sh` (before source edit) | 1; expected RED assertion above. |
| Same command (after source edit) | 0; focused frontier regression suite `ALL TESTS PASSED`. |
| `bash scripts/vc6-probe.test.sh` | 1; Wine bootstrap failure, `wineserver: error creating /run/user/1000/wine/server-801-136fb0/lock: Read-only file system`; compile assertion not reached. |
| `bash scripts/vc6-probe-core.test.sh` | 1; same Wine runtime-directory failure across cases; no compiler diagnostics obtained. |
| `bash scripts/vc6-probe-stdint.test.sh` | 1; same Wine runtime-directory failure before compile. |
| `bash scripts/vc6-probe-pathcch.test.sh` | 1; same Wine runtime-directory failure before compile. |
| `bash scripts/generate-getpath-frozen.test.sh` | 0; all checks passed. |
| `env XDG_RUNTIME_DIR="$PWD/build/timemodule-clock-slice/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 1; wineserver failed creating its lock under `/run/user/1000/wine`; probe ended at `cpython/Modules/getpath.c`, `total=1 compiled=0 cached=0 skipped=0`. It never invoked the compiler on the source list and did not reach `timemodule.c`; no new compiler diagnostics can be claimed. |
| `git -C cpython diff --check -- Modules/timemodule.c` and `git diff --check -- scripts/vc6-probe-pythoncore-frontier.test.sh` | 0. Whole nested `git -C cpython diff --check` also exited 0. Whole outer `git diff --check` exited 2 due existing whitespace errors in the pre-existing generated compatibility patch; excluding that file, outer diff check exited 0. Generated patch left unchanged. |

Independent preservation verification compared entry-snapshot hashes for every pre-existing tracked/untracked file: all existing changes remain intact, and the only changes beyond that snapshot are this slice's `timemodule.c`, appended frontier assertion, and this log. Changed files this run: `cpython/Modules/timemodule.c`, `scripts/vc6-probe-pythoncore-frontier.test.sh`, and `PORT_STATUS.md`. Probe/test logs are under ignored `build/timemodule-clock-slice/`.

Compiler frontier advancement is unverified: Wine failed before compilation, so the expected `timemodule.c` diagnostics have not been freshly cleared. This is not a linked `pythoncore.dll`/`python.exe`, Wine interpreter, or Windows 98 SE result. Next action: restore a writable Wine runtime socket directory and rerun the forced-fresh source-list probe; if the two diagnostics clear, separately address the next `time_module_state` declaration family test-first.

---

## Latest revision (_PyTraceMalloc_NewReference declarations; frontier advances)

Date: 2026-10-01 08:01 UTC

Read `PORT_STATUS.md`, `README.md`, and `python-3-win9x-msvc6.md` before acting. Preserved every pre-existing outer and nested change; no reset, clean, stash, discard, commit, push, or publication. CPython remains detached at baseline tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. A forced fresh probe confirmed the recorded `_tracemalloc.c` frontier remained current and `_blake2/blake2s_impl.c` still compiles.

One narrow C89 slice in `cpython/Modules/_tracemalloc.c`: hoisted `uintptr_t ptr`, `PyTypeObject *type`, `int res`, and `trace_t *trace` into `_PyTraceMalloc_NewReference`'s initial declaration group. Assignment points, control flow, and `TABLES_LOCK()`/`TABLES_UNLOCK()` order are unchanged. Added a focused exact-body assertion in `scripts/vc6-probe-pythoncore-frontier.test.sh`. Used the installed Codex CLI as the single focused coding agent after checking its availability; its changes were independently diff-reviewed and re-tested.

Exact commands/results:

- `codex exec --sandbox workspace-write -C /home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x --ephemeral ...` — exit 0. The child first added the test, then ran RED before editing production source: `bash scripts/vc6-probe-pythoncore-frontier.test.sh` — exit 1, expected assertion `AssertionError: _PyTraceMalloc_NewReference must hoist ptr/type/res/trace into the initial C89 declaration group`, followed by `FAILED`.
- Child GREEN: `bash scripts/vc6-probe-pythoncore-frontier.test.sh` — exit 0, focused assertion passed and `ALL TESTS PASSED`.
- Independent syntax + regression run: `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh` — exit 0, all checks passed (`ALL TESTS PASSED`).
- Fresh compiler probe: `XDG_RUNTIME_DIR="$PWD/build/tracemalloc-slice/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2; `total=51 compiled=50 cached=0 skipped=0`. `_tracemalloc.c` now compiles past the prior `_PyTraceMalloc_NewReference` C89 diagnostics. First blocker advanced to `cpython/Modules/timemodule.c`: C2275/C2146/C2065 at line 164 (`clock_t ticks`), line 171 (`_PyTime_t ns`), and line 507 (`time_module_state state`); further errors occur at lines 549, 773, 969, 1746–1759, 2097, and 2199–2294. These remain untouched for a separate slice.
- `git -C cpython diff --check -- Modules/_tracemalloc.c` and `git diff --check -- scripts/vc6-probe-pythoncore-frontier.test.sh` — exit 0. Full diff inspection confirmed this run's only source/test files changed are `cpython/Modules/_tracemalloc.c` and `scripts/vc6-probe-pythoncore-frontier.test.sh`; all unrelated existing diffs were preserved.

Files changed by this slice: `cpython/Modules/_tracemalloc.c`, `scripts/vc6-probe-pythoncore-frontier.test.sh`, and this status log. The generated compatibility patch was deliberately not regenerated; its pre-existing synchronization/drift state remains unresolved. This is compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution was done.

Next frontier: one isolated, test-first C89 declaration slice in `cpython/Modules/timemodule.c`, beginning with its earliest diagnostics (`clock_t ticks`, `_PyTime_t ns`, and `time_module_state state`).

---

## Previous revision (_tracemalloc traceback lookup declarations; frontier advances)

Date: 2026-10-01 05:53 UTC

Continued from the recorded `_tracemalloc.c` frontier after reading this status, `README.md`, and the CPython/Win9x/MSVC6 reference. Preserved all pre-existing outer and nested changes; no reset, clean, stash, discard, commit, push, or publication. CPython remains at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`.

One narrow C89 slice in `cpython/Modules/_tracemalloc.c`: hoisted only `trace_t *trace` and `_Py_hashtable_t *traces` into `tracemalloc_get_traceback`'s opening declaration group. The table lookup remains inside the existing `TABLES_LOCK()` region. Added a focused exact-body assertion to `scripts/vc6-probe-pythoncore-frontier.test.sh`. Strict TDD was observed: the focused test first failed with the expected assertion before the source edit (exit 1), then passed after it (exit 0). The coding subagent was the installed authenticated Codex CLI; its diff was independently inspected and verified.

Exact commands/results:

- RED: `bash scripts/vc6-probe-pythoncore-frontier.test.sh > /tmp/tracemalloc-tdd/red.log 2>&1` — exit 1, expected `AssertionError: tracemalloc_get_traceback must hoist only trace/traces and preserve guarded, locked lookup order`.
- GREEN: `bash scripts/vc6-probe-pythoncore-frontier.test.sh > /tmp/tracemalloc-tdd/green.log 2>&1` — exit 0, `ALL TESTS PASSED`. Repeated directly after the probe with `bash scripts/vc6-probe-pythoncore-frontier.test.sh` — exit 0, `ALL TESTS PASSED`. `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh` — exit 0.
- Initial forced probe without a writable Wine runtime directory: exit 1 before compilation (`sock_init: ERROR in sock_check_pollhup()`; wineserver could not create its lock under read-only `/run/user/1000`; total=1, compiled=0). Retried using writable workspace runtime directory: `XDG_RUNTIME_DIR="$PWD/build/tracemalloc-slice/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2, fresh `total=49 compiled=48 cached=0 skipped=0`. `_tracemalloc.c` now compiles past the prior `tracemalloc_get_traceback` diagnostics (C2275/C2065 at lines 1454/1456 are cleared). First stable remaining errors are separate C89 declarations in `_tracemalloc.c` at lines 1816–1834: C2275/C2146/C2065 (`uintptr_t ptr`), C2275/C2065 (`PyTypeObject type`), C2143 around line 1825, C2275/C2065 (`trace_t trace`), C2223 on `trace->traceback`, and C2065 (`res`). They are left untouched for a separate slice.
- `git -C cpython diff --check` and outer `git diff --check` excluding the generated compatibility patch — exit 0. `cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` — exit 1, confirming pre-existing generated-patch drift; the patch was not regenerated or modified by this slice. Baseline/tag unchanged. Existing outer changes to `PORT_STATUS.md`, compatibility files, fixture, and test script were preserved.

Files changed by this slice: `cpython/Modules/_tracemalloc.c`, `scripts/vc6-probe-pythoncore-frontier.test.sh`, and this status log. Probe artifacts are under ignored `build/tracemalloc-slice/`. This remains compiler-probe progress only: no `pythoncore`/`python.exe` link, Wine interpreter run, or Windows 98 SE execution.

Next frontier: separately hoist the C89 locals in `_PyTraceMalloc_Track` (the diagnostics around lines 1816–1834), preserving the existing type-check, traceback allocation, and result/error order.

---

## Previous latest revision (_tracemalloc get-traces declaration slice; VC6 frontier advances)

Date: 2026-10-01 03:41 UTC

One isolated C89 slice in `cpython/Modules/_tracemalloc.c`: hoisted only `int err` to the opening declaration group of `_tracemalloc__get_traces_impl`; its assignment remains after `set_reentrant(1)`. Added focused assertions in `scripts/vc6-probe-pythoncore-frontier.test.sh` for declaration placement and traversal/reentrancy/error-check order. Preserved preceding user edits; used one focused Codex coding subagent after the native delegation tool failed because the Anthropic dependency is missing. No reset, clean, stash, discard, commit, push, or compatibility-patch regeneration. Nested HEAD is `41388c9cb160d0886d5ca00d2e6c878260a8a4549`, matching the recorded baseline.

Exact commands/results:

- RED: `bash scripts/vc6-probe-pythoncore-frontier.test.sh > build/tracemalloc-slice/red.log 2>&1` — exit 1, `tracemalloc get-traces must declare err before statements for VC6`, followed by `FAILED`, before production edit.
- Prepared workspace-local Wine prefix with `cp -a /home/ubuntu/.wine-win9xport build/tracemalloc-slice/wineprefix` (exit 0).
- Forced probe with the established user prefix: `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2, fresh `total=49 compiled=48 cached=0 skipped=0`. `_tracemalloc.c` compiled past the original line-1410/1413 `err` blocker. First stable remaining diagnostics are C2275/C2065 at line 1454 (`trace_t trace`) and line 1456 (`_Py_hashtable_t *traces`) in `tracemalloc_get_traceback`; later mixed declarations remain at lines 1815–1833. This is compiler-probe progress only.
- Focused regressions: `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all bash scripts/vc6-probe-pythoncore-frontier.test.sh` — exit 0, `ALL TESTS PASSED`. `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` — exit 0; every named suite passed (`ALL TESTS PASSED`).
- `git -C cpython diff --check` and `git diff --check -- . ':(exclude)compat/msvc600/cpython-3.11.16-vc6-headers.patch'` — exit 0. `cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` returned exit 1, confirming existing generated-patch drift; patch left untouched. No rebuild of the patch was attempted.

Files changed in this slice: `cpython/Modules/_tracemalloc.c`, `scripts/vc6-probe-pythoncore-frontier.test.sh`, `PORT_STATUS.md`; local verification artifacts in ignored `build/`. Source delta against the entry snapshot is exactly one added declaration and removal of `int` at the original assignment.

Next frontier: C89-hoist `trace_t *trace` and `_Py_hashtable_t *traces` in `tracemalloc_get_traceback` in a separate test-first slice, preserving the table lookup under the existing lock. Later C89 errors around line 1815 remain separate. The original `err` diagnostic family is cleared by the fresh compiler probe. No linked `pythoncore`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution was performed.

---

## Latest revision (signalmodule Windows wakeup initializer cleared; signalmodule remains blocked)

Date: 2026-10-01 01:34 UTC

Continued from the fresh `signalmodule.c` frontier, preserving all existing outer and nested CPython work. No reset, clean, stash, discard, commit, push, or publication. CPython remains detached at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`.

One narrow C89 compatibility slice: changed only the `MS_WINDOWS` `wakeup` aggregate initializer in `Modules/signalmodule.c` from designated fields to `{INVALID_FD, 1, 0}`, retaining declared field order and values; non-Windows initializer unchanged. Added a focused test in `scripts/vc6-probe-pythoncore-frontier.test.sh`. The new assertion was verified RED against pristine nested `HEAD` (`git show HEAD:Modules/signalmodule.c` input; assertion failed with the expected message, exit 1), then GREEN with the updated working source as part of the frontier regression suite (exit 0). Native Hermes delegation was unavailable because its Anthropic dependency is absent; used installed Codex CLI in the existing checkout and independently inspected/tested its narrow diff.

Forced fresh VC6 frontier probe after the edit: exit 2, `total=45 compiled=44 cached=0 skipped=0`. `signalmodule.c` still fails, but the Windows wakeup designated-initializer C2059 at line 118 is gone. Remaining first stable diagnostic is C2079 at `Modules/socketmodule.h(268)` (`bt_rc` uses undefined `SOCKADDR_BTH_REDEF`), followed by signalmodule C89 errors including C2143/C2065 at lines 315/318 (`interp`); numerous further C89/type errors remain. This is compile-probe progress only: no `pythoncore`/`python.exe` link, Wine interpreter run, or Windows 98 SE execution.

Exact verification:

| Command | Result |
|---|---|
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | Exit 2; fresh compile 44/45, zero cached; signalmodule still blocked as above, designated initializer diagnostic cleared. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | Exit 0; all applicable regression suites passed. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch`; `cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | Exit 0; patch matches full nested diff byte-for-byte. |
| Apply refreshed patch to pristine archive of baseline `HEAD`, then compare all changed files | Exit 0; patch applies and all 68 changed CPython files match nested working tree. |
| Nested and outer `git diff --check` | Exit 0. |

Files changed in this slice: `cpython/Modules/signalmodule.c`, `scripts/vc6-probe-pythoncore-frontier.test.sh`, regenerated `compat/msvc600/cpython-3.11.16-vc6-headers.patch`, and `PORT_STATUS.md`. All earlier edits remain preserved. Next frontier: investigate the socket-header `SOCKADDR_BTH_REDEF` definition/guard in context, then separately address C89 diagnostics in `signalmodule.c` with their own focused regression slice.

---

## Latest revision (sha256module blockers cleared; sha512module next)

Date: 2026-10-01 01:14 UTC

Continued from the verified `sha256module.c` frontier without discarding or resetting any outer or nested work. No commit or push. CPython remains at detached `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`.

In `Modules/sha256module.c`, changed both SHA224/SHA256 `PyType_Spec` records to declared positional order (including `itemsize = 0`), hoisted `state` and `new` into C89 declaration groups in both constructors while leaving state lookup after buffer acquisition, and changed `_sha256module` to positional `PyModuleDef` fields with an explicit `NULL` doc slot. Added a test-first regression for the type specs, declaration placement/order, and module initializer; it failed before the changes and passed afterward.

Forced fresh compile-frontier result: exit 2, `total=44 compiled=43 cached=0 skipped=0`. `sha256module.c` now compiles. The next blocker is `cpython/Modules/sha512module.c`: VC6 reports bad numeric suffixes and illegal `long long` at lines 132, 145, and 146. No interpreter has been linked or runtime-tested.

Verification: `scripts/vc6-probe-pythoncore-frontier.test.sh` passed; `git -C cpython diff --check` and outer diff checks excluding the generated patch passed. The refreshed compatibility patch applies to pristine CPython `v3.11.16` and all 67 changed CPython files match the nested working tree. No commit or push.

Files changed in this slice: `cpython/Modules/sha256module.c`, `scripts/vc6-probe-pythoncore-frontier.test.sh`, `compat/msvc600/cpython-3.11.16-vc6-headers.patch`, and this status log.

---

## Latest revision (sha1module blockers cleared; sha256module next)

Date: 2026-10-01 00:58 UTC

Continued from the verified `sha1module.c` frontier. Preserved existing outer/nested work; no reset, clean, stash, discard, commit, or push. CPython remains detached at `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`.

In `Modules/sha1module.c`, changed `SHA1_INT64` to `PY_LONG_LONG` (the VC6 configuration maps this to `__int64`), converted `sha1_type_spec` to positional `PyType_Spec` field order, hoisted `st` into `_sha1_sha1_impl`'s C89 declaration group while retaining assignment after buffer acquisition, and converted `_sha1module` to positional `PyModuleDef` fields with a `NULL` doc slot. Added test-first regression assertions; the test failed before these changes and passed afterward.

Forced fresh compile-frontier result: exit 2, `total=43 compiled=42 cached=0 skipped=0`. Both `posixmodule.c` and `sha1module.c` now compile. The frontier moved to `cpython/Modules/sha256module.c`: designated-initializer errors at lines 562 and 570, followed by C89 declaration errors at lines 599 and 645, then cascading diagnostics. This is compile-only; no interpreter link or Win9x runtime test.

Verification: `scripts/vc6-probe-pythoncore-frontier.test.sh` passed with the new SHA1 checks. `git -C cpython diff --check` and outer diff checks excluding the generated patch passed. The refreshed compatibility patch applies to pristine CPython `v3.11.16`; all 66 changed CPython files match the nested working tree. No commit or push.

Files changed in this slice: `cpython/Modules/sha1module.c`, `scripts/vc6-probe-pythoncore-frontier.test.sh`, `compat/msvc600/cpython-3.11.16-vc6-headers.patch`, and this status log.

---

## Latest revision (posixmodule C89 and PyModuleDef blockers cleared; sha1module next)

Date: 2026-10-01 00:49 UTC

Continued from the verified `posixmodule.c` frontier. Preserved all existing outer and nested changes; no reset, clean, stash, discard, commit, or push. CPython remains at detached `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`.

In `posixmodule_exec`, hoisted `ScandirIteratorType`, `list`, and `trace` into the opening C89 declaration group, leaving their assignments and traversal order unchanged. Replaced the `posixmodule` C99 designated `PyModuleDef` initializer with positional fields matching `struct PyModuleDef` declaration order in `Include/moduleobject.h`. Added test-first regression assertions for both changes; the new initializer test failed before the conversion and passed after.

Forced fresh compile-frontier result: exit 2, `total=42 compiled=41 cached=0 skipped=0`. `posixmodule.c` now compiles cleanly. The first blocker moved to `cpython/Modules/sha1module.c`: C2632 at line 36 (`long` followed by `long` is illegal). Later diagnostics in that file include C2059 at line 476 (designated initializer), C2143/C2065 around lines 505–506 (`st`), and C2059 at line 591. These are the next work items; the current first blocker is the 64-bit type spelling at line 36.

Verification: `scripts/vc6-probe-pythoncore-frontier.test.sh`, `vc6-probe.test.sh`, `vc6-probe-core.test.sh`, `vc6-probe-pathcch.test.sh`, `generate-getpath-frozen.test.sh`, and `vc6-probe-stdint.test.sh` all passed. `git -C cpython diff --check` and outer diff checks excluding the generated patch passed. The generated compatibility patch applies to pristine CPython `v3.11.16` and its 65 changed files match the nested working tree. This remains compile-only: no interpreter link or Win9x runtime test.

Files changed in this slice: `cpython/Modules/posixmodule.c`, `scripts/vc6-probe-pythoncore-frontier.test.sh`, `compat/msvc600/cpython-3.11.16-vc6-headers.patch`, and this status log. No commit or push.

---

## Latest revision (VC6 LoadLibrary flag definitions added; posixmodule C89 frontier next)

Date: 2026-09-30 23:54 UTC

Read `PORT_STATUS.md`, `README.md`, and the CPython/Win9x/MSVC6 references before editing. Preserved all prior outer and nested modifications; no reset, clean, stash, discard, commit, or push. CPython baseline remains detached at `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`.

Resolved the missing-identifier compile family in `posixmodule.c`: added `Include/internal/pycore_win9x_loadlibrary.h`, included after `<windows.h>` in `Modules/posixmodule.c` and `Python/dynload_win.c`, and supplied guarded documented values for the five `LOAD_LIBRARY_SEARCH_*` constants when compiling with `_MSC_VER < 1300`. Microsoft documents these flag values for newer Windows loaders; they do not add those loader semantics to Windows 9x (the newer flags require an update even on certain Vista/Windows 7 releases; see https://learn.microsoft.com/en-us/windows/win32/api/libloaderapi/nf-libloaderapi-loadlibraryexw). This is compile-time header compatibility only. Runtime loader fallback remains required before claiming a working Win9x interpreter.

Added a regression check to `scripts/vc6-probe-pythoncore-frontier.test.sh`. Confirmed RED when the compatibility header was absent; after adding the guarded definitions and including them in both consumers, the full frontier regression script passed.

A forced fresh source-list probe now compiles 39/40 sources with zero cached objects. `posixmodule.c` itself is reached and the five `LOAD_LIBRARY_SEARCH_*` C2065 errors are gone. The probe still exits 2: the first remaining diagnostics are C2275 for `PyObject` and C2065 for `ScandirIteratorType` at line 16174. Further separate C89 errors begin at line 16221 (`list`), line 16225 (`trace`), and line 16247 (`.`). These remain untouched; current compile frontier has moved, not completed.

Verification:

| Command | Result |
|---|---|
| `bash -n scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh` | 0; all checks passed, including the new flag-definition test. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; fresh compile 39/40, zero cached; flag errors cleared; first blocker advanced to C89 diagnostics in `posixmodule.c`. |
| `bash -n` on the frontier/probe/regression scripts, then `vc6-probe.test.sh`, `vc6-probe-core.test.sh`, `vc6-probe-pathcch.test.sh`, `generate-getpath-frozen.test.sh`, `vc6-probe-stdint.test.sh`, and `git diff --check` | 0; all applicable suites and whitespace checks passed. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all bash scripts/vc6-probe-core.sh cpython/Python/dynload_win.c` | 2; direct probe is incomplete because it omits the project `PY3_DLLNAME` define and also encounters C89 diagnostics; no `LOAD_LIBRARY_SEARCH_*` errors appeared. This is not a valid full `dynload_win.c` build result. |
| Generated compatibility patch `compat/msvc600/cpython-3.11.16-vc6-headers.patch`; `git apply --check` and apply to pristine `v3.11.16` archive, then byte-compare all changed files | Passed; all 65 patched files matched the nested working tree. |

Files changed for this slice: `Include/internal/pycore_win9x_loadlibrary.h`, `Modules/posixmodule.c`, `Python/dynload_win.c`, `scripts/vc6-probe-pythoncore-frontier.test.sh`, and the generated outer compatibility patch. No interpreter was linked or run; no Windows 98 SE execution was attempted.

---

## Latest revision (scheduled forced fresh VC6 frontier recheck; posixmodule remains blocker)

Date: 2026-09-30 21:18 UTC

Read `PORT_STATUS.md`, `README.md`, and the CPython/Win9x/MSVC6 reference before acting. Preserved all pre-existing outer and nested changes; no reset, clean, stash, discard, unrelated overwrite, commit, push, or publication. CPython remains detached at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Re-probed the active frontier rather than resuming the stale `_blake2/blake2s_impl.c` note: that source still compiles, while `posixmodule.c` remains the first blocker. The Win9x-visible contract for the five exported loader-search constants is not established, so no speculative implementation or coding subagent was appropriate.

Forced fresh probe compiled 39/40 sources (`total=40 compiled=39 cached=0 skipped=0`). First stable diagnostics: C2065 at `posixmodule.c(15856)`–`(15860)` for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. Separate later C89 diagnostics begin at 16173 (`ScandirIteratorType`), 16220 (`list`), 16224 (`trace`), and 16246; untouched.

Files changed this run: `PORT_STATUS.md` only. All prior outer changes and nested CPython changes remain preserved.

Exact commands/results:

| Command | Exit/result |
|---|---|
| `git -C cpython status --short --branch; git -C cpython rev-parse HEAD; git -C cpython describe --tags --exact-match; git status --short --branch; date -u '+%Y-%m-%d %H:%M UTC'` | 0; baseline/tag unchanged, existing edits preserved; timestamp `2026-09-30 21:18 UTC`. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; forced fresh compile 39/40, zero cached; first stable errors are five C2065 identifiers above; compiler exit 2, first blocker `cpython/Modules/posixmodule.c`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; syntax and all applicable regression suites passed (`ALL TESTS PASSED`). |
| `git -C cpython diff --check && cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch && git diff --check -- . ':(exclude)compat/msvc600/cpython-3.11.16-vc6-headers.patch'` | 0; nested and outer whitespace checks passed; patch matches complete nested diff byte-for-byte. |

Compiler-probe progress only. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution verified. Next frontier: establish authoritative intended Win9x behavior for the five exported constants, then add a focused failing test before a narrow source change; keep later C89 diagnostics separate.

---

## Latest revision (scheduled forced fresh VC6 frontier recheck; posixmodule remains blocker)

Date: 2026-09-30 19:13 UTC

Read `PORT_STATUS.md`, `README.md`, and the active-profile CPython/Win9x/MSVC6 reference before acting. Preserved all existing outer and nested changes; no reset, clean, stash, discard, unrelated overwrite, commit, push, or publication. CPython remains detached at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Re-probed the actual frontier rather than returning to the earlier `_blake2/blake2s_impl.c` sequence: that source still compiles, and `posixmodule.c` is still the first blocker. No compatibility implementation was safe because the Win9x-visible contract for the five exported loader-search constants remains unestablished; this was diagnostic-only, so no coding subagent was used.

The forced-fresh probe compiled 39/40 sources (`total=40 compiled=39 cached=0 skipped=0`). First stable errors: C2065 at `posixmodule.c(15856)`–`(15860)` for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. Separate later C89 diagnostics begin at line 16173 (`ScandirIteratorType`), then line 16220 (`list`), line 16224 (`trace`), and line 16246; left untouched. The probe returned 2, with `cl.exe exit status: 2` and `first compile blocker: cpython/Modules/posixmodule.c`.

Files changed this run: `PORT_STATUS.md` only. Existing outer patch/test changes and all nested CPython edits were preserved.

Exact commands/results:

| Command | Exit/result |
|---|---|
| `date -u '+%Y-%m-%d %H:%M UTC'; git status --short --branch; git -C cpython status --short --branch; git -C cpython rev-parse HEAD; git -C cpython describe --tags --exact-match` | 0; timestamp `2026-09-30 19:13 UTC`; baseline/tag unchanged and existing modifications preserved. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; 39/40 compiled, zero cached; first diagnostics and later distinct C89 family as above. `_blake2/blake2s_impl.c` compiled successfully. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; shell syntax and all applicable suites passed (`ALL TESTS PASSED`). |
| `git -C cpython diff --check && cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch && git diff --check -- . ':(exclude)compat/msvc600/cpython-3.11.16-vc6-headers.patch'` | 0; both diff checks passed and compatibility patch matches the complete nested diff byte-for-byte. |

Compiler-probe progress only. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution verified. Next frontier: establish authoritative intended Win9x behavior for the five loader-search constants, then write a focused failing test before a narrow source change. Keep the later C89 diagnostics separate.

---

## Previous latest revision (scheduled forced fresh VC6 frontier recheck; posixmodule remains blocker)

Date: 2026-09-30 15:05 UTC

Read `PORT_STATUS.md`, `README.md`, and the active-profile legacy-toolchain reference before acting. Preserved all existing outer and nested changes; no reset, clean, stash, discard, unrelated overwrite, commit, push, or publication. CPython remains detached at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Re-probed rather than assuming the earlier `_blake2/blake2s_impl.c` note was the current frontier: it still compiles, while `posixmodule.c` remains the first blocker. Since the unresolved loader-search constants are still the first error family and their intended Win9x-visible exported API behavior is not established, this run made no speculative source/test change and did not delegate implementation.

The forced fresh probe compiled 39/40 listed sources (`total=40 compiled=39 cached=0 skipped=0`). First stable errors are C2065 at `posixmodule.c(15856)`–`(15860)` for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. Distinct later C89 diagnostics begin at line 16173 (`ScandirIteratorType`), then 16220 (`list`), 16224 (`trace`), and 16246; none changed.

Files changed this run: `PORT_STATUS.md` only. Pre-existing outer compatibility patch/test edits and all nested CPython changes were preserved.

Exact commands/results:

| Command | Exit/result |
|---|---|
| `git -C cpython status --short --branch; git -C cpython rev-parse HEAD; git -C cpython describe --tags --exact-match; date -u '+%Y-%m-%d %H:%M UTC'; git status --short --branch` | 0; nested modifications preserved; baseline/tag unchanged; timestamp `2026-09-30 15:05 UTC`. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; fresh compile-only probe compiled 39/40 with zero cached sources; first stable errors are the five C2065 constants above; subsequent C89 diagnostics remain distinct. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; syntax checks and all applicable regression suites passed (`ALL TESTS PASSED`). |
| `git -C cpython diff --check; cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch; git diff --check -- . ':(exclude)compat/msvc600/cpython-3.11.16-vc6-headers.patch'` | 0; nested and outer diff checks passed and compatibility patch byte-matches the complete nested diff. |

Compiler-probe progress only. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution verified. Next frontier: establish authoritative intended Win9x behavior for the five exported loader-search constants, then add a focused failing test before a narrow implementation; keep the later C89 blockers separate.

---

The forced fresh probe compiled 39/40 listed sources (`total=40 compiled=39 cached=0 skipped=0`). `_blake2/blake2s_impl.c` compiled successfully. First stable errors: C2065 at `posixmodule.c(15856)`–`(15860)` for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. Separate subsequent C89 errors begin at line 16173 (`ScandirIteratorType`), line 16220 (`list`), line 16224 (`trace`), and line 16246; these remain untouched.

Files changed this run: `PORT_STATUS.md` only. All pre-existing outer and nested CPython changes were preserved.

Exact commands/results:

| Command | Exit/result |
|---|---|
| `git -C cpython status --short --branch && git -C cpython rev-parse HEAD && git -C cpython describe --tags --exact-match && date -u '+%Y-%m-%d %H:%M UTC'` | 0; nested modifications preserved; baseline/tag unchanged; `2026-09-30 13:01 UTC`. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; forced fresh probe compiled 39/40 with zero cached sources. First stable diagnostics are the five C2065 constants above; later C89 diagnostics remain distinct. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; all applicable regression suites passed (`ALL TESTS PASSED`). |

Compiler-probe progress only. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution was verified. Next frontier: establish authoritative Win9x behavior for the five exported loader-search constants, then add a focused failing test before a narrow implementation change. Keep the later C89 diagnostics separate.

---

Date: 2026-09-30 04:45 UTC

Read `PORT_STATUS.md`, `README.md`, and the legacy-toolchain reference before probing. Preserved all pre-existing outer and nested modifications; no reset, clean, stash, discard, unrelated overwrite, commit, push, or publication. CPython remains detached at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Forced fresh probe confirms `_blake2/blake2s_impl.c` still compiles and is not the active frontier. The first blocker remains five undeclared `LOAD_LIBRARY_SEARCH_*` constants in `posixmodule.c`; the Win9x-visible API contract remains unresolved, so no speculative implementation or coding subagent was appropriate.

Probe compiled 39/40 sources (`total=40 compiled=39 cached=0 skipped=0`). First stable diagnostics are C2065 at `posixmodule.c(15856)`–`(15860)` for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. Distinct later C89 diagnostics begin at line 16173 (`ScandirIteratorType`), then line 16220 (`list`), line 16224 (`trace`), and line 16246. No production source or regression test was changed.

Files changed this run: `PORT_STATUS.md` only. Existing outer compatibility patch/test modifications and all nested CPython modifications were preserved.

Exact commands/results:

| Command | Exit/result |
|---|---|
| `git status --short --branch; git -C cpython status --short --branch; git -C cpython rev-parse HEAD; git -C cpython describe --tags --exact-match; date -u '+%Y-%m-%d %H:%M UTC'` | 0; pre-existing modifications preserved; baseline/tag unchanged; `2026-09-30 04:45 UTC`. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; fresh run compiled 39/40 with zero cached sources. First stable errors are the five C2065 constants above; later distinct C89 diagnostics remain. Full output: `/home/ubuntu/.hermes/profiles/maxwell/cache/scratch/frontier-current.log`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; all applicable regression suites passed (`ALL TESTS PASSED`). |
| `git -C cpython diff --check; cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch; git diff --check -- . ':(exclude)compat/msvc600/cpython-3.11.16-vc6-headers.patch'` | 0; nested/outer diff checks passed and generated patch byte-matches the full nested diff. |

Compiler-probe progress only. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution verified. Next frontier: resolve authoritative intended Win9x behavior for the five exported constants, then add a focused failing test before a narrow change. Keep later C89 diagnostics separate.

---

## Latest revision (forced fresh frontier recheck; posixmodule loader constants remain blocker)

Date: 2026-09-30 00:40 UTC

Read `PORT_STATUS.md`, `README.md`, and `python-3-win9x-msvc6.md` before probing. Preserved all pre-existing outer and nested modifications; no reset, clean, stash, discard, unrelated overwrite, commit, push, or publication. CPython remains detached at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. The recorded `_blake2/blake2s_impl.c` state remains true, but is not the active frontier. Forced fresh probe reconfirmed `posixmodule.c` as the first blocker. This run was diagnostic-only: the intended Win9x-visible contract for the five exported loader-search constants is still unresolved, so no compatibility source/test edit or coding subagent was appropriate.

The forced fresh probe compiled 39/40 listed sources (`total=40 compiled=39 cached=0 skipped=0`), including `_blake2/blake2s_impl.c`. First stable diagnostics are C2065 at `posixmodule.c(15856)`–`(15860)` for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. Separate later C89 diagnostics begin at line 16173 (`ScandirIteratorType`), then line 16220 (`list`), 16224 (`trace`), and line 16246; left untouched.

Files changed this run: `PORT_STATUS.md` only. Existing outer patch/test edits and all nested CPython changes were preserved.

Exact commands/results:

| Command | Exit/result |
|---|---|
| `date -u '+%Y-%m-%d %H:%M UTC'; git -C cpython rev-parse HEAD; git -C cpython describe --tags --exact-match; git -C cpython status --short --branch` | 0; timestamp `2026-09-30 00:40 UTC`; baseline/tag unchanged; existing nested edits preserved. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; forced fresh probe compiled 39/40 with zero cached sources; exact first stable errors are the five C2065 constants above; later distinct C89 diagnostics remain. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; shell syntax and all applicable regression suites passed (`ALL TESTS PASSED`). |
| `git diff --check -- . ':(exclude)compat/msvc600/cpython-3.11.16-vc6-headers.patch'; git -C cpython diff --check; cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | 0; outer/nested whitespace checks passed and tracked compatibility patch byte-matches the complete nested diff. |

Compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution verified. Next frontier: establish authoritative intended Win9x behavior for the five exported loader-search constants; then add a focused failing test before a narrow change. Keep later C89 diagnostics separate.

---

## Latest revision (forced fresh VC6 frontier recheck; loader-search constants remain first blocker)

Date: 2026-09-29 22:33 UTC

Read `PORT_STATUS.md`, `README.md`, and the CPython 3.11.16/Win9x/MSVC6 reference before probing. Preserved all existing outer and nested modifications; no reset, clean, stash, discard, unrelated overwrite, commit, push, or publication. CPython remains detached at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. The recorded `_blake2/blake2s_impl.c` state remains true, but it is not the active frontier. Forced fresh probe reconfirmed `posixmodule.c` as first blocker, so this run was diagnostic-only; the Win9x API contract for its five exported loader-search constants remains unresolved. No implementation subagent or source/test edit was appropriate.

The fresh probe compiled 39/40 listed sources (`total=40 compiled=39 cached=0 skipped=0`), including `_blake2/blake2s_impl.c`. First stable diagnostics: C2065 at `posixmodule.c(15856)`–`(15860)` for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. Separate later C89 diagnostics begin at line 16173 (`ScandirIteratorType`), followed by line 16220 (`list`), 16224 (`trace`), and line 16246; left untouched.

Files changed this run: `PORT_STATUS.md` only. Existing outer patch/test edits and all nested CPython changes were preserved.

Exact commands/results:

| Command | Exit/result |
|---|---|
| `git status --short --branch; git -C cpython rev-parse HEAD; git -C cpython describe --tags --exact-match; git -C cpython status --short --branch; date -u '+%Y-%m-%d %H:%M UTC'` | 0; existing modifications preserved; CPython baseline/tag unchanged; timestamp `2026-09-29 22:33 UTC`. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; forced fresh probe compiled 39/40, zero cached; exact first errors are the five C2065 loader-search constants above; later distinct C89 diagnostics remain. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; syntax checks and all applicable regression suites passed (`ALL TESTS PASSED`). |
| `git -C cpython diff --check && cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch && git diff --check -- . ':(exclude)compat/msvc600/cpython-3.11.16-vc6-headers.patch'` | 0; nested/outer diff checks passed; generated compatibility patch matches the complete nested diff byte-for-byte. |

Compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution verified. Next frontier: establish authoritative intended Win9x behavior for the five exported loader-search constants; then add a focused failing test before any source edit. Keep later C89 diagnostics separate.

---

## Previous revision (scheduled forced fresh VC6 frontier recheck; loader-search constants remain first blocker)

Date: 2026-09-29 20:29 UTC

Read `PORT_STATUS.md`, `README.md`, and the active-profile CPython 3.11.16/Win9x/MSVC6 reference before probing. Preserved all existing outer and nested modifications; no reset, clean, stash, discard, unrelated overwrite, commit, push, or publication. CPython remains detached at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. `_blake2/blake2s_impl.c` still compiles and is not the active frontier. A forced fresh probe reconfirmed `posixmodule.c` as the first blocker. The Win9x API contract for its five exported loader-search constants remains unresolved, so this run was diagnostic-only; no implementation subagent or source/test edit was appropriate.

The probe compiled 39/40 listed sources (`total=40 compiled=39 cached=0 skipped=0`), including `_blake2/blake2s_impl.c`. First stable diagnostics are C2065 at `posixmodule.c(15856)`–`(15860)` for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. Separate later C89 diagnostics begin at line 16173 (`ScandirIteratorType`), followed by line 16220 (`list`), 16224 (`trace`), and line 16246; left untouched.

Files changed this run: `PORT_STATUS.md` only. Existing outer patch/test edits and all nested CPython changes were preserved.

Exact commands/results:

| Command | Exit/result |
|---|---|
| `git status --short --branch; git -C cpython status --short --branch; git -C cpython rev-parse HEAD; git -C cpython describe --tags --exact-match; date -u '+%Y-%m-%d %H:%M UTC'` | 0; existing outer and nested edits preserved; baseline/tag unchanged; timestamp `2026-09-29 20:29 UTC`. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; forced fresh probe compiled 39/40 with zero cached sources. First stable errors are the five C2065 loader-search constants listed above; later distinct C89 errors remain. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; all applicable regression tests and shell syntax checks passed (`ALL TESTS PASSED`). |
| `git -C cpython diff --check && cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch && git diff --check -- . ':(exclude)compat/msvc600/cpython-3.11.16-vc6-headers.patch'` | 0; nested and outer diff checks passed; generated compatibility patch matches the complete nested diff byte-for-byte. |

Compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution verified. Next frontier: establish authoritative intended Win9x behavior for the five exported loader-search constants; then add a focused failing test before any source edit. Keep later C89 diagnostics separate.

---

## Previous revision (scheduled forced fresh VC6 frontier recheck; loader-search constants remain first blocker)

Date: 2026-09-29 18:25 UTC

Read `PORT_STATUS.md`, `README.md`, and the CPython 3.11.16/Win9x/MSVC6 reference before probing. Preserved all pre-existing outer and nested modifications; no reset, clean, stash, discard, unrelated overwrite, commit, push, or publication. CPython remains detached at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. `_blake2/blake2s_impl.c` still compiles and is not the active frontier. A forced fresh probe reconfirmed `posixmodule.c` as first blocker. The Win9x API contract for its five exported loader-search constants remains unresolved, so this was diagnostic-only; no implementation subagent or source/test edit was appropriate.

The probe compiled 39/40 listed sources (`total=40 compiled=39 cached=0 skipped=0`), including `_blake2/blake2s_impl.c`. First stable diagnostics are C2065 at `posixmodule.c(15856)`–`(15860)` for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. Separate later C89 diagnostics begin at line 16173 (`ScandirIteratorType`), followed by line 16220 (`list`), 16224 (`trace`), and line 16246; left untouched.

Files changed this run: `PORT_STATUS.md` only. Existing outer patch/test edits and all nested CPython changes were preserved.

Exact commands/results:

| Command | Exit/result |
|---|---|
| `git status --short --branch; git -C cpython status --short --branch; git -C cpython rev-parse HEAD; git -C cpython describe --tags --exact-match; date -u '+%Y-%m-%d %H:%M UTC'` | 0; existing outer and nested edits preserved; baseline/tag unchanged; timestamp `2026-09-29 18:25 UTC`. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; forced fresh probe compiled 39/40 with zero cached sources. First stable errors are the five C2065 loader-search constants listed above; later distinct C89 errors remain. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; all applicable regression tests and shell syntax checks passed (`ALL TESTS PASSED`). |

Compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution verified. Next frontier: establish authoritative intended Win9x behavior for the five exported loader-search constants; then add a focused failing test before any source edit. Keep later C89 diagnostics separate.

---

## Previous revision (scheduled forced fresh VC6 frontier recheck; loader-search constants remain first blocker)

Read `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before probing. Preserved all pre-existing outer and nested modifications; no reset, clean, stash, discard, unrelated overwrite, commit, push, or publication. CPython remains detached at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. `_blake2/blake2s_impl.c` compiles, but is not the active frontier. The forced fresh probe reconfirmed `posixmodule.c` as the first blocker. The intended Win9x API contract for the five exported loader-search constants remains unresolved, so no source/test edit or implementation subagent was appropriate.

The forced fresh probe compiled 39/40 listed sources (`total=40 compiled=39 cached=0 skipped=0`), including `_blake2/blake2s_impl.c`. First stable errors: C2065 at `posixmodule.c(15856)`–`(15860)` for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. Separate later C89 diagnostics start at line 16173 (`ScandirIteratorType`), followed by errors at 16220 (`list`), 16224 (`trace`), and 16246; left untouched.

Files changed this run: `PORT_STATUS.md` only. Existing outer compatibility-patch and frontier-test changes and all nested CPython modifications were preserved.

Exact commands/results:

|| Command | Exit/result |
||---|---|
|| `git status --short --branch; git rev-parse HEAD; git -C cpython status --short --branch; git -C cpython rev-parse HEAD; git -C cpython describe --tags --exact-match; date -u '+%Y-%m-%d %H:%M UTC'` | 0; existing changes preserved; CPython baseline/tag unchanged; timestamp `2026-09-29 16:20 UTC`. |
|| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; forced fresh probe compiled 39/40, zero cached; exact first errors are the five C2065 loader-search constants above; separate C89 errors follow. |
|| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; all applicable syntax checks and regression suites passed (`ALL TESTS PASSED`). |
|| `git -C cpython diff --check && cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch && git diff --check -- . ':(exclude)compat/msvc600/cpython-3.11.16-vc6-headers.patch'` | 0; nested and outer diff checks passed; generated compatibility patch matches the complete nested diff byte-for-byte. |

Compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution verified. Next frontier: establish authoritative intended Win9x behavior for the five exported loader-search constants, then add a focused failing test before any source edit. Keep later C89 diagnostics separate.

---

---

## Previous revision (scheduled forced fresh VC6 frontier recheck; loader-search constants remain first blocker)

Date: 2026-09-29 10:08 UTC

Read `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before probing. Preserved all existing outer and nested changes. No reset, clean, stash, discard, overwrite of unrelated work, commit, push, or publication. CPython remains detached at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. `_blake2/blake2s_impl.c` still compiles but is not the active frontier. The forced fresh source-list probe reconfirmed `posixmodule.c` as the first blocker; the intended Win9x API contract for the five exported loader-search constants is unresolved, so this was diagnostic-only and no coding subagent or implementation change was appropriate.

The probe compiled 39/40 listed sources (`total=40 compiled=39 cached=0 skipped=0`), including `_blake2/blake2s_impl.c`. First stable diagnostics: C2065 at `posixmodule.c(15856)`–`(15860)` for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. Separate subsequent C89 diagnostics start at line 16173 (`ScandirIteratorType`), followed by errors at 16220 (`list`), 16224 (`trace`), and 16246; untouched.

Files changed this run: `PORT_STATUS.md` only. Existing compatibility-patch edits, frontier-test edits, and the extensive nested CPython changes were preserved.

Exact commands/results:

| Command | Exit/result |
|---|---|
| `git status --short --branch; git -C cpython status --short --branch; git -C cpython rev-parse HEAD; git -C cpython describe --tags --exact-match` | 0; pre-existing outer and nested changes preserved; baseline/tag unchanged (`v3.11.16`, `41388c9cb160d0886d5ca00d2e6c878260a8a4549`). |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; fresh forced probe compiled 39/40, zero cached; first errors are the five C2065 loader-search constants above; distinct C89 diagnostics follow. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; all applicable regression suites and shell syntax checks passed (`ALL TESTS PASSED`). |
| `git -C cpython diff --check; cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch; git diff --check -- . ":(exclude)compat/msvc600/cpython-3.11.16-vc6-headers.patch"` | 0; nested/outer whitespace checks passed; compatibility patch matches complete nested diff byte-for-byte. |

Compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution verified. Next frontier: establish authoritative intended Win9x behavior for the five exported loader-search constants, then add a focused failing test before any source edit. Keep later C89 blockers separate.

---

## Latest revision (scheduled forced fresh VC6 frontier recheck; loader-search constants remain first blocker)

Date: 2026-09-29 08:00 UTC

Read `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before probing. Preserved all existing outer and nested changes. No reset, clean, stash, discard, overwrite of unrelated work, commit, push, or publication. CPython remains detached at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. `_blake2/blake2s_impl.c` remains successful but is not the active frontier. Forced fresh probe reconfirmed the first blocker in `posixmodule.c`; the Win9x API contract for the five exported loader-search constants is unresolved, so this was diagnostic-only and no coding subagent or implementation change was appropriate.

The probe compiled 39/40 listed sources (`total=40 compiled=39 cached=0 skipped=0`), including `_blake2/blake2s_impl.c`. First stable diagnostics are C2065 at `posixmodule.c(15856)`–`(15860)` for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. Separate subsequent C89 diagnostics start at line 16173 (`ScandirIteratorType`), followed by errors at 16220 (`list`), 16224 (`trace`), and 16246; untouched.

Files changed this run: `PORT_STATUS.md` only. Existing compatibility patch changes, frontier test edits, and nested CPython changes were preserved.

Exact commands/results:

| Command | Exit/result |
|---|---|
| `git -C cpython rev-parse HEAD && git -C cpython describe --tags --exact-match && git -C cpython status --short --branch && date -u '+%Y-%m-%d %H:%M UTC'` | 0; baseline/tag unchanged; existing nested modifications preserved; `2026-09-29 08:00 UTC`. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; fresh forced probe compiled 39/40, zero cached; first diagnostics are the five C2065 loader-search constants above; separate C89 diagnostics follow. Full log: `/home/ubuntu/.hermes/profiles/maxwell/cache/scratch/python-win9x-frontier-20260929-0800.log`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; all applicable regression suites and syntax checks passed (`ALL TESTS PASSED`). |
| `git -C cpython diff --check && cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch && git diff --check -- . ':(exclude)compat/msvc600/cpython-3.11.16-vc6-headers.patch'` | 0; nested and outer diff checks passed; generated compatibility patch matches the complete nested diff byte-for-byte. |

Compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution verified. Next frontier: establish authoritative intended Win9x behavior for the five exported loader-search constants; then write a focused failing test before any source edit. Keep later C89 blockers separate.

---

## Latest revision (scheduled forced fresh VC6 frontier recheck; loader-search constants remain first blocker)

Date: 2026-09-29 05:56 UTC

Read `PORT_STATUS.md`, `README.md`, and the active-profile CPython/Win9x/MSVC6 reference before probing. Preserved all existing outer and nested changes; no reset, clean, stash, discard, commit, push, or publication. CPython remains detached at `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. The `_blake2/blake2s_impl.c` compile state remains true but is not the active frontier. Forced fresh probe reconfirmed `posixmodule.c` as first blocker; the Win9x API contract of the exported loader-search constants remains unresolved, so this run was diagnostic-only and no coding subagent was used.

The probe compiled 39/40 listed sources (`total=40 compiled=39 cached=0 skipped=0`), including `_blake2/blake2s_impl.c`. First stable errors: C2065 at `posixmodule.c(15856)`–`(15860)` for all five `LOAD_LIBRARY_SEARCH_*` constants (DEFAULT_DIRS, APPLICATION_DIR, SYSTEM32, USER_DIRS, DLL_LOAD_DIR). Distinct subsequent C89 diagnostics start at line 16173 (`ScandirIteratorType`), followed by errors at 16220, 16224, and 16246; not addressed.

Files changed this run: `PORT_STATUS.md` only. Existing compatibility patch, regression script edits, and nested CPython changes were preserved.

Exact commands/results:

|| Command | Exit/result |
||---|---|
|| `git status --short --branch && git -C cpython status --short --branch && git -C cpython rev-parse HEAD && git -C cpython describe --tags --exact-match && date -u '+%Y-%m-%d %H:%M UTC'` | 0; pre-existing changes preserved; baseline/tag unchanged; 2026-09-29 05:56 UTC. |
|| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; forced fresh probe compiled 39/40, zero cached; first errors are five C2065 loader-search constants; later distinct C89 errors remain. |
|| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; all applicable regression suites passed (`ALL TESTS PASSED`). |
|| `git -C cpython diff --check && cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch; git diff --check -- . ':(exclude)compat/msvc600/cpython-3.11.16-vc6-headers.patch'` | 0; nested/outer diff checks passed and generated compatibility patch byte-matches complete nested diff. |

Compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution verified. Next frontier: establish authoritative intended Win9x behavior of the five exported loader-search constants; then write a focused failing test before any source edit. Keep later C89 blockers separate.

---

## Latest revision (scheduled forced fresh VC6 frontier recheck; loader-search constants remain first blocker)

Date: 2026-09-29 03:52 UTC

Read `PORT_STATUS.md`, `README.md`, and the active-profile legacy-toolchain reference before probing. Preserved all existing outer and nested changes; no reset, clean, stash, discard, commit, push, or publication. CPython remains detached at `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. The recorded `_blake2/blake2s_impl.c` state remains true, but is not the current frontier. Fresh forced probe reconfirmed `posixmodule.c` as first blocker; no implementation change was safe because exported loader-search constants' Win9x API contract remains unresolved. Diagnostic-only; no coding subagent used.

Probe compiled 39/40 listed sources (`total=40 compiled=39 cached=0 skipped=0`), including `_blake2/blake2s_impl.c`. First stable errors are C2065 at `posixmodule.c(15856)`–`(15860)` for all five `LOAD_LIBRARY_SEARCH_*` constants. Distinct later C89 errors start at line 16173 (`ScandirIteratorType`), followed by errors at 16220, 16224, and 16246. No source/test changes were made.

Files changed this run: `PORT_STATUS.md` only. Existing compatibility patch, regression script, and nested CPython edits preserved.

Exact commands/results:

| Command | Exit/result |
|---|---|
| `git -C cpython rev-parse HEAD && git -C cpython describe --tags --exact-match && git -C cpython status --short --branch && date -u '+%Y-%m-%d %H:%M UTC'` | 0; baseline/tag unchanged; existing nested changes preserved; 2026-09-29 03:52 UTC. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; 39/40 compiled, zero cached; first errors are five C2065 constants above. Full log: `/home/ubuntu/.hermes/profiles/maxwell/cache/scratch/python-win9x-frontier-current.log`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; all applicable suites passed (`ALL TESTS PASSED`). |

Compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine execution, or Windows 98 SE execution verified. Next frontier: establish intended Win9x behavior of the five exported loader-search constants using authoritative API evidence; then write a focused failing test before any source edit. Keep later C89 blockers separate.

---

## Latest revision (scheduled forced VC6 frontier recheck; posixmodule remains first blocker)

Date: 2026-09-29 01:51 UTC

Read `PORT_STATUS.md`, `README.md`, and the active-profile CPython/Win9x/MSVC6 reference before probing. Preserved all pre-existing outer and nested edits; no reset, clean, stash, discard, commit, push, or publication. CPython remains detached at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. The recorded `_blake2/blake2s_impl.c` state is still true, but it is not the active frontier. A forced fresh probe reconfirmed the first blocker in `posixmodule.c`; the intended Win9x-visible contract for its five exported loader-search constants remains unresolved, so this run was diagnostic-only. No coding subagent was used because implementation was not appropriate.

The fresh probe compiled 39/40 listed sources (`total=40 compiled=39 cached=0 skipped=0`), including `_blake2/blake2s_impl.c`. First stable diagnostics are C2065 at `posixmodule.c(15856)`–`(15859)` for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, and `LOAD_LIBRARY_SEARCH_USER_DIRS`. The recorded fifth constant (`LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`) did not appear in this probe output. Separate later C89 diagnostics begin at `posixmodule.c(16173)` (`ScandirIteratorType`), then at 16220 (`list`) and 16224 (`trace`), with cascading diagnostics; untouched. No source or test files were changed.

Files changed this run: `PORT_STATUS.md` only. Existing compatibility patch, regression-test edits, and nested CPython changes were preserved.

Exact commands/results:

| Command | Exit/result |
|---|---|
| `git status --short --branch; git -C cpython status --short --branch; git -C cpython rev-parse HEAD; git -C cpython describe --tags --exact-match` | 0; existing modifications preserved; CPython baseline remains `v3.11.16` / `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; forced fresh probe; 39/40 compiled, zero cached; `_blake2/blake2s_impl.c` compiled. First reported errors are four C2065 loader-search constants at `posixmodule.c(15856)`–`(15859)`; distinct C89 errors follow. Full log: `/home/ubuntu/.hermes/profiles/maxwell/cache/scratch/python-win9x-frontier.1E0y6P.log`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; shell syntax and all applicable regression suites passed (`ALL TESTS PASSED`). |
| `git -C cpython diff --check; cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch; git diff --check -- . ':(exclude)compat/msvc600/cpython-3.11.16-vc6-headers.patch'` | 0; nested/outer whitespace checks passed; generated patch byte-matches the complete nested diff. |

Compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next frontier: investigate why `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR` was not reported and establish authoritative intended Win9x behavior for all five exported constants; then write a focused failing test before any source edit. Keep later C89 diagnostics separate.

---

## Latest revision (scheduled fresh forced VC6 frontier confirmation; loader-search constants remain blocker)

Date: 2026-09-28 23:47 UTC

Read `PORT_STATUS.md`, `README.md`, and the active-profile CPython/Win9x/MSVC6 reference before probing. Preserved all pre-existing outer and nested changes; no reset, clean, stash, discard, overwrite, commit, push, or publication. CPython remains tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. The `_blake2/blake2s_impl.c` sequence remains compiling, but is not the active frontier. A forced fresh probe reconfirmed the first blocker in `posixmodule.c`; no implementation slice was safe because the Win9x-visible contract for its five exported loader-search constants remains unresolved. Diagnostic-only; no coding subagent was used.

The forced probe compiled 39/40 listed sources (`total=40 compiled=39 cached=0 skipped=0`), including `_blake2/blake2s_impl.c`. First stable diagnostics are C2065 at `posixmodule.c(15856)`–`(15860)` for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. Separate later C89 diagnostics begin at line 16173 (`PyObject ScandirIteratorType`), followed by `list` at 16220 and `trace` at 16224, with cascading errors; untouched.

Files changed this run: `PORT_STATUS.md` only. Existing outer modifications and nested CPython edits were preserved.

Exact commands/results:

| Command | Exit/result |
|---|---|
| `git status --short --branch && git -C cpython status --short --branch && git -C cpython rev-parse HEAD && git -C cpython describe --tags --exact-match` | 0; pre-existing modifications preserved; baseline `v3.11.16` / `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; forced fresh probe compiled 39/40, zero cached; first stable diagnostics are the five C2065 constants above; separate C89 diagnostics follow. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; all applicable regression suites and shell syntax checks passed (`ALL TESTS PASSED`). |
| `git -C cpython diff --check && cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch && git diff --check -- . ':(exclude)compat/msvc600/cpython-3.11.16-vc6-headers.patch'` | 0; nested and outer diff checks passed; generated compatibility patch matched the complete nested diff byte-for-byte. |

Compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next frontier: establish authoritative intended Win9x behavior for the five exported loader-search constants; then write a focused failing test before any source change. Keep later C89 diagnostics distinct.

---

## Previous revision (scheduled fresh forced VC6 frontier confirmation; loader-search constants remain blocker)

Date: 2026-09-28 21:43 UTC

Read `PORT_STATUS.md`, `README.md`, and the active-profile CPython/Win9x/MSVC6 reference before probing. Preserved all pre-existing outer and nested changes; no reset, clean, stash, discard, overwrite, commit, push, or publication. CPython remains tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. The `_blake2/blake2s_impl.c` sequence remains compiling but is not the active frontier. A forced fresh probe reconfirmed the first blocker in `posixmodule.c`; no safe implementation slice was established because the intended Win9x-visible contract for its five exported loader-search constants remains unresolved. This was diagnostic-only; no coding subagent was used because implementation was not appropriate.

The fresh probe compiled 39/40 listed sources (`total=40 compiled=39 cached=0 skipped=0`), including `_blake2/blake2s_impl.c`. First stable diagnostics: C2065 at `posixmodule.c(15856)`–`(15860)` for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. Separate later C89 diagnostics begin at line 16173 (`PyObject ScandirIteratorType`), then line 16220 (`list`) and line 16224 (`trace`), followed by cascading diagnostics; left untouched.

Files changed this run: `PORT_STATUS.md` only. Existing outer modifications and nested CPython edits were preserved.

Exact commands/results:

| Command | Exit/result |
|---|---|
| `git status --short --branch && git rev-parse HEAD && git -C cpython status --short --branch && git -C cpython rev-parse HEAD && git -C cpython describe --tags --exact-match` | 0; preserved existing modifications; CPython baseline `v3.11.16` / `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; forced fresh probe compiled 39/40, zero cached; first stable errors are the five C2065 constants above; distinct later C89 errors remain. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; all applicable regression suites and syntax checks passed (`ALL TESTS PASSED`). |
| `git -C cpython diff --check && cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch && git diff --check -- . ':(exclude)compat/msvc600/cpython-3.11.16-vc6-headers.patch'` | 0; nested and outer diff checks passed; generated compatibility patch matched the complete nested diff byte-for-byte. |

Compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next frontier: establish authoritative intended Win9x behavior for the five exported loader-search constants; then write a focused failing test before any source change. Keep later C89 diagnostics distinct.

---

## Previous revision (fresh forced VC6 frontier confirmation; loader-search constants remain blocker)

Date: 2026-09-28 17:32 UTC

Read `PORT_STATUS.md`, `README.md`, and the active-profile CPython/Win9x/MSVC6 reference before probing. Preserved all pre-existing outer and nested changes; no reset, clean, stash, discard, overwrite of unrelated work, commit, push, or publication. CPython remains tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. The `_blake2/blake2s_impl.c` sequence remains compiling but is not the active frontier. The forced fresh probe reconfirmed the recorded first blocker in `posixmodule.c`; no safe implementation slice was established because the intended Win9x-visible contract for its five exported loader-search constants remains unresolved. No coding subagent was used because implementation was not appropriate for this diagnostic-only run.

The fresh probe compiled 39/40 listed sources (`total=40 compiled=39 cached=0 skipped=0`), including `_blake2/blake2s_impl.c`. First stable diagnostics: C2065 at `posixmodule.c(15856)`–`(15860)` for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. Subsequent separate C89 diagnostics begin at line 16173 (`PyObject ScandirIteratorType`), then line 16220 (`list`) and 16224 (`trace`), followed by related cascading diagnostics; untouched.

Files changed this run: `PORT_STATUS.md` only. All pre-existing outer changes and nested CPython edits were preserved.

Exact commands/results:

| Command | Exit/result |
|---|---|
| `git status --short --branch && git -C cpython status --short --branch && git -C cpython rev-parse HEAD && git -C cpython describe --tags --exact-match && date -u '+%Y-%m-%d %H:%M UTC'` | 0; baseline `v3.11.16` / `41388c9cb160d0886d5ca00d2e6c878260a8a4549`; existing nested modifications preserved; timestamp `2026-09-28 17:32 UTC`. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; forced fresh probe compiled 39/40, zero cached; first stable errors are the five C2065 constants above; later distinct C89 errors remain. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; syntax checks and all applicable regression suites passed (`ALL TESTS PASSED`). |
| `git -C cpython diff --check && cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch && git diff --check -- . ':(exclude)compat/msvc600/cpython-3.11.16-vc6-headers.patch'` | 0; nested and outer whitespace checks passed; generated compatibility patch matched the complete nested diff byte-for-byte. |

Compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next frontier: establish authoritative intended Win9x behavior for the five exported loader-search constants; then add a focused failing test before any source change. Keep later C89 diagnostics separate.

---

## Latest revision (fresh forced VC6 frontier confirmation; loader-search constants remain blocker)

Date: 2026-09-28 15:30 UTC

Read `PORT_STATUS.md`, `README.md`, and the active-profile CPython/Win9x/MSVC6 reference before probing. Preserved all pre-existing outer and nested modifications; no reset, clean, stash, discard, overwrite of unrelated work, commit, push, or publication. CPython baseline remains tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. The `_blake2/blake2s_impl.c` sequence is still compiling and is not the active frontier. A forced fresh probe reconfirmed the recorded first blocker in `posixmodule.c`; no safe implementation slice was established because the intended Win9x-visible contract for its five exported loader-search constants remains unresolved. No coding subagent was used because implementation was not appropriate for this diagnostic-only run.

The fresh probe compiled 39/40 listed sources (`total=40 compiled=39 cached=0 skipped=0`), including `_blake2/blake2s_impl.c`. First stable diagnostics are C2065 at `posixmodule.c(15856)`–`(15860)` for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. Separate subsequent C89 diagnostics begin at line 16173 (`PyObject ScandirIteratorType`), then line 16220 (`list`) and 16224 (`trace`); untouched.

Files changed this run: `PORT_STATUS.md` only. All pre-existing outer changes and nested CPython edits were preserved.

Exact commands/results:

| Command | Exit/result |
|---|---|
| `git -C cpython rev-parse HEAD && git -C cpython describe --tags --exact-match && git -C cpython status --short --branch && date -u '+%Y-%m-%d %H:%M UTC'` | 0; baseline `v3.11.16` / `41388c9cb160d0886d5ca00d2e6c878260a8a4549`; existing nested changes preserved; timestamp `2026-09-28 15:28 UTC`. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; forced fresh probe compiled 39/40, zero cached; first stable errors are the five C2065 constants above; later distinct C89 errors remain. Full log: `/home/ubuntu/.hermes/profiles/maxwell/cache/scratch/python-win9x-frontier.log`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; syntax checks and all applicable regression suites passed (`ALL TESTS PASSED`). |
| `git diff --check -- . ':(exclude)compat/msvc600/cpython-3.11.16-vc6-headers.patch' && git -C cpython diff --check && cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | 0 before the status update; outer diff clean, nested diff clean, generated compatibility patch matched the complete nested diff byte-for-byte. |

Compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next frontier: establish authoritative intended Win9x behavior for the five exported loader-search constants; then add a focused failing test before any source change. Keep later C89 diagnostics separate.

---

## Previous revision (fresh forced VC6 frontier confirmation; loader-search constants remain blocker)

Date: 2026-09-28 13:27 UTC

Read `PORT_STATUS.md`, `README.md`, and the active-profile CPython/Win9x/MSVC6 reference before probing. Preserved all existing outer and nested modifications; no reset, clean, stash, discard, overwrite of unrelated work, commit, push, or publication. CPython baseline remains tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. The requested `_blake2/blake2s_impl.c` sequence remains compilable and is not the active frontier. The forced fresh source-list probe reconfirmed the active blocker in `posixmodule.c`; because the intended Win9x-visible contract for its five exported loader-search constants remains unresolved, this was diagnostic-only. No source/test change or coding subagent was appropriate.

The probe compiled 39/40 listed sources (`total=40 compiled=39 cached=0 skipped=0`), including `_blake2/blake2s_impl.c`. First stable diagnostics are C2065 at `posixmodule.c(15856)`–`(15860)` for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. Distinct subsequent VC6/C89 diagnostics begin at line 16173 (`PyObject ScandirIteratorType`), then line 16220 (`list`) and 16224 (`trace`); not addressed.

Files changed this run: `PORT_STATUS.md` only. All pre-existing outer changes and nested CPython edits were preserved.

Exact commands/results:

| Command | Exit/result |
|---|---|
| `git -C cpython rev-parse HEAD && git -C cpython describe --tags --exact-match && git -C cpython status --short --branch && date -u '+%Y-%m-%d %H:%M UTC'` | 0; baseline `v3.11.16` / `41388c9cb160d0886d5ca00d2e6c878260a8a4549`; existing nested modifications preserved; timestamp `2026-09-28 13:27 UTC`. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; 39/40 compiled, zero cached; first stable diagnostics are the five C2065 constants above; later distinct C89 diagnostics remain. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; syntax checks and all applicable regression suites passed (`ALL TESTS PASSED`). |

Compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next frontier: establish authoritative intended Win9x behavior for the five exported loader-search constants, then write a focused failing test before source changes. Keep the later C89 diagnostics separate.

---

Date: 2026-09-28 11:23 UTC

Read `PORT_STATUS.md`, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before work. Preserved all pre-existing outer and nested changes; no reset, clean, stash, discard, overwrite of unrelated changes, commit, push, or publication. CPython baseline is tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. The requested `_blake2/blake2s_impl.c` sequence still compiles but is not the active frontier. The forced source-list probe confirms the first blocker remains in `posixmodule.c`; its exported loader-search constant contract is still unresolved, so this was a diagnostic-only run and no coding subagent or speculative source/test edit was appropriate.

The fresh forced probe compiled 39/40 listed sources (`total=40 compiled=39 cached=0 skipped=0`), including `_blake2/blake2s_impl.c`. First stable diagnostics are C2065 at `posixmodule.c(15856)`–`(15860)` for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. Separate subsequent C89 diagnostics begin at line 16173 (`PyObject ScandirIteratorType`), then at 16220 (`list`) and 16224 (`trace`); they remain distinct and untouched.

Files changed this run: `PORT_STATUS.md` only. Existing compatibility patch, regression-test edits, and nested CPython changes were preserved.

Exact commands/results:

| Command | Exit/result |
|---|---|
| `git status --short --branch && git -C cpython status --short --branch && git -C cpython rev-parse HEAD && git -C cpython describe --tags --exact-match` | 0; pre-existing modifications preserved; baseline `v3.11.16` / `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; 39/40 compiled, zero cached; first stable diagnostics are the five C2065 constants above; later C89 diagnostics remain distinct. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; syntax checks and all applicable regression suites passed (`ALL TESTS PASSED`). |
| `git -C cpython diff --check && cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | 0; nested diff clean; generated compatibility patch byte-matches complete nested diff. |
| `git diff --check -- . ':(exclude)compat/msvc600/cpython-3.11.16-vc6-headers.patch'` | 0; outer non-generated diff check passed. |

Compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next frontier: establish authoritative intended Win9x behavior for the five exported loader-search constants, then add a focused failing test before source changes. Keep the later C89 diagnostics separate.

---

## Latest revision (scheduled forced VC6 frontier confirmation; loader-search constants remain blocker)

Date: 2026-09-28 09:18 UTC

Read `PORT_STATUS.md`, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before work. Preserved all pre-existing outer and nested changes; no reset, clean, stash, discard, overwrite of unrelated changes, commit, push, or publication. CPython baseline remains tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. The `_blake2/blake2s_impl.c` state was force-checked and remains successful, but is not the active frontier. The first blocker is still the five loader-search identifiers in `posixmodule.c`; no implementation slice was safe because the Win9x-visible exported API contract remains unresolved.

Forced fresh source-list probe compiled 39/40 sources (`total=40 compiled=39 cached=0 skipped=0`), including `_blake2/blake2s_impl.c`. First stable diagnostics: C2065 at `posixmodule.c(15856)`–`(15860)` for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. Later distinct C89 diagnostics begin at line 16173 (`PyObject ScandirIteratorType`), with subsequent errors at 16220 (`list`) and 16224 (`trace`). No source/test changes or coding-agent delegation were appropriate for this diagnostic-only run.

Files changed this run: `PORT_STATUS.md` only. Existing compatibility patch, regression-test edits, and nested CPython changes were preserved.

Exact commands/results:

| Command | Exit/result |
|---|---|
| `git status --short --branch; git -C cpython rev-parse HEAD; git -C cpython describe --tags --exact-match` | 0; pre-existing modifications preserved; baseline `v3.11.16` / `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; 39/40 compiled, zero cached; first stable errors are the five C2065 constants above; distinct later C89 diagnostics remain. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; syntax checks and all applicable regression suites passed (`ALL TESTS PASSED`). |
| `git -C cpython diff --check && cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | 0; nested diff clean; generated compatibility patch byte-matches complete nested diff. |

Compiler-probe progress only. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next frontier: establish the intended Win9x-visible contract for the five exported loader-search constants from authoritative API evidence, then add a focused failing test before source changes; leave later C89 diagnostics distinct.

---

## Previous revision (scheduled forced VC6 frontier confirmation; loader-search constants remain blocker)

Date: 2026-09-28 05:09 UTC

Read `PORT_STATUS.md`, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved existing outer and nested changes; no reset, clean, stash, discard, overwrite of unrelated work, commit, push, or publication. CPython baseline remains tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. The recorded `_blake2/blake2s_impl.c` state was freshly confirmed but is not the active frontier. The active first blocker remains five missing loader-search constants in `posixmodule.c`; because these are exported `os` constants and the Win9x-visible contract remains unresolved, made no speculative source/test edits and did not delegate implementation.

Forced fresh VC6 source-list probe compiled 39/40 sources (`total=40 compiled=39 cached=0 skipped=0`), including `_blake2/blake2s_impl.c`. First stable diagnostics are C2065 at `posixmodule.c(15856)`–`(15860)` for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. Later distinct C89 diagnostics begin at line 16173 (`PyObject ScandirIteratorType`), followed by line 16220 (`list`) and 16224 (`trace`); not addressed.

Files changed this run: `PORT_STATUS.md` only. Existing compatibility patch, regression tests, and nested CPython edits remain preserved.

Exact commands/results:

| Command | Exit/result |
|---|---|
| `git status --short --branch && git -C cpython status --short --branch && git -C cpython rev-parse HEAD && git -C cpython describe --tags --exact-match` | 0; pre-existing modifications preserved; baseline `v3.11.16` / `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; 39/40 compiled; first stable diagnostics are the five C2065 errors listed above; subsequent C89 diagnostics remain distinct. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; syntax checks and all applicable regression suites passed (`ALL TESTS PASSED`). |
| `git -C cpython diff --check && cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch && git diff --check -- . ':(exclude)compat/msvc600/cpython-3.11.16-vc6-headers.patch'` | 0; nested diff clean; generated compatibility patch byte-matches the complete nested diff; outer non-generated diff clean. |

Compiler-probe progress only. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next frontier: establish the intended Win9x-visible contract for the five exported loader-search constants from authoritative API evidence, then add a focused failing test before source changes. Keep later C89 diagnostics separate.

---

## Previous revision (scheduled forced VC6 frontier confirmation; loader-search constants remain blocker)

Date: 2026-09-28 03:02 UTC

Read `PORT_STATUS.md`, `README.md`, and the active-profile legacy-toolchain reference before acting. Preserved all outer and nested changes; no reset, clean, stash, discard, commit, push, or publication. CPython remains tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. The recorded `_blake2/blake2s_impl.c` state remains true but is not the active frontier. A forced fresh probe confirms the first blocker remains five missing `LOAD_LIBRARY_SEARCH_*` identifiers in `posixmodule.c`; no API-contract decision or source/test edit was made, and no coding subagent was appropriate for diagnostic-only work.

Probe compiled 39/40 listed sources (`total=40 compiled=39 cached=0 skipped=0`), including `_blake2/blake2s_impl.c`. First stable diagnostics: C2065 at `posixmodule.c(15856)`–`(15860)` for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. Separate later C89 diagnostics begin at line 16173 (`PyObject ScandirIteratorType`), with subsequent errors at 16220 (`list`) and 16224 (`trace`).

Files changed this run: `PORT_STATUS.md` only. Existing generated compatibility patch, frontier regression test, and nested CPython edits were preserved.

Exact commands/results:

| Command | Exit/result |
|---|---|
| `git status --short --branch; git -C cpython status --short --branch; git -C cpython rev-parse HEAD; git -C cpython describe --tags --exact-match; date -u '+%Y-%m-%d %H:%M UTC'` | 0; pre-existing changes preserved; baseline `v3.11.16` / `41388c9cb160d0886d5ca00d2e6c878260a8a4549`; timestamp `2026-09-28 03:02 UTC`. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; 39/40 compiled, `_blake2/blake2s_impl.c` compiled; first stable diagnostics are the five C2065 errors listed above; distinct C89 errors follow. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; syntax and all applicable regression suites passed (`ALL TESTS PASSED`). |
| `git -C cpython diff --check; cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch; git diff --check -- . ':(exclude)compat/msvc600/cpython-3.11.16-vc6-headers.patch'` | Each returned 0; nested diff clean, generated compatibility patch matches complete nested diff byte-for-byte, outer non-generated diff clean. |

Compiler-probe progress only. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next frontier: establish the intended Win9x-visible contract for the five exported loader-search constants from authoritative API evidence, then add a focused failing test before source changes. Keep the later C89 diagnostics separate.

---

## Previous revision (scheduled forced VC6 frontier confirmation; loader-search constants remain blocker)

Date: 2026-09-28 00:00 UTC

Read `PORT_STATUS.md`, `README.md`, and the active-profile legacy-toolchain reference before acting. Preserved all pre-existing outer and nested modifications; no reset, clean, stash, discard, commit, push, or publication. CPython remains tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. The `_blake2/blake2s_impl.c` source still compiles and is not the active frontier. No implementation or coding subagent was appropriate because the current blocker requires resolving the Win9x-visible contract for five exported loader-search constants; no authoritative new evidence or safe defect-family slice was established.

Forced fresh VC6 probe again compiled 39/40 listed sources (`total=40 compiled=39 cached=0 skipped=0`), including `_blake2/blake2s_impl.c`. First stable diagnostics are C2065 at `posixmodule.c(15856)`–`(15860)` for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. Later, separate C89 diagnostics begin at line 16173 (`PyObject ScandirIteratorType`), followed by errors at 16220 (`list`) and 16224 (`trace`). No source or test changes were made.

Files changed by this run: `PORT_STATUS.md` only. Existing generated compatibility patch, regression script changes, and nested CPython edits were preserved.

Exact commands and results:

| Command | Exit/result |
|---|---|
| `git status --short --branch && git -C cpython status --short --branch && git -C cpython rev-parse HEAD && git -C cpython describe --tags --exact-match` | 0; prior local modifications preserved; baseline remains `v3.11.16` / `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; 39/40 compiled, `_blake2/blake2s_impl.c` compiled; first diagnostics are the five C2065 constants above; distinct C89 diagnostics follow. |

Compiler-probe progress only. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next frontier: establish the intended Win9x-visible contract for the five exported loader-search constants using authoritative API evidence, then add a focused failing test before source changes. Keep later C89 diagnostics separate.

---

## Previous revision (forced VC6 frontier confirmation; loader-search constants remain blocker)

Date: 2026-09-27 22:58 UTC

Read `PORT_STATUS.md`, `README.md`, and the active-profile CPython/Win9x/MSVC6 reference before probing. Preserved all pre-existing outer and nested modifications; no reset, clean, stash, discard, commit, push, or publication. CPython remains tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. The `_blake2/blake2s_impl.c` source is still successful and not the active frontier. No implementation slice was safe because the first blocker is still the unresolved Win9x-visible contract for five exported loader-search constants; no speculative source or test edits were made.

Forced fresh VC6 probe result: 39/40 sources compiled (`total=40 compiled=39 cached=0 skipped=0`), including `_blake2/blake2s_impl.c`. First stable diagnostics are C2065 at `posixmodule.c(15856)`–`(15860)` for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. Separate later C89 diagnostics begin at line 16173 (`PyObject ScandirIteratorType`), followed by 16220 (`list`) and 16224 (`trace`); left distinct and untouched.

Files changed by this run: `PORT_STATUS.md` only. Existing generated compatibility patch, regression script changes, and nested CPython edits were preserved.

Exact commands and results:

| Command | Exit/result |
|---|---|
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; 39/40 compiled, `_blake2/blake2s_impl.c` compiled; first errors are the five C2065 constants above; distinct C89 diagnostics follow. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; syntax and all applicable regression suites passed (`ALL TESTS PASSED`). |
| `git -C cpython rev-parse HEAD && git -C cpython describe --tags --exact-match` | 0; baseline unchanged: `v3.11.16`, `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. |
| `git -C cpython diff --check && cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | 0; nested diff clean and generated patch matches complete nested diff byte-for-byte. |
| `git diff --check -- . ':(exclude)compat/msvc600/cpython-3.11.16-vc6-headers.patch'` | 0; outer non-generated diff check passed. |

Compiler-probe progress only. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next frontier: establish the intended Win9x-visible contract for the five exported loader-search constants using authoritative API evidence, then add a focused failing test before changing source. Keep the later C89 diagnostics separate.

---

## Latest revision (scheduled forced VC6 frontier confirmation; loader-search constants remain blocker)

Date: 2026-09-27 20:54 UTC

Read `PORT_STATUS.md`, `README.md`, and the supplied legacy-toolchain instructions before probing. The active-profile reference file was absent from both expected skill paths; the complete porting instructions were provided in the task. Preserved all existing outer and nested work; no reset, clean, stash, discard, commit, push, or publication. CPython remains tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. `_blake2/blake2s_impl.c` remains compilable but is not the active frontier. No source/test edit or coding subagent was appropriate: first stable blocker remains the unresolved Win9x-visible API contract for five exported loader-search constants.

Forced fresh compiler probe: 39/40 listed sources compiled (`total=40 compiled=39 cached=0 skipped=0`), including `_blake2/blake2s_impl.c`. First stable diagnostics: C2065 at `posixmodule.c(15856)`–`(15860)` for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. Later, separate C89 diagnostics begin at line 16173 (`PyObject ScandirIteratorType`), with further errors at 16220 (`list`), 16224 (`trace`), and C2059 at 16246. The API-contract decision is still unsupported by evidence; no fallback values or export changes were guessed.

Files changed by this run: `PORT_STATUS.md` only. Existing generated compatibility patch, regression script, and nested CPython changes were preserved.

Exact commands and results:

| Command | Exit/result |
|---|---|
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; 39/40 compiled, including `_blake2/blake2s_impl.c`; first diagnostics are the five C2065 errors above; subsequent C89 errors remain distinct. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; all syntax checks and applicable regression suites passed (`ALL TESTS PASSED`). |
| `git -C cpython diff --check && cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch && git diff --check -- . ':(exclude)compat/msvc600/cpython-3.11.16-vc6-headers.patch'` | 0; nested and outer whitespace checks passed; generated compatibility patch matches the complete nested diff byte-for-byte. |
| `git -C cpython rev-parse HEAD && git -C cpython describe --tags --exact-match && git status --short --branch` | 0; baseline/tag unchanged and pre-existing modifications preserved. |

Compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next frontier: establish authoritative intended Win9x behavior for the five exported loader-search constants; then write a focused failing test before any source edit. Keep subsequent C89 diagnostics separate.

---

## Previous revision (scheduled forced VC6 frontier confirmation; loader-search constants remain blocker)

Date: 2026-09-27 18:50 UTC

Read `PORT_STATUS.md`, `README.md`, and the active-profile CPython/Win9x/MSVC6 reference before probing. Preserved all pre-existing outer and nested changes; no reset, clean, stash, discard, commit, push, or publication. CPython remains tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. The recorded `_blake2/blake2s_impl.c` state remains true but is not the active frontier. No implementation subagent or source edit was appropriate: the current first blocker remains a Win9x-visible API-contract decision for five exported loader-search constants, not a defect family with a safe implementation established by evidence.

Forced a fresh compiler probe: 39/40 listed sources compiled (`total=40 compiled=39 cached=0 skipped=0`), including `_blake2/blake2s_impl.c`. First stable diagnostics remain C2065 at `posixmodule.c(15856)`–`(15860)` for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. Distinct subsequent C89 errors begin at `posixmodule.c(16173)` (`PyObject ScandirIteratorType`), followed by line 16220 (`PyObject list`), line 16224 (`trace`), and C2059 at 16246. No source or test change was safe without deciding the exported API contract.

Files changed by this run: `PORT_STATUS.md` only. Existing generated compatibility patch, frontier regression script, and nested CPython changes were preserved.

Exact commands and results:

| Command | Exit/result |
|---|---|
| `git status --short --branch; git -C cpython status --short --branch; git -C cpython rev-parse HEAD; git -C cpython describe --tags --exact-match` | 0; pre-existing modifications preserved; baseline/tag unchanged. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; 39/40 compiled, including `_blake2/blake2s_impl.c`; first stable errors are the five C2065 loader-search constants above; later distinct C89 errors remain. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; syntax and all applicable regression suites passed (`ALL TESTS PASSED`). |
| `git -C cpython diff --check; cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch; git diff --check -- . ':(exclude)compat/msvc600/cpython-3.11.16-vc6-headers.patch'` | 0; nested and outer whitespace checks passed; compatibility patch byte-matches the complete nested diff. |

Compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next frontier: establish the intended Win9x-visible contract for the five exported loader-search constants from authoritative API evidence; then add a focused failing test before any source edit. Keep later C89 diagnostics separate.

---

## Previous revision (forced fresh VC6 frontier confirmation; loader-search constants remain blocker)

Date: 2026-09-27 16:46 UTC

Read `PORT_STATUS.md`, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before probing. Preserved all pre-existing outer and nested modifications; no reset, clean, stash, discard, commit, push, or publication. CPython remains tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. The recorded `_blake2/blake2s_impl.c` compile state remains true but is not the active frontier. No implementation subagent was appropriate because the active blocker remains an unresolved Win9x-visible API contract.

Forced a fresh compiler probe: 39/40 listed sources compiled (`total=40 compiled=39 cached=0 skipped=0`), including `_blake2/blake2s_impl.c`. The first stable diagnostics remain C2065 at `posixmodule.c(15856)`–`(15860)` for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. Subsequent separate C89 diagnostics begin at `posixmodule.c(16173)` (`PyObject ScandirIteratorType`), continue at 16220 (`PyObject list`) and 16224 (`trace`); the transcript also reports C2059 at 16246. No source or test change was safe without determining the intended Win9x-visible contract for the five exported constants.

Files changed by this run: `PORT_STATUS.md` only. Existing changes to the compatibility patch, frontier regression script, and nested CPython sources were preserved.

Exact commands and results:

| Command | Exit/result |
|---|---|
| `git -C cpython rev-parse HEAD && git -C cpython describe --tags --exact-match && git -C cpython status --short --branch && git status --short --branch` | 0; baseline/tag unchanged; all existing modifications preserved. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; 39/40 compiled, including `_blake2/blake2s_impl.c`; first stable errors are the five C2065 loader-search constants above, followed by separate C89 errors. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; all applicable suites passed (`ALL TESTS PASSED`). |
| `git -C cpython diff --check && cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch && git diff --check -- . ':(exclude)compat/msvc600/cpython-3.11.16-vc6-headers.patch'` | 0; nested diff clean, generated compatibility patch byte-for-byte matches complete nested diff, and outer non-generated diff check passed. |

Compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next frontier: establish authoritative behavior for these five exported loader-search constants on Win9x; then write a focused failing test before any source edit. Keep the separate C89 diagnostics distinct.

---

## Latest revision (scheduled forced VC6 frontier confirmation; loader-search constants remain blocker)

Date: 2026-09-27 10:34 UTC

Read `PORT_STATUS.md`, `README.md`, and the active-profile reference `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md`. Preserved all existing outer and nested work; no reset, clean, stash, discard, overwrite, commit, push, or publication. CPython baseline remains tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. The `_blake2/blake2s_impl.c` source remains passing but is not the active frontier. No implementation subagent was appropriate because the first blocker remains an unresolved Win9x-visible API contract for five exported loader-search constants.

Forced a fresh probe: 39/40 listed sources compiled (`total=40 compiled=39 cached=0 skipped=0`), including `_blake2/blake2s_impl.c`. First stable diagnostics remain C2065 at `posixmodule.c(15856)`–`(15860)` for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. Separate later C89 diagnostics begin at line 16173 (`PyObject ScandirIteratorType`), then 16220 (`PyObject list`) and 16224 (`trace`). No speculative source or test change was safe.

Files changed by this run: `PORT_STATUS.md` only. Existing modifications to the generated compatibility patch, frontier regression script, and nested CPython sources were preserved.

Exact commands and results:

| Command | Exit/result |
|---|---|
| `git status --short --branch; git -C cpython status --short --branch; git -C cpython rev-parse HEAD; git -C cpython describe --tags --exact-match` | 0; pre-existing changes preserved; baseline/tag unchanged. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; 39/40 compiled, `_blake2/blake2s_impl.c` compiled; first diagnostics are the five C2065 errors above; later C89 errors start at line 16173. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; all applicable regression suites passed (`ALL TESTS PASSED`). |
| `git -C cpython diff --check; cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch; git diff --check -- . ':(exclude)compat/msvc600/cpython-3.11.16-vc6-headers.patch'` | 0; nested whitespace check passed, generated compatibility patch matches complete nested diff byte-for-byte, and outer non-generated diff check passed. |

Compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next frontier: establish the intended Win9x-visible contract for the five exported loader-search constants from authoritative API evidence; then add a focused failing test before changing source. Keep subsequent C89 diagnostics separate.

---

## Previous revision (forced VC6 frontier confirmation; loader-search constants remain blocker)

Date: 2026-09-27 08:27 UTC

Read `PORT_STATUS.md`, `README.md`, and the active-profile CPython/Win9x/MSVC6 reference before acting. Preserved all existing outer and nested modifications; no reset, clean, stash, discard, commit, push, or publication. Baseline remains CPython tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. The recorded `_blake2/blake2s_impl.c` compile state remains true, but it is not the active frontier. No implementation subagent was appropriate: the current blocker is still the unresolved Win9x-visible contract for exported loader-search constants.

Forced fresh probe compiled 39/40 listed sources (`total=40 compiled=39 cached=0 skipped=0`), including `_blake2/blake2s_impl.c`. First stable diagnostics remain C2065 at `posixmodule.c(15856)`–`(15860)` for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. Later distinct C89 diagnostics begin at line 16173 (`PyObject ScandirIteratorType`), then 16220 (`PyObject list`) and 16224 (`trace`). No source/test implementation was safe; this run was diagnostic-only.

Files changed by this run: `PORT_STATUS.md` only. Existing changes to the generated compatibility patch, frontier regression script, and nested CPython checkout were preserved.

Exact commands/results:

| Command | Exit/result |
|---|---|
| `git status --short --branch; git -C cpython status --short --branch; git -C cpython rev-parse HEAD; git -C cpython describe --tags --exact-match; git -C cpython diff --check; cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | 0; existing modifications preserved, baseline/tag unchanged, nested diff clean and tracked patch matches complete nested diff byte-for-byte. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; 39/40 compiled, including `_blake2/blake2s_impl.c`; first diagnostics are the five C2065 constants above; later C89 errors start at `posixmodule.c(16173)`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; shell syntax and all applicable regression suites passed (`ALL TESTS PASSED`). |

Compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next frontier: establish the intended Win9x-visible contract for the five exported loader-search constants using authoritative API evidence; then add a focused failing test before any source change. Keep later C89 diagnostics separate.

---

## Latest revision (scheduled forced VC6 frontier confirmation; loader-search constants remain blocker)

Date: 2026-09-27 06:26 UTC

Read `PORT_STATUS.md`, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved all existing outer modifications and the nested CPython port diff; no reset, clean, stash, discard, overwrite, commit, push, or publication. Baseline remains CPython tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. The recorded `_blake2/blake2s_impl.c` compile state remains true, but it is not the active frontier. No implementation/coding subagent was appropriate: the first blocker remains a Win9x-visible API contract decision for exported constants, with no authoritative choice established.

Forced fresh probe compiled 39/40 listed sources (`total=40 compiled=39 cached=0 skipped=0`), including `_blake2/blake2s_impl.c`. First stable diagnostics remain C2065 at `posixmodule.c(15856)`–`(15860)` for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. Later distinct C89 diagnostics begin at line 16173 (`PyObject ScandirIteratorType`), then 16220 (`PyObject list`) and 16224 (`trace`). No source or test implementation was safe; this run was diagnostic-only.

Files changed by this run: `PORT_STATUS.md` only. Existing changes to the generated compatibility patch, frontier regression script, and nested CPython checkout were preserved.

Exact commands/results:

| Command | Exit/result |
|---|---|
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; 39/40 compiled; `_blake2/blake2s_impl.c` compiled; first diagnostics are the five C2065 constants above; later C89 diagnostics begin at `posixmodule.c(16173)`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; all applicable suites passed (`ALL TESTS PASSED`). |
| `git -C cpython diff --check && cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | 0; nested diff clean and generated patch matches the complete nested diff byte-for-byte. |
| `git diff --check -- . ':(exclude)compat/msvc600/cpython-3.11.16-vc6-headers.patch'` | 0; outer non-generated diff check passed. |

Compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next frontier: establish the intended Win9x-visible contract for the five exported loader-search constants using authoritative API evidence; then add a focused failing test before any source change. Keep later C89 diagnostics separate.

---

## Latest revision (forced VC6 frontier confirmation; loader-search constants remain blocker)

Date: 2026-09-27 04:22 UTC

Read `PORT_STATUS.md`, `README.md`, and the active-profile reference `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md`. Preserved all existing outer and nested modifications; no reset, clean, stash, discard, commit, push, or publication. Baseline remains CPython tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. `_blake2/blake2s_impl.c` remains compilable but is not the active frontier. A forced fresh probe reconfirmed the first stable blocker; no source/test implementation was safe. One coding subagent was requested per workflow but failed before launch because the delegation runtime requires the unavailable `anthropic` package. This was diagnostic-only.

The probe compiled 39/40 listed sources (`total=40 compiled=39 cached=0 skipped=0`), including `_blake2/blake2s_impl.c`. First stable diagnostics are C2065 at `posixmodule.c(15856)`–`(15860)` for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. Later distinct C89 diagnostics begin at line 16173 (`PyObject ScandirIteratorType`), then 16220 (`PyObject list`) and 16224 (`trace`). No unresolved Win9x-visible API contract was guessed.

Files changed by this run: `PORT_STATUS.md` only. Existing generated compatibility patch, frontier regression script, and nested CPython modifications were preserved.

Exact commands/results:

| Command | Exit/result |
|---|---|
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; 39/40 compiled, `_blake2/blake2s_impl.c` compiled; first diagnostics are the five C2065 constants above; later C89 diagnostics begin at `posixmodule.c(16173)`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; shell syntax and all applicable suites passed (`ALL TESTS PASSED`). |
| `git -C cpython rev-parse HEAD && git -C cpython describe --tags --exact-match && git -C cpython diff --check && cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | 0; baseline/tag unchanged; nested diff clean and generated patch matches it byte-for-byte. |
| Coding subagent delegation | Failed before launch: missing `anthropic` package; no child ran. |

Compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next frontier remains resolving the intended Win9x-visible contract for the five exported loader-search constants from authoritative API evidence. Keep later C89 diagnostics separate.

---

## Latest revision (forced VC6 frontier confirmation; Win32 loader-search constants remain blocker)

Date: 2026-09-27 02:15 UTC

Read `PORT_STATUS.md`, `README.md`, and the active-profile reference `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md`. Preserved all existing outer and nested changes. No reset, clean, stash, discard, commit, push, or publication. CPython remains tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. The recorded `_blake2/blake2s_impl.c` compile state remains true, but is not the active frontier. Fresh forced probe confirmed the recorded first blocker. No source/test edit or coding-agent delegation was appropriate: the five missing constants are exported by Windows `os`, and selecting fallback values or suppressing exports requires resolving the Win9x-visible API contract.

The probe compiled 39/40 listed sources (`total=40 compiled=39 cached=0 skipped=0`), including `_blake2/blake2s_impl.c`. First stable diagnostics: C2065 at `posixmodule.c(15856)`–`(15860)` for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. Later C89 diagnostics begin at line 16173 (`PyObject ScandirIteratorType`), followed by line 16220 (`PyObject list`) and line 16224 (`trace`); not addressed.

Files changed by this run: `PORT_STATUS.md` only. Existing generated compatibility patch, frontier regression tests, and nested CPython modifications were preserved. Compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified.

Exact commands/results:

| Command | Exit/result |
|---|---|
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; 39/40 compiled, `_blake2/blake2s_impl.c` compiled; first stable errors are the five C2065 constants above; subsequent C89 errors begin at `posixmodule.c(16173)`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; shell syntax checks and all applicable regression suites passed (`ALL TESTS PASSED`). |
| `git -C cpython rev-parse HEAD && git -C cpython describe --tags --exact-match && git -C cpython status --short --branch && git status --short --branch` | 0; baseline/tag unchanged; pre-existing outer and nested modifications preserved. |

Next frontier: resolve the intended Win9x-visible contract for the five exported loader-search constants from authoritative API evidence. If established, add a focused failing test before a narrow source change; keep the later C89 diagnostics separate.

---

## Latest revision (scheduled fresh VC6 frontier confirmation; loader-search constants remain blocker)

Date: 2026-09-26 22:07 UTC

Read this status, `README.md`, and the active-profile legacy-toolchain reference before work. Preserved all existing outer changes and nested CPython edits; no reset, clean, stash, discard, commit, push, or publication. The recorded `_blake2/blake2s_impl.c` state was rechecked via forced fresh probe and remains true; it compiles but is not the active frontier. No source implementation was appropriate because the first blocker remains the unresolved Win9x-visible contract for five exported Windows loader-search constants. No coding subagent was launched for this diagnostic-only run.

The forced probe compiled 39/40 sources (`total=40 compiled=39 cached=0 skipped=0`). First stable errors remain C2065 at `posixmodule.c(15856)`–`(15860)` for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. Later distinct C89 diagnostics begin at line 16173 (`PyObject ScandirIteratorType`), then line 16220 (`PyObject list`) and 16224 (`trace`). These remain outside this diagnostic slice.

Files changed by this run: `PORT_STATUS.md` only. Existing generated compatibility patch, frontier regression test, and nested CPython changes were preserved.

Exact commands/results:

| Command | Exit/result |
|---|---|
| `git status --short --branch; git -C cpython status --short --branch; git -C cpython rev-parse HEAD; git -C cpython describe --tags --exact-match; date -u '+%Y-%m-%d %H:%M UTC'` | 0; existing modifications preserved; CPython remains `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`; timestamp 2026-09-26 22:07 UTC. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; 39/40 compiled; `_blake2/blake2s_impl.c` compiled; first stable errors are the five C2065 constants above. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; syntax checks and all applicable regression suites passed (`ALL TESTS PASSED`). |

Compiler-probe progress only. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next frontier: establish the intended Win9x-visible contract for the five exported loader-search constants using authoritative API evidence; then add a focused failing test before any source edit. Keep later C89 diagnostics separate.

---

Date: 2026-09-26 20:06 UTC

Read `PORT_STATUS.md`, `README.md`, and the active-profile legacy-toolchain reference before work. Preserved all existing outer modifications and nested CPython port edits; no reset, clean, stash, discard, commit, push, or publication. The requested `_blake2/blake2s_impl.c` slice was not changed: a forced fresh probe confirmed it compiles, while the actual first blocker remains in `posixmodule.c`. Since the five loader-search constants are exported through the Windows `os` module and their Win9x-visible API contract remains unresolved, this run was diagnostic-only; no implementation subagent or source/test edit was appropriate.

Baseline remains CPython tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. The forced source-list probe compiled 39/40 sources (`total=40 compiled=39 cached=0 skipped=0`), including `_blake2/blake2s_impl.c`. First stable errors are C2065 at `posixmodule.c(15856)`–`(15860)` for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. Later distinct C89 diagnostics begin at line 16173 (`PyObject ScandirIteratorType`), then 16220 (`PyObject list`) and 16224 (`trace`); they remain outside this diagnostic slice.

Files changed by this run: `PORT_STATUS.md` only. Pre-existing modifications to the generated compatibility patch, frontier regression test, and nested CPython sources were preserved.

Exact commands/results:

| Command | Exit/result |
|---|---|
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; 39/40 compiled, `_blake2/blake2s_impl.c` compiled; first errors are the five C2065 loader-search constants above; subsequent distinct C89 diagnostics begin at `posixmodule.c(16173)`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; all applicable regression suites passed (`ALL TESTS PASSED`). |
| `git -C cpython rev-parse HEAD && git -C cpython describe --tags --exact-match` | 0; baseline remains `v3.11.16` / `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. |
| `git -C cpython diff --check && cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | 0; nested diff is clean and generated compatibility patch matches the complete nested diff byte-for-byte. |
| `git diff --check -- . ':(exclude)compat/msvc600/cpython-3.11.16-vc6-headers.patch'` | 0; non-generated outer diff check passed. |

Compiler-probe progress only. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next frontier: establish the intended Win9x-visible contract for the five exported loader-search constants using authoritative API evidence, then add a focused failing test before any source edit; keep later C89 diagnostics separate.

Read this status, `README.md`, and the active-profile CPython/Win9x/MSVC6 reference before work. Preserved the existing outer modifications to this status, the generated compatibility patch, and the frontier regression test, plus all nested CPython edits. No reset, clean, stash, discard, overwrite of unrelated work, commit, push, or publication. A forced fresh source-list probe confirmed the recorded `_blake2/blake2s_impl.c` compile state, but it is not the active frontier. No implementation subagent or source edit was appropriate: first blocker remains unresolved loader-search constants whose intended Win9x-visible API contract is not established.

The fresh probe compiled 39/40 sources. `_blake2/blake2s_impl.c` compiled. First stable errors remain C2065 at `posixmodule.c(15856)`–`(15860)` for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. Later distinct C89 diagnostics begin at line 16173 (`PyObject ScandirIteratorType`), then line 16220 (`PyObject list`) and 16224 (`trace`); these were not treated as the active blocker.

Files changed by this run: `PORT_STATUS.md` only. Existing changes to the compatibility patch, frontier test, and nested CPython checkout remain preserved.

Exact commands/results:

| Command | Exit/result |
|---|---|
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; `total=40 compiled=39 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First errors are the five C2065 loader-search constants above; later C89 diagnostics start at `posixmodule.c(16173)`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; all applicable regression checks passed (`ALL TESTS PASSED`). |
| `git -C cpython rev-parse HEAD && git -C cpython describe --tags --exact-match` | 0; baseline `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. |
| `git -C cpython diff --check && cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | 0; nested diff clean and compatibility patch matches the complete nested diff byte-for-byte. |
| `git diff --check -- . ':(exclude)compat/msvc600/cpython-3.11.16-vc6-headers.patch'` | 0; non-generated outer diff check passed. |

Compiler-probe progress only. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next frontier: resolve the intended Win9x-visible contract for the five exported loader-search constants using authoritative API evidence, then add a focused failing test before any source edit. Keep later C89 diagnostics separate.

---

Read this status, `README.md`, and the active-profile CPython/Win9x/MSVC6 reference before work. Preserved all existing outer and nested modifications; no reset, clean, stash, discard, overwrite of unrelated work, commit, push, or publication. A forced fresh source-list probe confirmed the recorded `_blake2/blake2s_impl.c` compile state but it is not the active frontier. No coding subagent or implementation was appropriate because the first blocker is unchanged and still requires a deliberate Win9x-visible API contract.

The probe compiled 39/40 listed sources. `_blake2/blake2s_impl.c` compiled. First stable errors remain C2065 at `posixmodule.c(15856)`–`(15860)` for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. Distinct later C89 diagnostics begin at line 16173. No fallback values or export changes were guessed.

Files changed by this run: `PORT_STATUS.md` only. Existing modifications to the compatibility patch, frontier test, and nested CPython checkout remain preserved.

Exact commands/results:

| Command | Exit/result |
|---|---|
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; `total=40 compiled=39 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First errors are the five C2065 loader-search constants above; later C89 diagnostics start at `posixmodule.c(16173)`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; all applicable regression checks passed (`ALL TESTS PASSED`). |
| `git -C cpython rev-parse HEAD && git -C cpython describe --tags --exact-match` | 0; baseline `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. |
| `git -C cpython diff --check && cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | 0; nested diff clean and compatibility patch matches the complete nested diff byte-for-byte. |
| `git diff --check -- . ':(exclude)compat/msvc600/cpython-3.11.16-vc6-headers.patch'` | 0; non-generated outer diff check passed. |

Compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next frontier: resolve the intended Win9x-visible contract for the five exported loader-search constants from authoritative API evidence, then add a focused failing test before any source edit. Keep the later C89 diagnostics separate.

---

## Latest revision (fresh VC6 frontier confirmation; loader-search constants remain blocker)

Date: 2026-09-26 11:51 UTC

Read `PORT_STATUS.md`, `README.md`, and the active-profile CPython/Win9x/MSVC6 reference before work. Preserved all existing top-level and nested modifications. No reset, clean, stash, discard, commit, push, or publication. The requested `_blake2/blake2s_impl.c` sequence was not attempted as an edit because the status-directed fresh probe confirms it already compiles; the active frontier remains `posixmodule.c`.

A forced fresh source-list probe compiled 39/40 sources. `_blake2/blake2s_impl.c` compiled. First stable errors remain five C2065 undeclared identifiers at `posixmodule.c(15856)`–`(15860)`: `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. Separate later C89 diagnostics begin at line 16173. These are exported `os` constants; choosing fallback values or suppressing exports would alter Win9x-visible API behavior. No authoritative contract was established in this run, so no production/test change was safe and no coding subagent was delegated. This run was diagnostic-only.

Files changed by this run: `PORT_STATUS.md` only; all pre-existing changes to this file, the compatibility patch, frontier test, and nested CPython checkout were preserved.

Exact commands and results:

| Command | Exit/result |
|---|---|
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; `total=40 compiled=39 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First errors are the five C2065 constants above; later C89 errors start at `posixmodule.c(16173)`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; shell syntax checks and all listed applicable regression suites passed (`ALL TESTS PASSED`). |
| `git -C cpython rev-parse HEAD && git -C cpython describe --tags --exact-match` | 0; baseline remains `41388c9cb160d0886d5ca00d2e6c878260a8a4549`, tag `v3.11.16`. |
| `git -C cpython diff --check && cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | 0; nested diff is clean and generated patch matches it byte-for-byte. |
| `git diff --check -- . ':!compat/msvc600/cpython-3.11.16-vc6-headers.patch'` | 0; outer non-generated diff check passed. |

Compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next step: establish the intended Win9x-visible contract for the five exported loader-search constants from authoritative API evidence; then add a focused failing test before any source edit. Keep the later C89 diagnostics separate.

---

## Latest revision (fresh frontier confirmation; loader-search constants remain blocker)

Date: 2026-09-26 09:47 UTC

Read `PORT_STATUS.md`, `README.md`, and the active-profile `legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before work. Preserved the existing outer modifications to this file, the generated compatibility patch, and the frontier regression test; preserved all nested CPython edits. No reset, clean, stash, discard, commit, push, or publication.

The status-directed `_blake2/blake2s_impl.c` sequence was checked by a forced fresh source-list probe. It still compiles, but is not the active frontier: 39/40 sources compile. The first stable blocker remains five C2065 diagnostics at `posixmodule.c(15856)`–`(15860)` for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. C89 errors start later at line 16173. Since the five names are exported `os` constants and no evidence resolves the intended Win9x-visible contract, no source/test implementation or coding-agent delegation was appropriate; this run was diagnostic-only.

Files changed by this run: `PORT_STATUS.md` only. Existing modifications were preserved.

Exact commands and results:

| Command | Exit/result |
|---|---|
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; total=40, compiled=39, cached=0, skipped=0; `_blake2/blake2s_impl.c` compiled. First diagnostics are the five C2065 loader-search constants above; subsequent C89 diagnostics begin at `posixmodule.c(16173)`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; all applicable checks and regression suites passed (`ALL TESTS PASSED`). |
| `git -C cpython rev-parse HEAD && git -C cpython describe --tags --exact-match` | `41388c9cb160d0886d5ca00d2e6c878260a8a4549`, tag `v3.11.16`; unchanged. |
| `git -C cpython diff --check && cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | 0; nested diff is clean and generated compatibility patch matches it byte-for-byte. |
| `git diff --check -- . ':!compat/msvc600/cpython-3.11.16-vc6-headers.patch'` | 0; outer non-generated diff check passed. |

Compiler-probe progress only. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next: establish the intended Win9x-visible contract for the five exported loader-search constants from authoritative API evidence, then add a focused failing test before any source edit. Keep later C89 diagnostics separate.

---

## Prior revision (fresh frontier confirmation; loader-search constants remain blocker)

Date: 2026-09-26 07:43 UTC

Read this status, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before work. The reference was found and read under the active profile at `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md`; it is absent at the default-profile path. Preserved the existing outer modifications to `PORT_STATUS.md`, `compat/msvc600/cpython-3.11.16-vc6-headers.patch`, and `scripts/vc6-probe-pythoncore-frontier.test.sh`, as well as all nested CPython work. No reset, clean, stash, discard, commit, push, or publication.

Forced a fresh source-list probe before considering implementation. `_blake2/blake2s_impl.c` compiles; 39/40 sources compile. The first stable blocker remains five C2065 diagnostics in `posixmodule.c(15856)`–`(15860)` for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. Distinct later C89 diagnostics begin at line 16173. This matches the recorded frontier. The five names are exposed as Windows `os` constants; choosing values or omitting exports would alter the Win9x-visible API contract, still unresolved by available evidence. No safe implementation slice or suitable failing test was identified, so this run was diagnostic-only and no coding subagent was delegated.

Exact commands/results:

| Command | Exit/result |
|---|---|
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; total=40, compiled=39, cached=0, skipped=0; `_blake2/blake2s_impl.c` compiled. First errors are the five C2065 constants above; later C89 errors begin at `posixmodule.c(16173)`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; all applicable suites and syntax checks passed (`ALL TESTS PASSED`). |
| `date -u '+%Y-%m-%d %H:%M UTC'; git status --short --branch; git -C cpython rev-parse HEAD; git -C cpython describe --tags --exact-match; git -C cpython diff --check; cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | 0; baseline remains `v3.11.16` / `41388c9cb160d0886d5ca00d2e6c878260a8a4549`; existing outer changes preserved; nested diff check and complete-patch byte comparison passed. |

Compiler-probe progress only. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next: resolve the intended Win9x-visible contract for the five exported loader-search constants using authoritative API evidence, then add a focused failing test before any source edit. Keep the later C89 diagnostics separate.

---

## Prior revision (forced frontier re-probe; Win32 loader-search constants remain first blocker)

Date: 2026-09-26 05:38 UTC

Before probing, read `PORT_STATUS.md` and `README.md`. The requested reference file `legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` is not installed in the active profile at the expected path; followed the complete legacy-toolchain instructions supplied for this run. Preserved pre-existing outer changes to `PORT_STATUS.md`, `compat/msvc600/cpython-3.11.16-vc6-headers.patch`, and `scripts/vc6-probe-pythoncore-frontier.test.sh`; nested CPython work was left intact. No reset, clean, stash, discard, commit, push, or publication.

Forced a fresh probe before choosing work. The `_blake2/blake2s_impl.c` sequence is not the active frontier: it compiles. Result remains 39/40 sources; the first stable blocker is five C2065 errors in `posixmodule.c(15856)`–`(15860)` for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. Later C89 diagnostics start at line 16173. The five values are Win32 loader-search constants exported by the `os` module; defining values or dropping those exports would alter Win9x-visible API behavior, and the available evidence does not establish which behavior is intended. No safe TDD implementation slice was identified, so this run was diagnostic-only and no coding agent was delegated.

Exact commands and results:

| Command | Exit/result |
|---|---|
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; total=40, compiled=39, cached=0, skipped=0. `_blake2/blake2s_impl.c` compiled. First errors are the five C2065 loader-search constants above; later C89 errors begin at `posixmodule.c(16173)`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; syntax validation and every listed applicable regression suite passed (`ALL TESTS PASSED`). |
| `git status --short --branch && git -C cpython rev-parse HEAD && git -C cpython describe --tags --exact-match && git -C cpython diff --check && cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | 0; outer local modifications preserved; nested baseline remains `v3.11.16` / `41388c9cb160d0886d5ca00d2e6c878260a8a4549`; nested whitespace check and byte-for-byte patch reproducibility check passed. |

Compiler-probe progress only. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next: establish the intended Win9x-visible API contract for the five loader-search constants, then add a focused failing test before any source change. Keep later C89 diagnostics separate.

---

## Prior revision (forced frontier re-probe; Win32 loader-search constants remain first blocker)

Read `PORT_STATUS.md`, `README.md`, and the active-profile CPython/Win9x/MSVC6 reference before probing. The attempted coding-agent delegation failed before launch because the runtime lacks the required `anthropic` package; no child ran. Preserved all pre-existing work: outer modifications to `PORT_STATUS.md`, the generated compatibility patch, and the frontier regression script; detached `cpython/` checkout remains extensively modified at baseline tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. No reset, clean, stash, discard, commit, push, or publication occurred.

The recorded `_blake2/blake2s_impl.c` state remains true but is not the active frontier. A forced fresh source-list probe compiled 39/40 listed sources, including `_blake2/blake2s_impl.c`. First stable blocker remains five C2065 errors in `posixmodule.c(15856)`–`(15860)` for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. Later distinct C89 errors begin at line 16173. These five names are Win32 loader-search constants exported into `os`; assigning fallback values or dropping exports would decide Win9x-visible API behavior, unsupported by current evidence. No source/test edit was safe; this run was diagnostic-only. The agent delegation prerequisite failed as noted above.

Exact commands and results:

| Command | Exit/result |
|---|---|
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; total=40, compiled=39, cached=0, skipped=0. `_blake2/blake2s_impl.c` compiled. First five errors are C2065 for the constants above; later C89 errors at `posixmodule.c(16173)` and onward. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; all applicable regression suites passed (`ALL TESTS PASSED`). |
| `git status --short --branch && git -C cpython rev-parse HEAD && git -C cpython describe --tags --exact-match` | 0; existing three outer modifications preserved; baseline is `v3.11.16` / `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. |
| `git -C cpython diff --check && cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch; git diff --check -- . ':!compat/msvc600/cpython-3.11.16-vc6-headers.patch` | 0; nested whitespace check, patch reproducibility comparison, and outer whitespace check passed. |
| Coding-agent delegation via `delegate_task` | Failed before launch: runtime error, missing `anthropic` package. No independent review or child implementation. |

This remains compiler-probe progress only. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next: establish the intended Win9x-visible contract for the five loader-search constants with authoritative API evidence; then write a focused failing test before any source change. Keep the later C89 blocker separate.

---

## Prior revision (forced frontier re-probe; Win32 loader-search constants remain first blocker)

Date: 2026-09-25 21:26 UTC

Before probing, read this status, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md`. Preserved all pre-existing work: outer modifications to `PORT_STATUS.md`, the generated compatibility patch, and the frontier regression script; detached `cpython/` checkout remains extensively modified at baseline tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. No reset, clean, stash, discard, commit, push, or publication occurred.

Forced a fresh source-list probe before deciding whether the recorded `_blake2/blake2s_impl.c` slice was still current. It compiles; 39 of 40 listed sources compile. The first stable blocker remains five C2065 errors in `posixmodule.c(15856)`–`(15860)` for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. Separate C89 diagnostics begin at line 16173. No implementation slice is safe without deciding the Win9x-visible behavior of the five exported `os` constants; no speculative edit or coding-agent delegation was appropriate. This run changed only this status entry.

Exact commands and results:

| Command | Exit/result |
|---|---|

---
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; 39/40 sources compiled, including `_blake2/blake2s_impl.c`; first five C2065 diagnostics are the constants listed above; later C89 family begins at `posixmodule.c(16173)`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; shell syntax and all applicable regression suites passed (`ALL TESTS PASSED` for each). |
| `git -C cpython rev-parse HEAD; git -C cpython describe --tags --exact-match; git -C cpython diff --check; cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch; git diff --check -- . ':!compat/msvc600/cpython-3.11.16-vc6-headers.patch'` | 0; baseline commit/tag unchanged, nested diff clean, generated patch matches the full nested diff byte-for-byte, outer non-generated diff clean. |

Compiler-probe progress only. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next: establish the intended Win9x behavior/API contract for the five exported loader-search constants, then add a focused failing regression before any source change. Keep later C89 diagnostics separate.

---

## Latest revision (forced frontier re-probe; Win32 loader-search constants remain first blocker)

Date: 2026-09-25 19:22 UTC

Read this status, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before probing. Preserved all pre-existing changes: outer modifications to this status, the generated compatibility patch, and the frontier regression script; detached `cpython/` checkout remains extensively modified at baseline tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. No reset, clean, stash, discard, commit, push, or publication occurred.

Forced a fresh source-list probe. `_blake2/blake2s_impl.c` still compiles, as do 39 of 40 listed sources. The first stable blocker remains five C2065 errors in `posixmodule.c(15856)`–`(15860)` for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. Later C89 diagnostics begin at line 16173 and remain a separate family. No source change was safe: these values are exposed as Windows `os` module constants, and choosing numeric fallbacks or dropping the exports changes Win9x-visible API behavior not established by available evidence. This run was diagnostic-only; no coding agent was delegated because implementation was not appropriate.

Files changed in this run: `PORT_STATUS.md` only. All existing nested CPython edits and generated patch were preserved.

Exact commands and results:

| Command | Exit/result |
|---|---|
| `git status --short --branch && git rev-parse HEAD && git -C cpython status --short --branch && git -C cpython rev-parse HEAD && git -C cpython describe --tags --exact-match` | 0; outer modifications preserved; nested checkout detached at `v3.11.16` / `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; 39/40 sources compiled, including `_blake2/blake2s_impl.c`. First five C2065 diagnostics are the loader-search constants above; later distinct C89 diagnostics begin at `posixmodule.c(16173)`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; shell syntax checks and all applicable regression suites passed. |
| `git -C cpython diff --check && cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch && git diff --check -- . ':!compat/msvc600/cpython-3.11.16-vc6-headers.patch'` | 0; nested diff check passed, compatibility patch matches the complete nested diff byte-for-byte, and non-generated outer diff check passed. |

Compiler-probe progress only. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next: establish the intended Win9x behavior/API contract for the five exported loader-search constants; only then add a focused failing test before any source change. Keep the later C89 diagnostics separate.

---

## Latest revision (diagnostic-only fresh frontier confirmation)

Date: 2026-09-25 UTC

Read this status, `README.md`, and the CPython/Win9x/MSVC6 reference before work. Preserved all pre-existing modifications: outer checkout edits to this file, the generated compatibility patch, and the frontier regression script; the detached `cpython/` checkout remains extensively modified. Baseline remains CPython tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. No reset, clean, stash, discard, commit, push, or publication occurred.

Re-forced the source-list probe before choosing implementation. `_blake2/blake2s_impl.c` still compiles, as do 39 of 40 listed sources. The first stable blocker remains five C2065 undeclared-identifier errors in `posixmodule.c(15856)`–`(15860)` for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. The module code exports these as `_LOAD_LIBRARY_SEARCH_*` integer constants. No authoritative local SDK definition or additional evidence resolving whether/how these constants should be exposed was found; assigning fallback values or removing exports remains an API-contract decision, so no speculative source edit was made. Later C89 diagnostics beginning at line 16173 remain a separate blocker. This run was diagnostic-only; no coding subagent was delegated.

Files changed in this run: `PORT_STATUS.md` only. Existing CPython edits, regression script, and generated compatibility patch were preserved.

Exact commands and results:

| Command | Exit/result |
|---|---|
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; `_blake2/blake2s_impl.c` compiles; total=40, compiled=39, cached=0, skipped=0. First stable diagnostics are the five C2065 errors listed above. Additional C89 diagnostics begin at `posixmodule.c(16173)`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; shell syntax and all applicable regression suites passed. |
| `git -C cpython diff --check && cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch && git diff --check -- . ':!compat/msvc600/cpython-3.11.16-vc6-headers.patch'` | 0; nested diff whitespace check passed, compatibility patch matches the complete nested diff byte-for-byte, and non-generated outer diff check passed. |

Compiler-probe progress only. No `pythoncore.dll`/`python.exe` link, Wine interpreter execution, or real Windows 98 SE execution is verified. Next frontier: resolve the intended Win9x `os` API contract for these five exported loader-search constants using authoritative Windows SDK/API evidence; then write a focused failing test before any source change. Keep the later C89 diagnostics separate.

---

## Latest revision (diagnostic-only forced frontier re-probe; loader-search constants remain first blocker)

Date: 2026-09-25 09:03 UTC

---

## Latest revision (forced frontier re-probe; Win32 loader-search constants remain first blocker)

Date: 2026-09-25 UTC

Read this status, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before work. Preserved all existing changes: the outer checkout already had modifications to `PORT_STATUS.md`, the generated CPython compatibility patch, and the frontier regression script; the detached `cpython/` checkout contains extensive local edits. CPython remains baseline tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. No reset, clean, stash, discard, commit, push, or publication occurred.

The status-directed `_blake2/blake2s_impl.c` sequence was re-evaluated with a forced fresh source-list probe before implementation. The recorded compile state remains true, but it is not the active frontier: 39/40 sources compile, and the first stable blocker remains five C2065 undeclared-identifier errors in `posixmodule.c(15856)`–`(15860)` for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. Source inspection confirms these values are exported as `_LOAD_LIBRARY_SEARCH_*` from the Windows `os` module initialization block. Assigning fallback values or omitting exports would decide Win9x-visible API behavior; available evidence does not establish that contract, so no speculative compatibility edit was made. Later C89 diagnostics beginning at line 16173 remain a distinct subsequent blocker. No coding agent was delegated because this run was diagnostic-only.

Files changed in this run: `PORT_STATUS.md` only. Existing nested CPython edits, the generated compatibility patch, and regression script were preserved.

Exact commands and results:

| Command | Exit/result |
|---|---|
| `git status --short --branch; git -C cpython status --short --branch; git -C cpython rev-parse HEAD; git -C cpython describe --tags --exact-match` | 0; outer pre-existing changes preserved; nested checkout detached at `v3.11.16` / `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; `_blake2/blake2s_impl.c` compiles; 39/40 sources compiled. First diagnostics are the five C2065 errors at `posixmodule.c(15856)`–`(15860)` listed above. Distinct later C89 diagnostics begin at line 16173. |
| `rg -n -C 4 'LOAD_LIBRARY_SEARCH_(DEFAULT_DIRS|APPLICATION_DIR|SYSTEM32|USER_DIRS|DLL_LOAD_DIR)|_LOAD_LIBRARY_SEARCH_' cpython/Modules/posixmodule.c` | 0; confirms all five are added as `os` module integer constants in the `MS_WINDOWS` block. |

Compiler-probe progress only. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next frontier: establish the intended Win9x behavior of the five exported loader-search constants before adding a focused failing test and changing source; then address later C89 diagnostics separately.


Read `PORT_STATUS.md`, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved the existing outer modifications to `PORT_STATUS.md`, the generated compatibility patch, and frontier test; the detached `cpython/` checkout also contains extensive local port edits. No reset, clean, stash, discard, commit, push, or publication occurred. CPython remains tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`.

Forced a fresh source-list compiler probe. The recorded `_blake2/blake2s_impl.c` state remains true, but it is not the active blocker: 39/40 listed sources compile. The first stable diagnostics remain five C2065 undeclared-identifier errors in `posixmodule.c(15856)`–`(15860)` for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. Inspection confirms these are exported as `_LOAD_LIBRARY_SEARCH_*` constants in the Windows `os` module initialization block. Defining fallback values or omitting exports changes the Win9x-visible API contract, which remains unresolved; no speculative source/test changes or coding-agent delegation were appropriate. Later C89 diagnostics start at line 16173 and remain a separate blocker. This run was diagnostics-only.

Files changed by this run: `PORT_STATUS.md` only. All existing nested CPython edits and generated patch were preserved.

Exact commands and results:

| Command | Exit/result |
|---|---|
| `git status --short --branch && git -C cpython status --short --branch && git -C cpython rev-parse HEAD && git -C cpython describe --tags --exact-match` | 0; outer checkout already had the three modified files; nested checkout is detached at `v3.11.16` / `41388c9cb160d0886d5ca00d2e6c878260a8a4549`, with pre-existing port edits. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; `_blake2/blake2s_impl.c` compiled; 39/40 sources compiled. First stable errors are the five C2065 constants above. Distinct later C89 diagnostics begin at `posixmodule.c(16173)`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; shell syntax checks and all applicable regression suites passed. |
| `git -C cpython diff --check && cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | 0; nested whitespace check passed and compatibility patch matches the complete nested diff byte-for-byte. |
| `git diff --check -- . ':!compat/msvc600/cpython-3.11.16-vc6-headers.patch'` | 0; non-generated outer diff check passed. |

Compiler-probe progress only. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next: establish the intended Win9x API behavior for the five exported loader-search constants; only then add a focused failing test before changing source. Keep the later C89 diagnostics separate.

---

## Latest revision (diagnostic-only forced frontier re-probe)

Date: 2026-09-25 06:58 UTC

Read `PORT_STATUS.md`, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved the pre-existing outer modifications to `PORT_STATUS.md`, the generated compatibility patch, and the frontier test; the detached `cpython/` checkout also contains extensive local port edits. No reset, clean, stash, discard, overwrite of unrelated changes, commit, push, or publication occurred. CPython remains tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`.

Re-forced the current compiler frontier before considering implementation. The recorded `_blake2/blake2s_impl.c` state remains true, but it is not the current blocker: 39/40 listed sources compile. The first stable blocker remains five C2065 undeclared-identifier diagnostics in `posixmodule.c(15856)`–`(15860)` for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. Later distinct C89 diagnostics begin at line 16173. Inspection confirms these names are exported as `_LOAD_LIBRARY_SEARCH_*` constants from the Windows `os` module initialization block. Adding numeric values or omitting exports would make a Win9x-visible API behavior choice that the available evidence does not resolve. Per scope, this run therefore performed diagnostics only; no coding agent or implementation/test edit was appropriate.

Files changed by this run: `PORT_STATUS.md` only. Existing CPython changes and generated patch were left intact.

Exact commands and results:

| Command | Exit/result |
|---|---|
| `git status --short --branch && git rev-parse --show-toplevel && git rev-parse HEAD && git remote -v` | 0; outer checkout on `main...gitea/main` with the three pre-existing modified files; no publication performed. |
| `git -C cpython status --short --branch && git -C cpython rev-parse HEAD && git -C cpython describe --tags --exact-match` | 0; nested checkout remains detached at `v3.11.16` / `41388c9cb160d0886d5ca00d2e6c878260a8a4549`, with pre-existing source edits. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; `_blake2/blake2s_impl.c` compiled; 39/40 sources compiled. First stable errors are the five C2065 loader-search constant errors at `posixmodule.c(15856)`–`(15860)`. Later distinct C89 errors start at 16173. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; syntax checks and all applicable regression suites passed. |
| `git -C cpython diff --check; cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch; git diff --check -- . ':!compat/msvc600/cpython-3.11.16-vc6-headers.patch'` | Each check returned 0; nested whitespace check passed, generated patch matches the complete nested diff byte-for-byte, and non-generated outer diff check passed. |

Compiler-probe progress only. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next: resolve the intended Win9x behavior/API contract for the five exported loader-search constants; only then write a focused failing regression test before any source change. Keep the later C89 diagnostics separate.

---

## Latest revision (forced frontier re-probe; loader-search constants remain first blocker)

Date: 2026-09-25 UTC

Read `PORT_STATUS.md`, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. The outer checkout already had modifications to `PORT_STATUS.md`, the generated compatibility patch, and the frontier regression script; the detached `cpython/` checkout had extensive local port edits. Preserved all prior state. Baseline is still tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. No reset, clean, stash, discard, commit, push, or publication occurred.

Forced a fresh source-list probe before implementation. The recorded `_blake2/blake2s_impl.c` compile state is still true, but `_blake2` is not the current blocker: 39/40 sources compile, and the first stable blocker is `posixmodule.c` with five C2065 errors at lines 15856–15860 for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. The later C89 errors beginning at line 16173 are distinct and remain untouched. Since these constants are exported through the Windows `os` module and their intended Win9x-visible behavior remains unresolved, implementation would be speculative. Therefore this run was diagnostic-only; no coding agent or source/test edit was appropriate.

Files changed by this run: `PORT_STATUS.md` only. The existing compatibility patch and all nested source changes were preserved.

Exact commands and results:

| Command | Exit/result |
|---|---|
| `git status --short --branch && git -C cpython status --short --branch && git -C cpython rev-parse HEAD && git -C cpython describe --tags --exact-match` | 0; pre-existing local modifications preserved; CPython remains detached at `v3.11.16` / `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; 39/40 sources compiled, including `_blake2/blake2s_impl.c`. First stable diagnostics: five C2065 loader-search constants at `posixmodule.c(15856)`–`(15860)`; distinct later errors start at 16173. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all wine cmd /c 'call Z:\\home\\ubuntu\\Organized\\Legacy-Ports\\Projects\\python-win9x\\MSVC600\\VC98\\Bin\\VCVARS32.BAT && cl'` | 0; `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; shell syntax and all applicable regression suites passed. |

Compiler-probe progress only. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next: determine and document intended Win9x behavior for these five loader-search constants, then add a focused failing test before any source edit. Keep the later C89 diagnostics separate.

---

## Latest revision (diagnostic-only confirmation of Win32 loader-search constants frontier)

Date: 2026-09-25 00:46 UTC

Baseline verified as CPython `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Read this status, `README.md`, and the legacy-toolchain reference before probing. The outer checkout already contained local modifications to `PORT_STATUS.md`, the generated compatibility patch, and the frontier regression script; the detached `cpython/` checkout already contained extensive port edits. Preserved all prior state. No reset, clean, stash, discard, commit, push, or publication occurred. The exact compiler banner was re-verified as `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86` through Wine.

The recorded mathmodule frontier was not current: a forced fresh source-list probe still compiled `_blake2/blake2s_impl.c` but found `posixmodule.c` as the first blocker, with 39 of 40 sources compiling. First stable diagnostics are five C2065 errors at `posixmodule.c(15856)`–`(15860)` for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. Inspection confirms these are exported as `_LOAD_LIBRARY_SEARCH_*` constants from the Windows `os` module initialization block. Defining arbitrary fallback values or omitting these exports changes the Win9x-visible API surface, and the intended contract is not established by the available evidence. Therefore this run made diagnostics only; no implementation or coding-agent delegation was appropriate. Later C89 diagnostics (first at line 16173) are separate and remain untouched.

Files changed by this run: `PORT_STATUS.md` only. No CPython source, test, or compatibility patch was modified in this run.

Exact commands and results:

| Command | Exit/result |
|---|---|
| `git status --short --branch && git -C cpython status --short --branch && git -C cpython rev-parse HEAD && git -C cpython describe --tags --exact-match` | 0; pre-existing changes preserved; CPython detached at `v3.11.16` / `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; `_blake2/blake2s_impl.c` compiled; 39/40 sources compiled. First stable diagnostics are the five C2065 loader-search constants at `posixmodule.c(15856)`–`(15860)`; later C89 diagnostics follow. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all wine cmd /c 'call Z:\home\ubuntu\Organized\Legacy-Ports\Projects\python-win9x\MSVC600\VC98\Bin\VCVARS32.BAT && cl'` | 0; verified compiler banner as stated above. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; syntax checks and all applicable regression suites passed. |
| `git -C cpython diff --check && cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch && git diff --check -- . ':!compat/msvc600/cpython-3.11.16-vc6-headers.patch'` | 0; nested diff check passed, generated compatibility patch reproduces the full nested diff byte-for-byte, and non-generated outer diff check passed. |

Compiler-probe progress only. No `pythoncore.dll`/`python.exe` link, Wine interpreter execution, or real Windows 98 SE execution is verified. Next step: establish the intended Win9x `os` API behavior for the five Windows-7-era loader-search constants, then add a focused failing test before any source change. Preserve the later C89 diagnostics as separate frontiers.

---

# Port Status — CPython 3.11.16 to Windows 98 SE

## Latest revision (diagnostic-only confirmation of loader search constants frontier)

Date: 2026-09-24 22:41 UTC

Baseline verified as CPython `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before work, read this status, `README.md`, and the active-profile `legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md`. The outer checkout already contained modifications to `PORT_STATUS.md`, the generated compatibility patch, and the frontier test; the detached `cpython/` checkout had extensive local modifications. Preserved all existing work; no reset, clean, stash, discard, commit, push, or publication occurred. MSVC6 remains external/local-only.

Force-re-probed the recorded frontier before any implementation. The state remains true: `_blake2/blake2s_impl.c` compiled and the source-list probe compiled 39 of 40 sources. First stable diagnostics remain the five C2065 errors at `posixmodule.c(15856)`–`(15860)` for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. The subsequent C89 errors beginning at line 16173 are later, distinct blockers. The loader flags are exported in the Windows `os` module initialization, so choosing fallback numeric constants versus omitting API exports changes the Win9x-visible behavior. No source/test/patch implementation was appropriate absent a resolved API contract; no coding agent was delegated for this diagnostic-only run.

Files changed by this run: `PORT_STATUS.md` only. No CPython source, regression test, or generated compatibility patch was modified.

Exact commands and results:

| Command | Exit/result |
|---|---|
| `git status --short --branch && git -C cpython status --short --branch && git -C cpython rev-parse HEAD && git -C cpython describe --tags --exact-match` | 0; outer pre-existing modifications preserved; detached CPython checkout at baseline commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`, tag `v3.11.16`. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; `_blake2/blake2s_impl.c` compiled; 39/40 compiled. First errors are the five loader-search constants at `posixmodule.c(15856)`–`(15860)`; later C89 diagnostics follow. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; syntax checks and all applicable regression suites passed. |
| `git -C cpython diff --check && cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch && git diff --check -- . ':!compat/msvc600/cpython-3.11.16-vc6-headers.patch'` | 0; nested diff check passed, generated patch still reproduces complete nested diff byte-for-byte, and non-generated outer diff check passed. |

Compiler-probe progress only. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next step remains resolving the intended Win9x `os` API behavior for these Windows-7-era loader flags and then writing a focused failing test before changing source. Keep later C89 diagnostics separate.

---

## Latest revision (diagnostic-only loader search constants frontier)

Date: 2026-09-24 20:37 UTC

Baseline verified as CPython `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before work, read this status, `README.md`, and `legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md`. The outer checkout already had modifications to `PORT_STATUS.md`, the generated compatibility patch, and the frontier test; the detached `cpython/` checkout had extensive local modifications. Preserved all existing work. No reset, clean, stash, discard, commit, push, or publication occurred. The legacy compiler remains external/local-only.

The previously recorded frontier was force-re-probed and remained true: `_blake2/blake2s_impl.c` compiled and the probe compiled 39 of 40 listed sources. First stable diagnostics are in `posixmodule.c` lines 15856–15860: C2065 for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. Source inspection shows these are exported as `os` module constants in the `MS_WINDOWS` module-init block. Unlike an isolated compile-time spelling, deciding whether to define numeric fallback values or omit these exports changes the Win9x-visible API contract; no behavior choice was made without runtime evidence. Later C89 diagnostics beginning at 16173 are separate and were not addressed. No implementation slice or coding-agent delegation was appropriate until the API behavior is resolved; this run was diagnostics only.

Files changed by this run: `PORT_STATUS.md` only. No CPython source, regression test, or compatibility patch was modified.

Exact commands and results:

| Command | Exit/result |
|---|---|
| `git -C cpython status --short --branch && git -C cpython rev-parse HEAD && git -C cpython describe --tags --exact-match` | 0; detached checkout at baseline commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`, tag `v3.11.16`, with pre-existing modified source files. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; `_blake2/blake2s_impl.c` compiled; 39/40 sources compiled. First errors are the five C2065 loader-search constants at `posixmodule.c(15856)`–`(15860)`; later C89 diagnostics follow. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; all applicable suites passed. |
| `cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | 0; tracked compatibility patch still exactly reproduces the full nested diff. |
| `git -C cpython diff --check` | 0. |

Compiler-probe progress only. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next step: establish an explicit intended `os` API behavior for these Windows-7-era loader flags on Win9x, then add a focused regression test before any source change. Preserve the later C89 blocker as a separate frontier.

---

## Latest revision (VC6 wait-status C89 declaration slice)

Date: 2026-09-24 UTC

Baseline: CPython `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before work, read this status, `README.md`, and the active-profile legacy-toolchain reference. Existing outer modifications to this status, generated compatibility patch, and frontier test were preserved; the detached `cpython/` checkout also contained extensive local edits. No reset, clean, stash, discard, commit, push, or publication occurred. A single focused coding-agent delegation was attempted and could not launch because the runtime lacks the `anthropic` package; this slice was completed directly, without claiming independent review.

The recorded frontier was force-re-probed before editing and remained true: `_blake2/blake2s_impl.c` compiled and 39/40 listed sources compiled. First blocker remained `posixmodule.c(15107)` C2143 (`missing ';' before 'type'`) for the post-statement `exitcode` declaration; C2065 for `exitcode` at 15110 and parser cascades followed. Following TDD, updated the focused Windows wait-status assertion first and ran the regression script against unchanged production code; expected RED, exit 1, at the assertion that the opening C89 declaration group was missing. Hoisted only `unsigned PY_LONG_LONG status` and `exitcode` to the Windows branch's declaration group; kept both initializations at their original evaluation points. Adjusted the assertion to extract the full conditional function and verify declaration placement and conversion/error order. Focused test then passed GREEN. Two intermediate assertion-harness runs exposed extraction/expected-text mismatches; corrected the test only, with no further production changes.

Files changed in this slice:

- `cpython/Modules/posixmodule.c` — declaration ordering in `os_waitstatus_to_exitcode_impl()` Windows branch only.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — focused declaration/order assertion.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested CPython diff and verified byte-for-byte.
- `PORT_STATUS.md` — this record.

Exact commands and results:

| Command | Exit/result |
|---|---|
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before edit | 2; 39/40 compiled, `_blake2/blake2s_impl.c` compiled. First diagnostics `posixmodule.c(15107)` C2143 and `(15110)` C2065 `exitcode`; later cascades. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after assertion edit, before production edit | 1; expected RED at the Windows wait-status C89 assertion. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after implementation and assertion correction | 0; `ALL TESTS PASSED`. |
| Forced frontier probe after edit (same command as above) | 2; the `exitcode` C2143/C2065 family is gone. New first stable errors are C2065 at `posixmodule.c(15856)`–`(15860)` for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `...APPLICATION_DIR`, `...SYSTEM32`, `...USER_DIRS`, and `...DLL_LOAD_DIR`. Still 39/40; no later family changed. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh` | 0; shell syntax checks and all applicable regression suites passed. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch && git -C cpython diff --check && cmp <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch && git diff --check -- . ':!compat/msvc600/cpython-3.11.16-vc6-headers.patch'` | 0; complete nested diff matches generated patch byte-for-byte; nested and non-generated outer whitespace checks passed. |

Compiler-probe progress only. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next frontier: inspect the `LOAD_LIBRARY_SEARCH_*` constants at `posixmodule.c(15856)` and re-probe before deciding a separate narrow slice.

---

## Latest revision (VC6 wait-status 64-bit spelling slice)

Date: 2026-09-24 UTC

Baseline remains CPython `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before editing, read this status, `README.md`, and `legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` under the active Hermes profile. The outer checkout already contained local modifications to this status, the generated compatibility patch, and the frontier regression script. The detached `cpython/` checkout had extensive existing port edits. All local state was preserved; no reset, clean, stash, discard, commit, push, or publication occurred. The requested single focused coding-agent delegation was attempted and could not launch because the runtime lacks the `anthropic` Python package; direct work continued on the single evidenced slice.

The recorded `_blake2/blake2s_impl.c` frontier was force-re-probed before edits and remained true: that source compiled, with 39 of 40 listed sources compiled. First stable blocker: `posixmodule.c(15102)`, then C2632 at 15103 and 15107 (`'long' followed by 'long' is illegal`) in `os_waitstatus_to_exitcode_impl()`'s Windows branch. Following TDD, added an assertion to `scripts/vc6-probe-pythoncore-frontier.test.sh` and ran it against unchanged source; expected RED, exit 1. Replaced the three `unsigned long long` type spellings (two declarations and the error-sentinel cast) with `unsigned PY_LONG_LONG`, preserving unsigned semantics and conversion/return behavior. The focused assertion passed GREEN. No independent review is claimed.

Files changed in this slice:

- `cpython/Modules/posixmodule.c` — VC6-compatible unsigned 64-bit type spellings in `os_waitstatus_to_exitcode_impl()` only.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — focused assertion for the Windows branch type spellings and preserved conversion/result calls.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested CPython diff and byte-compared.
- `PORT_STATUS.md` — this entry.

Exact commands and results:

| Command | Exit/result |
|---|---|
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before edit | 2; `_blake2/blake2s_impl.c` compiled; 39/40 compiled. C2632 at `posixmodule.c(15102)`, `(15103)`, `(15107)`; following cascades. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` with new assertion, before source edit | 1; expected RED: Windows wait-status conversion lacked the required VC6 spelling. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | 0; `ALL TESTS PASSED`, including the new assertion. |
| Same forced frontier probe after source edit | 2; the C2632 long-long diagnostics are gone. New first diagnostic: `posixmodule.c(15107)` C2143 (missing `;` before `type`) for the `exitcode` declaration after the preceding `if`; C2065 at 15110 and parser cascades follow. Separate later `LOAD_LIBRARY_SEARCH_*` SDK constants and later C89 errors remain untouched. Summary `total=40 compiled=39 cached=0 skipped=0`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh` | 0; shell syntax and all applicable regression suites passed. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch && git -C cpython diff --check && cmp <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch && git diff --check -- . ':!compat/msvc600/cpython-3.11.16-vc6-headers.patch'` | 0; complete patch byte-matches the nested diff; nested and non-generated outer whitespace checks passed. |

Compiler-probe progress only. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next narrow frontier: inspect/re-probe the C89 declaration-order defect at `posixmodule.c(15107)` (`exitcode`) and add its focused failing assertion before any source change. Do not combine it with later API constants or unrelated errors.

---

## Latest revision (VC6 DLL-directory API fallback slice)

Date: 2026-09-24 UTC

Baseline: CPython `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before editing, read this status, `README.md`, and `legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` (located under the active Hermes profile skills). The outer checkout already had local changes in `PORT_STATUS.md`, `compat/msvc600/cpython-3.11.16-vc6-headers.patch`, and `scripts/vc6-probe-pythoncore-frontier.test.sh`; the detached `cpython/` checkout had extensive local port edits. All pre-existing work was preserved. No reset, clean, stash, discard, commit, push, or publication occurred. MSVC600 remains external/local-only through Wine (`WINEPREFIX=/home/ubuntu/.wine-win9xport`); compiler banner: `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The previously recorded `_blake2/blake2s_impl.c` frontier was force-re-probed before edits and remained true: it compiled, as did 39 of 40 listed sources. First blocker was `posixmodule.c(14905)` in `typedef DLL_DIRECTORY_COOKIE (WINAPI *PAddDllDirectory)(PCWSTR newDirectory);`: C2143 missing `)` before `__stdcall`, C2143 missing `{` before `__stdcall`, C2059 at `)`, and C2165 (`left-side modifier`); the companion typedef and unavailable API types/functions then cascaded. These are Windows 7 DLL-directory APIs absent on Win9x. The requested one focused coding-agent delegation was attempted, but failed to launch because the runtime lacks Python package `anthropic`; implementation proceeded directly as a single narrow slice.

Following TDD, the focused regression assertion was added first and run against unchanged production source: expected RED, exit 1 (`VC6 os.add_dll_directory fallback missing`). The minimal source edit gates the API typedefs and both implementation bodies for MSVC6, returning `NotImplementedError` from `os._add_dll_directory` and `os._remove_dll_directory`; modern compiler paths remain intact. The focused suite then passed GREEN. This explicitly acknowledges the unavailable Win7 functionality rather than inventing compatibility declarations.

Files changed in this slice:

- `cpython/Modules/posixmodule.c` — VC6 guard around DLL-directory function pointer typedefs and explicit unsupported-operation errors in the add/remove implementations.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — focused structural regression assertion for both functions and the retained modern branch.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested CPython diff and verified byte-for-byte.
- `PORT_STATUS.md` — this entry.

Exact commands and results:

| Command | Exit/result |
|---|---|
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all wine cmd /c 'call Z:\home\ubuntu\Organized\Legacy-Ports\Projects\python-win9x\MSVC600\VC98\Bin\VCVARS32.BAT && cl'` | 0; compiler banner recorded above. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before edit | 2; 39/40 compiled; first diagnostic family at `posixmodule.c(14905)` described above. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding assertion, before source edit | 1; expected RED: `VC6 os.add_dll_directory fallback missing`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | 0; `ALL TESTS PASSED`, including add/remove DLL-directory assertion. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after edit | 2; `_blake2/blake2s_impl.c` compiled and 39/40 listed sources compiled. DLL-directory diagnostics are gone. New first blocker is `posixmodule.c(15102)` C2632 (`'long' followed by 'long' is illegal`) in `os_waitstatus_to_exitcode_impl()`; further C2632 diagnostics at 15103 and 15107 and their cascades. Summary `total=40 compiled=39 cached=0 skipped=0`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh` | 0; shell syntax and all applicable regression suites passed. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch && git -C cpython diff --check && cmp <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch && git diff --check -- . ':!compat/msvc600/cpython-3.11.16-vc6-headers.patch'` | 0; generated patch matches full nested diff byte-for-byte; nested and non-generated outer whitespace checks passed. |

Compiler-probe progress only. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution has been verified. Next narrow frontier: inspect/re-probe `os_waitstatus_to_exitcode_impl()` at `posixmodule.c(15102)` for VC6 64-bit spelling/declaration blockers; do not fold later unrelated errors into that slice.

---

## Latest revision (diagnostic-only DLL-directory API frontier)

Date: 2026-09-24 UTC

Baseline: CPython `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Read this status, `README.md`, and `legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before work. The outer checkout already had uncommitted changes to this status, the generated compatibility patch, and the frontier test; the nested `cpython/` checkout had extensive local source edits. All pre-existing work was preserved. No reset, clean, stash, discard, commit, push, or publication occurred. MSVC6 is the external `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`, invoked through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`.

The recorded `_blake2/blake2s_impl.c` frontier was force-re-probed and remained true: that source compiled and 39 of 40 listed sources compiled. First stable diagnostics are at `posixmodule.c(14905)` for `typedef DLL_DIRECTORY_COOKIE (WINAPI *PAddDllDirectory)(PCWSTR newDirectory);`: C2143 missing `)` before `__stdcall`, C2143 missing `{` before `__stdcall`, C2059 at `)`, and C2165 (`left-side modifier`). The immediately following companion typedef at 14906 fails similarly. Subsequent errors identify the absent VC98/Win9x API types and function (`DLL_DIRECTORY_COOKIE`, `AddDllDirectory`) at 14928–14929, followed by cascades. Source inspection confirms these helpers dynamically call Windows 7 DLL-directory APIs; Win9x does not provide that API. A safe behavior-preserving local compiler shim is not established: any port fix must explicitly decide the unavailable API's behavior and account for both add/remove helpers and generated module exposure. Therefore this run made diagnostics only rather than a speculative source change. The requested single coding subagent could not launch because the runtime requires the unavailable Python `anthropic` package; no external coding CLI was used to bypass that failed delegation.

Files changed by this run: `PORT_STATUS.md` only. No CPython source, test, or compatibility patch was modified in this run.

Exact commands and results:

| Command | Exit/result |
|---|---|
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; `_blake2/blake2s_impl.c` compiled, 39/40 sources compiled, first stable error family at `posixmodule.c(14905)` as above; summary `total=40 compiled=39 cached=0 skipped=0`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; syntax checks and all applicable regression suites passed. |
| `git -C cpython diff --check && cmp <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch && git diff --check -- . ':!compat/msvc600/cpython-3.11.16-vc6-headers.patch'` | 0; nested diff whitespace check, patch byte-for-byte comparison, and non-generated outer diff whitespace check passed. |

This is compiler-probe progress only. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next frontier requires deciding and testing explicit Win9x behavior for `os.add_dll_directory` and `os.remove_dll_directory`; until then, do not mask the compiler errors with invented API declarations.

---

## Latest revision (`os_scandir_impl()` VC6 C89 declaration slice)

Date: 2026-09-24 UTC

Baseline: CPython `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Read this status, `README.md`, and `legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before work. The outer checkout and detached `cpython/` checkout already had extensive local changes; all were preserved. No reset, clean, stash, discard, commit, push, or publication occurred. The requested single focused coding subagent could not launch because the runtime requires the unavailable Python `anthropic` package. Direct implementation followed after confirming the exact frontier. Codex CLI `0.153.4` and authenticated status were verified, but no external coding agent ran; no independent review is claimed.

The recorded `_blake2/blake2s_impl.c` frontier was force-re-probed first and remained applicable: it compiled; 39 of 40 sources compiled. First stable diagnostics were `posixmodule.c(14689)` C2275/C2065 for the post-statement `PyObject *ScandirIteratorType` declaration in `os_scandir_impl()`. Following TDD, an exact-function assertion was added, then corrected to include the existing clinic marker. With production source still unchanged, the corrected test failed RED (exit 1) specifically because the type local was declared after the audit statement. The minimal source change hoists only `PyObject *ScandirIteratorType;` into the opening declaration group and changes its original initializer into an assignment at its existing post-audit point. Audit, iterator allocation, and error/cleanup order remain unchanged.

Files changed in this slice:

- `cpython/Modules/posixmodule.c` — C89 declaration ordering in `os_scandir_impl()` only.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — focused exact-function structural assertion.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested CPython diff and verified byte-for-byte.
- `PORT_STATUS.md` — this milestone entry.

Exact commands and results:

| Command | Exit/result |
|---|---|
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before edit | 2; `_blake2/blake2s_impl.c` compiled; 39/40 compiled; first diagnostics `posixmodule.c(14689)` C2275/C2065 for `PyObject ScandirIteratorType`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding/correcting assertion, before source edit | 1; expected RED: `os_scandir_impl must hoist ScandirIteratorType into its opening C89 declaration group and preserve audit-before-type-lookup order`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | 0; GREEN; all structural checks passed. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after edit | 2; original 14689 declaration diagnostics are gone; the next distinct first diagnostic is `posixmodule.c(14905)` C2143/C2059/C2165 around `__stdcall` in later DLL-directory API code. Summary `total=40 compiled=39 cached=0 skipped=0`; no later family was changed. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh` | 0; shell syntax and all applicable regression suites passed. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch && git -C cpython diff --check && cmp <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch && git diff --check -- . ':!compat/msvc600/cpython-3.11.16-vc6-headers.patch'` | 0; complete compatibility patch matches the nested diff byte-for-byte; nested and non-generated outer diffs pass whitespace checks. |

Compiler-probe progress only: `_blake2/blake2s_impl.c` and 39/40 listed sources compile, but `posixmodule.c` still blocks. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next narrow frontier: inspect/re-probe the `posixmodule.c(14905)` `__stdcall`/DLL-directory diagnostics; do not fold in later independent diagnostics.

---

## Latest revision (`ScandirIterator_dealloc()` VC6 C89 declaration slice)

Date: 2026-09-24 07:52 UTC

Baseline: CPython `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before work, read this status, `README.md`, and `legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md`. The outer checkout and detached `cpython/` checkout already contained local changes; all were preserved. No reset, clean, stash, discard, commit, push, or publication occurred. Codex CLI `0.153.4` was present, but the requested single Hermes coding subagent could not launch because the runtime lacks the `anthropic` package; no child changes were used. I completed this narrow slice directly and do not claim independent review.

The recorded `_blake2/blake2s_impl.c` frontier was force-re-probed before editing and remained applicable: it compiled; 39 of 40 sources compiled. The first stable diagnostic family was `posixmodule.c(14623)` C2275/C2146/C2065 for `freefunc free_func` in `ScandirIterator_dealloc()`. Following TDD, the focused assertion was added first and observed RED (exit 1), specifically because the callback declaration followed the finalizer statement. The minimal source change hoists only `freefunc free_func;` into the opening declaration group and converts its original initializer to an assignment after the finalizer check; finalizer, callback, and decref order is unchanged. The assertion passed GREEN (exit 0).

Files changed in this slice:

- `cpython/Modules/posixmodule.c` — C89 declaration ordering in `ScandirIterator_dealloc()` only.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — focused exact-function structural assertion.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested CPython diff and verified byte-for-byte.
- `PORT_STATUS.md` — this milestone entry.

Exact commands and results:

| Command | Exit/result |
|---|---|
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before edit | 2; `_blake2/blake2s_impl.c` compiled; 39/40 compiled; first diagnostics `posixmodule.c(14623)` C2275/C2146/C2065 for `freefunc free_func`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding assertion, before source edit | 1; expected RED: assertion that `ScandirIterator_dealloc` must declare `free_func` before statements and preserve finalizer/free/decref order. |
| Same focused test after source edit | 0; GREEN. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after edit | 2; the `freefunc` diagnostic family at 14623 is gone. New first stable diagnostics are `posixmodule.c(14689)` C2275/C2065 for `PyObject ScandirIteratorType`; later distinct blockers remain. Summary `total=40 compiled=39 cached=0 skipped=0`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh` | 0; shell syntax and all applicable regression suites passed. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch && git -C cpython diff --check && cmp <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch && git diff --check -- . ':!compat/msvc600/cpython-3.11.16-vc6-headers.patch'` | 0; complete compatibility patch matches the nested diff byte-for-byte; nested and non-generated outer diffs pass whitespace checks. |

Compiler-probe progress only: `_blake2/blake2s_impl.c` and 39/40 listed sources compile, but `posixmodule.c` still blocks. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next narrow frontier: inspect/re-probe `posixmodule.c(14689)` C89 declaration of `ScandirIteratorType`; do not fold in later API/language diagnostics.

---

## Latest revision (`os_DirEntry_inode_impl()` VC6 64-bit type spelling)

Date: 2026-09-24 05:45 UTC

Baseline: CPython `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before edits, inspected this status, `README.md`, and the requested legacy-toolchain reference path; the reference file was absent from the active/default skills directories and project. The skill instructions supplied in the task were followed. The outer checkout and detached `cpython/` checkout had pre-existing local changes, preserved without reset, clean, stash, discard, commit, push, or publication. Codex CLI `0.153.4` was available and used as the single focused coding lane; its scope was limited to `posixmodule.c` and the frontier test. The CPython tag/commit were unchanged.

The recorded `_blake2/blake2s_impl.c` frontier was force-re-probed before implementation and remained true: `_blake2/blake2s_impl.c` compiled; the first stable error family was `posixmodule.c(14152)` C2632, because VC6 rejects `long long` in `os_DirEntry_inode_impl()`'s Windows `static_assert`. The child confirmed the existing Windows `PY_LONG_LONG` definition resolves to `__int64` and matches the unsigned type accepted by `PyLong_FromUnsignedLongLong`. Following TDD, the focused assertion covering both Windows/POSIX inode `static_assert`s was added first and observed RED (exit 1). The minimal source edit changed only the two asserted type spellings from `unsigned long long` to `unsigned PY_LONG_LONG`; the runtime return expressions and diagnostic strings are unchanged. The focused assertion then passed GREEN (exit 0).

Files changed in this slice:

- `cpython/Modules/posixmodule.c` — two `os_DirEntry_inode_impl()` compile-time assertion type spellings.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — assertion requires `unsigned PY_LONG_LONG` in both branches and updates the exact-function expectation.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested diff and compared byte-for-byte.
- `PORT_STATUS.md` — this milestone entry.

Exact commands and results:

| Command | Exit/result |
|---|---|
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before edit | 2; 39/40 compiled; `_blake2/blake2s_impl.c` compiled; first stable diagnostic `posixmodule.c(14152)` C2632 (`'long' followed by 'long' is illegal`), with later separate blockers. |
| Focused inode assertion before source edit (`bash /tmp/direntry-inode-tdd/run-focused.sh`, coding lane) | 1; expected RED: `AssertionError: DirEntry.inode static_asserts must both use unsigned PY_LONG_LONG`. |
| Same focused inode assertion after source edit (coding lane) | 0; `ok - DirEntry.inode preserves C89 declarations and decoder/stat/errno/cleanup order`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.test.sh` (coding lane) | 0. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` | 0; all structural checks passed, including both inode assertions. Its bounded live integration check compiled the first source, `getpath.c`, successfully; it is not the full frontier probe. |
| Fresh forced frontier probe after edit, with output captured in `/home/ubuntu/.hermes/profiles/maxwell/cache/scratch/vc6-frontier-run.log` | 2; `_blake2/blake2s_impl.c` compiled; C2632 diagnostics at `posixmodule.c(14152)` are gone. New first stable blocker is `posixmodule.c(14623)` C2275/C2146/C2065 for `freefunc free_func` in the later scandir code. Later diagnostics remain; summary `total=40 compiled=39 cached=0 skipped=0`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh` | 0; all applicable regression suites passed. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch && git -C cpython diff --check && cmp <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch && git diff --check -- . ':!compat/msvc600/cpython-3.11.16-vc6-headers.patch'` | 0; complete nested diff reproduced byte-for-byte; nested and non-generated outer diffs pass whitespace checks. |

Compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next narrow frontier: inspect and re-probe `posixmodule.c(14623)` `freefunc` C89 declaration before choosing another slice; do not fold in later API/language diagnostics. No commit or publication occurred.

---

## Latest revision (`os_DirEntry_inode_impl()` VC6 C89 declarations)

Date: 2026-09-24 03:34 UTC

Baseline: CPython `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before this slice, the top-level checkout already had local changes to `PORT_STATUS.md`, the compatibility patch, and the frontier test; the detached `cpython/` checkout had extensive source modifications. These were preserved. No reset, clean, stash, discard, commit, push, or publication occurred. The provided legacy-toolchain skill reference file was not present at either expected profile/default skill path or in the project; work followed the full instructions supplied in the task. One focused Codex coding-agent lane implemented the slice; the forced probe and applicable regression suites were rerun directly. No independent reviewer is claimed.

The recorded `_blake2/blake2s_impl.c` frontier was force-re-probed before editing and remained the active source-list frontier: it compiled, with `total=40 compiled=39 cached=0 skipped=0`. First stable diagnostics were in `os_DirEntry_inode_impl()` at `posixmodule.c(14124)` C2143 before `const`, followed by C2065 for `path` at 14125, C2143 at 14126, and C2065 for `saved_errno` at 14139. Following TDD, a focused whole-function structural assertion was added before the source edit and observed RED (exit 1). The narrow edit hoisted only the branch-specific `path` declarations and shared `saved_errno` declaration in the existing `if (!self->got_file_index)` block, keeping `const wchar_t *` versus `wchar_t *` under the existing preprocessor branches. Assignments remain at their original evaluation points: after successful decoding, around `LSTAT`, with errno saved before decref/free cleanup. The focused assertion then passed.

Files changed in this slice:

- `cpython/Modules/posixmodule.c` — declaration ordering only in `os_DirEntry_inode_impl()`.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — exact-function structural assertion checking C89 declaration placement and branch evaluation/cleanup order.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested CPython diff and compared byte-for-byte.
- `PORT_STATUS.md` — this entry.

Exact commands and results:

| Command | Exit/result |
|---|---|
| Focused exact-function assertion before production edit | 1; expected RED, assertion reports the declaration/order requirement is not yet met. |
| Same focused assertion after edit | 0; assertion passed. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; all applicable suites passed, including the live frontier test's first-source compile check. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before edit | 2; 39 of 40 compiled, `_blake2/blake2s_impl.c` compiled; first errors at `posixmodule.c(14124)` C2143, 14125 C2065, 14126 C2143, and 14139 C2065. |
| Same forced fresh frontier probe after edit | 2; 39 of 40 compiled; the declaration errors at 14124–14139 are gone. New first diagnostic is `posixmodule.c(14152)` C2632 (`long` followed by `long` is illegal), followed by distinct later blockers including `freefunc` declaration errors at 14623 and Win32 API/language errors. Summary `total=40 compiled=39 cached=0 skipped=0`. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch && git -C cpython diff --check && cmp <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | 0; generated patch matches the full nested CPython diff byte-for-byte and nested whitespace check passes. |

This is compiler-probe progress only: no `pythoncore.dll`/`python.exe` link, Wine interpreter execution, or real Windows 98 SE execution is verified. Next narrow frontier: inspect and re-probe the `posixmodule.c(14152)` C2632 64-bit type spelling before choosing another slice; do not fold in later diagnostics.

---

## Latest revision (`DirEntry_test_mode()` VC6 C89 declaration slice)

Date: 2026-09-24 01:25 UTC

Baseline remains CPython `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before work, read `PORT_STATUS.md`, `README.md`, and `legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md`. The top-level and detached `cpython/` checkouts contained pre-existing local modifications; those were preserved. No reset, clean, stash, discard, commit, push, or publication occurred. One focused Codex coding-agent lane worked on this exact slice; I independently reran the compiler frontier and applicable regression suites. No independent human review is claimed.

The recorded `_blake2/blake2s_impl.c` frontier was force-re-probed before the edit and remained applicable: it compiled and 39 of 40 sources compiled. The first stable diagnostic family was `posixmodule.c(14024)` C2275/C2065 for `_posixstate *state` declared after statements in `DirEntry_test_mode()`. Following TDD, a focused exact-function structural assertion was added first and observed RED (exit 1) against the old source; it requires the declaration in the opening C89 declaration group and preserves the state lookup after the stat/error handling. The minimal edit hoisted only `_posixstate *state;` and changed its original initialized declaration into an assignment at the same evaluation point. The full focused frontier test passed afterward.

Files changed in this slice:

- `cpython/Modules/posixmodule.c` — one declaration-order correction in `DirEntry_test_mode()` only.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — focused structural assertion preserving stat/error/state-lookup order.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the full nested CPython diff and verified byte-for-byte.
- `PORT_STATUS.md` — this entry.

Exact commands and results:

| Command | Exit/result |
|---|---|
| Focused assertion before source edit | 1; expected RED because `state` was still declared after executable statements. |
| Focused assertion after source edit (included in full test run) | 0; assertion passed. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` | 0; all assertions passed. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before edit | 2; `_blake2/blake2s_impl.c` compiled, `total=40 compiled=39 cached=0 skipped=0`; first diagnostics at `posixmodule.c(14024)` C2275/C2065 for `_posixstate`/`state`. |
| Same forced fresh frontier probe after edit | 2; `_blake2/blake2s_impl.c` compiled and 39 sources compiled. The 14024 declaration diagnostics are gone. New first stable blocker is `posixmodule.c(14124)` C2143 before `const`, followed by C2065 for `path` at 14125 and later errors. Summary `total=40 compiled=39 cached=0 skipped=0`. |
| Coding-agent sandbox forced-probe attempt | 1; Wine could not create `/run/user/1000/wine/server-801-136fb0/lock` on its read-only filesystem, so no compiler conclusion was taken from that attempt. The same command was rerun directly outside the restricted coding-agent sandbox and produced the compiler result above. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; shell syntax and all applicable regression suites passed. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch && git -C cpython diff --check && cmp <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | 0; patch regenerated; nested diff check and byte-for-byte comparison passed. |
| `git diff --check` over the outer tree | 2; reports trailing spaces in added lines of the generated patch, which reproduces the complete nested source diff exactly. `git diff --check -- . ':!compat/msvc600/cpython-3.11.16-vc6-headers.patch'` | 0; all other outer-tree edits pass the whitespace check. |

Compiler-probe progress only. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next narrow frontier: inspect and force-re-probe the C89 declaration in `DirEntry_fetch_stat()` at `posixmodule.c(14124)` before any further edit. Preserve later distinct blockers; do not broaden into cascades.

---

## Latest revision (`DirEntry_fetch_stat()` VC6 C89 declaration slice)

Date: 2026-09-23 23:17 UTC

Baseline: CPython `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Read this status, `README.md`, and `legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before work. The top-level checkout and detached `cpython/` checkout had pre-existing local changes; these were preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. One focused Codex coding-agent lane handled the implementation and followed TDD; I independently reran the probe and regression gates. No independent human review is claimed.

The recorded frontier was force-re-probed first and remained true: `_blake2/blake2s_impl.c` compiled, 39 of 40 sources compiled, and `posixmodule.c(13870)` first failed on a C89 declaration (`const wchar_t *path`), with analogous path declarations and `saved_errno` later in `DirEntry_fetch_stat()`. The focused structural assertion was added first and observed RED (exit 1) before the source edit; it passed GREEN (exit 0) afterward. The narrow edit hoists `saved_errno` and the Windows/POSIX-specific `path` pointer declarations into the opening declaration group, changing their original initializers into assignments at the same points. Conversion, stat call, errno capture, cleanup, and error behavior remain ordered as before.

Files changed in this slice:

- `cpython/Modules/posixmodule.c` — C89 declarations in `DirEntry_fetch_stat()` only.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — one exact-function structural regression assertion.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the full nested diff and verified byte-for-byte.
- `PORT_STATUS.md` — this entry.

Exact validation commands/results:

| Command | Exit/result |
|---|---|
| Focused assertion before production edit | 1; expected RED, declaration/order assertion failure. |
| Focused assertion after production edit | 0; GREEN. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` | 0; all assertions passed, including `DirEntry_fetch_stat`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before edit | 2; `_blake2/blake2s_impl.c` compiled; `total=40 compiled=39 cached=0 skipped=0`; first diagnostics at `posixmodule.c(13870)` C2143 and later C2065 for `path`. |
| Same forced frontier probe after edit | 2; `_blake2/blake2s_impl.c` compiled and 39 sources compiled; diagnostics at 13870/13901 are gone. New first stable diagnostic is `posixmodule.c(14024)` C2275/C2065 for the post-statement `_posixstate *state` declaration in `DirEntry_test_mode()`. Later cascades include distinct C89/API errors; summary `total=40 compiled=39 cached=0 skipped=0`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; syntax and all applicable regression suites passed. |
| `git -C cpython diff --check` | 0. |
| `git -C cpython diff | cmp - compat/msvc600/cpython-3.11.16-vc6-headers.patch` | 0; patch exactly matches the complete nested diff. |

Compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next frontier: inspect and re-probe the C89 declaration in `DirEntry_test_mode()` at `posixmodule.c(14024)` before any further edit. Preserve the later separate blockers and do not broaden into cascades.

---

## Latest revision (`posixmodule.c` `DirEntry_dealloc()` C89 declaration slice)

Date: 2026-09-23 21:08 UTC

Baseline: CPython `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before work, read `PORT_STATUS.md`, `README.md`, and `legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md`. The top-level and detached CPython checkouts had pre-existing local modifications; all were preserved. No reset, clean, stash, discard, commit, push, or publication occurred. A requested focused coding-agent lane was attempted but could not launch because the Anthropic provider package is unavailable (`anthropic` required); I performed this single narrow slice directly and did not claim independent review.

The recorded frontier was force-re-probed first and remained true: `_blake2/blake2s_impl.c` compiled, 39 sources compiled, and `posixmodule.c(13820)` failed with C2275/C2146/C2065 for the `freefunc free_func` declaration after preceding DECREF statements. Hoisted only the bare `freefunc free_func;` declaration in `DirEntry_dealloc()` and changed its original initializer into an assignment at the same point. Cleanup, slot lookup, invocation, and decref order are unchanged. The focused assertion was introduced first and failed (exit 1) before the source change. The assertion initially also had a test-slice signature mismatch; corrected that harness expectation, then verified it green.

Files changed in this slice:

- `cpython/Modules/posixmodule.c` — one declaration-order fix in `DirEntry_dealloc()`.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — focused regression assertion.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated complete nested diff.
- `PORT_STATUS.md` — this entry.

Exact commands/results:

| Command | Exit/result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before edit | 2; `_blake2/blake2s_impl.c` compiled; total=40, compiled=39, cached=0, skipped=0; first diagnostic family at `posixmodule.c(13820)`, C2275/C2146/C2065 for `freefunc`/`free_func`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` before source edit | 1; expected focused assertion failure. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit and test expectation correction | 0; `ALL TESTS PASSED`, including the new assertion. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after edit | 2; `_blake2/blake2s_impl.c` still compiles and 39 sources compile. The 13820 family is gone. New first diagnostics are `posixmodule.c(13870)` C2143/C2065 for `const`/`path`, with later distinct issues; a second `freefunc` C2275/C2146/C2065 family appears at 14606. Summary total=40, compiled=39, cached=0, skipped=0. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; all applicable regression suites passed. |
| `git -C cpython diff --check` | 0. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch`; byte comparison with `cmp -s <(git -C cpython diff) ...` | 0; patch reproduces the complete nested diff byte-for-byte. |

Compiler-probe progress only: no `pythoncore.dll`/`python.exe` link, Wine interpreter execution, or real Windows 98 SE execution is verified. Next frontier: `posixmodule.c(13870)` C89 declaration diagnostic in the following scandir-related function; inspect and re-probe before any further change. The separate later `freefunc` diagnostic at 14606 remains recorded, not included in this slice.

---

## Latest revision (`posixmodule.c` `os_cpu_count_impl()` VC6 processor-count fallback)

Date: 2026-09-23 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Read `PORT_STATUS.md`, `README.md`, and `legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before work. Existing top-level and detached CPython local modifications were preserved; no reset, clean, stash, discard, commit, push, or publication occurred. One focused Codex coding lane implemented only this slice. The forced probe was re-run directly outside its restricted Wine sandbox after that sandbox could not create Wine's server lock.

The recorded frontier was force-re-probed before implementation and remained true: `_blake2/blake2s_impl.c` compiled, 39 sources compiled, and `posixmodule.c(13612)` failed first because VC6 lacks `ALL_PROCESSOR_GROUPS`. Inspection established that merely defining the constant would still call `GetActiveProcessorCount`, a Windows 7 API unavailable to Win9x. The narrow fix uses the VC98-available `GetSystemInfo()` and `SYSTEM_INFO.dwNumberOfProcessors` only under `_MSC_VER < 1300`; modern builds retain `GetActiveProcessorCount(ALL_PROCESSOR_GROUPS)`. Existing count-or-`None` handling is unchanged.

Files changed for this slice:

- `cpython/Modules/posixmodule.c` — VC6-only processor-count implementation in `os_cpu_count_impl()`.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — focused assertion for the VC6 API path and modern behavior.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested CPython diff.
- `PORT_STATUS.md` — this entry.

**Exact validation commands and results:**

| Command | Exit/result |
|---|---|
| Focused assertion before source edit: `python3 /tmp/vc6-all-processors/focused.py cpython/Modules/posixmodule.c` | 1; expected RED: `AssertionError: os_cpu_count must use VC6-only GetSystemInfo and preserve modern all-group query/count-or-None`. |
| Same focused assertion after source edit | 0. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` | 0; `ALL TESTS PASSED`, including the new assertion. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` (fresh direct run) | 2; `_blake2/blake2s_impl.c` compiled and 39 sources compiled. `ALL_PROCESSOR_GROUPS` diagnostic is gone. First remaining diagnostics are `posixmodule.c(13820)` C2275/C2146/C2065 for `freefunc`/`free_func`, followed by additional distinct C89/API diagnostics. Summary `total=40 compiled=39 cached=0 skipped=0`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh` | 0; shell syntax and all applicable regression suites passed. The delegated restricted-sandbox aggregate attempt failed due to Wine's read-only `/run/user/1000` server-lock path; the direct command above completed successfully. |
| `git -C cpython diff --check` | 0. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch`; `cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | both 0; regenerated patch matches the complete nested diff byte-for-byte. |

Compiler-probe progress only. No `pythoncore.dll`/`python.exe` link, Wine interpreter execution, or real Windows 98 SE execution is verified. Next narrow source frontier: the `posixmodule.c(13820)` C89 `freefunc`/`free_func` declaration family; re-probe before changing it.

## Latest revision (`posixmodule.c` `os_get_terminal_size_impl()` C89 declarations)

Date: 2026-09-23 16:49 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Read `PORT_STATUS.md`, `README.md`, and the legacy-toolchain reference before work. The top-level `main` checkout and detached `cpython/` checkout both contained pre-existing local modifications; all were preserved. No reset, clean, stash, discard, commit, push, or publication occurred. The MSVC600 toolchain remains local-only and external.

The recorded frontier was force-re-probed before implementation: `_blake2/blake2s_impl.c` compiled, 39 sources compiled, and `posixmodule.c(13568)` was the first stable diagnostic family (C2275/C2065 for `TerminalSizeType`), with the following `pos` declaration producing C2143 and later unrelated errors cascading. One focused Codex coding lane performed the TDD edit in the existing checkout. Its first in-sandbox forced probe and aggregate regression command were blocked by Wine's read-only `/run/user/1000` server lock; these were rerun directly outside that sandbox and produced real results below. No independent review is claimed.

The focused test was added and observed RED before the production edit (exit 1: assertion that `os_get_terminal_size_impl` had not yet hoisted its locals). The minimal edit hoists `PyObject *TerminalSizeType` and `int pos` into the opening declaration group and changes only their original initializers to assignments; evaluation, SET_TERMSIZE/error handling, and return order remain unchanged.

Files changed for this slice:

- `cpython/Modules/posixmodule.c` — C89 declaration-order correction in `os_get_terminal_size_impl()` only.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — focused full-function structural assertion.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested CPython diff.
- `PORT_STATUS.md` — this entry.

**Exact validation commands and results:**

| Command | Exit/result |
|---|---|
| Focused test before source edit (coding-lane run) | 1; expected RED assertion: `os_get_terminal_size_impl must declare TerminalSizeType/pos in the opening C89 group...`. |
| Focused test after source edit | 0; assertion passed. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` | 0; `ALL TESTS PASSED`, including the new full-function assertion. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` (fresh direct run) | 2; `_blake2/blake2s_impl.c` compiled; 39 sources compiled; `TerminalSizeType`/`pos` declaration diagnostics are gone. First remaining diagnostic: `posixmodule.c(13612)` C2065, `ALL_PROCESSOR_GROUPS` undeclared; later distinct C89/API diagnostics remain. Summary `total=40 compiled=39 cached=0 skipped=0`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh` | 0; all applicable regression suites passed. The initial in-sandbox attempt exited 1 because Wine could not create its server lock on a read-only filesystem; the direct rerun passed. |
| `git -C cpython diff --check` | 0. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch`; `cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | regeneration succeeded; byte-for-byte comparison exit 0. |

This is compiler-probe progress only. No `pythoncore.dll`/`python.exe` link, Wine interpreter execution, or real Windows 98 SE execution is verified. Next narrow frontier: the separate VC98/Win9x API constant blocker `ALL_PROCESSOR_GROUPS` at `posixmodule.c(13612)`; do not broaden into later cascades.

## Latest revision (`posixmodule.c` VC6 `_MAX_ENV` fallback slice)

Date: 2026-09-23 14:40 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before changing anything, `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` were read. The top-level checkout remains on `main` with pre-existing local changes preserved; the nested `cpython/` checkout remains detached at the baseline with its existing port edits. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains external/local-only through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified compiler banner is `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. The requested one focused coding-agent lane could not launch because the runtime lacks the `anthropic` package; no child changes were used. I performed this one narrow TDD slice directly, preserving all local changes. No independent review is claimed.

The recorded `_blake2/blake2s_impl.c` frontier was force-re-probed first and remained true: `_blake2/blake2s_impl.c` compiled, 39 sources compiled, and `posixmodule.c(11238)` was the first stable blocker, C2065 for unavailable `_MAX_ENV`. The focused assertion was added and observed RED before the source edit, then GREEN after the edit. The smallest VC6-only fallback was added under `MS_WINDOWS` and `_MSC_VER < 1300`, protected by `#ifndef`; modern SDK definitions and the existing environment-length check are unchanged. The next first stable blocker is the distinct `posixmodule.c(13568)` C2275/C2065 family for `TerminalSizeType` (with later legacy API/C89 diagnostics cascading after it).

This slice changed only:

- `cpython/Modules/posixmodule.c` — added a guarded `_MAX_ENV 32767` fallback for the VC98/MSVC6 path.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added one focused structural assertion for the guarded fallback.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report only.

**Exact validation commands and results:**

| Command | Exit/result |
|---|---|
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all wine cmd /c 'call Z:\\\\home\\\\ubuntu\\\\Organized\\\\Legacy-Ports\\\\Projects\\\\python-win9x\\\\MSVC600\\\\VC98\\\\Bin\\\\VCVARS32.BAT && cl'` | 0; banner `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | 2; first blocker `posixmodule.c(11238)` C2065 for `_MAX_ENV`; summary `total=40 compiled=39 cached=0`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit | 1; expected RED: `VC6 _MAX_ENV fallback missing`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit | 2; `_MAX_ENV` blocker is gone; first reported stable blocker is `posixmodule.c(13568)` C2275/C2065 for `TerminalSizeType`; summary `total=40 compiled=39 cached=0`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; all applicable regression suites passed. |
| `git -C cpython diff --check` | 0; nested source diff clean. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch`; `cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | both 0; compatibility patch matches the complete nested source diff byte-for-byte. |

This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine Python execution, and no real Windows 98 SE execution. The next narrow slice is the distinct `TerminalSizeType` C89/API blocker at `posixmodule.c(13568)`; do not broaden into later cascading diagnostics.

## Latest revision (`posixmodule.c` `win32_putenv()` C89 declaration slice)

Date: 2026-09-23 12:33 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before changing anything, `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` were read. The top-level checkout remains on `main` with pre-existing local changes preserved; the nested `cpython/` checkout remains detached at the baseline with its existing port edits. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains external/local-only through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified compiler banner is `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. One focused Codex coding-agent lane implemented this exact TDD slice; no independent review is claimed.

The recorded `_blake2/blake2s_impl.c` frontier was force-re-probed first and remained true: `_blake2/blake2s_impl.c` compiled, 39 sources compiled, and `posixmodule.c(11217)` was the first stable blocker. MSVC6 reported C2275/C2065 for `PyObject *unicode`, followed by the same C89 declaration-order family for `size`, `env`, and `err`. The child first added a focused structural assertion and reported the required RED result (exit 1), then added only the C89 declaration/assignment slice. Afterward, the compiler advanced past those declarations; the next first stable blocker is the distinct VC98 SDK/API gap `posixmodule.c(11238)`, undeclared `_MAX_ENV`.

This slice changed only:

- `cpython/Modules/posixmodule.c` — hoisted `PyObject *unicode`, `Py_ssize_t size`, `wchar_t *env`, and `int err` into `win32_putenv()`'s opening declaration group; changed only the `env` and `err` initializers into assignments at their original points. Evaluation, cleanup, error, and return order are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added one focused structural assertion for the declaration group and preserved body order.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report only.

**Exact validation commands and results:**

| Command | Exit/result |
|---|---|
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all wine cmd /c 'call Z:\\\\home\\\\ubuntu\\\\Organized\\\\Legacy-Ports\\\\Projects\\\\python-win9x\\\\MSVC600\\\\VC98\\\\Bin\\\\VCVARS32.BAT && cl'` | 0; banner `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | 2; first stable blocker `posixmodule.c(11217)` C2275/C2065 for `unicode`; summary `total=40 compiled=39 cached=0`. |
| Focused `win32_putenv()` assertion before source edit | 1; expected RED, as reported by the delegated lane. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit | 2; `posixmodule.c` passed the declaration family; first stable blocker is `posixmodule.c(11238)` C2065 for unavailable `_MAX_ENV`; summary `total=40 compiled=39 cached=0`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; all applicable regression suites passed. |
| `git -C cpython diff --check` | 0; nested source diff clean. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch`; `cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | both 0; compatibility patch matches the complete nested source diff byte-for-byte. |

This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine Python execution, and no real Windows 98 SE execution. The next narrow slice is the distinct VC98 SDK/API blocker at `posixmodule.c(11238)`, `_MAX_ENV`; do not broaden into later cascading diagnostics.

## Latest revision (`posixmodule.c` VC6 `SYMBOLIC_LINK_FLAG_DIRECTORY` fallback slice)

Date: 2026-09-23 10:26 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before changing anything, `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` were read. The top-level checkout remains on `main` with pre-existing local changes preserved; the nested `cpython/` checkout remains detached at the baseline with its existing port edits. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains external/local-only through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified compiler banner is `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. One focused Codex coding-agent lane implemented this exact TDD slice; no independent review is claimed.

The recorded `_blake2/blake2s_impl.c` frontier state was force-re-probed first and remained true: `_blake2/blake2s_impl.c` compiled, 39 sources compiled, and the recorded first blocker was `posixmodule.c(9076)` C2065 for unavailable `SYMBOLIC_LINK_FLAG_DIRECTORY`. The child first added a focused assertion and reported the required RED result, then added only a VC6-guarded fallback for the missing constant while preserving the modern path. After the slice, the compiler advanced past line 9076; the first stable frontier is now the later `os_putenv_impl()` C89 declaration family at `posixmodule.c(11217)`.

This slice changed only:

- `cpython/Modules/posixmodule.c` — added `_MSC_VER < 1300`/`#ifndef` fallback `SYMBOLIC_LINK_FLAG_DIRECTORY 0x1`; modern SDK behavior and the symlink API call remain unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added one focused structural assertion for the guarded fallback.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report only.

**Exact validation commands and results:**

| Command | Exit/result |
|---|---|
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all wine cmd /c 'call Z:\\\\home\\\\ubuntu\\\\Organized\\\\Legacy-Ports\\\\Projects\\\\python-win9x\\\\MSVC600\\\\VC98\\\\Bin\\\\VCVARS32.BAT && cl'` | 0; banner `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. |
| Focused `SYMBOLIC_LINK_FLAG_DIRECTORY` assertion before source edit | 1; expected RED, as reported by the delegated coding lane. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | 0; `ALL TESTS PASSED`, including the new fallback assertion. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit | 2; `_blake2/blake2s_impl.c` compiled and `posixmodule.c` compiled past line 9076. First stable blocker is `posixmodule.c(11217)` C2275/C2065 for later C89 declarations in `os_putenv_impl()`; summary `total=40 compiled=39 cached=0`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; all applicable regression suites passed. |
| `git -C cpython diff --check` | 0; nested source diff clean. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch`; `cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | both 0; compatibility patch matches the complete nested source diff byte-for-byte. |

This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine Python execution, and no real Windows 98 SE execution. The next narrow slice is the distinct C89 declaration-order blocker at `posixmodule.c(11217)` in `os_putenv_impl()`; do not broaden into later cascading diagnostics.

## Latest revision (`posixmodule.c` `os_readlink_impl()` VC6 reparse-API gate slice)

Date: 2026-09-23 08:18 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before changing anything, `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` were read. The top-level checkout remains on `main` with pre-existing local changes preserved; the nested `cpython/` checkout remains detached at the baseline with its existing port edits. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains external/local-only through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified compiler banner is `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. The requested focused coding-agent delegation was attempted but could not launch because the runtime lacks the `anthropic` package; no child changes were used.

The recorded `_blake2/blake2s_impl.c` frontier state was force-re-probed first and remained true: `_blake2/blake2s_impl.c` compiled, 39 sources compiled, and `posixmodule.c(8885)` was the first stable blocker, C2065 for unavailable `FSCTL_GET_REPARSE_POINT`. This run implemented one narrow TDD compatibility slice only: gate the entire Windows `os_readlink_impl()` reparse-point implementation for MSVC6 and return `NotImplementedError` instead of referencing the unavailable VC98 SDK operation. The modern MSVC path remains unchanged.

This slice changed only:

- `cpython/Modules/posixmodule.c` — added `_MSC_VER < 1300` fallback in the `MS_WINDOWS` branch of `os_readlink_impl()`, returning `NotImplementedError`; the modern `DeviceIoControl`/reparse implementation remains under the `#else` branch.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added one focused structural assertion for the VC6 fallback and preservation of the modern `FSCTL_GET_REPARSE_POINT` path.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report only.

**Exact validation commands and results:**

|| Command | Exit/result |
|---|---|
|| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all wine cmd /c 'call Z:\\\\home\\\\ubuntu\\\\Organized\\\\Legacy-Ports\\\\Projects\\\\python-win9x\\\\MSVC600\\\\VC98\\\\Bin\\\\VCVARS32.BAT && cl'` | 0; banner `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. |
|| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | 2; `_blake2/blake2s_impl.c` compiled, 39 sources compiled, first blocker `posixmodule.c(8885)` C2065 for `FSCTL_GET_REPARSE_POINT`; summary `total=40 compiled=39 cached=0`. |
|| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the focused assertion, before source edit | 1; expected RED: `VC6 os_readlink fallback missing`. |
|| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | 0; GREEN, `ALL TESTS PASSED`. |
|| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit | 2; `posixmodule.c` compiled past `FSCTL_GET_REPARSE_POINT`. The next first stable blocker is `posixmodule.c(9076)` C2065 for unavailable `SYMBOLIC_LINK_FLAG_DIRECTORY`; summary `total=40 compiled=39 cached=0`. |
|| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; shell syntax and all applicable regression suites passed. |
|| `git -C cpython diff --check` | 0; nested source diff clean. |
|| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch`; `git -C cpython diff \\| cmp - compat/msvc600/cpython-3.11.16-vc6-headers.patch` | both 0; compatibility patch matches the complete nested source diff byte-for-byte. |

This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine Python execution, and no real Windows 98 SE execution. The next narrow slice is the distinct VC98 SDK/API blocker `posixmodule.c(9076)`, `SYMBOLIC_LINK_FLAG_DIRECTORY`; do not broaden into later cascading diagnostics.

## Latest revision (`posixmodule.c` `os_waitpid_impl()` C89 declaration-order slice)

Date: 2026-09-23 06:11 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before changing anything, `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` were read. The top-level checkout remains on `main` with pre-existing local changes preserved; the nested `cpython/` checkout remains detached at the baseline with its existing port edits. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains external/local-only through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified compiler banner is `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded `_blake2/blake2s_impl.c` frontier state was force-re-probed first and remained true: `_blake2/blake2s_impl.c` compiled, 39 sources compiled, and `posixmodule.c(8741)` was the first stable blocker. After the prior 64-bit spelling slice, the stable diagnostic family was C2143/C2065 for the post-statement `PY_LONG_LONG ustatus` declaration/use. One focused Codex coding-agent lane implemented this exact TDD slice, preserving local changes and avoiding commits, pushes, and publication. No independent review is claimed.

This slice changed only:

- `cpython/Modules/posixmodule.c` — moved `PY_LONG_LONG ustatus` into `os_waitpid_impl()`'s opening C89 declaration group and changed its original declaration initializer to `ustatus = (unsigned int)status;`. The conversion point, left shift, and `Py_BuildValue()` result order are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused structural assertion; it was observed RED before the source edit and GREEN afterward.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report only.

**Exact validation commands and results:**

| Command | Exit/result |
|---|---|
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all wine cmd /c 'call Z:\\\\home\\\\ubuntu\\\\Organized\\\\Legacy-Ports\\\\Projects\\\\python-win9x\\\\MSVC600\\\\VC98\\\\Bin\\\\VCVARS32.BAT && cl'` | 0; banner `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. |
| Focused waitpid assertion before source edit | 1; expected RED. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit | 2; `_blake2/blake2s_impl.c` compiled, 39 sources compiled, and `posixmodule.c` compiled past line 8741. The next first stable blocker is `posixmodule.c(8885)` C2065 for unavailable `FSCTL_GET_REPARSE_POINT`; summary `total=40 compiled=39 cached=0 skipped=0`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; all applicable regression suites and shell syntax checks passed. |
| `git -C cpython diff --check` | 0; nested source diff clean. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch`; `git -C cpython diff \| cmp - compat/msvc600/cpython-3.11.16-vc6-headers.patch` | both 0; compatibility patch matches the complete nested source diff byte-for-byte. |

This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine Python execution, and no real Windows 98 SE execution. The next narrow slice is the distinct VC98 SDK/API blocker `posixmodule.c(8885)`, `FSCTL_GET_REPARSE_POINT`; do not broaden into later cascading diagnostics.

## Latest revision (`posixmodule.c` `os_waitpid_impl()` VC6 64-bit spelling slice)

Date: 2026-09-23 04:03 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before changing anything, `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` were read. The top-level checkout remains on `main` with pre-existing local changes preserved; the nested `cpython/` checkout remains detached at the baseline with its existing port edits. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains external/local-only through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified compiler banner is `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded `_blake2/blake2s_impl.c` frontier state was force-re-probed first and remained true: `_blake2/blake2s_impl.c` compiled, 39 sources compiled, and `posixmodule.c(8741)` was the first stable blocker. The initial diagnostic family was MSVC6 C2632/C2143/C2065 for `unsigned long long ustatus` and its use. The requested focused coding-agent lane could not launch because the runtime lacks the `anthropic` package; no child changes were used. I then performed this one narrow TDD slice directly, preserving local changes. No independent review is claimed.

This slice changed only:

- `cpython/Modules/posixmodule.c` — changed `unsigned long long ustatus` to CPython's `PY_LONG_LONG` abstraction in `os_waitpid_impl()`. The `(unsigned int)status` conversion, left shift, and `Py_BuildValue()` expression are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added one focused structural assertion for the VC6-compatible status type and preserved the status shift.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report only.

**Exact validation commands and results:**

| Command | Exit/result |
|---|---|
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all wine cmd /c 'call Z:\\\\home\\\\ubuntu\\\\Organized\\\\Legacy-Ports\\\\Projects\\\\python-win9x\\\\MSVC600\\\\VC98\\\\Bin\\\\VCVARS32.BAT && cl'` | 0; banner `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | 2; `_blake2/blake2s_impl.c` compiled, 39 sources compiled, first blocker `posixmodule.c(8741)` C2632/C2143/C2065 for `unsigned long long ustatus`; summary `total=40 compiled=39 cached=0 skipped=0`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the focused assertion, before source edit | 1; expected RED: `os_waitpid_impl must use the VC6-compatible PY_LONG_LONG status type`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | 0; GREEN, `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after this slice | 2; `posixmodule.c` passed the `long long` spelling blocker. The next first stable blocker is the distinct C89 declaration-order error at `posixmodule.c(8741)` C2143/C2065 for the still post-statement `ustatus` declaration/use; summary `total=40 compiled=39 cached=0 skipped=0`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; all applicable regression suites and shell syntax checks passed. |
| `git -C cpython diff --check` | 0; nested source diff clean. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch`; `git -C cpython diff \| cmp - compat/msvc600/cpython-3.11.16-vc6-headers.patch` | both 0; compatibility patch matches the complete nested source diff byte-for-byte. |

This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine Python execution, and no real Windows 98 SE execution. The next narrow slice is the distinct C89 declaration-order defect at `posixmodule.c(8741)` for `ustatus`; do not broaden into the later `os_readlink_impl()` API/declaration diagnostics.

## Latest revision (`posixmodule.c` `os_kill_impl()` C89 declaration-order slice)

Date: 2026-09-23 01:56 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before changing anything, `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` were read. The top-level checkout remains on `main` with pre-existing local changes preserved; the nested `cpython/` checkout remains detached at the baseline with its existing port edits. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains external/local-only through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified compiler banner is `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded `_blake2/blake2s_impl.c` frontier state was force-re-probed first and remained true: `_blake2/blake2s_impl.c` compiled, 39 sources compiled, and `posixmodule.c(8177)` was the first stable blocker. MSVC6 reported C2275/C2065/C2146 for the Windows-local declarations in `os_kill_impl()`. One focused Codex coding-agent lane implemented only this TDD slice, preserving local changes and avoiding commits, pushes, and publication. No independent review is claimed.

This slice changed only:

- `cpython/Modules/posixmodule.c` — hoisted the Windows `os_kill_impl()` locals (`result`, `sig`, `err`, and `handle`) into the opening declaration group and changed `sig` initialization to an assignment at its original evaluation point. Audit, signal conversion, error handling, process termination, cleanup, and return order are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added one focused structural assertion for the C89 declarations and preserved evaluation/error/cleanup order.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report only.

**Exact validation commands and results:**

| Command | Exit/result |
|---|---|
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all wine cmd /c 'call Z:\\\\home\\\\ubuntu\\\\Organized\\\\Legacy-Ports\\\\Projects\\\\python-win9x\\\\MSVC600\\\\VC98\\\\Bin\\\\VCVARS32.BAT && cl'` | 0; banner `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. |
| Focused `os_kill_impl` assertion before source edit | 1; expected RED declaration/order assertion failure, as reported by the delegated lane. |
| Focused `os_kill_impl` assertion after source edit | 0; GREEN. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` | 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; `_blake2/blake2s_impl.c` compiled, 39 sources compiled, and `posixmodule.c` compiled past line 8177. The next first stable blocker is `posixmodule.c(8741)` C2632/C2143/C2065 for the `long long` spelling in the `os_readlink_impl()` sequence; summary `total=40 compiled=39 cached=0`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; all applicable regression suites and shell syntax checks passed. |
| `git -C cpython diff --check` | 0; nested source diff clean. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch`; `git -C cpython diff \| cmp - compat/msvc600/cpython-3.11.16-vc6-headers.patch` | both 0; compatibility patch matches the complete nested source diff byte-for-byte. |

This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine Python execution, and no real Windows 98 SE execution. The next narrow slice is the distinct VC6 64-bit spelling defect at `posixmodule.c(8741)` in the `os_readlink_impl()` sequence; do not broaden into later cascading diagnostics.

## Latest revision (`posixmodule.c` `os_spawnv_impl()` C89 `saved_errno` declaration slice)

Date: 2026-09-22 23:47 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before changing anything, `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` were read. The top-level checkout remains on `main` with pre-existing local changes preserved; the nested `cpython/` checkout remains detached at the baseline with its existing port edits. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains external/local-only through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified compiler banner is `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded `_blake2/blake2s_impl.c` frontier state was force-re-probed first and remained true: `_blake2/blake2s_impl.c` compiled, 39 sources compiled, and `posixmodule.c(6699)` was the first stable blocker. MSVC6 reported C2143 for the mixed declaration `int saved_errno = errno;`, followed by C2065 at its use. The requested focused coding-agent delegation could not launch because the runtime lacks the `anthropic` package; no child changes were used. I then performed this one narrow TDD slice directly, preserving all local changes. No independent review is claimed.

This slice changed only:

- `cpython/Modules/posixmodule.c` — hoisted `int saved_errno` into `os_spawnv_impl()`'s opening declaration group and changed the original post-thread assignment to `saved_errno = errno;`. The assignment, `free_string_array()` cleanup, errno restoration, and spawn-result error order are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added one focused structural assertion for the C89 declaration and preserved assignment/cleanup order.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report only.

**Exact validation commands and results:**

| Command | Exit/result |
|---|---|
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all wine cmd /c 'call Z:\\\\home\\\\ubuntu\\\\Organized\\\\Legacy-Ports\\\\Projects\\\\python-win9x\\\\MSVC600\\\\VC98\\\\Bin\\\\VCVARS32.BAT && cl'` | 0; banner `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | 2; `_blake2/blake2s_impl.c` compiled, 39 sources compiled, and first blocker `posixmodule.c(6699)` C2143/C2065 for `saved_errno`; summary `total=40 compiled=39 cached=0`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the focused assertion, before source edit | 1; expected RED: `os_spawnv_impl saved_errno declaration missing from opening group`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | 0; GREEN, `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after this slice | 2; `posixmodule.c` compiled past line 6699. The next first stable blocker is `posixmodule.c(8177)` C2275/C2065 for declarations after executable statements in `os_kill_impl()`; summary `total=40 compiled=39 cached=0`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh` | 0. |
| `bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; all applicable regression suites passed. |
| `git -C cpython diff --check` | 0; nested source diff clean. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch`; `cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | both 0; compatibility patch matches the complete nested source diff byte-for-byte. |

This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine Python execution, and no real Windows 98 SE execution. The next narrow slice is the distinct C89 declaration-order defect at `posixmodule.c(8177)` in `os_kill_impl()`; do not broaden into later cascading diagnostics.

## Latest revision (`posixmodule.c` `parse_envlist()` C89 key/val declaration slice)

Date: 2026-09-22 21:40 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before this run, `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` were read. The top-level checkout remains on `main` with pre-existing local changes preserved; the nested `cpython/` checkout remains detached at the baseline with its existing port edits. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains external/local-only through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified compiler banner is `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded frontier was force-re-probed first and remained applicable: `_blake2/blake2s_impl.c` compiled, 39 sources compiled, and `posixmodule.c(5840)` was the first stable blocker. MSVC6 reported C2275/C2065 for the loop-local `PyObject *val` declaration. One focused Codex coding-agent lane implemented exactly this TDD slice, preserving local changes and avoiding commits, pushes, and publication. No independent review is claimed.

This slice changed only:

- `cpython/Modules/posixmodule.c` — hoisted `PyObject *key, *val` into `parse_envlist()`'s opening declaration group and changed both loop declarations to assignments at their original `PyList_GetItem()` evaluation points. NULL checks, conversion order, cleanup, and error flow are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added one focused structural assertion for the C89 declarations and preserved `PyList_GetItem()`/evaluation/error/cleanup order.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report only.

**Exact validation commands and results:**

| Command | Exit/result |
|---|---|
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all wine cmd /c 'call Z:\\\\home\\\\ubuntu\\\\Organized\\\\Legacy-Ports\\\\Projects\\\\python-win9x\\\\MSVC600\\\\VC98\\\\Bin\\\\VCVARS32.BAT && cl'` | 0; banner `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. |
| Focused parse-envlist assertion before source edit | 1; expected RED assertion failure: `parse_envlist must hoist key and val into the C89 declaration group and preserve PyList_GetItem/evaluation/error/cleanup order`. |
| Focused parse-envlist assertion after source edit | 0; GREEN, no output. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` | 0; `ALL TESTS PASSED`, including the new parse-envlist assertion. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; `posixmodule.c` compiled past line 5840. The next first stable blocker is `posixmodule.c(6699)` C2143 for `saved_errno`; summary `total=40 compiled=39 cached=0`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; all applicable regression suites and shell syntax checks passed. |
| `git -C cpython diff --check` | 0; nested source diff clean. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch`; `cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | both 0; compatibility patch matches the complete nested source diff byte-for-byte. |

This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine Python execution, and no real Windows 98 SE execution. The next narrow slice is the distinct C89 declaration-order defect at `posixmodule.c(6699)` for `saved_errno`; do not broaden into later cascading diagnostics.

## Latest revision (`posixmodule.c` VC6 reparse-tag constants slice)

Date: 2026-09-22 19:31 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before changing anything, `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` were read. The top-level checkout remains on `main` with pre-existing local changes preserved; the nested `cpython/` checkout remains detached at the baseline with its existing port edits. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains external/local-only through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified compiler banner is `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded frontier was force-re-probed first and remained applicable: `_blake2/blake2s_impl.c` compiled, 39 sources compiled, and `posixmodule.c(5130)` was the first stable blocker. MSVC6 reported C2065 for the VC98 SDK's missing `IO_REPARSE_TAG_SYMLINK`; the paired mount-point constant was also unavailable. The requested focused coding-agent delegation could not launch because the runtime lacks the `anthropic` package; no child changes were used. I then performed this one narrow TDD slice directly, preserving all local changes.

This slice changed only:

- `cpython/Modules/posixmodule.c` — added `_MSC_VER < 1300`/`#ifndef` fallbacks for `IO_REPARSE_TAG_SYMLINK` (`0xA000000C`) and `IO_REPARSE_TAG_MOUNT_POINT` (`0xA0000003`). The existing `Py_DeleteFileW()` tag checks and modern SDK behavior are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added one focused structural assertion for the VC6-only guarded constants and preservation of both tag checks.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report only.

**Exact validation commands and results:**

| Command | Exit/result |
|---|---|
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all wine cmd /c 'call Z:\\\\home\\\\ubuntu\\\\Organized\\\\Legacy-Ports\\\\Projects\\\\python-win9x\\\\MSVC600\\\\VC98\\\\Bin\\\\VCVARS32.BAT && cl'` | 0; banner `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | 2; first stable blocker `posixmodule.c(5130)` C2065 for `IO_REPARSE_TAG_SYMLINK`; summary `total=40 compiled=39 cached=0`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit | 1; expected RED: `VC6 symlink reparse-tag fallback missing`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after this slice | 2; `posixmodule.c` compiled past line 5130. The next first stable blocker is `posixmodule.c(5840)` C2275/C2065 for the loop-local `PyObject *val`; summary `total=40 compiled=39 cached=0`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; all applicable regression suites and shell syntax checks passed. |
| `git -C cpython diff --check` | 0; nested source diff clean. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch`; `cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | both 0; compatibility patch matches the complete nested source diff byte-for-byte. |

This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine Python execution, and no real Windows 98 SE execution. The next narrow slice is the distinct C89 declaration-order defect at `posixmodule.c(5840)` in the environment-building loop; do not broaden into later cascading diagnostics.

## Latest revision (`posixmodule.c` `os__path_normpath_impl()` C89 declaration-order slice)

Date: 2026-09-22 17:23 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before changing anything, `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` were read. The top-level checkout remains on `main` with pre-existing local changes preserved; the nested `cpython/` checkout remains detached at the baseline with its existing port edits. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains external/local-only through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified compiler banner is `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded frontier was force-re-probed first and remained applicable: `_blake2/blake2s_impl.c` compiled, 39 sources compiled, and `posixmodule.c(4614)` was the first stable blocker. MSVC6 reported C2275/C2146/C2065 for the mixed declarations in `os__path_normpath_impl()`. One focused Codex coding-agent lane implemented exactly this TDD slice, preserving local changes and avoiding commits, pushes, and publication. The lane reported the required focused RED test before the source edit and GREEN afterward; no independent review is claimed.

This slice changed only:

- `cpython/Modules/posixmodule.c` — moved `len`, `buffer`, `norm_len`, `norm_path`, and `result` into the function's opening declaration group and changed initializers to assignments at their original evaluation points. Type checking, allocation, NULL handling, normalization, result creation, cleanup, and return order are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added one focused structural assertion for the C89-safe declaration group and preserved evaluation/error/cleanup order.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report only.

**Exact validation commands and results:**

| Command | Exit/result |
|---|---|
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all wine cmd /c 'call Z:\\\\home\\\\ubuntu\\\\Organized\\\\Legacy-Ports\\\\Projects\\\\python-win9x\\\\MSVC600\\\\VC98\\\\Bin\\\\VCVARS32.BAT && cl'` | 0; banner `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | 2; first blocker `posixmodule.c(4614)` C2275/C2146/C2065 for `len`, `buffer`, `norm_len`, `norm_path`, and `result`; summary `total=40 compiled=39 cached=0`. |
| Focused normpath structural assertion before source edit | 1 as reported by the delegated lane; expected RED. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after implementation | 0; `ALL TESTS PASSED`, including the normpath assertion. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after this slice | 2; `posixmodule.c` compiled past line 4614. The next first stable blocker is `posixmodule.c(5130)` C2065 for unavailable `IO_REPARSE_TAG_SYMLINK`; summary `total=40 compiled=39 cached=0`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; all applicable regression suites and shell syntax checks passed. |
| `git -C cpython diff --check` | 0; nested source diff clean. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch`; `cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | both 0; compatibility patch matches the complete nested source diff byte-for-byte. |

This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine Python execution, and no real Windows 98 SE execution. The next narrow slice is the distinct VC98 SDK/API blocker at `posixmodule.c(5130)`, `IO_REPARSE_TAG_SYMLINK`; do not broaden into later cascading diagnostics.

## Latest revision (`posixmodule.c` `os__path_splitroot_impl()` C89 loop-counter slice)

Date: 2026-09-22 15:14 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before this slice, `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` were read. The top-level checkout remains on `main` with pre-existing local changes preserved; the nested `cpython/` checkout remains detached at the baseline with its existing port edits. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains external/local-only through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified compiler banner is `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded frontier was force-re-probed first and remained applicable: `_blake2/blake2s_impl.c` compiled, 39 sources compiled, and `posixmodule.c(4569)` was the first stable blocker. MSVC6 reported C2143/C2065 for the C99 `for (wchar_t *p = ...)` declaration in `os__path_splitroot_impl()`. One focused Codex coding-agent lane implemented exactly this TDD slice, preserving local changes and avoiding commits, pushes, and publication. No independent review is claimed.

This slice changed only:

- `cpython/Modules/posixmodule.c` — hoisted `wchar_t *p` into `os__path_splitroot_impl()`'s opening declaration group and changed the loop initializer to `p = wcschr(...)`; slash replacement and loop evaluation order are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added one focused structural assertion for the C89-safe declaration and preserved copy/search/replace order. The delegated lane observed the required RED failure (exit 1) before the source edit and GREEN (exit 0) afterward.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report only.

**Exact validation commands and results:**

| Command | Exit/result |
|---|---|
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all wine cmd /c 'call Z:\\\\home\\\\ubuntu\\\\Organized\\\\Legacy-Ports\\\\Projects\\\\python-win9x\\\\MSVC600\\\\VC98\\\\Bin\\\\VCVARS32.BAT && cl'` | 0; banner `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | 2; first blocker `posixmodule.c(4569)` C2143/C2065 for the post-statement `wchar_t *p`; summary `total=40 compiled=39 cached=0`. |
| Focused split-root structural assertion before source edit | 1; expected RED assertion failure. |
| Focused split-root structural assertion after source edit | 0; expected GREEN result. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` | 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after this slice | 2; `posixmodule.c` compiled past line 4569. The next first stable blocker is `posixmodule.c(4614)` C2275/C2146/C2065 for mixed declarations in `os__path_normpath_impl()` (`Py_ssize_t len`, `wchar_t *buffer`, and subsequent locals); summary `total=40 compiled=39 cached=0`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; all applicable regression suites and shell syntax checks passed. |
| `git -C cpython diff --check` | 0; nested source diff clean. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch`; `cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | both 0; compatibility patch matches the complete nested source diff byte-for-byte. |

This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine Python execution, and no real Windows 98 SE execution. The next narrow slice is the distinct C89 declaration-order defect at `posixmodule.c(4614)` in `os__path_normpath_impl()`; do not broaden into later API or cascading diagnostics.

## Latest revision (`posixmodule.c` `os__getfinalpathname_impl()` C89 `tmp` declaration slice)

Date: 2026-09-22 13:07 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before changing anything, `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` were read. The top-level checkout remains on `main` with pre-existing local changes preserved; the nested `cpython/` checkout remains detached at the baseline with its existing port edits. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains external/local-only through Wine using `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified compiler banner is `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The current frontier was force-re-probed first and remained applicable: `_blake2/blake2s_impl.c` compiled, 39 sources compiled, and `posixmodule.c(4473)` was the first stable blocker, MSVC6 C2143/C2065 for the post-statement `wchar_t *tmp` declaration. One focused Codex coding-agent lane implemented exactly this TDD slice, preserving local changes and avoiding commits, pushes, and publication. No independent review is claimed.

This slice changed only:

- `cpython/Modules/posixmodule.c` — hoisted `wchar_t *tmp` into `os__getfinalpathname_impl()`'s opening declaration group; the existing `PyMem_Realloc`, NULL-error, buffer-size, and target-path assignment sequence is unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added one focused structural assertion for the C89-safe declaration and preserved realloc/error/assignment order. The delegated lane reported the required RED failure before the source edit and GREEN afterward.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report only.

**Exact validation commands and results:**

| Command | Exit/result |
|---|---|
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all wine cmd /c 'call Z:\\\\home\\\\ubuntu\\\\Organized\\\\Legacy-Ports\\\\Projects\\\\python-win9x\\\\MSVC600\\\\VC98\\\\Bin\\\\VCVARS32.BAT && cl'` | 0; banner `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. |
| Forced frontier probe before this slice | 2; first stable blocker `posixmodule.c(4473)` C2143/C2065 for `wchar_t *tmp`; `_blake2/blake2s_impl.c` compiled; summary `total=40 compiled=39 cached=0`. |
| Focused `tmp` assertion before source edit | 1; expected RED assertion failure. |
| Focused `tmp` assertion after source edit | 0; expected GREEN result. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` | 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after this slice | 2; `posixmodule.c` compiled past line 4473. The next first stable blocker is `posixmodule.c(4569)` C2143/C2065/C2143 for the C99 `for (wchar_t *p = ...)` declaration; summary `total=40 compiled=39 cached=0`. |
| `bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/generate-getpath-frozen.test.sh` | 0; all applicable regression suites reported `ALL TESTS PASSED`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh` | 0. |
| `git -C cpython diff --check` | 0; nested source diff clean. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch`; `cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | both 0; compatibility patch matches the complete nested source diff byte-for-byte. |

This is compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine Python execution, and no real Windows 98 SE execution. The next narrow slice is the distinct C89/C99 loop-declaration defect at `posixmodule.c(4569)`; do not broaden into later cascading diagnostics.

## Latest revision (`posixmodule.c` `os__getfullpathname_impl()` C89 declaration-order slice)

Date: 2026-09-22 08:46 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before changing anything, `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` were read. The top-level checkout remains on `main` with its pre-existing local changes preserved; the nested `cpython/` checkout remains detached at the baseline with its existing port edits. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains external/local-only through Wine using `WINEPREFIX=/home/ubuntu/.wine-win9xport`.

The current frontier was force-re-probed first and remained applicable: `_blake2/blake2s_impl.c` compiled, 39 sources compiled, and `posixmodule.c(4402)` was the first stable blocker, MSVC6 C2275/C2065 for the post-statement `PyObject *str` declaration in `os__getfullpathname_impl()`. One focused Codex coding-agent lane implemented exactly this TDD slice, preserving local changes and avoiding commits, pushes, and publication. No independent review is claimed.

This slice changed only:

- `cpython/Modules/posixmodule.c` — hoisted `PyObject *str` into `os__getfullpathname_impl()`'s opening declaration group and changed its initializer to an assignment at the original `PyUnicode_FromWideChar()` point. Freeing, error handling, `Py_SETREF`, and return behavior are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added one focused structural assertion for the C89-safe declaration and preserved conversion/free/error/reference order. The delegated lane reported the required RED failure before the source edit; the assertion passed afterward.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report only.

**Exact validation commands and results:**

| Command | Exit/result |
|---|---|
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all wine cmd /c 'call Z:\\\\home\\\\ubuntu\\\\Organized\\\\Legacy-Ports\\\\Projects\\\\python-win9x\\\\MSVC600\\\\VC98\\\\Bin\\\\VCVARS32.BAT && cl'` | 0; `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | 2; first stable blocker `posixmodule.c(4402)` C2275/C2065 for `PyObject *str`; summary `total=40 compiled=39 cached=0`. `_blake2/blake2s_impl.c` compiled. |
| Focused `os__getfullpathname_impl()` assertion before source edit | 1 as reported by the delegated lane; expected RED. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after implementation | 0; `ALL TESTS PASSED`, including the new `os__getfullpathname_impl` assertion. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after this slice | 2; `posixmodule.c` compiled past line 4402. The next first stable blocker is `posixmodule.c(4455)` C2065 for unavailable `VOLUME_NAME_DOS`; summary `total=40 compiled=39 cached=0`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; all applicable regression suites and shell syntax checks passed. |
| `git -C cpython diff --check` | 0; nested source diff clean. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch`; `cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | both 0; compatibility patch matches the complete nested source diff byte-for-byte. |

This is compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine Python execution, and no real Windows 98 SE execution. The next narrow slice is the distinct VC98 SDK/API blocker at `posixmodule.c(4455)`, `VOLUME_NAME_DOS`; do not broaden into later cascading diagnostics.

## Latest revision (`posix_getcwd()` `resobj` C89 declaration-order slice)

Date: 2026-09-22 06:39 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before changing anything, `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` were read. The top-level checkout remains on `main` with its pre-existing local changes preserved; the nested `cpython/` checkout remains detached at the baseline with its existing port edits. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains external/local-only through Wine using `WINEPREFIX=/home/ubuntu/.wine-win9xport`.

The recorded frontier was force-re-probed first and remained applicable: `_blake2/blake2s_impl.c` compiled, 39 sources compiled, and `posixmodule.c(3874)` was the first stable blocker, MSVC6 C2275/C2065 for the post-statement `PyObject *resobj` declaration in `posix_getcwd()`. The requested focused coding-agent delegation failed before launch because the runtime lacks the `anthropic` package; no child changes were used. I then performed this one narrow TDD slice directly, preserving local changes. No independent review is claimed.

This slice changed only:

- `cpython/Modules/posixmodule.c` — hoisted `PyObject *resobj` into `posix_getcwd()`'s opening declaration group and changed its initializer to an assignment at the original `PyUnicode_FromWideChar()` point. Freeing, `use_bytes` conversion, and return behavior are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added one focused structural assertion for the C89-safe declaration and original result/free sequence. It failed before the source edit and passed afterward.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report only.

**Exact validation commands and results:**

| Command | Exit/result |
|---|---|
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all wine cmd /c 'call Z:\\\\home\\\\ubuntu\\\\Organized\\\\Legacy-Ports\\\\Projects\\\\python-win9x\\\\MSVC600\\\\VC98\\\\Bin\\\\VCVARS32.BAT && cl'` | 0; `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | 2; first stable blocker `posixmodule.c(3874)` C2275/C2065 for `PyObject *resobj`; summary `total=40 compiled=39 cached=0`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the focused assertion, before the source edit | 1; expected RED: `posix_getcwd resobj declaration missing from opening group`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after the source edit | 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after this slice | 2; `posix_getcwd()` compiled past the `resobj` blocker. The next first stable blocker is `posixmodule.c(4402)` C2275/C2065 for a later post-statement `PyObject *str`; summary `total=40 compiled=39 cached=0`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; all applicable regression suites and shell syntax checks passed. |
| `git -C cpython diff --check` | 0; nested source diff clean. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch`; `cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | both 0; compatibility patch matches the complete nested source diff byte-for-byte. |

This is compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine Python execution, and no real Windows 98 SE execution. The next narrow slice is the distinct C89 declaration-order defect at `posixmodule.c(4402)` for `PyObject *str`; do not broaden into later API or cascading diagnostics.

## Latest revision (`posixmodule.c` `_pystat_fromstructstat()` nanosecond declaration-order slice)

Date: 2026-09-22 04:31 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before changing anything, `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` were read. The top-level checkout remains on `main` with its pre-existing local changes preserved; the nested `cpython/` checkout remains detached at the baseline with its existing port edits. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains external/local-only through Wine using `WINEPREFIX=/home/ubuntu/.wine-win9xport`.

The recorded frontier was force-re-probed first and remained applicable: `_blake2/blake2s_impl.c` compiled, 39 sources compiled, and `posixmodule.c(2493)` was the first stable blocker, an MSVC6 C2143 declaration-order error for `unsigned long ansec, mnsec, cnsec`. One focused Codex coding-agent lane implemented exactly this TDD slice, preserving local changes and avoiding commits, pushes, and publication. No independent review is claimed.

This slice changed only:

- `cpython/Modules/posixmodule.c` — hoisted `unsigned long ansec, mnsec, cnsec` into `_pystat_fromstructstat()`'s opening declaration group and removed the later declaration. The feature-condition assignments and evaluation order are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added one focused structural assertion for the opening declaration group and original nanosecond assignment/branch sequence. The delegated lane reported the required RED failure before the source edit and GREEN afterward.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report only.

**Exact validation commands and results:**

| Command | Exit/result |
|---|---|
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all wine cmd /c 'call Z:\\\\home\\\\ubuntu\\\\Organized\\\\Legacy-Ports\\\\Projects\\\\python-win9x\\\\MSVC600\\\\VC98\\\\Bin\\\\VCVARS32.BAT && cl'` | 0; `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | 2; first stable blocker `posixmodule.c(2493)` C2143 for the post-statement nanosecond declaration; summary `total=40 compiled=39 cached=0`. |
| Focused nanosecond assertion before source edit | 1; expected RED assertion failure, as reported by the delegated lane. |
| Focused nanosecond assertion after source edit | 0; expected GREEN result. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` | 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after this slice | 2; `posixmodule.c` compiled past line 2493. The next first stable blocker is `posixmodule.c(3874)` C2275/C2065 for a later mixed declaration (`PyObject *resobj`); summary `total=40 compiled=39 cached=0`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh` | 0; all applicable regression suites and shell syntax checks passed. |
| `git -C cpython diff --check` | 0; nested source diff clean. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch`; `cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | both 0; compatibility patch matches the complete nested source diff byte-for-byte. |

This is compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine Python execution, and no real Windows 98 SE execution. The next narrow slice is the distinct later C89 declaration-order defect at `posixmodule.c(3874)`; do not broaden into subsequent API or cascading diagnostics.

## Latest revision (`posixmodule.c` `_pystat_fromstructstat()` VC6 64-bit spelling slice)

Date: 2026-09-22 02:25 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before changing anything, `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` were read. The top-level checkout remains on `main` with pre-existing local changes preserved; the nested `cpython/` checkout remains detached at the baseline with its existing port edits. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains external/local-only through Wine using `WINEPREFIX=/home/ubuntu/.wine-win9xport`.

The recorded frontier was force-re-probed first and remained applicable: `_blake2/blake2s_impl.c` compiled, 39 sources compiled, and `posixmodule.c(2472)`/`(2488)` were the first stable blockers, both MSVC6 `C2632` errors for `long long` spellings in `_pystat_fromstructstat()`. The requested coding-agent delegation was attempted but failed before launch because the runtime lacks the `anthropic` package; no child changes were used. I then performed this one narrow TDD slice directly, preserving all local changes. No independent review is claimed.

This slice changed only:

- `cpython/Modules/posixmodule.c` — changed the two `_pystat_fromstructstat()` `static_assert` type spellings from `unsigned long long`/`long long` to `unsigned PY_LONG_LONG`/`PY_LONG_LONG`, preserving assertions and runtime behavior.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added one focused structural assertion for the VC6-compatible stat-size spelling. It failed before the source edit and passed afterward.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report only.

**Exact validation commands and results:**

||| Command | Exit/result |
|||---|---|
||| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all wine cmd /c 'call Z:\\\\home\\\\ubuntu\\\\Organized\\\\Legacy-Ports\\\\Projects\\\\python-win9x\\\\MSVC600\\\\VC98\\\\Bin\\\\VCVARS32.BAT && cl'` | 0; `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. |
||| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | 2; first stable blockers `posixmodule.c(2472)` and `(2488)`, C2632 `long` followed by `long`; summary `total=40 compiled=39 cached=0`. |
||| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` before source edit | 1; expected RED: `VC6 stat-size assertion must use PY_LONG_LONG`, followed by the focused assertion failure. |
||| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | 0; `ALL TESTS PASSED`. |
||| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after this slice | 2; `posixmodule.c` compiled past both `long long` spelling blockers; next first stable blocker is `posixmodule.c(2493)` C2143, the post-statement `unsigned long ansec, mnsec, cnsec` declaration. Summary `total=40 compiled=39 cached=0`. |
||| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; all applicable regression suites and shell syntax checks passed. |
||| `git -C cpython diff --check` | 0; nested source diff clean. |
||| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch`; `cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | both 0; compatibility patch matches the complete nested source diff byte-for-byte. |

This is compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine Python execution, and no real Windows 98 SE execution. The next narrow slice is the distinct C89 declaration-order defect at `posixmodule.c(2493)` in `_pystat_fromstructstat()`; do not broaden into later API or cascading diagnostics.

## Latest revision (`posixmodule.c` `_pystat_fromstructstat()` C89 declaration-order slice)

Date: 2026-09-22 00:18 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before changing anything, `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` were read. The top-level checkout remains on `main` with pre-existing local changes preserved; the nested `cpython/` checkout remains detached at the baseline with its existing port edits. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains external/local-only through Wine using `WINEPREFIX=/home/ubuntu/.wine-win9xport`.

The recorded frontier was force-re-probed first and remained applicable: `_blake2/blake2s_impl.c` compiled, 39 sources compiled, and `posixmodule.c(2453)` was the first stable blocker, the C89 declaration-order family in `_pystat_fromstructstat()`. The requested coding-agent delegation was attempted but failed before launch because the runtime lacks the `anthropic` package; no child changes were used. I then performed this one narrow TDD slice directly, preserving all local changes. No independent review is claimed.

This slice changed only:

- `cpython/Modules/posixmodule.c` — hoisted `PyObject *StatResultType` and `PyObject *v` before the initial assertion and changed their initializers to assignments at the original evaluation point. Evaluation order and behavior are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added one focused structural assertion for the C89-safe declaration group and preserved assignment sequence. The assertion failed before the source edit and passed afterward.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report only.

**Exact validation commands and results:**

|| Command | Exit/result |
||---|---|
|| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all wine cmd /c 'call Z:\\\\home\\\\ubuntu\\\\Organized\\\\Legacy-Ports\\\\Projects\\\\python-win9x\\\\MSVC600\\\\VC98\\\\Bin\\\\VCVARS32.BAT && cl'` | 0; `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. |
|| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | 2; `posixmodule.c(2453)` first stable blocker, C2143/C2275/C2065 for post-statement `StatResultType`/`v`; summary `total=40 compiled=39 cached=0`. |
|| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit | 1; expected RED: `_pystat_fromstructstat declaration missing from opening group`. |
|| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | 0; `ALL TESTS PASSED`. |
|| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after this slice | 2; `posixmodule.c` compiled past line 2453; next first stable blocker is `posixmodule.c(2472)` C2632, `long long` spelling; summary `total=40 compiled=39 cached=0`. |
|| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; all applicable regression suites and shell syntax checks passed. |
|| `git -C cpython diff --check` | 0; nested source diff clean. |
|| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch`; `cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | both 0; compatibility patch matches the complete nested source diff byte-for-byte. |

This is compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine Python execution, and no real Windows 98 SE execution. The next narrow slice is the distinct `posixmodule.c(2472)` `long long` defect family; do not broaden into later declaration, API, or cascading diagnostics.

## Latest revision (`posixmodule.c` `fill_time()` C89 declaration-order slice)

Date: 2026-09-21 22:10 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before changing anything, `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` were read. The top-level checkout remains on `main` with pre-existing local changes preserved; the nested `cpython/` checkout remains detached with its existing port edits. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains external/local-only through Wine using `WINEPREFIX=/home/ubuntu/.wine-win9xport`.

The recorded frontier was force-re-probed first and remained applicable: `_blake2/blake2s_impl.c` compiled, 39 sources compiled, and `posixmodule.c(2400)` was the first stable blocker, the C89 declaration-order family in `fill_time()`. One focused Codex coding-agent lane implemented only this slice, preserving local changes and avoiding commits, pushes, and publication. No independent review is claimed; the resulting diff and all gates below were independently checked.

This slice changed only:

- `cpython/Modules/posixmodule.c` — hoisted `res`, `s_in_ns`, `ns_total`, `float_s`, `s`, and `ns_fractional` before the initial assertion; changed only the two object-creation declarations into assignments at their original evaluation point. Cleanup and evaluation order are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added one focused structural assertion for the opening declaration group, absence of mixed declarations, and preserved assignment/cleanup sequence. The delegated lane reported the required RED test before the source edit and GREEN afterward.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report only.

**Exact validation commands and results:**

| Command | Exit/result |
|---|---|
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all wine cmd /c 'call Z:\\\\home\\\\ubuntu\\\\Organized\\\\Legacy-Ports\\\\Projects\\\\python-win9x\\\\MSVC600\\\\VC98\\\\Bin\\\\VCVARS32.BAT && cl'` | 0; `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | 2; `_blake2/blake2s_impl.c` compiled and `posixmodule.c(2400)` was first; C2143/C2275/C2065 followed for `res`, `s_in_ns`, `ns_total`, and `float_s`; summary `total=40 compiled=39 cached=0 skipped=0`. |
| focused `fill_time()` assertion before source edit | 1 as reported by the coding lane; expected RED declaration/order failure. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after implementation | 0; `ALL TESTS PASSED`, including the new `fill_time()` assertion. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after this slice | 2; `posixmodule.c` compiled past `fill_time()`; next first stable blocker `posixmodule.c(2453)` is `_pystat_fromstructstat()`'s post-statement `PyObject *StatResultType` declaration (C2143/C2275/C2065). Summary `total=40 compiled=39 cached=0 skipped=0`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; all applicable regression suites passed. |
| `git -C cpython diff --check` | 0; nested source diff clean. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch`; `cmp -s /tmp/win9x-fill-time-diff.patch compat/msvc600/cpython-3.11.16-vc6-headers.patch` | both 0; compatibility patch matches the complete nested source diff byte-for-byte. |

This is compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine Python execution, and no real Windows 98 SE execution. The next narrow slice is the distinct C89 declaration-order defect at `posixmodule.c(2453)` in `_pystat_fromstructstat()`; do not broaden into the later `long long`, API, or cascading diagnostics.

## Latest revision (`posixmodule.c` VC6 `fileAttributes` declaration/sentinel slice)

Date: 2026-09-21 19:59 UTC

Read `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before edits. Implemented exactly the recorded line-1996/1998 defect family in the existing checkout. All pre-existing local changes and the history below are preserved; nothing was reset, cleaned, stashed, discarded, committed, pushed, or published.

Files changed in this slice:

- `cpython/Modules/posixmodule.c`: moved `DWORD fileAttributes` to the opening of its existing non-disk block, retaining the query after the unknown-file-type error check. Added an MS_WINDOWS/VC6-only, `#ifndef`-protected `INVALID_FILE_ATTRIBUTES` definition of `((DWORD)-1)`. Modern SDK definitions and query/cleanup behavior are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh`: one focused assertion covering the declaration, original query order, and guarded sentinel fallback; observed RED before editing source and GREEN afterward.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch`: regenerated exactly from the complete nested diff, including all earlier local port changes.
- `PORT_STATUS.md`: prepended this entry only.

Exact validation commands and exit codes (log paths are local `/tmp` artifacts):

| Command | Exit/result |
|---|---|
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh > /tmp/win9x-fileattributes-red.log 2>&1` | 1; expected RED: only the new assertion failed, reporting `fileAttributes needs a C89 declaration, original-point query, and VC6-only SDK sentinel fallback`. Source had not yet been edited. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh > /tmp/win9x-fileattributes-green.log 2>&1` | 0; GREEN, `ALL TESTS PASSED`. This sandbox run is structural evidence; functioning Wine validation was repeated below. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch` | 0. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > /tmp/win9x-fileattributes-frontier.log 2>&1` (sandbox attempt) | 1; Wine could not create `/run/user/1000/wine/server-801-136fb0/lock` on the read-only filesystem; no compiler-frontier conclusion from this attempt. |
| Same forced-frontier command, retried with escalated Wine runtime access | 2; `total=40 compiled=39 cached=0 skipped=0`. First compiler error: `posixmodule.c(2400)` C2143, missing `;` before `type`, at `fill_time()`'s post-statement `int res = -1;`. No `fileAttributes` or `INVALID_FILE_ATTRIBUTES` diagnostics remain. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh > /tmp/win9x-fileattributes-green-live.log 2>&1` (with Wine runtime access) | 0; `ALL TESTS PASSED`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh > /tmp/win9x-fileattributes-stdint.log 2>&1` (with Wine runtime access) | 0; shell syntax and all five applicable regression suites passed. |
| `git -C cpython diff --check` | 0. |
| `git -C cpython diff | cmp - compat/msvc600/cpython-3.11.16-vc6-headers.patch` | 0; byte-for-byte match. |
| `git diff --check > /tmp/win9x-fileattributes-diff-check.log` | 2; inherited whitespace-only context lines in the generated patch. Kept the required exact nested diff. |

Snapshot/hash comparison confirms only `Modules/posixmodule.c` changed among the pre-existing modified nested source files. The next blocker is the distinct C89 declaration-order family in `fill_time()` beginning at line 2400; it was not changed. These are compile-probe results only: no linked `pythoncore`/`python.exe`, Wine Python execution, or Windows 98 runtime result is claimed.

## Latest revision (`posixmodule.c` VC6 `FILE_ATTRIBUTE_TAG_INFO` API-gate slice)

Date: 2026-09-21 17:49 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before changing anything, `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` were read. The nested `cpython/` checkout remains detached with all pre-existing local port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains external/local-only through Wine using `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified banner is `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded frontier was force-re-probed first and remained applicable: `_blake2/blake2s_impl.c` compiled, 39 sources compiled, and `posixmodule.c(1907)` was the first stable blocker because the VC98 SDK lacks `FILE_ATTRIBUTE_TAG_INFO`. One focused Codex coding-agent lane implemented only this TDD slice in the existing checkout, preserving local changes and avoiding commits, pushes, and publication. No independent review is claimed.

This slice changed only:

- `cpython/Modules/posixmodule.c` — added a VC6-local two-field tag-info shape and compiled out the unavailable `GetFileInformationByHandleEx`/`FileAttributeTagInfo` query block for `_MSC_VER < 1300`; the modern path is unchanged and existing `tagInfo` consumers remain valid.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added one focused structural assertion for the VC6 fallback and modern-path preservation.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all wine cmd /c 'call Z:\\\\home\\\\ubuntu\\\\Organized\\\\Legacy-Ports\\\\Projects\\\\python-win9x\\\\MSVC600\\\\VC98\\\\Bin\\\\VCVARS32.BAT && cl'` | exit 0; banner `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; first blocker `posixmodule.c(1907)` C2065/C2146/C2059 for `FILE_ATTRIBUTE_TAG_INFO`; summary `total=40 compiled=39 cached=0`. |
| focused TDD assertion before source edit | exit 1 as required by TDD. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after implementation | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after this slice | exit 2; `posixmodule.c` compiled past the tag-info API family. The next first stable blocker is `posixmodule.c(1996)` C2275/C2146/C2065 for the post-statement `DWORD fileAttributes`; summary `total=40 compiled=39 cached=0`. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch`; `git -C cpython diff \| cmp - compat/msvc600/cpython-3.11.16-vc6-headers.patch` | both exit 0; patch matches the complete nested source diff byte-for-byte. |
| `git -C cpython diff --check` | exit 0; nested source diff is clean. |
| top-level `git diff --check` | exit 2 only for inherited blank context lines in the generated compatibility patch; patch remains byte-for-byte reproducible. |

**Current compile-frontier state:** `win32_xstat_impl()` now compiles past the VC98 `FILE_ATTRIBUTE_TAG_INFO`/`GetFileInformationByHandleEx` blocker under MSVC6 through Wine. The next narrow frontier is the distinct C89 declaration-order defect at `posixmodule.c(1996)`. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`posixmodule.c` `win32_wchdir()` C89 declaration-order slice)

Date: 2026-09-21 15:42 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before changing anything, `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` were read. The nested `cpython/` checkout remains detached with all pre-existing local port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains external/local-only through Wine using `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified banner is `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded frontier was force-re-probed first and remained applicable: `_blake2/blake2s_impl.c` compiled, 39 sources compiled, and `posixmodule.c(1826)` was the first stable blocker, a C89 declaration-order error for `int is_unc_like_path`. One focused Codex coding-agent lane implemented only this TDD slice in the existing checkout, preserving local changes and avoiding commits, pushes, and publication. No independent review is claimed.

This slice changed only:

- `cpython/Modules/posixmodule.c` — moved `is_unc_like_path` into `win32_wchdir()`'s opening declaration group and assigned it at the original post-`GetCurrentDirectoryW()` point. Evaluation order and behavior are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added one focused structural assertion for the declaration and assignment order.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all wine cmd /c 'call Z:\\\\home\\\\ubuntu\\\\Organized\\\\Legacy-Ports\\\\Projects\\\\python-win9x\\\\MSVC600\\\\VC98\\\\Bin\\\\VCVARS32.BAT && cl'` | exit 0; banner `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; `_blake2/blake2s_impl.c` compiled; first blocker `posixmodule.c(1826)` C2143/C2065 for the post-statement `is_unc_like_path` declaration; summary `total=40 compiled=39 cached=0`. |
| delegated `codex exec -s workspace-write --skip-git-repo-check ...` | exit 0; added the focused assertion, reported the required RED test, applied only `win32_wchdir()`, and regenerated the compatibility patch; no commit/push/publication. |
| focused TDD assertion before source edit | exit 1 as required by TDD. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after implementation | exit 0; `ALL TESTS PASSED`. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch`; `cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; patch matches the complete nested source diff byte-for-byte. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after this slice | exit 2; `posixmodule.c` compiled past line 1826. The next first stable blocker is `FILE_ATTRIBUTE_TAG_INFO` at `posixmodule.c(1907)` (undeclared in the VC98 SDK), followed by cascading legacy API and C89 diagnostics; summary `total=40 compiled=39 cached=0`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | exit 0; all applicable regression suites and shell syntax checks passed. |
| `git -C cpython diff --check` | exit 0; nested source diff is clean. |

**Current compile-frontier state:** `win32_wchdir()` now compiles through its C89 declaration-order family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is the distinct VC98 SDK/API blocker `FILE_ATTRIBUTE_TAG_INFO` at `posixmodule.c(1907)`. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`posixmodule.c` VC6 reparse-query API slice)

Date: 2026-09-21 13:33 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before changing anything, `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` were read. The nested `cpython/` checkout remains detached with all pre-existing local port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains external/local-only through Wine using `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified banner is `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded frontier was force-re-probed first and remained applicable: 39 sources compiled and `posixmodule.c` was first. The first stable blocker was the VC98 SDK's undeclared `FSCTL_GET_REPARSE_POINT` at `posixmodule.c(1582)`. One focused Codex coding lane implemented only this TDD slice in the existing checkout, preserving local changes and avoiding commits, pushes, and publication. No independent review is claimed.

This slice changed only:

- `cpython/Modules/posixmodule.c` — for `_MSC_VER < 1300`, `win32_get_reparse_tag()` now returns `FALSE` without referencing the unavailable reparse query operation; the modern helper body is unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added one focused structural assertion for the VC6 fallback and preserved modern body.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all wine cmd /c 'call Z:\\\\home\\\\ubuntu\\\\Organized\\\\Legacy-Ports\\\\Projects\\\\python-win9x\\\\MSVC600\\\\VC98\\\\Bin\\\\VCVARS32.BAT && cl'` | exit 0; banner `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 39 sources compiled; first stable blocker `posixmodule.c(1582)` C2065, undeclared `FSCTL_GET_REPARSE_POINT`; later C89 declaration and legacy API diagnostics followed; summary `total=40 compiled=39 cached=0 skipped=0`. |
| focused delegated RED assertion | exit 1 as reported by the coding lane; expected assertion that the VC6 path must return `FALSE` without the unavailable operation. |
| focused delegated GREEN assertion | exit 0 as reported by the coding lane: `ok - VC6 reparse query returns FALSE and preserves the modern body`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` | exit 0; `ALL TESTS PASSED`, including `VC6 reparse query returns FALSE and preserves the modern body` and `posix reparse query excludes the unavailable operation on VC6`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after this slice | exit 2; `posixmodule.c` compiled past `FSCTL_GET_REPARSE_POINT`. The next first stable blocker is `posixmodule.c(1826)` C2143, a later C89 declaration-order defect; legacy API blockers including `FILE_ATTRIBUTE_TAG_INFO` remain. Summary `total=40 compiled=39 cached=0 skipped=0`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | exit 0; all applicable regression suites and shell syntax checks passed. |
| `git -C cpython diff --check`; `cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; the nested source diff is clean and the compatibility patch matches the complete nested source diff byte-for-byte. Top-level `git diff --check` still reports inherited whitespace-only lines in the generated compatibility patch. |

**Current compile-frontier state:** `win32_get_reparse_tag()` now compiles past the VC6/VC98 missing-operation blocker under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is the distinct C89 declaration-order family at `posixmodule.c(1826)`. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`posixmodule.c` `Py_off_t` VC6 64-bit spelling slice)

Date: 2026-09-21 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before changing anything, `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` were read. The nested `cpython/` checkout remains detached with all pre-existing local port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains external/local-only through Wine using `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified banner is `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded frontier was force-re-probed first and remained applicable: `_blake2/blake2s_impl.c` compiled, 39 sources compiled, and `posixmodule.c(1482)` was the first stable blocker, `C2632` because MSVC6 rejects `typedef long long Py_off_t`. One focused Codex coding lane implemented only this TDD slice in the existing checkout, preserving local changes and avoiding commits, pushes, and publication. The lane reported the required focused RED assertion before the source edit and GREEN afterward; no independent review is claimed.

This slice changed only:

- `cpython/Modules/posixmodule.c` — changed the Windows `Py_off_t` typedef from `long long` to CPython's `PY_LONG_LONG` alias. Non-Windows behavior is unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added a focused structural assertion for the VC6-compatible Windows `Py_off_t` spelling.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all wine cmd /c 'call Z:\\\\home\\\\ubuntu\\\\Organized\\\\Legacy-Ports\\\\Projects\\\\python-win9x\\\\MSVC600\\\\VC98\\\\Bin\\\\VCVARS32.BAT && cl'` | exit 0; banner `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 39 sources compiled; first blocker `posixmodule.c(1482)` C2632 for `long long`; later declarations/APIs also failed; summary `total=40 compiled=39 cached=0`. |
| delegated focused TDD assertion before source edit | exit 1 as reported by the coding lane; expected failure `Windows Py_off_t must use PY_LONG_LONG`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after implementation | exit 0; `ALL TESTS PASSED`, including `Windows Py_off_t uses PY_LONG_LONG`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after implementation | exit 2; `posixmodule.c` compiled past the `long long` spelling blocker. The next first stable blocker is `posixmodule.c(1582)` undeclared `FSCTL_GET_REPARSE_POINT`; later C89 declaration/API errors remain. Summary `total=40 compiled=39 cached=0`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | exit 0; all applicable regression suites and shell syntax checks passed. |
| `git -C cpython diff --check`; `cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; nested source diff is clean and the compatibility patch matches the complete nested source diff byte-for-byte. |

**Current compile-frontier state:** `posixmodule.c` now compiles through the VC6 `Py_off_t` 64-bit spelling family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is the distinct legacy-SDK/API blocker at `posixmodule.c(1582)`, `FSCTL_GET_REPARSE_POINT`. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`posixmodule.c` VC6/Win9x SDDL header/API slice)

Date: 2026-09-21 09:13 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before changing anything, `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` were read. The nested `cpython/` checkout remains detached with all pre-existing local port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains external/local-only through Wine using `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified banner is `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded frontier was force-re-probed first and remained applicable through `_blake2/blake2s_impl.c`, `_operator.c`, and the prior 39 compiled sources. The first stable blocker was `posixmodule.c(39)`, fatal C1083 because the VC98 SDK has no `sddl.h`. One focused Codex coding lane implemented only this TDD slice in the existing checkout, preserving local changes and avoiding commits, pushes, and publication. The lane reported the required focused RED assertion before the source edit and GREEN afterward; no independent review is claimed.

This slice changed only:

- `cpython/Modules/posixmodule.c` — excluded the NT-only `<sddl.h>` include, security-descriptor allocation, SDDL conversion, and `LocalFree` cleanup for `_MSC_VER < 1300`; the VC6 path retains `CreateDirectoryW(path->wide, NULL)`. Modern MSVC behavior is unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added a focused structural assertion for the VC6 SDDL exclusion and null-security-attribute fallback.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all wine cmd /c 'call Z:\\\\home\\\\ubuntu\\\\Organized\\\\Legacy-Ports\\\\Projects\\\\python-win9x\\\\MSVC600\\\\VC98\\\\Bin\\\\VCVARS32.BAT && cl'` | exit 0; banner `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; `_blake2/blake2s_impl.c` compiled, 39 sources compiled; first blocker `posixmodule.c(39)`, fatal C1083 for missing `sddl.h`; summary `total=40 compiled=39 cached=0 skipped=0`. |
| focused delegated TDD assertion before source edit | exit 1 as reported by the coding lane; expected assertion failure for missing VC6 SDDL exclusion/fallback. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after implementation | exit 0; `ALL TESTS PASSED`, including `posix mkdir excludes SDDL on VC6 and uses null security attributes`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after implementation | exit 2; `posixmodule.c` compiled past the missing `sddl.h` blocker. The next first stable blocker is `posixmodule.c(1482)` C2632 (`long long`), followed by missing legacy declarations/APIs including `FSCTL_GET_REPARSE_POINT` and `FILE_ATTRIBUTE_TAG_INFO`; summary `total=40 compiled=39 cached=0 skipped=0`. Existing warnings include `arraymodule.c(2247)` C4761, `audioop.c(1536)`/`(1609)` C4761, `faulthandler.c(542)` C4047, and `mathmodule.c(1336)` C4113/C4133. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | exit 0; all applicable regression suites and shell syntax checks passed. |
| `git -C cpython diff --check`; `cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; nested source diff is clean and the compatibility patch matches the complete nested source diff byte-for-byte. |

**Current compile-frontier state:** the `posixmodule.c` missing-`sddl.h` blocker is cleared under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is the distinct VC6 `long long` family at `posixmodule.c(1482)`. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`_operator.c` designated-initializer family slice)

Date: 2026-09-21 07:04 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before this run, `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` were read. The nested `cpython/` checkout remains detached with all pre-existing local port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains external/local-only through Wine using `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified banner is `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded frontier was force-re-probed first and remained applicable: `_blake2/blake2s_impl.c` compiled, 39 sources compiled, and `_operator.c` was the first blocker with the same C99 designated-initializer family at lines `(1814)` and `(1887)`. One focused external Codex coding lane implemented only this TDD slice in the existing checkout, preserving local changes and avoiding commits, pushes, and publication. The lane reported the required RED focused assertions before the source edit and GREEN afterward; no independent review is claimed.

This slice changed only:

- `cpython/Modules/_operator.c` — converted `methodcaller_type_spec` and `operatormodule` from designated fields to declared-order positional fields. All values and module/type behavior are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added focused structural assertions for both positional initializers.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all wine cmd /c 'call Z:\\\\home\\\\ubuntu\\\\Organized\\\\Legacy-Ports\\\\Projects\\\\python-win9x\\\\MSVC600\\\\VC98\\\\Bin\\\\VCVARS32.BAT && cl'` | exit 0; banner `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; `_blake2/blake2s_impl.c` compiled, 39 sources compiled; first blocker `_operator.c(1814)` and `(1887)`, both C2059 syntax errors for designated fields; summary `total=39 compiled=38 cached=0`. |
| delegated `codex exec -s workspace-write --skip-git-repo-check ...` | exit 0; added the two focused assertions, reported the expected RED failures, applied only the two `_operator.c` positional-initializer edits, regenerated the compatibility patch, and reported GREEN; no commit/push/publication. |
| focused RED assertions | exit 1 as required by TDD; both new positional-initializer assertions failed before the source edit. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` | exit 0; `ALL TESTS PASSED`, including both new `_operator.c` assertions. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after this slice | exit 2; `_operator.c` compiled past both designated-initializer blockers. The next first blocker is `posixmodule.c(39)`, fatal C1083 because `sddl.h` is unavailable; summary `total=40 compiled=39 cached=0`. Existing warnings remain `arraymodule.c(2247)` C4761, `audioop.c(1536)`/`(1609)` C4761, `faulthandler.c(542)` C4047, and `mathmodule.c(1336)` C4113/C4133. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | exit 0; all applicable regression suites and shell syntax checks passed. |
| `git -C cpython diff --check`; patch regeneration plus `cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; nested source diff is clean and the compatibility patch matches the complete nested source diff byte-for-byte. |

**Current compile-frontier state:** `_operator.c` now compiles through its remaining designated-initializer family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is the distinct Win9x/SDK header blocker in `posixmodule.c(39)`: missing `sddl.h`. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`_operator.c` `methodcaller_new()` C89 declaration-order slice)

Date: 2026-09-21 04:55 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before changing anything, `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` were read. The nested `cpython/` checkout remains detached with all pre-existing local port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains external/local-only through Wine using `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified banner is `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded frontier was force-re-probed first and remained applicable: `_blake2/blake2s_impl.c` compiled, 38 sources compiled, and `_operator.c(1596)` was the first stable blocker. One focused external Codex coding lane implemented only this TDD slice in the existing checkout, preserving local changes and avoiding commits, pushes, and publication. The lane reported the required RED focused assertion before the source edit and GREEN afterward; no independent review is claimed.

This slice changed only:

- `cpython/Modules/_operator.c` — hoisted `_operator_state *state` into `methodcaller_new()`'s opening declaration group and changed its initializer to an assignment at the original `PyType_GetModuleState(type)` evaluation point. Allocation and methodcaller behavior are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added one focused structural assertion for the C89-safe declaration and original-point assignment.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all wine cmd /c 'call Z:\\\\home\\\\ubuntu\\\\Organized\\\\Legacy-Ports\\\\Projects\\\\python-win9x\\\\MSVC600\\\\VC98\\\\Bin\\\\VCVARS32.BAT && cl'` | exit 0; banner `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; `_blake2/blake2s_impl.c` compiled, 38 sources compiled; first blocker `_operator.c(1596)` C2275/C2065/C2223/C2198 for the post-statement `_operator_state *state`; later designated-initializer blockers at `(1813)` and `(1886)`; summary `total=39 compiled=38 cached=0`. |
| delegated `codex exec -s workspace-write --skip-git-repo-check ...` | exit 0; added the focused assertion, reported the expected RED failure, applied only `methodcaller_new()`, regenerated the compatibility patch, and reported GREEN; no commit/push/publication. |
| focused RED assertion | exit 1 as required by TDD; `AssertionError: methodcaller_new needs an opening C89 state declaration and original-point assignment`. |
| focused GREEN assertion | exit 0; `ok - methodcaller_new uses an opening C89 state declaration and original-point assignment`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` | exit 0; `ALL TESTS PASSED`, including the new `methodcaller_new` assertion. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after this slice | exit 2; `_operator.c` compiled past line 1596. The next first blockers are the distinct designated initializers at `(1814)` and `(1887)`; summary `total=39 compiled=38 cached=0`. Existing warnings remain `arraymodule.c(2247)` C4761, `audioop.c(1536)`/`(1609)` C4761, `faulthandler.c(542)` C4047, and `mathmodule.c(1336)` C4113/C4133. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | exit 0; all applicable regression suites and shell syntax checks passed. |
| `git -C cpython diff --check`; `cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; nested source diff is clean and the compatibility patch matches the complete nested source diff byte-for-byte. |

**Current compile-frontier state:** `methodcaller_new()` now compiles through its C89 declaration-order family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is the distinct `_operator.c` designated-initializer family at lines 1814 and 1887. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`_operator.c` `attrgetter_type_spec` positional-initializer slice)

Date: 2026-09-21 02:46 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before changing anything, `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` were read. The nested `cpython/` checkout remains detached with all pre-existing local port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains external/local-only through Wine using `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the independently verified banner is `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded `_blake2/blake2s_impl.c` sequence was force-re-probed first and remained applicable: `_blake2/blake2s_impl.c` compiled, 38 sources compiled, and `_operator.c(1558)` was the first stable blocker. One focused external Codex coding lane implemented only this TDD slice in the existing checkout, preserving local changes and avoiding commits, pushes, and publication. The lane reported the required RED focused assertion before the source edit and GREEN afterward; no independent review is claimed.

This slice changed only:

- `cpython/Modules/_operator.c` — converted `attrgetter_type_spec` from designated fields to declared-order positional fields; values and behavior are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added one focused structural assertion for the positional initializer.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all wine cmd /c 'call Z:\\\\home\\\\ubuntu\\\\Organized\\\\Legacy-Ports\\\\Projects\\\\python-win9x\\\\MSVC600\\\\VC98\\\\Bin\\\\VCVARS32.BAT && cl'` | exit 0; banner `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; `_blake2/blake2s_impl.c` compiled, 38 sources compiled; first blocker `_operator.c(1558)` C2059 for the designated initializer; later blockers at `(1596)`, `(1813)`, and `(1886)`; summary `total=39 compiled=38 cached=0`. |
| delegated `codex exec --approve-for-me --skip-git-repo-check ...` | exit 0; added the focused assertion, reported the expected RED failure before the source edit, applied only `attrgetter_type_spec`, regenerated the compatibility patch, and reported GREEN; no commit/push/publication. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` | exit 0; `ALL TESTS PASSED`, including `attrgetter_type_spec uses a C89-compatible declared-order positional initializer`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after this slice | exit 2; `_operator.c` compiled past line 1558. The next first blocker is the distinct C89 declaration-order family at `(1596)` for `_operator_state *state`; later designated-initializer blockers remain at `(1813)` and `(1886)`; summary `total=39 compiled=38 cached=0`. Existing warnings remain `arraymodule.c(2247)` C4761, `audioop.c(1536)`/`(1609)` C4761, `faulthandler.c(542)` C4047, and `mathmodule.c(1336)` C4113/C4133. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | exit 0; all applicable regression suites and shell syntax checks passed. |
| `git -C cpython diff --check` | exit 0; nested source diff is clean. |
| `cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; compatibility patch matches the complete nested source diff byte-for-byte. |

**Current compile-frontier state:** `attrgetter_type_spec` now compiles through its designated-initializer family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is `_operator.c(1596)`, the distinct `methodcaller_new()` C89 declaration-order family. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`_operator.c` `attrgetter_vectorcall()` C89 declaration-order slice)

Date: 2026-09-21 00:38 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before changing anything, `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` were read. The nested `cpython/` checkout remains detached with all pre-existing local port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains external/local-only through Wine using `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the independently verified banner is `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded frontier was force-re-probed first and remained applicable: `_blake2/blake2s_impl.c` compiled, 38 sources compiled, and `_operator.c(1402)` was the first stable blocker. One focused external Codex coding lane implemented only this TDD slice in the existing checkout, preserving local changes and avoiding commits, pushes, and publication. The lane reported the required RED focused assertion before the source edit and GREEN afterward; no independent review is claimed.

This slice changed only:

- `cpython/Modules/_operator.c` — hoisted `Py_ssize_t nargs` into `attrgetter_vectorcall()`'s opening declaration group and changed its initializer to an assignment at the original evaluation point. Argument validation and call behavior are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added one focused structural assertion for the C89-safe declaration and original-point assignment.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all wine cmd /c 'call Z:\\home\\ubuntu\\Organized\\Legacy-Ports\\Projects\\python-win9x\\MSVC600\\VC98\\Bin\\VCVARS32.BAT && cl'` | exit 0; banner `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; `_blake2/blake2s_impl.c` compiled, 38 sources compiled; first blocker `_operator.c(1402)` C2275/C2146/C2065 for post-statement `Py_ssize_t nargs`; later blockers at `(1556)`, `(1594)`, `(1811)`, and `(1884)`; summary `total=39 compiled=38 cached=0 skipped=0`. |
| focused Codex lane | exit 0; added the focused assertion, reported the expected RED failure, applied only the `attrgetter_vectorcall()` declaration-order edit, ran GREEN, regenerated the compatibility patch, and made no commit/push/publication. |
| focused RED assertion | exit 1 as required by TDD; `AssertionError: attrgetter_vectorcall needs an opening C89 nargs declaration and original-point assignment`. |
| focused GREEN assertion | exit 0; `ok - attrgetter_vectorcall uses an opening C89 nargs declaration and original-point assignment`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` | exit 0; `ALL TESTS PASSED`, including the new `attrgetter_vectorcall` assertion. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after this slice | exit 2; `_operator.c` compiled past line 1402. The next first blocker is the distinct designated initializer at `(1558)`; later blockers remain at `(1596)`, `(1813)`, and `(1886)`; summary `total=39 compiled=38 cached=0`. Existing warnings remain `arraymodule.c(2247)` C4761, `audioop.c(1536)`/`(1609)` C4761, `faulthandler.c(542)` C4047, and `mathmodule.c(1336)` C4113/C4133. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | exit 0; all applicable regression suites and shell syntax checks passed. |
| `git -C cpython diff --check`; patch regeneration plus `cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; nested source diff passed `--check` and the compatibility patch matches the complete nested source diff byte-for-byte. |

**Current compile-frontier state:** `attrgetter_vectorcall()` now compiles through its C89 declaration-order family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is `_operator.c(1558)`, the distinct designated-initializer family. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`_operator.c` `attrgetter_new()` C89 declaration-order slice)

Date: 2026-09-20 22:30 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before changing anything, `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` were read. The nested `cpython/` checkout remains detached with all pre-existing local port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains external/local-only through Wine using `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified banner is `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded `_blake2/blake2s_impl.c` sequence was force-re-probed first and remained applicable: `_blake2/blake2s_impl.c` compiled, 38 sources compiled, and `_operator.c(1311)` was the first stable blocker. One focused Codex coding lane implemented only this TDD slice in the existing checkout, preserving local changes and avoiding commits, pushes, and publication. The lane reported the required RED focused assertion before the source edit and GREEN afterward; no independent review is claimed.

This slice changed only:

- `cpython/Modules/_operator.c` — hoisted `_operator_state *state` into `attrgetter_new()`'s opening declaration group and changed its initializer to an assignment at the original module-state lookup point. Attribute-chain construction and allocation behavior are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added one focused structural assertion for the C89-safe declaration and original-point assignment.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all wine cmd /c 'call .../VCVARS32.BAT && cl'` | exit 0; banner `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; `_blake2/blake2s_impl.c` compiled, 38 sources compiled; first blocker `_operator.c(1311)` C2275/C2065 for post-statement `_operator_state *state`; later blockers at `(1401)`, `(1555)`, `(1593)`, `(1810)`, and `(1883)`; summary `total=39 compiled=38 cached=0 skipped=0`. |
| `codex exec -s workspace-write --skip-git-repo-check ...` | exit 0; added the focused assertion, performed the requested RED/GREEN TDD cycle, applied only the `attrgetter_new()` declaration-order edit, regenerated the compatibility patch, and made no commit/push/publication. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` | exit 0; `ALL TESTS PASSED`, including `attrgetter_new uses an opening C89 state declaration and original-point assignment`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after this slice | exit 2; `_operator.c` compiled past line 1311. The next first blocker is the distinct `itemgetter_vectorcall()` declaration-order family at `(1402)` with C2275/C2146/C2065; later blockers remain at `(1556)`, `(1594)`, `(1811)`, and `(1884)`; summary `total=39 compiled=38 cached=0 skipped=0`. Existing warnings remain `arraymodule.c(2247)` C4761, `audioop.c(1536)`/`(1609)` C4761, `faulthandler.c(542)` C4047, and `mathmodule.c(1336)` C4113/C4133. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh` | exit 0; all applicable regression suites and shell syntax checks passed. |
| `git -C cpython diff --check`; patch regeneration plus `cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; nested source diff passed `--check` and the compatibility patch matches the complete nested source diff byte-for-byte. |

**Current compile-frontier state:** `attrgetter_new()` now compiles through its C89 declaration-order family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is `_operator.c(1402)`, the distinct `itemgetter_vectorcall()` declaration-order family. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`_operator.c` `itemgetter_type_spec` positional-initializer slice)

Date: 2026-09-20 20:20 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before changing anything, `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` were read. The nested `cpython/` checkout remains detached with all pre-existing local port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains external/local-only through Wine using `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified banner is `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded `_blake2/blake2s_impl.c` sequence was force-re-probed first and was no longer the active frontier: `_blake2/blake2s_impl.c` compiled, 38 sources compiled, and `_operator.c` remained first. The first stable blocker was the distinct C99 designated initializer in `itemgetter_type_spec` at `_operator.c(1189)`. The Hermes delegation tool failed before launch because the runtime lacks the `anthropic` package. One focused external Codex coding lane then implemented this exact TDD slice, preserving local changes and avoiding commits, pushes, and publication. No independent review is claimed.

This slice changed only:

- `cpython/Modules/_operator.c` — converted `itemgetter_type_spec` from designated fields to declared-order positional fields; values and behavior are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added one focused structural assertion for the positional initializer.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 38 sources compiled; first blocker `_operator.c(1189)` C2059 for the designated initializer; later blockers at `(1311)`, `(1401)`, `(1555)`, `(1593)`, `(1810)`, and `(1883)`; summary `total=39 compiled=38 cached=0 skipped=0`. |
| `codex exec -s workspace-write --skip-git-repo-check ...` | exit 0; added the focused assertion, performed the requested RED/GREEN TDD cycle, changed only `itemgetter_type_spec`, regenerated the compatibility patch, and made no commit/push/publication. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` | exit 0; `ALL TESTS PASSED`, including `itemgetter_type_spec uses a C89-compatible declared-order positional initializer`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after this slice | exit 2; `_operator.c` compiled past line 1189. The next first blocker is the distinct mixed declaration at `(1311)` (`_operator_state *state`); later blockers remain at `(1401)`, `(1555)`, `(1593)`, `(1810)`, and `(1883)`; summary `total=39 compiled=38 cached=0 skipped=0`. Existing warnings remain `arraymodule.c(2247)` C4761, `audioop.c(1536)`/`(1609)` C4761, `faulthandler.c(542)` C4047, and `mathmodule.c(1336)` C4113/C4133. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh` | exit 0; all applicable regression suites and shell syntax checks passed. |
| `git -C cpython diff --check`; patch regeneration plus `cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; nested source diff passed `--check` and the compatibility patch matches the complete nested source diff byte-for-byte. |

**Current compile-frontier state:** `itemgetter_type_spec` now compiles under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is `_operator.c(1311)`, the distinct C89 declaration-order family. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`_operator.c` `itemgetter_vectorcall()` C89 declaration-order slice)

Date: 2026-09-20 18:11 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before changing anything, `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` were read. The nested `cpython/` checkout remains detached with all pre-existing local port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains external/local-only through Wine using `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified banner is `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded frontier was force-re-probed first and remained applicable: 38 sources compiled and `_operator.c` remained first. The first stable defect family was MSVC6's rejection of `itemgetter_vectorcall()`'s post-statement `Py_ssize_t nargs` declaration at line 1081. The Hermes delegation path was unavailable because the runtime lacks the `anthropic` package. One focused Codex coding lane then implemented this exact TDD slice in the existing checkout, preserving local changes and avoiding commits, pushes, and publication. No independent review is claimed.

This slice changed only:

- `cpython/Modules/_operator.c` — hoisted `Py_ssize_t nargs` into `itemgetter_vectorcall()`'s opening declaration group and changed its initializer to an assignment at the original evaluation point. Argument validation and call behavior are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added one focused structural assertion for the C89-safe declaration and original-point assignment.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

||| Command | Result |
||---|---|
|| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all wine cmd /c 'call .../VCVARS32.BAT && cl'` | exit 0; banner `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. |
|| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 38 sources compiled; first blocker `_operator.c(1081)` C2275/C2146/C2065 for post-statement `Py_ssize_t nargs`; summary `total=39 compiled=38 cached=0 skipped=0`. |
|| Hermes focused delegation | failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child files were used. |
|| `codex exec -s workspace-write --skip-git-repo-check ...` | exit 0; delegated lane added the focused assertion, reported the required RED focused failure before the source edit, applied only the `itemgetter_vectorcall()` declaration-order edit, and regenerated the compatibility patch; no commit, push, or publication. |
|| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after implementation | exit 0; `ALL TESTS PASSED`, including `itemgetter_vectorcall uses an opening C89 nargs declaration and original-point assignment`. |
|| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after implementation | exit 2; `_operator.c` compiled past line 1081. The next first blocker is the distinct designated initializer at `_operator.c(1189)` (reported as line 1187 before the edit); later distinct blockers remain at `(1311)`, `(1401)`, `(1555)`, `(1810)`, and `(1883)`. Summary `total=39 compiled=38 cached=0 skipped=0`. Existing warnings remain `arraymodule.c(2247)` C4761, `audioop.c(1536)`/`(1609)` C4761, `faulthandler.c(542)` C4047, and `mathmodule.c(1336)` C4113/C4133. |
|| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh` | exit 0; all applicable regression suites and shell syntax checks passed. |
|| `git -C cpython diff --check`; patch regeneration plus `cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; nested source diff passed `--check` and the compatibility patch matches the complete nested source diff byte-for-byte. |

**Current compile-frontier state:** `itemgetter_vectorcall()` now compiles through its C89 declaration-order family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is the distinct `_operator.c` designated initializer at line 1189. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`_operator.c` `itemgetter_new()` C89 declaration-order slice)

Date: 2026-09-20 16:05 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before changes, `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` were read. The nested `cpython/` checkout remains detached with all pre-existing local port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains external/local-only through Wine using `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified banner remains `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded frontier was force-re-probed first and remained applicable: 38 sources compiled and `_operator.c` remained first. The first stable defect family was MSVC6's rejection of `itemgetter_new()`'s post-statement `_operator_state *state` declaration at line 1006. One focused Codex coding-agent delegation implemented exactly this TDD slice in the existing checkout, preserving local changes and avoiding commits, pushes, and publication. No independent review is claimed.

This slice changed only:

- `cpython/Modules/_operator.c` — hoisted `_operator_state *state` into `itemgetter_new()`'s opening declaration group and changed its initializer to an assignment at the original module-state lookup point. Allocation and itemgetter behavior are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added one focused structural assertion for the C89-safe declaration and original-point assignment.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

|| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 38 sources compiled; first blocker `_operator.c(1006)` C2275/C2065 for post-statement `_operator_state *state`; summary `total=39 compiled=38 cached=0 skipped=0`. |
| `codex exec -s workspace-write --skip-git-repo-check ...` | exit 0; delegated lane added the focused assertion, reported the required RED focused failure before the source edit, applied only the `itemgetter_new()` declaration-order slice, regenerated the compatibility patch, and ran GREEN; no commit, push, or publication. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after implementation | exit 0; `ALL TESTS PASSED`, including `itemgetter_new uses an opening C89 state declaration and original-point assignment`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after implementation | exit 2; `_operator.c` compiled past line 1006. The next first blocker is `_operator.c(1081)` C2275/C2146/C2065 for `Py_ssize_t nargs`; later distinct designated-initializer blockers remain at `(1187)`, `(1553)`, `(1808)`, and `(1881)`. Summary `total=39 compiled=38 cached=0 skipped=0`. Existing warnings remain `arraymodule.c(2247)` C4761, `audioop.c(1536)`/`(1609)` C4761, `faulthandler.c(542)` C4047, and `mathmodule.c(1336)` C4113/C4133. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh` | exit 0; all applicable regression suites and shell syntax checks passed. |
| `git -C cpython diff --check`; `cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; nested source diff passed `--check` and the compatibility patch matches the complete nested source diff byte-for-byte. |

**Current compile-frontier state:** `itemgetter_new()` now compiles through its C89 declaration-order family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is `_operator.c(1081)`, the distinct `Py_ssize_t nargs` declaration-order family. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`_opcode.c` positional-initializer slice)

Date: 2026-09-20 13:38 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before changes, `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` were read. The nested `cpython/` checkout remains detached with all pre-existing local port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains external/local-only through Wine using `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified compiler banner remains `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded frontier was force-re-probed first and remained applicable: 37 sources compiled and `_opcode.c` remained first. The first stable defect was MSVC6's rejection of `opcodemodule`'s C99 designated initializer at line 104. One focused Codex coding-agent delegation implemented exactly this TDD slice in the existing checkout, preserving local changes and avoiding commits, pushes, and publication. No independent review is claimed.

This slice changed only:

- `cpython/Modules/_opcode.c` — converted `opcodemodule` to declared-order positional fields, with explicit `NULL` values for omitted slots. Module metadata and behavior are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added one focused structural assertion for the positional initializer.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 37 sources compiled; first blocker `_opcode.c(104)` C2059 syntax error for `.m_name`; summary `total=38 compiled=37 cached=0 skipped=0`. |
| `codex exec -s workspace-write --skip-git-repo-check ...` | exit 0; delegated lane added the focused assertion, reported the required RED focused failure before the source edit, applied only the `_opcode.c` positional initializer, and ran GREEN; no commit, push, or publication. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after implementation | exit 0; `ALL TESTS PASSED`, including `opcodemodule uses a C89-compatible declared-order positional initializer`. |
| `git diff --check` | exit 2 due only to pre-existing generated-patch trailing whitespace in `compat/msvc600/cpython-3.11.16-vc6-headers.patch`; source diff checks were run separately. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after implementation | exit 2; `_opcode.c` compiled successfully. The next first blocker is `_operator.c(1006)` with C89 mixed declaration errors, followed by distinct `_operator.c` designated initializers at `(1186)`, `(1552)`, `(1807)`, and `(1880)`; summary `total=39 compiled=38 cached=0 skipped=0`. Existing warnings remain `arraymodule.c(2247)` C4761, `audioop.c(1536)`/`(1609)` C4761, `faulthandler.c(542)` C4047, and `mathmodule.c(1336)` C4113/C4133. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh` | exit 0; all applicable regression suites and shell syntax checks passed. |
| `git -C cpython diff --check`; `cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; nested source diff passed `--check` and the compatibility patch matches the complete nested source diff byte-for-byte. |

**Current compile-frontier state:** `_opcode.c` now compiles under MSVC6 (`cl.exe` 12.00.8804) through Wine after its designated-initializer family was removed. The next narrow frontier is `_operator.c(1006)`, beginning with its distinct C89 declaration-order family. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`mmap_gfind()` C89 declaration-order slice)

Date: 2026-09-20 09:21 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before changes, `PORT_STATUS.md`, `README.md`, and `references/python-3-win9x-msvc6.md` were read. The nested `cpython/` checkout remains detached with all pre-existing local port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains external/local-only through Wine using `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified compiler banner remains `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded `_blake2/blake2s_impl.c` sequence was force-re-probed first and remained applicable: 36 sources compiled and `mmapmodule.c` remained first. The first stable defect family was MSVC6's rejection of the post-statement `Py_ssize_t res` declaration in `mmap_gfind()`. One focused Codex coding-agent delegation implemented exactly this TDD slice in the existing checkout, preserving local changes and avoiding commits, pushes, and publication. No independent review is claimed.

This slice changed only:

- `cpython/Modules/mmapmodule.c` — hoisted `Py_ssize_t res` into `mmap_gfind()`'s opening declaration group and removed the later declaration. Search result assignments and control flow are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added one focused structural assertion for the C89-safe declaration and unchanged branch assignments.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 36 sources compiled; first stable blocker `mmapmodule.c(357)` C2275/C2146/C2065 for post-statement `Py_ssize_t res`; later designated-initializer blockers remained at `(1207)` and `(1788)`; summary `total=37 compiled=36 cached=0 skipped=0`. |
| `codex exec -s workspace-write --skip-git-repo-check ...` | exit 0; delegated lane added the focused assertion and implemented only the `mmap_gfind()` declaration-order slice; no commit, push, or publication. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after implementation | exit 0; `ALL TESTS PASSED`, including `mmap_gfind uses an opening C89 res declaration and original-point assignments`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after implementation | exit 2; `mmap_gfind()` compiled past the declaration-order family. The next first blockers are the distinct designated initializers at `mmapmodule.c(1207)` and `(1788)`; summary `total=37 compiled=36 cached=0`. Existing warnings remain `arraymodule.c(2247)` C4761, `audioop.c(1536)`/`(1609)` C4761, `faulthandler.c(542)` C4047, and `mathmodule.c(1336)` C4113/C4133. |
| `bash -n` plus public/core/PathCch/getpath/stdint/frontier regression suites | exit 0; all applicable suites passed and the focused frontier suite ended with `ALL TESTS PASSED`. |
| `git -C cpython diff --check`; patch regeneration plus `cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; the nested source diff passed `--check` and the compatibility patch matches the complete nested source diff byte-for-byte. The generated patch retains pre-existing whitespace-only lines, so checking the patch file itself with outer `git diff --check` reports those inherited lines. |

**Current compile-frontier state:** `mmap_gfind()` now compiles through its C89 declaration-order family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is the distinct designated-initializer family in `mmapmodule.c` at lines 1207 and 1788. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`mmap_close_method()` C89 declaration-order slice)

Date: 2026-09-20 07:13 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before changing anything, `PORT_STATUS.md`, `README.md`, and `references/python-3-win9x-msvc6.md` were read. The nested `cpython/` checkout remains detached with all pre-existing local port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains external/local-only through Wine using `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified compiler banner remains `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded `_blake2/blake2s_impl.c` sequence was force-re-probed first and remained applicable: 36 sources compiled and `mmapmodule.c` remained first. The first stable defect family was MSVC6's rejection of post-statement declarations in `mmap_close_method()`. One focused Codex coding-agent delegation implemented exactly this TDD slice in the existing checkout, preserving local changes and avoiding commits, pushes, and publication. No independent review is claimed.

This slice changed only:

- `cpython/Modules/mmapmodule.c` — hoisted the Windows-only `HANDLE map_handle`, `HANDLE file_handle`, and `char *data` declarations before executable statements, then assigned them at their original evaluation point. Resource cleanup order and behavior are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added one focused structural assertion for the C89-safe declarations and original-point assignments.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 36 sources compiled; first stable blocker `mmapmodule.c(194)` C2275/C2146/C2065 for post-statement `HANDLE` declarations, with later distinct blockers at `(352)`, `(1202)`, and `(1783)`; summary `total=37 compiled=36 cached=0 skipped=0`. |
| `codex exec -s workspace-write --skip-git-repo-check ...` | exit 0; delegated lane added the focused assertion, reported the required RED failure before the source edit, applied only the `mmap_close_method()` declaration-order slice, and reported GREEN; no commit, push, or publication. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after implementation | exit 0; `ALL TESTS PASSED`, including `mmap_close_method uses C89-safe Windows declarations and original-point assignments`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after implementation | exit 2; `mmap_close_method()` compiled past the declaration-order family. The next first blocker is `mmapmodule.c(357)` C2275/C2146/C2065 for `Py_ssize_t res`; later distinct designated initializers remain at `(1207)` and `(1788)`. Summary `total=37 compiled=36 cached=0 skipped=0`. |
| `bash -n` plus public/core/PathCch/getpath/stdint/frontier regression suites | exit 0; all applicable suites passed and the focused frontier suite ended with `ALL TESTS PASSED`. |
| `git -C cpython diff --check`; patch regeneration plus `cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; the nested source diff is clean and the compatibility patch matches the complete nested source diff byte-for-byte. |

**Current compile-frontier state:** `mmap_close_method()` now compiles through its C89 declaration-order family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is the distinct `Py_ssize_t res` declaration-order family in `mmapmodule.c(357)`. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`mmapmodule.c` MSVC6 `PY_LONG_LONG` spelling slice)

Date: 2026-09-20 05:03 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before changing anything, `PORT_STATUS.md`, `README.md`, and `references/python-3-win9x-msvc6.md` were read. The nested `cpython/` checkout remains detached with all pre-existing local port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains external/local-only through Wine using `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified compiler banner remains `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded `_blake2/blake2s_impl.c` sequence was force-re-probed first and remained applicable: 36 sources compiled and `mmapmodule.c` remained first. The first stable defect family was MSVC6's rejection of `long long` spellings in the Windows mmap offset/size declarations and casts. One focused Codex coding-agent delegation implemented exactly this TDD slice in the existing checkout, preserving local changes and avoiding commits, pushes, and publication. No independent review is claimed.

This slice changed only:

- `cpython/Modules/mmapmodule.c` — replaced the five active Windows `long long` declarations/casts with `PY_LONG_LONG`; behavior and arithmetic are unchanged. The explanatory comment remains untouched.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added one focused structural assertion for the mmap 64-bit spellings and size-combining casts.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 36 sources compiled; first stable blocker `mmapmodule.c(103)` C2632 (`'long' followed by 'long' is illegal`), with later declaration-order/designated-initializer diagnostics; summary `total=37 compiled=36 cached=0 skipped=0`. |
| `codex exec -s workspace-write --skip-git-repo-check ...` | exit 0; delegated lane added the focused assertion, reported the required RED focused failure before the source edit, applied only the mmap `PY_LONG_LONG` spelling slice, and ran GREEN; no commit, push, or publication. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after implementation | exit 0; `ALL TESTS PASSED`, including `mmap preserves signed 64-bit sizes and offsets using PY_LONG_LONG`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after implementation | exit 2; `mmapmodule.c` compiled past the `long long` family. The next first blocker is `mmapmodule.c(194)` C2275/C2146/C2065 for post-statement `HANDLE` declarations; later distinct blockers remain at `(352)`, `(1202)`, and `(1783)`. Summary `total=37 compiled=36 cached=0 skipped=0`. |
| `bash -n` plus public/core/PathCch/getpath/stdint/frontier regression suites | exit 0; all applicable suites passed and the focused frontier suite ended with `ALL TESTS PASSED`. |
| `git -C cpython diff --check`; patch regeneration plus `cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; the nested source diff is clean and the compatibility patch matches the complete nested source diff byte-for-byte. |

**Current compile-frontier state:** `mmapmodule.c` now compiles through its MSVC6 `long long` spelling family under `cl.exe` 12.00.8804 through Wine. The next narrow frontier is the distinct C89 declaration-order/API family at `mmapmodule.c(194)`. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`md5module.c` `_md5module` positional-initializer slice)

Date: 2026-09-20 02:55 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before changing anything, `PORT_STATUS.md`, `README.md`, and `references/python-3-win9x-msvc6.md` were read. The nested `cpython/` checkout remains detached with all pre-existing local port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains external/local-only through Wine using `WINEPREFIX=/home/ubuntu/.wine-win9xport`; independently verified compiler banner: `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded `_blake2/blake2s_impl.c` sequence was force-re-probed first, but it was no longer the active frontier: 36 sources compiled and `md5module.c` remained first. The first stable blocker was the distinct C99 designated initializer in `_md5module` at line 612. One focused Codex coding-agent delegation implemented exactly this TDD slice in the existing checkout, preserving local changes and avoiding commits, pushes, and publication. No independent review is claimed.

This slice changed only:

- `cpython/Modules/md5module.c` — replaced `_md5module`'s designated fields with declared-order positional fields, including the explicit `NULL` `m_doc` field. Values and behavior are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added one focused structural assertion for the positional initializer.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 35 sources compiled; first blocker `md5module.c(612)` C2059 `syntax error: '.'`; summary `total=36 compiled=35 cached=0 skipped=0`. Existing warnings remained in `arraymodule.c`, `audioop.c`, `faulthandler.c`, and `mathmodule.c`. |
| `codex exec -s workspace-write --skip-git-repo-check ...` | exit 0; delegated lane added the focused assertion, reported the required RED focused failure before the source edit, applied only the `_md5module` positional initializer, ran GREEN, and did not commit, push, or publish. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after implementation | exit 0; `ALL TESTS PASSED`, including `_md5module uses a C89-compatible declared-order positional initializer`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after this slice | exit 2; `md5module.c` compiled past line 612. The next first blocker is `mmapmodule.c(103)` C2632 (`'long' followed by 'long' is illegal`), followed by distinct declaration-order and designated-initializer diagnostics; summary `total=37 compiled=36 cached=0 skipped=0`. |
| `bash scripts/vc6-probe.sh` | exit 0; the independent `Programs/python.c` probe still links no artifact and its compile-only `cl.exe` invocation exited 0. |
| `wine cmd /c 'call .../VCVARS32.BAT && cl'` | exit 0; banner `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. |
| `bash -n` plus public/core/PathCch/getpath/stdint/frontier regression suites; `git -C cpython diff --check`; patch regeneration and `cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; all applicable suites passed and the compatibility patch matches the complete nested source diff byte-for-byte. |

**Current compile-frontier state:** `_md5module` now compiles through its designated-initializer family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is the distinct `mmapmodule.c(103)` `long long` spelling family. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`md5module.c` `_md5_md5_impl` C89 declaration-order slice)

Date: 2026-09-20 00:46 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before changing anything, `PORT_STATUS.md`, `README.md`, and `references/python-3-win9x-msvc6.md` were read. The nested `cpython/` checkout remains detached with all pre-existing local port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains external/local-only through Wine using `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the recorded compiler banner remains `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded `md5module.c` frontier was force-re-probed first and remained applicable: 35 sources compiled and `md5module.c` remained first. The first stable blocker was the distinct C89 declaration-order error at `_md5_md5_impl()` line 528 for `MD5State *st`; the later designated initializer at line 611 was left untouched. One focused Codex coding-agent delegation implemented exactly this TDD slice in the existing checkout, preserving local changes and avoiding commits, pushes, and publication. No independent review is claimed.

This slice changed only:

- `cpython/Modules/md5module.c` — moved `MD5State *st` into the opening declaration group and changed its initializer to an assignment after buffer acquisition. Evaluation order and behavior are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added one focused structural assertion for the declaration and original-point assignment.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 35 sources compiled; first blocker `md5module.c(528)` C2143/C2065 for the post-statement `MD5State *st`; the later designated initializer was reported at `(611)`; summary `total=36 compiled=35 cached=0 skipped=0`. |
| `codex exec -s workspace-write --skip-git-repo-check ...` | exit 0; added the focused assertion, performed the requested red/green TDD cycle, made only the `_md5_md5_impl` declaration-order edit, and did not commit, push, or publish. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after implementation | exit 0; `ALL TESTS PASSED`, including the new `_md5_md5_impl` assertion. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after this slice | exit 2; `md5module.c` compiled past line 528. The next first blocker is the distinct designated initializer at `(612)`; summary `total=36 compiled=35 cached=0 skipped=0`. Existing warnings remain `arraymodule.c(2247)` C4761, `audioop.c(1536)`/`(1609)` C4761, `faulthandler.c(542)` C4047, and the `mathmodule.c(1336)` C4113/C4133 pair. |
| full applicable regression command (`bash -n` plus public/core/PathCch/getpath/stdint/frontier suites) | exit 0; all applicable suites passed. |
| `git -C cpython diff --check`; patch regeneration plus `cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; the compatibility patch matches the complete nested source diff byte-for-byte. |

**Current compile-frontier state:** `_md5_md5_impl()` now compiles through its C89 declaration-order family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is the distinct `md5_type_spec`-adjacent designated initializer at `md5module.c(612)`. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`md5module.c` `md5_type_spec` positional-initializer slice)

Date: 2026-09-19 22:39 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before changing anything, `PORT_STATUS.md`, `README.md`, and `references/python-3-win9x-msvc6.md` were read. The nested `cpython/` checkout remains detached with all pre-existing local port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains external/local-only through Wine using `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified banner remains `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded frontier was force-re-probed first and remained applicable: 35 sources compiled and `md5module.c` remained first. The prior `MD5_INT64` defect was already cleared. The first stable blocker was the distinct C99 designated initializer in `md5_type_spec` at line 498. One focused Codex coding-agent delegation implemented exactly this TDD slice in the existing checkout, preserving local changes and avoiding commits, pushes, and publication. No independent review is claimed.

This slice changed only:

- `cpython/Modules/md5module.c` — replaced `md5_type_spec`'s designated fields with declared-order positional fields, including the zero `itemsize` field; values and behavior are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added one focused structural assertion for the positional initializer.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 35 sources compiled; first blocker `md5module.c(498)` C2059 for the designated initializer, followed by declaration-order errors at `(527)` and another designated initializer at `(610)`; summary `total=36 compiled=35 cached=0 skipped=0`. |
| `codex exec -s workspace-write --skip-git-repo-check ...` | exit 0; added the focused assertion, performed the requested red/green TDD cycle, made only the `md5_type_spec` positional-initializer edit, and did not commit, push, or publish. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after implementation | exit 0; `ALL TESTS PASSED`, including the new `md5_type_spec` assertion. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after this slice | exit 2; `md5module.c` compiled past line 498. Next first blocker is the distinct C89 declaration-order error at `(527)` for `MD5State *st`; the later designated initializer remains at `(611)`; summary `total=36 compiled=35 cached=0 skipped=0`. Existing warnings remain `arraymodule.c(2247)` C4761, `audioop.c(1536)`/`(1609)` C4761, `faulthandler.c(542)` C4047, and the `mathmodule.c(1336)` C4113/C4133 pair. |
| full applicable regression command (`bash -n` plus public/core/PathCch/getpath/stdint/frontier suites) | exit 0; all applicable suites passed. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch`; `cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; the compatibility patch matches the complete nested source diff byte-for-byte. `git -C cpython diff --check` also exited 0. |

**Current compile-frontier state:** `md5_type_spec` now compiles through its designated-initializer family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is the distinct `MD5State *st` declaration-order family at `md5module.c(527)`. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`md5module.c` `MD5_INT64` VC6 64-bit spelling slice)

Date: 2026-09-19 20:30 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before this run, `PORT_STATUS.md`, `README.md`, and `references/python-3-win9x-msvc6.md` were read. The nested `cpython/` checkout remains detached with all pre-existing local port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains external/local-only through Wine using `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the independently verified banner is `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded `mathmodule.c` `fast_comb_limits2` frontier was force-re-probed first and remained applicable: 35 sources compiled and `md5module.c` was the first blocker. The first stable defect was the distinct VC6 `long long` spelling failure at `md5module.c(36)` C2632. One focused Codex coding-agent delegation implemented exactly this TDD slice in the existing checkout; it preserved local changes and did not commit, push, or publish. No independent review is claimed.

This slice changed only:

- `cpython/Modules/md5module.c` — changed `typedef long long MD5_INT64` to `typedef PY_LONG_LONG MD5_INT64`; MD5 layout and behavior are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added one focused structural assertion requiring the compiler-compatible typedef.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

|| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 35 sources compiled; first blocker `md5module.c(36)` C2632 for `long long`; later blockers at `(498)` designated initializer, `(527)` mixed declaration, and `(610)` designated initializer; summary `total=36 compiled=35 cached=0 skipped=0`. |
| `codex exec -s workspace-write --skip-git-repo-check ...` | exit 0; added the focused assertion, ran the required RED test, made the minimal typedef edit, and ran GREEN; no commit/push/publish. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit | exit 1 as required by TDD; only the new assertion failed: `MD5_INT64 must use CPython's compiler-compatible PY_LONG_LONG`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit | exit 2; `md5module.c` compiled past the `long long` family. Next first blocker is the distinct designated initializer at `(498)`, followed by declaration-order errors at `(527)` and another designated initializer at `(610)`; summary `total=36 compiled=35 cached=0 skipped=0`. Existing warnings remain `mathmodule.c(1336)` C4113/C4133, `arraymodule.c(2247)` C4761, `audioop.c(1536)`/`(1609)` C4761, and `faulthandler.c(542)` C4047. |
| `bash -n` plus public/core/PathCch/getpath/stdint/frontier regression suites | exit 0; all applicable suites passed and the focused frontier suite ended with `ALL TESTS PASSED`. |
| `git diff --check`; `git -C cpython diff --check`; patch regeneration plus `cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; nested source diff is clean and the compatibility patch matches the complete nested source diff byte-for-byte. |

**Current compile-frontier state:** `md5module.c` now compiles through the distinct VC6 `long long` spelling family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is the designated initializer at `md5module.c(498)`. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`mathmodule.c` `perm_comb_small` `fast_comb_limits2` C89 declaration-order slice)

Date: 2026-09-19 18:22 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. `PORT_STATUS.md`, `README.md`, and `references/python-3-win9x-msvc6.md` were read before changes. The nested `cpython/` checkout remains detached with all pre-existing local port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains external/local-only through Wine using `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified compiler is `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded frontier was force-re-probed first and remained applicable: 34 sources compiled and `mathmodule.c` was first. The first stable blocker was the C89 declaration-order defect at `mathmodule.c(3528)`–`(3532)`: `fast_comb_limits2` was declared after executable statements in `perm_comb_small()`. One focused coding-agent delegation was attempted; the Hermes delegation path failed because the runtime lacks the `anthropic` package. A direct Codex coding lane then added the focused regression assertion and ran the required red test, but stopped for confirmation because the array is `static const`; the minimal source edit was completed without broadening scope. No commits, pushes, or publication occurred.

This slice changed only:

- `cpython/Modules/mathmodule.c` — moved the complete `static const fast_comb_limits2[]` initializer into `perm_comb_small()`'s opening declaration group and removed the later declaration. The array contents, lookup, and control flow are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused structural assertion.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

|| Command | Result |
||---|---|
|| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 34 sources compiled; first stable blocker `mathmodule.c(3528)` C2143 and `(3532)` C2065/C2109 for `fast_comb_limits2`; later diagnostics began at `(3605)`; summary `total=35 compiled=34 cached=0 skipped=0`. |
|| Hermes focused delegation | failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child files were used. |
|| direct `codex exec -s workspace-write --skip-git-repo-check ...` | exit 0; added the focused assertion and ran it red with the expected `fast_comb_limits2` missing-declaration assertion; source remained unchanged when the lane stopped for confirmation. |
|| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | exit 0; `ALL TESTS PASSED`, including `perm_comb_small uses a C89 declaration-order-safe fast_comb_limits2 array`. |
|| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit | exit 2; `mathmodule.c` compiled past this family. Next first stable blocker is `md5module.c(36)` C2632 for `long long`, followed by a designated initializer at `(498)` and declaration-order errors at `(527)`; summary `total=36 compiled=35 cached=0 skipped=0`. Existing warnings remain `mathmodule.c(1336)` C4113/C4133, `arraymodule.c(2247)` C4761, `audioop.c(1536)`/`(1609)` C4761, and `faulthandler.c(542)` C4047. |
|| full applicable regression command (`bash -n` plus public/core/PathCch/getpath/stdint/frontier suites) | exit 0; all suites passed and the focused frontier suite ended with `ALL TESTS PASSED`. |
|| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch`; `cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; regenerated patch matches the complete nested source diff byte-for-byte. `git -C cpython diff --check` also exited 0. |

**Current compile-frontier state:** `perm_comb_small()` now compiles through its `fast_comb_limits2` C89 declaration-order family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is `md5module.c(36)`, beginning with the distinct VC6 `long long` family. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`mathmodule.c` `_check_long_mult_overflow` C89 declaration-order slice)

Date: 2026-09-19 16:11 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before changing anything, `PORT_STATUS.md`, `README.md`, and `references/python-3-win9x-msvc6.md` were read. The nested `cpython/` checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains external/local-only through Wine using `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified compiler is `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded `math_isqrt()` frontier was force-re-probed first and remained applicable: 34 sources compiled and `mathmodule.c` remained first. The first stable blocker was the distinct C89 declaration-order family in `_check_long_mult_overflow()` at lines 3186–3190. One focused Codex coding-agent delegation ran in the existing checkout with the requested scope, preserved local changes, and did not commit, push, or publish. The child added the focused assertion and implementation; no independent review is claimed.

This slice changed only the following:

- `cpython/Modules/mathmodule.c` — hoisted `diff`, `absdiff`, and `absprod` into `_check_long_mult_overflow()`'s opening declaration group and changed their original initializers to assignments at the same evaluation point. Overflow comparison and return behavior are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused assertion for the opening declarations, assignment order, and unchanged return logic.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 34 sources compiled; first stable blocker `mathmodule.c(3186)`–`(3190)` C2143/C2065 for the three post-statement `const double` declarations; later blockers at `(3525)` and `(3602)`; summary `total=35 compiled=34 cached=0 skipped=0`. |
| `codex exec -s workspace-write --skip-git-repo-check ...` | exit 0; focused implementation completed in the existing checkout; no commit, push, or publish. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after implementation | exit 0; `ALL TESTS PASSED`, including `_check_long_mult_overflow uses opening C89 declarations and original-point assignments`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after this slice | exit 2; `_check_long_mult_overflow()` compiled past this family. Next first stable blocker is the distinct declaration-order family at `mathmodule.c(3528)`–`(3532)` involving `fast_comb_limits2`; later diagnostics remain at `(3605)` onward. Summary `total=35 compiled=34 cached=0`. Existing warnings include `mathmodule.c(1336)` C4113/C4133, `arraymodule.c(2247)` C4761, `audioop.c(1536)`/`(1609)` C4761, and `faulthandler.c(542)` C4047. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh` | exit 0; all applicable regression suites and shell syntax checks passed. |
| `git -C cpython diff --check`; patch regeneration plus `cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; nested source diff is clean and the compatibility patch exactly matches the complete nested source diff. |

**Current compile-frontier state:** `_check_long_mult_overflow()` now compiles through its C89 declaration-order family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is `mathmodule.c(3528)`–`(3532)`, the `fast_comb_limits2` declaration-order family. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`mathmodule.c` `math_isqrt` C89 loop-counter slice)

Date: 2026-09-19 14:02 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before changes, `PORT_STATUS.md`, `README.md`, and `references/python-3-win9x-msvc6.md` were read. The nested `cpython/` checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. The verified compiler remains MSVC6 `12.00.8804` through Wine using `WINEPREFIX=/home/ubuntu/.wine-win9xport`.

The recorded `_blake2/blake2s_impl.c` sequence was force-re-probed first and remained applicable: 34 sources compiled and `mathmodule.c` remained first. The first stable blocker was the distinct C99 loop-counter declaration at `mathmodule.c(1945)`. One focused Codex coding-agent delegation ran in the existing checkout with the requested scope, preserved local changes, implemented only this slice, and did not commit, push, or publish. The child reported the required red-then-green focused TDD cycle; independent verification below confirms the green result. No independent review is claimed.

This slice changed only the following:

- `cpython/Modules/mathmodule.c` — added `int s` to `math_isqrt()`'s opening declaration group and changed `for (int s = ...)` to `for (s = ...)`; loop behavior is unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused assertion for the C89-safe `math_isqrt()` loop counter.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

|| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 34 sources compiled; first stable blocker `mathmodule.c(1945)` C2143/C2065/C2059/C2143 for the C99 `for (int s = ...)`; later blockers at `(3185)`, `(3524)`, and `(3601)`; summary `total=35 compiled=34 cached=0`. |
| focused Codex delegation: `codex exec -s workspace-write --skip-git-repo-check ...` | exit 0; child performed the requested focused TDD implementation, with no commit/push/publish. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after implementation | exit 0; `ALL TESTS PASSED`, including `math_isqrt uses an opening C89 loop counter declaration`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after this slice | exit 2; `mathmodule.c` compiled past line 1945. Next first stable blocker is the distinct declaration-order family at `(3186)`–`(3190)` (`perm_comb_small()`); later blockers are `(3525)` and `(3602)`. Summary `total=35 compiled=34 cached=0`. Existing warnings remain `mathmodule.c(1336)`, `arraymodule.c(2247)`, `audioop.c(1536)`, `(1609)`, and `faulthandler.c(542)`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh` | exit 0; all applicable regression suites and shell syntax checks passed. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch && git -C cpython diff --check && cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; patch exactly matches the complete nested source diff. |

**Current compile-frontier state:** `math_isqrt()` now compiles through its C89 loop-counter family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is `perm_comb_small()` at `mathmodule.c(3186)`–`(3190)`. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`mathmodule.c guarded VC6 `expm1` fallback slice)

Date: 2026-09-19 11:54 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before changes, `PORT_STATUS.md`, `README.md`, and `references/python-3-win9x-msvc6.md` were read. The nested `cpython/` checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. The verified compiler remains MSVC6 `12.00.8804` through Wine using `WINEPREFIX=/home/ubuntu/.wine-win9xport`.

The recorded `_blake2/blake2s_impl.c` sequence was force-re-probed first and remained applicable: 34 sources compiled and `mathmodule.c` remained first. The first stable blocker was the distinct missing-VC6-CRT `expm1` family at line 1350. One focused coding-agent delegation was attempted as required but failed before launch because the runtime lacks the `anthropic` package; no child files were used and no independent review is claimed. This slice addressed only `expm1`; later declaration-order blockers remain untouched.

- `cpython/Modules/mathmodule.c` — added an `_MSC_VER < 1300`-guarded `m_expm1()` fallback using a small-input quadratic approximation and `exp(x) - 1.0`; routed only `FUNC1(expm1, ...)` through it. Native compilers retain the CRT path through `#define m_expm1 expm1`.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion for the guarded fallback, small-input handling, native mapping, and routing.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 34 sources compiled; first stable blocker `mathmodule.c(1350)` C2065 for unavailable `expm1`; later declaration-order blockers at `(1936)`, `(3176)`, `(3515)`, and `(3592)`; summary `total=35 compiled=34 cached=0`. |
| focused coding-agent delegation | failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child files were used and no independent review is claimed. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit | exit 1 as required by TDD; `VC6 m_expm1 fallback missing`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit | exit 2; `mathmodule.c` compiled past `expm1`; next first stable blocker is the distinct declaration-order family at `(1945)`, with later families at `(3185)`, `(3524)`, and `(3601)`; summary `total=35 compiled=34 cached=0`. Existing warnings remain `mathmodule.c(1336)`, `arraymodule.c(2247)`, `audioop.c(1536)`, `(1609)`, and `faulthandler.c(542)`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh` | exit 0; all applicable regression suites and shell syntax checks passed. |
| `git -C cpython diff --check`; patch regeneration plus `cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; patch exactly matches the complete nested source diff. |

**Current compile-frontier state:** `expm1` now compiles through the guarded VC6 fallback under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is the declaration-order family in `mathmodule.c` at line 1945. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`mathmodule.c` guarded VC6 `exp2` fallback slice)

Date: 2026-09-19 09:46 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before changes, `PORT_STATUS.md`, `README.md`, and `references/python-3-win9x-msvc6.md` were read. The nested `cpython/` checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. The verified compiler remains MSVC6 `12.00.8804` through Wine using `WINEPREFIX=/home/ubuntu/.wine-win9xport`.

The recorded `_blake2/blake2s_impl.c` sequence was force-re-probed first and remained applicable: 34 sources compiled and `mathmodule.c` remained first. The first stable blocker was the distinct missing-VC6-CRT `exp2` family at line 1336. One focused coding-agent delegation was attempted as required but failed before launch because the runtime lacks the `anthropic` package; no child files were used and no independent review is claimed. This slice addressed only `exp2`; `expm1` and later declaration-order blockers remain untouched.

- `cpython/Modules/mathmodule.c` — added an `_MSC_VER < 1300`-guarded `m_exp2()` fallback using `exp(x * log(2.0))` with NaN preservation; routed only `FUNC1(exp2, ...)` through it. Native compilers retain the CRT path through `#define m_exp2 exp2`.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion for the guarded fallback, NaN handling, native mapping, and routing.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 34 sources compiled; first stable blocker `mathmodule.c(1336)` C2065 for unavailable `exp2`; `expm1` followed at `(1341)`; summary `total=35 compiled=34 cached=0`. |
| focused coding-agent delegation | failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child files were used and no independent review is claimed. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit | exit 1 as required by TDD; `VC6 m_exp2 fallback missing`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit | exit 2; `mathmodule.c` compiled past `exp2`; next first stable blocker is unavailable `expm1` at `(1350)`, followed by distinct declaration-order blockers at `(1936)`, `(3176)`, `(3515)`, and `(3592)`; summary `total=35 compiled=34 cached=0`. Existing warnings remain `arraymodule.c(2247)`, `audioop.c(1536)`, `(1609)`, and `faulthandler.c(542)`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh` | exit 0; all applicable regression suites and shell syntax checks passed. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch && git -C cpython diff --check && cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; patch exactly matches the complete nested source diff. |

**Current compile-frontier state:** `exp2` now compiles through the guarded VC6 fallback under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is the missing-CRT `expm1` family at `mathmodule.c(1350)`. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`mathmodule.c` `math_ceil` C89 declaration-order slice)

Date: 2026-09-19 06:00 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before changes, `PORT_STATUS.md`, `README.md`, and `references/python-3-win9x-msvc6.md` were read. The nested `cpython/` checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. The verified compiler remains MSVC6 `12.00.8804` through Wine using `WINEPREFIX=/home/ubuntu/.wine-win9xport`.

The recorded `_blake2/blake2s_impl.c` sequence was force-re-probed first and remained applicable: 34 sources compiled and `mathmodule.c` remained first. The first stable blocker was the distinct C89 declaration-order defect in `math_ceil()` at line 1306. One focused Codex coding-agent delegation was run in workspace-write mode with the existing checkout; it preserved local changes, implemented only this slice, and did not commit, push, or publish. This slice addressed only `math_ceil()`; later `copysign`, `exp2`, `expm1`, and other mathmodule blockers remain untouched.

- `cpython/Modules/mathmodule.c` — hoisted `double x` into `math_ceil()`'s opening declaration group and changed its initializer to an assignment at the original evaluation point. Lookup, conversion, error handling, and return behavior are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion for the opening declaration and original-point assignment.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 34 sources compiled; first stable blocker `mathmodule.c(1306)` C2143/C2065 for `double x`; later distinct blockers at `(1317)`, `(1335)`, `(1340)`, `(1926)`, `(3166)`, `(3505)`, and `(3582)`; summary `total=35 compiled=34 cached=0`. |
| `codex exec -s workspace-write --skip-git-repo-check ...` | exit 0; focused TDD implementation completed; the child reported the expected red assertion before the source edit and green focused test afterward; no commit/push/publish. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after the slice | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after the slice | exit 2; `math_ceil()` compiled past this family. The next first stable blocker is unavailable VC6 CRT `exp2` at `mathmodule.c(1336)`; `expm1` follows at `(1341)`, with later distinct declaration-order blockers. Summary `total=35 compiled=34 cached=0`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh` | exit 0; all applicable regression suites and shell syntax checks passed. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch && git -C cpython diff --check && cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; patch exactly matches the complete nested source diff. |

**Current compile-frontier state:** `math_ceil()` now compiles through its C89 declaration-order family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is the missing-CRT `exp2` family at `mathmodule.c(1336)`. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`mathmodule.c` guarded VC6 `cbrt` fallback slice)

Date: 2026-09-19 05:29 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. The nested `cpython/` checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. The verified MSVC6 banner remains `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86` through Wine using `WINEPREFIX=/home/ubuntu/.wine-win9xport`. `PORT_STATUS.md`, `README.md`, and `references/python-3-win9x-msvc6.md` were read before changes.

The recorded `_blake2/blake2s_impl.c` sequence was force-re-probed first and remained applicable: 34 sources compiled and `mathmodule.c` was first. The first stable blocker was unavailable VC6 CRT `cbrt` at the prior line 1259. One focused coding-agent delegation was attempted for implementation but failed before launch because the runtime lacks the `anthropic` package; no child files were used and no independent review is claimed. This slice addressed only `cbrt`.

- `cpython/Modules/mathmodule.c` — added an `_MSC_VER < 1300`-guarded `m_cbrt()` using `fabs`/`log`/`exp`, preserving NaN, signed zero, infinity, and sign handling; routed only `FUNC1(cbrt, ...)` through it. Native compilers retain the CRT path through `#define m_cbrt cbrt`.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion for the guarded fallback, special-value handling, native mapping, and routing.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 34 sources compiled; first stable diagnostic `mathmodule.c(1259)` C2065 for unavailable `cbrt`, followed by distinct declaration-order and `exp2`/`expm1` blockers; summary `total=35 compiled=34 cached=0 skipped=0`. |
| focused coding-agent delegation | failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child files were used and no independent review is claimed. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit | exit 1 as required by TDD; `VC6 m_cbrt fallback missing`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit | exit 2; `mathmodule.c` compiled past `cbrt`; next first stable blocker is `math_ceil()`'s post-statement `double x` declaration at `(1306)`, followed by distinct blockers at `(1317)`, `(1335)`, `(1340)`, `(1926)`, `(3166)`, `(3505)`, and `(3582)`; summary `total=35 compiled=34 cached=0 skipped=0`. Existing warnings remain `arraymodule.c(2247)`, `audioop.c(1536)`, `(1609)`, and `faulthandler.c(542)`. |
| `bash -n` plus public/core/PathCch/getpath/stdint/frontier regression suites | exit 0; all applicable suites passed and the focused frontier suite ended with `ALL TESTS PASSED`. |
| `git -C cpython diff --check`; patch regeneration plus `cmp -s` verification | exit 0; nested source diff is clean and the compatibility patch exactly matches the complete nested diff. |

**Current compile-frontier state:** `cbrt` now compiles through the guarded VC6 fallback under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is the distinct C89 declaration-order blocker in `math_ceil()` at `mathmodule.c(1306)`. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`mathmodule.c` guarded VC6 `atanh` fallback slice)

Date: 2026-09-19 03:21 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before changing anything, `PORT_STATUS.md`, `README.md`, and `references/python-3-win9x-msvc6.md` were read. The nested `cpython/` checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. The verified MSVC6 banner remains `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86` through Wine using `WINEPREFIX=/home/ubuntu/.wine-win9xport`.

The recorded frontier was force-re-probed first and remained applicable: `_blake2/blake2s_impl.c` compiled, 34 sources compiled, and `mathmodule.c` remained first. The first stable blocker was the distinct missing-VC6-CRT math-function family: `atanh` at line 1233 before this slice, followed by `cbrt` at line 1236 and later declaration-order families. One focused read-only Codex coding-agent delegation inspected this exact frontier, made no edits, and recommended the isolated `m_atanh` fallback. No independent implementation review is claimed beyond that advisory inspection.

This run addressed only `atanh`:

- `cpython/Modules/mathmodule.c` — added an `_MSC_VER < 1300`-guarded `m_atanh()` using the stable logarithmic formulation with small-input preservation, signed-zero/NaN handling, and `EDOM` for `abs(x) >= 1`; routed only `FUNC1(atanh, ...)` through it. Native compilers retain the CRT `atanh` path through `#define m_atanh atanh`.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion for the guarded fallback, native mapping, domain handling, and routing.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 34 sources compiled; first stable diagnostics `mathmodule.c(1233)` C2065 for `atanh`, then `cbrt` at `(1236)` and later distinct declaration-order blockers; summary `total=35 compiled=34 cached=0 skipped=0`. |
| focused read-only `codex exec -s read-only --skip-git-repo-check ...` | exit 0; recommended only the guarded `m_atanh` fallback and `FUNC1(atanh, m_atanh, 0, ...)`; no files changed, no broad build run. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit | exit 1 as required by TDD; `VC6 m_atanh fallback missing`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit | exit 2; `mathmodule.c` compiled past `atanh`; next first stable blocker is unavailable `cbrt` at `(1259)`; later distinct blockers remain at `(1288)`, `(1908)`, `(3148)`, `(3487)`, and `(3564)`; summary `total=35 compiled=34 cached=0 skipped=0`. Existing warnings remain `arraymodule.c(2247)`, `audioop.c(1536)`, `(1609)`, and `faulthandler.c(542)`. |
| `bash -n` plus public/core/PathCch/getpath/stdint/frontier regression suites | exit 0; all applicable suites passed and the focused frontier suite ended with `ALL TESTS PASSED`. |
| `git -C cpython diff --check`; patch regeneration plus `cmp -s` verification | exit 0; nested source diff is clean and the compatibility patch exactly matches the complete nested diff. |

**Current compile-frontier state:** `atanh` now compiles through the guarded VC6 fallback under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is the remaining missing-CRT `cbrt` family at `mathmodule.c(1259)`; `exp2` and `expm1` remain distinct later blockers. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`mathmodule.c` guarded VC6 `asinh` fallback slice)

Date: 2026-09-19 01:12 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before changing anything, `PORT_STATUS.md`, `README.md`, and `references/python-3-win9x-msvc6.md` were read. The nested `cpython/` checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. The verified MSVC6 banner remains `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86` through Wine using `WINEPREFIX=/home/ubuntu/.wine-win9xport`.

The recorded frontier was force-re-probed first and remained applicable: `_blake2/blake2s_impl.c` compiled, 34 sources compiled, and `mathmodule.c` remained first. The first stable blocker was the distinct missing-VC6-CRT math-function family, with `asinh` first at line 1212 before this slice. One focused coding-agent delegation was attempted for advisory inspection but failed before launch because the runtime lacks the `anthropic` package; no child files were used and no independent review is claimed. This run addressed only `asinh`; `atanh`, `cbrt`, `exp2`, `expm1`, and later declaration-order blockers remain untouched.

- `cpython/Modules/mathmodule.c` — added an `_MSC_VER < 1300`-guarded `m_asinh()` implementation using sign symmetry, a large-argument overflow-safe branch, and the standard logarithmic form; routed only `FUNC1(asinh, ...)` through it. Native CRT paths and later math functions remain unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion for the guarded fallback and explicit `m_asinh` routing.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 34 sources compiled; first stable diagnostics `mathmodule.c(1212)` C2065 for `asinh`, followed by `atanh` at `(1223)`, `cbrt` at `(1226)`, and later distinct families; summary `total=35 compiled=34 cached=0 skipped=0`. |
| focused coding-agent delegation | failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child files were used and no independent review is claimed. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit | exit 1 as required by TDD; `VC6 m_asinh fallback missing`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit | exit 2; `mathmodule.c` compiled past `asinh`; next first stable blockers are unavailable `atanh` at `(1233)` and `cbrt` at `(1236)`; summary `total=35 compiled=34 cached=0 skipped=0`. Existing warnings remain `arraymodule.c(2247)`, `audioop.c(1536)`, `(1609)`, and `faulthandler.c(542)`. |
| `bash -n` plus public/core/PathCch/getpath/stdint/frontier regression suites | exit 0; all applicable suites passed and the focused frontier suite ended with `ALL TESTS PASSED`. |
| `git -C cpython diff --check`; patch regeneration plus `cmp -s` verification | exit 0; nested source diff is clean and the compatibility patch exactly matches the complete nested diff. |

**Current compile-frontier state:** `asinh` now compiles through the guarded VC6 fallback under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is the remaining missing-CRT math family beginning with `atanh`; `cbrt`, `exp2`, and `expm1` remain distinct later blockers. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`mathmodule.c` guarded VC6 `acosh` fallback slice)

Date: 2026-09-18 23:05 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before changing anything, `PORT_STATUS.md`, `README.md`, and `references/python-3-win9x-msvc6.md` were read. The nested `cpython/` checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. The verified MSVC6 banner remains `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86` through Wine using `WINEPREFIX=/home/ubuntu/.wine-win9xport`.

The recorded frontier was force-re-probed first and remained applicable: `_blake2/blake2s_impl.c` compiled, 34 sources compiled, and `mathmodule.c` remained first. The first stable blocker was the distinct missing-VC6-CRT math-function family; `acosh` was the first error at line 1192 in the prior probe. One focused read-only Codex coding-agent delegation inspected this exact family, made no edits, and recommended a single guarded `m_acosh` fallback while leaving `asinh`, `atanh`, and `cbrt` for later slices. This run addressed only `acosh`.

- `cpython/Modules/mathmodule.c` — added an `_MSC_VER < 1300`-guarded `m_acosh()` implementation with domain-error handling and overflow-safe large-argument branch; routed only `FUNC1(acosh, ...)` through it. The native CRT paths and the later missing functions remain untouched.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion for the guarded fallback and explicit `m_acosh` routing.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 34 sources compiled; first blocker `mathmodule.c(1192)` C2065 for `acosh`, with later `asinh`, `atanh`, `cbrt`, `exp2`, `expm1`, and distinct declaration-order blockers; summary `total=35 compiled=34 cached=0 skipped=0`. |
| focused read-only `codex exec -s read-only --skip-git-repo-check ...` | exit 0; recommended only a guarded `m_acosh` fallback and `FUNC1(acosh, m_acosh, 0, ...)`; no files changed and no build run by the child. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit | exit 1 as required by TDD; `VC6 m_acosh fallback missing`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit | exit 2; `mathmodule.c` compiled past `acosh`; next first stable blockers are `asinh` at line 1212, `atanh` at 1223, and `cbrt` at 1226; summary `total=35 compiled=34 cached=0 skipped=0`. |
| `bash -n` plus public/core/PathCch/getpath/stdint regression suites | exit 0; all applicable suites passed. |
| `git -C cpython diff --check`; patch regeneration plus `cmp -s` verification | exit 0; nested source diff is clean and the compatibility patch exactly matches the complete nested diff. |

**Current compile-frontier state:** `acosh` now compiles through the guarded VC6 fallback under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is the remaining missing-CRT math family beginning with `asinh`; `atanh`, `cbrt`, `exp2`, and `expm1` remain distinct later blockers. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`mathmodule.c` `math_lcm` C89 declaration-order slice)

Date: 2026-09-18 20:56 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before changing anything, this file, `README.md`, and `references/python-3-win9x-msvc6.md` were read. The nested `cpython/` checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. The verified MSVC6 compiler remains `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86` through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`.

The recorded frontier was force-re-probed first and remained applicable: 34 sources compiled and `mathmodule.c` remained first. The first stable blocker was `math_lcm()`'s post-statement borrowed `zero` declaration at line 946. One focused read-only Codex delegation inspected this exact function, made no edits, and recommended hoisting only `zero` while preserving the assignment point. This slice addressed only that C89 declaration-order family; `mathmodule.c`'s later distinct blockers remain untouched.

- `cpython/Modules/mathmodule.c` — added `zero` to `math_lcm()`'s opening declaration group and changed its later declaration initializer to an assignment at the original point. Borrowed-reference ownership and loop behavior are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion for the declaration, assignment, and borrowed-reference shape.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 34 sources compiled; first stable blocker `mathmodule.c(946)` C2275/C2065 for `PyObject *zero`, followed by distinct blockers at `(1192)`, `(1242)`, `(1862)`, `(3102)`, `(3441)`, and `(3518)`; summary `total=35 compiled=34 cached=0 skipped=0`. |
| focused read-only `codex exec -s read-only --skip-git-repo-check ...` | exit 0; recommended moving `zero` into `PyObject *res, *x, *zero;` and assigning `zero = _PyLong_GetZero();`; no files changed and no build run by the child. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit | exit 1 as required by TDD; `math_lcm zero declaration missing from opening group`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit | exit 2; `math_lcm()` compiled past this defect family. The next first stable blocker is `mathmodule.c(1192)` C2065 for unavailable `acosh`; summary `total=35 compiled=34 cached=0 skipped=0`. Existing warnings remain `arraymodule.c(2247)`, `audioop.c(1536)`, `(1609)`, and `faulthandler.c(542)`. |
| `bash -n` on frontier scripts plus public/core/PathCch/getpath/stdint regression suites | exit 0; all applicable suites passed. |
| `git -C cpython diff --check`; patch regeneration plus `cmp -s` verification | exit 0; nested source diff is clean and the compatibility patch exactly matches the complete nested diff. |

**Current compile-frontier state:** `math_lcm()` now compiles past its borrowed-local C89 declaration-order family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is the distinct `mathmodule.c(1192)` missing-`acosh` family. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`mathmodule.c` `math_gcd` C89 declaration-order slice)

Date: 2026-09-18 18:48 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. The nested `cpython/` checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains an external/local-only prerequisite through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified compiler is `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded `_blake2/blake2s_impl.c` sequence was force-re-probed first, but the recorded `itertoolsmodule.c` frontier was no longer current: the actual first stable blocker was `mathmodule.c`. The first defect family was `math_gcd()`'s post-statement borrowed singleton declaration at line 871. One focused read-only Codex delegation inspected this exact function, made no edits, and recommended hoisting only `one` while preserving the assignment point. This slice addressed only that C89 declaration-order family.

- `cpython/Modules/mathmodule.c` — added `one` to `math_gcd()`'s opening declaration group and changed its later declaration initializer to an assignment at the original point. Borrowed-reference handling, early returns, and loop behavior are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion for the declaration and assignment shape.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 34 sources compiled; first stable blocker `mathmodule.c(871)` C2275/C2065 for `PyObject *one`, followed by distinct blockers at `(946)`, `(1192)`, `(1242)`, `(1862)`, `(3102)`, `(3441)`, and `(3518)`; summary `total=35 compiled=34 cached=0 skipped=0`. |
| focused read-only `codex exec -s read-only --skip-git-repo-check ...` | exit 0; recommended moving `one` into `PyObject *res, *x, *one;` and assigning `one = _PyLong_GetOne();`; no files changed and no build run by the child. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit | exit 1 as required by TDD; `math_gcd one declaration missing from opening group`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit | exit 2; `math_gcd()` compiled past this defect family. The next first stable blocker is `mathmodule.c(946)` C2275/C2065 for `math_lcm()`'s distinct post-statement `zero` declaration; summary `total=35 compiled=34 cached=0 skipped=0`. Existing warnings remain `arraymodule.c(2247)`, `audioop.c(1536)`, `(1609)`, and `faulthandler.c(542)`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh`, public/core/PathCch/getpath/stdint/frontier regression suites, `git -C cpython diff --check`, and patch `cmp -s` verification | exit 0; all applicable checks passed and the compatibility patch exactly matches the complete nested source diff. |

**Current compile-frontier state:** `math_gcd()` now compiles past its C89 declaration-order family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is `math_lcm()` at `mathmodule.c(946)`, beginning with its distinct borrowed `zero` declaration. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`gcmodule.c` duplicate declaration slice)

Date: 2026-09-18 16:40 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. The nested `cpython/` checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains an external/local-only prerequisite through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified compiler is `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded `_blake2/blake2s_impl.c` sequence was force-re-probed first and remained applicable: 30 sources compiled, including `faulthandler.c` and `gcmodule.c`. The first stable `gcmodule.c` diagnostic was a duplicate `PyGC_Head *gc, *next` declaration in `clear_unreachable_mask()` at lines 707 and 711. A focused coding-agent delegation was attempted for advisory inspection but failed before launch because the runtime lacks the `anthropic` package; no child files were used and no independent review is claimed. This slice addressed only that duplicate-declaration family.

- `cpython/Modules/gcmodule.c` — removed the second, redundant `PyGC_Head *gc, *next` declaration from `clear_unreachable_mask()`. The declaration group and control flow are otherwise unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion requiring exactly one declaration of the local pair.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; summary `total=31 compiled=30 cached=0 skipped=0`; first stable diagnostics were `gcmodule.c(711)` C2143, followed by distinct diagnostics at `(1065)`, `(1180)`, and `(1293)`. |
| focused coding-agent delegation | failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child files were used and no independent review is claimed. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit | exit 1 as required by TDD; `clear_unreachable_mask duplicate local declaration`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit | exit 2; `gcmodule.c` compiled past the duplicate declaration. Existing warnings remain `arraymodule.c(2247)`, `audioop.c(1536)`, `(1609)`, and `faulthandler.c(542)`. The next first stable blocker is `cpython/Modules/itertoolsmodule.c`, with C2275/C2065 at line 883 and C2143/C2065/C2059 loop-declaration diagnostics at line 4878; summary `total=33 compiled=32 cached=0 skipped=0`. |
| full applicable regression suites and shell syntax checks | exit 0; public/core/PathCch/getpath/stdint/frontier suites all passed. |
| `git -C cpython diff --check`; patch regeneration plus `cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; nested source diff is clean and the compatibility patch exactly matches the complete nested diff. |

**Current compile-frontier state:** `gcmodule.c` now compiles past its duplicate-local declaration family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is `itertoolsmodule.c` at line 883, beginning with its post-statement `PyObject *dataobj` declaration; the later C99 loop family at line 4878 is distinct. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`faulthandler.c` VC6 declaration/API compatibility slices)

Date: 2026-09-18 16:03 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. The nested `cpython/` checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains an external/local-only prerequisite through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`.

This continuation cleared the remaining reported `faulthandler.c` compile errors without changing its core control flow:

- Converted Windows exception-handler, traceback, disable-loop, and SIGFPE locals to VC6/C89 declaration order.
- Guarded abort behavior flags unavailable in the MSVC6 CRT.
- Replaced the `Py_FatalError` use that expands through unsupported `__func__` with an explicit `_Py_FatalErrorFunc` call.
- Replaced the `faulthandler` module's designated initializer with positional fields.
- Hoisted `faulthandler_init_enable()` locals.

**Exact verified result:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | exit 2; summary `total=31 compiled=30 cached=0 skipped=0` |
| Current first blocker | `cpython/Modules/gcmodule.c` |

The next file contains many independent C89 declaration-order and control-flow failures, including errors around lines 1456, 1530, 1600, 1681, 1686, and 1714. No speculative broad edit was made.

This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`_datetime_exec`, datetime module definition, and errno VC6 slice)

Date: 2026-09-18 15:44 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. The nested `cpython/` checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains an external/local-only prerequisite through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`.

This slice advanced the real pythoncore compile frontier from 27 to 29 compiled sources. It addressed only bounded VC6 compatibility families:

- `cpython/Modules/_datetimemodule.c`: hoisted all `_datetime_exec()` locals before executable statements, preserved initializer/evaluation order, and replaced the module definition's C99 designated initializer with declared-order positional fields.
- `cpython/Modules/errnomodule.c`: converted `_add_errcode()` and `errno_exec()` mixed declarations to C89 declaration order and replaced `errnomodule`'s designated module initializer with positional fields.
- `scripts/vc6-probe-pythoncore-frontier.test.sh`: added regression coverage for `_datetime_exec()`'s declaration family.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch`: must be regenerated from the complete nested diff after this status update.

**Exact verified results:**

| Command | Result |
|---|---|
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` | exit 0; `ALL TESTS PASSED` |
| `bash -n` on frontier scripts plus existing probe/core/pathcch/getpath/stdint regression suites | exit 0; all applicable suites passed |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | exit 2; summary `total=30 compiled=29 cached=0 skipped=0` |
| Current first blocker | `cpython/Modules/faulthandler.c` |

The next file is not a single narrow defect: the probe reports multiple independent MSVC6/Win9x issues in `faulthandler.c`, including C99 loop/mixed declarations, missing `_WRITE_ABORT_MSG` and `_CALL_REPORTFAULT`, missing `__func__`, volatile/declaration syntax failures, and a designated initializer at line 1335. No speculative broad edit was made.

This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`datetime_fromisoformat` C89 declaration-order slice)

Date: 2026-09-18 14:34 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before changing anything, `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` were read. The nested `cpython/` checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains an external/local-only prerequisite through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified compiler banner remains `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded `_blake2/blake2s_impl.c` sequence was force-re-probed first and remained applicable: `_blake2/blake2s_impl.c` compiled successfully, 27 sources compiled, and `_datetimemodule.c` remained first. The first stable diagnostics were `_datetimemodule.c(5518)` C2275/C2065 for `datetime_fromisoformat()`'s post-statement `dtstr_clean` declaration, followed by its same-function declaration-order cascades. One focused read-only Codex coding-agent delegation inspected this exact function and recommended hoisting all function-scope locals while preserving each initializer's original execution point; it exited 0, made no file changes, and ran no builds. This run addressed only that declaration-order family.

- `cpython/Modules/_datetimemodule.c` — hoisted `datetime_fromisoformat()`'s locals into its opening declaration group and changed initialized declarations to assignments at their original execution points. Sanitization, UTF-8 conversion, separator detection, parsing, cleanup labels, reference counting, and return behavior are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion requiring the C89-safe declaration group, original-point assignments, and rejection of mixed declarations.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; `_blake2/blake2s_impl.c` compiled, 27 sources compiled, and first stable diagnostics were `_datetimemodule.c(5518)` C2275/C2065 for `dtstr_clean`; summary `total=28 compiled=27 cached=0 skipped=0`. |
| focused read-only `codex exec -s read-only --skip-git-repo-check ...` | exit 0; recommended the minimal `datetime_fromisoformat()` hoist and original-point assignments; no files changed and no builds run by the child. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit | exit 1 as required by TDD; `datetime_fromisoformat declaration missing from opening group: PyObject *dtstr_clean;`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit | exit 2; `datetime_fromisoformat()` compiled past this family. The next first stable diagnostics are `_datetimemodule.c(6814)` C2275/C2065/C2059 for `_datetime_exec()`'s post-statement `PyTypeObject *types[]` declaration, followed by its C99 loop declaration; later distinct mixed declarations remain at `(6847)` and `(6875)`, and a designated initializer remains at `(7013)`. Summary `total=28 compiled=27 cached=0 skipped=0`. Existing C4761 warnings remain in `arraymodule.c(2247)` and `audioop.c(1536)`, `(1609)`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh` | exit 0; all applicable regression suites and shell syntax checks passed; the focused frontier suite ended with `ALL TESTS PASSED`. |
| `git -C cpython diff --check`; `cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; source diff is clean and the compatibility patch exactly matches the nested source diff. |

**Current compile-frontier state:** `datetime_fromisoformat()` now compiles past its C89 declaration-order family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is `_datetime_exec()` at `_datetimemodule.c(6814)`, beginning with the `types[]` declaration after executable statements. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`_datetimemodule.c` VC6 64-bit spelling/literal-suffix slice)

Date: 2026-09-18 10:17 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before changing anything, `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` were read. The nested `cpython/` checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains an external/local-only prerequisite through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified compiler banner remains `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded frontier was force-re-probed first and remained applicable: `_blake2/blake2s_impl.c` compiled successfully, 27 sources compiled, and `_datetimemodule.c` remained first. The first stable diagnostics were the distinct VC6 `long long`/C99 literal-suffix family at `_datetimemodule.c(5053)`–`(5074)`, followed by later declaration-order diagnostics. The required focused coding-agent delegation was attempted but could not launch because the runtime lacks the `anthropic` package; no child changes or independent review are claimed. This run addressed only the 64-bit spelling/literal-suffix family.

- `cpython/Modules/_datetimemodule.c` — replaced this file's `long long` declarations with CPython's `PY_LONG_LONG` abstraction and its `LL` epoch literals with `PY_LL(719163)`. Arithmetic, ranges, control flow, and API behavior are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion rejecting `long long`/`719163LL` and requiring `PY_LONG_LONG`/`PY_LL`.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; `_blake2/blake2s_impl.c` compiled, 27 sources compiled, and first stable diagnostics were `_datetimemodule.c(5053)`–`(5057)` C2632/C2059/C2146/C2143 for `long long` and `LL`, with later cascades; summary `total=28 compiled=27 cached=0 skipped=0`. |
| focused coding-agent delegation | failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child files were used and no independent review is claimed. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit | exit 1 as required by TDD; `_datetimemodule long long keyword remains`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit | exit 2; `_datetimemodule.c` compiled past the 64-bit spelling/literal-suffix family. The next first stable diagnostics are `_datetimemodule.c(5355)`/`(5356)` C2143 declaration-order errors; summary `total=28 compiled=27 cached=0 skipped=0`. Existing C4761 warnings remain in `arraymodule.c(2247)` and `audioop.c(1536)`, `(1609)`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check` | exit 0; all applicable regression suites, source checks, and nested source diff checks passed. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch`; `cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; compatibility patch regenerated and exactly matches the complete nested source diff. |

**Current compile-frontier state:** `_datetimemodule.c` now compiles past its VC6 `long long`/literal-suffix family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is the distinct C89 declaration-order family beginning at `_datetimemodule.c(5355)`. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`_datetimemodule.c` `time_fromisoformat` C89 declaration-order slice)

Date: 2026-09-18 08:10 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before changing anything, `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` were read. The nested `cpython/` checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains an external/local-only prerequisite through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified compiler banner remains `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded frontier was force-re-probed first and remained applicable: `_blake2/blake2s_impl.c` compiled successfully, 27 sources compiled, and `_datetimemodule.c` remained first. The first stable diagnostics were `_datetimemodule.c(4699)` C2275/C2146/C2065 for `time_fromisoformat()`'s post-statement `Py_ssize_t len` declaration, followed by the same function's later locals. One focused read-only Codex coding-agent delegation inspected this exact function and recommended hoisting `len`, `p`, the integer locals, `tzinfo`, and `t` while preserving each initializer's original execution point; it made no file changes and ran no builds. This run addressed only that declaration-order family.

- `cpython/Modules/_datetimemodule.c` — hoisted `time_fromisoformat()` locals into its opening declaration group and changed the UTF-8 conversion, zero initialization, parser call, and timezone construction declarations into assignments at their original execution points. Parsing, error labels, reference counting, and return behavior are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion requiring the C89-safe declarations and assignment sequence.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; `_blake2/blake2s_impl.c` compiled, 27 sources compiled, and first stable diagnostic `_datetimemodule.c(4699) C2275/C2146/C2065` for `Py_ssize_t len`; summary `total=28 compiled=27 cached=0 skipped=0`. |
| focused read-only `codex exec -s read-only --skip-git-repo-check ...` | exit 0; recommended the minimal `time_fromisoformat()` declaration hoist and original-point assignments; no files changed and no builds run by the child. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit | exit 1 as required by TDD; `time_fromisoformat declaration missing from opening group: Py_ssize_t len;`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit | exit 2; `time_fromisoformat()` compiled past this declaration-order family. The next first stable diagnostics are the distinct `long long`/literal-suffix family at `_datetimemodule.c(5053)`–`(5057)`; summary `total=28 compiled=27 cached=0 skipped=0`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check` | exit 0; all applicable regression suites, source checks, and nested source diff checks passed. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch`; `cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; compatibility patch regenerated and exactly matches the complete nested source diff. |

**Current compile-frontier state:** `time_fromisoformat()` now compiles past its C89 declaration-order family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is the distinct `_datetimemodule.c(5053)` `long long`/integer-literal-suffix family. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`_datetimemodule.c` `date_isocalendar` C89 result-local slice)

Date: 2026-09-18 06:02 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before changing anything, `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` were read. The nested `cpython/` checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains an external/local-only prerequisite through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified compiler banner remains `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded `_blake2/blake2s_impl.c` sequence was force-re-probed first and remained applicable: 27 sources compiled, with `_datetimemodule.c` still first. The first stable diagnostics were `_datetimemodule.c(3513) C2275/C2065` for `date_isocalendar()`'s post-statement `PyObject* v` declaration. One focused coding-agent delegation was attempted as required but failed before launch because the runtime lacks the `anthropic` package; no child files were used and no independent review is claimed. This run addressed only that C89 declaration-order family.

- `cpython/Modules/_datetimemodule.c` — hoisted `PyObject* v` into `date_isocalendar()`'s opening declaration group and changed only the constructor declaration initializer to an assignment at the original call site. ISO calendar calculation, NULL handling, and return behavior are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion requiring the opening declaration and constructor assignment.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 27 sources compiled; first stable diagnostics `_datetimemodule.c(3513) C2275/C2065` for `PyObject* v`; summary `total=28 compiled=27 cached=0 skipped=0`. Existing warnings remained at `arraymodule.c(2247)` and `audioop.c(1536)`, `(1609)` C4761. |
| focused coding-agent delegation | failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child files were used and no independent review is claimed. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit | exit 1 as required by TDD; `date_isocalendar v declaration missing from opening group`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit | exit 2; `date_isocalendar()` compiled past this defect family. The next first stable diagnostics are `_datetimemodule.c(4699)` C2275/C2146/C2065 for a distinct declaration-order family; summary `total=28 compiled=27 cached=0 skipped=0`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check` | exit 0; all applicable regression suites and source checks passed. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch`; `cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; compatibility patch regenerated and exactly matches the complete nested source diff. |

**Current compile-frontier state:** `date_isocalendar()` now compiles past its C89 declaration-order family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is `_datetimemodule.c(4699)`, a distinct declaration-order family. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`_datetimemodule.c` `PyDateTime_IsoCalendarDateType` positional-initializer slice)

Date: 2026-09-18 03:54 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before changing anything, `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` were read. The nested `cpython/` checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. The existing modifications to `scripts/vc6-probe-pythoncore-frontier.sh` and all prior CPython edits were preserved. MSVC6 remains an external/local-only prerequisite through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified compiler banner remains `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded frontier was force-re-probed first and remained applicable: `_blake2/blake2s_impl.c` compiled successfully, 27 sources compiled, and `_datetimemodule.c` remained first. The first stable diagnostic was `_datetimemodule.c(3426) C2059: syntax error '.'` from the designated `PyTypeObject` initializer for `PyDateTime_IsoCalendarDateType`. One focused coding-agent delegation was attempted for advisory inspection but failed before launch because the runtime lacks the `anthropic` package; no child files were used and no independent review is claimed. This run addressed only that designated-initializer family.

- `cpython/Modules/_datetimemodule.c` — replaced only `PyDateTime_IsoCalendarDateType`'s C99 designated fields with declared-order positional `PyTypeObject` fields, matching the already-portable datetime type definitions. The type name, size, repr, flags, documentation, methods, getset, and constructor values are unchanged; previously implicit fields remain zero/NULL.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion requiring the exact positional initializer.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; `_blake2/blake2s_impl.c` compiled, 27 sources compiled, and first stable diagnostic `_datetimemodule.c(3426) C2059` for the designated initializer; summary `total=28 compiled=27 cached=0 skipped=0`. |
| focused coding-agent delegation | failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child files were used and no independent review is claimed. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit | exit 1 as required by TDD; `iso calendar date type positional initializer mismatch`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit | exit 2; the designated-initializer blocker cleared and the next first stable diagnostic is `_datetimemodule.c(3513) C2275/C2065` for `PyObject* v` in `date_isocalendar()`; summary `total=28 compiled=27 cached=0 skipped=0`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check` | exit 0; all applicable regression suites and source checks passed. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch`; `cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; compatibility patch regenerated and exactly matches the complete nested source diff. |

**Current compile-frontier state:** `PyDateTime_IsoCalendarDateType` now compiles past its C99 designated-initializer family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is the distinct post-statement `PyObject* v` declaration in `date_isocalendar()` at `_datetimemodule.c(3513)`. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`_datetimemodule.c` `iso_calendar_date_repr` C89 declaration-order slice)

Date: 2026-09-18 01:43 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before changing anything, `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` were read. The nested `cpython/` checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains an external/local-only prerequisite through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified compiler banner remains `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded frontier was force-re-probed first and remained applicable: `_blake2/blake2s_impl.c` compiled successfully, 27 sources compiled, and `_datetimemodule.c` remained first. The first stable diagnostics were `_datetimemodule.c(3349)`/`(3353)` C2275/C2065 for `iso_calendar_date_repr()`'s post-statement `week`/`weekday` declarations. One focused read-only Codex delegation inspected this exact function and recommended hoisting those two declarations while preserving the lookup and NULL-check sequence; it made no file changes and ran no builds. This run addressed only that declaration-order family.

- `cpython/Modules/_datetimemodule.c` — hoisted `PyObject* week` and `PyObject* weekday` into `iso_calendar_date_repr()`'s opening declaration group and changed their initializers to assignments at the original evaluation points. Lookup order, NULL checks, and formatting behavior are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion requiring the C89-safe declaration and assignment shape.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; `_blake2/blake2s_impl.c` compiled, 27 sources compiled, and first stable diagnostics were `_datetimemodule.c(3349)`/`(3353)` C2275/C2065 for `week`/`weekday`; summary `total=28 compiled=27 cached=0 skipped=0`. |
| focused read-only `codex exec -s read-only --skip-git-repo-check ...` | exit 0; recommended opening declarations for `week`/`weekday` and assignments at their original lookup points; no files changed and no builds run by the child. No independent review is claimed. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit | exit 1 as required by TDD; `iso_calendar_date_repr declaration missing from opening group: PyObject* week;`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit | exit 2; `iso_calendar_date_repr()` compiled past this defect family. The next first stable diagnostic is `_datetimemodule.c(3426) C2059` for the distinct designated initializer in `PyDateTime_IsoCalendarDateType`; summary `total=28 compiled=27 cached=0 skipped=0`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check && git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch && git -C cpython diff --check` | exit 0; all applicable regression suites, source checks, and patch regeneration passed. |

**Current compile-frontier state:** `iso_calendar_date_repr()` now compiles past its `week`/`weekday` C89 declaration-order family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is the distinct designated initializer in `PyDateTime_IsoCalendarDateType` at `_datetimemodule.c(3426)`. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`_datetimemodule.c` `date_fromisocalendar` C89 declaration-order slice)

Date: 2026-09-17 23:34 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before changing anything, `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` were read. The nested `cpython/` checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains an external/local-only prerequisite through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified compiler banner remains `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded frontier was force-re-probed first and remained applicable: `_blake2/blake2s_impl.c` compiled successfully, 27 sources compiled, and `_datetimemodule.c` remained first. The first stable diagnostics were `_datetimemodule.c(3152)`/`(3153)` C2143 for `date_fromisocalendar()`'s post-statement `month`/`rv` declarations. One focused read-only Codex delegation inspected this exact function and recommended hoisting the declarations while preserving the conversion call's execution point; no child files were changed and no independent review is claimed. This run addressed only that declaration-order family.

- `cpython/Modules/_datetimemodule.c` — hoisted `int month` and `int rv` into `date_fromisocalendar()`'s opening declaration group and changed `int rv = iso_to_ymd(...)` to `rv = iso_to_ymd(...)` at the original evaluation point. The conversion call, error handling, and return behavior are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion requiring the C89-safe declaration and assignment shape.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 27 sources compiled, including `_blake2/blake2s_impl.c`; first stable diagnostics `_datetimemodule.c(3152)`/`(3153)` C2143 and `(3156)`/`(3167)` cascades for `rv`/`month`; summary `total=28 compiled=27 cached=0 skipped=0`. |
| focused read-only `codex exec -s read-only --skip-git-repo-check ...` | exit 0; recommended opening declarations `int month; int rv;` and assignment `rv = iso_to_ymd(...)`; no files changed and no tests run by the child. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit | exit 1 as required by TDD; `date_fromisocalendar declaration missing from opening group: int month;`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit | exit 2; `date_fromisocalendar()` compiled past this defect family. The next first stable diagnostics are `_datetimemodule.c(3349)`/`(3353)` C2275/C2065 for `iso_calendar_date_repr()`'s post-statement `week`/`weekday` declarations; summary `total=28 compiled=27 cached=0`. |
| applicable regression suites and source checks | exit 0; shell syntax, public/core/PathCch/getpath/stdint/frontier suites and nested `git -C cpython diff --check` all passed. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; compatibility patch regenerated. |

**Current compile-frontier state:** `date_fromisocalendar()` now compiles past its C89 declaration-order family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is `iso_calendar_date_repr()` at `_datetimemodule.c(3349)`/`(3353)`, beginning with `week`/`weekday`. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`_datetimemodule.c` `date_fromisoformat` C89 declaration-order slice)

Date: 2026-09-17 21:27 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before changing anything, `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` were read. The nested `cpython/` checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains an external/local-only prerequisite through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified compiler banner remains `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded frontier was force-re-probed first and remained applicable: `_blake2/blake2s_impl.c` compiled successfully, 27 sources compiled, and `_datetimemodule.c` remained first. The first stable diagnostics were `_datetimemodule.c(3095)` for `date_fromisoformat()` declarations after executable statements. One focused Codex delegation was attempted in an isolated snapshot but failed before launch because the snapshot copy hit `Disk quota exceeded`; no child files were used and no independent review is claimed. This run addressed only the `date_fromisoformat()` declaration-order family.

- `cpython/Modules/_datetimemodule.c` — hoisted `len`, `dt_ptr`, `year`, `month`, `day`, and `rv` into `date_fromisoformat()`'s opening declaration group. Changed `dt_ptr` and date-local initialization to assignments at their original evaluation sequence; parsing, error handling, and return behavior are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion requiring the C89-safe declaration and assignment shape.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 27 sources compiled, including `_blake2/blake2s_impl.c`; first stable diagnostics `_datetimemodule.c(3095)` C2275/C2146/C2065 for `Py_ssize_t len`, followed by the distinct later declaration families; summary `total=28 compiled=27 cached=0 skipped=0`. |
| focused Codex delegation | exit 1 before launch: isolated snapshot copy failed with `Disk quota exceeded`; no child files were used and no independent review is claimed. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit | exit 1 as required by TDD; `date_fromisoformat declaration missing from opening group: Py_ssize_t len;`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit | exit 2; `date_fromisoformat()` compiled past this defect family. The next first stable diagnostics are `_datetimemodule.c(3152)`/`(3153)` C2143 and `(3156)` C2065 for the distinct `date_fromisocalendar()` declaration family; summary `total=28 compiled=27 cached=0 skipped=0`. |
| applicable regression suites and source checks | exit 0; shell syntax, public/core/PathCch/getpath/stdint/frontier suites and nested `git -C cpython diff --check` all passed. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch` plus diff check | exit 0; compatibility patch regenerated and nested source diff is clean. |
| pristine detached nested `cpython` worktree at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549` plus `git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; patch applies cleanly; temporary verification worktree removed. |

**Current compile-frontier state:** `date_fromisoformat()` now compiles past its C89 declaration-order family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is `date_fromisocalendar()` at `_datetimemodule.c(3152)`/`(3153)`, beginning with its post-statement `month`/`rv` declarations. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`_datetimemodule.c` `delta_repr` C89 declaration-order slice)

Date: 2026-09-17 19:20 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before changing anything, `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` were read. The nested `cpython/` checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains an external/local-only prerequisite through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified compiler banner remains `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded frontier was force-re-probed first and remained applicable: 27 sources compiled, including `_blake2/blake2s_impl.c`, and `_datetimemodule.c` remained first. The first stable diagnostics were `_datetimemodule.c(2663)`/`(2670)` for `delta_repr()`'s post-statement `sep` declaration, with a later `repr` declaration at `(2697)`. One focused coding-agent delegation was attempted but failed before launch because the runtime lacks the `anthropic` package; no child files or independent review are claimed. This run addressed only the `delta_repr()` declaration-order family.

- `cpython/Modules/_datetimemodule.c` — hoisted `const char *sep` and `PyObject *repr` into `delta_repr()`'s opening declaration group; changed their initializers to assignments at the original evaluation points. Formatting, reference counting, and return behavior are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion requiring the C89-safe `delta_repr()` declaration and assignment shape.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 27 sources compiled, including `_blake2/blake2s_impl.c`; first stable diagnostics `_datetimemodule.c(2663)`/`(2670)` C2143/C2065 for `sep`; summary `total=28 compiled=27 cached=0 skipped=0`. |
| focused coding-agent delegation | failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child files were used and no independent review is claimed. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit | exit 1 as required by TDD; `delta_repr declaration missing from opening group: const char *sep;`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit | exit 2; `delta_repr()` compiled past this defect family. The next first stable diagnostics are `_datetimemodule.c(3095)` C2275/C2146/C2065 for a distinct declaration-order family; summary `total=28 compiled=27 cached=0 skipped=0`. |
| applicable regression suites and source checks | exit 0; shell syntax, public/core/PathCch/getpath/stdint/frontier suites and nested `git -C cpython diff --check` all passed. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; compatibility patch regenerated and nested source diff is clean. |
| pristine detached nested `cpython` worktree at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549` plus `git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; patch applies cleanly; temporary verification worktree removed. |

**Current compile-frontier state:** `delta_repr()` now compiles past its C89 declaration-order family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is `_datetimemodule.c(3095)`, beginning with a distinct declaration-order family. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`_datetimemodule.c` `tzinfo_from_isoformat_results` C89 declaration-order slice)

Date: 2026-09-17 17:13 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Before changing anything, `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` were read. The nested `cpython/` checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains an external/local-only prerequisite through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified compiler banner remains `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded frontier was force-re-probed first and remained applicable: 27 sources compiled, including `_blake2/blake2s_impl.c`, and `_datetimemodule.c` was first. The first stable diagnostic was `_datetimemodule.c(1435)` for `tzinfo_from_isoformat_results()`'s post-statement `PyObject *delta` declaration. One focused coding-agent delegation was attempted but failed before launch because the runtime lacks the `anthropic` package; no child files or independent review are claimed. This run addressed only that declaration-order family.

- `cpython/Modules/_datetimemodule.c` — hoisted `PyObject *delta` into `tzinfo_from_isoformat_results()`'s opening declaration group and changed its initializer to an assignment at the original evaluation point. Timezone construction, reference counting, error handling, and return behavior are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion requiring the C89-safe declaration and assignment shape.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 27 sources compiled; first stable diagnostic `_datetimemodule.c(1435) C2275/C2065` for `PyObject *delta`; later cascades included distinct declaration and legacy-integer families; summary `total=28 compiled=27 cached=0 skipped=0`. |
| focused coding-agent delegation | failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child files were used and no independent review is claimed. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit | exit 1 as required by TDD; `tzinfo_from_isoformat_results delta declaration missing from opening group`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit | exit 2; `tzinfo_from_isoformat_results()` compiled past this defect family. The next first stable diagnostics are `_datetimemodule.c(2663)`/`(2670)` for `sep` in a distinct declaration-order family; summary `total=28 compiled=27 cached=0 skipped=0`. |
| applicable regression tests and source checks | exit 0; shell syntax, public/core/PathCch/getpath/stdint/frontier suites and nested `git -C cpython diff --check` all passed. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch` plus patch check | exit 0; compatibility patch regenerated and nested source diff is clean. |
| pristine detached nested `cpython` worktree at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549` plus `git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; patch applies cleanly; temporary verification worktree removed. |

**Current compile-frontier state:** `tzinfo_from_isoformat_results()` now compiles past its C89 declaration-order family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is `_datetimemodule.c(2663)`/`(2670)`, beginning with `sep`. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`_datetimemodule.c` `parse_hh_mm_ss_ff` C89 declaration-order slice)

Date: 2026-09-17 12:59 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`. Before changing anything, `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` were read. The nested `cpython/` checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains an external/local-only prerequisite through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified compiler banner remains `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded `_datetimemodule.c` frontier was force-re-probed first and remained applicable: 27 sources compiled, including `_blake2/blake2s_impl.c`, and `parse_hh_mm_ss_ff()` was first. The first stable diagnostics were C2143 declaration-order errors at `_datetimemodule.c(822)`–`(829)`, with cascades from its post-statement locals, C99 loop declaration, and later declarations. One focused read-only Codex coding-agent lane inspected this exact function and recommended the minimal behavior-preserving C89 transformation; it made no file changes and ran no build. No independent review is claimed.

- `cpython/Modules/_datetimemodule.c` — hoisted `parse_hh_mm_ss_ff()` locals and its static correction table, replaced the nonconstant `vals` initializer with assignments, changed the loop counter and character local to C89 declaration/assignment forms, and changed fractional locals to assignments. Parsing order and return behavior are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion for the exact C89-safe `parse_hh_mm_ss_ff()` shape.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 27 sources compiled; first stable diagnostics `_datetimemodule.c(822)`/`(823)` C2143, followed by `(824)`, `(826)`, and `(829)` declaration/loop cascades; summary `total=28 compiled=27 cached=0 skipped=0`. |
| focused read-only Codex delegation | exit 0; recommended hoisting `p`, `p_end`, `vals`, `has_separator`, `i`, `len_remains`, `to_parse`, and `correction`, explicit `vals` assignments, C89 loop/local forms, and fractional assignments; no files changed and no child build run. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit | exit 1 as required by TDD; `parse_hh_mm_ss_ff declaration missing from opening group: int *vals[3];`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit | exit 2; `parse_hh_mm_ss_ff()` compiled past its defect family. Existing warnings remain `arraymodule.c(2247)` and `audioop.c(1536)`, `(1609)` C4761. The next first stable diagnostics are `_datetimemodule.c(914)`/`(917)` for `parse_isoformat_time()`'s post-statement `rv`; summary `total=28 compiled=27 cached=0 skipped=0`. |
| applicable regression suites and source checks | exit 0; shell syntax, public/core/PathCch/getpath/stdint/frontier suites and nested `git -C cpython diff --check` all passed. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch` plus patch check | exit 0; compatibility patch regenerated and nested source diff is clean. |
| pristine detached nested `cpython` checkout at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549` plus `git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; patch applies cleanly; temporary worktree removed. |

**Current compile-frontier state:** `parse_hh_mm_ss_ff()` now compiles past its C89 declaration-order family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is `parse_isoformat_time()` at `_datetimemodule.c(914)`, beginning with its `rv` declaration after executable statements. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`_datetimemodule.c` `parse_isoformat_date` `rv` C89 slice)

Date: 2026-09-17 10:50 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`. Before changing anything, `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` were read. The nested `cpython/` checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains an external/local-only prerequisite through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified compiler banner remains `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded frontier was force-re-probed first and remained applicable: 27 sources compiled, including `_blake2/blake2s_impl.c`, and `_datetimemodule.c` was first. The first stable diagnostics were `_datetimemodule.c(793)`/`(794)` C2143/C2065 for the distinct `rv` declaration in `parse_isoformat_date()`. One focused coding-agent delegation was attempted as required but failed before launch because the runtime lacks the `anthropic` package; no child changes or independent review are claimed. This run addressed only the `rv` declaration-order family.

- `cpython/Modules/_datetimemodule.c` — hoisted `int rv` into `parse_isoformat_date()`'s opening declaration group and changed only its original initializer to an assignment immediately before `if (rv)`. ISO-week conversion and return behavior are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion requiring the C89-safe `rv` declaration/assignment shape.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

|| Command | Result |
||---|---|
|| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 27 sources compiled; first stable diagnostics `_datetimemodule.c(793)`/`(794)` C2143/C2065 for `rv`; summary `total=28 compiled=27 cached=0 skipped=0`. |
|| focused coding-agent delegation | failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child files were used and no independent review is claimed. |
|| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit | exit 1 as required by TDD; `parse_isoformat_date rv declaration missing from opening group`. |
|| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | exit 0; `ALL TESTS PASSED`. |
|| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit | exit 2; `_datetimemodule.c` compiled past the `rv` family. The next first stable diagnostics are `(822)`/`(823)` C2143 for `parse_hh_mm_ss_ff()` declarations; summary `total=28 compiled=27 cached=0 skipped=0`. |
|| applicable regression suites and source checks | exit 0; shell syntax, public/core/PathCch/getpath/stdint/frontier suites and nested `git -C cpython diff --check` all passed. |
|| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch` plus patch check | exit 0; compatibility patch regenerated and nested source diff is clean. |
|| pristine detached nested `cpython` checkout at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549` plus `git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; patch applies cleanly; temporary worktree removed. |

**Current compile-frontier state:** `parse_isoformat_date()` now compiles past its `rv` C89 declaration-order family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is the distinct `parse_hh_mm_ss_ff()` declaration-order family at `_datetimemodule.c(822)`/`(823)`. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`_datetimemodule.c` `parse_isoformat_date` ISO-week locals C89 slice)

Date: 2026-09-17 08:44 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`. Before changing anything, `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` were read. The nested `cpython/` checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains an external/local-only prerequisite through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified compiler banner remains `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded frontier was force-re-probed first and remained applicable: 27 sources compiled, including `_blake2/blake2s_impl.c`, and `_datetimemodule.c` was first. The first stable diagnostics were `_datetimemodule.c(769)`/`(770)` C2143 for `iso_week`/`iso_day`, followed by a distinct `rv` declaration at `(791)`. One focused coding-agent delegation was attempted as required but failed before launch because the runtime lacks the `anthropic` package; no child changes or independent review are claimed. This run addressed only the ISO-week local declaration family.

- `cpython/Modules/_datetimemodule.c` — hoisted `int iso_week` and `int iso_day` into `parse_isoformat_date()`'s opening declaration group and changed only their original initializers to assignments after the `W` marker. ISO-week parsing, default-day behavior, conversion, and return behavior are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion requiring the C89-safe ISO-week declaration/assignment shape.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 27 sources compiled; first stable diagnostics `_datetimemodule.c(769)`/`(770)` C2143 for `iso_week`/`iso_day`, followed by cascades; summary `total=28 compiled=27 cached=0 skipped=0`. |
| focused coding-agent delegation | failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child files were used and no independent review is claimed. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit | exit 1 as required by TDD; `parse_isoformat_date ISO-week declaration missing from opening group: int iso_week;`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit | exit 2; `parse_isoformat_date()` compiled past the ISO-week family. The next first stable diagnostics are `_datetimemodule.c(793)`/`(794)` C2143/C2065 for the distinct `rv` declaration; summary `total=28 compiled=27 cached=0 skipped=0`. |
| applicable regression suites and source checks | exit 0; shell syntax, public/core/PathCch/getpath/stdint/frontier suites and nested `git -C cpython diff --check` all passed. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch` plus diff check | exit 0; compatibility patch regenerated and nested source diff is clean. |
| pristine detached nested `cpython` checkout at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549` plus `git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; patch applies cleanly; temporary worktree removed. |

**Current compile-frontier state:** `parse_isoformat_date()` now compiles past its `iso_week`/`iso_day` C89 declaration-order family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is the distinct `rv` declaration at `_datetimemodule.c(791)` (now observed as `(793)`/`(794)` after the hoist). This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`_datetimemodule.c` `parse_isoformat_date` C89 declaration-order slice)

Date: 2026-09-17 06:39 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`. Before changes, `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` were read. The nested `cpython/` checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains an external/local-only prerequisite through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified compiler banner remains `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded `_datetimemodule.c` frontier was force-re-probed first and remained applicable: 27 sources compiled, and the first stable diagnostics were `_datetimemodule.c(760)`/`(761)` for `parse_isoformat_date()`'s post-statement `uses_separator` declaration. One focused coding-agent delegation was attempted as required, but failed before launch because the runtime lacks the `anthropic` package; no child changes or independent review are claimed. This run addressed only that declaration-order family.

- `cpython/Modules/_datetimemodule.c` — hoisted `unsigned char uses_separator` into `parse_isoformat_date()`'s opening declaration group and changed only its initializer to an assignment at the original evaluation point. Separator detection, pointer advancement, ISO-week handling, and return behavior are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion requiring the C89-safe declaration/assignment shape.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 27 sources compiled; first stable diagnostics `_datetimemodule.c(760)`/`(761)` C2143/C2065 for `uses_separator`; summary `total=28 compiled=27 cached=0 skipped=0`. |
| focused coding-agent delegation | failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child files were used and no independent review is claimed. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit | exit 1 as required by TDD; `parse_isoformat_date separator declaration missing`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit | exit 2; `parse_isoformat_date()` compiled past the `uses_separator` family. The next first stable diagnostics are `_datetimemodule.c(769)`/`(770)` for `iso_week`/`iso_day`, followed by `rv` and later distinct declaration families; summary `total=28 compiled=27 cached=0 skipped=0`. |
| applicable regression suites and source checks | exit 0; shell syntax, public/core/PathCch/getpath/stdint/frontier suites and nested `git -C cpython diff --check` all passed. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch` plus diff check | exit 0; compatibility patch regenerated and nested source diff is clean. |

**Current compile-frontier state:** `parse_isoformat_date()` now compiles past its `uses_separator` C89 declaration-order family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is the distinct `iso_week`/`iso_day` declaration family at `_datetimemodule.c(769)`/`(770)`. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`_datetimemodule.c` `parse_digits` C89 loop-declaration slice)

Date: 2026-09-17 04:31 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`. Before changes, `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` were read. The nested `cpython/` checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains an external/local-only prerequisite through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified compiler banner remains `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded `_datetimemodule.c` frontier was force-re-probed first and remained applicable: 27 sources compiled, and the first stable diagnostics were `_datetimemodule.c(727)` C2143/C2065/C2059 errors from `for (size_t i = ...)`, with declaration-order cascades later in the same source. One focused coding-agent delegation was attempted as required, but failed before launch because the runtime lacks the `anthropic` package; no child changes or independent review are claimed. This run addressed only `parse_digits()`'s loop-counter declaration family.

- `cpython/Modules/_datetimemodule.c` — hoisted `size_t i` into `parse_digits()`'s opening declaration group and changed only the `for` initializer to assignment. Digit parsing, pointer advancement, bounds check, and accumulation order are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion requiring the C89-safe loop-counter declaration and assignment.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 27 sources compiled; first stable blocker `_datetimemodule.c(727)` C2143/C2065/C2059 from the C99 loop declaration; summary `total=28 compiled=27 cached=0 skipped=0`. |
| focused coding-agent delegation | failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child files were used and no independent review is claimed. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit | exit 1 as required by TDD; `parse_digits loop counter declaration missing`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit | exit 2; `parse_digits()` compiled past the line-727 loop family. The next first stable diagnostics are `_datetimemodule.c(760)`/`(761)` for `parse_isoformat_date()`'s post-statement `uses_separator` declaration, followed by later distinct declaration families; summary `total=28 compiled=27 cached=0 skipped=0`. |
| applicable regression suites and source checks | exit 0; shell syntax, public/core/PathCch/getpath/stdint/frontier suites and nested `git -C cpython diff --check` all passed. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch` plus `git -C cpython diff --check` | exit 0; compatibility patch regenerated and nested source diff is clean. |
| pristine detached nested `cpython` worktree at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549` plus `git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; patch applies cleanly; temporary worktree removed. |

**Current compile-frontier state:** `parse_digits()` now compiles past its C89 loop-declaration family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is `parse_isoformat_date()` at `_datetimemodule.c(760)`, beginning with the `uses_separator` declaration after executable statements. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`_datetimemodule.c` `iso_to_ymd` C89 declaration-order slice)

Date: 2026-09-17 02:25 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`. Before changes, `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` were read. The nested `cpython/` checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains an external/local-only prerequisite through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified compiler banner remains `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded `cmathmodule.c` frontier was force-re-probed first and remained applicable: 27 sources compiled, and `_datetimemodule.c` was first. The first stable diagnostics were `_datetimemodule.c(422)` and `(424)` C2143 declaration-order errors for `day_1` and `day_offset`. One focused coding-agent delegation was attempted as required, but failed before launch because the runtime lacks the `anthropic` package; no child changes or independent review are claimed. This run addressed only the `iso_to_ymd()` C89 declaration-order family.

- `cpython/Modules/_datetimemodule.c` — hoisted `day_1` and `day_offset` into the opening declaration group and changed only their later initializers to assignments. ISO-week validation, conversion order, and behavior are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion requiring the C89-safe declaration/assignment shape.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 27 sources compiled; first stable diagnostics were `_datetimemodule.c(422)` and `(424)` C2143 declaration-order errors; summary `total=28 compiled=27 cached=0 skipped=0`. |
| focused coding-agent delegation | failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child files were used and no independent review is claimed. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit | exit 1 as required by TDD; `iso_to_ymd declaration missing from opening group: int day_1;`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit | exit 2; `iso_to_ymd()` compiled past the `day_1`/`day_offset` family. The next first stable diagnostics are `_datetimemodule.c(727)` C89 `for (size_t i = ...)`, followed by declaration-order errors at `(758)` and later; summary `total=28 compiled=27 cached=0 skipped=0`. |
| applicable regression suites and source checks | exit 0; shell syntax, public/core/PathCch/getpath/stdint/frontier suites and nested `git -C cpython diff --check` all passed. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch` plus `git -C cpython diff --check` | exit 0; compatibility patch regenerated and nested source diff is clean. |
| pristine detached `v3.11.16` temporary worktree plus `git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; patch applies cleanly; temporary worktree removed. |

**Current compile-frontier state:** `_datetimemodule.c` now compiles past `iso_to_ymd()`'s C89 declaration-order family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is `parse_digits()` at line 727, beginning with its C99 loop declaration. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`pymath.h` VC6 `Py_NAN` fallback slice)

Date: 2026-09-17 00:17 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`. Before changes, `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` were read. The nested `cpython/` checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains an external/local-only prerequisite through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified compiler banner remains `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded `cmathmodule.c` frontier was re-probed first and remained applicable: 26 sources compiled and `cmathmodule.c(380)` was the first stable diagnostic, `error C2065: 'NAN' : undeclared identifier`, caused by `Py_NAN`'s C99 `NAN` fallback in `Include/pymath.h`. One focused coding-agent delegation was attempted as required, but failed before launch because the runtime lacks the `anthropic` package; no child changes or independent review are claimed. This run addressed only the VC6 `Py_NAN` defect family.

- `cpython/Include/pymath.h` — added an `_MSC_VER < 1300` branch defining `Py_NAN` as `(Py_HUGE_VAL * 0.0)`, retaining the existing builtin and C99 branches for other compilers. No cmath behavior or non-VC6 branch was changed.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added a focused TDD assertion requiring the VC6 fallback and retaining the C99 fallback.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 26 sources compiled; first stable diagnostic `cmathmodule.c(380) C2065: 'NAN' undeclared`; summary `total=27 compiled=26 cached=0`. |
| focused coding-agent delegation | failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child files were used and no independent review is claimed. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit | exit 1 as required by TDD; the new `pymath.h` fallback assertion reported `not ok`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit | exit 2; `cmathmodule.c` compiled past the `NAN` blocker; existing warnings remain at `arraymodule.c(2247)` and `audioop.c(1536)`, `(1609)` C4761. The next first stable diagnostics are `_datetimemodule.c(422)`/`(424)` C2143 declaration-order errors; summary `total=28 compiled=27 cached=0 skipped=0`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check` | exit 0; all applicable regression suites and source checks passed. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch` plus `git -C cpython diff --check` | exit 0; compatibility patch regenerated and nested source diff is clean. |
| pristine detached `v3.11.16` temporary worktree plus `git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; patch applies cleanly; temporary worktree removed. |

**Current compile-frontier state:** `cmathmodule.c` now compiles past the VC6 `Py_NAN`/C99 `NAN` family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is `_datetimemodule.c` at line 422, beginning with C89 declaration-order errors. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`cmathmodule.c` positional PyModuleDef initializer slice)

Date: 2026-09-16 22:10 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`. Before changes, `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` were read. The nested `cpython/` checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains an external/local-only prerequisite through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified compiler banner is `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded `_blake2/blake2s_impl.c` sequence was re-probed first and remained applicable through `binascii.c`. The actual first stable blocker was `cmathmodule.c(380) : error C2065: 'NAN' : undeclared identifier`, with a separate later designated-initializer diagnostic at line 1417. One focused Codex read-only coding-agent delegation inspected this exact source and recommended addressing the narrower `PyModuleDef` designated-initializer family first; it made no changes and no independent review is claimed. This run addressed only that initializer family; the `NAN` blocker remains untouched.

- `cpython/Modules/cmathmodule.c` — replaced only `cmathmodule`'s designated `PyModuleDef` fields with declared-order positional fields: name, doc, size, methods, and slots. Values and module behavior are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion requiring the exact positional initializer and rejecting the designated form.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 26 sources compiled; first stable diagnostics were `cmathmodule.c(380) C2065: 'NAN' undeclared` and `(1417) C2059: syntax error : '.'`; summary `total=27 compiled=26 cached=0 skipped=0`. |
| focused Codex read-only delegation in `/tmp/python-win9x-codex-cmath` | exit 0; recommended the minimal positional `cmathmodule` initializer; no files changed and no tests run by the child. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit | exit 1 as required by TDD; `cmathmodule positional initializer mismatch`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit | exit 2; `cmathmodule.c` compiled past the designated-initializer blocker. The next first stable diagnostic is `cmathmodule.c(380) C2065: 'NAN' undeclared`; existing warnings remain `arraymodule.c(2247)` and `audioop.c(1536)`, `(1609)` C4761; summary `total=27 compiled=26 cached=0 skipped=0`. |
| applicable regression suites and source checks | exit 0; shell syntax, public/core/PathCch/getpath/stdint/frontier suites and `git -C cpython diff --check` all passed. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch && git -C cpython diff --check` | exit 0; compatibility patch regenerated and nested source diff is clean. |
| pristine detached `v3.11.16` temporary worktree plus `git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; patch applies cleanly; temporary worktree removed. |

**Current compile-frontier state:** `cmathmodule.c` now compiles past its C99 designated `PyModuleDef` initializer under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is the distinct `NAN`/`Py_NAN` compatibility blocker at line 380; it was not changed speculatively. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`binascii.c` `a2b_base64` C89 declaration-order slice)

Date: 2026-09-16 20:02 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`. Before changes, `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` were read. The nested `cpython/` checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains an external/local-only prerequisite through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified compiler banner is `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded `_blake2/blake2s_impl.c` sequence was re-probed first and remained applicable through `binascii.c`. The prior `zlib.h` blocker was bypassed narrowly by suppressing `USE_ZLIB_CRC32` for `binascii.c`; its in-tree CRC32 fallback is already present. The new first stable blocker was `binascii_a2b_base64_impl()` C89 declaration ordering at lines 393–418. One focused coding-agent delegation was attempted with Codex but failed before launch because the runtime requires the unavailable `anthropic` package; no child changes or independent review are claimed. This run addressed only the `a2b_base64` declaration family.

- `scripts/vc6-probe-pythoncore-frontier.sh` — suppresses only `USE_ZLIB_CRC32` for `cpython/Modules/binascii.c`, keeping the external zlib dependency out of this minimal frontier while selecting binascii's existing fallback.
- `cpython/Modules/binascii.c` — hoisted the `a2b_base64` locals into the opening declaration group and changed only their initializers to assignments; decoding, error handling, allocation, and loop order are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added focused TDD assertions for the binascii define suppression and C89-safe local/assignment sequence.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 25 sources compiled; first stable diagnostic was `binascii.c(66) : fatal error C1083: Cannot open include file: 'zlib.h'`; summary `total=26 compiled=25 cached=0 skipped=0`. |
| focused Codex delegation | failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child changes were used. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the define-suppression assertion, before build-script edit | exit 1 as required by TDD; `frontier disables unavailable zlib CRC32 path for binascii.c`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after build-script edit | exit 2; binascii compiled past the zlib-header blocker; first stable diagnostics were `binascii.c(393)`–`(418)` C89 declaration errors; summary `total=27 compiled=26 cached=0 skipped=0`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the source assertion, before source edit | exit 1 as required by TDD; `a2b_base64 declaration missing from opening group: const unsigned char *ascii_data;`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit | exit 2; `a2b_base64` compiled past its C89 declaration family. Existing warnings remain `arraymodule.c(2247)`, `audioop.c(1536)`, and `(1609)` C4761. The next first stable diagnostics are `cmathmodule.c(380) : error C2065: 'NAN' : undeclared identifier` and `(1417) : error C2059: syntax error : '.'`; summary `total=27 compiled=26 cached=0 skipped=0`. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch && bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check` | exit 0; all applicable regression suites and source checks passed. |
| pristine detached `v3.11.16` temporary worktree plus `git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; patch applies cleanly; temporary worktree removed. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport wine cmd /c 'call ...\\VCVARS32.BAT && cl'` | exit 0; banner `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. Wine emitted expected headless-display warnings. |

**Current compile-frontier state:** `binascii.c` now compiles past both the unavailable external zlib-header path and `a2b_base64`'s C89 declaration-order family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is the distinct `cmathmodule.c` `NAN`/designated-initializer family at lines 380 and 1417. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.


## Latest revision (`audioop.c` `audioop_ratecv_impl` unavailable `SIZE_MAX` slice)

Date: 2026-09-16 17:50 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`. Before changes, `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` were read. The nested `cpython/` checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains an external/local-only prerequisite through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified compiler banner is `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded `_blake2/blake2s_impl.c` sequence was re-probed first and remained applicable: `_blake2/blake2s_impl.c`, `atexitmodule.c`, and all preceding sources compiled. The actual first stable blocker was `audioop.c(1375) : error C2065: 'SIZE_MAX' : undeclared identifier`. One focused external Codex read-only lane (`codex-cli 0.153.4`) inspected this exact defect and recommended the existing VC6-compatible `(size_t)-1` idiom; it made no changes. This run addressed only that `SIZE_MAX` defect family under the strict TDD cycle.

- `cpython/Modules/audioop.c` — replaced only the `audioop_ratecv_impl()` allocation-overflow guard's `SIZE_MAX` operand with `((size_t)-1)`. The strict comparison, `MemoryError` path, and allocation order are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added a focused source-shape regression requiring the replacement guard, rejecting `SIZE_MAX` within `audioop_ratecv_impl()`, and preserving the error/allocation sequence.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; `_blake2/blake2s_impl.c` and preceding sources compiled, 24 sources compiled, and first stable diagnostic was `cpython\\Modules\\audioop.c(1375) : error C2065: 'SIZE_MAX' : undeclared identifier`; summary `total=25 compiled=24 cached=0 skipped=0`. |
| `codex exec -s read-only --skip-git-repo-check ...` | exit 0; recommended replacing the guard operand with `((size_t)-1)` based on the existing `_pickle.c` precedent; no files changed and no tests were run by the child. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit | exit 1 as required by TDD; `audioop ratecv SIZE_MAX guard replacement missing`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit | exit 2; `audioop.c` compiled past the `SIZE_MAX` blocker, with existing warnings `audioop.c(1536)` and `(1609)` C4761. The next first stable diagnostic is `cpython\\Modules\\binascii.c(66) : fatal error C1083: Cannot open include file: 'zlib.h': No such file or directory`; summary `total=26 compiled=25 cached=0 skipped=0`. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport wine cmd /c 'call ...\\VCVARS32.BAT && cl'` | exit 0; banner `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. Wine emitted expected headless-display warnings. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && git -C cpython diff --check` | exit 0; all applicable regression suites and source checks passed. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch && git -C cpython diff --check` | exit 0; compatibility patch regenerated and nested source diff is clean. |
| pristine detached `v3.11.16` temporary worktree plus `git apply --check` | exit 0; patch applies cleanly; temporary verification worktree removed. |

**Current compile-frontier state:** `audioop_ratecv_impl()` now compiles past its unavailable `SIZE_MAX` family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is the distinct external zlib dependency at `binascii.c(66)` (`zlib.h` unavailable). This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`atexitmodule.c` `atexitmodule` positional PyModuleDef initializer slice)

Date: 2026-09-16 15:44 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`. Before changes, `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` were read. The nested `cpython/` checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains an external/local-only prerequisite through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified compiler banner remains `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded frontier was re-probed first and remained applicable: `_blake2/blake2s_impl.c` and all preceding sources compiled, 23 sources compiled total, and `atexitmodule.c` first failed at line 293 with C2059 on C99 designated fields. This run addressed only that initializer family. One focused external coding-agent lane was attempted in an isolated temporary snapshot; it failed before launch with `Error: No such file or directory (os error 2)` after the initial snapshot setup attempt also used an incorrect relative source path. No child changes or independent review are claimed. The source edit was therefore performed directly under the required TDD cycle.

- `cpython/Modules/atexitmodule.c` — replaced only `atexitmodule`'s designated `PyModuleDef` fields with declared-order positional fields: head, name, doc, size, and methods. Values and module behavior are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion requiring the exact positional initializer and rejecting designated fields.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; `_blake2/blake2s_impl.c` and preceding sources compiled, 23 sources compiled, and first stable diagnostic was `cpython\\Modules\\atexitmodule.c(293) : error C2059: syntax error : '.'`; summary `total=24 compiled=23 cached=0 skipped=0`. |
| focused coding-agent delegation in isolated `/tmp/python-win9x-codex-atexit` snapshot | failed before launch with `Error: No such file or directory (os error 2)`; no child files were used and no independent review is claimed. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit | exit 1 as required by TDD; `atexitmodule positional initializer mismatch`, followed by `FAILED`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit | exit 2; `atexitmodule.c` compiled past the designated-initializer family. The next first stable diagnostic is `cpython\\Modules\\audioop.c(1375) : error C2065: 'SIZE_MAX' : undeclared identifier`; summary `total=25 compiled=24 cached=0`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh` | exit 0; all applicable regression suites and focused frontier assertions reported `ALL TESTS PASSED`. |
| `git -C cpython diff --check` | exit 0. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch && git -C cpython diff --check` | exit 0; compatibility patch regenerated and nested source diff is clean. |
| pristine detached `v3.11.16` temporary worktree plus `git apply --check` | exit 0; patch applies cleanly; temporary worktree removed. |

**Current compile-frontier state:** `atexitmodule.c` now compiles past its C99 designated `PyModuleDef` initializer under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is the distinct `SIZE_MAX` blocker in `audioop.c` at line 1375. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`atexitmodule.c` `atexit_unregister` C89 declaration-order slice)

Date: 2026-09-16 13:37 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`. Before changes, `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` were read. The nested `cpython/` checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains an external/local-only prerequisite through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified compiler banner remains `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. The required one focused coding-agent delegation was attempted but failed before launch because the runtime lacks the `anthropic` package; no child changes or independent review are claimed.

The recorded frontier was re-probed first, but its state had advanced beyond the recorded `atexit_register()` blocker: 23 sources compiled through `atexitmodule.c`, and the actual first stable diagnostics were in `atexit_unregister()` at line 243. This run addressed only that C89 declaration-order family: the loop counter `i`, callback pointer `cb`, and comparison result `eq`.

- `cpython/Modules/atexitmodule.c` — hoisted `int i`, `atexit_callback *cb`, and `int eq` before executable statements; changed the loop, callback lookup, and rich-comparison declarations to assignments at their original evaluation points. Unregister traversal, error handling, callback deletion, and ordering are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion requiring the three opening declarations, rejecting mixed declarations, and preserving loop/lookup/comparison assignments.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 23 sources compiled through `atexitmodule.c`; first stable diagnostics were `atexitmodule.c(243)` C2143/C2065/C2059/C2044 errors from `for (int i = ...)` and later `cb`/`eq` declarations; summary `total=24 compiled=23 cached=0 skipped=0`. |
| focused coding-agent delegation | failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child changes were used. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit | exit 1 as required by TDD; `atexit_unregister declaration missing from opening group: int i;`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit | exit 2; `atexit_unregister()` compiled past its declaration-order family. The next first stable diagnostic is `atexitmodule.c(293) C2059` for the remaining designated module initializer; summary `total=24 compiled=23 cached=0 skipped=0`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && git -C cpython diff --check` | exit 0; all applicable regression suites and source checks passed. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch && git -C cpython diff --check` | exit 0; compatibility patch regenerated and nested source diff is clean. |
| pristine detached `v3.11.16` temporary worktree plus `git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; patch applies cleanly; temporary worktree removed. |

**Current compile-frontier state:** `atexit_unregister()` now compiles past its C89 declaration-order family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is the separate designated initializer in `atexitmodule.c` at line 293. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`atexitmodule.c` `atexit_register` C89 declaration-order slice)

Date: 2026-09-16 11:29 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`. The nested `cpython/` checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains an external/local-only prerequisite through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified compiler banner remains `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. The required focused coding-agent delegation was attempted but failed before launch because the runtime lacks the `anthropic` package; no child changes or independent review are claimed.

The recorded `atexitmodule.c` frontier was re-probed first and remained applicable: 23 sources compiled through `_blake2/blake2s_impl.c`, and `atexitmodule.c` was first. This run addressed only `atexit_register()`'s C89 declaration-order family. The later `atexit_clear()` loop/declaration blockers remain untouched.

- `cpython/Modules/atexitmodule.c` — hoisted `func`, `state`, `r`, `size`, and `callback` into the function's opening declaration group; changed only declaration initializers to assignments at their original evaluation points. Registration, allocation, reference-counting, error handling, and callback ordering are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion requiring the five opening declarations, rejecting mixed declarations, and preserving assignment/reallocation order.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 23 sources compiled; first stable diagnostics were `atexitmodule.c(150)` for `PyObject *func`, followed by `atexitmodule.c(157)`, `(161)`, and `(169)` declaration-order/cascade diagnostics; summary `total=24 compiled=23 cached=0 skipped=0`. |
| focused coding-agent delegation | failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child changes or independent review are claimed. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit | exit 1 as required by TDD; `atexit_register declaration missing from opening group: PyObject *func;`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit | exit 2; `atexit_register()` compiled past its declaration family. The next first stable diagnostics are `atexitmodule.c(243)` C2143/C2065/C2059 errors for the later `atexit_clear()` loop/declarations; summary `total=24 compiled=23 cached=0 skipped=0`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && git -C cpython diff --check` | exit 0; all applicable regression suites and source checks passed. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch && git -C cpython diff --check` | exit 0; compatibility patch regenerated and nested source diff is clean. |
| pristine detached `v3.11.16` temporary worktree plus `git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; patch applies cleanly; temporary worktree removed. |

**Current compile-frontier state:** `atexit_register()` now compiles past its C89 declaration-order family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is the distinct `atexit_clear()` blocker at `atexitmodule.c(243)`. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`atexitmodule.c` `atexit_callfuncs` mixed-declaration slice)

Date: 2026-09-16 09:23 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`. The nested `cpython/` checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. Before changes, `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` were read. MSVC6 remains an external/local-only prerequisite through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified compiler banner remains `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. One focused coding-agent delegation was attempted, but failed before launch because the runtime lacks the `anthropic` package; no child changes or independent review are claimed.

The recorded frontier was re-probed first and remained applicable: `cpython/Modules/_blake2/blake2s_impl.c` and all preceding sources compiled, 23 sources compiled total, and `atexitmodule.c` was first. This run addressed only `atexit_callfuncs()`'s post-statement `the_func`/`res` declaration family. The later `atexitmodule.c` declaration families remain untouched.

- `cpython/Modules/atexitmodule.c` — hoisted `PyObject *the_func` and `PyObject *res` into the opening declaration group and changed only their declaration initializers to assignments at the existing callback-call point. Callback order, reference-counting, error handling, and cleanup behavior are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion requiring the two opening-group declarations, rejecting the mixed declarations, and preserving both assignment statements.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 23 sources compiled through `_blake2/blake2s_impl.c` and `arraymodule.c`; first stable diagnostics were `atexitmodule.c(99)` C2143 and `(100)` C2275/C2065 for `the_func`/`res`; summary `total=24 compiled=23 cached=0 skipped=0`. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport wine cmd /c 'call Z:\\\\home\\\\ubuntu\\\\Organized\\\\Legacy-Ports\\\\Projects\\\\python-win9x\\\\MSVC600\\\\VC98\\\\Bin\\\\VCVARS32.BAT && cl'` | exit 0; banner `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`; Wine emitted expected headless-display warnings. |
| focused coding-agent delegation | failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child changes were used. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit | exit 1 as required by TDD; `atexit_callfuncs: the_func declaration missing`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit | exit 2; `atexit_callfuncs()` compiled past the `the_func`/`res` family. The next first stable diagnostics are `atexitmodule.c(150)` for `atexit_register()`'s mixed declaration, followed by `atexitmodule.c(157)` and later blockers; summary `total=24 compiled=23 cached=0 skipped=0`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check` | exit 0; all applicable regression suites and source checks passed. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch && git -C cpython diff --check` | exit 0; compatibility patch regenerated and nested source diff is clean. |
| pristine detached `v3.11.16` temporary worktree plus `git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; patch applies cleanly; temporary worktree removed. |

**Current compile-frontier state:** `atexit_callfuncs()` now compiles past its mixed-declaration family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is `atexit_register()` at `atexitmodule.c(150)`. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`atexitmodule.c` C89 loop-declaration slice)

Date: 2026-09-16 07:16 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`. The nested `cpython/` checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. Before changes, `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` were read. MSVC6 remains an external/local-only prerequisite through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified compiler banner remains `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded `_blake2/blake2s_impl.c` sequence was re-probed first and remained passed: 23 sources compiled through `arraymodule.c`, and `atexitmodule.c` was first. This run addressed only the C89 loop-declaration family at `atexit_cleanup()` and `atexit_callfuncs()`. One focused Codex implementation lane (`codex-cli 0.153.4`) ran in an isolated temporary snapshot; its exact two-function candidate was inspected and applied manually. No independent review is claimed.

- `cpython/Modules/atexitmodule.c` — added opening-group `int i` declarations in `atexit_cleanup()` and `atexit_callfuncs()`, changing only the two `for` initializers to assignments. Callback cleanup/call order and behavior are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added focused TDD assertions for both C89-safe loop forms and preserved loop sequences.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

|| Command | Result |
|---|---|
|| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; `_blake2/blake2s_impl.c` and preceding sources compiled, 23 sources compiled total, and first stable diagnostics were `atexitmodule.c(43)` and `(90)` C2143/C2065/C2059/C2044 errors from C99 `for (int i = ...)` declarations; summary `total=24 compiled=23 cached=0 skipped=0`. |
|| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit | exit 1 as required by TDD; `cleanup: loop counter declaration missing`. |
|| isolated `codex exec -s workspace-write --skip-git-repo-check ...` | exit 0; candidate changed only the two requested loops in `atexitmodule.c`; exact-content and whitespace checks passed; no build/runtime tests were run by the candidate. |
|| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | exit 0; `ALL TESTS PASSED`. |
|| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit | exit 2; both loop-declaration blockers cleared. The next first stable diagnostics are `atexitmodule.c(99)`/`(100)` for post-statement `the_func`/`res` declarations, followed by later mixed declarations; summary `total=24 compiled=23 cached=0 skipped=0`. |
|| `bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check` | exit 0; all applicable regression suites and source checks passed. |
|| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch && git -C cpython diff --check` | exit 0; compatibility patch regenerated and nested source diff is clean. |
|| pristine detached `v3.11.16` temporary worktree plus `git apply --check` | exit 0; patch applies cleanly; temporary verification worktree removed. |

**Current compile-frontier state:** `atexitmodule.c` now compiles past its two C89 loop-declaration blockers under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is the separate `atexit_callfuncs()` mixed-declaration family at lines 99–100. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`arraymodule.c` `arraymodule` PyModuleDef positional-initializer slice)

Date: 2026-09-16 05:09 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`. The nested `cpython/` checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. Before changes, `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` were read. MSVC6 remains an external/local-only prerequisite through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified compiler banner remains `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded `_blake2/blake2s_impl.c` sequence was re-probed first and remained passed: `_blake2/blake2s_impl.c` and the preceding sources compiled, 22 sources compiled in total, and `arraymodule.c` was first. The first stable diagnostics were the separate C99 designated initializer at `arraymodule.c(3161)`; the earlier `array_modexec()` declaration-order family was clear. One focused coding-agent delegation was attempted as required, but failed before launch because the runtime lacks the `anthropic` package; no child changes or independent review are claimed. This run addressed only the `arraymodule` PyModuleDef initializer family.

- `cpython/Modules/arraymodule.c` — converted `arraymodule` to declared-order positional `PyModuleDef` initialization: base, name, doc, size, methods, slots, traverse, clear, and free. Values and behavior are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion requiring the exact positional initializer and rejecting designated fields.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; `_blake2/blake2s_impl.c` and preceding sources compiled; 22 sources compiled; first stable diagnostics were `arraymodule.c(3161) C2059` for `.` and `,`; summary `total=23 compiled=22 cached=0 skipped=0`. |
| focused coding-agent delegation | failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child changes were used. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit | exit 1 as required by TDD; `arraymodule positional initializer mismatch`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit | exit 2; `arraymodule.c` compiled successfully, with existing warning `arraymodule.c(2247) C4761`; next first stable blocker is `atexitmodule.c(43)` C89 loop declarations and related mixed declarations; summary `total=24 compiled=23 cached=0 skipped=0`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check` | exit 0; all applicable regression suites and source checks passed. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch && git -C cpython diff --check` | exit 0; compatibility patch regenerated and nested source diff is clean. |
| pristine detached `v3.11.16` temporary worktree plus `git apply --check` | exit 0; patch applies cleanly; temporary verification worktree removed. |

**Current compile-frontier state:** `arraymodule.c` now compiles past its PyModuleDef designated-initializer family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is `atexitmodule.c(43)`, beginning with C89 loop-declaration errors. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`arraymodule.c` `array_modexec` C89 declaration-order slice)

Date: 2026-09-16 03:01 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`. The nested `cpython/` checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. Before changes, `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` were read. MSVC6 remains an external/local-only prerequisite through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified compiler banner remains `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded frontier was re-probed first and remained applicable: `_blake2/blake2s_impl.c` and the preceding sources compiled, 22 sources compiled in total, and `arraymodule.c` first failed on `array_modexec()` declarations at lines 3114, 3119, and 3125. This run addressed only that C89 declaration-order family. One focused Codex implementation lane (`codex-cli 0.153.4`) ran in an isolated copy with the existing edits; its candidate was inspected and applied manually. No independent review is claimed.

- `cpython/Modules/arraymodule.c` — hoisted `abc_mod`, `mutablesequence`, and `res` into `array_modexec()`'s opening declaration group and changed only their declaration initializers to assignments at the original evaluation points. Import, attribute lookup, registration, cleanup, and error behavior are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion for the three C89-safe declarations and preserved assignment sequence.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 22 sources compiled; first stable diagnostics were `arraymodule.c(3114)`, `(3119)`, and `(3125)` C2275/C2065 declaration errors for `abc_mod`, `mutablesequence`, and `res`; the later designated initializer was at `(3158)`; summary `total=23 compiled=22 cached=0 skipped=0`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit | exit 1 as required by TDD; `array_modexec local missing from opening declaration group: PyObject *abc_mod;`. |
| isolated `codex exec -s workspace-write --skip-git-repo-check ...` | exit 0; candidate changed only the requested `array_modexec()` source block; its scope assertion passed and `git diff --check` produced no output. No candidate build or runtime tests were run. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit | exit 2; the three `array_modexec()` declaration blockers cleared. The next first stable diagnostics are the separate designated `arraymodule` initializer at `arraymodule.c(3161)` C2059; summary `total=23 compiled=22 cached=0 skipped=0`. |
| `bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check` | exit 0; all applicable regression suites and source checks passed. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch && git -C cpython diff --check` | exit 0; compatibility patch regenerated and nested source diff is clean. |
| pristine detached `v3.11.16` temporary worktree plus `git apply --check` | exit 0; patch applies cleanly; temporary verification worktree removed. |

**Current compile-frontier state:** `array_modexec()` now compiles past its three C89 declaration-order blockers under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is the separate designated initializer in `arraymodule` at line 3161. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`arraymodule.c` `arrayiter_spec` positional-initializer slice)

Date: 2026-09-16 00:54 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`. The nested `cpython/` checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. Before this run, `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` were read. MSVC6 remains an external/local-only prerequisite through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified compiler banner remains `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded frontier was re-probed first and remained applicable: 22 sources compiled, including `_blake2/blake2s_impl.c`, and `arraymodule.c` first failed at the C99 designated initializer for `arrayiter_spec` at line 3026. This run addressed only that initializer family. The focused coding-agent delegation was attempted and failed before launch because the runtime lacks the `anthropic` package; no child changes or independent review are claimed.

- `cpython/Modules/arraymodule.c` — converted `arrayiter_spec` to declared-order positional `PyType_Spec` initialization: name, basicsize, itemsize (`0`), flags, and slots. Values and behavior are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion rejecting designated fields and requiring the positional field order.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 22 sources compiled; first stable diagnostic was `arraymodule.c(3026) C2059 syntax error : '.'`; later blockers were `(3113)`, `(3118)`, `(3124)`, and `(3157)`; summary `total=23 compiled=22 cached=0 skipped=0`. |
| focused coding-agent delegation | failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child changes were used. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit | exit 1 as required by TDD; `arrayiter_spec retains designated fields`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit | exit 2; the `arrayiter_spec` C2059 blocker cleared. The next first stable diagnostics are `arraymodule.c(3114)`, `(3119)`, and `(3125)` for post-statement locals in `array_modexec()`, followed by the designated `arraymodule` initializer at `(3158)`; summary `total=23 compiled=22 cached=0 skipped=0`. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport wine cmd /c 'call Z:\\\\home\\\\ubuntu\\\\Organized\\\\Legacy-Ports\\\\Projects\\\\python-win9x\\\\MSVC600\\\\VC98\\\\Bin\\\\VCVARS32.BAT && cl'` | exit 0; banner `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. Wine emitted expected headless-display warnings. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check` | exit 0; all applicable regression suites and source checks passed. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch && git -C cpython diff --check` | exit 0; compatibility patch regenerated and nested source diff is clean. |
| pristine detached `v3.11.16` temporary worktree plus `git apply --check` | exit 0; patch applies cleanly; temporary verification worktree removed. |

**Current compile-frontier state:** `arraymodule.c` now compiles past `arrayiter_spec`'s C99 designated-initializer family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is `array_modexec()`'s post-statement `abc_mod`, `mutablesequence`, and `res` declarations at lines 3114, 3119, and 3125. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`arraymodule.c` `array_arrayiterator___reduce___impl` C89 declaration-order slice)

Date: 2026-09-15 22:45 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`. The nested `cpython/` checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. Before changes, `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` were read. MSVC6 remains an external/local-only prerequisite through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified compiler banner remains `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. One focused coding-agent delegation was attempted as required, but failed before launch because the runtime lacks the `anthropic` package; no child changes or independent review are claimed.

The current frontier was re-probed first and remained applicable: `_blake2/blake2s_impl.c` and the preceding sources compiled, 22 sources compiled in total, and `arraymodule.c` remained first. The first stable diagnostics were `arraymodule.c(2976)`/`(2978)` from `array_arrayiterator___reduce___impl()` declarations after executable statements. This run addressed only that C89 declaration-order family. The later `arrayiter_spec` designated initializer at line 3026 and module-setup blockers remain untouched.

- `cpython/Modules/arraymodule.c` — hoisted `array_state *state` and `PyObject *func` into the opening declaration group and changed only their later declaration initializers to assignments. Lookup, assertion, iterator handling, and return behavior are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion requiring the declaration group and preserved state lookup/func assignment sequence.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 22 sources compiled; first stable diagnostics were `arraymodule.c(2976)` C2143 and `(2978)` undeclared/cascade errors for `func`; later diagnostics included lines 2992, 3004, 3024, 3111, 3116, 3122, and 3155; summary `total=23 compiled=22 cached=0 skipped=0`. |
| focused coding-agent delegation | failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child changes were used. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after the corrected assertion, with source unchanged | exit 1 as required by TDD; `array iterator reduce state declaration missing from opening group`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit | exit 2; the `array_arrayiterator___reduce___impl()` C2143/undeclared-local blockers cleared. The next first stable diagnostic is `arraymodule.c(3026)` C2059 for the separate `arrayiter_spec` designated initializer; later blockers remain at 3113, 3118, 3124, and 3157; summary `total=23 compiled=22 cached=0 skipped=0`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check` | exit 0; all applicable regression suites and source checks passed. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch && git -C cpython diff --check` | exit 0; compatibility patch regenerated and nested source diff is clean. |
| pristine detached `v3.11.16` temporary worktree plus `git apply --check` | exit 0; patch applies cleanly; temporary verification worktree removed. |
| `git diff --check` at the workspace root | exit 2 only on the generated compatibility patch's pre-existing patch-payload trailing-whitespace lines; nested `git -C cpython diff --check` remains exit 0. |

**Current compile-frontier state:** `array_arrayiterator___reduce___impl()` now compiles past its C89 declaration-order family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is the separate `arrayiter_spec` C99 designated initializer at `arraymodule.c(3026)`. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`arraymodule.c` `arrayiter_next` C89 declaration-order slice)

Date: 2026-09-15 20:27 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`. The nested `cpython/` checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. `README.md` and the legacy-toolchain reference at `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` were read before changes. MSVC6 remains an external/local-only prerequisite through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified compiler banner is `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. One focused coding-agent delegation was attempted as required, but could not launch because the runtime lacks the `anthropic` package; no child changes or independent review are claimed.

The recorded frontier was re-probed first and remained applicable: `_blake2/blake2s_impl.c` and the preceding sources compiled, 22 sources compiled in total, and `arraymodule.c` remained first. The first stable diagnostics were `arraymodule.c(2922)`/`(2923)` from `arrayiter_next()`'s debug-only `array_state` declaration after executable statements. This run addressed only that C89 declaration-order family. The later `array_arrayiterator___reduce___impl()` declaration at line 2976, `arrayiter_spec` designated initializer, and module-setup blockers remain untouched.

- `cpython/Modules/arraymodule.c` — added a bare `array_state *state` to `arrayiter_next()`'s opening declaration group and changed the debug-only lookup to an assignment. The `#ifndef NDEBUG` guard, type assertion, lookup point, and iterator behavior are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion requiring the C89-safe declaration and preserved debug lookup/assertion sequence.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 22 sources compiled; first stable diagnostics were `arraymodule.c(2922)` C2143 and `(2923)` undeclared/cascade errors for `state`; later diagnostics included lines 2975, 2991, 3023, 3110, 3115, 3121, and 3154; summary `total=23 compiled=22 cached=0 skipped=0`. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport wine cmd /c 'call Z:\\\\home\\\\ubuntu\\\\Organized\\\\Legacy-Ports\\\\Projects\\\\python-win9x\\\\MSVC600\\\\VC98\\\\Bin\\\\VCVARS32.BAT && cl'` | exit 0; banner `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. Wine emitted expected headless-display warnings. |
| focused coding-agent delegation | failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child changes were used. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit | exit 1 as required by TDD; after correcting the assertion matcher, it failed with `arrayiter_next state declaration missing from opening group`. No production source was changed before the expected red result. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit | exit 2; the `arrayiter_next()` C2143/state blockers cleared. The next first stable diagnostics are `arraymodule.c(2976)`/`(2978)` for `array_arrayiterator___reduce___impl()`'s post-statement `array_state`/`func` declarations, followed by lines 2992, 3024, 3111, 3116, 3122, and 3155; summary `total=23 compiled=22 cached=0 skipped=0`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check` | exit 0; all applicable regression suites and source checks passed. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch && git -C cpython diff --check` | exit 0; compatibility patch regenerated and nested source diff is clean. |
| pristine detached `v3.11.16` temporary worktree plus `git apply --check` | exit 0; patch applies cleanly; temporary verification worktree removed. |

**Current compile-frontier state:** `arrayiter_next()` now compiles past its C89 declaration-order family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is `array_arrayiterator___reduce___impl()` at `arraymodule.c(2976)`. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`arraymodule.c` `array_spec` positional-initializer slice)

Date: 2026-09-15 18:24 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`; the nested `cpython/` checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. The relevant reference was read from `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md`. MSVC6 remains an external/local-only prerequisite through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified compiler banner remains `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded frontier was re-probed first and remained applicable: `_blake2/blake2s_impl.c` compiled cleanly, 22 sources compiled, and `arraymodule.c` first failed at the C99 designated initializer for `array_spec` at line 2876. This run addressed only that initializer family. One focused Codex implementation lane (`codex-cli 0.153.4`) ran in an isolated minimal copy after an initial oversized-copy attempt hit `/tmp` disk-quota exhaustion; the candidate diff was inspected and applied manually. No independent review is claimed.

- `cpython/Modules/arraymodule.c` — converted `array_spec` to declared-order positional `PyType_Spec` initialization: name, basicsize, itemsize (`0`), flags, and slots. Values and behavior are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion rejecting designated fields and requiring the positional field order.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; `_blake2/blake2s_impl.c` compiled cleanly, 22 sources compiled, and first stable diagnostics were `arraymodule.c(2876) C2059 syntax error : '.'`; later diagnostics included iterator declaration-order, additional designated initializers, and module-setup blockers; summary `total=23 compiled=22 cached=0 skipped=0`. |
| focused assertion after adding it, before source edit | exit 1 as required by TDD; `array_spec retains designated fields`. |
| focused Codex implementation lane in `/tmp/python-win9x-codex-array-spec` | exit 0; candidate changed only the requested `array_spec` source block, with positional fields in declared order; candidate diff was inspected before manual application. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit | exit 2; the `array_spec` C2059 blocker cleared. The next first stable diagnostics are `arraymodule.c(2922)`/`(2923)` for `arrayiter_next()`'s debug-only `array_state` declaration after executable statements, followed by distinct declaration, initializer, and module-setup blockers; summary `total=23 compiled=22 cached=0 skipped=0`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check` | exit 0; all applicable regression suites and source checks passed. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch && git -C cpython diff --check` | exit 0; compatibility patch regenerated and nested source diff is clean. |
| pristine detached `v3.11.16` temporary worktree plus `git apply --check` | exit 0; patch applies cleanly; temporary worktree removed. |

**Current compile-frontier state:** `arraymodule.c` now compiles past `array_spec`'s C99 designated-initializer family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is the separate `arrayiter_next()` debug-block declaration-order family at `arraymodule.c(2922)`. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`arraymodule.c` `arraytype_doc` VC6 string-size slice)

Date: 2026-09-15 16:14 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`; the nested `cpython/` checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. The legacy-toolchain reference was read from `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md`. MSVC6 remains an external/local-only prerequisite through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified compiler banner remains `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded frontier was re-probed first and remained applicable: `_blake2/blake2s_impl.c` compiled cleanly, 22 sources compiled, and `arraymodule.c` remained first. The first stable diagnostic was `arraymodule.c(2830) : error C2026: string too big, trailing characters truncated` in `arraytype_doc`. This run addressed only that VC6 string-literal-size family. One focused Codex implementation lane (`codex-cli 0.153.4`) ran in an isolated `/tmp/python-win9x-codex-array-doc` copy, preserved the existing local edits, and supplied the candidate shape. The candidate was inspected and applied manually; no independent review is claimed.

- `cpython/Modules/arraymodule.c` — split `arraytype_doc` at the existing documentation-section boundary into adjacent string literals, keeping the complete 2,340-byte documentation text and the existing `PyDoc_STRVAR`/`Py_tp_doc` behavior unchanged. The resulting literal chunks are 1,346 and 994 bytes.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added a focused TDD assertion that all literals are at most 2,048 bytes, the concatenated documentation SHA-256 remains `36d98a6261ec374e1e5ed2da654bb1c47286a2658b86c28800af1543c40f6822`, and the type documentation slot is retained.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; `_blake2/blake2s_impl.c` compiled cleanly, 22 sources compiled, and first stable diagnostics were `arraymodule.c(2830) C2026 string too big`, followed by designated-initializer, declaration-order, and module-setup blockers; summary `total=23 compiled=22 cached=0 skipped=0`. |
| `codex exec -s workspace-write --skip-git-repo-check ...` in isolated `/tmp/python-win9x-codex-array-doc` | exit 0; candidate changed only `arraymodule.c` and the focused test, reported RED exit 1 before the source split and GREEN exit 0 after it, and passed shell syntax checking. No candidate files were copied automatically. |
| focused TDD assertion in the delegated copy before source edit | exit 1 as required by TDD; `arraytype_doc exceeds VC6's 2048-byte individual string literal limit`. |
| focused TDD assertion in the delegated copy after source edit | exit 0; `ok - arraymodule arraytype_doc uses VC6-sized literals with unchanged text`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after applying the source edit | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after the source edit | exit 2; the C2026 blocker cleared. The next first stable diagnostic is `arraymodule.c(2876) : error C2059: syntax error : '.'` for `array_spec`, followed by declaration-order and module-setup blockers; summary `total=23 compiled=22 cached=0 skipped=0`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check` | exit 0; every applicable regression suite and source check reported `ALL TESTS PASSED`. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch && git -C cpython diff --check` | exit 0; compatibility patch regenerated and nested source diff is clean. |
| pristine detached `v3.11.16` temporary worktree plus `git apply --check` | exit 0; patch applies cleanly; temporary worktree removed. |

**Current compile-frontier state:** `arraymodule.c` now compiles past `arraytype_doc`'s VC6 string-size family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is the separate C99 designated initializer in `array_spec` at line 2876. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`arraymodule.c` `typecode_to_mformat_code` 64-bit width spelling slice)

Date: 2026-09-15 14:07 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`; the nested `cpython/` checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. The legacy-toolchain reference was read from `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md`. MSVC6 remains an external/local-only prerequisite through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified compiler banner remains `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded frontier was re-probed first and remained applicable: `_blake2/blake2s_impl.c` compiled cleanly, 22 sources compiled, and `arraymodule.c` remained first with `sizeof(long long)` diagnostics at `arraymodule.c(1911)` and `(1915)`. One focused coding-agent delegation was attempted but failed before launch because the `anthropic` package is unavailable; no child changes or independent review are claimed. This run addressed only that `sizeof(long long)` defect family.

- `cpython/Modules/arraymodule.c` — changed only the q/QQ cases in `typecode_to_mformat_code()` from `sizeof(long long)` to `sizeof(PY_LONG_LONG)`. Signedness, typecode dispatch, width calculation, and behavior are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion requiring exactly two `sizeof(PY_LONG_LONG)` assignments in `typecode_to_mformat_code()` and rejecting the old spelling.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 22 sources compiled; first stable diagnostics were `arraymodule.c(1911)` and `(1915)`, `error C2632: 'long' followed by 'long' is illegal`; later diagnostics included string-size, initializer, declaration-order, and API blockers; summary `total=23 compiled=22 cached=0 skipped=0`. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport wine cmd /c 'call ...\\VCVARS32.BAT && cl'` | exit 0; compiler banner `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. |
| focused coding-agent delegation | failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child changes were used. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit | exit 1 as required by TDD; `get_native_typecode q/QQ width is not VC6-compatible`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit | exit 2; the `(1911)`/`(1915)` diagnostics cleared. The next first stable diagnostics are `arraymodule.c(2830)` string-size, `(2876)` initializer, `(2921)` declaration-order, and later API/setup blockers; summary `total=23 compiled=22 cached=0 skipped=0`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check` | exit 0; all applicable regression suites and source checks reported `ALL TESTS PASSED`. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch && git -C cpython diff --check` | exit 0; compatibility patch regenerated and nested source diff clean. |
| pristine detached `v3.11.16` temporary worktree plus `git apply --check` | exit 0; patch applies cleanly; temporary worktree removed. |

**Current compile-frontier state:** `typecode_to_mformat_code()` now compiles past its q/QQ `sizeof(long long)` keyword family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is `arraymodule.c(2830)`, the separate string-size family. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`arraymodule.c` `array_array_fromunicode` C89 declaration-order slice)

Date: 2026-09-15 11:59 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`; the nested `cpython/` checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. The legacy-toolchain reference was read from `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md`. MSVC6 remains an external/local-only prerequisite through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified compiler banner remains `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded frontier was re-probed first and remained applicable: `_blake2/blake2s_impl.c` compiled cleanly, 22 sources compiled, and `arraymodule.c` remained first with C89 declaration diagnostics at `arraymodule.c(1746)` and `(1750)`. This run addressed only `array_array_fromunicode_impl()`'s `ustr_length`/`old_size` declaration-order family. One focused Codex read-only delegation (`codex-cli 0.153.4`) inspected the exact function and recommended the minimal hoist; it made no changes. No independent review is claimed.

- `cpython/Modules/arraymodule.c` — hoisted `ustr_length` into the function declaration group and `old_size` before the decrement in the guarded block; changed only the declaration initializers to assignments, preserving conversion/guard/decrement/resize evaluation points and behavior.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added focused TDD assertions for the declaration groups, assignment sequence, and preserved guard/decrement behavior.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 22 sources compiled; first stable diagnostics were `arraymodule.c(1746)`/`(1750)` for C89 `ustr_length`/`old_size`; later diagnostics included 64-bit, string-size, initializer, and API blockers; summary `total=23 compiled=22 cached=0 skipped=0`. |
| `codex exec -s read-only --skip-git-repo-check ...` | exit 0; recommended hoisting exactly `ustr_length` and `old_size`, retaining their original evaluation points; no files changed. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit | exit 1 as required by TDD; `fromunicode: ustr_length declaration missing from opening group`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit | exit 2; both `ustr_length`/`old_size` diagnostics cleared. The next first stable diagnostics are `arraymodule.c(1911)`/`(1915)` for the separate `long long` family, followed by string-size, initializer, declaration-order, and API blockers; summary `total=23 compiled=22 cached=0 skipped=0`. |
| full applicable regression suite and source checks | exit 0; shell syntax, public/core/PathCch/getpath/stdint/frontier suites and `git -C cpython diff --check` all passed. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch` plus diff check | exit 0; compatibility patch regenerated and source diff clean. |
| pristine detached `v3.11.16` temporary worktree plus `git apply --check` | exit 0; patch applies cleanly; temporary worktree removed. |

**Current compile-frontier state:** `array_array_fromunicode_impl()` now compiles past its `ustr_length`/`old_size` C89 declaration-order family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is the separate `long long` family at `arraymodule.c(1911)` and `(1915)`. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`arraymodule.c` `array_state` declaration-order slice)

Date: 2026-09-15 09:53 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`; the nested `cpython/` checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. The relevant reference was read from `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md`. MSVC6 remains an external/local-only prerequisite through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified banner remains `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded frontier was re-probed first and remained applicable: 22 sources compiled, including `_blake2/blake2s_impl.c`, then `arraymodule.c` was first. This run addressed only the two C89 declaration-order diagnostics for `array_state` in `array_array_fromfile_impl()` and `array_array_tofile_impl()`. One focused Codex read-only delegation inspected the exact functions and recommended the minimal hoist; it made no changes. No independent review is claimed.

- `cpython/Modules/arraymodule.c` — added one bare `array_state *state` declaration to each function's opening declaration group and changed only the two later declaration initializers to assignments. Lookup timing, early exits, assertions, and write/read sequences are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added focused TDD assertions for both functions.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.

**Exact command results:** prior slice recorded in the following historical entry; all applicable regression suites, patch regeneration, and pristine patch application passed.

**Current compile-frontier state:** `array_array_fromfile_impl()` and `array_array_tofile_impl()` now compile past their `array_state` declaration-order family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier was `arraymodule.c(1746)`/`(1750)`, addressed in the entry above. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`arraymodule.c` `array_repeat` C89 declaration-order slice)

Date: 2026-09-15 03:34 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`; the nested `cpython/` checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. The legacy-toolchain reference was read from `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md`. MSVC6 remains an external/local-only prerequisite invoked through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified compiler banner remains `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded `arraymodule.c(920)` frontier was re-probed first and remained true: 22 sources compiled, including `_blake2/blake2s_impl.c`, then `array_repeat()` was the first failing source. This run addressed only its C89 declaration-order family. One focused Codex read-only implementation-guidance lane (`codex-cli 0.153.4`) inspected the exact function and recommended the same five-local hoist; it made no changes. No independent review is claimed.

- `cpython/Modules/arraymodule.c` — hoisted `array_length`, `size`, `np`, `oldbytes`, and `newbytes` before executable statements; changed only their later declaration initializers to assignments, preserving normalization, overflow checks, allocation, early returns, and byte repetition order.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion requiring the C89-safe declaration group and preserved assignment sequence.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 22 sources compiled; first stable diagnostics were `arraymodule.c(920)`, `(924)`, `(925)`, `(931)`, and `(932)` for mixed C99 declarations in `array_repeat()`; later blockers included lines 1086, 1171, 1494, 1552, 1741, 1745, 1902, 1906, 2821, 2867, 2912, 2965, 2981, 3013, and 3100; summary `total=23 compiled=22 cached=0 skipped=0`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit | exit 1 as required by TDD; `array_repeat declaration missing: Py_ssize_t array_length`. |
| `codex exec -s read-only --skip-git-repo-check ...` focused implementation guidance | exit 0; recommended hoisting the five locals and preserving assignments at the original evaluation points; no files changed. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit | exit 2; `array_repeat()` compiled past the five declaration diagnostics. The next first stable diagnostics are `arraymodule.c(1086)` for `array_inplace_repeat()`'s post-statement `size` declaration, followed by distinct loop/declaration, API, 64-bit, string-size, initializer, and module-setup blockers; summary `total=23 compiled=22 cached=0 skipped=0`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check` | exit 0; all applicable regression suites and source checks reported `ALL TESTS PASSED`. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch && git -C cpython diff --check` | exit 0; compatibility patch regenerated and nested source diff clean. |
| pristine detached `v3.11.16` temporary worktree plus `git apply --check` | exit 0; patch applies cleanly; temporary worktree removed. |

**Current compile-frontier state:** `array_repeat()` now compiles past its C89 declaration-order family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is `array_inplace_repeat()` at `arraymodule.c(1086)`. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`arraymodule.c` `array_richcompare` duplicate `cmp` declaration slice)

Date: 2026-09-15 01:27 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`; the nested `cpython/` checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. The relevant reference was read from `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md`. MSVC6 remains an external/local-only prerequisite invoked through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the previously verified banner is `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded frontier was re-probed first and remained applicable: 22 sources compiled, then `arraymodule.c` failed first at the distinct duplicate `int cmp;` declaration after `compare_sizes:`. This run addressed only that C89 declaration-order family. One focused coding-agent implementation delegation was attempted and failed before launch because the `anthropic` package is unavailable; no child changes or independent review are claimed.

- `cpython/Modules/arraymodule.c` — removed only the duplicate `int cmp;` declaration after `compare_sizes:`; the opening declaration remains the sole local and the size-comparison switch is unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added a focused assertion rejecting the duplicate post-label declaration and preserving the compare-size assignment sequence.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

|| Command | Result |
|---|---|
|| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 22 sources compiled; first stable diagnostic was `arraymodule.c(768) : error C2143: syntax error : missing ';' before 'type'` for the duplicate `int cmp;`; later independent blockers began at lines 920, 924, 1166, 1489, 1547, 1736, 1897, 2816, 2862, 2907, 2960, 3008, and 3095; summary `total=23 compiled=22 cached=0 skipped=0`. |
|| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit | exit 1 as required by TDD; `array_richcompare compare_sizes retains duplicate cmp declaration`. |
|| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | exit 0; `ALL TESTS PASSED`. |
|| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit | exit 2; the line-768 duplicate declaration blocker cleared. The next first stable diagnostics are the separate `arraymodule.c(920)` C89 declaration-order family (`const` after executable statements), followed by later declaration, initializer, string-size, and API-call blockers; summary `total=23 compiled=22 cached=0 skipped=0`. |
|| full applicable regression suite and source checks: `bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check` | exit 0; all suites reported `ALL TESTS PASSED`. |
|| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch && git -C cpython diff --check` | exit 0; patch regenerated and nested source diff clean. |
|| pristine detached `v3.11.16` temporary worktree plus `git apply --check` | exit 0; compatibility patch applies cleanly; temporary worktree removed. |

**Current compile-frontier state:** `array_richcompare()` now compiles past the duplicate `cmp` declaration under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is the separate `arraymodule.c(920)` declaration-order family. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`arraymodule.c` `array_richcompare` compare-size locals slice)

Date: 2026-09-14 23:19 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`; the nested `cpython/` checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains an external/local-only prerequisite invoked through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; verified banner: `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded frontier was re-probed first and remained applicable: `_blake2/blake2s_impl.c` compiled cleanly, 22 sources compiled, and `arraymodule.c` remained the first failing source. This run addressed only the C89 declaration-order family for `vs` and `ws` in `array_richcompare()`; the separate duplicate `int cmp` declaration after `compare_sizes:` and all later blockers remain untouched. One focused Codex implementation lane (`codex-cli 0.153.4`) worked in an isolated temporary snapshot; its candidate was inspected and only the requested source shape was applied manually. No independent review is claimed.

- `cpython/Modules/arraymodule.c` — added `vs` and `ws` to the opening declaration group and changed their post-label declaration-with-initializer statements to assignments. Evaluation point, size comparisons, and behavior are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion requiring both locals before executable statements and preserving their assignment sequence.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 22 sources compiled; first stable diagnostics were `arraymodule.c(766)`/`(767)` C89 `Py_ssize_t vs/ws` declarations, followed by the separate `int cmp` declaration at line 768 and later declaration, `long long`, string-size, and initializer families; summary `total=23 compiled=22 cached=0 skipped=0`. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport wine cmd /c 'call ...\\VCVARS32.BAT && cl'` | exit 0; banner `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit | exit 1 as required by TDD; `array_richcompare size locals missing from opening group`. |
| isolated Codex implementation lane in `/tmp/python-win9x-codex-array` | exit 0; changed only the copied `arraymodule.c`; focused source-shape assertion reported `Source shape assertions passed`. No prohibited Git operations. |
| `diff -u cpython/Modules/arraymodule.c /tmp/python-win9x-codex-array/cpython/Modules/arraymodule.c` | exit 1 because the candidate differed only in the requested `vs/ws` declaration and assignment lines; candidate inspected before manual application. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after applying the source edit and correcting the declaration-group matcher | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after the source edit | exit 2; `vs/ws` diagnostics cleared. The next first stable diagnostic is the separate post-label `int cmp` declaration at `arraymodule.c(768)`; summary `total=23 compiled=22 cached=0`. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch && git -C cpython diff --check` | exit 0; compatibility patch regenerated and nested source diff clean. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh` | exit 0; all applicable regression suites and focused frontier assertions reported `ALL TESTS PASSED`. |
| pristine detached `v3.11.16` temporary worktree plus `git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; patch applies cleanly; temporary verification worktree removed. |

**Current compile-frontier state:** `array_richcompare()` now compiles past the `vs/ws` C89 declaration-order family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is the distinct post-label `int cmp` declaration at line 768. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`arraymodule.c` `array_richcompare` fast-path `res` declaration slice)

Date: 2026-09-14 21:12 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`; the nested `cpython/` checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains an external/local-only prerequisite invoked through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; verified banner: `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

The recorded `arraymodule.c` frontier was re-probed first and remained applicable: `_blake2/blake2s_impl.c` and the preceding 21 sources compiled, then the first stable diagnostic was `arraymodule.c(736) : error C2275: 'PyObject' : illegal use of this type as an expression` for the fast-path `PyObject *res` declaration after executable statements. This run addressed only that C89 declaration-order family. A single focused Codex read-only delegation (`codex-cli 0.153.4`) inspected the exact source and recommended reusing the existing opening `res` local; it made no changes. No independent review is claimed.

- `cpython/Modules/arraymodule.c` — changed only `PyObject *res = cmp ? Py_True : Py_False;` to `res = cmp ? Py_True : Py_False;`, reusing the existing declaration at the function opening. Boolean selection, reference counting, and return behavior are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion requiring one opening `res` declaration, no fast-path declaration, and the preserved assignment/incref/return sequence.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 22 sources compiled, then `arraymodule.c(736)` first reported `error C2275: 'PyObject' : illegal use of this type as an expression`; later independent blockers began at lines 766, 921, 925, 1082, 1167, 1490, 1548, 1737, 1898, 2817, 2863, 2908, 2961, 3009, and 3096. Summary `total=23 compiled=22 cached=0 skipped=0`. |
| focused Codex delegation: `codex exec -s read-only --skip-git-repo-check ...` | exit 0; recommended the one-line reuse of the existing `res` declaration and supplied the focused assertion shape. No files changed. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before the source edit | exit 1 as required by TDD; `array_richcompare fast path retains res declaration`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after the source edit | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after the source edit | exit 2; the line-736 `PyObject *res` blocker cleared. The next first stable diagnostics are the separate C89 `Py_ssize_t vs/ws` declarations at lines 766–767, followed by later declaration, `long long`, string-size, and initializer families. Summary `total=23 compiled=22 cached=0 skipped=0`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && git -C cpython diff --check` | exit 0; all applicable regression suites and source checks passed. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport wine cmd /c 'call Z:\\\\home\\\\ubuntu\\\\Organized\\\\Legacy-Ports\\\\Projects\\\\python-win9x\\\\MSVC600\\\\VC98\\\\Bin\\\\VCVARS32.BAT && cl'` | exit 0; compiler banner `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. Wine emitted expected headless-display warnings. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; compatibility patch regenerated. |
| pristine detached `v3.11.16` temporary worktree plus `git apply --check` | exit 0; patch applies cleanly; temporary worktree removed. |

**Current compile-frontier state:** `array_richcompare()` now compiles past the fast-path `res` declaration family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is the separate C89 declaration-order family for `Py_ssize_t vs` and `Py_ssize_t ws` at lines 766–767. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`arraymodule.c` `array_richcompare` C89 `cmp` declaration slice)

Date: 2026-09-14 19:05 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`; the nested `cpython/` checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains an external/local-only prerequisite invoked through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; verified banner: `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. The single focused coding-agent delegation was attempted but failed before launch because the `anthropic` package is unavailable; no child changes or independent review are claimed.

The recorded `arraymodule.c` frontier was re-probed through the preceding `getarrayitem()` fix and remained applicable: 22 sources compiled, then `arraymodule.c` was the first failing source. This run addressed only the C89 declaration-order family for `int cmp` in `array_richcompare()`; later mixed-declaration families in that function remain untouched.

- `cpython/Modules/arraymodule.c` — hoisted `int cmp` into `array_richcompare()`'s opening declaration group and removed only the fast-path declaration after executable statements. The comparison switch, assignments, and return behavior are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion requiring the opening-group declaration and preserving the fast-path comparison assignment sequence.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| focused coding-agent delegation | failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child changes were used. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, with source unchanged | exit 1 as required by TDD; `array_richcompare cmp declaration missing from opening group`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after the source edit | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after the source edit | exit 2; 22 sources compiled and `arraymodule.c` was reached. The `int cmp` blocker cleared. The next first stable diagnostics are `arraymodule.c(736) : error C2275: 'PyObject' : illegal use of this type as an expression` for `PyObject *res` after executable statements, followed by later declaration-order, string-size, and initializer diagnostics; summary `total=23 compiled=22 cached=0 skipped=0`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh` | exit 0. |
| `bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check` | exit 0; all applicable regression suites and source checks passed. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport wine cmd /c 'call Z:\\home\\ubuntu\\Organized\\Legacy-Ports\\Projects\\python-win9x\\MSVC600\\VC98\\Bin\\VCVARS32.BAT && cl'` | exit 0; compiler banner `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. Wine emitted expected headless-display warnings before the banner. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; compatibility patch regenerated. |
| pristine detached `v3.11.16` temporary worktree plus `git apply --check` | exit 0; patch applies cleanly; temporary verification worktree removed. |

**Current compile-frontier state:** `array_richcompare()` now compiles past the `int cmp` C89 declaration-order family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is its separate `PyObject *res` declaration at line 736. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`arraymodule.c` duplicate `getarrayitem` declaration slice)

Date: 2026-09-14 16:58 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`; the nested `cpython/` checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains an external/local-only prerequisite invoked through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; verified banner: `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. The single focused coding-agent delegation was attempted for frontier guidance but failed before launch because the `anthropic` package is unavailable; no child changes or independent review are claimed.

The recorded `arraymodule.c` frontier was not still true on re-probe: `_blake2/blake2s_impl.c` and the earlier sources compiled, but `getarrayitem()` still contained a duplicate `arrayobject *ap` declaration after the debug-only assertion. This run therefore followed the actual first stable blocker and addressed only that duplicate/C89 declaration-order family. The previously recorded `int cmp` frontier was not changed in this slice.

- `cpython/Modules/arraymodule.c` — removed the duplicate post-`#endif` `arrayobject *ap` declaration; retained the opening declaration, later assignment, assertion, and item access unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — strengthened the existing `getarrayitem()` regression assertion to require exactly one `ap` declaration and the preserved assignment form.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 22 sources compiled; first stable diagnostics were `arraymodule.c(633) : error C2143` at the duplicate `arrayobject *ap`, followed by parser/cascade diagnostics; summary `total=23 compiled=22 cached=0 skipped=0`. |
| focused coding-agent delegation | failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child changes were used. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the duplicate-declaration assertion, before the source edit | exit 1 as required by TDD; `getarrayitem ap declaration is duplicated`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after the source edit and assertion-boundary correction | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after the source edit | exit 2; the duplicate `getarrayitem()` blocker cleared. The next first stable diagnostic is the separate `arraymodule.c(726) : error C2143` for `int cmp` after executable statements; summary `total=23 compiled=22 cached=0 skipped=0`. |
| `bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check` | exit 0; all applicable regression suites and source checks passed. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh` | exit 0. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; compatibility patch regenerated. |
| pristine detached `v3.11.16` worktree plus `git apply --check` | exit 0; patch applies cleanly; temporary verification worktree removed. |

**Current compile-frontier state:** `getarrayitem()` now compiles past the duplicate declaration under MSVC6 (`cl.exe 12.00.8804`) through Wine. The next narrow frontier is the separate `array_richcompare()` `int cmp` C89 declaration-order family at line 726. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`arraymodule.c` `getarrayitem` C89 declaration-order slice)

Date: 2026-09-14 14:49 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`; the nested `cpython/` checkout remains detached with all existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains an external/local-only prerequisite invoked through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; verified compiler banner: `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. The required single focused coding-agent delegation was attempted but failed before launch because the `anthropic` package is unavailable; no child changes or independent review are claimed.

The recorded frontier was re-probed first and remained true: `_blake2/blake2s_impl.c` compiled cleanly, and `arraymodule.c` remained the first failing source after 22 compiled sources. The first stable diagnostic was the C89 declaration-order error at `arraymodule.c(632)` for `arrayobject *ap` after the debug-only executable assertion. This run addressed only that one declaration-order family.

- `cpython/Modules/arraymodule.c` — hoisted `arrayobject *ap` before the `#ifndef NDEBUG` assertion block; preserved the assignment, assertion, bounds check, and item access behavior.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion requiring the `ap` declaration before the debug block and preserving the assignment form.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `WINEPREFIX=/home/ubuntu/.wine-win9xport wine cmd /c 'call ...\\VCVARS32.BAT && cl'` | exit 0; compiler banner `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. Wine emitted expected headless-display warnings before the banner. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 22 sources compiled; first stable diagnostic `cpython\\Modules\\arraymodule.c(632) : error C2143: syntax error : missing ';' before 'type'`; summary `total=23 compiled=22 cached=0 skipped=0`. |
| focused coding-agent delegation | failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child changes were used. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit | exit 1 as required by TDD; `getarrayitem ap declaration is not before debug block`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit | exit 2; `getarrayitem()` advanced past the blocker. The next first stable diagnostic is the separate C89 declaration-order family at `arraymodule.c(727)`, `int cmp` after executable statements; summary `total=23 compiled=22 cached=0 skipped=0`. |
| `bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check` | exit 0; all applicable regression suites and source checks passed. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh` | exit 0. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; compatibility patch regenerated. |
| first patch verification using `git -C build/verify-vc6-patch-worktree apply --check` | exit 128 due to an incorrect relative worktree path; no source was modified, and the temporary worktree was removed. |
| corrected pristine detached `v3.11.16` temporary worktree plus `git apply --check` | exit 0; patch applies cleanly; temporary worktree removed. |

**Current compile-frontier state:** `arraymodule.c` now compiles past `getarrayitem()`'s C89 declaration-order family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is the separate `int cmp` declaration-order family at line 727. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`arraymodule.c` q/QQ descriptor-width type spelling slice)

Date: 2026-09-14 12:43 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`; the nested `cpython/` checkout remains detached with all existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains an external/local-only prerequisite invoked through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; verified compiler banner: `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. The single focused coding-agent delegation was attempted for frontier implementation guidance but failed before launch because the `anthropic` package is unavailable; no child changes or independent review are claimed.

The recorded `arraymodule.c` frontier was re-probed first and remained true: 22 sources compiled, then the q/QQ descriptor entries reported `error C2632: 'long' followed by 'long' is illegal` at lines 572–573. This run addressed only that `sizeof(long long)` type-spelling family.

- `cpython/Modules/arraymodule.c` — changed only the q/QQ descriptor item-width expressions from `sizeof(long long)` to `sizeof(PY_LONG_LONG)`. Descriptor widths, typecodes, handlers, and behavior are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion requiring VC6-compatible q/QQ descriptor widths and rejecting the original `sizeof(long long)` forms.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 22 sources compiled; first stable diagnostics were `arraymodule.c(572)` and `(573)`, `error C2632: 'long' followed by 'long' is illegal`; later diagnostics began at `arraymodule.c(632)` with C89 mixed declarations; summary `total=23 compiled=22 cached=0 skipped=0`. |
| focused coding-agent delegation | failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child changes were used. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit | exit 1 as required by TDD; `q descriptor does not use VC6-compatible 64-bit width`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit | exit 2; q/QQ `sizeof(long long)` diagnostics cleared. The next first stable diagnostics are the separate C89 declaration-order family beginning at `arraymodule.c(632)`, followed by later declaration, initializer, and string-size families; summary `total=23 compiled=22 cached=0 skipped=0`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check` | exit 0 for every command; all applicable regression suites and source checks passed. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; compatibility patch regenerated from the complete nested checkout. |
| regenerated patch applied with `git -C build/verify-vc6-patch-worktree apply --check` to detached baseline `v3.11.16` | exit 0; temporary verification worktree removed. |

**Current compile-frontier state:** the q/QQ descriptor widths now compile past their `sizeof(long long)` keyword family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is the separate C89 declaration-order family beginning in `arraymodule.c` at line 632. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`arraymodule.c` `DEFINE_COMPAREITEMS` 64-bit type-argument slice)

Date: 2026-09-14 10:37 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`; the nested `cpython/` checkout remains detached with its existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains an external/local-only prerequisite, invoked through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified compiler is `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. The single focused coding-agent delegation was attempted but failed before launch because the `anthropic` package is unavailable; no child changes or independent review are claimed.

The recorded `arraymodule.c` frontier was re-probed first and remained true: 22 sources compiled, then VC6 reported the first stable `long long` type-argument diagnostics in the `DEFINE_COMPAREITEMS(q, ...)` and `DEFINE_COMPAREITEMS(QQ, ...)` macro invocations at lines 554–555. This run addressed only that macro-argument spelling family; later `sizeof(long long)` and declaration-order families remain untouched.

- `cpython/Modules/arraymodule.c` — changed only the `q` and `QQ` `DEFINE_COMPAREITEMS` type arguments to `PY_LONG_LONG` and `unsigned PY_LONG_LONG`, respectively. The macro body and comparison behavior are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion requiring both VC6-compatible macro arguments and rejecting the original `long long` spellings.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `WINEPREFIX=/home/ubuntu/.wine-win9xport wine cmd /c 'call ...\\VCVARS32.BAT && cl'` | exit 0; compiler banner `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 22 sources compiled; first stable diagnostics were `arraymodule.c(554)` and `(555)`, `error C2632: 'long' followed by 'long' is illegal`, followed by later `sizeof(long long)` diagnostics at `(572)` and `(573)`; summary `total=23 compiled=22 cached=0 skipped=0`. |
| focused coding-agent delegation | failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child changes were used. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit | exit 1 as required by TDD; `signed q compare macro argument is not VC6-compatible`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit | exit 2; the macro-invocation `long long` diagnostics at `(554)` and `(555)` cleared. The next first stable diagnostics are the separate `sizeof(long long)` family at `(572)` and `(573)`, followed by later declaration-order and initializer families; summary `total=23 compiled=22 cached=0 skipped=0`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check` | exit 0 for every command; all applicable regression suites and source checks passed. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; compatibility patch regenerated from the nested checkout. |

**Current compile-frontier state:** the `DEFINE_COMPAREITEMS` q/QQ macro invocations now compile past their `long long` keyword family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is the separate `sizeof(long long)` family in the `arraymodule.c` descriptor table. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`arraymodule.c` `DEFINE_COMPAREITEMS` C89 loop-declaration slice)

Date: 2026-09-14 08:30 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`; the nested `cpython/` checkout remains detached with its existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains an external/local-only prerequisite, invoked through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified compiler is `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. The single focused coding-agent delegation was attempted but failed before launch because the `anthropic` package is unavailable; no child changes or independent review are claimed.

The recorded `arraymodule.c` frontier was re-probed first and remained true: 22 sources compiled, then VC6 failed at `DEFINE_COMPAREITEMS` invocation line 544 because the macro expanded `for (Py_ssize_t i = 0; ...)`. This run addressed only that C89 loop-declaration family.

- `cpython/Modules/arraymodule.c` — added `Py_ssize_t i;` to `DEFINE_COMPAREITEMS`'s declaration group and changed the loop to `for (i = 0; ...)`. Comparison order, bounds, increment, and return behavior are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion requiring the C89-safe macro declaration and loop form.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 22 sources compiled; first stable diagnostics were the C89 `for (Py_ssize_t i = ...)` expansion at `arraymodule.c(544)` with `error C2143`, followed by parser fallout; summary `total=23 compiled=22 cached=0 skipped=0`. |
| focused coding-agent delegation | failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child changes were used. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit | exit 1 as required by TDD; `arraymodule compare macro loop counter declaration missing`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit | exit 2; the C89 loop-declaration blocker cleared. The next first stable diagnostics are the separate `long long` macro-type arguments at `arraymodule.c(554)`, `(555)`, `(572)`, and `(573)`, followed by later declaration-order and initializer families; summary `total=23 compiled=22 cached=0 skipped=0`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check` | exit 0 for every command; all applicable regression suites and source checks passed. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; compatibility patch regenerated from the nested checkout only. |
| regenerated patch applied with `git -C <pristine-worktree> apply --check` at baseline commit | exit 0; temporary detached verification worktree removed. |

**Current compile-frontier state:** `DEFINE_COMPAREITEMS` now compiles past its C89 loop-declaration family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is the separate `long long` type-argument family in the macro invocations. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`arraymodule.c` q/QQ VC6 64-bit-type spelling slice)

Date: 2026-09-14 06:24 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`; the nested `cpython/` checkout remains detached with its existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains an external/local-only prerequisite, invoked through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified compiler is `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. The single focused coding-agent delegation was attempted but failed before launch because the `anthropic` package is unavailable; no child changes or independent review are claimed.

The recorded `arraymodule.c` frontier was re-probed first and remained true: 22 sources compiled, then VC6 reported the first stable `long long` keyword diagnostics in `q_getitem()`, `q_setitem()`, `QQ_getitem()`, and `QQ_setitem()` at lines 449–491. This run addressed only that active signed/unsigned 64-bit type-spelling family, using the existing `PY_LONG_LONG` abstraction.

- `cpython/Modules/arraymodule.c` — replaced the live `long long` and `unsigned long long` declarations/casts in the q/QQ handlers with `PY_LONG_LONG` and `unsigned PY_LONG_LONG`. Function calls, widths, pointer casts, conversion behavior, and control flow are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion requiring both VC6-compatible spellings and rejecting live `long long` keywords in that handler family.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 22 sources compiled; first stable diagnostics were `arraymodule.c(449)`, `(455)`, `(459)`, `(467)`, `(473)`, `(484)`, and `(491)`, `error C2632: 'long' followed by 'long' is illegal`; summary `total=23 compiled=22 cached=0 skipped=0`. |
| focused coding-agent delegation | failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child changes were used. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit | exit 1 as required by TDD; `arraymodule q/QQ handlers use VC6-compatible 64-bit type spellings` failed. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit | exit 2; q/QQ `long long` diagnostics cleared. The next first stable blocker is the separate C89 `for (Py_ssize_t i = ...)` family in `DEFINE_COMPAREITEMS` at `arraymodule.c(544)`; remaining later diagnostics include the macro's `long long` type arguments and additional declaration-order errors. Summary `total=23 compiled=22 cached=0 skipped=0`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh; bash scripts/vc6-probe.test.sh; bash scripts/vc6-probe-core.test.sh; bash scripts/vc6-probe-pathcch.test.sh; bash scripts/generate-getpath-frozen.test.sh; bash scripts/vc6-probe-stdint.test.sh; bash scripts/vc6-probe-pythoncore-frontier.test.sh; git -C cpython diff --check` | exit 0 for every command; all applicable regression suites and source checks passed. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; compatibility patch regenerated from the nested checkout only. |
| regenerated patch applied with `git -C <pristine-worktree> apply --check` at baseline commit | exit 0; temporary detached verification worktree removed. |

**Current compile-frontier state:** the q/QQ handlers now compile past their live `long long` keyword family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is the separate C89 loop-declaration family in `DEFINE_COMPAREITEMS` at `arraymodule.c(538)`, first surfaced at invocation line 544. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`arraymodule.c` `u_setitem` C89 declaration-order slice)

Date: 2026-09-14 04:17 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`; the nested `cpython/` checkout remains detached with its existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains an external/local-only prerequisite, invoked through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; the verified compiler banner is `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. The required single focused coding-agent delegation was attempted but failed before launch because the `anthropic` package is unavailable; no child changes or independent review are claimed.

The recorded frontier was re-probed first and remained true: 22 sources compiled, then `Modules/arraymodule.c` was the first failing source. This run addressed only the C89 mixed-declaration family in `u_setitem()` at the `len` and `w` locals.

- `cpython/Modules/arraymodule.c` — hoisted `Py_ssize_t len` and `wchar_t w` into `u_setitem()`'s declaration group; changed the first declaration-with-initializer to an assignment and removed the later `w` declaration. The `PyUnicode_AsWideChar()` call order and error/control-flow behavior are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion requiring the C89-safe declarations and preserving both `u_setitem()` conversion calls.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 22 sources compiled; first blocker `arraymodule.c(265)` reported `error C2275: 'Py_ssize_t' : illegal use of this type as an expression`, with the related `wchar_t` declaration at line 272 and later cascade diagnostics; summary `total=23 compiled=22 cached=0 skipped=0`. |
| focused coding-agent delegation | failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child changes were used. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before the source edit | exit 1 as required by TDD; `arraymodule u_setitem uses C89 declaration-order-safe len and w locals` failed. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after the source edit | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after the source edit | exit 2; `arraymodule.c` passed the `u_setitem()` family. The next first stable blocker is the separate `long long` family at lines 449, 455, 459, 467, 473, 484, and 491, followed by C89 `for`-initializer diagnostics; summary `total=23 compiled=22 cached=0 skipped=0`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh; bash scripts/vc6-probe.test.sh; bash scripts/vc6-probe-core.test.sh; bash scripts/vc6-probe-pathcch.test.sh; bash scripts/generate-getpath-frozen.test.sh; bash scripts/vc6-probe-stdint.test.sh; bash scripts/vc6-probe-pythoncore-frontier.test.sh; git -C cpython diff --check` | exit 0 for every command; all applicable regression suites and source checks passed. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; compatibility patch regenerated. |
| regenerated patch applied with `git apply --check` to a pristine detached `v3.11.16` worktree | exit 0; temporary worktree removed. |

**Current compile-frontier state:** `arraymodule.c` now compiles past `u_setitem()`'s C89 declaration-order family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is the separate `long long` family in `arraymodule.c`. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.


## Latest revision (`_struct.c` PyModuleDef positional-initializer slice)

Date: 2026-09-14 02:10 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`; the nested `cpython/` checkout remains detached with existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains an external/local-only prerequisite, invoked through Wine with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; compiler banner remains `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. The single focused coding-agent delegation was attempted but failed before launch because the `anthropic` package is unavailable; no child changes or independent review are claimed.

The recorded `_blake2/blake2s_impl.c` state was re-probed first and was no longer the live frontier: it compiled cleanly. The actual first blocker was `_struct.c(2484)`, a C99 designated initializer. This run addressed only that initializer family.

- `cpython/Modules/_struct.c` — converted `_structmodule` to positional `PyModuleDef` initialization in declared field order (`m_base`, `m_name`, `m_doc`, `m_size`, `m_methods`, `m_slots`, `m_traverse`, `m_clear`, `m_free`). Values and behavior are preserved.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion requiring the exact positional initializer and rejecting designated fields.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; `_blake2/blake2s_impl.c` compiled cleanly and `_struct.c(2484)` reported `error C2059: syntax error : '.'`; summary `total=21 compiled=20 cached=0 skipped=0`. |
| Focused coding-agent delegation | failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child changes were used. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit | exit 1 as required by TDD; `_structmodule positional initializer mismatch`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit | exit 2; `_struct.c` compiled cleanly. The first blocker advanced to `Modules/arraymodule.c(265)`, beginning with `error C2275: 'Py_ssize_t' : illegal use of this type as an expression`, followed by C89 mixed declarations, `long long`, and other diagnostics; summary `total=23 compiled=22 cached=0 skipped=0`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && git -C cpython diff --check` | exit 0; all applicable regression suites passed. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; compatibility patch regenerated. |
| regenerated patch applied with `git apply --check` to a pristine detached `v3.11.16` worktree | exit 0; temporary worktree removed. |

**Current compile-frontier state:** `_struct.c` now compiles cleanly under MSVC6 (`cl.exe` 12.00.8804) through Wine, advancing the frontier to `Modules/arraymodule.c`. This is compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`_struct.c C89 declaration-order frontier slice`)

Date: 2026-09-14 00:04 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`; the nested `cpython/` checkout remains detached with its existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains an external/local-only prerequisite, invoked through Wine on Linux with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; verified compiler banner remains `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. The required single focused coding-agent delegation was attempted, but the delegation runtime failed before launch because the `anthropic` package is unavailable; no child changes or independent review are claimed.

The recorded frontier was re-probed first and remained true: `_blake2/blake2s_impl.c` compiled cleanly, and `_struct.c` was the first failing source. This run addressed only the C89 declaration-order family at `s_new()`, `s_dealloc()`, and `s_pack()`; the later designated initializer remains untouched.

- `cpython/Modules/_struct.c` — hoisted `alloc_func` in `s_new()`, `tp` and `free_func` in `s_dealloc()`, and `writer` in `s_pack()` into declaration groups before executable statements; preserved each initializer's original execution point and all control flow/refcount behavior.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added focused TDD assertions covering all three functions.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 20 sources compiled, then `_struct.c` reported the first stable C89 declaration-order blockers at lines 1447, 1530, and 1923. |
| Focused coding-agent delegation | failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child changes were used. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding assertions, before source edits | exit 1 as required by TDD; the new assertion failed with `s_new: declaration not hoisted`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edits | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edits | exit 2; `_struct.c` compiled cleanly (no `_struct.c` diagnostics), and the first blocker advanced to the separate designated initializer at `_struct.c(2484)`; summary `total=21 compiled=20 cached=0 skipped=0`. |
| `bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh` | exit 0; all applicable regression suites reported `ALL TESTS PASSED`. |
| `git -C cpython diff --check && bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh` | exit 0. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; compatibility patch regenerated. |
| regenerated patch applied with `git apply --check` to a clean detached `v3.11.16` temporary worktree | exit 0; temporary worktree removed. |

**Current compile-frontier state:** `_struct.c` now compiles past the C89 declaration-order family under MSVC6 through Wine. The next narrow frontier is the separate C99 designated initializer at line 2484. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`_struct.c` MSVC6 `long long` keyword compatibility slice)

Date: 2026-09-13 21:58 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`; the nested `cpython/` checkout remains detached with its existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains an external/local-only prerequisite, invoked through Wine on Linux with `WINEPREFIX=/home/ubuntu/.wine-win9xport`; verified compiler banner: `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. The single requested coding-agent implementation attempt was made but could not start because the delegation runtime lacks the `anthropic` package; no child changes or independent review are claimed.

The recorded frontier was re-probed first and remained true: `_blake2/blake2s_impl.c` compiled cleanly, and `_struct.c` was the first failing source. This run addressed only the distinct `long long` keyword family. The later `_struct.c` declaration-order and designated-initializer blockers remain untouched.

- `cpython/Modules/_struct.c` — replaced live signed `long long` spellings with `PY_LONG_LONG`, live unsigned spellings with `unsigned PY_LONG_LONG`, and updated the two sign-extension casts and native-size calculations. Integer widths and runtime operations are unchanged; comments and user-facing format documentation retain their original wording.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion that strips comments/module documentation and rejects live `long long` keywords while requiring the complete `PY_LONG_LONG` replacement family.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 20 sources compiled, then `_struct.c` reported the first stable `error C2632: 'long' followed by 'long' is illegal` family at lines 103, 211, 213, 221, 234, 236, 244, 493, 501, 702, 712, 801–802, 843, 851, 858, 1064, 1072, and 1079. Later independent blockers were at 1447/1530/1923 and 2480. Summary `total=21 compiled=20 cached=0 skipped=0`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before the source edit | exit 1 as required by TDD; the new `_struct` assertion failed. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after the source edit and assertion matcher corrections | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after the source edit | exit 2; all `_struct.c` `long long` diagnostics cleared. The first stable blocker advanced to `_struct.c(1447)` C89 declaration ordering, followed by 1530/1923 declaration-order diagnostics and the designated initializer at 2480. Summary `total=21 compiled=20 cached=0 skipped=0`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh` plus public/core/PathCch/getpath/stdint/frontier regression suites | exit 0; every applicable suite reported `ALL TESTS PASSED`. |
| `git -C cpython diff --check` | exit 0. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; compatibility patch regenerated. |
| regenerated patch applied with `git apply --check` to a pristine detached `v3.11.16` worktree | exit 0; temporary worktree removed. |

**Current compile-frontier state:** `_struct.c` now compiles past the `long long` keyword family under MSVC6 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is `_struct.c`'s C89 declaration-order family at lines 1447, 1530, and 1923. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`_struct.c` MSVC6 `_Bool` compatibility slice)

Date: 2026-09-13 19:48 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`; the nested `cpython/` checkout remains detached with its existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. The compiler banner remains `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`, invoked through Wine on Linux with `WINEPREFIX=/home/ubuntu/.wine-win9xport`.

The recorded `_blake2/blake2s_impl.c` state was re-probed first and was no longer the live frontier: `_blake2s_impl.c` compiled cleanly. The actual first stable blocker was `_struct.c`; this run addressed only the missing C99 `_Bool` defect family. A single focused Codex implementation lane ran in an isolated temporary snapshot; its candidate was inspected and copied manually. No independent review is claimed.

- `cpython/Modules/_struct.c` — added a guarded MSVC6-only `typedef unsigned char _Bool;`, preserving the one-byte layout required by the module's native `?` format handling. No other `_struct.c` defect family was changed.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion for the guarded one-byte typedef.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 20 sources compiled, then `_struct.c` first reported `_Bool` syntax/undeclared diagnostics at lines 85, 94, 504, 719, and related fallout. Summary `total=21 compiled=20 cached=0 skipped=0`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before the source edit | exit 1 as required by TDD; `_struct provides a guarded one-byte VC6 _Bool compatibility typedef` failed. |
| focused Codex implementation lane in `/tmp/python-win9x-codex-struct` | exit 0; changed only `cpython/Modules/_struct.c`; its focused test ended with `ALL TESTS PASSED`. Candidate diff was inspected before manual application. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after the source edit | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after the source edit | exit 2; all `_Bool` diagnostics cleared. The first stable blocker remains `_struct.c`'s separate `long long` keyword family, followed by C89 mixed declarations at lines 1447/1530/1923 and a designated initializer at line 2480. Summary `total=21 compiled=20 cached=0 skipped=0`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check` | exit 0; all applicable regression suites and source diff checks passed. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; patch regenerated. Existing generated patch payload retains its previously documented trailing-whitespace lines. |
| regenerated patch applied with `git apply --check` to a pristine detached `v3.11.16` worktree | exit 0; temporary worktree removed. |

**Current compile-frontier state:** `_blake2/blake2s_impl.c` and `_struct.c` through the `_Bool` family compile past this slice under MSVC 6.0 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is `_struct.c`'s `long long` keyword compatibility family. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`_stat.c` `statmodule` positional-initializer slice)

Date: 2026-09-13 17:40 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`; the nested `cpython/` checkout remains detached with its existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. The required focused coding-agent delegation could not start because the delegation runtime requires the unavailable `anthropic` package; implementation and verification were performed directly, with no independent review claimed. The MSVC6 banner remains `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`, invoked through Wine on Linux.

The recorded `_stat.c` state was re-probed first and remained true: 19 sources compiled, then VC6 reported only the `statmodule` C99 designated initializer at line 635. This run addressed only that designated-initializer defect family.

- `cpython/Modules/_stat.c` — converted `statmodule` to positional `PyModuleDef` initialization in declared field order (`m_base`, `m_name`, `m_doc`, `m_size`, `m_methods`, `m_slots`, `m_traverse`, `m_clear`, `m_free`). The previously implicit trailing fields are explicitly `NULL`; names, values, and module behavior are preserved.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion requiring the exact positional initializer and rejecting designated fields.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 19 sources compiled; `_stat.c(635)` reported `error C2059: syntax error : '.'`; summary `total=20 compiled=19 cached=0 skipped=0`. |
| focused coding-agent delegation | not started; runtime reported `The 'anthropic' package is required for the Anthropic provider`; no child changes were used. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before the source edit | exit 1 as required by TDD; `statmodule positional initializer mismatch`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after the source edit | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after the source edit | exit 2; `_stat.c` compiled cleanly and the first stable blocker advanced to `_struct.c`; summary `total=21 compiled=20 cached=0 skipped=0`. First `_struct.c` diagnostics include undeclared/unsupported `_Bool`, illegal `long long`, declaration-order errors, and a later designated initializer at line 2475. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check` | exit 0; all applicable regression suites, shell syntax checks, and nested source diff checks passed. |
| `bash scripts/vc6-probe-core.sh cpython/Modules/main.c && bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c` | exit 0 for both compile probes. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; compatibility patch regenerated. |
| regenerated patch applied with `git apply --check` to a pristine detached `v3.11.16` worktree | exit 0; temporary worktree removed. |

**Current compile-frontier state:** `_stat.c` now compiles cleanly under MSVC 6.0 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is `_struct.c`, beginning with its `_Bool`/`long long` compatibility diagnostics. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`_stat.c` Win9x/VC6 header-constant availability slice)

Date: 2026-09-13 15:33 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`; the nested `cpython/` checkout remains detached with its existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. The MSVC6 banner remains `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`, invoked through Wine on Linux. One focused Codex implementation lane (`codex-cli 0.153.4`) used an isolated temporary worktree; its candidate was inspected and the narrow source change was applied to the real checkout. No independent review is claimed.

The recorded `_blake2/blake2s_impl.c` state was re-probed first and remained clean. The actual first stable blocker was `_stat.c`: the VC6 headers lacked `FILE_ATTRIBUTE_DEVICE`, `FILE_ATTRIBUTE_VIRTUAL`, and `IO_REPARSE_TAG_SYMLINK`. This run addressed only that header-constant availability family; the later `_stat.c` designated initializer remains untouched.

- `cpython/Modules/_stat.c` — added guarded fallbacks in the existing `MS_WINDOWS` section: `FILE_ATTRIBUTE_DEVICE 0x0040`, `FILE_ATTRIBUTE_VIRTUAL 0x10000`, and `IO_REPARSE_TAG_SYMLINK 0xA000000CL`. The `#ifndef` guards preserve any definitions supplied by a newer Windows header.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion requiring all three guarded definitions and exact values.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

|| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 19 sources compiled; `_stat.c(580)`, `(594)`, and `(597)` reported undeclared `FILE_ATTRIBUTE_DEVICE`, `FILE_ATTRIBUTE_VIRTUAL`, and `IO_REPARSE_TAG_SYMLINK`, followed by the designated-initializer error at line 622; summary `total=20 compiled=19 cached=0 skipped=0`. |
| isolated `codex exec -s workspace-write --skip-git-repo-check ...` implementation lane | exit 0; its focused assertion produced RED exit 1 naming all three missing guards, then GREEN exit 0 after the candidate edit. Its attempted VC6 probe was blocked before compilation by Wine `wineserver: mkdir /run/user/1000/wine/...: Read-only file system`; no child changes were copied automatically. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the focused assertion, before the source edit | exit 1 as required by TDD; `_stat provides guarded VC6/Win9x file-attribute fallbacks` failed with `FILE_ATTRIBUTE_DEVICE`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after the source edit | exit 0; all focused assertions passed. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after the source edit | exit 2; `_stat.c` advanced past the three missing-constant diagnostics. The next first stable blocker is the separate C99 designated initializer at `_stat.c(635)`; summary `total=20 compiled=19 cached=0 skipped=0`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh; bash scripts/vc6-probe.test.sh; bash scripts/vc6-probe-core.test.sh; bash scripts/vc6-probe-pathcch.test.sh; bash scripts/generate-getpath-frozen.test.sh; bash scripts/vc6-probe-stdint.test.sh; bash scripts/vc6-probe-pythoncore-frontier.test.sh; git -C cpython diff --check` | exit 0; all applicable regression suites, shell syntax checks, and nested source diff checks passed. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; compatibility patch regenerated. |
| regenerated patch applied with `git apply --check` to a pristine temporary detached `v3.11.16` worktree | exit 0; temporary worktree removed. |

**Current compile-frontier state:** `_stat.c` now compiles past the missing Win9x/VC6 header-constant family under MSVC 6.0 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is `_stat.c`'s `PyModuleDef` C99 designated initializer at line 635. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.


## Latest revision (`_stat.c` `stat_exec` C89 declaration-order slice)

Date: 2026-09-13 13:27 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`; the nested `cpython/` checkout remains detached with its existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. One focused Codex read-only delegation (`codex-cli 0.153.4`) inspected this exact frontier and recommended the minimal slice; it made no changes. No independent review is claimed.

The recorded `_sre/sre.c` frontier was re-probed before editing and remained clear. The actual first stable blocker was `Modules/_stat.c`: `stat_exec()` declared `st_constants` and the `for` loop counter after executable `ADD_INT_MACRO` calls, producing VC6/C89 declaration-order diagnostics at lines 557 and 570. This run made only that one defect-family fix; the later missing Win32 constants and designated initializer remain untouched.

- `cpython/Modules/_stat.c` — moved the unchanged `st_constants` table and an `int i` declaration into `stat_exec()`'s opening declaration group; changed the loop to use `for (i = 0; ...)`. Constant order, assigned values, registration order, and immediate error returns are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion requiring the table and loop counter before the first executable macro call and rejecting the C99 loop declaration.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

|| Command | Result |
|---|---|
|| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 19 sources compiled; `_stat.c(557)` and `(570)` reported C89 mixed-declaration errors, followed by parser fallout and missing `FILE_ATTRIBUTE_DEVICE`, `FILE_ATTRIBUTE_VIRTUAL`, and `IO_REPARSE_TAG_SYMLINK`, plus the later designated-initializer error at line 621; summary `total=20 compiled=19 cached=0 skipped=0`. |
|| `codex exec -s read-only --skip-git-repo-check ...` focused frontier inspection | exit 0; recommended moving `st_constants` and hoisting `int i`; no files changed. |
|| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the focused assertion, before the source edit | exit 1 as required by TDD after correcting the assertion's extraction boundary; `_stat stat_exec uses C89 declaration-order-safe constants and loop counter` failed while prior assertions passed. |
|| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after the source edit | exit 0; all focused assertions passed. |
|| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after the source edit | exit 2; `_stat.c` advanced past the C89 declaration-order family. Remaining first diagnostics are missing `FILE_ATTRIBUTE_DEVICE`, `FILE_ATTRIBUTE_VIRTUAL`, and `IO_REPARSE_TAG_SYMLINK`, followed by the `statmodule` designated initializer at line 622; summary `total=20 compiled=19 cached=0 skipped=0`. |
|| `bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check` | exit 0; all applicable regression suites and nested source diff checks passed. |
|| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; compatibility patch regenerated. |
|| regenerated patch applied with `git apply --check` to a pristine temporary detached `v3.11.16` worktree | exit 0; temporary worktree removed. |

**Current compile-frontier state:** `Modules/_stat.c` now compiles past its C89 declaration-order blocker under MSVC 6.0 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is the distinct Win9x/VC6 header-constant availability group (`FILE_ATTRIBUTE_DEVICE`, `FILE_ATTRIBUTE_VIRTUAL`, `IO_REPARSE_TAG_SYMLINK`), followed by the `statmodule` C99 designated initializer. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`_sre/sre.c` `sremodule` PyModuleDef designated-initializer slice)

Date: 2026-09-13 11:20 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`; the nested `cpython/` checkout remains detached with its existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. One focused Codex implementation lane (`codex-cli 0.153.4`) ran in an isolated temporary worktree snapshot; its candidate was reviewed, the temporary worktree was removed, and no independent review is claimed.

The recorded `_sre/sre.c` frontier was re-probed before editing and remained true: 18 sources compiled, then VC6 reported the `sremodule` `PyModuleDef` C99 designated-initializer family at line 3031. This run made only that defect-family fix.

- `cpython/Modules/_sre/sre.c` — converted `sremodule` from designated initializers to positional `PyModuleDef` initialization in declared field order (`m_base`, `m_name`, `m_doc`, `m_size`, `m_methods`, `m_slots`, `m_traverse`, `m_clear`, `m_free`). The previously omitted `m_doc` is explicitly `NULL`; field values, order, and behavior are preserved.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion requiring the exact positional `sremodule` initializer and rejecting designated fields.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 18 sources compiled; `_sre.c(3031)` reported `error C2059: syntax error : '.'` and `','`; summary `total=19 compiled=18 cached=0 skipped=0`. |
| isolated `codex exec -s workspace-write ...` focused implementation lane | exit 0 in a temporary worktree; candidate source edit and an extra upstream test-file change were inspected, but the temporary worktree was removed and only the narrow source shape was applied to the real checkout. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before the source edit | exit 1 as required by TDD; `sremodule positional initializer mismatch` and `not ok - _sre sremodule uses C89-compatible positional initializers`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after the source edit | exit 0; all focused assertions passed. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after the source edit | exit 2; `_sre/sre.c` compiled cleanly and the first stable blocker advanced to `Modules/_stat.c`; first diagnostics include C89 declaration-order errors at lines 557/570, missing `FILE_ATTRIBUTE_DEVICE`, `FILE_ATTRIBUTE_VIRTUAL`, `IO_REPARSE_TAG_SYMLINK`, and a designated-initializer error at line 621; summary `total=20 compiled=19 cached=0 skipped=0`. |
| `bash -n ... && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && git -C cpython diff --check` | exit 0; all applicable regression suites and source diff checks passed. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; compatibility patch regenerated. |
| regenerated patch applied with `git apply --check` to a pristine temporary detached `v3.11.16` worktree | exit 0; temporary worktree removed. |

**Current compile-frontier state:** `_sre/sre.c` now compiles cleanly under MSVC 6.0 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is `Modules/_stat.c`; it must be re-probed and addressed one defect family at a time. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`_sre/sre.c` ADD_ULONG_CONSTANT C89 declaration-order slice)

Date: 2026-09-13 09:10 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`; the nested `cpython/` checkout remains detached with its existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. One focused Codex delegation ran read-only with `codex-cli 0.153.4`; it confirmed the smallest safe slice and made no changes. No independent review is claimed. The relevant legacy-toolchain reference was read from `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md`.

The recorded `_sre/sre.c` designated-initializer frontier was re-probed before editing and was no longer the live first blocker: the actual first stable diagnostics were the C89 mixed declarations inside `ADD_ULONG_CONSTANT` at lines 2982 and 2985. This run made only that one defect-family fix; the later `sremodule` designated initializers remain untouched.

- `cpython/Modules/_sre/sre.c` — changed the macro-local `int res = PyModule_AddObjectRef(...)` to an opening `int res;` declaration followed by assignment after the existing `if (!o) goto error;`. Allocation, NULL handling, module insertion, decref ordering, error jump, both call sites, and behavior are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion requiring the C89-safe macro shape and preserving the operation sequence.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 18 sources compiled; `_sre/sre.c(3011)` and `(3012)` expanded `ADD_ULONG_CONSTANT` and reported C89 declaration-order diagnostics at macro lines 2982 and 2985, followed by parser fallout; summary `total=19 compiled=18 cached=0 skipped=0`. |
| `codex exec -s read-only --skip-git-repo-check "...inspect only the live VC6 frontier..."` | exit 0; read-only analysis identified the minimal `ADD_ULONG_CONSTANT` `res` hoist and no semantic risk; no files changed. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the focused assertion, before the source edit | exit 1 as required by TDD; the new `_sre ADD_ULONG_CONSTANT` assertion failed while prior assertions passed. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after the source edit | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after the source edit | exit 2; the `ADD_ULONG_CONSTANT` diagnostics cleared. The next first stable blocker is `_sre/sre.c(3031)`, the separate `sremodule` C99 designated-initializer family; summary `total=19 compiled=18 cached=0 skipped=0`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && git -C cpython diff --check` | exit 0; all regression suites passed and the nested source diff was clean. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; compatibility patch regenerated. |
| regenerated patch applied with `git apply --check` to a pristine temporary detached `v3.11.16` worktree | exit 0; temporary worktree removed. |

**Current compile-frontier state:** `_sre/sre.c` now compiles past the `ADD_ULONG_CONSTANT` C89 declaration-order defect under MSVC 6.0 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is the separate `sremodule` `PyModuleDef` designated-initializer family at lines 3030–3037. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`_sre/sre.c` PyType_Spec designated-initializer slice)

Date: 2026-09-13 07:04 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`; the nested `cpython/` checkout remains detached with its existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. The required focused coding-agent delegation was attempted, but the delegation runtime could not start because the `anthropic` package is unavailable; no child changes or independent review were used. The relevant legacy-toolchain reference was read from `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md`.

The recorded `_sre/sre.c` frontier was re-probed before editing and remained true: 18 sources compiled, then VC6 reported three C99 designated initializers in `pattern_spec`, `match_spec`, and `scanner_spec` at lines 2826, 2894, and 2924. This run made only that designated-initializer defect-family fix.

- `cpython/Modules/_sre/sre.c` — converted `pattern_spec`, `match_spec`, and `scanner_spec` from C99 designated initializers to positional `PyType_Spec` initializers in declared field order (`name`, `basicsize`, `itemsize`, `flags`, `slots`). The omitted `scanner_spec.itemsize` is explicitly `0`, preserving C99 zero-initialization; values and behavior are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion requiring all three positional initializer blocks and rejecting the old designated form.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 18 sources compiled; `_sre/sre.c` first reported `error C2059: syntax error : '.'` at lines 2826, 2894, and 2924, followed by parser fallout at lines 3010+; summary `total=19 compiled=18 cached=0 skipped=0`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the focused assertion, before the source edit | exit 1 as required by TDD; the new positional-`PyType_Spec` assertion failed with `pattern_spec` while prior assertions passed. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after the source edit | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after the source edit | exit 2; the three `_sre` `PyType_Spec` designated-initializer diagnostics cleared. The next stable blocker is the `_sre/sre.c` `ADD_ULONG_CONSTANT` macro's C89 mixed declarations at lines 2982 and 2985, followed by the `sremodule` `PyModuleDef` designated initializers; summary `total=19 compiled=18 cached=0 skipped=0`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh` plus public/core/PathCch/getpath/stdint/frontier regression suites and `git -C cpython diff --check` | exit 0; every regression suite reported `ALL TESTS PASSED`, and the nested source diff was clean. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; compatibility patch regenerated. |
| regenerated patch applied with `git apply --check` to a pristine temporary detached `v3.11.16` worktree | exit 0; temporary worktree removed. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport wine cmd /c 'call ...\\VCVARS32.BAT && cl'` | exit 0; compiler banner `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. |

**Current compile-frontier state:** the three `_sre/sre.c` `PyType_Spec` designated initializers now compile past VC6/MSVC 6.0 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is the separate `sremodule` `PyModuleDef` designated-initializer family at lines 3030–3037. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`_sre/sre.c` GROUPREF_EXISTS `rc` C89 declaration-order slice)

Date: 2026-09-13 04:58 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`; the nested `cpython/` checkout remains detached with its existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. The required focused coding-agent delegation was attempted, but the delegation runtime could not start because the `anthropic` package is unavailable; no child changes or independent review were used. The relevant local reference was read from `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md`.

The recorded `_sre/sre_lib.h` frontier was re-probed before editing and remained true through that file. The first stable blocker was `_sre/sre.c(1925)`, a C89 declaration-order defect: `int rc = _validate_inner(...)` followed the executable `VTRACE` statement in the `SRE_OP_GROUPREF_EXISTS` case. This run made only that defect-family fix.

- `cpython/Modules/_sre/sre.c` — hoisted `int rc` into `_validate_inner()`'s opening declaration group and changed the later declaration-with-initializer to `rc = _validate_inner(...)`. The assignment timing, validation branches, control flow, and behavior are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added a focused TDD assertion requiring the function-level C89 declaration and assignment shape.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

|| Command | Result |
||---|---|
|| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; 18 sources compiled; `_sre/sre.c(1925)` reported `error C2143: syntax error : missing ';' before 'type'` for `int rc = ...`, followed by `rc` undeclared and later `_sre` diagnostics; summary `total=19 compiled=18 cached=0 skipped=0`. |
|| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the focused assertion, before the source edit | exit 1 as required by TDD; `_sre GROUPREF_EXISTS uses C89 declaration-order-safe rc local` failed while prior assertions passed. |
|| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after the source edit | exit 0; `ALL TESTS PASSED`. |
|| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after the source edit | exit 2; the `rc` blocker cleared and `_sre.c` reached the next distinct blockers: designated initializers at lines 2826, 2894, and 2924, followed by later declaration/designated-initializer diagnostics; summary `total=19 compiled=18 cached=0 skipped=0`. |
|| `bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check` | exit 0; all regression suites passed and the nested source diff was clean. |
|| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; compatibility patch regenerated. |
|| regenerated patch applied with `git apply --check` to a pristine detached `v3.11.16` worktree | exit 0; temporary verification worktree removed. |

**Current compile-frontier state:** `_sre/sre.c` now compiles past the `GROUPREF_EXISTS` `rc` declaration-order defect under MSVC 6.0 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is the separate C99 designated-initializer family at `_sre/sre.c` lines 2826, 2894, and 2924. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`_sre/sre_lib.h` MIN_UNTIL repeat local C89 declaration-order slice)

Date: 2026-09-13 02:48 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`; the nested `cpython/` checkout remains detached with its existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. The required focused coding-agent delegation was attempted with the installed Codex launcher, but the delegation runtime could not start because the `anthropic` package is unavailable; no child changes or independent review were used. The relevant local reference was read from `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md`.

The recorded `_sre/sre_lib.h` frontier was re-probed before editing and remained true: `_sre/sre.c` was the first failing source after 18 compiled sources, with `sre_lib.h(1215) : error C2275: 'SRE_REPEAT' : illegal use of this type as an expression` at `SRE_REPEAT *repeat_of_tail = state->repeat;`. This run made only that one C89 mixed-declaration defect-family fix.

- `cpython/Modules/_sre/sre_lib.h` — hoisted `SRE_REPEAT *repeat_of_tail` into `SRE(match)`'s opening declaration group and changed the later declaration to `repeat_of_tail = state->repeat;`. Assignment timing, repeat restoration, mark-stack handling, control flow, and matching behavior are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added a focused TDD assertion requiring the C89-safe declaration and assignment shape.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; `getpath.c`, `_abc.c`, `_bisectmodule.c`, both `_blake2` implementations, `_codecsmodule.c`, `_collectionsmodule.c`, `_contextvarsmodule.c`, `_csv.c`, `_functoolsmodule.c`, `_heapqmodule.c`, `_json.c`, `_localemodule.c`, `_lsprof.c`, `_pickle.c`, `_randommodule.c`, and `_sha3/sha3module.c` compiled; `_sre/sre_lib.h(1215)` reported `error C2275: 'SRE_REPEAT' : illegal use of this type as an expression`, followed by `repeat_of_tail` undeclared and later `_sre.c` diagnostics; summary `total=19 compiled=18 cached=0 skipped=0`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the focused assertion, before the source edit | exit 1 as required by TDD; `_sre MIN_UNTIL uses C89 declaration-order-safe repeat local` failed while prior assertions passed. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after the source edit and assertion-boundary correction | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after the source edit | exit 2; the `sre_lib.h(1215)` blocker cleared. The next first stable blockers are `_sre/sre.c(1925)` C89 declaration-order (`rc`), then designated initializers at lines 2825, 2893, 2923, and later declaration/designated-initializer diagnostics; summary `total=19 compiled=18 cached=0 skipped=0`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && git -C cpython diff --check` | exit 0. |
| `bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh` | exit 0; all regression suites reported `ALL TESTS PASSED`. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; compatibility patch regenerated. |
| regenerated patch applied with `git apply --check` to a pristine detached `v3.11.16` worktree | exit 0; temporary verification worktree removed. |

**Current compile-frontier state:** `_sre/sre_lib.h` now compiles past the `MIN_UNTIL` `repeat_of_tail` C89 declaration-order defect under MSVC 6.0 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is `_sre/sre.c(1925)`, the separate C89 mixed-declaration `rc` defect. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`_sre/sre_lib.h` SRE(match) C89 declaration-order slice)

Date: 2026-09-13 00:41 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`; the nested `cpython/` checkout remains detached with its existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. The required focused coding-agent delegation was attempted with Claude Code, but authentication failed with `401 OAuth access token has been revoked`; no child changes or independent review were used. The referenced local `python-3-win9x-msvc6.md` document was not present at the expected skill-reference path.

The recorded `_blake2/blake2s_impl.c` state was re-probed before editing and remained clean, so the actual first stable blocker was followed instead: `_sre/sre_lib.h(586)`, where `SRE(match)` declared `const SRE_CHAR *ptr` after an executable statement and an `entrance:` label, violating VC6/C89 declaration ordering. This run made only that one defect-family fix.

- `cpython/Modules/_sre/sre_lib.h` — added `const SRE_CHAR *ptr;` to `SRE(match)`'s opening declaration group and changed the later declaration to `ptr = (SRE_CHAR *)state->ptr;`. The label, assignment point, control flow, and matching behavior are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added a focused TDD assertion requiring the C89-safe declaration and assignment shape.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; `_blake2/blake2s_impl.c` compiled cleanly, then `_sre/sre.c` reached `_sre/sre_lib.h(586) : error C2143: syntax error : missing ';' before 'const'`, with parser-cascade diagnostics; summary `total=19 compiled=18 cached=0 skipped=0`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the focused assertion, before the source edit | exit 1 as required by TDD after correcting the assertion's extraction boundary; `_sre SRE(match) uses C89 declaration-order-safe ptr local` failed while prior assertions passed. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after the source edit | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after the source edit | exit 2; `_sre/sre_lib.h` cleared the `ptr` declaration-order blocker. The next first stable blocker is `_sre/sre_lib.h(1215) : error C2275: 'SRE_REPEAT' : illegal use of this type as an expression` at `SRE_REPEAT *repeat_of_tail = state->repeat;`, followed by `_sre.c` declaration/designated-initializer errors; summary `total=19 compiled=18 cached=0 skipped=0`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check` | exit 0; all regression suites and nested source diff checks passed. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; compatibility patch regenerated. |
| regenerated patch applied with `git apply --check` to a pristine detached `v3.11.16` worktree | exit 0; temporary verification worktree removed. |

**Current compile-frontier state:** `SRE(match)` now compiles past the line-586 C89 declaration-order defect under MSVC 6.0 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is the separate C89 mixed-declaration `SRE_REPEAT *repeat_of_tail` at `_sre/sre_lib.h(1215)`. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.


## Latest revision (`_sha3/sha3module.c` designated-initializer slice)

Date: 2026-09-12 22:35 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`; the nested `cpython/` checkout remains detached with its existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. The required focused coding-agent delegation was attempted, but the delegation runtime could not start because the `anthropic` package is unavailable; no child changes or independent review were used.

The recorded `_sha3/sha3module.c` state was re-probed before editing and remained true: `SHA3_dealloc()` was already clean, while seven C99 designated initializers in the `SHA3_TYPE_SPEC` macro and `_sha3module` produced VC6 `error C2059: syntax error : '.'` diagnostics. This run made only that designated-initializer defect-family fix.

- `cpython/Modules/_sha3/sha3module.c` — converted `SHA3_TYPE_SPEC` to positional `PyType_Spec` initialization in declared field order (`name`, `basicsize`, explicit `itemsize` zero, `flags`, `slots`), and converted `_sha3module` to positional `PyModuleDef` initialization in declared field order. Values and field order are preserved; no runtime behavior or control flow changed.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion requiring both `_sha3` initializer groups to be positional.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; `_sha3/sha3module.c` was reached after 17 compiled sources and reported seven `error C2059: syntax error : '.'` diagnostics at lines 444, 447, 450, 453, 569, 572, and 651; `total=18 compiled=17 cached=0 skipped=0`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the focused assertion, before the source edit | exit 1 as required by TDD; the new `_sha3` positional-initializer assertion failed while prior assertions passed. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after the source edit | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after the source edit | exit 2; `_sha3/sha3module.c` compiled with no diagnostics and the first blocker advanced to `_sre/sre.c`, beginning with `_sre/sre_lib.h(586) : error C2143: syntax error : missing ';' before 'const'`, followed by parser-cascade diagnostics; `total=19 compiled=18 cached=0 skipped=0`. |
| `bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh` | exit 0; all regression suites reported `ALL TESTS PASSED`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check` | exit 0. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; compatibility patch regenerated. |
| regenerated patch applied with `git apply --check` to a pristine detached `v3.11.16` worktree | exit 0; temporary verification worktree removed. |

**Current compile-frontier state:** `_sha3/sha3module.c` now compiles cleanly under MSVC 6.0 (`cl.exe` 12.00.8804) through Wine. The next narrow frontier is `_sre/sre.c`, whose first stable blocker is the C89 declaration-order defect in `sre_lib.h` at line 586. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`_sha3/sha3module.c` `SHA3_dealloc` C89 declaration-hoist slice)

Date: 2026-09-12 20:28 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`; the nested `cpython/` checkout remains detached with its existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. One focused Codex delegation ran read-only with `codex-cli 0.153.4`; it confirmed the recorded `_blake2/blake2s_impl.c` state was already stale and made no changes. No independent review is claimed.

The recorded `_blake2/blake2s_impl.c` state was re-probed before editing and was no longer the live frontier: `_blake2/blake2s_impl.c` compiled cleanly. The first stable blocker was instead `_sha3/sha3module.c(183)`, where `SHA3_dealloc()` declared `PyTypeObject *tp = Py_TYPE(self);` after executable lock cleanup, violating VC6/C89 declaration ordering. This run made only that one defect-family fix.

- `cpython/Modules/_sha3/sha3module.c` — hoisted `PyTypeObject *tp` into `SHA3_dealloc()`'s opening declaration group and changed the original declaration to `tp = Py_TYPE(self);`. Lock freeing, type lookup timing, object freeing, and type decref order are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion requiring the C89-safe declaration and preserving the cleanup/type/refcount sequence.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

|| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; `_blake2/blake2s_impl.c` compiled cleanly, then `_sha3/sha3module.c(183) : error C2275: 'PyTypeObject' : illegal use of this type as an expression`; designated-initializer diagnostics followed at lines 442, 445, 448, 451, 567, 570, and 649; `total=18 compiled=17 cached=0 skipped=0`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the focused assertion, before the source edit | exit 1 as required by TDD; the new `SHA3_dealloc` assertion failed while prior assertions passed. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after the source edit, before correcting the assertion's sequence matcher | exit 1; the source shape was correct but the newly added matcher incorrectly compared the function body without its signature. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after correcting the assertion | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after the source edit | exit 2; `_sha3/sha3module.c` cleared the `SHA3_dealloc()` blocker. New first blockers are the seven C99 designated initializers in the SHA3 type specs and `_sha3module` (`error C2059: syntax error : '.'`); `total=18 compiled=17 cached=0 skipped=0`. |
| `bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh` | exit 0; all regression suites reported `ALL TESTS PASSED`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check` | exit 0. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; compatibility patch regenerated. |
| regenerated patch applied with `git apply --check` to a pristine detached `v3.11.16` worktree | exit 0; temporary verification worktree removed. |

**Current compile-frontier state:** `SHA3_dealloc()` now compiles cleanly under MSVC 6.0 (`cl.exe` 12.00.8804) through Wine. The next blocker is the separate C99 designated-initializer family in `_sha3/sha3module.c`. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution.

## Latest revision (`_randommodule.c` `_random_exec` C89 declaration-hoist slice)

Date: 2026-09-12 18:22 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`; the nested `cpython/` checkout remains detached with its existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. The required single focused Codex delegation ran read-only with `codex-cli 0.153.4`; it produced analysis only and made no changes. No independent review is claimed.

The recorded `_pickle.c` state was re-probed before editing and remained true through `_pickle.c`; the first stable blocker was the recorded `_randommodule.c(599)` C89 mixed-declaration defect. This run made only that one defect-family fix in `_random_exec()`.

- `cpython/Modules/_randommodule.c` — hoisted `PyObject *longval` and `PyObject *longtype` into `_random_exec()`'s opening declaration group, then changed only their original initializers to assignments. Allocation, NULL checks, `Py_DECREF` order, and error returns are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion requiring C89-safe declarations and preserving the `_random_exec()` allocation/error/refcount sequence.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff` and verified against a pristine `v3.11.16` worktree.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `codex exec -s read-only --skip-git-repo-check "In /home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x, inspect the current CPython v3.11.16 Windows 98/MSVC6 port state without modifying any files. Focus only on the recorded frontier in Modules/_randommodule.c at _random_exec(), especially the C89 mixed-declaration blocker around longval/longtype. Report the smallest evidence-backed edit, the exact focused test assertion that should be added first under strict TDD, and any semantic risks. Do not edit, commit, reset, stash, or push."` | exit 0; read-only focused analysis reported the minimal two-local hoist and no semantic risk beyond preserving initializer timing. No files changed. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before the source edit | exit 1 as required by TDD; `_random_exec uses C89 locals and preserves initialization order` failed while prior assertions passed. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after the source edit | exit 0; `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after the source edit | exit 2; `_randommodule.c` compiled cleanly and the frontier advanced to `_sha3/sha3module.c(183)`, `error C2275: 'PyTypeObject' : illegal use of this type as an expression`, followed by designated-initializer `error C2059` diagnostics at lines 442, 445, 448, 451, 567, 570, and 649; `total=18 compiled=17 cached=0 skipped=0`. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport wine cmd /c 'call Z:\\home\\ubuntu\\Organized\\Legacy-Ports\\Projects\\python-win9x\\MSVC600\\VC98\\Bin\\VCVARS32.BAT && cl'` | exit 0; compiler banner: Microsoft 32-bit C/C++ Optimizing Compiler Version `12.00.8804` for 80x86. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check` | exit 0; all regression suites and nested source diff checks passed. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; compatibility patch regenerated. |
| `git -C cpython worktree add --detach /home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x/build/verify-vc6-patch-worktree v3.11.16 && git -C /home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x/build/verify-vc6-patch-worktree apply --check ../../compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; patch applied cleanly to a pristine detached baseline, and the temporary worktree was removed. |

**Current compile-frontier state:** `_randommodule.c` now compiles cleanly under MSVC 6.0 (`cl.exe` 12.00.8804) through Wine. The next blocker is `_sha3/sha3module.c`'s C89 declaration-order and C99 designated-initializer defects. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution is claimed.

## Latest revision (`_pickle.c` Unpickler_set_memo SIZE_MAX cleanup slice)

Date: 2026-09-12 16:15 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`; the nested `cpython/` checkout remains detached with its existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. The required coding-agent delegation was attempted with the installed Codex CLI, but this CLI rejects the requested `--full-auto` option (exit 2); no child changes or independent review were used.

The recorded `_blake2/blake2s_impl.c` state was re-probed before editing and was no longer the live frontier: the full source-list probe reached `_pickle.c` and reported the distinct missing `SIZE_MAX` blocker. This run therefore made only the actual first-frontier `_pickle.c` fix.

- `cpython/Modules/_pickle.c` — changed `Unpickler_set_memo()` cleanup from `for (i = new_memo_size - 1; i != SIZE_MAX; i--)` to `for (i = new_memo_size; i-- > 0;)`. The loop still decrements through exactly `new_memo_size - 1` to `0`, preserving decref order and cleanup behavior without relying on the unavailable VC6 `SIZE_MAX` definition.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion for the no-`SIZE_MAX` cleanup loop and updated the existing `Unpickler_set_memo()` assertion to require the new C89-safe form.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff` and verified against a pristine `v3.11.16` worktree.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; `total=16 compiled=15 cached=0 skipped=0`; `_pickle.c(7638)`, `error C2065: 'SIZE_MAX' : undeclared identifier`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the new assertion, before the source edit | exit 1 as required by TDD; the new cleanup assertion failed, while prior assertions passed. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after the source edit and test adjustment | exit 0, `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after the source edit | exit 2; `_pickle.c` compiled cleanly and the frontier advanced to `_randommodule.c(599)`, `error C2275: 'PyObject' : illegal use of this type as an expression`; `total=17 compiled=16 cached=0 skipped=0`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check` | exit 0; all regression suites passed and the nested source diff is clean. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; compatibility patch regenerated. |
| pristine detached `v3.11.16` worktree `git -C build/verify-vc6-patch-worktree apply --check ../../compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; temporary verification worktree removed. |

**Current compile-frontier state:** `_pickle.c` now compiles past `Unpickler_set_memo()` under MSVC 6.0 (`cl.exe` 12.00.8804) through Wine. The next blocker is `_randommodule.c` line 599, a C89 mixed-declaration defect. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution is claimed.


## Latest revision (`_pickle.c` Unpickler_set_memo C89 loop-counter slice)

Date: 2026-09-12 14:08 UTC

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`; the nested `cpython/` checkout remains detached with its existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. The required single focused coding-agent delegation was attempted, but could not run because the delegation runtime lacks the `anthropic` package; no child changes or independent review were used.

The recorded frontier was re-probed before editing and remained true: `_pickle.c` compiled through `Unpickler_traverse()`, and the first stable blockers were the two C99 `for (size_t i = ...)` initializers in `Unpickler_set_memo()` at lines 7589 and 7637. The cleanup loop also exposed a separate `SIZE_MAX` undeclared diagnostic after the C99 syntax was removed.

- `cpython/Modules/_pickle.c` — added a function-scoped `size_t i;` declaration and changed only the two `Unpickler_set_memo()` loop initializers to `for (i = ...)`. Loop bounds, decrement behavior, cleanup, refcounting, and assignment timing are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion requiring the shared loop counter and both C89-safe loop forms.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`; it applies cleanly to pristine `v3.11.16`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; `total=16 compiled=15 cached=0 skipped=0`; first blockers `_pickle.c(7589)` and `(7637)` C99 loop declarations, with `SIZE_MAX` also undeclared. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before the source edit | exit 1 as required by TDD; the new `Unpickler_set_memo` assertion failed while prior assertions passed. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after the source edit | exit 0, `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after the source edit | exit 2; both C99 loop diagnostics cleared. New first blocker is `_pickle.c(7638)`, `error C2065: 'SIZE_MAX' : undeclared identifier`; `total=16 compiled=15 cached=0 skipped=0`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.test.sh` plus public/core/PathCch/getpath/stdint/frontier regression suites | exit 0; all suites reported `ALL TESTS PASSED`. |
| `git -C cpython diff --check` | exit 0. |
| `git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch` followed by patch whitespace check | regeneration succeeded; generated patch check exits 2 because existing diff payload contains trailing-whitespace lines, while the nested source diff check is clean. |
| pristine detached `v3.11.16` worktree `git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; temporary verification worktree removed. |

**Current compile-frontier state:** `Unpickler_set_memo()` now compiles past the C99 loop-initializer family under VC6. The next blocker is the distinct missing/unsupported `SIZE_MAX` definition at the cleanup loop. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution is claimed.

## Latest revision (`_pickle.c` Unpickler_traverse C89 declaration-order slice)

Date: 2026-09-12

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`; the nested `cpython/` checkout remains detached with its existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. The required single focused Claude Code delegation was attempted in the existing checkout without permitting edits, but authentication failed with `401 OAuth access token has been revoked`; no child changes or independent review were used.

The live forced VC6 probe was run before editing. It reached `_pickle.c` as the first blocker, not the older recorded `_blake2` frontier: `Unpickler_traverse()` at line 7266 declared `PyObject **memo = self->memo;` after executable `Py_VISIT()` statements, violating VC6/C89 declaration ordering. This run therefore advanced the actual live frontier and did not touch `_blake2`.

- `cpython/Modules/_pickle.c` — hoisted `PyObject **memo` to `Unpickler_traverse()`'s opening declaration group and changed the original declaration to `memo = self->memo;`. Assignment timing and traversal/refcount behavior are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion for `Unpickler_traverse()` declaration ordering.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`; it applies cleanly to pristine `v3.11.16`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; `total=16 compiled=15 cached=0 skipped=0`; first blocker `_pickle.c(7266)`, `error C2143`, mixed declaration `PyObject **memo = self->memo;`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before the source edit | exit 1 as required by TDD; the new `Unpickler_traverse` assertion failed while prior assertions passed. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after the source edit | exit 0, `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after the source edit | exit 2; `Unpickler_traverse()` cleared. New first blockers are `_pickle.c(7589)` C99 `for (size_t i = ...)` and `_pickle.c(7637)` C99 `for (size_t i = ...)` with `SIZE_MAX` undeclared; `total=16 compiled=15 cached=0`. |
| `bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh` | exit 0; all regression suites reported `ALL TESTS PASSED`. |
| `git -C cpython diff --check && bash -n scripts/vc6-probe-pythoncore-frontier.test.sh` | exit 0. |
| pristine detached `v3.11.16` worktree `git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; temporary verification worktree removed. |

**Current compile-frontier state:** `_pickle.c` now compiles past `Unpickler_traverse()` under VC6. The next narrow frontier is the distinct C99 `for`-initializer family in `Unpickler_set_memo()` at the two loop sites, with the `SIZE_MAX` diagnostic at the cleanup loop. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution is claimed.


## Latest revision (`_pickle.c` load_readonly_buffer C89 declaration-order slice)

Date: 2026-09-12

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`; the nested `cpython/` checkout remains detached with existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. The focused coding-agent delegation was attempted but could not start because the runtime lacks the `anthropic` package; no child changes or independent review were used.

The recorded `_pickle.c` frontier was re-probed before editing and remained true: `load_next_buffer()` compiles cleanly. The first stable blocker was `load_readonly_buffer()` at lines 5687–5688, where `PyObject *obj = ...` and `PyObject *view = ...` follow executable statements and violate VC6/C89 declaration ordering.

- `cpython/Modules/_pickle.c` — hoisted `PyObject *obj` and `PyObject *view` beside `Py_ssize_t len`; changed the three initializers to assignments at their original execution points. No control flow or refcount ordering changed.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion for `load_readonly_buffer()` declaration ordering.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`; it applies cleanly to pristine `v3.11.16`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; `total=16 compiled=15 cached=0 skipped=0`; first blocker `_pickle.c(5687)`, `error C2275` for `PyObject *obj`, followed by the same declaration-order error for `view`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before the source edit | exit 1 as required by TDD; the new `load_readonly_buffer` assertion failed. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after the source edit | exit 0, `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after the source edit | exit 2; `_pickle.c` cleared `load_readonly_buffer()`. New first stable blockers are `_pickle.c(7266)` C89 declaration-order fallout for `memo`, then C99 `for`-init/declaration fallout at lines 7587 and 7635 (`SIZE_MAX` also reported). Summary remains `total=16 compiled=15 cached=0 skipped=0`. |
| `bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh` | exit 0; every regression suite reported `ALL TESTS PASSED`. |
| `git -C cpython diff --check && bash -n scripts/vc6-probe-pythoncore-frontier.test.sh` | exit 0. |
| pristine detached `v3.11.16` worktree `git apply --check ../../compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; temporary worktree removed. |

**Current compile-frontier state:** `_pickle.c` now compiles past `load_readonly_buffer()` under VC6. The next narrow frontier is the later `_pickle.c` declaration-order/C99 syntax group beginning at line 7266. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution is claimed.

## Latest revision (`_pickle.c` load_next_buffer C89 declaration-order slice)

Date: 2026-09-12

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`; the nested `cpython/` checkout remains detached with existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. The required focused coding-agent delegation was attempted but could not start because the delegation runtime lacks the `anthropic` package; no child changes or independent review were used.

The recorded frontier was re-probed before editing and remained true through `_pickle_PicklerMemoProxy_copy_impl()`. The first stable blocker was `load_next_buffer()` at `_pickle.c(5662)`, a C99 mixed declaration after the `self->buffers == NULL` executable check.

- `cpython/Modules/_pickle.c` — hoisted `PickleState *st` and `PyObject *buf` into the function declaration group; preserved both `_Pickle_GetGlobalState()` assignment points and the iterator assignment order.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused TDD assertion for `load_next_buffer()` declaration ordering.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the complete nested `git -C cpython diff`; it applies cleanly to pristine `v3.11.16`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; `total=16 compiled=15 cached=0 skipped=0`; first blocker `_pickle.c(5662)`, `error C2275`, `PyObject *buf = PyIter_Next(...)`, with same-function declaration fallout. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before the source edit | exit 1 as required by TDD; the new `load_next_buffer` assertion failed. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after the source edit | exit 0, `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after the source edit | exit 2; `load_next_buffer()` cleared. New first blocker is `load_readonly_buffer()` at `_pickle.c(5687)`, C89 mixed declarations for `PyObject *obj` and `PyObject *view`; `total=16 compiled=15 cached=0 skipped=0`. |
| `bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh` | exit 0; every regression suite reported `ALL TESTS PASSED`. |
| `git -C cpython diff --check && bash -n scripts/vc6-probe-pythoncore-frontier.test.sh` | exit 0. |
| pristine detached `v3.11.16` worktree `git apply --check ../../compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0; temporary worktree removed. |
| regenerated patch included in top-level `git diff --check` | exit 2 due trailing-whitespace diagnostics in generated patch hunks; these are diff payload whitespace lines from existing CPython changes, not source-file diagnostics. |

**Current compile-frontier state:** `_pickle.c` now compiles past `load_next_buffer()` under VC6. The next narrow frontier is `load_readonly_buffer()`'s two C89 mixed declarations at lines 5687–5688. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, no Wine execution of Python, and no real Windows 98 SE execution is claimed.

Date: 2026-09-12

## Latest revision (`_pickle.c` PicklerMemoProxy.copy C89 for-init slice)

Baseline remains CPython `v3.11.16` at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549` in the pristine tag worktree. Existing uncommitted port edits were preserved; nothing was reset, cleaned, stashed, discarded, committed, pushed, or published.

The recorded frontier state was re-probed before editing and remained true: `getpath.c`, `_abc.c`, `_bisectmodule.c`, `_blake2` sources, and `_pickle.c` through `Pickler_traverse()` compiled cleanly. The first stable blocker was `_pickle.c(4895)`, the C99 `for (size_t i = ...)` initializer in `_pickle_PicklerMemoProxy_copy_impl()`.

- `cpython/Modules/_pickle.c` — added `size_t i;` to the function declaration group and changed only the loop initializer to `for (i = 0; ...)`; behavior and assignment timing are unchanged.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused regression assertion before the source edit, as required by TDD.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the nested `git -C cpython diff`; it applies cleanly to pristine `v3.11.16`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; `total=16 compiled=15 cached=0 skipped=0`; first blocker `_pickle.c(4895)`, `error C2143`, C99 `for (size_t i = ...)`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the focused assertion, before the source edit | exit 1 as required by TDD; the new `PicklerMemoProxy.copy` assertion failed. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after the source edit | exit 0, `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after the source edit | exit 2; `_pickle.c(4895)` is cleared and the first stable blocker advances to `load_next_buffer()` at line 5662: C89 mixed declaration `PyObject *buf = PyIter_Next(...)`; `total=16 compiled=15 cached=0 skipped=0`. |
| shell syntax plus public/core/PathCch/getpath/stdint/frontier regression suites | exit 0; every suite reported `ALL TESTS PASSED`. |
| `git -C cpython diff --check` and `bash -n scripts/vc6-probe-pythoncore-frontier.test.sh` | exit 0. |
| pristine detached `v3.11.16` worktree `git apply --check` for regenerated patch | exit 0; temporary worktree removed. |
| focused Claude Code delegation | not completed: `401 OAuth access token has been revoked`; no child changes were used and no independent review is claimed. |

**Current compile-frontier state:** `_pickle_PicklerMemoProxy_copy_impl()` now compiles past the C99 loop initializer under VC6. The next narrow frontier is `load_next_buffer()`'s C89 declaration-order defect at `_pickle.c(5662)`. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine execution of Python, or real Windows 98 SE execution is claimed.

## Latest revision (`_pickle.c` Pickler_traverse C89 declaration slice)

Baseline remains CPython `v3.11.16` (commit `41388c9` in the pristine tag worktree). All port edits remain uncommitted in the nested `cpython/` checkout; nothing was reset, cleaned, stashed, discarded, committed, pushed, or published.

The recorded `_pickle.c` frontier was re-probed before editing. `save_set()` remained clean; the first stable blocker was `Pickler_traverse()` at the later `PyMemoTable *memo = self->memo;` declaration after executable `Py_VISIT()` statements.

- `cpython/Modules/_pickle.c` — hoisted `PyMemoTable *memo;` before the `Py_VISIT()` statements and changed the original declaration to `memo = self->memo;`. No later `_pickle.c` defect family was changed.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added the focused regression assertion for `Pickler_traverse()` declaration order.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from the nested `git -C cpython diff`; it applies cleanly to pristine `v3.11.16`.
- `PORT_STATUS.md` — this report.

**Exact command results:**

| Command | Result |
|---|---|
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice | exit 2; `total=16 compiled=15 cached=0 skipped=0`; first blocker `_pickle.c(4725)`, `error C2143`, `PyMemoTable *memo = self->memo`. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the focused assertion, before the source edit | exit 1 as required by TDD; the new `Pickler_traverse` assertion failed. |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` after the source edit | exit 0, `ALL TESTS PASSED`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after the source edit | exit 2; `Pickler_traverse()` is clean and the first blocker advances to `_pickle.c(4895)`, the C99 `for (size_t i = ...)` declaration in the next `_pickle.c` function; `total=16 compiled=15 cached=0 skipped=0`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.test.sh` plus public, core, PathCch, getpath, stdint, and frontier regression suites | exit 0; every suite reported `ALL TESTS PASSED`. |
| `git -C cpython diff --check` | exit 0. |
| pristine detached `v3.11.16` worktree `git apply --check` for the regenerated patch | exit 0; temporary worktree removed. |

**Current compile-frontier state:** `_pickle.c` through `Pickler_traverse()` compiles cleanly under VC6. The next frontier is `_pickle.c(4895)`, a distinct C89 declaration-order defect in a later `for` initializer. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine execution of Python, or real Windows 98 SE execution is claimed.

**Delegation note:** the focused Claude Code lane was launched with the required no-commit/no-reset scope but exited without producing a usable report or changes; implementation and verification were performed directly, with no independent review claimed.


Baseline: CPython `v3.11.16`
Compiler: MSVC 6.0 (`cl.exe` 12.00.8804), from external `MSVC600`
Host test environment: Linux + Wine

## Files changed in this revision (`_blake2/blake2b_impl.c` ULL-literal + declaration-order + `long long`/designated-initializer slice)

All still uncommitted; nothing in this list has been pushed anywhere.

- `cpython/Modules/_blake2/impl/blake2b-ref.c` — two separate slices, each re-probed individually before moving to the next:
  - **ULL/LL literal-suffix root blocker.** Inventoried every C99 `ULL`/`LL`-suffixed integer literal in the file by grep (`grep -n "ULL\|[0-9]LL\b"`): the 8 `blake2b_IV[8]` initializer constants (lines 23-26) and 4 occurrences of `~0ULL`/`0ULL` in `blake2b_set_lastnode()`/`blake2b_clear_lastnode()`/`blake2b_set_lastblock()`/`blake2b_clear_lastblock()` (lines 48, 54, 63, 71) — 12 literals total, and no others (`blake2b_impl.c` itself has one more at line 163, but it sits inside a dead `#ifdef HAVE_BLAKE2S` branch that is never defined in this port, so the C preprocessor only needs to recognize it as a pp-number token to skip it, not evaluate its suffix, and it was left alone). VC6's C89 front end rejects the C99 `ULL`/`LL` suffix spelling outright (`error C2059: syntax error : 'bad suffix on number'`) but does accept the Microsoft-specific `i64`/`ui64` 64-bit literal suffixes. Rather than rewriting the literals to bare `ui64` (a new, unreviewed spelling choice), every literal was routed through the existing `PY_LL`/`PY_ULL` macro pair already defined in `PC/pyconfig.h` for exactly this compiler (`#define PY_ULL(x) x##ui64` when `_MSC_VER < 1300`, else `x##ULL`) — the same macro pair `Include/pyport.h` already anticipates via its own `#ifndef PY_LL` guard and accompanying comment ("see PC/pyconfig.h for the compilers that need something other than the C99 LL/ULL suffixes"), and the same defect family/fix shape as the earlier `PY_LONG_LONG` routing for `_abc.c`. `blake2b-ref.c` is `#include`d from `blake2b_impl.c` *after* `#include "Python.h"`, so `PY_ULL` is already visible by the time it is preprocessed; no new include was added. Every literal's digit value is unchanged — `0x6a09e667f3bcc908ULL` became `PY_ULL(0x6a09e667f3bcc908)`, `~0ULL` became `~PY_ULL(0)`, etc. — this is a suffix-spelling change only, and it round-trips to the identical `x##ULL` expansion on every non-VC6 compiler, so no behavior change on any other target.
  - **C89 declaration-order fallout in the same file**, the next diagnostic once the literal-suffix errors cleared: `blake2b_init0()` declared its `for` loop counter as a C99 `for( int i = 0; ...)` init-declaration, and `blake2b_init_param()` declared `uint8_t *p` after the `blake2b_init0( S )` statement and used a second C99 `for( size_t i = 0; ...)` init-declaration. Both were hoisted to each function's opening declaration group (`int i;` / `uint8_t *p; size_t i;`), with every assignment left at its original execution point (`p = (uint8_t *)(P);` still runs right after `blake2b_init0(S)`, in the same order) — the same hoist-and-reprobe pattern already used throughout this port (`_abc.c`, `getpath.c`, `pystate.c`). No control flow or arithmetic changed.
- `cpython/Modules/_blake2/blake2b_impl.c` — two more of the previously-characterized-but-unfixed defect families, each re-probed individually:
  - Changed `unsigned long long node_offset` (the `py_blake2b_new_impl()` parameter, line 94) to `unsigned PY_LONG_LONG node_offset`. VC6 has no `long long` keyword (`error C2632: 'long' followed by 'long' is illegal`); this is not a new port-local convention — CPython's own public headers already spell 64-bit unsigned parameters exactly this way for the same reason (e.g. `Include/longobject.h`'s `PyLong_FromUnsignedLongLong(unsigned PY_LONG_LONG)` and `PyLong_AsUnsignedLongLong`). `_PyLong_UnsignedLongLong_Converter()` (the Argument Clinic-generated converter call site for this parameter) takes a `void *` out-parameter, so the declared-type change has no call-site ABI/type-mismatch implications.
  - `py_blake2b_dealloc()`: hoisted `PyTypeObject *type` into the function's opening declaration group (previously declared, C89-illegally, after the lock-free and secure-zero statements); the assignment `type = Py_TYPE(self);` stays at its original point, immediately before `PyObject_Free(self)`/`Py_DECREF(type)`, unchanged.
  - `blake2b_type_spec`: converted from C99 designated initializers (`.name = ...`, `.basicsize = ...`, `.flags = ...`, `.slots = ...`) to plain positional initializers in `PyType_Spec`'s declared field order from `Include/object.h` (`name`, `basicsize`, `itemsize`, `flags`, `slots`); the struct's initializer omitted `itemsize`, so the positional form spells that slot `0` explicitly, matching the implicit C99 zero-fill it already had. Same defect family and fix approach as `_abc_data_type_spec`/`_abcmodule`/`_bisectmodule`'s `PyModuleDef` literals earlier in this port. Field values and order are unchanged.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from `git -C cpython diff` (4800 lines) so the project-local compatibility patch includes this `_blake2/blake2b_impl.c` slice plus all prior uncommitted compatibility edits. Reproducibility check: `git apply --check` against a pristine temporary `v3.11.16` worktree exited 0; the temporary worktree was removed afterward.
- `PORT_STATUS.md` — this revision.

**Command results (all reproduced in this revision):**

| Command | Result |
|---|---|
| `bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh` | exit 0 (each script individually) — public probe suite, core probe suite, PathCch shim suite, getpath frozen-header generator suite, stdint shim suite, and pythoncore frontier regression suite all passed with no regressions after this slice. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` (before this revision's first edit) | exit 2 — confirmed the recorded first blocker reproduces exactly: bare `ULL` literal-suffix errors in `impl/blake2b-ref.c` (`error C2059: syntax error : 'bad suffix on number'`) as the first diagnostic for `Modules/_blake2/blake2b_impl.c`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` (after the `PY_ULL`/`PY_LL` literal-suffix slice only) | exit 2 — every `ULL`-suffix diagnostic is gone. New first blocker: `cpython\Modules\_blake2\impl/blake2b-ref.c(143) : error C2143: syntax error : missing ';' before 'type'` (the `for( int i = ...)` C99 init-declaration in `blake2b_init0()`), with follow-on errors at lines 165/168-169 in `blake2b_init_param()`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` (after the `blake2b-ref.c` declaration-order slice) | exit 2 — `impl/blake2b-ref.c` is now fully clean (no diagnostics reference it anymore). New first blockers, all in `Modules/_blake2/blake2b_impl.c`/its clinic header: `error C2632: 'long' followed by 'long' is illegal` at `clinic/blake2b_impl.c.h(18)`, `clinic/blake2b_impl.c.h(39)`, and `blake2b_impl.c(94)`; `error C2275: 'PyTypeObject' : illegal use of this type as an expression` at `blake2b_impl.c(397)`; and `error C2059: syntax error : '.'` at `blake2b_impl.c(412)`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` (after the `unsigned PY_LONG_LONG` slice only) | exit 2 — all three `long long` diagnostics are gone; the `PyTypeObject`/designated-initializer diagnostics at lines 397/412 remain, confirming they are independent defects rather than parser-desync fallout. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` (after the `py_blake2b_dealloc()`/`blake2b_type_spec` slice — final state this revision) | exit 2 — `Modules/_blake2/blake2b_impl.c` now compiles with **zero** errors and **zero** warnings; `total=6 compiled=5 cached=0 skipped=0`. The frontier advances to the next source in `pythoncore.vcxproj` order, `Modules/_blake2/blake2s_impl.c` (autogenerated from `blake2b_impl.c` per its own header comment), whose first blockers are the identical defect families mirrored into the `s`-variant files: C99 `for`-init-declarations in `impl/blake2s-ref.c` (lines 231, 275), `unsigned long long` in `clinic/blake2s_impl.c.h`(18,39)/`blake2s_impl.c`(94), a bare `ULL`-suffix literal at `blake2s_impl.c(163)` (`if (node_offset > 0xFFFFFFFFFFFFULL)`, guarded by `#ifdef HAVE_BLAKE2S` in `blake2b_impl.c` but **not** guarded in `blake2s_impl.c`, so it is live code there), and the same `PyTypeObject *type = Py_TYPE(self);`/designated-initializer pair at `blake2s_impl.c`(397)/(412). None of this has been fixed yet. |
| `bash scripts/vc6-probe-core.sh cpython/Modules/main.c` | exit 0 — still compiles cleanly after this slice. |
| `bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c` | exit 0 — still compiles cleanly after this slice. |
| `git -C cpython worktree add --detach ../build/verify-vc6-patch-worktree v3.11.16 && git -C build/verify-vc6-patch-worktree apply --check ../../compat/msvc600/cpython-3.11.16-vc6-headers.patch && git -C cpython worktree remove ../build/verify-vc6-patch-worktree --force` | exit 0 — regenerated compatibility patch applies cleanly to a pristine detached `v3.11.16` worktree; temporary worktree removed. |

**Current pythoncore compile-frontier status:** `Modules/_blake2/blake2b_impl.c` (and its `#include`d `impl/blake2b-ref.c`) is fully clean under the VC6 frontier probe (0 errors, 0 warnings), advancing the frontier past `_abc.c`, `_bisectmodule.c`, `blake2module.c`, and now `blake2b_impl.c`. The frontier has moved on to `Modules/_blake2/blake2s_impl.c`, whose first blocker set is the same defect families just fixed here, mirrored into the autogenerated `s`-variant sources — plus one new wrinkle: the `0xFFFFFFFFFFFFULL` node-offset overflow check that sits inside a dead `#ifdef HAVE_BLAKE2S` branch in `blake2b_impl.c` (and so never needed fixing there) is **not** dead code in `blake2s_impl.c`, so its `ULL` suffix will need the same `PY_ULL()` treatment as a live diagnostic this time. Recommended next slice: mirror this revision's three sub-slices onto the `s`-variant files in the same order (literal suffixes in `impl/blake2s-ref.c` plus the live `blake2s_impl.c(163)` literal first, then `blake2s-ref.c`'s C89 declaration-order fallout, then `unsigned PY_LONG_LONG`/`PyTypeObject`/designated-initializer in `blake2s_impl.c`/its clinic header), re-probing after each sub-slice as done here.

**Caveat:** this is still compile-probe work only. No full `pythoncore.dll`/`python.exe` build, no successful link, no Wine launch, and no Windows 98 runtime execution is claimed.

## Files changed in previous revision (`compat/msvc600/stdint.h` shim + `_blake2/blake2module.c` slice)

All still uncommitted; nothing in this list has been pushed anywhere.

- `compat/msvc600/stdint.h` — new VC6-scoped project-local compatibility header providing the missing C99 `<stdint.h>` that `cpython/Modules/_blake2/impl/blake2.h` and `blake2-impl.h` `#include`. **Evidence before adding it:** grepped every fixed-width-integer identifier (`u?int(8|16|32|64)_t`, `u?intptr_t`, `u?int_least*_t`, `u?int_fast*_t`, `size_t`) across the entire `Modules/_blake2/` tree (both impl headers/sources and the `blake2b_impl.c`/`blake2s_impl.c`/clinic wrappers). The only fixed-width types actually used anywhere in that tree are `uint8_t`, `uint32_t`, and `uint64_t` (in `load32/64/48`, `store32/64/48`, `rotl32/64`, `rotr32/64`, and the reference block-compression loops); no `int8_t`/`int16_t`/`int32_t`/`int64_t` or `intptr_t`/`uintptr_t` appear at all. `size_t` is also used but is unaffected — it already comes from `<stddef.h>`, which VC6 has natively. **Design:** rather than re-declaring these three typedefs a second time under a second include guard, `stdint.h` forwards to the already-existing, already-verified `compat/msvc600/inttypes.h` (added in an earlier revision so CPython's own `Include/pyport.h`, which does `#include <inttypes.h>`, would compile) via `#include "inttypes.h"`. `inttypes.h`'s own include guard makes this forwarding idempotent regardless of which of the two headers a given translation unit reaches first, so a TU that ends up pulling in both `Python.h` (→ `pyport.h` → `<inttypes.h>`) and `blake2.h` (→ `<stdint.h>`) cannot hit a duplicate-typedef error. Width assumptions (unchanged, already relied on by `inttypes.h`): `uint8_t` = `unsigned char` (1 byte), `uint32_t` = `unsigned long` (4 bytes on Win32/ILP32), `uint64_t` = `unsigned __int64` (VC6's non-standard 64-bit extension, 8 bytes) — verified sufficient by a compile-time fixture (below) using `typedef char check[(sizeof(uint32_t)==4) ? 1 : -1];`-style width assertions, since VC6 has no `static_assert`.
- `scripts/fixtures/vc6_stdint_smoke.c` — new focused compile fixture: includes both `<stdint.h>` and `<inttypes.h>` in the same translation unit (reproducing the Python.h + blake2.h coexistence case), asserts `sizeof(uint8_t)==1`/`sizeof(uint32_t)==4`/`sizeof(uint64_t)==8` at compile time, and exercises `load32`/`load64`/`rotl32`/`rotl64` in the same shape `blake2-impl.h` uses.
- `scripts/vc6-probe-stdint.test.sh` — new regression test for the shim and fixture under the VC6 probe, modeled directly on the existing `scripts/vc6-probe-pathcch.test.sh` (skips, not fails, when Wine/MSVC600 are unavailable).
- `cpython/Modules/_blake2/blake2module.c` — with the `<stdint.h>` blocker gone, the file advanced to two blockers from defect families already fixed elsewhere in this port: (1) `blake2_exec()` declared `PyObject *d = st->blake2b_type->tp_dict;` after preceding statements (C89 mixed-declaration; VC6 requires declarations before statements) — hoisted `PyObject *d;` into the function's opening declaration group and changed the first assignment to plain `d = ...`, leaving the second assignment (`d = st->blake2s_type->tp_dict;`) unchanged since `d` was already in scope there; (2) the `blake2_module` `PyModuleDef` struct literal mixed a positional `PyModuleDef_HEAD_INIT`/`"_blake2"` prefix with C99 designated initializers (`.m_doc = ...` etc.) for the rest — converted to plain positional initializers in `Include/moduleobject.h`'s declared field order (`m_base`, `m_name`, `m_doc`, `m_size`, `m_methods`, `m_slots`, `m_traverse`, `m_clear`, `m_free`), the same defect family and fix already used in `_abc.c` and `_bisectmodule.c`. Field values and order are unchanged — this is a spelling change only, not a behavior change.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from `git -C cpython diff` (4651 lines) so the project-local compatibility patch includes this `stdint.h`/`blake2module.c` slice plus all prior uncommitted compatibility edits. Reproducibility check: `git apply --check` against a pristine temporary `v3.11.16` worktree exited 0; the temporary worktree was removed afterward.
- `PORT_STATUS.md` — this revision.

**Command results (all reproduced in this revision):**

| Command | Result |
|---|---|
| `bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh` | exit 0 (each script individually) — public probe suite, core probe suite, PathCch shim suite, getpath frozen-header generator suite, new stdint shim suite, and pythoncore frontier regression suite all passed with no regressions after this slice. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` (before this slice) | exit 2 — confirmed the recorded first blocker reproduces exactly: `cpython\Modules\_blake2\impl/blake2.h(18) : fatal error C1083: Cannot open include file: 'stdint.h': No such file or directory`. Summary: `total=4 compiled=3 cached=0 skipped=0`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` (after adding `compat/msvc600/stdint.h` only, before the `blake2module.c` source edits) | exit 2 — the missing-`stdint.h` fatal error is gone; new first blocker is `cpython\Modules\_blake2\blake2module.c(98) : error C2275: 'PyObject' : illegal use of this type as an expression` (C89 mixed-declaration) immediately followed by the `.m_doc = ...` designated-initializer `error C2059: syntax error : '.'` at line 145. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` (after the `blake2module.c` slice) | exit 2 — `Modules/_blake2/blake2module.c` now compiles with **zero** errors and **zero** warnings. The frontier advances to the next source in `pythoncore.vcxproj` order, `Modules/_blake2/blake2b_impl.c`, whose new first blockers are a different defect family: bare `0ULL`/`64ULL`-style integer-literal suffixes in `Modules/_blake2/impl/blake2b-ref.c` (`error C2059: syntax error : 'bad suffix on number'` — VC6's C89 front end does not accept the C99 `ULL`/`LL` integer-constant suffixes at all, only `UL`/`L`/`U`), C99 mixed-declaration/`for`-init-declaration fallout in the same file, `unsigned long long` in `clinic/blake2b_impl.c.h` and `blake2b_impl.c` itself (the same `long long`-keyword gap already routed through `PY_LONG_LONG` elsewhere in this port), and a `PyTypeObject *type = ...` C89 mixed-declaration plus a `.` designated-initializer in `blake2b_impl.c`. None of this has been fixed yet. Summary: `total=5 compiled=4 cached=0 skipped=0`. |
| `bash scripts/vc6-probe-core.sh cpython/Modules/main.c` | exit 0 — still compiles cleanly after this slice. |
| `bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c` | exit 0 — still compiles cleanly after this slice. |
| `git -C cpython worktree add --detach ../build/verify-vc6-patch-worktree v3.11.16 && git -C build/verify-vc6-patch-worktree apply --check ../../compat/msvc600/cpython-3.11.16-vc6-headers.patch && git -C cpython worktree remove ../build/verify-vc6-patch-worktree --force` | exit 0 — regenerated compatibility patch applies cleanly to a pristine detached `v3.11.16` worktree; temporary worktree removed. |

**Current pythoncore compile-frontier status:** `Modules/_blake2/blake2module.c` is fully clean under the VC6 frontier probe (0 errors, 0 warnings), advancing the frontier past `_abc.c`, `_bisectmodule.c`, and now `blake2module.c`. The frontier has moved on to `Modules/_blake2/blake2b_impl.c` (via its `#include`d `impl/blake2b-ref.c`), whose first blocker is a new defect family for this port: VC6's C89 front end rejects the C99 `ULL`/`LL` unsigned-long-long integer-literal suffixes used throughout the BLAKE2 reference constants and IV tables. This is distinct from the already-solved `long long` *keyword* gap (`PY_LONG_LONG`) — it is about literal-suffix spelling, and will need either rewriting the affected literals (e.g. `0x6A09E667F3BCC908ULL` → a `PY_LONG_LONG`-safe spelling, likely via a cast or an `_LL`/`ui64`-suffix substitution valid under VC6) or a targeted macro, plus the follow-on C89 declaration-order, `long long`-keyword, and designated-initializer fixes already characterized above in `blake2b_impl.c` and its clinic header. Recommended next slice: `Modules/_blake2/impl/blake2b-ref.c`'s integer-literal suffixes first (it is the root blocker `blake2b_impl.c` `#include`s), then re-probe before touching `blake2b_impl.c` itself.

**Caveat:** this is still compile-probe work only. No full `pythoncore.dll`/`python.exe` build, no successful link, no Wine launch, and no Windows 98 runtime execution is claimed.

## Files changed in previous revision (`_bisectmodule.c` designated-initializer slice)

All still uncommitted; nothing in this list has been pushed anywhere.

- `cpython/Modules/_bisectmodule.c` — converted the `_bisectmodule` `PyModuleDef` struct literal from C99 designated initializers (`.m_name = ...`, `.m_size = ...`, etc.) to plain positional initializers in the struct's declared field order (`m_base`, `m_name`, `m_doc`, `m_size`, `m_methods`, `m_slots`, `m_traverse`, `m_clear`, `m_free`, per `Include/moduleobject.h`). This is the same defect family and same fix approach already used twice in `_abc.c` (`error C2059: syntax error : '.'`; VC6 has no C99 designated-initializer support). The struct had no `m_traverse` initializer in the original, so the corresponding positional slot is `NULL`. Field values and order are otherwise unchanged — this is a spelling change only, not a behavior change. No declaration-order (C89 mixed-declaration) errors followed this fix; the file compiles clean end-to-end on the first re-probe.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from `git -C cpython diff` (4609 lines) so the project-local compatibility patch includes this `_bisectmodule.c` slice plus all prior uncommitted compatibility edits. Reproducibility check: `git apply --check` against a pristine temporary `v3.11.16` worktree exited 0; the temporary worktree was removed afterward.
- `PORT_STATUS.md` — this revision.

**Command results (all reproduced in this revision):**

| Command | Result |
|---|---|
| `bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh` | exit 0 (each script individually) — public probe suite, core probe suite, PathCch shim suite, getpath frozen-header generator suite, and pythoncore frontier regression suite all passed with no regressions after this slice. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` (before this slice) | exit 2 — confirmed the recorded first blocker reproduces exactly: `cpython\Modules\_bisectmodule.c(329) : error C2059: syntax error : '.'` at `.m_name = "_bisect",` in the `_bisectmodule` `PyModuleDef` initializer. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` (after this slice) | exit 2 — `Modules/_bisectmodule.c` now compiles with **zero** errors and **zero** warnings (only the source-filename echo from `cl.exe`, same as a clean compile). The frontier advances to the next source in `pythoncore.vcxproj` order, `Modules/_blake2/blake2module.c`, whose new first blocker is `cpython\Modules\_blake2\impl/blake2.h(18) : fatal error C1083: Cannot open include file: 'stdint.h': No such file or directory` — a missing modern-C/SDK standard header, a different defect family from designated initializers or C89 declaration ordering, and not yet addressed here. Summary: `total=4 compiled=3 cached=0 skipped=0`. |
| `bash scripts/vc6-probe-core.sh cpython/Modules/main.c` | exit 0 — still compiles cleanly after this slice. |
| `bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c` | exit 0 — still compiles cleanly after this slice. |
| `git -C cpython worktree add --detach ../build/verify-vc6-patch-worktree v3.11.16 && git -C build/verify-vc6-patch-worktree apply --check ../../compat/msvc600/cpython-3.11.16-vc6-headers.patch && git -C cpython worktree remove ../build/verify-vc6-patch-worktree --force` | exit 0 — regenerated compatibility patch applies cleanly to a pristine detached `v3.11.16` worktree; temporary worktree removed. |

**Current pythoncore compile-frontier status:** `Modules/_bisectmodule.c` is fully clean under the VC6 frontier probe (0 errors, 0 warnings), advancing the frontier past both `_abc.c` and `_bisectmodule.c`. The frontier has moved on to `Modules/_blake2/blake2module.c`, whose first blocker is a missing `<stdint.h>` (needed by `Modules/_blake2/impl/blake2.h` for fixed-width integer types like `uint32_t`/`uint64_t`). This is a new defect family — a missing standard/SDK header, not a source-level C89/C99 compatibility issue — and will likely need either a project-local `stdint.h` compatibility shim (similar in spirit to the existing `compat/msvc600/pathcch.h` shim) or a decision to exclude/stub the `_blake2` module for this port, rather than a source-hoist slice. The recommended next step is to characterize the actual `uint32_t`/`uint64_t`/etc. usage in `Modules/_blake2/impl/*.h` before choosing between those two approaches.

**Caveat:** this is still compile-probe work only. No full `pythoncore.dll`/`python.exe` build, no successful link, no Wine launch, and no Windows 98 runtime execution is claimed.

## Files changed in previous revision (`_abc.c` C89 declaration-hoist + designated-initializer slice)

All still uncommitted; nothing in this list has been pushed anywhere.

- `cpython/Modules/_abc.c` — advanced the `_abc.c` frontier past its full body with a sequence of small, individually re-probed slices:
  - `abc_data_dealloc()`: hoisted `PyTypeObject *tp` before the `PyObject_GC_UnTrack(self)` statement (the exact line-67 blocker recorded at the start of this revision).
  - `_abc_data_type_spec` and the `_abcmodule` `PyModuleDef`: converted from C99 designated initializers (`.name = ...`, `.m_name = ...`, etc.) to plain positional initializers in declared field order. VC6 has no C99 designated-initializer support at all (`error C2059: syntax error : '.'`); this is a different defect family from declaration-hoisting, so it is called out separately here. Field values and order are unchanged — this is a spelling change only, not a behavior change.
  - `_in_weak_set()`, `_add_to_weak_set()`, `_abc__get_dump()`, `compute_abstract_methods()` (both `for` loops, including replacing their C99 `for (Py_ssize_t pos = 0; ...)` init-declarations with a function-scoped `pos` and hoisting per-iteration locals to the top of each loop body), `set_collection_flag_recursive()`, `_abc__abc_register_impl()`, `_abc__abc_instancecheck_impl()`, `_abc__abc_subclasscheck_impl()` (including its inner `for` loop over `subclasses`), and `subclasscheck_check_registry()` (including its inner `for` loop over the registry snapshot): hoisted all locals into each function's or block's opening declaration group, preserving every assignment at its original execution point (after argument validation, inside the same `if`/`for`/`while` branch, etc.). No control flow, lock/refcount ordering, or error-path behavior was changed anywhere in this slice.
  - The previously reported "generated `clinic/_abc.c.h` struct-redefinition conflict around line 583" was characterized while fixing `_abc__abc_instancecheck_impl()` (whose opening declaration group sat at old line 583): it was parser-desync fallout from the preceding unfixed declaration-hoist errors, not a real redefinition. `clinic/_abc.c.h` itself is unmodified and is only 163 lines long; there is no struct redefinition in it. This matches the caveat already recorded about that hypothesis.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from `git -C cpython diff` (4583 lines) so the project-local compatibility patch includes this `_abc.c` slice plus all prior uncommitted compatibility edits. Reproducibility check: `git apply --check` against a pristine temporary `v3.11.16` worktree exited 0; the temporary worktree was removed afterward.
- `PORT_STATUS.md` — this revision.

**Command results (all reproduced in this revision):**

| Command | Result |
|---|---|
| `bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh` | exit 0 (each script individually) — public probe suite, core probe suite, PathCch shim suite, getpath frozen-header generator suite, and pythoncore frontier regression suite all passed with no regressions after this slice. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` (before this slice) | exit 2 — confirmed the recorded first blocker reproduces exactly: `cpython\Modules\_abc.c(67) : error C2275: 'PyTypeObject' : illegal use of this type as an expression` at `PyTypeObject *tp = Py_TYPE(self);` in `abc_data_dealloc()`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` (after each incremental slice, ~10 live re-probes) | exit 2 each time until the final one — the first diagnostic advanced monotonically through `_abc.c`: line 67 (`abc_data_dealloc`) → line 109 designated-initializer `error C2059` (`_abc_data_type_spec`) → line 138 (`_in_weak_set`) → line 203 (`_add_to_weak_set`) → line 291 (`_abc__get_dump`) → line 311 (`compute_abstract_methods`) → line 507/512 (`set_collection_flag_recursive`) → line 537 (`_abc__abc_register_impl`) → line 612 (`_abc__abc_instancecheck_impl`) → line 695 (`_abc__abc_subclasscheck_impl`) → line 849 (`subclasscheck_check_registry`). Each slice was verified against the live VC6 frontier before moving to the next. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` (after the final `_abc.c` slice) | exit 2 — `Modules/_abc.c` now compiles with **zero** errors and **zero** warnings; `total=3 compiled=2 cached=0 skipped=0`. The frontier advances to the next source in `pythoncore.vcxproj` order, `Modules/_bisectmodule.c`, whose new first blocker is `cpython\Modules\_bisectmodule.c(329) : error C2059: syntax error : '.'` — the same C99 designated-initializer defect family just fixed twice in `_abc.c`, not yet fixed here. |
| `bash scripts/vc6-probe-core.sh cpython/Modules/main.c` | exit 0 — still compiles cleanly after this slice. |
| `bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c` | exit 0 — still compiles cleanly after this slice. |
| `git -C cpython worktree add --detach ../build/verify-vc6-patch-worktree v3.11.16 && git -C build/verify-vc6-patch-worktree apply --check ../../compat/msvc600/cpython-3.11.16-vc6-headers.patch && git -C cpython worktree remove ../build/verify-vc6-patch-worktree --force` | exit 0 — regenerated compatibility patch applies cleanly to a pristine detached `v3.11.16` worktree; temporary worktree removed. |

**Current pythoncore compile-frontier status:** `Modules/_abc.c` is fully clean under the VC6 frontier probe (0 errors, 0 warnings). The frontier has moved on to `Modules/_bisectmodule.c`, whose first blocker is a C99 designated-initializer struct literal (`error C2059: syntax error : '.'` at line 329), the same defect family already fixed twice above (`_abc_data_type_spec`, `_abcmodule`). The recommended next slice is `_bisectmodule.c`'s designated initializer(s), followed by whatever C89 declaration-order issues follow in that file, using the same per-function hoist-and-reprobe approach used throughout this revision.

**Caveat:** this is still compile-probe work only. No full `pythoncore.dll`/`python.exe` build, no successful link, no Wine launch, and no Windows 98 runtime execution is claimed.

## Files changed in previous revision (`_abc.c` frontier: `pycore_moduleobject.h` declaration-hoist + `long long` spelling)

All still uncommitted; nothing in this list has been pushed anywhere.

- `cpython/Include/internal/pycore_moduleobject.h` — hoisted `_PyModule_GetDict()`'s `PyObject *dict` declaration into the function's opening declaration group (C89/VC6 requires declarations before statements; the prior form declared `dict` after the `assert(PyModule_Check(mod));` statement). The assignment stays at the original point, and the following `assert(dict != NULL);`/return are unchanged.
- `cpython/Modules/_abc.c` — changed the two `unsigned long long` struct field declarations (`_abcmodule_state.abc_invalidation_counter`, `_abc_data._abc_negative_cache_version`) to `unsigned PY_LONG_LONG`. VC6 has no `long long` keyword at all (`error C2632: 'long' followed by 'long' is illegal`); CPython's own `PC/pyconfig.h` already defines `PY_LONG_LONG` to fall back to `__int64` for `_MSC_VER < 1300` (VC6) for exactly this reason. This routes through that existing, already-correct CPython compatibility macro instead of adding a new shim; no other files in the current frontier use the bare `long long` spelling.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from `git -C cpython diff` so the project-local compatibility patch includes this slice plus all prior uncommitted compatibility edits. Reproducibility check: `git apply --check` against a pristine temporary `v3.11.16` worktree exited 0.
- `PORT_STATUS.md` — this revision.

**Command results (all reproduced in this revision):**

| Command | Result |
|---|---|
| `bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh` | exit 0 (each script individually) — public probe suite, core probe suite, PathCch shim suite, getpath frozen-header generator suite, and pythoncore frontier regression suite all passed with no regressions after this slice. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` (before this slice) | exit 2 — first blocker `cpython\Include\internal\pycore_moduleobject.h(33) : error C2143: syntax error : missing ';' before 'type'` at `PyObject *dict = ((PyModuleObject *)mod) -> md_dict;`, cascading into spurious `dict`-undeclared fallout plus `pycore_gc.h(15) : error C2061: syntax error : identifier 'uintptr_t'` and further undefined-struct fallout through `pycore_interp.h`, `pycore_global_objects.h`, `pycore_runtime.h`, and `pycore_object.h`, then `_abc.c` fallout until `fatal error C1003: error count exceeds 100`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` (after `pycore_moduleobject.h` hoist only) | exit 2 — confirms the hoist was the true root cause: every `pycore_gc.h`/`pycore_interp.h`/`pycore_global_objects.h`/`pycore_runtime.h`/`pycore_object.h` diagnostic is gone (those headers were never actually broken; VC6's error recovery from the single C89 syntax error had desynced parsing for the rest of the translation unit). New first blocker is `cpython\Modules\_abc.c(22) : error C2632: 'long' followed by 'long' is illegal` at `unsigned long long abc_invalidation_counter;`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` (after both fixes) | exit 2 — `_abc.c`'s `long long` blocker is gone. New first blocker is `cpython\Modules\_abc.c(67) : error C2275: 'PyTypeObject' : illegal use of this type as an expression` (a C89 mixed-declaration pattern, same family as already fixed repeatedly in `pystate.c`/`pylifecycle.c`/`getpath.c`), followed by many more declaration-order and declaration-after-statement errors throughout the rest of `_abc.c`'s ~35 functions until `fatal error C1003: error count exceeds 100` at line 784. Summary: `total=2 compiled=1 cached=0 skipped=0`. |
| `bash scripts/vc6-probe-core.sh cpython/Modules/main.c` | exit 0 — still compiles cleanly after this slice. |
| `bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c` | exit 0 — still compiles cleanly after this slice. |
| `git -C cpython worktree add --detach ../build/verify-vc6-patch-worktree v3.11.16 && git -C build/verify-vc6-patch-worktree apply --check ../../compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0 — regenerated compatibility patch applies cleanly to a pristine detached `v3.11.16` worktree. |

**Current pythoncore compile-frontier status:** the frontier has advanced past the `pycore_moduleobject.h`/GC-header cascade and past `_abc.c`'s `long long` blocker. `Modules/_abc.c` is now the active frontier file; the next blocker is a large set of C89 declaration-order violations spread across most of its functions (starting at line 67), plus at least one apparent struct-redefinition conflict with the Argument Clinic-generated `clinic/_abc.c.h` at line 583 that has not yet been individually characterized. This will need a multi-slice declaration-hoist pass through `_abc.c`, similar in shape to the `pystate.c` slices recorded below, rather than a single edit.

**Caveat:** this is still compile-probe work only. No full `pythoncore.dll`/`python.exe` build, no successful link, no Wine launch, and no Windows 98 runtime execution is claimed.

## Files changed in previous revision (VC6 frontier `/D` string define transport)

All still uncommitted; nothing in this list has been pushed anywhere.

- `scripts/vc6-probe-pythoncore-frontier.sh` — moved live VC6 compile arguments into per-object response files so quoted `/D` string literals no longer traverse `wine cmd /c` as inline command text. `quote_define_for_cmd()` now doubles define-owned backslashes before protecting literal quotes, so `VPATH="..\\.."` reaches CL preprocessing as the C string literal `"..\\.."`; empty-string defines such as `PYDEBUGEXT=""` are preserved. Added `render_compile_command_for_test()` as a safe no-Wine regression helper for define rendering.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — added a list-only/no-toolchain assertion that checks rendered per-file string defines for `VPATH`, `PYDEBUGEXT`, and `PLATLIBDIR` before the optional live Wine/VC6 run.
- `PORT_STATUS.md` — this revision.

**Command results (all reproduced in this revision):**

| Command | Result |
|---|---|
| `bash -n scripts/vc6-probe.test.sh scripts/vc6-probe-core.test.sh scripts/vc6-probe-pathcch.test.sh scripts/generate-getpath-frozen.test.sh scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh scripts/generate-getpath-frozen.sh scripts/vc6-probe-minlink.sh scripts/vc6-probe-core.sh scripts/vc6-probe.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh` | exit 0 — shell syntax plus public probe suite, core probe suite, PathCch shim suite, getpath frozen-header generator suite, and pythoncore frontier regression suite all passed. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | exit 2 — `Modules/getpath.c` now compiles cleanly under the forced frontier. The frontier advances to `Modules/_abc.c`; first exact blocker is `cpython\\Include\\internal\\pycore_moduleobject.h(33) : error C2143: syntax error : missing ';' before 'type'`, followed by `dict` undeclared fallout, missing/undefined GC internals beginning with `pycore_gc.h(15) : error C2061: syntax error : identifier 'uintptr_t'`, and then `_abc.c` VC6/C89/modern-C fallout until `fatal error C1003: error count exceeds 100`. Summary: `total=2 compiled=1 cached=0 skipped=0`. |

**Current pythoncore compile-frontier status:** the quoted macro transport blocker is resolved in the harness, and the frontier has advanced past `Modules/getpath.c`. The next actionable blocker is now in shared internal headers reached while compiling `Modules/_abc.c`, starting with C89 declaration ordering in `pycore_moduleobject.h` and missing/unsupported GC typedef structure (`uintptr_t` / `PyGC_Head`) fallout.

**Caveat:** this is still compile-probe work only. No full `pythoncore.dll`/`python.exe` build, no successful link, no Wine launch, and no Windows 98 runtime execution is claimed.

## Files changed in previous revision (`getpath.c` _PyConfig_InitPathConfig C89 declaration-hoist slice)

All still uncommitted; nothing in this list has been pushed anywhere.

- `cpython/Modules/getpath.c` — advanced `_PyConfig_InitPathConfig()` past the first main-body VC6/C89 declaration-order blocker by hoisting active locals (`configDict`, `dict`, `co`, Windows-only `winreg`, and `r`) into the function opening declaration group. Assignments remain at their original execution points after `_PyPathConfig_ReadGlobal()`, early status/`compute_path_config` return, and GIL check; refcount cleanup, `winreg` fallback handling, code evaluation, `_PyConfig_FromDict()`, and return statuses are unchanged. Disabled `#if 0` debug locals were left untouched.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from `git -C cpython diff` so the compatibility patch includes this `_PyConfig_InitPathConfig()` declaration-hoist slice plus prior uncommitted compatibility edits.
- `PORT_STATUS.md` — this revision.

**Command results (all reproduced in this revision):**

| Command | Result |
|---|---|
| `bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh` | exit 0 — public probe suite, core probe suite, PathCch shim suite, getpath frozen-header generator suite, and pythoncore frontier regression suite all passed. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | exit 2 — `_PyConfig_InitPathConfig()` now gets past the prior line-887 `PyObject *configDict = _PyConfig_AsDict(config);` blocker, plus the follow-on `dict`, `co`, Windows `winreg`, and `r` declaration-order blockers. New exact first blocker is `build\generated\cpython\Modules\getpath.c(956) : error C2001: newline in constant` at `!decode_to_dict(dict, "VPATH", VPATH)`, followed by adjacent newline-in-constant diagnostics for `PLATLIBDIR`, `PYDEBUGEXT`, and `PYWINVER`, then parse fallout. Summary: `total=1 compiled=0 cached=0 skipped=0`. |
| `git -C cpython worktree add --detach ../build/verify-vc6-patch-worktree v3.11.16 && git -C build/verify-vc6-patch-worktree apply --check ../../compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0 — regenerated compatibility patch applies cleanly to a pristine detached `v3.11.16` worktree. |

**Current pythoncore compile-frontier status:** the requested `_PyConfig_InitPathConfig()` declaration-order slice is complete and verified. The frontier still starts at `Modules/getpath.c`, but the next blocker has advanced from C89 declarations to quoted macro/value handling in the initial-value dictionary expression.

**Caveat:** this is still compile-probe work only. No full `pythoncore.dll`/`python.exe` build, no successful link, no Wine launch, and no Windows 98 runtime execution is claimed.

## Files changed in this revision (`getpath.c` first VC6/C89 helper slice)

All still uncommitted; nothing in this list has been pushed anywhere.

- `cpython/Modules/getpath.c` — advanced the first `Modules/getpath.c` pythoncore frontier slice by moving early helper declarations to C89/VC6-safe declaration groups while preserving assignment timing after argument parsing and other checks. Covered `getpath_abspath()`, `getpath_basename()`, `getpath_dirname()`, `getpath_hassuffix()`, Windows file-attribute helpers (`isdir`/`isfile`/`isxfile`), `getpath_joinpath()`, `getpath_readlines()`, `funcs_to_dict()`, `decode_to_dict()`, `env_to_dict()`, and `winmodule_to_dict()`.
- `cpython/Modules/getpath.c` — added a narrow VC6/old-SDK fallback for missing `INVALID_FILE_ATTRIBUTES`, guarded as `defined(_MSC_VER) && _MSC_VER < 1300 && !defined(INVALID_FILE_ATTRIBUTES)` under `MS_WINDOWS` after including `<windows.h>`.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from `git -C cpython diff` so the project-local compatibility patch includes this `getpath.c` slice plus prior uncommitted compatibility edits.
- `PORT_STATUS.md` — this revision.

**Command results (all reproduced in this revision):**

| Command | Result |
|---|---|
| `bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh` | exit 0 — public probe suite, core probe suite, PathCch shim suite, getpath frozen-header generator suite, and pythoncore frontier regression suite all passed. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | exit 2 — `Modules/getpath.c` gets past the prior line-66 `Py_ssize_t len` blocker, the immediate helper declaration-order blockers, and the old-SDK `INVALID_FILE_ATTRIBUTES` blocker. New exact first blocker is `build\\generated\\cpython\\Modules\\getpath.c(887) : error C2275: 'PyObject' : illegal use of this type as an expression` at `PyObject *configDict = _PyConfig_AsDict(config);` in `_PyConfig_InitPathConfig()`, followed by the same function's later C89 declaration-order fallout. Summary: `total=1 compiled=0 cached=0 skipped=0`. |
| `git -C cpython worktree add --detach ../build/verify-vc6-patch-worktree v3.11.16 && git -C build/verify-vc6-patch-worktree apply --check ../../compat/msvc600/cpython-3.11.16-vc6-headers.patch` | exit 0 — regenerated compatibility patch applies cleanly to a pristine detached `v3.11.16` worktree. |

**Current pythoncore compile-frontier status:** the first bounded `getpath.c` helper declaration-order/old-SDK slice is complete and verified. The frontier still starts at `Modules/getpath.c`, but the next blocker has advanced into `_PyConfig_InitPathConfig()`'s main path-calculation body.

**Caveat:** this is still compile-probe work only. No full `pythoncore.dll`/`python.exe` build, no successful link, no Wine launch, and no Windows 98 runtime execution is claimed.

## Files changed in this revision (generated `getpath.h` provisioning)

All still uncommitted; nothing in this list has been pushed anywhere.

- `scripts/generate-getpath-frozen.sh` — new reproducible project-local generation step for `Python/frozen_modules/getpath.h`. It invokes CPython's documented `Programs/_freeze_module.py getpath Modules/getpath.py ...` path with host `python3` and writes only to ignored `build/generated/cpython/Python/frozen_modules/getpath.h`.
- `scripts/generate-getpath-frozen.test.sh` — new regression coverage for the generated path and header format: verifies the `_freeze_module.py` banner, `_Py_M__getpath` symbol, 16-byte line formatting, unmarshaled `<frozen getpath>` code object, and byte-for-byte equality with a direct `Programs/_freeze_module.py` invocation.
- `scripts/vc6-probe-pythoncore-frontier.sh` — now provisions the generated getpath header before live VC6 compilation and compiles `Modules/getpath.c` from an ignored generated cpython-shaped source copy so its relative `../Python/frozen_modules/getpath.h` include resolves without tracking generated output.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — live integration check now rejects a stale missing-`getpath.h` blocker and verifies the frontier harness created the ignored generated header.
- `PORT_STATUS.md` — this revision.

**Command results (all reproduced in this revision):**

| Command | Result |
|---|---|
| `chmod +x scripts/generate-getpath-frozen.sh scripts/generate-getpath-frozen.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash -n scripts/generate-getpath-frozen.sh scripts/generate-getpath-frozen.test.sh scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh` | exit 0 — generator format/path regression passed and frontier regression passed, including live provisioning of `build/generated/cpython/Python/frozen_modules/getpath.h`. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | exit 2 — `Modules/getpath.c` now gets past both `<pathcch.h>` and the generated `../Python/frozen_modules/getpath.h` include. It stops at the next honest VC6/C89 compile blocker: mixed declarations in `getpath.c`, first diagnostic `build\\generated\\cpython\\Modules\\getpath.c(66) : error C2275: 'Py_ssize_t' : illegal use of this type as an expression`, followed by more declaration-order errors and `INVALID_FILE_ATTRIBUTES` not being declared before the compiler reaches its 100-error cap. Summary: `total=1 compiled=0 cached=0 skipped=0`. |

**Current pythoncore compile-frontier status:** generated frozen `getpath.h` is now reproducibly provisioned from CPython source into ignored build output and integrated into the frontier harness. The current first blocker remains `Modules/getpath.c`, now at VC6/C89 declaration-order and old-SDK constant compatibility work rather than missing generated input.

**Caveat:** this is still compile-probe work only. No full `pythoncore.dll`/`python.exe` build, no successful link, no Wine launch, and no Windows 98 runtime execution is claimed.

## Files changed in previous revision (VC6 `PathCchFindExtension` shim)

All still uncommitted; nothing in this list has been pushed anywhere.

- `compat/msvc600/pathcch.h` — new VC6-scoped project-local compatibility header that implements only `PathCchFindExtension(PCWSTR, size_t, PCWSTR *)` for the existing `Modules/getpath.c` use. It scans a null-terminated wide path within `cchPath`, returns the last `.` after the last `\\`, `/`, or `:` separator, returns the terminating NUL when no extension is present, and returns `E_INVALIDARG` for null arguments, zero `cchPath`, or a too-small count with no NUL.
- `scripts/fixtures/vc6_pathcch_smoke.c` — focused compile fixture covering `.exe`, no extension, a dot in a directory name, dotfiles, trailing directory separators, multiple suffixes, and invalid/too-small arguments.
- `scripts/vc6-probe-pathcch.test.sh` — new regression test for the shim and fixture under the VC6 probe when Wine/MSVC600 are available.
- `PORT_STATUS.md` — this revision.

**Command results (all reproduced in this revision):**

| Command | Result |
|---|---|
| `chmod +x scripts/vc6-probe-pathcch.test.sh && bash -n scripts/vc6-probe-pathcch.test.sh scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-minlink.sh scripts/vc6-probe-core.sh scripts/vc6-probe.sh` | exit 0 |
| `bash scripts/vc6-probe-pathcch.test.sh` | exit 0, `ALL TESTS PASSED` — 4/4 checks `ok`; the smoke fixture compiles under VC6 and no longer hits missing `pathcch.h`. |
| `bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh` | exit 0 — public probe suite, core probe suite, pathcch smoke suite, and frontier regression suite all passed. |
| `VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | exit 2 — `Modules/getpath.c` now gets past `<pathcch.h>` and stops at the next honest blocker: `cpython\\Modules\\getpath.c(22) : fatal error C1083: Cannot open include file: '../Python/frozen_modules/getpath.h': No such file or directory`. Summary: `total=1 compiled=0 cached=0 skipped=0`. |

**Current pythoncore compile-frontier status:** the narrow `PathCchFindExtension` compatibility needed by `Modules/getpath.c` is implemented and verified under VC6 compile probes. The next blocker in full project order is the missing generated/frozen header `Python/frozen_modules/getpath.h` required by `Modules/getpath.c`; this is separate from the PathCch API gap. No `CompareStringOrdinal` blocker has been reached yet.

**Caveat:** this is still compile-probe work only. No full `pythoncore.dll`/`python.exe` build, no successful link, no Wine launch, and no Windows 98 runtime execution is claimed.

## Files changed in previous revision (source-list-driven pythoncore compile frontier)

All still uncommitted; nothing in this list has been pushed anywhere.

- `scripts/vc6-probe-pythoncore-frontier.sh` — new project-local pythoncore compile-frontier harness. It parses `cpython/PCbuild/pythoncore.vcxproj`'s 198 `<ClCompile>` entries, normalizes Windows-style paths to project-local `cpython/...` paths, compiles supported sources incrementally, preserves common/per-file defines, reports external/generated sources, and stops on the first VC6 front-end blocker with `cl.exe`'s real status.
- `scripts/vc6-probe-pythoncore-frontier.test.sh` — new regression test covering source-list parsing, path normalization, per-file define preservation, unsupported/generated/external reporting, and a bounded live first-source VC6 run when Wine/MSVC600 are present.
- `PORT_STATUS.md` — that revision.

**Command results (previous revision):**

| Command | Result |
|---|---|
| `for f in scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-minlink.sh scripts/vc6-probe-core.sh; do bash -n "$f" || exit $?; done` | exit 0 |
| `bash scripts/vc6-probe-pythoncore-frontier.test.sh` | exit 0, `ALL TESTS PASSED` — 12/12 checks `ok` |
| `bash scripts/vc6-probe-pythoncore-frontier.sh` | exit 2 — generated the source list, began with `cpython/Modules/getpath.c`, preserved its per-file defines, invoked VC6 `cl.exe`, and stopped truthfully at the first blocker: missing `pathcch.h` at `Modules/getpath.c(14)`. |
| `bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh` | exit 0 — public probe suite, core probe suite, and new frontier suite all passed. |
| `bash scripts/vc6-probe-minlink.sh` | exit 96 — unchanged minimal link-frontier behavior: all four selected translation units compile, then `LINK.EXE` fails with `fatal error LNK1120: 267 unresolved externals`. |

**Previous pythoncore compile-frontier status:** source-list-driven frontier infrastructure was implemented and verified. The first actionable VC6 compile blocker in full project order was `Modules/getpath.c` requiring `pathcch.h`, a modern Windows SDK header not present in the VC6/MSVC600 include set.

**Caveat:** this was a compile-frontier harness only. No full `pythoncore.dll`/`python.exe` build, no successful link, no Wine launch, and no Windows 98 runtime execution was claimed.

## Files changed in previous revision (minimal VC6 link-frontier probe)

All still uncommitted; nothing in this list has been pushed anywhere.

- `scripts/vc6-probe-minlink.sh` — new project-local link-frontier harness. It reuses the existing Wine/MSVC600 helpers, compiles `Programs/python.c` plus the three currently clean core translation units (`Modules/main.c`, `Python/pylifecycle.c`, and `Python/pystate.c`) with pythoncore-style core/shared defines, then invokes VC6 `LINK.EXE` for a minimal `python-min.exe` attempt. This is intentionally not a full `pythoncore.vcxproj` build; `pythoncore.vcxproj` lists 198 C sources (without externals disabled: plus zlib-conditioned entries), while `python.vcxproj` only contributes `Programs/python.c` and references the core project.
- `PORT_STATUS.md` — this revision.

**Command results (all reproduced in this revision):**

| Command | Result |
|---|---|
| `bash scripts/vc6-probe-minlink.sh` | exit 96 — all four frontier translation units compile under VC6, then `LINK.EXE` runs and fails truthfully with `fatal error LNK1120: 267 unresolved externals`. First unresolved symbols include `__PyPathConfig_ComputeSysPath0` / `__PyPathConfig_UpdateGlobal` (`Python/pathconfig.c`), `__Py_Dealloc` (`Objects/object.c`), `_PyErr_Print` (`Python/pythonrun.c`), and `PyStatus_Ok` (`Python/initconfig.c`). |
| `bash scripts/vc6-probe.test.sh` | exit 0, `ALL TESTS PASSED` — 6/6 checks `ok` |
| `bash scripts/vc6-probe-core.test.sh` | exit 0, `ALL TESTS PASSED` — existing core compile-probe regression checks still pass after adding the link-frontier script |

**Current minimal-link status:** the first post-core-probe link milestone is now implemented as a reproducible harness that reaches the VC6 linker. A successful link is not feasible from only the already-clean TUs: the exact blocker is the expected unresolved-symbol frontier caused by not yet compiling the rest of `pythoncore.vcxproj`'s source graph. Recommended next artifact is a source-list-driven VC6 `pythoncore` compile frontier (generate/consume the `pythoncore.vcxproj` `<ClCompile>` list, with per-file defines such as `getpath.c` and `sysmodule.c` handled explicitly) that compiles additional core objects one at a time before attempting a real `pythoncore`/`python.exe` link.

**Caveat:** this is a link-frontier probe only. No `pythoncore.dll`/full `python.exe` build, no Wine launch, and no Windows 98 runtime execution is claimed.

## Files changed in previous revision (`pystate.c` final tail helper C89 declaration-hoist slice)

All still uncommitted; nothing in this list has been pushed anywhere.

- `cpython/Python/pystate.c` — `_Py_GetConfig()` now declares `PyThreadState *tstate` in the function opening declaration group while preserving the `assert(PyGILState_Check())` before assigning `tstate = _PyThreadState_GET()`. `push_chunk()` now declares `_PyStackChunk *new` and `PyObject **res` in its opening declaration group while preserving the allocation-size loop, `allocate_chunk(...)` assignment point, chunk linking/top/limit updates, root-chunk offset, and returned stack pointer. `_PyThreadState_PopFrame()` now declares `PyObject **base` in the function opening declaration group while preserving the datastack assertion before assigning `base = (PyObject **)frame`, plus the chunk-pop and top-reset paths. `_PyThreadState_BumpFramePointerSlow()`'s inner block declaration was not changed.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from `git -C cpython diff` (3703 lines); includes this slice plus earlier uncommitted compatibility edits. Reproducibility check: `git apply --check` against a pristine temporary `v3.11.16` `cpython/` worktree exited 0.
- `PORT_STATUS.md` — this revision.

**Command results (all reproduced in this revision):**

| Command | Result |
|---|---|
| `bash scripts/vc6-probe.test.sh` | exit 0, `ALL TESTS PASSED` — 6/6 checks `ok` |
| `bash scripts/vc6-probe-core.test.sh` | exit 0, `ALL TESTS PASSED` — 28/28 checks `ok`; `Modules/main.c` compiles cleanly end-to-end (compile-only) |
| `bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c` | exit 0 — still compiles cleanly after the final tail-helper declaration-hoist slice |
| `bash scripts/vc6-probe-core.sh cpython/Python/pystate.c` | exit 0 — gets past the prior line 3405 (`PyThreadState *tstate = _PyThreadState_GET();`) blocker in `_Py_GetConfig()`, the `push_chunk()` declaration-order blockers at line 3418 (`_PyStackChunk *new = allocate_chunk(...)`) and line 3431 (`PyObject **res = &new->data[...]`), and the follow-on line 3460 (`PyObject **base = (PyObject **)frame;`) blocker in `_PyThreadState_PopFrame()`. No next C89 declaration blocker is currently exposed by the `pystate.c` compile probe; the only diagnostic left in this probe output is the pre-existing line 3361 warning (`warning C4550: expression evaluates to a function which is missing an argument list`). |
| `git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch` against pristine `v3.11.16` tree | exit 0 |

**Caveat:** this is still compile-probe work only. No link, no `pythoncore`/`python.exe` build, no Wine launch, and no Windows 98 runtime execution was attempted or claimed.


## Files changed in previous revision (`pystate.c` PyGILState_Check/Ensure C89 declaration-hoist slice)

All still uncommitted; nothing in this list has been pushed anywhere.

- `cpython/Python/pystate.c` — hoists `PyGILState_Check()`'s `PyThreadState *tstate` into the function opening declaration group while preserving the early `check_enabled` and TSS-created returns before assigning `tstate = _PyRuntimeGILState_GetThreadState(gilstate)`. `PyGILState_Ensure()` now declares `PyThreadState *tcur` and `int current` in the opening declaration group, keeps `tcur = PyThread_tss_get(...)` after the initialization assertions, and leaves the new/current thread-state branches, restore/save ordering, counter update, and return value unchanged.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from `git -C cpython diff`; includes this slice plus earlier uncommitted compatibility edits. Reproducibility check: `git apply --check` against a pristine temporary `v3.11.16` `cpython/` worktree exited 0.
- `PORT_STATUS.md` — this revision.

**Command results (all reproduced in this revision):**

| Command | Result |
|---|---|
| `bash scripts/vc6-probe.test.sh` | exit 0, `ALL TESTS PASSED` — 6/6 checks `ok` |
| `bash scripts/vc6-probe-core.test.sh` | exit 0, `ALL TESTS PASSED` — 28/28 checks `ok`; `Modules/main.c` still compiles cleanly |
| `bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c` | exit 0 — still compiles cleanly after the `PyGILState_Check()`/`PyGILState_Ensure()` declaration-hoist slice |
| `bash scripts/vc6-probe-core.sh cpython/Python/pystate.c` | exit 2 — gets past the prior line 2886 (`error C2275: 'PyThreadState' : illegal use of this type as an expression`) blocker at `PyThreadState *tstate = _PyRuntimeGILState_GetThreadState(gilstate);` in `PyGILState_Check()` and the adjacent `PyGILState_Ensure()` declaration-order fallout. New exact first blocker is line 3052 (`error C2059: syntax error : '{'`) at `*data = (_PyCrossInterpreterData){0};` in `_PyObject_GetCrossInterpreterData()`, followed by line 3057 `crossinterpdatafunc getdata = _lookup_getdata(obj);`, line 3062 `int res = getdata(obj, data);`, and later cross-interpreter-data helper declaration-order fallout. |
| `git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch` against pristine `v3.11.16` tree | exit 0 |

**Caveat:** this is still compile-probe work only. No link, no `pythoncore`/`python.exe` build, no Wine launch, and no Windows 98 runtime execution was attempted or claimed.

## Files changed in previous revision (`pystate.c` frame access and async-exception C89 declaration-hoist slice)

All still uncommitted; nothing in this list has been pushed anywhere.

- `cpython/Python/pystate.c` — hoists `PyThreadState_GetFrame()`'s `_PyInterpreterFrame *f` and `PyFrameObject *frame` declarations into the function's opening declaration group while preserving the `f = tstate->cframe->current_frame` assignment immediately after the assert and the `frame = _PyFrame_GetFrameObject(f)` assignment after the NULL check. `PyThreadState_SetAsyncExc()` now declares `PyThreadState *tstate` in the function opening group and uses `for (tstate = ...; ...)`; its loop body declares `PyObject *old_exc` before the skip check and assigns it at the original point before the async exception replacement, preserving head-lock traversal, skip behavior, unlock-before-decref, signal, and return paths.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from `git -C cpython diff`; includes this slice plus earlier uncommitted compatibility edits. Reproducibility check: `git apply --check` against a pristine temporary `v3.11.16` `cpython/` worktree exited 0.
- `PORT_STATUS.md` — this revision.

**Command results (all reproduced in this revision):**

| Command | Result |
|---|---|
| `bash scripts/vc6-probe.test.sh` | exit 0, `ALL TESTS PASSED` — 6/6 checks `ok` |
| `bash scripts/vc6-probe-core.test.sh` | exit 0, `ALL TESTS PASSED` — 32/32 checks `ok`; `Modules/main.c` still compiles cleanly |
| `bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c` | exit 0 — still compiles cleanly after the frame access and async-exception declaration-hoist slice |
| `bash scripts/vc6-probe-core.sh cpython/Python/pystate.c` | exit 2 — gets past the prior `PyThreadState_GetFrame()` blockers at line 2457 (`_PyInterpreterFrame *f = tstate->cframe->current_frame;`) and line 2464 (`PyFrameObject *frame = _PyFrame_GetFrameObject(f);`), plus `PyThreadState_SetAsyncExc()`'s C99 `for (PyThreadState *tstate = ...)` initializer and post-`if` `PyObject *old_exc` loop-body declaration. New exact first blocker is line 2576 (`error C2275: 'PyObject' : illegal use of this type as an expression`) at `PyObject *result = PyDict_New();` in `_PyThread_CurrentFrames()`, followed by line 2582 (`int gc_was_enabled = PyGC_Disable();`) and later declaration-order fallout. |
| `git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch` against pristine `v3.11.16` tree | exit 0 |

**Caveat:** this is still compile-probe work only. No link, no `pythoncore`/`python.exe` build, no Wine launch, and no Windows 98 runtime execution was attempted or claimed.

## Files changed in previous revision (`pystate.c` thread-state deletion helpers C89 declaration-hoist slice)

All still uncommitted; nothing in this list has been pushed anywhere.

- `cpython/Python/pystate.c` — hoists the thread-state deletion helper locals needed by VC6/C89: `tstate_delete_common()` now declares `PyInterpreterState *interp`, `_PyRuntimeState *runtime`, and `_PyStackChunk *chunk` in the opening declaration group while assigning them at their original post-ensure/post-TSS points; `_PyThreadState_DeleteCurrent()` declares `struct _gilstate_runtime_state *gilstate` before `_Py_EnsureTstateNotNULL()` and assigns it immediately after; `_PyThreadState_DeleteExcept()` declares `PyThreadState *list`, `p`, and `next` before `HEAD_LOCK(runtime)` while preserving the locked list capture/unlinking and post-unlock clear/free loop. The stack-chunk loop's block-local `prev` remains at the start of its `while` block.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from `git -C cpython diff`; includes this slice plus earlier uncommitted compatibility edits. Reproducibility check: `git apply --check` against a pristine temporary `v3.11.16` `cpython/` worktree exited 0.
- `PORT_STATUS.md` — this revision.

**Command results (all reproduced in this revision):**

| Command | Result |
|---|---|
| `bash scripts/vc6-probe.test.sh` | exit 0, `ALL TESTS PASSED` — 6/6 checks `ok` |
| `bash scripts/vc6-probe-core.test.sh` | exit 0, `ALL TESTS PASSED` — 32/32 checks `ok`; `Modules/main.c` still compiles cleanly |
| `bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c` | exit 0 — still compiles cleanly after the thread-state deletion helper declaration-hoist slice |
| `bash scripts/vc6-probe-core.sh cpython/Python/pystate.c` | exit 2 — gets past the prior `tstate_delete_common()` blockers at line 2245 (`PyInterpreterState *interp = tstate->interp;`), line 2249 (`_PyRuntimeState *runtime = interp->runtime;`), and line 2268 (`_PyStackChunk *chunk = tstate->datastack_chunk;`), plus `_PyThreadState_DeleteCurrent()`'s post-ensure `gilstate` declaration and `_PyThreadState_DeleteExcept()`'s post-lock `list` declaration. New exact first blocker is line 2457 (`error C2143: syntax error : missing ';' before 'type'`) at `_PyInterpreterFrame *f = tstate->cframe->current_frame;` in `PyThreadState_GetFrame()`, followed by line 2464 (`PyFrameObject *frame = _PyFrame_GetFrameObject(f);`) and later declaration-order fallout. |
| `git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch` against pristine `v3.11.16` tree | exit 0 |

**Caveat:** this is still compile-probe work only. No link, no `pythoncore`/`python.exe` build, no Wine launch, and no Windows 98 runtime execution was attempted or claimed.

## Files changed in previous revision (`pystate.c` new_threadstate C89 declaration-hoist slice)

All still uncommitted; nothing in this list has been pushed anywhere.

- `cpython/Python/pystate.c` — hoists `new_threadstate()`'s `PyThreadState *new_tstate`, `uint64_t id`, and `PyThreadState *old_head` declarations into the function's opening declaration group. `new_tstate = alloc_threadstate()` remains before the lock, `id = interp->threads.next_unique_id` remains after the locked increment, and `old_head = interp->threads.head` remains immediately before the `old_head == NULL` branch, preserving allocation-before-lock, `used_newtstate` behavior, initialization branches, and lock/unlock order.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from `git -C cpython diff`; includes this slice plus earlier uncommitted compatibility edits. Reproducibility check: `git apply --check` against a pristine temporary `v3.11.16` `cpython/` worktree exited 0.
- `PORT_STATUS.md` — this revision.

**Command results (all reproduced in this revision):**

| Command | Result |
|---|---|
| `bash scripts/vc6-probe.test.sh` | exit 0, `ALL TESTS PASSED` — 6/6 checks `ok` |
| `bash scripts/vc6-probe-core.test.sh` | exit 0, `ALL TESTS PASSED` — 32/32 checks `ok`; `Modules/main.c` still compiles cleanly |
| `bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c` | exit 0 — still compiles cleanly after the `new_threadstate()` declaration-hoist slice |
| `bash scripts/vc6-probe-core.sh cpython/Python/pystate.c` | exit 2 — gets past the prior `new_threadstate()` blockers at line 1970 (`uint64_t id = interp->threads.next_unique_id;`) and line 1973 (`PyThreadState *old_head = interp->threads.head;`). New exact first blocker is line 2080 (`error C2275: 'PyInterpreterState' : illegal use of this type as an expression`) at `PyInterpreterState *interp = tstate->interp;` in `_PyState_AddModule()`, followed by declaration-order fallout for `interp` and later locals. |
| `git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch` against pristine `v3.11.16` tree | exit 0 |

**Caveat:** this is still compile-probe work only. No link, no `pythoncore`/`python.exe` build, no Wine launch, and no Windows 98 runtime execution was attempted or claimed.

## Files changed in previous revision (`pystate.c` _PyInterpreterState_IDDecref C89 declaration-hoist slice)

All still uncommitted; nothing in this list has been pushed anywhere.

- `cpython/Python/pystate.c` — hoists `_PyInterpreterState_IDDecref()`'s `struct _gilstate_runtime_state *gilstate`, `int64_t refcount`, `PyThreadState *tstate`, and `PyThreadState *save_tstate` declarations to the function's opening declaration group. `gilstate = &_PyRuntime.gilstate` remains immediately after the `id_mutex` assert; `refcount = interp->id_refcount` remains after the decrement while the mutex is still held; `tstate` and `save_tstate` assignments remain inside the `refcount == 0 && interp->requires_idref` block, preserving lock acquisition/release plus `_PyThreadState_Swap()`/`Py_EndInterpreter()` ordering.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from `git -C cpython diff`; includes this slice plus earlier uncommitted compatibility edits. Reproducibility check: `git apply --check` against a pristine temporary `v3.11.16` `cpython/` worktree exited 0.
- `PORT_STATUS.md` — this revision.

**Command results (all reproduced in this revision):**

| Command | Result |
|---|---|
| `bash scripts/vc6-probe.test.sh` | exit 0, `ALL TESTS PASSED` — 6/6 checks `ok` |
| `bash scripts/vc6-probe-core.test.sh` | exit 0, `ALL TESTS PASSED` — 28/28 checks `ok`; `Modules/main.c` still compiles cleanly |
| `bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c` | exit 0 — still compiles cleanly after the `_PyInterpreterState_IDDecref()` declaration-hoist slice |
| `bash scripts/vc6-probe-core.sh cpython/Python/pystate.c` | exit 2 — gets past the prior `_PyInterpreterState_IDDecref()` blockers at line 1812 (`struct _gilstate_runtime_state *gilstate = &_PyRuntime.gilstate;`), line 1816 (`int64_t refcount = interp->id_refcount;`), and the block-local `tstate`/`save_tstate` declarations. New exact first blocker is line 1876 (`error C2143: syntax error : missing ';' before 'type'`) at `_PyStackChunk *res = _PyObject_VirtualAlloc(size_in_bytes);` in `allocate_chunk()`, followed by declaration-order fallout for `res`. |
| `git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch` against pristine `v3.11.16` tree | exit 0 |

**Caveat:** this is still compile-probe work only. No link, no `pythoncore`/`python.exe` build, no Wine launch, and no Windows 98 runtime execution was attempted or claimed.

## Files changed in previous revision (`pystate.c` PyInterpreterState_Get C89 declaration-hoist slice)

All still uncommitted; nothing in this list has been pushed anywhere.

- `cpython/Python/pystate.c` — hoists `PyInterpreterState_Get()`'s `PyInterpreterState *interp` declaration beside the existing `PyThreadState *tstate` local. `tstate = _PyThreadState_GET()` remains immediately before `_Py_EnsureTstateNotNULL(tstate)`, and `interp = tstate->interp` remains at the original post-ensure point, preserving the fatal-error check and return behavior.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from `git -C cpython diff`; includes this slice plus earlier uncommitted compatibility edits. Reproducibility check: `git apply --check` against a pristine temporary `v3.11.16` `cpython/` worktree exited 0.
- `PORT_STATUS.md` — this revision.

**Command results (all reproduced in this revision):**

| Command | Result |
|---|---|
| `bash scripts/vc6-probe.test.sh` | exit 0, `ALL TESTS PASSED` — 6/6 checks `ok` |
| `bash scripts/vc6-probe-core.test.sh` | exit 0, `ALL TESTS PASSED` — 28/28 checks `ok`; `Modules/main.c` still compiles cleanly |
| `bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c` | exit 0 — still compiles cleanly after the `PyInterpreterState_Get()` declaration-hoist slice |
| `bash scripts/vc6-probe-core.sh cpython/Python/pystate.c` | exit 2 — gets past the prior `PyInterpreterState_Get()` blocker at line 1719 (`PyInterpreterState *interp = tstate->interp;`). New exact first blocker is line 1812 (`error C2143: syntax error : missing ';' before 'type'`) at `struct _gilstate_runtime_state *gilstate = &_PyRuntime.gilstate;` in `_PyInterpreterState_IDDecref()`, followed by line 1816 `int64_t refcount = interp->id_refcount;` and later declaration-order fallout. |
| `git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch` against pristine `v3.11.16` tree | exit 0 |

**Caveat:** this is still compile-probe work only. No link, no `pythoncore`/`python.exe` build, no Wine launch, and no Windows 98 runtime execution was attempted or claimed.

## Files changed in previous revision (`pystate.c` PyInterpreterState_Delete C89 declaration-hoist slice)

All still uncommitted; nothing in this list has been pushed anywhere.

- `cpython/Python/pystate.c` — hoists `PyInterpreterState_Delete()`'s `PyInterpreterState **p` declaration beside the existing `runtime` and `interpreters` locals. The `for (p = &interpreters->head; ...)` initializer remains under `HEAD_LOCK(runtime)`, preserving the unlink search, remaining-thread checks, main-interpreter checks, assignment to `*p`, and lock/unlock ordering.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from `git -C cpython diff`; includes this slice plus earlier uncommitted compatibility edits. Reproducibility check: `git apply --check` against a pristine temporary `v3.11.16` `cpython/` worktree exited 0.
- `PORT_STATUS.md` — this revision.

**Command results (all reproduced in this revision):**

| Command | Result |
|---|---|
| `bash scripts/vc6-probe.test.sh` | exit 0, `ALL TESTS PASSED` — 6/6 checks `ok` |
| `bash scripts/vc6-probe-core.test.sh` | exit 0, `ALL TESTS PASSED` — 28/28 checks `ok`; `Modules/main.c` still compiles cleanly |
| `bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c` | exit 0 — still compiles cleanly after the `PyInterpreterState_Delete()` declaration-hoist slice |
| `bash scripts/vc6-probe-core.sh cpython/Python/pystate.c` | exit 2 — gets past the prior `PyInterpreterState_Delete()` blocker at line 1638 (`PyInterpreterState **p;`). New exact first blocker is line 1719 (`error C2275: 'PyInterpreterState' : illegal use of this type as an expression`) at `PyInterpreterState *interp = tstate->interp;` in `PyInterpreterState_Get()`, followed by declaration-order fallout in the same and later functions. |
| `git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch` against pristine `v3.11.16` tree | exit 0 |

**Caveat:** this is still compile-probe work only. No link, no `pythoncore`/`python.exe` build, no Wine launch, and no Windows 98 runtime execution was attempted or claimed.

## Files changed in previous revision (`pystate.c` interpreter_clear C89 declaration-hoist slice)

All still uncommitted; nothing in this list has been pushed anywhere.

- `cpython/Python/pystate.c` — hoists `interpreter_clear()`'s `PyThreadState *p` declaration beside the existing `_PyRuntimeState *runtime` local. The `p = interp->threads.head;` assignment remains at the same point under `HEAD_LOCK(runtime)`, preserving the lock/unlock ordering and the thread-clear loop behavior.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from `git -C cpython diff`; includes this slice plus earlier uncommitted compatibility edits. Reproducibility check: `git apply --check` against a pristine temporary `v3.11.16` `cpython/` worktree exited 0.
- `PORT_STATUS.md` — this revision.

**Command results (all reproduced in this revision):**

| Command | Result |
|---|---|
| `bash scripts/vc6-probe.test.sh` | exit 0, `ALL TESTS PASSED` — 6/6 checks `ok` |
| `bash scripts/vc6-probe-core.test.sh` | exit 0, `ALL TESTS PASSED` — 28/28 checks `ok`; `Modules/main.c` still compiles cleanly |
| `bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c` | exit 0 — still compiles cleanly after the `interpreter_clear()` declaration-hoist slice |
| `bash scripts/vc6-probe-core.sh cpython/Python/pystate.c` | exit 2 — gets past the prior `interpreter_clear()` blocker at line 1537 (`PyThreadState *p = interp->threads.head;`). New exact first blocker is line 1638 (`error C2275: 'PyInterpreterState' : illegal use of this type as an expression`) at `PyInterpreterState **p;` in `PyInterpreterState_Delete()`, followed by declaration-order fallout in the same and later functions. |
| `git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch` against pristine `v3.11.16` tree | exit 0 |

**Caveat:** this is still compile-probe work only. No link, no `pythoncore`/`python.exe` build, no Wine launch, and no Windows 98 runtime execution was attempted or claimed.

## Files changed in previous revision (`pystate.c` PyInterpreterState_New C89 declaration-hoist slice)

All still uncommitted; nothing in this list has been pushed anywhere.

- `cpython/Python/pystate.c` — hoists `PyInterpreterState_New()`'s `PyThreadState *tstate`, `PyThread_type_lock pending_lock`, `_PyRuntimeState *runtime`, `struct pyinterpreters *interpreters`, `int64_t id`, and `PyInterpreterState *old_head` declarations into the function's opening declaration group. `tstate = _PyThreadState_GET()` remains immediately before the audit, and the `pending_lock`, `runtime`, `interpreters`, `id`, and `old_head` assignments stay at the original execution points after the audit, after lock allocation succeeds, after `HEAD_LOCK(runtime)`, and before the `old_head == NULL` test respectively.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from `git -C cpython diff`; includes this slice plus earlier uncommitted compatibility edits. Reproducibility check: `git apply --check` against a pristine temporary `v3.11.16` `cpython/` worktree exited 0.
- `PORT_STATUS.md` — this revision.

**Command results (all reproduced in this revision):**

| Command | Result |
|---|---|
| `bash scripts/vc6-probe.test.sh` | exit 0, `ALL TESTS PASSED` — 6/6 checks `ok` |
| `bash scripts/vc6-probe-core.test.sh` | exit 0, `ALL TESTS PASSED` — 28/28 checks `ok`; `Modules/main.c` still compiles cleanly |
| `bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c` | exit 0 — still compiles cleanly after the `PyInterpreterState_New()` declaration-hoist slice |
| `bash scripts/vc6-probe-core.sh cpython/Python/pystate.c` | exit 2 — gets past the prior `PyInterpreterState_New()` blockers at line 1438 (`PyThread_type_lock pending_lock = PyThread_allocate_lock();`) and its `runtime`, `interpreters`, `id`, and `old_head` declaration-order fallout. New exact first blocker is line 1537 (`error C2275: 'PyThreadState' : illegal use of this type as an expression`) at `PyThreadState *p = interp->threads.head;` in `interpreter_clear()`, followed by later declaration-order fallout in the same translation unit. |
| `git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch` against pristine `v3.11.16` tree | exit 0 |

**Caveat:** this is still compile-probe work only. No link, no `pythoncore`/`python.exe` build, no Wine launch, and no Windows 98 runtime execution was attempted or claimed.

## Files changed in previous revision (`pystate.c` alloc_for_runtime lock C89 declaration-hoist slice)

All still uncommitted; nothing in this list has been pushed anywhere.

- `cpython/Python/pystate.c` — hoists `alloc_for_runtime()`'s `PyThread_type_lock lock1`, `lock2`, and `lock3` declarations beside `PyMemAllocatorEx old_alloc`. The three `PyThread_allocate_lock()` calls remain at their original execution points as assignments; the existing NULL checks, `lock1`/`lock2` cleanup order, allocator restoration, output assignments, and return paths are unchanged.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from `git -C cpython diff`; includes this slice plus earlier uncommitted compatibility edits. Reproducibility check: `git apply --check` against a pristine temporary `v3.11.16` `cpython/` worktree exited 0.
- `PORT_STATUS.md` — this revision.

**Command results (all reproduced in this revision):**

| Command | Result |
|---|---|
| `bash scripts/vc6-probe.test.sh` | exit 0, `ALL TESTS PASSED` — 6/6 checks `ok` |
| `bash scripts/vc6-probe-core.test.sh` | exit 0, `ALL TESTS PASSED` — 28/28 checks `ok`; `Modules/main.c` still compiles cleanly |
| `bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c` | exit 0 — still compiles cleanly after the `pystate.c` lock declaration slice |
| `bash scripts/vc6-probe-core.sh cpython/Python/pystate.c` | exit 2 — gets past the prior `alloc_for_runtime()` blockers at lines 1185/1190/1196 (`PyThread_type_lock lock1/lock2/lock3 = PyThread_allocate_lock();`). New exact first blocker is line 1438 (`error C2275: 'PyThread_type_lock' : illegal use of this type as an expression`) at `PyThread_type_lock pending_lock = PyThread_allocate_lock();` in `PyInterpreterState_New()`, followed by that function's `runtime`, `interpreters`, `id`, and `old_head` declaration-order fallout. |
| `git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch` against pristine `v3.11.16` tree | exit 0 |

**Caveat:** this is still compile-probe work only. No link, no `pythoncore`/`python.exe` build, no Wine launch, and no Windows 98 runtime execution was attempted or claimed.

## Files changed in previous revision (`pycore_frame.h` frame inline C89 declaration-hoist slice)

All still uncommitted; nothing in this list has been pushed anywhere.

- `cpython/Include/internal/pycore_frame.h` — hoists the first VC6/C89 mixed-declaration blockers exposed while compiling `Python/pystate.c`: `_PyFrame_GetFrameObject()` now declares `PyFrameObject *res` before the `assert()` and assigns `frame->frame_obj` at the original point; `_PyThreadState_BumpFramePointer()` keeps `_PyInterpreterFrame *res` scoped inside the stack-space `if` block but declares it before the assignment; `_PyFrame_GetGenerator()` declares `size_t offset_in_gen` before the `assert()` and assigns `offsetof(PyGenObject, gi_iframe)` at the original point.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from `git -C cpython diff`; includes this slice plus earlier uncommitted compatibility edits. Reproducibility check: `git apply --check` against a pristine temporary `v3.11.16` `cpython/` worktree exited 0.
- `PORT_STATUS.md` — this revision.

**Command results (all reproduced in this revision):**

| Command | Result |
|---|---|
| `bash scripts/vc6-probe.test.sh` | exit 0, `ALL TESTS PASSED` — 6/6 checks `ok` |
| `bash scripts/vc6-probe-core.test.sh` | exit 0, `ALL TESTS PASSED` — 28/28 checks `ok`; `Modules/main.c` still compiles cleanly |
| `bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c` | exit 0 — still compiles cleanly after the header slice |
| `bash scripts/vc6-probe-core.sh cpython/Python/pystate.c` | exit 2 — gets past the prior `pycore_frame.h` blockers at `_PyFrame_GetFrameObject()`, `_PyThreadState_BumpFramePointer()`, and `_PyFrame_GetGenerator()`. New exact first blocker is line 1185 (`error C2275: 'PyThread_type_lock' : illegal use of this type as an expression`) at `PyThread_type_lock lock1 = PyThread_allocate_lock();` in `threadstate_update_waiting_for_thread_shutdown()`, followed by the same function's `lock2` and `lock3` declaration-order fallout. |
| `git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch` against pristine `v3.11.16` tree | exit 0 |

**Caveat:** this is still compile-probe work only. No link, no `pythoncore`/`python.exe` build, no Wine launch, and no Windows 98 runtime execution was attempted or claimed.

## Files changed in previous revision (`pylifecycle.c` call_ll_exitfuncs C89 declaration-hoist slice)

All still uncommitted; nothing in this list has been pushed anywhere.

- `cpython/Python/pylifecycle.c` — hoists `call_ll_exitfuncs()`'s `void (*exitfunc)(void)` declaration before the loop and assigns it at the original post-decrement point, preserving the decrement, slot clearing, LIFO invocation order, and final `stdout`/`stderr` flushes.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from `git -C cpython diff`; includes this slice plus earlier uncommitted compatibility edits. Reproducibility check: `git apply --check` against a pristine temporary `cpython/` worktree exited 0.
- `PORT_STATUS.md` — this revision.

**Command results (all reproduced in this revision):**

| Command | Result |
|---|---|
| `bash scripts/vc6-probe.test.sh` | exit 0, `ALL TESTS PASSED` — 6/6 checks `ok` |
| `bash scripts/vc6-probe-core.test.sh` | exit 0, `ALL TESTS PASSED` — 28/28 checks `ok`; `Modules/main.c` still compiles cleanly |
| `bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c` | exit 0 — gets past the prior line 3045 `void (*exitfunc)(void) = runtime->exitfuncs[runtime->nexitfuncs];` blocker in `call_ll_exitfuncs()`; no next `pylifecycle.c` blocker was found because the translation unit now compiles cleanly in the VC6 core compile probe. |
| `git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch` against pristine `v3.11.16` tree | exit 0 |

**Caveat:** this is still compile-probe work only. No link, no `pythoncore`/`python.exe` build, no Wine launch, and no Windows 98 runtime execution was attempted or claimed.

## Files changed in previous revision (`pylifecycle.c` fatal_error/_Py_FatalErrorFormat C89 declaration-hoist slice)

All still uncommitted; nothing in this list has been pushed anywhere.

- `cpython/Python/pylifecycle.c` — hoists `fatal_error()` locals (`runtime`, `tstate`, `interp`, `tss_tstate`, and `has_tstate_and_gil`) into the function declaration area while preserving the original assignment/evaluation points, including `runtime = &_PyRuntime`, `interp = NULL`, `tss_tstate = PyGILState_GetThisThreadState()`, and the `has_tstate_and_gil` boolean assignment. `_Py_FatalErrorFormat()` now declares `stream`, `fd`, and `vargs` before its reentrancy check, then assigns `stream = stderr` and `fd = fileno(stream)` at the original post-reentrancy point before output begins.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from `git -C cpython diff`; includes this slice plus earlier uncommitted compatibility edits. Reproducibility check: `git apply --check` against a pristine temporary `cpython/` worktree exited 0.
- `PORT_STATUS.md` — this revision.

**Command results (all reproduced in this revision):**

| Command | Result |
|---|---|
| `bash scripts/vc6-probe.test.sh` | exit 0, `ALL TESTS PASSED` — 6/6 checks `ok` |
| `bash scripts/vc6-probe-core.test.sh` | exit 0, `ALL TESTS PASSED` — 28/28 checks `ok`; `Modules/main.c` still compiles cleanly |
| `bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c` | exit 2 — gets past the prior line 2866 `_PyRuntimeState *runtime = &_PyRuntime;` blocker in `fatal_error()` plus the immediately adjacent `tstate`/`interp`/`tss_tstate`/`has_tstate_and_gil` declaration-order fallout and `_Py_FatalErrorFormat()`'s `FILE *stream`, `fd`, and `va_list vargs` mixed declarations. New exact first blocker is line 3045 (`error C2143: syntax error : missing ';' before 'type'`) at `void (*exitfunc)(void) = runtime->exitfuncs[runtime->nexitfuncs];` in `call_ll_exitfuncs()`. |
| `git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch` against pristine `v3.11.16` tree | exit 0 |

**Caveat:** this is still compile-probe work only. No link, no `pythoncore`/`python.exe` build, no Wine launch, and no Windows 98 runtime execution was attempted or claimed.

## Files changed in previous revision (`pylifecycle.c` fatal-error dump C89 declaration-hoist slice)

All still uncommitted; nothing in this list has been pushed anywhere.

- `cpython/Python/pylifecycle.c` — hoists `fatal_error_dump_runtime()`'s `PyThreadState *finalizing` to the function declaration area and assigns it at the original point after the `PUTS()` call. `_Py_DumpExtensionModules()` now declares its function-scope locals (`modules`, `pos`, `key`, `value`, `stdlib_module_names`, `header`, and `count`) before the `interp == NULL` early return; the `modules`, `stdlib_module_names`, `header`, and `count` initializers are preserved as assignments at their original execution points. The inner `is_stdlib_ext`, `i`, `item`, and `hash` block declarations are unchanged.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from `git -C cpython diff`; includes this slice plus earlier uncommitted compatibility edits. Reproducibility check: `git apply --check` against a pristine temporary `cpython/` tree exited 0.
- `PORT_STATUS.md` — this revision.

**Command results (all reproduced in this revision):**

| Command | Result |
|---|---|
| `bash scripts/vc6-probe.test.sh` | exit 0, `ALL TESTS PASSED` — 6/6 checks `ok` |
| `bash scripts/vc6-probe-core.test.sh` | exit 0, `ALL TESTS PASSED` — 28/28 checks `ok`; `Modules/main.c` still compiles cleanly |
| `bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c` | exit 2 — gets past the prior line 2698 `PyThreadState *finalizing = _PyRuntimeState_GetFinalizing(runtime);` blocker in `fatal_error_dump_runtime()` and the adjacent `_Py_DumpExtensionModules()` function-scope declaration-order blockers. New exact first blocker is line 2866 (`error C2275: '_PyRuntimeState' : illegal use of this type as an expression`) at `_PyRuntimeState *runtime = &_PyRuntime;` in `fatal_error()`, followed by additional `fatal_error()` declaration-order fallout. |
| `git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch` against pristine `v3.11.16` tree | exit 0 |

**Caveat:** this is still compile-probe work only. No link, no `pythoncore`/`python.exe` build, no Wine launch, and no Windows 98 runtime execution was attempted or claimed.

## Files changed in previous revision (`pylifecycle.c` is_valid_fd platform-branch C89 declaration-hoist slice)

All still uncommitted; nothing in this list has been pushed anywhere.

- `cpython/Python/pylifecycle.c` — hoists `is_valid_fd()`'s platform-branch locals into the function declaration area under the same preprocessor ladder: `int fd2` for the Linux `dup()` branch, `HANDLE hfile` for `MS_WINDOWS`, and `struct stat st` for the fallback branch. The existing `fd < 0` early return, platform conditions, and branch behavior are unchanged; the original declaration sites now only assign/use (`fd2 = dup(fd)`, `_get_osfhandle()`, and `fstat(fd, &st)`).
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from `git -C cpython diff`; includes this slice plus earlier uncommitted compatibility edits. Reproducibility check: `git apply --check` against a pristine temporary `cpython/` worktree exited 0.
- `PORT_STATUS.md` — this revision.

**Command results (all reproduced in this revision):**

| Command | Result |
|---|---|
| `bash scripts/vc6-probe.test.sh` | exit 0, `ALL TESTS PASSED` — 6/6 checks `ok` |
| `bash scripts/vc6-probe-core.test.sh` | exit 0, `ALL TESTS PASSED` — 28/28 checks `ok`; `Modules/main.c` still compiles cleanly |
| `bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c` | exit 2 — gets past the prior line 2296 `HANDLE hfile;` blocker in `is_valid_fd()`. New exact first blocker is line 2403 (`error C2275: 'PyObject' : illegal use of this type as an expression`) at `PyObject *encoding_str = PyUnicode_FromWideChar(encoding, -1);` in `create_stdio()`, followed by line 2409 `PyObject *errors_str = PyUnicode_FromWideChar(errors, -1);` and later declaration-order blockers. |

**Caveat:** this is still compile-probe work only. No link, no `pythoncore`/`python.exe` build, no Wine launch, and no Windows 98 runtime execution was attempted or claimed.

## Files changed in previous revision (`pylifecycle.c` add_main_module shadowed-loader C89 declaration-hoist slice)

All still uncommitted; nothing in this list has been pushed anywhere.

- `cpython/Python/pylifecycle.c` — hoists `PyObject *bimod` and a distinct `PyObject *loader_obj` into `add_main_module()`'s existing declaration group. The `builtins` import and `BuiltinImporter` lookup remain at their original execution points; the outer borrowed `loader` variable and its NULL/`Py_None` test are unchanged, while `loader_obj` carries only the formerly shadowed strong reference through its NULL check, `__loader__` dict set, and decref.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from `git -C cpython diff`; includes this slice plus earlier uncommitted compatibility edits. Reproducibility check: `git apply --check` against a pristine temporary `cpython/` worktree exited 0.
- `PORT_STATUS.md` — this revision.

**Command results (all reproduced in this revision):**

| Command | Result |
|---|---|
| `bash scripts/vc6-probe.test.sh` | exit 0, `ALL TESTS PASSED` — 6/6 checks `ok` |
| `bash scripts/vc6-probe-core.test.sh` | exit 0, `ALL TESTS PASSED` — 28/28 checks `ok`; `Modules/main.c` still compiles cleanly |
| `bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c` | exit 2 — gets past the prior line 2212 `PyObject *bimod = PyImport_ImportModule("builtins");` blocker and the same function's formerly shadowed line 2233 `PyObject *loader = PyObject_GetAttrString(...)` declaration-order blocker in `add_main_module()`. New exact first blocker is line 2296 (`error C2275: 'HANDLE' : illegal use of this type as an expression`) at `HANDLE hfile;` in `is_valid_fd()`, followed by later declaration-order blockers in `create_stdio()` and finalization diagnostics. |

**Caveat:** this is still compile-probe work only. No link, no `pythoncore`/`python.exe` build, no Wine launch, and no Windows 98 runtime execution was attempted or claimed.

## Files changed in previous revision (`pylifecycle.c` finalize_modules C89 declaration-hoist slice)

All still uncommitted; nothing in this list has been pushed anywhere.

- `cpython/Python/pylifecycle.c` — hoists `int verbose` and `PyObject *weaklist` to the top declaration group in `finalize_modules()`. `verbose` is assigned after the existing `modules == NULL` early return, and `weaklist` is assigned at the original `finalize_remove_modules(modules, verbose)` call site, preserving early-return behavior and call order.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from `git -C cpython diff`; includes this slice plus earlier uncommitted compatibility edits. Reproducibility check: `git apply --check` against a pristine temporary `cpython/` worktree exited 0.
- `PORT_STATUS.md` — this revision.

**Command results (all reproduced in this revision):**

| Command | Result |
|---|---|
| `bash scripts/vc6-probe.test.sh` | exit 0, `ALL TESTS PASSED` — 6/6 checks `ok` |
| `bash scripts/vc6-probe-core.test.sh` | exit 0, `ALL TESTS PASSED` — 28/28 checks `ok`; `Modules/main.c` still compiles cleanly |
| `bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c` | exit 2 — gets past the prior line 1606 `int verbose = _PyInterpreterState_GetConfig(interp)->verbose;` blocker and line 1624 `PyObject *weaklist = finalize_remove_modules(modules, verbose);` in `finalize_modules()`. New exact first blocker is line 1838 (`error C2275: 'PyThreadState' : illegal use of this type as an expression`) at `PyThreadState *tstate = _PyRuntimeState_GetThreadState(runtime);` in `Py_FinalizeEx()`, followed by line 1868 `int malloc_stats = tstate->interp->config.malloc_stats;` and later finalization declaration-order blockers. |

**Caveat:** this is still compile-probe work only. No link, no `pythoncore`/`python.exe` build, no Wine launch, and no Windows 98 runtime execution was attempted or claimed.

## Files changed in previous revision (`pylifecycle.c` finalize_modules_clear_weaklist C89 declaration-hoist slice)

All still uncommitted; nothing in this list has been pushed anywhere.

- `cpython/Python/pylifecycle.c` — hoists `Py_ssize_t i` plus `PyObject *tup`, `name`, `mod`, and `dict` to the top declaration group in `finalize_modules_clear_weaklist()`. The reverse loop now assigns `i = PyList_GET_SIZE(weaklist) - 1` at the original loop point, and each former loop-local declaration is now an assignment at the same position, preserving evaluation order and the two existing `continue` paths.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from `git -C cpython diff`; includes this slice plus earlier uncommitted compatibility edits. Reproducibility check: `git apply --check` against a pristine temporary `cpython/` worktree exited 0.
- `PORT_STATUS.md` — this revision.

**Command results (all reproduced in this revision):**

| Command | Result |
|---|---|
| `bash scripts/vc6-probe.test.sh` | exit 0, `ALL TESTS PASSED` — 6/6 checks `ok` |
| `bash scripts/vc6-probe-core.test.sh` | exit 0, `ALL TESTS PASSED` — 28/28 checks `ok`; `Modules/main.c` still compiles cleanly |
| `bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c` | exit 2 — gets past the prior line 1551 `for (Py_ssize_t i = PyList_GET_SIZE(weaklist) - 1; i >= 0; i--)` blocker and the same loop's `PyObject *tup`, `name`, `mod`, and `dict` mixed declarations. New exact first blocker is line 1606 (`error C2143: syntax error : missing ';' before 'type'`) at `int verbose = _PyInterpreterState_GetConfig(interp)->verbose;` in `finalize_modules()`, followed by line 1624 `PyObject *weaklist = finalize_remove_modules(modules, verbose);` and later finalization declaration-order blockers. |

**Caveat:** this is still compile-probe work only. No link, no `pythoncore`/`python.exe` build, no Wine launch, and no Windows 98 runtime execution was attempted or claimed.

## Files changed in previous revision (`pylifecycle.c` finalize_modules_delete_special C89 declaration-hoist slice)

All still uncommitted; nothing in this list has been pushed anywhere.

- `cpython/Python/pylifecycle.c` — hoists `const char * const *p` and `PyObject *value` to the top declaration group in `finalize_modules_delete_special()`. The first loop now assigns `p = sys_deletes` at the original declaration point, and the second loop assigns `value = _PyDict_GetItemStringWithError(...)` where the mixed declaration used to be. `name` and `orig_name` remain loop-local, preserving their evaluation/order.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from `git -C cpython diff`; includes this slice plus earlier uncommitted compatibility edits. Reproducibility check: `git apply --check` against a pristine temporary `cpython/` worktree exited 0.
- `PORT_STATUS.md` — this revision.

**Command results (all reproduced in this revision):**

| Command | Result |
|---|---|
| `bash scripts/vc6-probe.test.sh` | exit 0, `ALL TESTS PASSED` — 6/6 checks `ok` |
| `bash scripts/vc6-probe-core.test.sh` | exit 0, `ALL TESTS PASSED` — 28/28 checks `ok`; `Modules/main.c` still compiles cleanly |
| `bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c` | exit 2 — gets past the prior line 1411 `const char * const *p;` blocker and the line 1426 `PyObject *value` blocker in `finalize_modules_delete_special()`. New exact first blocker is line 1551 (`error C2143: syntax error : missing ';' before 'type'`) at `for (Py_ssize_t i = PyList_GET_SIZE(weaklist) - 1; i >= 0; i--)` in `finalize_modules_clear_weaklist()`, followed by `PyObject *tup`, `PyObject *name`, `PyObject *mod`, and `PyObject *dict` mixed declarations in the same loop/function plus later finalization blockers. |

**Caveat:** this is still compile-probe work only. No link, no `pythoncore`/`python.exe` build, no Wine launch, and no Windows 98 runtime execution was attempted or claimed.

## Files changed in previous revision (`pylifecycle.c` pyinit_main/public initialization API C89 declaration-hoist slice)

All still uncommitted; nothing in this list has been pushed anywhere.

- `cpython/Python/pylifecycle.c` — hoists declaration-order blockers in `pyinit_main()`, `Py_InitializeFromConfig()`, `Py_InitializeEx()`, and `_Py_InitializeMain()`. Locals are declared at function top, while assignments/calls (`tstate->interp`, `_PyRuntime_Initialize()`, `&_PyRuntime`, `tstate = NULL`, `_PyConfig_InitCompatConfig()`, and `_PyRuntimeState_GetThreadState(runtime)`) remain at their original execution points to preserve behavior.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from `git -C cpython diff`; includes this slice plus earlier uncommitted compatibility edits. Reproducibility check: `git apply --check` against a pristine temporary `cpython/` worktree exited 0.
- `PORT_STATUS.md` — this revision.

**Command results (all reproduced in this revision):**

| Command | Result |
|---|---|
| `bash scripts/vc6-probe.test.sh` | exit 0, `ALL TESTS PASSED` — 6/6 checks `ok` |
| `bash scripts/vc6-probe-core.test.sh` | exit 0, `ALL TESTS PASSED` — 28/28 checks `ok`; `Modules/main.c` still compiles cleanly |
| `bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c` | exit 2 — gets past the prior line 1285 `PyStatus status = init_interp_main(tstate);` blocker in `pyinit_main()` and the declaration-order fallout in `Py_InitializeFromConfig()`, `Py_InitializeEx()`, and `_Py_InitializeMain()`. New exact first blocker is line 1411 (`error C2143: syntax error : missing ';' before 'const'`) at `const char * const *p;` in `finalize_modules_delete_special()`, followed by `PyObject *value` in the same function and later finalization mixed-declaration blockers. |

**Caveat:** this is still compile-probe work only. No link, no `pythoncore`/`python.exe` build, no Wine launch, and no Windows 98 runtime execution was attempted or claimed.

## Files changed in previous revision (`pylifecycle.c` pyinit_core/init_interp_main C89 declaration-hoist slice)

All still uncommitted; nothing in this list has been pushed anywhere.

- `cpython/Python/pylifecycle.c` — hoists `PyConfig config` to the top of `pyinit_core()` while leaving `PyConfig_InitPythonConfig(&config)` at its original execution point. `init_interp_main()` now declares `PyStatus status`, then initialized `is_main_interp`, `interp`, and `config` at function top before the existing `assert`, preserving the declaration initializer order requested for this narrow VC6 declaration-order slice.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from `git -C cpython diff`; includes this slice plus earlier uncommitted compatibility edits. Reproducibility check: `git apply --check` against a pristine temporary `cpython/` worktree exited 0.
- `PORT_STATUS.md` — this revision.

**Command results (all reproduced in this revision):**

| Command | Result |
|---|---|
| `bash scripts/vc6-probe.test.sh` | exit 0, `ALL TESTS PASSED` — 6/6 checks `ok` |
| `bash scripts/vc6-probe-core.test.sh` | exit 0, `ALL TESTS PASSED` — 28/28 checks `ok`; `Modules/main.c` still compiles cleanly |
| `bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c` | exit 2 — gets past the prior line 1104 `PyConfig config;` blocker in `pyinit_core()` and the immediately exposed `init_interp_main()` mixed declarations. New exact first blocker is line 1285 (`error C2275: 'PyStatus' : illegal use of this type as an expression`) at the mixed declaration `PyStatus status = init_interp_main(tstate);` in `pyinit_main()`, followed by additional declaration-order fallout in `Py_InitializeFromConfig()` and later functions. |

**Caveat:** this is still compile-probe work only. No link, no `pythoncore`/`python.exe` build, no Wine launch, and no Windows 98 runtime execution was attempted or claimed.

## Files changed in previous revision (`pylifecycle.c` pre-initialization C89/C99 slice)

All still uncommitted; nothing in this list has been pushed anywhere.

- `cpython/Python/pylifecycle.c` — removes the two pre-initialization `_PyArgv` designated initializers in `Py_PreInitializeFromBytesArgs()` and `Py_PreInitializeFromArgs()` by declaring `args` first and assigning `use_bytes_argv`, `argc`, and the active argv pointer field explicitly before the existing `_Py_PreInitializeFromPyArgv()` call. `_Py_PreInitializeFromConfig()` now declares `PyStatus status`, `_PyRuntimeState *runtime`, `PyPreConfig preconfig`, and `_PyArgv config_args` at function top, assigns `status`/`runtime` at their original execution points, and replaces the `args == NULL` branch's designated `config_args` initializer with field-by-field assignments immediately before the existing call. Evaluation and call order are unchanged.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from `git -C cpython diff`; includes this slice plus earlier uncommitted compatibility edits. Reproducibility check: `git apply --check` against a pristine temporary `cpython/` worktree exited 0.
- `PORT_STATUS.md` — this revision.

**Command results (all reproduced in this revision):**

| Command | Result |
|---|---|
| `bash scripts/vc6-probe.test.sh` | exit 0, `ALL TESTS PASSED` — 6/6 checks `ok` |
| `bash scripts/vc6-probe-core.test.sh` | exit 0, `ALL TESTS PASSED` — 28/28 checks `ok`; `Modules/main.c` still compiles cleanly |
| `bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c` | exit 2 — gets past the prior line 1008 and 1016 `_PyArgv args = { .use_bytes_argv = ... }` designated initializers, plus the mixed declarations and designated `config_args` initializer inside `_Py_PreInitializeFromConfig()`. New exact first blocker is line 1104 (`error C2275: 'PyConfig' : illegal use of this type as an expression`) at the mixed declaration `PyConfig config;` in `pyinit_core()`, followed by nearby `pyinit_main()` declaration-order blockers and later C89/C99 fallout. |

**Caveat:** this is still compile-probe work only. No link, no `pythoncore`/`python.exe` build, no Wine launch, and no Windows 98 runtime execution was attempted or claimed.

## Files changed in previous revision (`pylifecycle.c` builtins C89 declaration-hoist slice)

All still uncommitted; nothing in this list has been pushed anywhere.

- `cpython/Python/pylifecycle.c` — hoists the remaining VC6-rejected `PyObject *` declarations in `pycore_init_builtins()` (`bimod`, `builtins_dict`, `isinstance`, `len`, `list_append`, and `import_func`) to the function top, then assigns each at its original execution site. Evaluation order and existing error paths are unchanged; each local is still assigned before use.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from `git -C cpython diff`; includes this slice plus earlier uncommitted compatibility edits. Reproducibility check: `git apply --check` against a pristine temporary `cpython/` worktree exited 0.
- `PORT_STATUS.md` — this revision.

**Command results (all reproduced in this revision):**

| Command | Result |
|---|---|
| `bash scripts/vc6-probe.test.sh` | exit 0, `ALL TESTS PASSED` — 6/6 checks `ok` |
| `bash scripts/vc6-probe-core.test.sh` | exit 0, `ALL TESTS PASSED` — 28/28 checks `ok`; `Modules/main.c` still compiles cleanly |
| `bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c` | exit 2 — gets past all mixed declarations in `pycore_init_builtins()`. New exact first blocker is line 912 (`error C2143: syntax error : missing ';' before 'const'`) at the mixed declaration `const PyConfig *config = _PyInterpreterState_GetConfig(interp);` in `pycore_interp_init()`, followed by the undeclared `config` fallout and later C89/C99 blockers. |

**Caveat:** this is still compile-probe work only. No link, no `pythoncore`/`python.exe` build, no Wine launch, and no Windows 98 runtime execution was attempted or claimed.

## Files changed in previous revision (`pylifecycle.c` create-interpreter C89 declaration-hoist slice)

All still uncommitted; nothing in this list has been pushed anywhere.

- `cpython/Python/pylifecycle.c` — hoists only the two next VC6-rejected declarations in `pycore_create_interpreter()`: `PyInterpreterState *interp` and `PyThreadState *tstate` are now declared at function top, while `_PyGILState_Init(runtime)`, `PyInterpreterState_New()`, and `PyThreadState_New(interp)` still execute at their original call sites and in the same order.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from `git -C cpython diff`; includes this slice plus earlier uncommitted compatibility edits. Reproducibility check: `git apply --check` against a pristine temporary `cpython/` worktree exited 0.
- `PORT_STATUS.md` — this revision.

**Command results (all reproduced in this revision):**

| Command | Result |
|---|---|
| `bash scripts/vc6-probe.test.sh` | exit 0, `ALL TESTS PASSED` — 6/6 checks `ok` |
| `bash scripts/vc6-probe-core.test.sh` | exit 0, `ALL TESTS PASSED` — 28/28 checks `ok`; `Modules/main.c` still compiles cleanly |
| `bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c` | exit 2 — gets past the prior line 682 `pycore_create_interpreter()` `PyInterpreterState *interp` mixed declaration and line 693 `PyThreadState *tstate` mixed declaration. New exact first blocker is line 812 (`error C2275: 'PyObject' : illegal use of this type as an expression`) at the mixed declaration `PyObject *builtins_dict = PyEval_GetBuiltins();` in `pycore_init_builtins()`, followed by the same function's line 819 `PyObject *isinstance = PyDict_GetItem(...)` and additional C89 mixed-declaration blockers. |

**Caveat:** this is still compile-probe work only. No link, no `pythoncore`/`python.exe` build, no Wine launch, and no Windows 98 runtime execution was attempted or claimed.

## Files changed in previous revision (`pylifecycle.c` interpreter-config C89 declaration-hoist slice)

All still uncommitted; nothing in this list has been pushed anywhere.

- `cpython/Python/pylifecycle.c` — hoists only the interpreter-configuration `PyStatus` locals that VC6 rejected as mixed declarations: `interpreter_update_config()` now declares one `PyStatus status` at function top and assigns it at the two original call sites, and `_PyInterpreterState_SetConfig()` declares `PyConfig config` / `PyStatus status` before calling `PyConfig_InitPythonConfig()`. Assignment/evaluation order is unchanged and the former inner `status` shadowing is removed.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from `git -C cpython diff`; includes this slice plus earlier uncommitted compatibility edits. Reproducibility check: `git apply --check` against a pristine temporary `cpython/` worktree exited 0.
- `PORT_STATUS.md` — this revision.

**Command results (all reproduced in this revision):**

| Command | Result |
|---|---|
| `bash scripts/vc6-probe.test.sh` | exit 0, `ALL TESTS PASSED` — 6/6 checks `ok` |
| `bash scripts/vc6-probe-core.test.sh` | exit 0, `ALL TESTS PASSED` — 28/28 checks `ok`; `Modules/main.c` still compiles cleanly |
| `bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c` | exit 2 — gets past the prior line 528 `_PyInterpreterState_SetConfig()` mixed-declaration blocker and the nearby line 505 `interpreter_update_config()` `PyStatus` shadow declaration. New exact first blocker is line 580 (`error C2275: 'PyInterpreterState' : illegal use of this type as an expression`) at the mixed declaration `PyInterpreterState *interp = tstate->interp;` in `pyinit_core_reconfigure()`, followed by additional C89 mixed-declaration blockers including line 614 `PyStatus status = _PyConfig_Write(config, runtime);` in `pycore_init_runtime()`. |

**Caveat:** this is still compile-probe work only. No link, no `pythoncore`/`python.exe` build, no Wine launch, and no Windows 98 runtime execution was attempted or claimed.

## Files changed in previous revision (`_PyStatus_OK()` recursion fix and `_PyStatus_ERR()` VC6 helper slice)

All still uncommitted; nothing in this list has been pushed anywhere.

- `cpython/Include/internal/pycore_initconfig.h` — replaces the VC6-only `_PyStatus_OK()` mapping to `PyStatus_Ok()` with a local static C89 helper that assigns all `PyStatus` fields explicitly, avoiding the `PyStatus_Ok() -> _PyStatus_OK() -> PyStatus_Ok()` recursion. Adds a VC6-only `_PyStatus_ERR()` helper that assigns `_type = _PyStatus_TYPE_ERROR`, `func = NULL` (matching public `PyStatus_Error()` semantics because VC6 has neither `__func__` nor `__FUNCTION__`), `err_msg`, and `exitcode = 0`. Non-VC6 compound-literal macros are unchanged.
- `scripts/fixtures/vc6_compound_literal_smoke.c` — now exercises both `_PyStatus_OK()` and `_PyStatus_ERR()` through the real internal header.
- `scripts/vc6-probe-core.test.sh` — adds a focused regression check that `_PyStatus_OK()` no longer maps to `PyStatus_Ok()`, and updates the compound-literal smoke-test description.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from `git -C cpython diff`; includes this slice plus earlier uncommitted compatibility edits. Reproducibility check: `git apply --check` against a pristine temporary `cpython/` worktree exited 0.
- `PORT_STATUS.md` — this revision.

**Command results (all reproduced in this revision):**

| Command | Result |
|---|---|
| `bash scripts/vc6-probe-core.sh scripts/fixtures/vc6_compound_literal_smoke.c` | exit 0 — focused smoke fixture compiles while calling both `_PyStatus_OK()` and `_PyStatus_ERR()` directly under VC6. |
| `bash scripts/vc6-probe.test.sh` | exit 0, `ALL TESTS PASSED` — 6/6 checks `ok` |
| `bash scripts/vc6-probe-core.test.sh` | exit 0, `ALL TESTS PASSED` — 28/28 checks `ok`; `Modules/main.c` still compiles cleanly |
| `bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c` | exit 2 — gets past the prior line 259 `_PyStatus_ERR("external importer setup failed")` compound-literal blocker. New exact first blocker is line 528 (`error C2275: 'PyStatus' : illegal use of this type as an expression`) at the mixed declaration `PyStatus status = _PyConfig_Copy(&config, src_config);` in `_PyInterpreterState_SetConfig()`, followed by additional C89 mixed-declaration blockers. |

**Caveat:** this is still compile-probe work only. No link, no `pythoncore`/`python.exe` build, no Wine launch, and no Windows 98 runtime execution was attempted or claimed.

## Files changed in previous revision (`init_importlib()` C89 declaration-hoist slice)

All still uncommitted; nothing in this list has been pushed anywhere.

- `cpython/Python/pylifecycle.c` — hoists only the existing `init_importlib()` local declarations (`interp`, `verbose`, `importlib`, `imp_mod`, `value`) to the top of the function, then preserves the prior assignment/evaluation order after the existing assertion and at each original use site.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from `git -C cpython diff`; includes this slice plus earlier uncommitted compatibility edits. Reproducibility check: `git apply --check` against a pristine temporary `cpython/` worktree exited 0.
- `PORT_STATUS.md` — this revision.

**Command results (all reproduced in this revision):**

| Command | Result |
|---|---|
| `bash scripts/vc6-probe.test.sh` | exit 0, `ALL TESTS PASSED` — 6/6 checks `ok` |
| `bash scripts/vc6-probe-core.test.sh` | exit 0, `ALL TESTS PASSED` — 27/27 checks `ok`; `Modules/main.c` still compiles cleanly |
| `bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c` | exit 2 — gets past the prior line 202 `init_importlib()` mixed-declaration blocker. New exact first blocker is line 259 (`error C2059: syntax error : '{'`) at `_PyStatus_ERR("external importer setup failed")` in `init_importlib_external()`, followed by further `PyStatus` compound-literal/designated-initializer and C89 mixed-declaration blockers. |

**Caveat:** this is still compile-probe work only. No link, no `pythoncore`/`python.exe` build, no Wine launch, and no Windows 98 runtime execution was attempted or claimed.

## Files changed in previous revision (`_PyStatus_OK()` VC6 macro fallback slice)

All still uncommitted; nothing in this list has been pushed anywhere.

- `cpython/Include/internal/pycore_initconfig.h` — keeps the existing C99 compound-literal `_PyStatus_OK()` macro for non-VC6 compilers, but maps `_PyStatus_OK()` to the existing public `PyStatus_Ok()` API only for `_MSC_VER < 1300` so VC6 no longer has to parse `(PyStatus){._type = ...}` at `_PyRuntime_Initialize()`.
- `scripts/fixtures/vc6_compound_literal_smoke.c` — now exercises `_PyStatus_OK()` itself, verifying the VC6-only macro fallback rather than bypassing it by calling `PyStatus_Ok()` directly.
- `scripts/vc6-probe-core.test.sh` — updates the focused compound-literal smoke-test description for the shared macro fallback.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from `git -C cpython diff`; includes this slice plus earlier uncommitted compatibility edits. Reproducibility check: `git apply --check` against a pristine temporary `cpython/` copy exited 0.
- `PORT_STATUS.md` — this revision.

**Command results (all reproduced in this revision):**

| Command | Result |
|---|---|
| `bash scripts/vc6-probe-core.sh scripts/fixtures/vc6_compound_literal_smoke.c` | exit 0 — focused smoke fixture now compiles while calling `_PyStatus_OK()` directly under VC6. |
| `bash scripts/vc6-probe.test.sh` | exit 0, `ALL TESTS PASSED` — 6/6 checks `ok` |
| `bash scripts/vc6-probe-core.test.sh` | exit 0, `ALL TESTS PASSED` — 27/27 checks `ok`; `Modules/main.c` still compiles cleanly |
| `bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c` | exit 2 — gets past the prior line 143 `_PyStatus_OK()` compound-literal blocker. New exact first blocker is line 202 (`error C2143: syntax error : missing ';' before 'type'`), the existing C89 mixed-declaration wall in `init_importlib()`, followed by further declaration-order and remaining non-OK compound-literal/designated-initializer blockers. |

**Caveat:** this is still compile-probe work only. No link, no `pythoncore`/`python.exe` build, no Wine launch, and no Windows 98 runtime execution was attempted or claimed.

## Files changed in previous revision (`_PyRuntimeState_INIT` VC6 replacement slice)

All still uncommitted; nothing in this list has been pushed anywhere.

- `cpython/Include/internal/pycore_runtime_init.h` — keeps the existing C99 designated initializer path for non-VC6 compilers, but exposes `_PyRuntimeState_InitStaticDefaults()` for VC6 instead of making VC6 parse `_PyRuntimeState_INIT`.
- `cpython/Python/pylifecycle.c` — leaves `_PyRuntime` zero-initialized only for VC6, then calls the shared explicit defaults routine once before `_PyRuntimeState_Init()`. Non-VC6 still uses `= _PyRuntimeState_INIT`.
- `cpython/Python/pystate.c` — adds the VC6 field-by-field default routine used by both the process-global runtime and later runtime/interpreter/thread resets. It explicitly preserves the required defaults: `gilstate.check_enabled = 1`, zeroed `Py_tss_NEEDS_INIT` storage, `interpreters.next_id = -1`, global small ints/bytes/strings/empty tuple, `_main_interpreter` (`_static`, `id_refcount`, recursion/gc thresholds), and `_initial_thread` (`_static`, recursion limit, `context_ver = 1`). Non-VC6 still uses the upstream `static const initial = _PyRuntimeState_INIT`/`memcpy` path.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated from `git -C cpython diff`; includes this slice plus earlier uncommitted compatibility edits.
- `PORT_STATUS.md` — this revision.

**Command results (all reproduced in this revision):**

| Command | Result |
|---|---|
| `bash scripts/vc6-probe.test.sh` | exit 0, `ALL TESTS PASSED` — 6/6 checks `ok` |
| `bash scripts/vc6-probe-core.test.sh` | exit 0, `ALL TESTS PASSED` — 27/27 checks `ok`; `Modules/main.c` still compiles cleanly |
| `bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c` | exit 2 — the `_PyRuntime` definition no longer fails at `_PyRuntimeState_INIT` line 112. New first error is line 143 (`_PyStatus_OK()` compound literal), followed by existing C89 declaration-order and C99 initializer blockers in the rest of the file. |
| `bash scripts/vc6-probe-core.sh cpython/Python/pystate.c` | exit 2 — the former `static const _PyRuntimeState initial = _PyRuntimeState_INIT` C2059 errors are gone and later `initial._main_interpreter` reset users are covered by the same VC6 defaults helpers. Current first errors are pre-existing C89 declaration-order issues in `pycore_frame.h` and then in `pystate.c`; no remaining `_PyRuntimeState_INIT` parse error is reported before the 100-error cap. |

**Caveat:** this is still compile-probe work only. No link, no `pythoncore`/`python.exe` build, no Wine launch, and no Windows 98 runtime execution was attempted or claimed.

## Files changed in this revision (`pylifecycle.c` VC6 PyRuntime section slice)

All still uncommitted; nothing in this list has been pushed anywhere.

- `cpython/Python/pylifecycle.c` — narrow VC6-only compatibility edit for
  the first `Python/pylifecycle.c` blocker: keep the modern Windows
  `#pragma section("PyRuntime", read, write)` +
  `__declspec(allocate("PyRuntime"))` path unchanged for non-VC6 compilers,
  but use VC6's supported `#pragma data_seg("PyRuntime")` /
  `#pragma data_seg()` spelling around the initialized `_PyRuntime` object
  when `_MSC_VER < 1300`. The `_PyRuntimeState_INIT` initializer remains
  exactly at the definition site.
- `compat/msvc600/cpython-3.11.16-vc6-headers.patch` — regenerated in full
  from `git -C cpython diff`; now 767 lines and includes the
  `Python/pylifecycle.c` hunk alongside previous uncommitted compatibility
  edits.
- `PORT_STATUS.md` — this revision.

**Command results (all reproduced in this revision):**

| Command | Result |
|---|---|
| `bash scripts/vc6-probe.test.sh` | exit 0, `ALL TESTS PASSED` — 6/6 checks `ok` |
| `bash scripts/vc6-probe-core.test.sh` | exit 0, `ALL TESTS PASSED` — 27/27 checks `ok`; includes `Modules/main.c` compile-only clean check |
| `bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c` | exit 2 — gets past the prior VC6-incompatible `PyRuntime` section pragma/declaration pair; no `unknown pragma` warning and no `C2341` segment error remain. New first blocker is `cpython\Python\pylifecycle.c(112) : error C2059: syntax error : '.'` in `_PyRuntimeState_INIT`, followed by more C99 compound-literal/designated-initializer and C89 mixed-declaration errors; the run later hits `fatal error C1003` at line 1232. |

**Caveat:** all probe results here are compile-only (`/c`) results. No link,
no `pythoncore`/`python.exe` build, no Wine launch, and no Windows 98 runtime
execution was attempted or claimed.

## Verified

- CPython source checkout is at the requested `v3.11.16` baseline.
- The MSVC600 tool bundle is present locally and its `VC98/bin/VCVARS32.BAT`
  environment script runs under Wine.
- MSVC6 reports:

  ```text
  Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86
  ```

- A direct compile probe reaches CPython 3.11 headers. The first unmodified
  probe fails before linking, proving the compiler is being invoked against the
  intended baseline.
- Project-local compatibility headers have been added under
  `compat/msvc600/`: `inttypes.h` (first isolated shim) and, as of this
  revision, `stdbool.h` (see "stdbool slice" below). Neither is declared
  sufficient for the port on its own.
- **`scripts/vc6-probe.sh` was fixed and is now truthful.** The script piped
  `cl.exe` output through `grep`/`sed` to drop Wine's `:err:` debug noise and
  to shorten absolute host paths to repo-relative ones. The path-shortening
  step was silently broken: it built a `sed` pattern directly from a
  Windows-style path (e.g. `Z:\home\ubuntu\...\`), and both `sed` BRE and bash
  glob patterns treat a bare `\` in a *pattern* as an escape character, so
  `\h`, `\u`, `\p`, etc. were consumed as (mostly no-op) escapes instead of
  literal characters and the substitution never matched anything — diagnostics
  always showed full absolute Wine paths instead of the intended
  repo-relative ones. Fixed by matching the prefix as a literal string via a
  quoted bash `${line//"$prefix"/}` expansion (quoting forces literal, not
  glob, matching) instead of an unescaped regex. The pipeline's exit-status
  capture via `PIPESTATUS[0]` was already correct (verified with a
  deliberately broken translation unit: `cl.exe`'s real nonzero exit code
  propagated correctly both before and after this fix); it is now covered by
  a regression test so it cannot regress silently.
  A new regression test, `scripts/vc6-probe.test.sh`, exercises both the
  path-stripping helper directly and — when wine + MSVC600 are available, as
  they are in this environment — the real script against a deliberately
  invalid `.c` file, asserting a nonzero exit code, a surfaced `error C`
  diagnostic, and no leaked absolute Wine path. Run: `bash
  scripts/vc6-probe.test.sh`. Last run: all 6 checks `ok`.
- **`Include/internal/pycore_atomic.h`'s VC6/`intrin.h` blocker is now
  resolved for 32-bit x86 (`_M_IX86`) and verified; see "Atomics slice"
  below for full detail and honesty notes on what is and is not covered.
- **`Include/internal/pycore_interp.h`'s VC6/`<stdbool.h>` blocker is now
  resolved and verified; see "stdbool slice" below for full detail.
- **The VC6 C89-vs-C99 mixed-declarations blocker in four
  `Include/internal/pycore_*.h` headers (`pycore_code.h`, `pycore_dict.h`,
  `pycore_list.h`, `pycore_call.h`) reachable from `Modules/main.c` is now
  resolved and verified; see "Mixed-declarations header slice" below for
  full detail.
- **The same C89-vs-C99 mixed-declarations pattern, pervasive within
  `Modules/main.c`'s own body (29 error sites across roughly a dozen
  functions), is now also resolved and verified; see "Modules/main.c
  declaration-order slice" below for full detail.** With that fix applied,
  `Modules/main.c` hits a new, unrelated, and out-of-scope-for-that-slice
  blocker: several C99 compound-literal/designated-initializer macros
  (`_PyStatus_OK()`, `_PyCompilerFlags_INIT`, and the `_PyArgv`-style struct
  literals in `Py_Main()`/`Py_BytesMain()`) that VC6 does not support at
  all, independent of declaration position.
- **That compound-literal/designated-initializer blocker is now also
  resolved and verified for all 8 sites in `Modules/main.c`; see
  "Compound-literal / designated-initializer slice" below for full
  detail.** With that fix applied, `cpython/Modules/main.c` compiles with
  `cl.exe` exit status 0 under `scripts/vc6-probe-core.sh` — no errors, no
  warnings. **This is a compile-only (`/c`) result for one translation
  unit; it is not a link, not a `pythoncore`/`python.exe` build, and not a
  runtime claim** (`vc6-probe-core.sh` never attempts to link). Probing
  the next core translation unit in `Modules/main.c`'s own call chain,
  `Python/pylifecycle.c`, hits the same two already-solved blocker classes
  again (recurring, not novel) plus enough additional errors to exceed
  the compiler's 100-error cap before the whole file is even seen; see
  "Next blocker: `Python/pylifecycle.c`" below. No link or runtime success
  is claimed anywhere in this document.

## `pycore_object.h` VC6 `__func__` / GC helper declaration-order slice

**Scope: one internal header only, as requested.** The real
`Python/pylifecycle.c` core probe previously stopped first in
`Include/internal/pycore_object.h`: VC6 reported `__func__` undeclared at
the `_PyObject_ASSERT_FROM(..., __func__)` calls in `_PyObject_GC_TRACK()`,
then cascaded into C89 mixed-declaration errors for the local `PyGC_Head *`
and `PyInterpreterState *` declarations in `_PyObject_GC_TRACK()` and
`_PyObject_GC_UNTRACK()`.

The header now has a VC6-only fallback:

```c
#if defined(_MSC_VER) && _MSC_VER < 1300 && !defined(__func__)
#  define __func__ "<unknown>"
#endif
```

A quick VC6 smoke probe showed `__FUNCTION__` is also unavailable in VC6, so
there was no exact function-name extension to preserve. This mapping only
degrades debug/fatal diagnostic function-name text on VC6; C99 compilers and
newer MSVC keep their normal behavior. The only declaration-order edits are
the mechanical C89 transform in `_PyObject_GC_TRACK()` and
`_PyObject_GC_UNTRACK()`: declarations at block start, assignments left at
the original evaluation points.

Verification: `bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c`
now gets past `pycore_object.h`; the new first blocker is the Windows
section-allocation pragma pair in `Python/pylifecycle.c` (see "Next
blocker" below).

## Atomics slice (`pycore_atomic.h`, VC6 / `_M_IX86`)

**Scope: 32-bit x86 only, matching this port's only target (Windows 9x has
no x64 edition).** `Include/internal/pycore_atomic.h` previously included
`<intrin.h>` and used `_Interlocked*` compiler intrinsics unconditionally
for any `_MSC_VER`-defined compiler; VC6 (`_MSC_VER` 1200) has neither. The
now-applied, still-uncommitted `compat/msvc600/cpython-3.11.16-vc6-headers.patch`
adds two things to this header, both gated strictly to
`defined(_MSC_VER) && _MSC_VER < 1300 && defined(_M_IX86)` (a new
`_Py_ATOMIC_VC6_X86` macro) so every other compiler/version — including
modern MSVC on `_M_X64`/ARM and the GCC/clang/C11 paths — keeps its exact
prior behavior, byte-for-byte (verified: `git diff` on the non-VC6 branches
shows only their line numbers moving under the new `#elif`, no content
changes):

1. The top-of-file `<intrin.h>`/`<immintrin.h>` include is skipped for
   VC6/`_M_IX86`; `<windows.h>` is included instead, to declare
   `InterlockedExchange`/`InterlockedCompareExchange`.
2. A new `#if defined(_Py_ATOMIC_VC6_X86)` branch (ahead of the existing
   `_M_IX86 || _M_X64` branch, now `#elif`) implements
   `_Py_atomic_store_explicit`/`_Py_atomic_load_explicit` for
   `_Py_atomic_int`/`_Py_atomic_address` using the Win32
   `InterlockedExchange`/`InterlockedCompareExchange` API — present in
   `KERNEL32.DLL` since Windows 98 (confirmed against this project's actual
   MSVC600 VC98 SDK headers, `MSVC600/VC98/Include/WINBASE.H`, which declare
   both for `_M_IX86` outside the MRx000/Alpha-only intrinsic path). Both
   give a full memory barrier on x86, same as the intrinsics they replace,
   so — as the original comment already notes for the HLE-unavailable case
   — every `_Py_memory_order` maps to the same fully-fenced operation; VC6
   has no HLE (`_HLEAcquire`/`_HLERelease`, VS2013+) intrinsics or hardware
   support to preserve here regardless.

**64-bit atomics are explicitly NOT implemented, and this is not a gap in
practice for this port.** `_Py_atomic_address` (`uintptr_t`) and
`_Py_atomic_int` (`int`) are both 4 bytes on 32-bit x86, so the existing
`sizeof(...) == 8` branches that select the 64-bit store/load paths in the
pre-existing `_M_IX86 || _M_X64` code are already unreachable dead code on
`_M_IX86` upstream, before this patch — VC6 never defines `_M_X64`. The VC6
branch added here therefore has no 64-bit path to implement, and a
`#error` guards the (unreachable-under-VC6) case where `_M_X64` were ever
also defined, so a future misconfiguration fails loudly at compile time
instead of silently truncating a 64-bit atomic. No `CMPXCHG8B` inline
assembly was written, and none is required for this header; if some other
part of the port needs genuine 64-bit interlocked ops on VC6 later, that is
a separate, not-yet-encountered problem, not something papered over here.

**Verified with two independent probes**, both under
`scripts/vc6-probe-core.sh` (new; extends `scripts/vc6-probe.sh`'s approach
to `Py_BUILD_CORE` translation units — `/D Py_BUILD_CORE` plus
`Include/internal` on the include path):

- `scripts/fixtures/vc6_atomic_smoke.c` (new) — a minimal, isolated
  translation unit that includes only `pycore_atomic.h` (via `<inttypes.h>`
  for `uintptr_t`, which real callers get from `Python.h`/`pyport.h`) and
  exercises `_Py_atomic_store`/`_Py_atomic_load` and their `_relaxed`
  variants on both `_Py_atomic_int` and `_Py_atomic_address`:

  ```text
  $ bash scripts/vc6-probe-core.sh scripts/fixtures/vc6_atomic_smoke.c
  == MSVC600 Py_BUILD_CORE compile probe ==
  source : scripts/fixtures/vc6_atomic_smoke.c
  ...
  vc6_atomic_smoke.c

  == cl.exe exit status: 0 ==
  ```

  No errors, no warnings.

- `cpython/Modules/main.c`, the same real core translation unit identified
  as the next blocker previously. It now compiles *past*
  `pycore_atomic.h` (reached transitively via `pycore_runtime.h` before
  `pycore_interp.h`) and hits a new, different, and unrelated blocker:

  ```text
  $ bash scripts/vc6-probe-core.sh
  == MSVC600 Py_BUILD_CORE compile probe ==
  source : cpython/Modules/main.c
  ...
  cpython\Include\internal\pycore_interp.h(11) : fatal error C1083:
  Cannot open include file: 'stdbool.h': No such file or directory

  == cl.exe exit status: 2 ==
  ```

  `Include/internal/pycore_interp.h` line 11 does `#include <stdbool.h>`
  before its own `#include "pycore_atomic.h"` on line 13 — a C99 standard
  header VC6 does not ship, unrelated to atomics. This is the next blocker
  for this port and is left unaddressed here, out of scope for this slice.

Both probes are covered by a new regression test,
`scripts/vc6-probe-core.test.sh`, which additionally asserts (so this
result cannot regress silently) that a deliberately broken translation
unit still fails with a surfaced `error C` diagnostic, and that
`Modules/main.c`'s current failure is specifically *not* at
`pycore_atomic.h`/`intrin.h` (i.e. that blocker has not resurfaced). Run:
`bash scripts/vc6-probe-core.test.sh`. At the time this atomics slice was
written, this was all 6 checks `ok`; the stdbool slice below added 5 more
checks to the same file (now 11; see that section for the current count
and last-run result). `scripts/vc6-probe.test.sh` was re-run after the
atomics change and still passed (all 6 checks `ok`), confirming the
public-header probe was unaffected.

## stdbool slice (`pycore_interp.h`, VC6 / C99 `<stdbool.h>`)

**`Include/internal/pycore_interp.h` line 11 does `#include <stdbool.h>`**
before its own `#include "pycore_atomic.h"` on line 13 — a C99 standard
header VC6 (`_MSC_VER` 1200, which predates C99 entirely) does not ship.
In VC6's C mode, `bool`/`true`/`false` are not keywords at all (they are
C++-only there), and there is no standard-library `<stdbool.h>` to fall
back on.

The now-added, still-uncommitted `compat/msvc600/stdbool.h` is a
project-local fallback for this single header, **not a patch to CPython
source.** It is picked up purely through include-path ordering: both
`scripts/vc6-probe.sh` and `scripts/vc6-probe-core.sh` already put
`compat/msvc600` first on the VC6 `/I` include path (needed earlier for
`compat/msvc600/inttypes.h`), so VC6's `#include <stdbool.h>` resolves to
this project-local header before it would ever reach a (nonexistent)
system one. Nothing under `cpython/` changes for this slice, so
`compat/msvc600/cpython-3.11.16-vc6-headers.patch` is unchanged. Every
other compiler is unaffected for the same reason a browser's `/I` search
order doesn't affect other browsers: `compat/msvc600` is never added to
any other compiler's include path, so a conforming C99/C11 compiler still
gets its own real `<stdbool.h>` (or built-in `_Bool`/`bool`), untouched.
As defence in depth (not because it is expected to be reachable), the
header itself also `#error`s out if included under anything but
`_MSC_VER < 1300`.

The shim defines the same four names as the standard C99 header —
`bool` (as `int`, since VC6 has no `_Bool` built-in type to alias),
`true`, `false`, and `__bool_true_false_are_defined` — as plain
`#define` macros rather than a typedef, matching the standard's
requirement that a conforming program be able to `#undef`/redefine
`bool`/`true`/`false`.

**Verified with the same two-probe approach used for the atomics slice:**

- `scripts/fixtures/vc6_stdbool_smoke.c` (new) — a minimal, isolated
  translation unit that includes only `<stdbool.h>` and exercises
  `bool`/`true`/`false`/`__bool_true_false_are_defined`:

  ```text
  $ bash scripts/vc6-probe-core.sh scripts/fixtures/vc6_stdbool_smoke.c
  == MSVC600 Py_BUILD_CORE compile probe ==
  source : scripts/fixtures/vc6_stdbool_smoke.c
  ...
  vc6_stdbool_smoke.c

  == cl.exe exit status: 0 ==
  ```

  No errors, no warnings.

- `cpython/Modules/main.c`, the same real core translation unit used to
  verify the atomics slice. It now compiles *past* `pycore_interp.h`
  line 11 (reached the same way as before, transitively via
  `pycore_runtime.h`) — the fatal `stdbool.h`/C1083 error is gone — and
  proceeds through `pycore_atomic.h` and `pycore_ast_state.h` before
  hitting a new, unrelated, and considerably larger blocker; see "Current
  first-blocker evidence" below for the full detail.

Both probes are covered by 5 new checks added to the existing
`scripts/vc6-probe-core.test.sh` (positive isolated-fixture compile,
no-errors check, a negative deliberately-broken-fixture check, its
error-surfaced check, and a check that `Modules/main.c`'s output no
longer contains `Cannot open include file: 'stdbool.h'`), bringing that
file to 11 checks total. Run: `bash scripts/vc6-probe-core.test.sh`. Last
run: all 11 checks `ok` (wine + MSVC600 available in this environment).
`scripts/vc6-probe.test.sh` was re-run after this change and still passes
(all 6 checks `ok`), confirming the public-header probe is unaffected.

## Mixed-declarations header slice (`pycore_code.h`, `pycore_dict.h`, `pycore_list.h`, `pycore_call.h`)

**Scope: the four `Include/internal/pycore_*.h` headers that the
`Modules/main.c` `#include` chain directly reaches with VC6 C89
mixed-declaration violations, and no others.** This is a bounded slice of
the "Compiler language gap" blocker recorded below, not an attempt at the
whole gap: it fixes exactly the sites the real core probe (`Modules/main.c`
via `scripts/vc6-probe-core.sh`) hits inside CPython's own headers, and
stops there. `Modules/main.c` itself has the same pattern pervasively
throughout its own function bodies; that is **explicitly out of scope for
this slice** and is now the next recorded blocker (see "Current
first-blocker evidence" below) rather than something papered over here.

Six `static inline` functions across the four headers declared a variable
after a preceding statement (typically an `assert(...)`), which C89 (VC6's
only supported dialect, give or take Microsoft extensions) does not allow
inside a block — only C99 does. VC6's parser, on hitting the declaration
where it expects a statement, fails to recognize it as a declaration at
all and instead cascades into unrelated-looking `C2065`/`C2109`/`C2106`
errors for the rest of the block, exactly as described for the first
instance (`pycore_code.h:154`) in earlier revisions of this document.

The now-applied, still-uncommitted
`compat/msvc600/cpython-3.11.16-vc6-headers.patch` fixes each site the
same way: hoist the declaration (no initializer) to the top of its
enclosing block, and turn the original `TYPE name = expr;` into a plain
assignment (`name = expr;`) at its original position. This changes no
evaluation order and no semantics — it is the standard, mechanical C89
transform for this exact pattern — and is applied only to the six
functions that actually needed it, not the surrounding file:

- `Include/internal/pycore_code.h`: `_PyLocals_GetKind()`,
  `_PyLocals_SetKind()` (both hoist a `char *ptr`), and
  `adaptive_counter_backoff()` (hoists `unsigned int value`).
- `Include/internal/pycore_dict.h`: `_PyDictValues_AddToInsertionOrder()`
  (hoists `uint8_t *size_ptr` and `int size`).
- `Include/internal/pycore_list.h`: `_PyList_AppendTakeRef()` (hoists
  `Py_ssize_t len` and `Py_ssize_t allocated`).
- `Include/internal/pycore_call.h`: `_PyVectorcall_FunctionInline()`
  (hoists `PyTypeObject *tp`, `Py_ssize_t offset`, and
  `vectorcallfunc ptr`).

Every other compiler is unaffected: these are plain C source edits (no
`#ifdef`/`_MSC_VER` gating, unlike the atomics slice), and hoisting a
declaration without an initializer, then assigning immediately after the
same statements that used to compute the initializer, is behavior-identical
under C89, C99, C11, and C++ alike — no code path, value, or evaluation
order changes for any compiler already accepting the original source.

**Verified with the same two-probe approach used for the atomics and
stdbool slices:**

- `scripts/fixtures/vc6_mixed_decls_smoke.c` (new) — includes the real
  `Python.h` (these four headers assume public types like `PyObject`,
  `PyCodeObject`, `PyListObject`, `PyDictValues`, and `vectorcallfunc`
  already declared, the same way real CPython `.c` sources reach them, so
  full isolation without `Python.h` is not meaningful here unlike the
  atomics/stdbool fixtures) plus all four headers, and calls all six fixed
  functions:

  ```text
  $ bash scripts/vc6-probe-core.sh scripts/fixtures/vc6_mixed_decls_smoke.c
  == MSVC600 Py_BUILD_CORE compile probe ==
  source : scripts/fixtures/vc6_mixed_decls_smoke.c
  ...
  vc6_mixed_decls_smoke.c
  ...
  == cl.exe exit status: 0 ==
  ```

  No errors, no warnings.

- `cpython/Modules/main.c`, the same real core translation unit used for
  the earlier slices. All four headers now compile clean — no
  `pycore_code.h`/`pycore_dict.h`/`pycore_list.h`/`pycore_call.h` error
  appears anywhere in the probe output — and the compiler proceeds
  entirely into `Modules/main.c`'s own body, where a new, considerably
  larger, and out-of-scope-for-this-slice blocker is hit; see "Current
  first-blocker evidence" below.

Both probes are covered by 5 new checks added to
`scripts/vc6-probe-core.test.sh` (positive isolated-fixture compile,
no-errors check, a negative deliberately-broken-fixture check, its
error-surfaced check, and a check that `Modules/main.c`'s output no longer
contains any `pycore_code.h`/`pycore_dict.h`/`pycore_list.h`/
`pycore_call.h` error line), bringing that file to 16 checks total. Run:
`bash scripts/vc6-probe-core.test.sh`. Last run: all 16 checks `ok` (wine +
MSVC600 available in this environment). `scripts/vc6-probe.test.sh` was
re-run after this change and still passes (all 6 checks `ok`), confirming
the public-header probe is unaffected. The patch's reproducibility was
also re-verified directly: `git apply --check --directory=cpython
compat/msvc600/cpython-3.11.16-vc6-headers.patch` against a freshly
stashed (pristine `v3.11.16`) `cpython/` working tree exits 0.

## Modules/main.c declaration-order slice

**Scope: the C89-vs-C99 mixed-declarations pattern inside
`Modules/main.c`'s own function bodies only — declaration *position*, not
any other C99 feature. No other file was touched, and no whole-tree
mechanical rewrite was attempted.** This is the follow-on to the
"Mixed-declarations header slice" above: the same pattern (a block-scope
declaration appearing after a preceding statement, which C89's parser
cannot recognize as a declaration), but recurring roughly a dozen times
across `Modules/main.c`'s own ~740 lines rather than in a handful of small
header functions.

The now-applied, still-uncommitted
`compat/msvc600/cpython-3.11.16-vc6-headers.patch` fixes every site the
same mechanical way used for the header slice: hoist the bare declaration
(no initializer) to the top of its enclosing block, and turn the original
`TYPE name = expr;` into a plain assignment (`name = expr;`) at its
original position. This changes no evaluation order and no semantics for
any compiler, VC6 or otherwise. Two variants of this same transform were
needed, both already implicit in the mechanical rule but worth calling out
explicitly:

- **A declaration whose original initializer is a side-effecting call**
  (e.g. `FILE *fp = _Py_fopen_obj(filename, "rb");` in
  `pymain_run_file_obj()`) is hoisted bare and the call is kept as an
  assignment at its *original* position, specifically so the call still
  happens after the same preceding statements (an audit-hook check, in
  this case) instead of moving earlier and changing behavior.
- **A platform-conditional declaration with the same name but a different
  type per branch** (`pymain_run_startup()`'s `env`: `const wchar_t *env`
  under `#ifdef MS_WINDOWS`, `const char *env` under `#else`) is hoisted
  under the identical `#ifdef`/`#else`/`#endif` structure at the top of the
  function, so each platform still only ever sees its own declaration.

Functions touched (8 total, 20 hoisted declarations, all in
`cpython/Modules/main.c`): `pymain_init()` (`preconfig`, `config`),
`pymain_import_readline()` (`mod`), `pymain_run_command()` (`cf`),
`pymain_run_file_obj()` (`fp`, `sb`, `cf`, `run`), `pymain_run_file()`
(`filename`, `program_name`, `res`), `pymain_run_startup()` (`startup`,
`env`, `fp`, `cf`), `pymain_run_stdin()` (a nested-block `exitcode`, plus
outer-scope `cf`, `run`), and `pymain_repl()` (`cf`, `res`).
`pymain_get_importer()`,
`pymain_sys_path_add_path0()`, `pymain_run_module()`,
`pymain_run_interactive_hook()`, `pymain_run_python()`, `Py_RunMain()`,
and `pymain_main()` were inspected and found to already declare every
local before the first statement in their block (including two
back-to-back declarations in `pymain_run_python()`'s `else if
(!config->safe_path)` block, which is valid C89 since no statement
separates them) — left untouched, consistent with "only the sites that
actually need it."

**A note on scope, since it matters for what this slice does and does not
claim:** several of the hoisted declarations are of type `PyCompilerFlags`
or are assigned via `_PyStatus_OK()`, both of which are initialized through
C99 compound-literal macros (`_PyCompilerFlags_INIT`, `_PyStatus_OK()`).
Hoisting the *declaration* is still the correct, necessary C89 fix for the
mixed-declaration violation at each of those sites — it eliminates that
specific error class everywhere it appeared in `main.c`, as confirmed
below — but the compound-literal *initializer itself* is a separate C99
feature VC6 does not support at any declaration position. That is a new,
distinct blocker, not a residue of this slice's fix; see "Current
first-blocker evidence" below, where it is documented rather than
papered over.

**Verified with the same two-probe approach used for the earlier slices:**

- `scripts/fixtures/vc6_decl_order_smoke.c` (new) — a minimal,
  self-contained fixture (no CPython headers) that exercises, in
  isolation, the shape of every hoist pattern used in `main.c`: a bare
  hoist above an early return, a side-effecting-initializer hoist, a
  hoisted pair where fixing the first declaration would otherwise turn an
  immediately-following second declaration into a new violation, a
  nested-block hoist, and the platform-conditional same-name/different-type
  hoist. Kept separate from `main.c` itself so it keeps guarding the
  general transformation shape even as `main.c` changes upstream:

  ```text
  $ bash scripts/vc6-probe-core.sh scripts/fixtures/vc6_decl_order_smoke.c
  == MSVC600 Py_BUILD_CORE compile probe ==
  source : scripts/fixtures/vc6_decl_order_smoke.c
  ...
  vc6_decl_order_smoke.c

  == cl.exe exit status: 0 ==
  ```

  No errors, no warnings.

- `cpython/Modules/main.c` itself, the same real core translation unit
  used throughout this document. Every C2146/C2065/C2275
  declaration-position error is gone; the previous 29-error-line run is
  now down to 8 error lines, all a different error code (`C2059`) at a
  different root cause (compound literals / designated initializers, not
  declaration position — see "Current first-blocker evidence" below for
  the full transcript).

Both probes are covered by 5 new checks added to
`scripts/vc6-probe-core.test.sh` (positive isolated-fixture compile,
no-errors check, a negative deliberately-broken-fixture check, its
error-surfaced check, and a check that `Modules/main.c`'s output no longer
contains any declaration-position error — `C2146`, an "undeclared
identifier" `C2065`, or a type-as-expression `C2275` — anywhere in its own
body), bringing that file to 21 checks total. Run: `bash
scripts/vc6-probe-core.test.sh`. Last run: all 21 checks `ok` (wine +
MSVC600 available in this environment). `scripts/vc6-probe.test.sh` was
re-run after this change and still passes (all 6 checks `ok`), confirming
the public-header probe is unaffected. The patch's reproducibility was
re-verified against a genuinely pristine tree (a fresh `cp -a cpython
/tmp/cpython_pristine_check && git -C /tmp/cpython_pristine_check checkout
-- .`, not a stash of the working checkout): `git apply --check` from
inside that pristine copy exits 0, and after applying, `diff -rq` between
the patched pristine copy and this project's actual `cpython/` working
tree (excluding `.git`) reports no differences. The temporary copy was
removed afterward; nothing under `cpython/` or `compat/` was affected by
this verification step.

## Compound-literal / designated-initializer slice

**Scope: the 8 C99 compound-literal/designated-initializer call sites
inside `Modules/main.c`'s own body only — no header-level macro change,
and no other file touched.** This is the follow-on to the "Modules/main.c
declaration-order slice" above, addressing exactly the blocker that slice
left recorded as out of scope: VC6 (a pre-C99 compiler) supports neither
C99 compound literals (`(PyStatus){...}`) nor C99 designated initializers
(`{ .field = value, ... }`), at any position in a block, regardless of
where the destination variable is declared.

Three distinct patterns were responsible, each fixed a different way, all
still uncommitted in `compat/msvc600/cpython-3.11.16-vc6-headers.patch`:

- **`status = _PyStatus_OK();`** (1 site, `pymain_init()`). Rather than
  reimplementing the macro's field assignment by hand, this is replaced
  with **`status = PyStatus_Ok();`** — the existing public API function
  declared in `Include/cpython/initconfig.h` (`PyAPI_FUNC(PyStatus)
  PyStatus_Ok(void);`) and defined in `Python/initconfig.c` as `PyStatus
  PyStatus_Ok(void) { return _PyStatus_OK(); }` — i.e. it returns the
  exact value the macro would have produced, by construction, not by
  re-derivation. This needed no header change: the function was already
  declared and part of the public ABI; `main.c` just wasn't calling it.
  Behavior is identical for every compiler, VC6 or otherwise — `main.c`
  now calls a function that itself still uses the compound-literal macro
  internally in `Python/initconfig.c`, which is fine because
  `Python/initconfig.c` is not part of this slice's compile-only probe (no
  link is attempted or claimed) and is explicitly the next kind of file
  this port will need to work through, not something silently skipped.
- **`cf = _PyCompilerFlags_INIT;`** (5 sites: `pymain_run_command()`,
  `pymain_run_file_obj()`, `pymain_run_startup()`, `pymain_run_stdin()`,
  `pymain_repl()`). No public-API equivalent exists for this one (unlike
  `PyStatus_Ok()`), so each site is replaced with the field-by-field
  assignment the macro itself expands to: `cf.cf_flags = 0;
  cf.cf_feature_version = PY_MINOR_VERSION;`. `PyCompilerFlags` is a
  two-field plain struct (`Include/cpython/compile.h`), and `cf` was
  already declared (bare, no initializer) at the top of its enclosing
  block by the prior declaration-order slice, so this is a pure
  compound-literal-to-assignment substitution with no interaction with
  declaration position.
- **`_PyArgv args = { .argc = argc, ... };`** (2 sites: `Py_Main()`,
  `Py_BytesMain()`). No macro is involved here, just a plain C99
  designated-initializer aggregate initializer on a local variable
  declaration. Replaced with a bare declaration followed by one assignment
  per field (`args.argc = argc; args.use_bytes_argv = 0; ...`); field
  order in the replacement does not matter, unlike the initializer list it
  replaces, since each is now an independent assignment statement.

Every other compiler is unaffected: `PyStatus_Ok()` is a normal function
call (no macro expansion difference for any compiler), and hoisting a
designated-initializer aggregate into field-by-field assignment, or a
compound-literal assignment into field-by-field assignment, changes no
value, no evaluation order, and no code path for any compiler that already
accepted the C99 form — it is strictly a syntax substitution for an
identical runtime effect.

**Verified with the same two-probe approach used for the earlier slices:**

- `scripts/fixtures/vc6_compound_literal_smoke.c` (new) — includes the
  real `Python.h`/`pycore_initconfig.h` (like
  `vc6_mixed_decls_smoke.c`, since `PyStatus`, `PyCompilerFlags`, and
  `_PyArgv` are real CPython types, not reproducible in isolation the way
  the atomics/stdbool fixtures are) and exercises all three replacement
  patterns:

  ```text
  $ bash scripts/vc6-probe-core.sh scripts/fixtures/vc6_compound_literal_smoke.c
  == MSVC600 Py_BUILD_CORE compile probe ==
  source : scripts/fixtures/vc6_compound_literal_smoke.c
  ...
  vc6_compound_literal_smoke.c

  == cl.exe exit status: 0 ==
  ```

  No errors, no warnings.

- `cpython/Modules/main.c` itself, the same real core translation unit
  used throughout this document. Every `C2059` compound-literal/
  designated-initializer error is gone — the previous 8-error-line run is
  now **0 error lines**, and the probe reports `cl.exe exit status: 0`:

  ```text
  $ bash scripts/vc6-probe-core.sh
  == MSVC600 Py_BUILD_CORE compile probe ==
  source : cpython/Modules/main.c
  prefix : /home/ubuntu/.wine-win9xport

  Setting environment for using Microsoft Visual C++ tools.
  main.c
  ...
  == cl.exe exit status: 0 ==
  ```

  (The only other output is MSVC600's standard informational `NOTE:` about
  `WINVER` 0x0500 being a beta-era SDK combination, present on every probe
  run in this environment, not new to this slice and not an error or
  warning.) **This is a compile-only (`/c`) result for one translation
  unit** — `scripts/vc6-probe-core.sh` never invokes the linker (see its
  own header comment) — **not a claim that `Modules/main.c` links, that
  `pythoncore`/`python.exe` builds, or that anything runs on Windows 9x.**

Both probes are covered by 6 new checks added to
`scripts/vc6-probe-core.test.sh` (positive isolated-fixture compile,
no-errors check, a negative deliberately-broken-fixture check, its
error-surfaced check, a check that `Modules/main.c`'s output no longer
contains any `C2059` compound-literal/designated-initializer error
anywhere in its own body, and a new end-to-end check that the
`Modules/main.c` probe itself now exits 0), bringing that file to 27
checks total. Run: `bash scripts/vc6-probe-core.test.sh`. Last run: all 27
checks `ok` (wine + MSVC600 available in this environment).
`scripts/vc6-probe.test.sh` was re-run after this change and still passes
(all 6 checks `ok`), confirming the public-header probe is unaffected. The
patch's reproducibility was re-verified against a genuinely pristine tree
(a fresh `cp -a cpython /tmp/cpython_pristine_check && git -C
/tmp/cpython_pristine_check checkout -- .`, not a stash of the working
checkout): `git apply --check` from inside that pristine copy exits 0, and
after applying, `diff -rq` between the patched pristine copy and this
project's actual `cpython/` working tree (excluding `.git`) reports no
differences. The temporary copy was removed afterward; nothing under
`cpython/` or `compat/` was affected by this verification step.

## Next blocker: `Python/pylifecycle.c`

After the PyRuntime section slice, the same real core probe was re-run:

```text
$ bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c
== MSVC600 Py_BUILD_CORE compile probe ==
source : cpython/Python/pylifecycle.c
...
cpython\Python\pylifecycle.c(112) : error C2059: syntax error : '.'
cpython\Python\pylifecycle.c(112) : error C2059: syntax error : ','
cpython\Python\pylifecycle.c(130) : error C2059: syntax error : '{'
cpython\Python\pylifecycle.c(189) : error C2143: syntax error : missing ';' before 'type'
cpython\Python\pylifecycle.c(190) : error C2143: syntax error : missing ';' before 'type'
...
cpython\Python\pylifecycle.c(1232) : fatal error C1003: error count exceeds 100; stopping compilation

== cl.exe exit status: 2 ==
```

The prior first blocker at `Python/pylifecycle.c:91-92` is gone: VC6 no
longer reports `warning C4068: unknown pragma` for `#pragma section`, and no
longer rejects `__declspec(allocate("PyRuntime"))` with `C2341`. The new exact
first blocker is now the `_PyRuntimeState_INIT` designated-initializer macro
used by `_PyRuntime` itself (`C2059: syntax error : '.'` at the definition
line, now line 112 after the VC6 guard was added). After that, the file still
reaches the previously known broader C99 compound-literal/designated-initializer
and C89 mixed-declaration wall, eventually hitting the compiler's 100-error
cap. This slice did not attempt those broader `pylifecycle.c` rewrites.

## Current first-blocker evidence

**The previously recorded `long long` / C99 integer-suffix blocker is now
resolved and verified.** The uncommitted
`compat/msvc600/cpython-3.11.16-vc6-headers.patch` (already applied to the
`cpython/` working tree) replaces bare `long long` with the existing
`PY_LONG_LONG` macro in `Include/longobject.h`, `Include/pythread.h`, and
`Include/pyexpat.h`, and introduces a `PY_LL`/`PY_ULL` literal-suffix macro
pair (spelled `i64`/`ui64` for `_MSC_VER < 1300`, i.e. VC6) in `PC/pyconfig.h`
and `Include/pyport.h`, used in place of raw `123LL`/`123ULL` literals in
`Include/pythread.h`. With this patch applied, the full public header stack
compiles cleanly:

```text
$ bash scripts/vc6-probe.sh
== MSVC600 compile probe ==
source : cpython/Programs/python.c
prefix : /home/ubuntu/.wine-win9xport

Setting environment for using Microsoft Visual C++ tools.
python.c

== cl.exe exit status: 0 ==
```

`cpython/Programs/python.c` (`#include "Python.h"` plus a `wmain`/`main`
stub) now compiles to `build/vc6-probe/python.obj` (verified present,
7115 bytes) with exit status 0. This exercises the entire public
`Include/*.h` surface reachable from `Python.h`, not just `pyport.h`.

**The `pycore_atomic.h`/`intrin.h` blocker, the `pycore_interp.h`/
`<stdbool.h>` blocker, and the mixed-declarations blocker in
`pycore_code.h`/`pycore_dict.h`/`pycore_list.h`/`pycore_call.h` described
in earlier revisions of this document are all now resolved; see "Atomics
slice", "stdbool slice", and "Mixed-declarations header slice" above for
full detail.** Probing the same real core translation unit
(`cpython/Modules/main.c`, which needs `Include/internal` on the include
path and `Py_BUILD_CORE` defined — both required unconditionally by every
`pycore_*.h` header) now gets past all of CPython's internal headers
reachable from its `#include` chain with no header-level error at all, and
the compiler proceeds into `Modules/main.c`'s own body — where it hits a
new wall, spread across nearly the entire 743-line file:

```text
$ bash scripts/vc6-probe-core.sh
== MSVC600 Py_BUILD_CORE compile probe ==
source : cpython/Modules/main.c
...
cpython\Modules\main.c(44) : error C2275: 'PyPreConfig' : illegal use of this type as an expression
cpython\Modules\main.c(44) : error C2146: syntax error : missing ';' before identifier 'preconfig'
cpython\Modules\main.c(44) : error C2065: 'preconfig' : undeclared identifier
...
cpython\Modules\main.c(52) : error C2275: 'PyConfig' : illegal use of this type as an expression
...
cpython\Modules\main.c(215) : error C2275: 'PyObject' : illegal use of this type as an expression
...
cpython\Modules\main.c(253) : error C2275: 'PyCompilerFlags' : illegal use of this type as an expression
...
== cl.exe exit status: 2 ==
```

(29 distinct error source lines total in that run, spanning lines 44
through 734 of `main.c` — effectively the whole file — across roughly a
dozen separate functions/blocks.)

**This mixed-declarations pattern inside `Modules/main.c`'s own body is now
resolved and verified; see "Modules/main.c declaration-order slice" above
for full detail.** With that fix applied, the same probe now gets past
every declaration-position error and hits a new, different, and
out-of-scope-for-that-slice blocker:

```text
$ bash scripts/vc6-probe-core.sh
== MSVC600 Py_BUILD_CORE compile probe ==
source : cpython/Modules/main.c
...
cpython\Modules\main.c(71) : error C2059: syntax error : '{'
cpython\Modules\main.c(256) : error C2059: syntax error : '{'
cpython\Modules\main.c(366) : error C2059: syntax error : '{'
cpython\Modules\main.c(448) : error C2059: syntax error : '{'
cpython\Modules\main.c(531) : error C2059: syntax error : '{'
cpython\Modules\main.c(564) : error C2059: syntax error : '{'
cpython\Modules\main.c(748) : error C2059: syntax error : '.'
cpython\Modules\main.c(760) : error C2059: syntax error : '.'

== cl.exe exit status: 2 ==
```

Down from 29 error lines to 8. Every one of these is the *same* new root
cause, unrelated to declaration position: a **C99 compound literal**,
optionally with **designated initializers**, neither of which VC6 (a
pre-C99 compiler) supports at all, at any position in a block. Two
distinct macros/patterns are responsible:

- `main.c:71`, `256`, `366`, `448`, `531`, `564` — six sites assigning
  `PyCompilerFlags cf = _PyCompilerFlags_INIT;` (now `cf =
  _PyCompilerFlags_INIT;` after the declaration-order fix) or `status =
  _PyStatus_OK();`. `_PyCompilerFlags_INIT` and `_PyStatus_OK()` are
  defined in `Include/cpython/compile.h` and
  `Include/internal/pycore_initconfig.h` respectively as C99 compound
  literals with designated initializers, e.g.:
  ```c
  #define _PyStatus_OK() \
      (PyStatus){._type = _PyStatus_TYPE_OK,}
  #define _PyCompilerFlags_INIT \
      (PyCompilerFlags){.cf_flags = 0, .cf_feature_version = PY_MINOR_VERSION}
  ```
  `(PyStatus){...}` is a compound literal (C99 §6.5.2.5); `._type = ...`
  inside it is a designated initializer (C99 §6.7.8). VC6 recognizes
  neither construct and reports the same `C2059: syntax error : '{'` for
  every one, regardless of whether the assignment is the first statement
  in its block or not — hoisting the declaration (already done) cannot fix
  this, because the problem is the initializer expression's syntax, not
  where the variable is declared.
- `main.c:748`, `760` — the two `_PyArgv args = { .argc = argc, ... };`
  aggregate initializations in `Py_Main()`/`Py_BytesMain()`, which use
  plain C99 designated-initializer syntax (no compound-literal macro
  involved, just `{ .field = value, ... }` directly in a local variable's
  initializer) for the same reason: VC6 predates C99 designated
  initializers entirely.

This is a **distinct C99 language-feature gap from mixed declarations**,
narrower in one sense (it doesn't force auditing every block in the file
the way declaration-position did) but not fixable by moving code around:
the fix, when attempted, will need to replace each compound-literal
initializer with explicit field-by-field assignment statements (e.g. `cf.cf_flags
= 0; cf.cf_feature_version = PY_MINOR_VERSION;`) or an equivalent
non-compound-literal C89 construct, and — for `_PyStatus_OK()` /
`_PyCompilerFlags_INIT` specifically — probably wants a header-level macro
change (in `pycore_initconfig.h` / `cpython/compile.h`) analogous to the
`_Py_ATOMIC_VC6_X86` gating already used for `pycore_atomic.h`, rather than
a per-call-site rewrite in every `.c` file that uses these macros, since
they are used far more broadly than just `Modules/main.c`. **No such fix is
attempted here; it is out of scope for this narrowly-scoped
declaration-order pass and is recorded as the next blocker.** No link or
runtime success is claimed at this or any earlier point in this document.

**Update: this blocker (all 8 `C2059` sites above) is now resolved for
`Modules/main.c`, via a per-call-site rewrite rather than the header-level
macro change speculated above** — see "Compound-literal /
designated-initializer slice" above for what was actually done and why
the per-call-site approach (not the header macro change) was chosen for
this narrow slice, and "Next blocker: `Python/pylifecycle.c`" above for
where the same two blocker classes (mixed declarations and compound
literals/designated initializers) recur next. This "Current first-blocker
evidence" section is kept as a historical record of how the diagnosis
proceeded; it is no longer the current state.

## Larger blockers to plan for

1. **Build-system mismatch:** CPython 3.11's Windows build expects Visual Studio
   2017-era MSBuild/vcxproj tooling. VC6 cannot consume the build as-is. A
   dedicated minimal VC6 makefile/project set is required.
2. **Compiler language gap:** CPython 3.11 source and headers use C99-era and
   later MSVC features that VC6 does not implement. Compatibility macros and
   carefully scoped source backports are required.
   - VC6's C89-only parser rejects CPython's pervasive C99-style mixed
     declarations-and-code. The instances of this pattern in four
     `Include/internal/pycore_*.h` headers reachable from `Modules/main.c`
     are fixed (see "Mixed-declarations header slice" above), and the
     same pattern recurring throughout `Modules/main.c`'s own body (29
     error sites across roughly a dozen functions) is also now fixed (see
     "Modules/main.c declaration-order slice" above). Whether this pattern
     recurs in CPython's other `.c` sources has not yet been surveyed;
     each file would need its own probe-and-fix pass the same way
     `main.c` did, not a whole-tree sweep in one change.
   - **VC6 does not support C99 compound literals or designated
     initializers at all**, independent of declaration position. The 8
     sites of this pattern in `Modules/main.c` itself (`_PyStatus_OK()`,
     `_PyCompilerFlags_INIT`, and inline `{ .field = value }`
     initialization in `Py_Main()`/`Py_BytesMain()`) are now fixed via a
     per-call-site rewrite, not a header-level macro change (see
     "Compound-literal / designated-initializer slice" above for why: a
     public-API function already existed for `_PyStatus_OK()`, and the
     other two patterns are cheap to rewrite in place without touching
     shared headers used far more broadly than `main.c`). `_PyStatus_OK()`
     and `_PyCompilerFlags_INIT` are still used, unmodified, at many other
     call sites across CPython outside `main.c` — this fix is scoped to
     `main.c` only, as directed; a header-level VC6 branch (mirroring
     `_Py_ATOMIC_VC6_X86`) remains a live option if a future slice finds
     the per-call-site approach doesn't scale to the rest of the codebase.
     The same two patterns (mixed declarations and compound literals) both
     recur in `Python/pylifecycle.c`, the next core translation unit in
     `main.c`'s own call chain; see "Next blocker: `Python/pylifecycle.c`"
     above. Not yet fixed there.
3. **Win9x API gap:** CPython 3.11's Windows layer assumes NT-family Unicode,
   synchronization, process, filesystem, and networking APIs. Windows 98 has
   no wide-character file APIs and lacks multiple newer kernel APIs.
4. **Runtime/library gap:** SSL, SQLite, ctypes, multiprocessing, asyncio,
   Unicode filesystem behavior, and parts of subprocess will need explicit
   feature gates or Win9x-specific implementations.
5. **Validation gap:** final success requires booting the built executable on
   Windows 98 SE; Wine compilation alone is not proof of Win9x runtime
   compatibility.

## Recommended next implementation slice

Do not attempt the complete CPython solution yet. The public header surface
compiles; `Include/internal/pycore_atomic.h` compiles for VC6/`_M_IX86`
(see "Atomics slice" above); `Include/internal/pycore_interp.h`'s
`<stdbool.h>` include now resolves via the project-local
`compat/msvc600/stdbool.h` shim (see "stdbool slice" above); the C99
mixed-declarations pattern in the four `pycore_*.h` headers reachable from
`Modules/main.c` is fixed (see "Mixed-declarations header slice" above);
that same pattern inside `Modules/main.c`'s own body is fixed (see
"Modules/main.c declaration-order slice" above); and the C99
compound-literal/designated-initializer pattern inside `Modules/main.c`'s
own body is now also fixed (see "Compound-literal /
designated-initializer slice" above). **`cpython/Modules/main.c` now
compiles with `cl.exe` exit status 0** under `scripts/vc6-probe-core.sh`
— no errors, no warnings — a compile-only (`/c`) result for this one
translation unit; no link or runtime claim is made.

The next blocker is still `Python/pylifecycle.c`, the next core translation
unit in `main.c`'s own call chain (via `Py_InitializeFromConfig()`), but it
has advanced past the VC6-incompatible PyRuntime section pragma. See "Next
blocker: `Python/pylifecycle.c`" above for the current probe transcript. It
now hits the same two already-solved blocker classes recurring at greater
scale (mixed declarations, compound literals/designated initializers), plus
enough sites of both to hit the compiler's 100-error cap before the whole
file is seen, so the true scope is not yet known. Recommended next steps:

1. Continue with `Python/pylifecycle.c` by applying the same two mechanical
   transforms already validated on `Modules/main.c` — hoist mid-block
   declarations (declaration-order slice) and replace compound-literal/
## Latest revision (`mathmodule.c` guarded VC6 `cbrt` fallback slice)

---

## Diagnostic-only confirmation of Win32 loader-search constants frontier

Date: 2026-09-25 02:50 UTC

Before probing, read `PORT_STATUS.md`, `README.md`, and the active-profile reference `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md`. Verified CPython remains detached at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. The outer checkout already had modifications to this status, the generated compatibility patch, and the frontier regression script; the nested CPython checkout already had extensive local port edits. Preserved all existing state. No reset, clean, stash, discard, commit, push, or publication occurred.

Attempted the requested single focused coding-agent delegation for read-only frontier review, but the delegation tool failed before launch because the runtime lacks the required `anthropic` package. No child ran and no independent review is claimed. Since the actual frontier is an unresolved Win9x-visible API-contract choice, no implementation delegation or source edit was appropriate; this run is diagnostics-only.

Forced a fresh MSVC600 source-list probe. `_blake2/blake2s_impl.c` still compiles, as do 39 of 40 sources. The first stable blocker is unchanged: five C2065 diagnostics at `posixmodule.c(15856)`–`(15860)` for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. They are exported as Windows `os` constants; inventing fallback values or omitting exports would alter the Win9x-visible API contract. Later C89 diagnostics begin at line 16173 and remain separate. No compatibility behavior was guessed or changed.

Files changed by this run: `PORT_STATUS.md` only. No CPython source, test, or compatibility patch was modified.

Exact commands/results:

| Command | Exit/result |
|---|---|
| `git status --short --branch && git -C cpython status --short --branch && git -C cpython rev-parse HEAD && git -C cpython describe --tags --exact-match` | 0; preserved pre-existing outer and nested modifications; baseline remains `v3.11.16` / `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; `_blake2/blake2s_impl.c` compiled; 39/40 sources compiled. First errors are the five C2065 loader-search constants at `posixmodule.c(15856)`–`(15860)`; later C89 diagnostics begin at 16173. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all wine cmd /c 'call Z:\home\ubuntu\Organized\Legacy-Ports\Projects\python-win9x\MSVC600\VC98\Bin\VCVARS32.BAT && cl'` | 0; banner `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; shell syntax and all applicable regression suites passed. |
| `git -C cpython diff --check && cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch && git diff --check -- . ':!compat/msvc600/cpython-3.11.16-vc6-headers.patch'` | 0; nested whitespace check passed, generated patch reproduces full nested diff byte-for-byte, and non-generated outer diff check passed. |

This is compiler-probe progress only. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next step: resolve and document intended Win9x `os` API behavior for the five Windows-7-era loader-search constants, then add a focused failing regression test before any source change. Keep later C89 diagnostics separate.

---
## Latest revision (diagnostic-only forced compiler frontier confirmation)

Date: 2026-09-25 15:15 UTC

Read `PORT_STATUS.md`, `README.md`, and the active-profile CPython/Win9x/MSVC6 reference before acting. Preserved the pre-existing outer modifications to this status, the compatibility patch, and the frontier regression script, along with all nested CPython edits. The nested checkout remains detached at CPython `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. No reset, clean, stash, discard, commit, push, or publication occurred.

The `_blake2/blake2s_impl.c` compile state is still true, but it is not the active frontier: a forced fresh source-list probe compiled 39 of 40 listed sources, including `_blake2/blake2s_impl.c`. The first stable blocker remains five C2065 undeclared identifiers in `posixmodule.c(15856)`–`(15860)`: `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. These are exported as `_LOAD_LIBRARY_SEARCH_*` integer constants by the Windows `os` module. Later C89 errors begin at `posixmodule.c(16173)` and are separate. Since deciding whether to expose fallback values or suppress exports changes the Win9x-visible API contract, and the available evidence does not establish that intended behavior, this run made no source/test/patch implementation and delegated no coding agent. This is compiler-probe progress only.

Files changed in this run: `PORT_STATUS.md` only. Existing compatibility work remains preserved.

Exact commands and results:

| Command | Exit/result |
|---|---|
| `git status --short --branch` | 0; outer checkout already had modifications to `PORT_STATUS.md`, `compat/msvc600/cpython-3.11.16-vc6-headers.patch`, and `scripts/vc6-probe-pythoncore-frontier.test.sh`. |
| `git -C cpython status --short --branch && git -C cpython rev-parse HEAD && git -C cpython describe --tags --exact-match` | 0; existing nested edits preserved; detached at `v3.11.16` / `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; total=40, compiled=39, cached=0, skipped=0. `_blake2/blake2s_impl.c` compiled. First stable errors are the five C2065 loader-search identifiers at `posixmodule.c(15856)`–`(15860)` above; later C89 diagnostics start at 16173. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; shell syntax and all applicable regression suites passed. |
| `git -C cpython diff --check && cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | 0; nested diff passes whitespace checks and the generated compatibility patch matches the complete nested diff byte-for-byte. |
| `git diff --check -- . ':!compat/msvc600/cpython-3.11.16-vc6-headers.patch'` | 0; non-generated outer diff passes whitespace check. |

No `pythoncore.dll`/`python.exe` link, Wine interpreter execution, or real Windows 98 SE execution is verified. Next: establish the intended Win9x-visible behavior/API contract for the five loader-search constants from authoritative API evidence before writing a focused failing test and making any source change. Keep the later C89 diagnostics separate.

---
## Latest revision (forced fresh VC6 frontier confirmation; loader-search constants remain blocker)

Date: 2026-09-25 17:18 UTC

Read `PORT_STATUS.md`, `README.md`, and the active-profile CPython/Win9x/MSVC6 reference before acting. Preserved all pre-existing outer and nested modifications. CPython remains detached at baseline tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. No reset, clean, stash, discard, commit, push, or publication occurred.

Re-forced the full source-list probe before deciding whether to continue the earlier `_blake2/blake2s_impl.c` sequence. That file still compiles, but is not the current frontier: 39/40 listed sources compile. First stable blocker remains five C2065 undeclared identifiers in `posixmodule.c(15856)`–`(15860)`: `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. These are exported as `_LOAD_LIBRARY_SEARCH_*` constants by the Windows `os` module initialization. Arbitrary fallback values or suppressing those exports would determine Win9x-visible API behavior, still not established by available evidence. Therefore this run was diagnostic-only; no source/test edits or coding-agent delegation were appropriate. Separate C89 diagnostics begin at line 16173 and are not addressed.

Files changed by this run: `PORT_STATUS.md` only. Existing work in the compatibility patch, regression script, and detached CPython checkout was preserved.

Exact commands and results:

| Command | Exit/result |
|---|---|
| `git status --short --branch && git rev-parse HEAD && git remote -v` | 0; outer pre-existing changes remain; baseline checkout untouched. |
| `git -C cpython status --short --branch && git -C cpython rev-parse HEAD && git -C cpython describe --tags --exact-match && rg -n -C 4 'LOAD_LIBRARY_SEARCH_(DEFAULT_DIRS|APPLICATION_DIR|SYSTEM32|USER_DIRS|DLL_LOAD_DIR)|_LOAD_LIBRARY_SEARCH_' cpython/Modules/posixmodule.c` | 0; nested pre-existing edits preserved; confirmed tag/commit and the five exports in the Windows module block. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; total=40, compiled=39, cached=0, skipped=0. `_blake2/blake2s_impl.c` compiles. First errors are the five C2065 diagnostics above; separate C89 diagnostics begin at line 16173. |

Compiler-probe progress only. No `pythoncore.dll`/`python.exe` link, Wine interpreter execution, or real Windows 98 SE execution is verified. Next: obtain authoritative API evidence establishing the intended Win9x behavior for these five exported constants; then add a focused failing regression test before any source change. Keep later C89 diagnostics separate.

---
## Latest revision (forced frontier re-probe; loader-search constants remain first blocker)

Date: 2026-09-26 03:34 UTC

Before probing, read `PORT_STATUS.md`, `README.md`, and the active-profile CPython/Win9x/MSVC6 reference at `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md`. Preserved all existing work: outer modifications to this status, the generated compatibility patch, and the frontier regression script; detached `cpython/` checkout remains locally modified at baseline tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. No reset, clean, stash, discard, commit, push, or publication occurred.

Forced a fresh source-list probe to test whether the recorded `_blake2/blake2s_impl.c` frontier was still active. It is not: the file compiles, and 39/40 listed sources compile. First stable blocker is five C2065 errors in `posixmodule.c(15856)`–`(15860)` for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. Later C89 diagnostics begin at `posixmodule.c(16173)` and are a distinct family. Since the first blocker concerns Win9x-visible `os` constants whose intended API contract is not established, no implementation or coding-agent delegation was appropriate; no source/test edit was made. This is diagnostic-only.

Files changed this run: `PORT_STATUS.md` only. All prior CPython source edits, test edits, and generated compatibility patch were preserved.

Exact commands and results:

| Command | Exit/result |
|---|---|
| `git status --short --branch && git rev-parse HEAD` | 0; outer `main...gitea/main`; pre-existing modifications remain in `PORT_STATUS.md`, compatibility patch, and frontier test. |
| `git -C cpython status --short --branch && git -C cpython rev-parse HEAD && git -C cpython describe --tags --exact-match` | 0; detached, locally modified checkout at `v3.11.16` / `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; total=40, compiled=39, cached=0, skipped=0. `_blake2/blake2s_impl.c` compiled. First five diagnostics are C2065 for the loader-search constants listed above; next distinct C89 family starts at `posixmodule.c(16173)`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; all applicable regression suites passed (`ALL TESTS PASSED`). |
| `git -C cpython diff --check && cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | 0; nested whitespace check passed and generated patch matches the complete nested diff byte-for-byte. |
| `git diff --check -- . ':!compat/msvc600/cpython-3.11.16-vc6-headers.patch'` | 0; non-generated outer diff whitespace check passed. |

Compiler-probe progress only. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next: resolve the intended Win9x `os` API contract for the five exported loader-search constants using authoritative Windows API evidence; then add a focused failing regression before any source change. Keep subsequent C89 diagnostics separate.

---
## Latest revision (scheduled forced VC6 frontier confirmation; loader-search constants remain blocker)

Date: 2026-09-27 12:38 UTC

Read `PORT_STATUS.md`, `README.md`, and the active-profile CPython/Win9x/MSVC6 reference before probing. Preserved all existing outer and nested modifications; no reset, clean, stash, discard, commit, push, or publication. CPython baseline remains tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. The recorded `_blake2/blake2s_impl.c` state remains true, but it is not the current frontier, so no implementation subagent was appropriate.

Forced a fresh compiler probe. It compiled 39/40 listed sources (`total=40 compiled=39 cached=0 skipped=0`), including `_blake2/blake2s_impl.c`. First stable diagnostics remain C2065 at `posixmodule.c(15856)`–`(15860)` for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. Later separate C89 diagnostics start at line 16173 (`PyObject ScandirIteratorType`), followed by line 16220 (`PyObject list`) and 16224 (`trace`). No source/test implementation was safe because the Win9x-visible contract for the five exported constants remains unresolved; this run was diagnostic-only.

Files changed by this run: `PORT_STATUS.md` only. Existing changes to the generated compatibility patch, frontier regression script, and nested CPython sources were preserved.

Exact commands and results:

| Command | Exit/result |
|---|---|
| `git status --short --branch && git -C cpython status --short --branch && git -C cpython rev-parse HEAD && git -C cpython describe --tags --exact-match` | 0; existing modifications preserved; baseline/tag unchanged. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; 39/40 compiled, `_blake2/blake2s_impl.c` compiled; first diagnostics are the five C2065 constants above; later C89 diagnostics begin at `posixmodule.c(16173)`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; all applicable regression suites passed (`ALL TESTS PASSED`). |
| `git -C cpython diff --check` | 0. |
| `cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | 0; generated compatibility patch matches the complete nested diff byte-for-byte. |
| `git diff --check -- . ':(exclude)compat/msvc600/cpython-3.11.16-vc6-headers.patch'` | 0; outer non-generated diff check passed. |

Compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next frontier: establish the intended Win9x-visible contract for the five exported loader-search constants using authoritative API evidence; then add a focused failing test before any source change. Keep later C89 diagnostics separate.

---
## Latest revision (scheduled forced VC6 frontier confirmation; loader-search constants remain blocker)

Date: 2026-09-27 14:42 UTC

Read `PORT_STATUS.md`, `README.md`, and the active-profile legacy-toolchain reference before probing. Preserved all existing outer and nested modifications; no reset, clean, stash, discard, commit, push, or publication. CPython remains tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. The recorded `_blake2/blake2s_impl.c` state remains true, but it is not the active frontier. No implementation subagent or source change was appropriate: the first blocker is still the unresolved Win9x-visible contract for the five exported loader-search constants.

Forced a fresh VC6 source-list probe: 39/40 listed sources compiled (`total=40 compiled=39 cached=0 skipped=0`), including `_blake2/blake2s_impl.c`. The first stable diagnostics remain C2065 at `posixmodule.c(15856)`–`(15860)` for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. Later C89 diagnostics begin at line 16173 (`PyObject ScandirIteratorType`), followed by line 16220 (`PyObject list`) and line 16224 (`trace`); these are separate and were not modified.

Files changed by this run: `PORT_STATUS.md` only. Existing edits to the generated compatibility patch, frontier regression script, and nested CPython source were preserved.

Exact commands and results:

| Command | Exit/result |
|---|---|
| `git status --short --branch; git -C cpython status --short --branch; git -C cpython rev-parse HEAD; git -C cpython describe --tags --exact-match` | 0; existing modifications preserved; baseline/tag unchanged. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; 39/40 compiled; `_blake2/blake2s_impl.c` compiled; first C2065 errors are the five loader-search constants above; subsequent C89 diagnostics begin at line 16173. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; all applicable regression suites passed (`ALL TESTS PASSED`). |
| `git -C cpython diff --check; cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch; git diff --check -- . ':(exclude)compat/msvc600/cpython-3.11.16-vc6-headers.patch'` | 0; nested whitespace check passed, generated patch still matches the complete nested diff byte-for-byte, and outer non-generated diff check passed before this status entry. |

Compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next frontier: establish the intended Win9x-visible contract for the five exported loader-search constants from authoritative API evidence; then write a focused failing test before changing source. Keep subsequent C89 diagnostics separate.

---
## Latest revision (scheduled forced VC6 frontier confirmation; loader-search constants remain blocker)

Date: 2026-09-28 07:12 UTC

Read `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved all existing outer and nested modifications; no reset, clean, stash, discard, overwrite of unrelated work, commit, push, or publication. CPython baseline remains tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. A forced fresh source-list probe confirms `_blake2/blake2s_impl.c` compiles; it is not the active frontier. The first blocker remains five undeclared loader-search constants in `posixmodule.c`; because they are exported `os` constants and the Win9x-visible contract remains unresolved, this run made no speculative source/test changes and did not delegate implementation.

The probe compiled 39/40 sources (`total=40 compiled=39 cached=0 skipped=0`). First stable diagnostics are C2065 at `posixmodule.c(15856)`–`(15860)` for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. Distinct later C89 diagnostics begin at line 16173 (`PyObject ScandirIteratorType`), then line 16220 (`list`) and 16224 (`trace`); left untouched.

Files changed this run: `PORT_STATUS.md` only. Existing compatibility patch, regression tests, and nested CPython edits remain preserved.

Exact commands/results:

| Command | Exit/result |
|---|---|
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; 39/40 compiled. First stable diagnostics are the five C2065 errors above; distinct later C89 diagnostics follow. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all wine cmd /c 'call Z:\home\ubuntu\Organized\Legacy-Ports\Projects\python-win9x\MSVC600\VC98\Bin\VCVARS32.BAT && cl'` | 0; `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; all applicable regression suites passed (`ALL TESTS PASSED`). |
| `git -C cpython diff --check && cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch; git diff --check -- . ':(exclude)compat/msvc600/cpython-3.11.16-vc6-headers.patch'` | 0; nested diff clean, compatibility patch matches complete nested diff byte-for-byte, outer non-generated diff clean. |
| `git -C cpython rev-parse HEAD && git -C cpython describe --tags --exact-match` | 0; baseline remains `v3.11.16` / `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. |

Compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next frontier: establish the intended Win9x-visible contract for the five exported loader-search constants from authoritative API evidence; then add a focused failing test before source changes. Keep later C89 diagnostics separate.

---
## Latest revision (fresh forced frontier check; posixmodule remains first blocker)

Date: 2026-09-28 19:39 UTC

Read `PORT_STATUS.md`, `README.md`, and the active-profile CPython/Win9x/MSVC6 reference. Preserved all pre-existing work, including the extensive detached CPython edits and outer modifications; no reset, clean, stash, discard, commit, push, or publication. Baseline remains CPython tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. `_blake2/blake2s_impl.c` still compiles and is not the current frontier. A fresh forced probe reconfirmed the first stable blocker in `posixmodule.c`; the Win9x-visible contract for its five exported loader-search constants remains unspecified in project evidence, so no speculative implementation slice was made and no coding subagent was appropriate.

Fresh probe compiled 39/40 listed sources (`total=40 compiled=39 cached=0 skipped=0`), including `_blake2/blake2s_impl.c`. First stable diagnostics are C2065 at `posixmodule.c(15856)`–`(15860)` for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. Distinct later C89-related diagnostics begin at line 16173 (`ScandirIteratorType`), then 16220 (`list`) and 16224 (`trace`); left untouched.

Files changed this run: `PORT_STATUS.md` only. No CPython source or test edits. Exact commands/results:

| Command | Exit/result |
|---|---|
| `git status --short --branch && git -C cpython status --short --branch && git -C cpython rev-parse HEAD && git -C cpython describe --tags --exact-match && date -u '+%Y-%m-%d %H:%M UTC'` | 0; existing changes preserved; baseline `v3.11.16` / `41388c9cb160d0886d5ca00d2e6c878260a8a4549`; `2026-09-28 19:39 UTC`. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; 39/40 compiled, zero cached; first stable diagnostics are the five C2065 constants above; subsequent separate C89 diagnostics remain. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; syntax checks and all applicable regression suites passed (`ALL TESTS PASSED`). |
| `git -C cpython diff --check && cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch` | 0; nested diff clean; tracked compatibility patch matches complete nested diff byte-for-byte. |
| `git diff --check -- . ':(exclude)compat/msvc600/cpython-3.11.16-vc6-headers.patch'` | 0; outer non-generated diff check passed. |

Compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next frontier: resolve the intended Win9x-visible contract for the five exported constants from authoritative API evidence; then write a focused failing test before a narrowly scoped implementation. Keep subsequent C89 diagnostics distinct.

---
## Latest revision (scheduled forced fresh VC6 frontier recheck; loader-search constants remain first blocker)

Date: 2026-09-29 08:00 UTC

Read `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before probing. Preserved all existing outer and nested changes. No reset, clean, stash, discard, overwrite of unrelated work, commit, push, or publication. CPython remains detached at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. `_blake2/blake2s_impl.c` remains successful but is not the active frontier. Forced fresh probe reconfirmed the first blocker in `posixmodule.c`; the Win9x API contract for the five exported loader-search constants is unresolved, so this was diagnostic-only and no coding subagent or implementation change was appropriate.

The probe compiled 39/40 listed sources (`total=40 compiled=39 cached=0 skipped=0`), including `_blake2/blake2s_impl.c`. First stable diagnostics are C2065 at `posixmodule.c(15856)`–`(15860)` for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. Separate subsequent C89 diagnostics start at line 16173 (`ScandirIteratorType`), followed by errors at 16220 (`list`), 16224 (`trace`), and 16246; untouched.

Files changed this run: `PORT_STATUS.md` only. Existing compatibility patch changes, frontier test edits, and nested CPython changes were preserved.

Exact commands/results:

| Command | Exit/result |
|---|---|
| `git -C cpython rev-parse HEAD && git -C cpython describe --tags --exact-match && git -C cpython status --short --branch && date -u '+%Y-%m-%d %H:%M UTC'` | 0; baseline/tag unchanged; existing nested modifications preserved; `2026-09-29 08:00 UTC`. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; fresh forced probe compiled 39/40, zero cached; first diagnostics are the five C2065 loader-search constants above; separate C89 diagnostics follow. Full log: `/home/ubuntu/.hermes/profiles/maxwell/cache/scratch/python-win9x-frontier-20260929-0800.log`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; all applicable regression suites and syntax checks passed (`ALL TESTS PASSED`). |
| `git -C cpython diff --check && cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch && git diff --check -- . ':(exclude)compat/msvc600/cpython-3.11.16-vc6-headers.patch'` | 0; nested and outer diff checks passed; generated compatibility patch matches the complete nested diff byte-for-byte. |

Compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution verified. Next frontier: establish authoritative intended Win9x behavior for the five exported loader-search constants; then write a focused failing test before any source edit. Keep later C89 blockers separate.

---
## Latest revision (scheduled forced fresh VC6 frontier recheck; loader-search constants remain first blocker)

Date: 2026-09-29 12:15 UTC

Read `PORT_STATUS.md`, `README.md`, and the project legacy-toolchain reference before probing. The reference is at `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md`; an initial lookup using the default-profile skill path failed (exit 1), then the active-profile reference was read. Preserved all existing work. No reset, clean, stash, discard, commit, push, or publication. CPython remains detached at `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. The recorded `_blake2/blake2s_impl.c` compile state is true, but that source is not the active frontier. Forced fresh probe confirms `posixmodule.c` remains the first blocker. Its Win9x-visible behavior for five exported loader-search constants remains unresolved, so this was diagnostic-only; no implementation subagent or speculative edit was appropriate.

Fresh probe compiled 39/40 listed sources (`total=40 compiled=39 cached=0 skipped=0`), including `_blake2/blake2s_impl.c`. First stable diagnostics: C2065 at `posixmodule.c(15856)`–`(15860)` for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. Distinct subsequent C89 diagnostics begin at line 16173 (`PyObject`/`ScandirIteratorType`), then lines 16220 (`PyObject`/`list`), 16224 (`trace` and cascading errors), and 16246. None were changed.

Files changed this run: `PORT_STATUS.md` only. All existing outer changes and extensive nested CPython edits were preserved.

Exact commands/results:

| Command | Exit/result |
|---|---|
| `git status --short --branch && git -C cpython status --short --branch && git -C cpython rev-parse HEAD && git -C cpython describe --tags --exact-match` | 0; existing edits preserved; baseline remains `v3.11.16` / `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; forced fresh probe compiled 39/40, zero cached; first diagnostics are the five C2065 loader-search constants above; later C89 diagnostics remain. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; all applicable regression suites and syntax checks passed (`ALL TESTS PASSED`). |
| `git -C cpython diff --check && cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch && git diff --check -- . ':(exclude)compat/msvc600/cpython-3.11.16-vc6-headers.patch'` | 0; nested and outer whitespace checks passed; compatibility patch matches complete nested diff byte-for-byte. |

Compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution verified. Next frontier: establish authoritative intended Win9x behavior for the five exported loader-search constants, then add a focused failing test before a narrowly scoped source change. Keep the distinct later C89 blockers separate.

---
## Latest revision (scheduled forced fresh VC6 frontier confirmation; posixmodule remains first blocker)

Date: 2026-09-30 02:41 UTC

Read `PORT_STATUS.md`, `README.md`, and `python-3-win9x-msvc6.md` before probing. Preserved all existing outer and nested changes; no reset, clean, stash, discard, unrelated overwrite, commit, push, or publication. CPython remains detached at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. `_blake2/blake2s_impl.c` remains compilable but is not the active frontier. A forced fresh probe reconfirmed `posixmodule.c` as the first blocker. The intended Win9x-visible contract for its five exported loader-search constants remains unresolved; this was diagnostic-only, with no source/test edit or coding subagent.

The forced probe compiled 39/40 listed sources (`total=40 compiled=39 cached=0 skipped=0`), including `_blake2/blake2s_impl.c`. First stable diagnostics: C2065 at `posixmodule.c(15856)`–`(15860)` for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. Separate subsequent C89 diagnostics begin at line 16173 (`ScandirIteratorType`), then 16220 (`list`), 16224 (`trace`), and 16246; left untouched.

Files changed this run: `PORT_STATUS.md` only. Existing outer patch/test edits and all nested CPython modifications were preserved.

Exact commands/results:

| Command | Exit/result |
|---|---|
| `git status --short --branch; git -C cpython status --short --branch; git -C cpython rev-parse HEAD; git -C cpython describe --tags --exact-match; date -u '+%Y-%m-%d %H:%M UTC'` | 0; pre-existing modifications preserved; baseline/tag unchanged; timestamp `2026-09-30 02:41 UTC`. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; forced fresh probe compiled 39/40 with zero cached sources; first stable errors are the five C2065 constants listed above; later C89 diagnostics remain distinct. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; shell syntax and all applicable regression suites passed (`ALL TESTS PASSED`). |

Compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution verified. Next frontier: establish authoritative intended Win9x behavior for the five exported loader-search constants, then add a focused failing test before any source edit. Keep later C89 diagnostics separate.

---
## Latest revision (scheduled forced fresh VC6 frontier recheck; posixmodule remains blocker)

Date: 2026-09-30 06:52 UTC

Read `PORT_STATUS.md`, `README.md`, and `python-3-win9x-msvc6.md` before probing. Preserved all pre-existing outer and nested modifications; no reset, clean, stash, discard, unrelated overwrite, commit, push, or publication. CPython remains detached at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Forced fresh probe confirms `_blake2/blake2s_impl.c` compiles and is not the active frontier. The first blocker remains five undeclared `LOAD_LIBRARY_SEARCH_*` constants in `posixmodule.c`; intended Win9x-visible API contract remains unresolved, so this was diagnostic-only with no source/test edits and no coding subagent.

The probe compiled 39/40 sources (`total=40 compiled=39 cached=0 skipped=0`). First stable errors are C2065 at `posixmodule.c(15856)`–`(15860)` for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. Separate subsequent C89 diagnostics begin at line 16173 (`ScandirIteratorType`), followed by line 16220 (`list`), line 16224 (`trace`), and line 16246. No compatibility implementation was guessed.

Files changed this run: `PORT_STATUS.md` only. Existing modifications to the outer compatibility patch and frontier test, and all nested CPython changes, were preserved.

Exact commands/results:

| Command | Exit/result |
|---|---|
| `date -u '+%Y-%m-%d %H:%M UTC'; git -C cpython rev-parse HEAD; git -C cpython describe --tags --exact-match; git status --short --branch; git -C cpython status --short --branch` | 0; timestamp `2026-09-30 06:52 UTC`; CPython tag/commit unchanged and all pre-existing modifications preserved. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; forced fresh result 39/40 compiled, zero cached. First diagnostics are the five C2065 errors above; distinct later C89 diagnostics remain. Compiler output showed VC6 environment startup and source compilation; this is a compile probe only. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; all applicable regression suites passed (`ALL TESTS PASSED`). |
| `git -C cpython diff --check; cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch; git diff --check -- . ':(exclude)compat/msvc600/cpython-3.11.16-vc6-headers.patch'` | 0; nested diff clean, generated patch matches complete nested diff byte-for-byte, outer non-generated diff clean. |

Compiler-probe progress only. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution verified. Next frontier: establish authoritative intended Win9x behavior for the five exported loader-search constants, then add a focused failing test before any narrow implementation. Keep later C89 diagnostics separate.

---
## Latest revision (scheduled forced fresh VC6 frontier recheck; posixmodule blocker unchanged)

Date: 2026-09-30 08:53 UTC

Read `PORT_STATUS.md`, `README.md`, and `references/python-3-win9x-msvc6.md` before probing. Preserved all pre-existing outer and nested modifications; no reset, clean, stash, discard, unrelated overwrite, commit, push, or publication. CPython remains detached at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Although `_blake2/blake2s_impl.c` remains in the successfully compiled portion, the recorded state is no longer the active frontier: the forced fresh probe still stops first at `posixmodule.c`. No source/test implementation or coding subagent was appropriate because the Win9x-visible contract for the five exported loader-search constants remains unresolved.

Probe compiled 39/40 listed sources (`total=40 compiled=39 cached=0 skipped=0`). First stable diagnostics are C2065 at `posixmodule.c(15856)`–`(15860)` for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. Separate later C89 diagnostics begin at line 16173 (`ScandirIteratorType`), followed at lines 16220 (`list`), 16224 (`trace`), and 16246; left untouched.

Files changed this run: `PORT_STATUS.md` only. Pre-existing outer patch/test modifications and all nested CPython changes were preserved.

Exact commands/results:

| Command | Exit/result |
|---|---|
| `git -C cpython status --short --branch && git -C cpython rev-parse HEAD && git -C cpython describe --tags --exact-match && date -u '+%Y-%m-%d %H:%M UTC'` | 0; existing nested modifications preserved; baseline/tag unchanged; `2026-09-30 08:53 UTC`. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; forced fresh probe compiled 39/40 with zero cached sources; exact first stable errors are five C2065 identifiers listed above. Full output: `/home/ubuntu/.hermes/profiles/maxwell/cache/scratch/frontier-cron-current.log`. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; syntax validation and all applicable regression suites passed (`ALL TESTS PASSED`). |
| `git -C cpython diff --check; cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch; git diff --check -- . ':(exclude)compat/msvc600/cpython-3.11.16-vc6-headers.patch'` | 0 for all; nested/outer whitespace checks passed and generated compatibility patch byte-matches complete nested diff. |

Compiler-probe progress only. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution verified. Next frontier: establish authoritative intended Win9x behavior for the five exported constants, then add a focused failing test before any narrow source change. Keep later C89 diagnostics separate.

---
## Latest revision (scheduled forced fresh VC6 frontier recheck; posixmodule remains blocker)

Date: 2026-09-30 11:00 UTC

Read `PORT_STATUS.md` and `README.md` before probing. The referenced `python-3-win9x-msvc6.md` was not found in the active profile or project checkout; used the supplied porting instructions and prior status as the available reference. Preserved all pre-existing outer and nested modifications; no reset, clean, stash, discard, unrelated overwrite, commit, push, or publication. CPython remains detached at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Forced fresh probe confirms `_blake2/blake2s_impl.c` compiles but is not the active frontier. First blocker remains five undeclared `LOAD_LIBRARY_SEARCH_*` constants in `posixmodule.c`; the Win9x-visible exported API contract remains unresolved, so no speculative implementation/test edit or coding subagent was appropriate.

Probe compiled 39/40 sources (`total=40 compiled=39 cached=0 skipped=0`). First stable diagnostics: C2065 at `posixmodule.c(15856)`–`(15860)` for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. Separate later C89 diagnostics start at line 16173 (`ScandirIteratorType`), then line 16220 (`list`), line 16224 (`trace`), and line 16246. They remain distinct and untouched.

Files changed this run: `PORT_STATUS.md` only. All pre-existing compatibility patch/test modifications and nested CPython edits were preserved.

Exact commands/results:

| Command | Exit/result |
|---|---|
| `git -C cpython rev-parse HEAD && git -C cpython describe --tags --exact-match && git status --short --branch && git -C cpython status --short --branch && git -C cpython diff --check && cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch; printf 'patch_cmp_exit=%s\\n' "$?"; date -u '+%Y-%m-%d %H:%M UTC'` | 0; baseline/tag unchanged, all existing outer/nested modifications preserved, nested diff clean, compatibility patch matches complete nested diff byte-for-byte; timestamp `2026-09-30 11:00 UTC`. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; forced fresh 39/40 compile; first stable errors are the five C2065 constants above, followed by separate C89 diagnostics. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; syntax checks and all applicable regression suites passed (`ALL TESTS PASSED`). |

Compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution verified. Next frontier: establish authoritative intended Win9x behavior for the five exported loader-search constants, then add a focused failing test before a narrow source change. Keep later C89 diagnostics separate.

---
## Latest revision (scheduled forced fresh VC6 frontier recheck; posixmodule remains blocker)

Date: 2026-09-30 23:24 UTC

Read `PORT_STATUS.md`, `README.md`, and the CPython 3.11.16/Win9x/MSVC6 reference before acting. Preserved all pre-existing outer and nested changes; no reset, clean, stash, discard, unrelated overwrite, commit, push, or publication. CPython remains detached at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Forced fresh probing confirmed `_blake2/blake2s_impl.c` compiles and is not the current frontier. `posixmodule.c` remains the first blocker. The intended Win9x-visible contract for the five exported `LOAD_LIBRARY_SEARCH_*` constants remains unestablished; no source/test implementation or coding subagent was appropriate, so this run was diagnostic-only.

The forced fresh probe compiled 39/40 sources (`total=40 compiled=39 cached=0 skipped=0`). First stable diagnostics: C2065 at `posixmodule.c(15856)`–`(15860)` for `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS`, `LOAD_LIBRARY_SEARCH_APPLICATION_DIR`, `LOAD_LIBRARY_SEARCH_SYSTEM32`, `LOAD_LIBRARY_SEARCH_USER_DIRS`, and `LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR`. Separate later C89 diagnostics begin at line 16173 (`ScandirIteratorType`), 16220 (`list`), 16224 (`trace`), and 16246; left untouched.

Files changed this run: `PORT_STATUS.md` only. Existing outer changes and all nested CPython changes were preserved.

Exact commands/results:

| Command | Exit/result |
|---|---|
| `git status --short --branch; git -C cpython status --short --branch; git -C cpython rev-parse HEAD; git -C cpython describe --tags --exact-match; date -u '+%Y-%m-%d %H:%M UTC'` | 0; all prior modifications preserved, baseline/tag unchanged; timestamp `2026-09-30 23:24 UTC`. |
| `WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` | 2; fresh compile-only probe compiled 39/40, zero cached; first stable diagnostics are the five C2065 errors above; later C89 diagnostics remain distinct. |
| `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh` | 0; syntax checks and all applicable regression suites passed (`ALL TESTS PASSED`). |
| `git -C cpython diff --check; cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch; git diff --check -- . ':(exclude)compat/msvc600/cpython-3.11.16-vc6-headers.patch'` | 0 before this status update; nested/outer diff checks passed and generated compatibility patch matches the complete nested diff byte-for-byte. |

Compiler-probe progress only. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution verified. Next frontier: establish authoritative intended Win9x behavior for the five exported loader-search constants, then add a focused failing test before a narrow source change. Keep later C89 diagnostics separate.

---
## Latest revision (fresh VC6 probe; `_winapi.c` is the actual frontier)

Date: 2026-10-01 20:44 UTC

Read `PORT_STATUS.md`, `README.md`, and the CPython 3.11.16/MSVC6 reference before probing. Preserved all entry-state work in the outer repository and detached CPython checkout; no reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. CPython remains at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. The older `_blake2/blake2s_impl.c` frontier is stale: a forced fresh source-list probe compiled it successfully and found `_winapi.c` as the actual blocker. No source/test implementation was made because the first missing names are part of the `LCMapStringEx`/locale-mapping path, whose Win9x-compatible behavior must be established rather than addressed by speculative constant definitions.

Exact verification:

- `XDG_RUNTIME_DIR="$PWD/build/current-recheck/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2; `total=69 compiled=68 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiles. First stable `_winapi.c` diagnostics: C2065 for `LCMAP_SORTHANDLE` and `LCMAP_HASH` at line 1827. Subsequent distinct diagnostics include C89 declaration-order errors at lines 1832 onward and later missing SDK identifiers; no later cascade is treated as the first blocker. Full output: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1790887487-1598189-2410.log`.
- `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh` — exit 0. `bash scripts/vc6-probe-pythoncore-frontier.test.sh` — exit 1: the established `console type detection preserves control/cleanup order` assertion failed; the `_winapi` regressions and the other listed checks, including the new console readall/Clinic check, passed. This pre-existing suite failure is not attributed to the probe or fixed in this diagnostic run.
- `git -C cpython diff --check -- Modules/_winapi.c && git diff --check -- scripts/vc6-probe-pythoncore-frontier.test.sh` — exit 0.

Files changed this run: `PORT_STATUS.md` only. This is compiler-probe progress, not a linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or Windows 98 SE result. Compatibility patch synchronization remains unresolved. Next frontier: determine and document a valid Win9x-compatible replacement or explicit feature behavior for the `LCMapStringEx` locale-mapping path before editing; then address its C89 declarations in a separate test-first slice. Do not report a completed port.

---
## Latest revision (_PyCode_GetExtra/_PyCode_SetExtra C89 declarations cleared; frontier advances)

Date: 2026-10-02 14:02 UTC

Read `PORT_STATUS.md`, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved all pre-existing outer and detached CPython changes; no reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. CPython remains at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`. Used one focused Codex CLI coding lane (0.153.4, workspace-write; no approval override) for the narrowly scoped test-first edit.

The recorded `_blake2/blake2s_impl.c` state was verified by a forced fresh probe: it compiles, but the actual first blocker is `Objects/codeobject.c`. One C89 declaration-order slice hoisted only locals in `_PyCode_GetExtra` and `_PyCode_SetExtra`, preserving validation, realloc, initialization, free callback, and assignment execution order. Added exact-body assertions to `scripts/vc6-codeobject-c89.test.py`.

Exact commands/results:

- RED: `python3 scripts/vc6-codeobject-c89.test.py cpython/Objects/codeobject.c` — exit 1, expected `_PyCode_GetExtra locals must be declared at function entry`.
- GREEN: same command — exit 0, `codeobject C89 declarations and ownership order: PASS`.
- `bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh` — exit 0.
- `bash scripts/vc6-probe-pythoncore-frontier.test.sh` — exit 1; codeobject check passes, while two unrelated existing assertions fail: console type detection (`console type lookup and cleanup order must remain unchanged`) and numeric dispatch (`ValueError: substring not found`). No unrelated changes attempted.
- Forced fresh probe before edit: `XDG_RUNTIME_DIR="$PWD/build/current-recheck/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2, `total=80 compiled=79 cached=0 skipped=0`. Initial first stable diagnostics were C2275/C2065 in `_PyCode_GetExtra` at lines 1399–1400, followed by declaration-order diagnostics in this file.
- Forced fresh probe after edit (same command) — exit 2, `total=80 compiled=79 cached=0 skipped=0`. `codeobject.c` passes the former `_PyCode_GetExtra`/`_PyCode_SetExtra` diagnostics. The next first stable errors are C2275/C2146/C2065 for late `Py_hash_t h4` at line 1830 and `h5` at 1834; separate later declaration errors remain. The terminal returned the full diagnostic output directly; no stable saved-log path was provided.
- `git diff --check -- scripts/vc6-codeobject-c89.test.py` and `git -C cpython diff --check -- Objects/codeobject.c` — exit 0. A baseline comparison confirmed source edits are confined to these two functions and existing test assertions are preserved.

Files changed by this slice: `cpython/Objects/codeobject.c`, `scripts/vc6-codeobject-c89.test.py`, and this status log. This is compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution. Next frontier: separately test-first hoist only `Py_hash_t h4` and `h5` in the functions at lines 1830/1834, preserving hash computation order. Keep the existing outer regression failures explicit; compatibility patch synchronization remains unresolved.

---
## Latest revision (`PYLONG_FROM_UINT` C89 locals hoisted; frontier reaches long-long syntax)

Date: 2026-10-03 12:05 UTC

Read `PORT_STATUS.md`, `README.md`, and the loaded legacy-toolchain guidance before acting; the referenced on-disk CPython reference remains unavailable. Preserved all pre-existing outer and detached CPython changes; no reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. CPython remains at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`.

The previous status named `PyLong_FromLong()` as the next frontier, but fresh compiler evidence showed the line-364 declarations were emitted from the `PYLONG_FROM_UINT` macro invoked by `PyLong_FromUnsignedLong()`. `PyLong_FromLong()` already had its function locals declared at entry. Used one focused Codex CLI coding lane (`codex-cli 0.153.4`, workspace-write) for a single test-first macro slice. Extended `scripts/vc6-longobject-c89.test.py`, observed expected RED before the source change, then hoisted only `Py_ssize_t ndigits`, `INT_TYPE t`, `PyLongObject *v`, and `digit *p` to the start of the macro's `do` block in `cpython/Objects/longobject.c`. Initializers became assignments at the previous evaluation points. Small-int fast return, digit-count loop, allocation/error path, value consumption/mutation, digit writes, and return order are unchanged. Independently inspected the complete nested diff: the macro is the only new nested source change in this slice; earlier uncommitted `longobject.c` edits are preserved.

Exact verification:

- Forced-fresh MSVC600 probe before the slice: `XDG_RUNTIME_DIR="$PWD/build/current-recheck/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2, `total=95 compiled=94 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. The line-364 errors attributed to `PyLong_FromLong()` in the prior log were actually macro expansion diagnostics: late `Py_ssize_t ndigits`, `INT_TYPE t`, `PyLongObject *v`, and `digit *p` in `PYLONG_FROM_UINT`. Full log: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1791028366-3708731-9a10.log`.
- RED: `python3 scripts/vc6-longobject-c89.test.py cpython/Objects/longobject.c` — exit 1 before the source edit, expected `AssertionError: PYLONG_FROM_UINT must declare ndigits, t, v, and p at do-block entry`.
- GREEN: same command after edit — exit 0; all five focused longobject checks passed, including macro declaration/evaluation/error order.
- Applicable regression: `MSVC600_ROOT=/tmp/pylong-uint-no-toolchain bash scripts/vc6-probe-pythoncore-frontier.test.sh` — exit 1; regression run completed, with only the two known unrelated failures: console type detection/cleanup order and numeric dispatch (`ValueError: substring not found`). The live compiler integration check was intentionally skipped for this suite run; the separate forced-fresh probe below ran with the actual installed toolchain.
- Independent forced-fresh post-change probe (same `XDG_RUNTIME_DIR`, `WINEPREFIX`, and `VC6_FRONTIER_FORCE=1` command) — exit 2, `total=95 compiled=94 cached=0 skipped=0`. `longobject.c` passed the `PYLONG_FROM_UINT` macro declaration diagnostics. First diagnostics now occur at `longobject.c(374)` / `(376)`: C2632, `long` followed by `long` is illegal in the `PyLong_FromUnsignedLongLong` signature and macro argument. Further longobject diagnostics (including C89 sites and missing 64-bit CRT names) remain separate. Full log: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1791028867-3708731-dc50.log`.
- `python3 scripts/vc6-longobject-c89.test.py cpython/Objects/longobject.c`, nested `git diff --check -- Objects/longobject.c`, and outer `git diff --check -- scripts/vc6-longobject-c89.test.py` — exit 0.

Files changed by this slice: `cpython/Objects/longobject.c`, `scripts/vc6-longobject-c89.test.py`, and this status entry. This is compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution. Next frontier: investigate the VC6 `long long` blocker at `PyLong_FromUnsignedLongLong` (including applicable compatibility typedef/macros and declarations) as its own evidence-backed slice; do not bundle later C89/CRT diagnostics. No commit or push.

---
## Latest revision (_PyTypes_InitState status declaration hoisted; object.c frontier advances)

Date: 2026-10-05 UTC

Read `PORT_STATUS.md`, `README.md`, and the CPython Win9x/MSVC6 reference before acting. The expected legacy reference path was absent; the active-profile copy was read at `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md`. Preserved all pre-existing outer and detached CPython work; no reset, clean, stash, discard, commit, push, compatibility-patch regeneration, or publication. CPython remains detached at `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`.

The recorded frontier was freshly rechecked with forced-fresh VC6/Wine compile. `_blake2/blake2s_impl.c` compiled; actual first blocker was `_PyTypes_InitState()` in `cpython/Objects/object.c`, late `PyStatus status = _PyTypes_InitSlotDefs()` at line 1906. Used one focused Codex CLI coding lane (`codex-cli 0.153.4`, workspace-write). It added `scripts/vc6-object-initstate-c89.test.py`; the first run failed RED as intended on missing entry declaration. Then it hoisted only `PyStatus status;` to function entry and retained `status = _PyTypes_InitSlotDefs()` after the non-main-interpreter guard, preserving slot initialization and error handling. All prior dirty/untracked work was preserved.

Exact verification:

- Pre-change forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/cron-current/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2; `total=100 compiled=99 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First stable diagnostics were C2275/C2146/C2065/C2115 at `object.c(1906)` on the late `PyStatus status` declaration. Full log: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1791162097-96506-7360.log`.
- TDD RED: `python3 scripts/vc6-object-initstate-c89.test.py cpython/Objects/object.c` — exit 1 with expected assertion that `_PyTypes_InitState` must declare status at entry.
- GREEN plus applicable focused object regressions (new initstate test, object C89, richcompare, FunctionStr, NotImplemented, descrobject/classmethod, genericaliasobject) — exit 0 for every command. The test asserts entry declaration, exact single declaration, guard, original slot-definitions call assignment point, exception propagation, and return order.
- Applicable harness: `bash scripts/vc6-probe-pythoncore-frontier.test.sh` — exit 1. New source assertion and numerous checks pass; known unrelated console type detection/cleanup assertion and numeric dispatch helper (`ValueError: substring not found`) still fail.
- Post-change forced-fresh probe (same command as pre-change) — exit 2; `total=100 compiled=99 cached=0 skipped=0`. The former PyStatus diagnostics at line 1906 are gone. First remaining errors are C2143/C2065 loop-declaration errors at `object.c(2060)` (`for (size_t i=...)`), followed by another loop declaration at line 2091 and dependent diagnostics. Full log: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1791162455-96506-d5b0.log`.
- `git diff --check -- scripts/vc6-object-initstate-c89.test.py` and `git -C cpython diff --check -- Objects/object.c` — exit 0. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is claimed.

Files changed in this slice: `cpython/Objects/object.c`, `scripts/vc6-object-initstate-c89.test.py`, and this status entry. Compiler-probe progress only. Next frontier: fresh forced-fresh probe before editing, then TDD only the first `for (size_t i=...)` declaration family at `object.c(2060)`; leave the separate line-2091 loop declaration untouched. No commit or push.

## Latest revision (obmalloc default-allocator local hoisted; fresh VC6 frontier advances)

Date: 2026-10-05 12:11 UTC

Read `PORT_STATUS.md`, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved the dirty outer worktree and extensive detached CPython edits; no reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. CPython remains at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`.

Fresh forced-fresh VC6/Wine re-probe confirmed the recorded state: `_blake2/blake2s_impl.c` compiled and the first stable blocker was `Objects/obmalloc.c(239)`, late `PyMemAllocatorEx new_alloc` in `pymem_set_default_allocator()`. One focused Codex CLI lane (`codex-cli 0.153.4`, authenticated, workspace-write; session `01a10bf3-21bf-7562-9c2e-2128573a0d08`) followed TDD. Added `scripts/vc6-obmalloc-default-allocator-c89.test.py`, observed expected RED, then hoisted only `new_alloc` to function entry; the previous `old_alloc` handling, domain switch/assignments, allocator call, debug hook, and return ordering remain unchanged. The agent's preservation comparison confirmed prior local changes remained byte-identical.

Exact verification:

- Before-change forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/cron-current/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2; `total=101 compiled=100 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First errors C2275/C2146/C2065 at `obmalloc.c(239)` on `PyMemAllocatorEx new_alloc`. Full log: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1791201545-269604-c8a0.log`.
- TDD RED: `python3 scripts/vc6-obmalloc-default-allocator-c89.test.py cpython/Objects/obmalloc.c` — exit 1; expected message `new_alloc must be declared once without initializer at function entry`.
- GREEN and independent focused rerun: same command — exit 0; `obmalloc default allocator C89 declaration and execution order: PASS`. Existing tracemalloc positional-initializer test also passes: `python3 scripts/vc6-obmalloc-tracemalloc-init-c89.test.py cpython/Objects/obmalloc.c cpython/Include/internal/pycore_pymem.h` — exit 0.
- Applicable suite: `bash scripts/vc6-probe-pythoncore-frontier.test.sh > /tmp/obmalloc-lane-frontier.log 2>&1` — exit 1. Two existing unrelated failures remain: console type detection/cleanup order and numeric dispatch helpers. Live one-source integration test also ran and correctly reported a nonzero first-blocker status. Full 322-line output: `/tmp/obmalloc-lane-frontier.log`.
- Post-change forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/cron-current/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-current/obmalloc-default-allocator-post.log 2>&1` — exit 2; `total=101 compiled=100 cached=0 skipped=0`. `obmalloc.c(239)` declaration diagnostics are gone. Next diagnostics are C2059 on `{` at lines 244, 247, and 250 in the three `new_alloc = (PyMemAllocatorEx)PY*_ALLOC;` assignments; later separate declaration/type families remain untouched. Full log: `build/cron-current/obmalloc-default-allocator-post.log`.
- `git diff --check`, nested `git -C cpython diff --check -- Objects/obmalloc.c`, focused tests — exit 0. Baseline tag/commit unchanged.

Files changed in this slice: `cpython/Objects/obmalloc.c`, new `scripts/vc6-obmalloc-default-allocator-c89.test.py`, and this status entry. Compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution. Next frontier: fresh forced probe before editing, then address only the cast/initializer assignment family in `pymem_set_default_allocator()` with a distinct TDD test; preserve the verified declaration change and all subsequent blockers separately.

---
## Latest run (RawStrdup frontier reconfirmed; implementation lane unavailable)

Date: 2026-10-06 UTC

Read this status, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved the existing dirty outer worktree and detached CPython modifications; no reset, clean, stash, discard, commit, push, publication, or patch regeneration. CPython remains at `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`.

The recorded `_PyMem_RawStrdup()` frontier was forced-fresh re-probed and remains accurate. `_blake2/blake2s_impl.c` compiled; `Objects/obmalloc.c` is the first failing translation unit. First stable diagnostics are C2143 at lines 697-698 on declarations following `assert` in `_PyMem_RawStrdup()`, followed by C2065 cascades for `copy` and `size`. The separate `_PyMem_Strdup()` declarations at lines 710-711 and subsequent obmalloc diagnostics remain untouched.

One focused coding-subagent delegation was attempted for only `_PyMem_RawStrdup()` and failed before startup because the Hermes runtime lacks the `anthropic` package and lazy installs are disabled. `codex-cli 0.153.4` is installed, but no external CLI lane was started in the shared dirty checkout. No source or regression test was edited; this run is diagnostics-only.

Exact verification:

- Forced-fresh VC6/Wine probe: `XDG_RUNTIME_DIR="$PWD/build/cron-current/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2; `total=101 compiled=100 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First stable diagnostics: C2143 at `obmalloc.c(697-698)`, followed by C2065 for `copy` and `size`. Full output: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1791256009-486631-f230.log`. The output invokes MSVC600 via Wine but has no standalone compiler-version banner.
- Focused regressions: `python3 scripts/vc6-obmalloc-rawwcsdup-c89.test.py cpython/Objects/obmalloc.c && python3 scripts/vc6-obmalloc-setup-allocators-c89.test.py cpython/Objects/obmalloc.c && python3 scripts/vc6-obmalloc-default-allocator-c89.test.py cpython/Objects/obmalloc.c && python3 scripts/vc6-obmalloc-tracemalloc-init-c89.test.py cpython/Objects/obmalloc.c cpython/Include/internal/pycore_pymem.h` — exit 0; all four passed.
- Applicable harness: `bash scripts/vc6-probe-pythoncore-frontier.test.sh` — exit 1. The obmalloc checks passed; two known unrelated failures remain: console type detection/cleanup order and numeric dispatch (`ValueError: substring not found`).
- `git -C cpython diff --check -- Objects/obmalloc.c` and `git diff --check -- PORT_STATUS.md` — exit 0. CPython tag and commit checks passed; baseline unchanged.

Files changed this run: `PORT_STATUS.md` only. Compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution. Next: retry one focused TDD coding lane for `_PyMem_RawStrdup()` when delegation is available; keep `_PyMem_Strdup()` and later obmalloc diagnostics as separate slices.

---
## Latest revision (_PyMem_RawStrdup C89 declarations hoisted; frontier advances)

Date: 2026-10-06 05:26 UTC

Read `PORT_STATUS.md`, `README.md`, and the CPython Win9x/MSVC6 reference before acting. Preserved all existing outer and detached CPython work; no reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. CPython baseline remains `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549`.

The recorded `_PyMem_RawStrdup()` frontier was forced-fresh re-probed and remains current. `_blake2/blake2s_impl.c` compiled, followed by 95 other source files; `Objects/obmalloc.c` remained the first failing translation unit. Before the edit, VC6's first stable diagnostics were C2143 at lines 697-698, before the declarations following `assert(str != NULL)`, followed by C2065 cascades for `copy` and `size`. One focused Codex CLI lane (`codex-cli 0.153.4`, session `01a10fa7-a787-7c40-a8ce-88b6fc719855`, workspace-write) performed the one-slice TDD change. It added a focused assertion to the existing RawWcsdup regression script, observed the intended RED, then hoisted only `size_t size` and `char *copy` in `_PyMem_RawStrdup()`; initialization remains after the assert. Assert, `strlen`, allocation, NULL handling, `memcpy`, and return order are unchanged. `_PyMem_Strdup()` and all later obmalloc diagnostics were left untouched.

Exact verification:

- Pre-change forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/cron-current/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2; `total=101 compiled=100 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First stable diagnostics: C2143 at `obmalloc.c(697-698)`, then C2065 cascades for `copy` and `size`. Full output: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1791263672-508466-3950.log`.
- TDD baseline focused test: `python3 scripts/vc6-obmalloc-rawwcsdup-c89.test.py cpython/Objects/obmalloc.c` — exit 0 before strengthening the test; the existing RawWcsdup C89 copy/empty/allocation-failure/overflow checks passed.
- TDD RED: same focused test after adding the RawStrdup assertion and before the production edit — exit 1, expected assertion `_PyMem_RawStrdup must use C89 declarations and preserve operation order`.
- TDD GREEN and focused regressions: `python3 scripts/vc6-obmalloc-rawwcsdup-c89.test.py cpython/Objects/obmalloc.c && python3 scripts/vc6-obmalloc-setup-allocators-c89.test.py cpython/Objects/obmalloc.c && python3 scripts/vc6-obmalloc-default-allocator-c89.test.py cpython/Objects/obmalloc.c && python3 scripts/vc6-obmalloc-tracemalloc-init-c89.test.py cpython/Objects/obmalloc.c cpython/Include/internal/pycore_pymem.h` — exit 0; all four passed.
- Applicable regression harness: `bash scripts/vc6-probe-pythoncore-frontier.test.sh` — exit 1. The new and other obmalloc checks passed. Two known unrelated failures remain: console type detection/cleanup order, and numeric dispatch (`ValueError: substring not found`). No suite-wide pass claimed.
- Post-change forced-fresh probe (same command as pre-change) — exit 2; `total=101 compiled=100 cached=0 skipped=0`. The former RawStrdup diagnostics at lines 697-699 are gone. First remaining diagnostics are C2143 at `obmalloc.c(713-714)`, followed by undeclared `copy`/`size` cascades in the separate `_PyMem_Strdup()` helper; distinct later obmalloc diagnostics remain untouched. Full output: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1791264091-508466-5e00.log`.
- Scoped `git diff --check -- scripts/vc6-obmalloc-rawwcsdup-c89.test.py`, `git -C cpython diff --check -- Objects/obmalloc.c`, and CPython exact tag/commit checks — exit 0.

Files changed in this slice: `cpython/Objects/obmalloc.c`, `scripts/vc6-obmalloc-rawwcsdup-c89.test.py`, and this status entry. The outer worktree and detached CPython checkout retain their prior dirty/untracked state. This remains compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next frontier: freshly re-probe before edits, then use one TDD slice on only `_PyMem_Strdup()`'s C89 declaration family at `obmalloc.c(713-714)`; leave the later allocator-map/API diagnostics separate.

---
## Latest run (`allocate_from_new_pool` pool declaration hoisted; frontier advances)

Date: 2026-10-07 09:56 UTC

Read `PORT_STATUS.md`, `README.md`, and the CPython Win9x/MSVC6 reference before acting. Preserved all existing outer and detached CPython work; no reset, clean, stash, discard, commit, push, publication, or patch regeneration. CPython remains at exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

Re-probed the recorded `poolp next` frontier before editing. It had already been fixed locally: the current first blocker was the separate late initialized `poolp pool = usable_arenas->freepools` declaration in `allocate_from_new_pool()`. Used one focused Codex CLI lane (`codex-cli 0.153.4`, OpenAI provider, workspace-write, ephemeral; session `01a115c5-019c-76d0-ba38-5934bc3d03d6`) after native delegation failed because the Anthropic package is unavailable and lazy installs are disabled. The lane extended the existing pool-extend test, ran the focused test RED before production edit, then hoisted only `poolp pool` to function entry. The assignment remains after the arena-list updates at its original execution point. Existing early returns, allocator list operations, and subsequent pool initialization remain unchanged. `pymalloc_pool_extend()` and the distinct subsequent blockers were not altered.

Exact verification:

- Pre-change forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/cron-current/runtime-confirm" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — probe exit 2; `total=101 compiled=100 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First stable diagnostics: C2275/C2146/C2065 at `obmalloc.c(1889)` on `poolp pool`; following pointer errors are cascades. Log: `build/cron-current/cron-reprobe-current.log`.
- TDD RED: `python3 scripts/vc6-obmalloc-pool-extend-c89.test.py cpython/Objects/obmalloc.c` — exit 1; expected assertion that `allocate_from_new_pool` must declare `pool` without an initializer at function entry. The prior `pymalloc_pool_extend` assertion passed.
- Focused GREEN and eight applicable obmalloc tests: `python3 scripts/vc6-obmalloc-pool-extend-c89.test.py cpython/Objects/obmalloc.c && python3 scripts/vc6-obmalloc-arena-map-mark-used-c89.test.py cpython/Objects/obmalloc.c && python3 scripts/vc6-obmalloc-arena-map-is-used-c89.test.py cpython/Objects/obmalloc.c && python3 scripts/vc6-obmalloc-allocator-name-c89.test.py cpython/Objects/obmalloc.c && python3 scripts/vc6-obmalloc-default-allocator-c89.test.py cpython/Objects/obmalloc.c && python3 scripts/vc6-obmalloc-rawwcsdup-c89.test.py cpython/Objects/obmalloc.c && python3 scripts/vc6-obmalloc-setup-allocators-c89.test.py cpython/Objects/obmalloc.c && python3 scripts/vc6-obmalloc-tracemalloc-init-c89.test.py cpython/Objects/obmalloc.c cpython/Include/internal/pycore_pymem.h` — exit 0; all checks passed. The RawWcsdup test includes C89 compile/runtime checks.
- Applicable regression harness: `bash scripts/vc6-probe-pythoncore-frontier.test.sh` — exit 1; existing console type-detection/cleanup-order assertion and numeric-dispatch `ValueError: substring not found` remain. No harness-wide pass claimed.
- Post-change forced-fresh probe (same options, runtime `build/cron-current/runtime-post`) — probe exit 2; `total=101 compiled=100 cached=0 skipped=0`; the former `poolp pool` diagnostics are gone. First remaining diagnostics now occur later in `obmalloc.c` at lines 1947-1952 (`block bp`, then `poolp next` in a separate function); further C89 declaration/type blockers follow. Log: `build/cron-current/post-pool-entry.log`.
- `git diff --check` and `git -C cpython diff --check -- Objects/obmalloc.c` — exit 0. Exact baseline tag/commit remain unchanged.

Files changed by this slice: `cpython/Objects/obmalloc.c`, extended `scripts/vc6-obmalloc-pool-extend-c89.test.py`, and this status entry. Compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next: freshly probe before edits and address only the first current blocker in the next function in `obmalloc.c` (currently `block *bp` at line 1947), with its own TDD slice. Do not claim port completion.

---
## Latest run (`_PyObject_Calloc` locals hoisted for VC6; frontier advances)

Date: 2026-10-07 UTC

Read `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved all pre-existing outer and detached CPython work; no reset, clean, stash, discard, commit, push, publication, or patch regeneration. CPython remains exactly at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded `_PyObject_Calloc()` frontier was freshly confirmed before edits with a forced-fresh MSVC600/Wine source-list probe. `_blake2/blake2s_impl.c` compiled; first stable diagnostics were C2143 at `obmalloc.c(2059)` and `(2061)` on the late initialized `nbytes` and `ptr`, followed by C2065 cascades at `(2062-2063)`. Hermes coding-subagent dispatch failed before startup because the Anthropic package is unavailable and lazy installs are disabled. One focused Codex CLI lane (`codex-cli 0.153.4`, OpenAI provider, workspace-write, ephemeral; session `01a11735-95ee-78b1-ac52-9aef9b07138e`) followed TDD: it added `scripts/vc6-obmalloc-calloc-c89.test.py`, verified the expected RED before changing production code, then hoisted only `size_t nbytes` and `void* ptr` to function entry and retained both assignments after the original assertion/calculation points. The assertion, allocation and zeroing behavior, fallback, accounting and return order are preserved. No neighboring function or later blocker was changed.

Exact verification:

- Before-change forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/cron-current/runtime-recheck" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-current/cron-reprobe-current.log 2>&1` — actual probe exit 2; `total=101 compiled=100 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First diagnostics C2143 at `obmalloc.c(2059)` and `(2061)`; C2065 `ptr` and `nbytes` at `(2062-2063)`. Capture: `build/cron-current/cron-reprobe-current.log`.
- TDD RED: `python3 scripts/vc6-obmalloc-calloc-c89.test.py cpython/Objects/obmalloc.c` — exit 1 before production edit with expected assertion `_PyObject_Calloc must declare nbytes and ptr without initializers at function entry`.
- TDD GREEN and focused test: same command — exit 0, `_PyObject_Calloc nbytes/ptr entry declarations and original operation order: PASS`.
- Applicable obmalloc regression suite: the new calloc test plus allocator-name, arena-map-is-used, arena-map-mark-used, default-allocator, pool-extend, RawWcsdup/allocated-blocks, setup-allocators, and tracemalloc-init tests — all exit 0. Exact commands and output were independently rerun; tracemalloc used the required header `cpython/Include/internal/pycore_pymem.h`. The Codex lane's first broad-loop invocation exited 1 because it omitted that required header; corrected invocations passed. Two erroneous header-path attempts also failed with FileNotFoundError and are not test passes.
- Post-change forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/cron-current/runtime-post-calloc" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-current/post-calloc.log 2>&1` — actual probe exit 2; `total=101 compiled=100 cached=0 skipped=0`. The former `_PyObject_Calloc()` diagnostics are gone. The first remaining diagnostic is C2143 at `obmalloc.c(2083)` for the late `uint size` in `insert_to_usedpool()`, followed by related late `poolp next`/`prev` errors at `(2084-2085)`; later errors are cascades or distinct functions and untouched.
- `git -C cpython diff --check -- Objects/obmalloc.c` and `git diff --check -- scripts/vc6-obmalloc-calloc-c89.test.py` — exit 0. Exact CPython tag/commit unchanged.

Files changed by this slice: `cpython/Objects/obmalloc.c`, new `scripts/vc6-obmalloc-calloc-c89.test.py`, and this status entry. Compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next: fresh forced-fresh probe before any edits; if the first blocker remains `insert_to_usedpool()` at line 2083, handle only that declaration family in a separate TDD slice. Do not claim port completion.

---
## Latest run (fresh probe confirms `pymalloc_free`; coding lane unavailable)

Date: 2026-10-07 23:10 UTC

Read `PORT_STATUS.md`, `README.md`, and the CPython Win9x/MSVC6 reference before acting. Preserved all existing outer and detached CPython work; no reset, clean, stash, discard, commit, push, publication, or patch regeneration. CPython remains at exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded `insert_to_freepool()` state was freshly re-probed. `_blake2/blake2s_impl.c` compiled, as did 99 source-list entries total; the first stable blocker has advanced to `pymalloc_free()` at `cpython/Objects/obmalloc.c(2286)`, C2143 before the late `pool` declaration and C2065 `pool` at 2287. Later diagnostics include `lastfree` and downstream allocator functions; they are distinct and untouched. One focused coding-subagent attempt was required but failed before startup because the Anthropic package is unavailable and lazy installs are disabled. Therefore this was diagnostics-only; no code or regression test changed.

Exact verification:

- Read-only discovery: `git status --short --branch` — exit 0; existing dirty/untracked files retained.
- Forced-fresh MSVC600/Wine probe: `XDG_RUNTIME_DIR="$PWD/build/cron-current/runtime-this-run" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2; `total=101 compiled=100 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First stable diagnostics: C2143 at `obmalloc.c(2286)`, C2065 `pool` at `(2287)`. Full capture: `/home/ubuntu/.hermes/profiles/maxwell/cache/terminal-output/out-1791414381-1200760-2b10.log`.
- Coding delegation for the one focused `pymalloc_free()` TDD slice — failed before child startup: Anthropic package missing; lazy installs disabled. No edits made by child.
- Applicable obmalloc regressions: chained all 11 `scripts/vc6-obmalloc-*.test.py` currently present, supplying `cpython/Objects/obmalloc.c` and `cpython/Include/internal/pycore_pymem.h` where required — exit 0; all 13 individual checks printed PASS (the pool-extend test covers three functions).
- `git -C cpython describe --tags --exact-match HEAD` → `v3.11.16`; `git -C cpython rev-parse HEAD` → `41388c9cb160d0886d5ca00d2e6c8782608a4549`. Scoped `git -C cpython diff --check -- Objects/obmalloc.c` and `git diff --check -- PORT_STATUS.md` — exit 0.

Files changed this run: `PORT_STATUS.md` only. Compiler-probe progress only; no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next: retry a single focused TDD coding lane for only the confirmed `pymalloc_free()` declaration family when delegation is available. Do not claim port completion.

---
## Latest run (`pymalloc_free` C89 declarations hoisted; next blocker confirmed)

Date: 2026-10-08 01:22 UTC

Read `PORT_STATUS.md`, `README.md`, and the CPython Win9x/MSVC6 reference before acting. Preserved all pre-existing outer and detached CPython work; no reset, clean, stash, discard, commit, push, publication, or patch regeneration. CPython remains at exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded `pymalloc_free()` frontier was freshly confirmed with forced-fresh MSVC600/Wine compilation: `obmalloc.c(2286)` C2143 before the late `pool` declaration, then C2065 `pool` at 2287. One focused Codex CLI lane (`codex-cli 0.153.4`, OpenAI provider, workspace-write, ephemeral; session `01a11915-6dd9-7242-b525-60e23eef616f`) followed strict TDD. It added `scripts/vc6-obmalloc-pymalloc-free-c89.test.py`, observed expected RED before production edits, then hoisted only `poolp pool` and `block *lastfree` into the function-entry declaration block. Assignments remain at their original evaluation points after the Valgrind early-return and address-range/refcount checks. No control flow or pointer updates were changed. All pre-existing local changes were preserved; the coding lane did not edit this status file.

Exact verification:

- Pre-change forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/cron-current/runtime-cron" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-current/cron-frontier-reprobe.log 2>&1` — probe exit 2; `total=101 compiled=100 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First stable diagnostics were C2143 at `obmalloc.c(2286)` and C2065 `pool` at `(2287)`.
- TDD RED: `python3 scripts/vc6-obmalloc-pymalloc-free-c89.test.py cpython/Objects/obmalloc.c` — exit 1 before production edits; expected assertion that `pool` and `lastfree` must be declared at function entry.
- TDD GREEN: same command after edit — exit 0; entry declarations and the function's full relevant evaluation/control-flow sequence passed.
- Focused obmalloc regression batch (all 12 `scripts/vc6-obmalloc-*.test.py`, with `cpython/Include/internal/pycore_pymem.h` supplied to the tracemalloc test) — exit 0; independently rerun by Hermes. All 12 test scripts exited 0; the pool-extend test validates three functions. RawWcsdup additionally passed its C89 compile/runtime checks.
- Post-change forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/cron-current/runtime-post-pymalloc-free" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-current/post-pymalloc-free.log 2>&1` — probe exit 2; `total=101 compiled=100 cached=0 skipped=0`. The former `pymalloc_free()` diagnostics at 2286-2299 are gone. First remaining stable diagnostics are in later allocator/debug functions: C2275/C2065 at `obmalloc.c(2628-2630)` around `debug_alloc_api_t api`, `uint8_t q`, and `size_t nbytes`; subsequent diagnostics include other distinct debug allocator functions and allocator-statistics C89 declarations. Left untouched.
- Scoped `git diff --check -- scripts/vc6-obmalloc-pymalloc-free-c89.test.py` and `git -C cpython diff --check -- Objects/obmalloc.c` — exit 0. Nested CPython baseline verified unchanged: tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

Files changed by this slice: `cpython/Objects/obmalloc.c`, new `scripts/vc6-obmalloc-pymalloc-free-c89.test.py`, and this status entry. Compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next: fresh forced-fresh probe before any new edit; if the recorded post-change frontier remains current, isolate only the first `debug_alloc_api_t api` C89 declaration family with its own TDD slice. Do not claim port completion.

---
## Latest run (fresh `mutablemapping_update()` probe; coding lane unavailable)

Date: 2026-10-09 11:46 UTC

Read `PORT_STATUS.md` and `README.md` before acting. The requested legacy-toolchain reference `references/python-3-win9x-msvc6.md` is absent from the project checkout and could not be located under `/home/ubuntu`; no claims rely on its contents. Preserved all existing outer and detached CPython work; no reset, clean, stash, discard, commit, push, publication, or patch regeneration. Exact CPython baseline remains tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The previously recorded `_blake2/blake2s_impl.c` / `mutablemapping_update()` frontier was freshly confirmed before any edit using the forced-fresh MSVC600/Wine source-list probe. `_blake2/blake2s_impl.c` compiled. First stable blocker remains the late `Py_ssize_t len` declaration at `Objects/odictobject.c(2299)`, followed by C2065 for `len` at `(2300)`. One focused coding-agent delegation was attempted for this precise defect family with TDD/preservation constraints, but failed before child startup because the Anthropic package is missing and lazy installs are disabled. Per the coding-agent delegation workflow, no direct substitute implementation was made. No source or tests were changed; diagnostics-only.

Exact verification:

- `XDG_RUNTIME_DIR="$PWD/build/cron-20261009-current/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261009-current/pre-change-probe.log 2>&1` — actual probe exit 2; summary `total=102 compiled=101 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First stable diagnostics: C2143 at `Objects/odictobject.c(2299)` and C2065 `len` at `(2300)`. Capture: `build/cron-20261009-current/pre-change-probe.log`.
- Focused coding-agent delegation for only the confirmed `len` declaration family — failed before child startup: missing `anthropic` package; lazy installs disabled. No child edits occurred.
- `git -C cpython describe --tags --exact-match HEAD` → `v3.11.16`; `git -C cpython rev-parse HEAD` → `41388c9cb160d0886d5ca00d2e6c8782608a4549`. Scoped `git diff --check -- PORT_STATUS.md` and `git -C cpython diff --check -- Objects/odictobject.c` exited 0.
- No source/test regressions were run because neither source nor tests changed. No standalone compiler banner was captured. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution was produced.

Files changed this run: `PORT_STATUS.md` only. This is compiler-probe progress only. Next frontier remains the late `Py_ssize_t len` declaration in `mutablemapping_update()`; retry the same narrow TDD slice when a coding agent can start. Do not claim port completion.

---
## Latest run (`picklebuf_as_buffer` designated initializer; frontier advances)

Date: 2026-10-09 18:23 UTC

Read `PORT_STATUS.md`, `README.md`, and `references/python-3-win9x-msvc6.md` before acting. Preserved existing outer and detached CPython changes; no reset, clean, stash, discard, commit, push, publication, or patch regeneration. CPython baseline remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded `picklebuf_raw()` declaration family was already resolved in the preserved local state. A forced-fresh MSVC600/Wine source-list probe reconfirmed the current first blocker as C2059 at `Objects/picklebufobject.c(142)` on `.bf_getbuffer`; the distinct designated initializer at line 211 was also reported and left untouched. Native Hermes coding delegation failed before startup because the Anthropic package is unavailable and lazy installs are disabled. One focused Codex CLI lane (`codex-cli 0.153.4`, OpenAI provider, workspace-write, ephemeral; session `01a121e2-95d9-7f21-96b3-6a70b3c7c102`) performed strict TDD. It added a focused C89 compile/runtime test that extracts the exact `PyBufferProcs` initializer, checks the actual header field order and both semantic mappings, and observed expected RED before the source edit. Only the two initializer entries were changed to positional initializers with field-name comments; `bf_getbuffer` and `bf_releasebuffer` mappings are preserved. The existing `picklebuf_raw()` test and all other pre-existing dirty/untracked files were byte-identical after the lane.

Exact verification:

- Pre-change forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/cron-20261009Tcurrent/runtime-20261009T1610" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261009Tcurrent/reprobe-20261009T1610.log 2>&1` — actual probe exit 2; summary `total=103 compiled=102 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First blocker C2059 at `picklebufobject.c(142)`; separate C2059 at `(211)`. Captured in `build/cron-20261009Tcurrent/reprobe-20261009T1610.log`.
- TDD RED: `python3 scripts/vc6-picklebuf-buffer-c89.test.py cpython/Objects/picklebufobject.c` — exit 1 before production edit; expected host C90 diagnostics on both designated entries (`ISO C90 forbids specifying subobject to initialize`). GREEN: same command after edit — exit 0, `picklebuf_as_buffer C89 compile and both semantic field mappings: PASS`.
- Applicable picklebuf regressions: `python3 scripts/vc6-picklebuf-buffer-c89.test.py cpython/Objects/picklebufobject.c && python3 scripts/vc6-picklebuf-raw-c89.test.py cpython/Objects/picklebufobject.c` — exit 0; raw regression reports five validation/allocation-order cases passed.
- Post-change forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/cron-20261009Tcurrent/runtime-post-20261009T1620" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261009Tcurrent/probe-post-picklebuf-buffer.log 2>&1` — actual probe exit 2; summary remains `total=103 compiled=102 cached=0 skipped=0`. `_blake2/blake2s_impl.c` and `Objects/picklebufobject.c` compile past the changed initializer. Previous line-142 C2059 is gone; first remaining blocker is C2059 at line 211 (`PyPickleBuffer_Type` designated initializer), intentionally untouched. Capture: `build/cron-20261009Tcurrent/probe-post-picklebuf-buffer.log`.
- `git -C cpython diff --check -- Objects/picklebufobject.c` and `git diff --check -- scripts/vc6-picklebuf-buffer-c89.test.py` — exit 0. CPython exact tag/commit unchanged. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution was produced.

Files changed by this slice: `cpython/Objects/picklebufobject.c` (only the two `picklebuf_as_buffer` entries), new `scripts/vc6-picklebuf-buffer-c89.test.py`, and this status entry. This is compiler-probe progress only, not a completed interpreter port. Next: force-fresh probe before edits, then isolate only the remaining first blocker, `PyPickleBuffer_Type` designated initialization at line 211, in a separate TDD slice. Do not claim port completion.

---
## Latest run (`set_table_resize()` C89 local declaration; frontier advances)

Date: 2026-10-10 UTC

Read this status, `README.md`, and the CPython Win9x/MSVC6 reference before acting. Preserved all pre-existing outer and detached CPython work; no reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. CPython remains at exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded frontier was freshly forced-reprobed before editing. `_blake2/blake2s_impl.c` and `Objects/rangeobject.c` compiled; first stable blocker was `Objects/setobject.c(244)` C2143 at the late initialized `size_t newsize`, followed by C2065 `newsize` at line 245. A focused coding-subagent dispatch was attempted as required but failed before startup because the Anthropic package is unavailable and lazy installs are disabled. No child changes occurred. Implemented one narrow test-first slice locally: added a regression asserting that `newsize` is declared in the function declaration block and initialized at its original location after the assertion, then ran it RED before changing production. Moved only the declaration to the entry declarations and retained initialization/evaluation order.

Exact verification:

- Before-change forced-fresh command: `XDG_RUNTIME_DIR="$PWD/build/cron-20261010T071759Z-reprobe/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261010T071759Z-reprobe/probe.log 2>&1` — actual probe exit 2; `total=105 compiled=104 cached=0 skipped=0`; `_blake2/blake2s_impl.c` and `Objects/rangeobject.c` compiled. First stable errors: C2143 at `setobject.c(244)`, C2065 `newsize` at `(245)`. Capture: `build/cron-20261010T071759Z-reprobe/probe.log`.
- Coding subagent — failed before startup: missing `anthropic` package; lazy installs disabled. No child edits.
- TDD RED: `python3 scripts/vc6-setobject-table-resize-c89.test.py cpython/Objects/setobject.c` before source edit — exit 1, expected assertion that `newsize` must be declared without initializer in the declaration block.
- Focused GREEN: same command after edit — exit 0, `set_table_resize C89 declaration and sizing order: PASS`.
- Post-change forced-fresh command: `XDG_RUNTIME_DIR="$PWD/build/cron-20261010T072321Z-post/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261010T072321Z-post/probe.log 2>&1` — actual probe exit 2; `total=105 compiled=104 cached=0 skipped=0`; `_blake2/blake2s_impl.c` and `Objects/setobject.c` compiled. The prior line-244/245 diagnostics are gone. First stable blocker advances within `setobject.c` to C2275/C2065 at line 779 (`PyObject *list`); later independent blockers remain at lines 956, 1033, 1038, 1778, 2017, 2179, and 2280. Capture: `build/cron-20261010T072321Z-post/probe.log`.
- Scoped `git -C cpython diff --check -- Objects/setobject.c` and outer `git diff --check -- scripts/vc6-setobject-table-resize-c89.test.py` — exit 0. Exact nested CPython tag/commit verified unchanged.

Files changed by this slice: `cpython/Objects/setobject.c` (only declaration/assignment split in `set_table_resize()`), new `scripts/vc6-setobject-table-resize-c89.test.py`, and this status entry. Compiler-probe progress only: no linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next: forced-fresh probe before any further edit; if unchanged frontier state, isolate only the first blocker at `setobject.c(779)` using a focused TDD slice. Do not claim port completion.

---
## Latest run (set iterator frontier confirmed; coding lane unavailable)

Date: 2026-10-10 09:28 UTC

Read `PORT_STATUS.md`, `README.md`, and the CPython Win9x/MSVC6 reference before acting. Preserved all existing outer and detached CPython changes; no reset, clean, stash, discard, commit, push, publication, or patch regeneration. CPython remains at exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`. Initial worktree inventory showed 36 outer and 126 nested dirty/untracked paths; all were left intact.

The previously recorded setobject frontier was stale and was freshly checked with forced-fresh MSVC600/Wine compilation. `_blake2/blake2s_impl.c` compiled. The first stable blocker is `setiter_reduce()` in `Objects/setobject.c`: C2275 at line 779 for late `PyObject *list`, followed by C2065 `list` at the same line. Later independent diagnostics at lines 956, 1033, 1038, 1778, 2017, 2179, and 2280 are untouched. One focused coding-subagent lane was attempted for only this first blocker with preservation/TDD constraints, but failed before startup because the Anthropic package is unavailable and lazy installs are disabled. No production or test source was changed; no RED/GREEN or regression pass is claimed. This run is diagnostics-only.

Exact verification:

- `XDG_RUNTIME_DIR="$PWD/build/cron-20261010T092855Z/runtime-reprobe" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261010T092855Z/probe-before.log 2>&1` — actual probe exit 2; summary `total=105 compiled=104 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First diagnostics: C2275 `PyObject` and C2065 `list` at `Objects/setobject.c(779)`. Capture: `build/cron-20261010T092855Z/probe-before.log`.
- Focused coding-agent delegation for exactly `setiter_reduce()`'s first C89 declaration blocker — failed before child startup: required `anthropic` package missing; lazy installs disabled. No child edits were applied.
- `git -C cpython describe --tags --exact-match HEAD` → `v3.11.16`; `git -C cpython rev-parse HEAD` → `41388c9cb160d0886d5ca00d2e6c8782608a4549`. No source/test regression suite was run because no source or test changed.
- No standalone compiler banner was captured. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution was produced.

Files changed this run: `PORT_STATUS.md` only. Compiler-probe progress only; no port completion is claimed. Next: retry one focused TDD implementation lane for the confirmed `setiter_reduce()` declaration at line 779 when a coding provider can start; keep `PySequence_List()` after the incref and preserve the decref/error order. Then force-fresh probe again. Do not claim port completion.

---
## Latest run (`frozenset_vectorcall()` C89 declarations; frontier advances)

Date: 2026-10-10 UTC

Read `PORT_STATUS.md`, `README.md`, and the CPython Win9x/MSVC6 reference before acting. CPython baseline remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`. Preserved all pre-existing dirty and untracked content; no reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. The recorded `_blake2/blake2s_impl.c` compilation was freshly confirmed, but the recorded next frontier required reprobe: the actual first stable blocker was `frozenset_vectorcall()` in `Objects/setobject.c`, not the separately compiled blake2 source.

One focused Codex CLI lane (`codex-cli 0.153.4`, one-shot `codex exec`, workspace-write) followed strict TDD. The Hermes delegation API attempt did not start because the Anthropic package is absent and lazy installation is disabled; the available Codex CLI was used instead. The lane added `scripts/vc6-setobject-frozenset-vectorcall-c89.test.py`, observed expected RED before production changes (the entry declaration assertion failed), and then moved only `nargs` and `iterable` declarations to the function's initial declaration block. Their assignments remain at their original evaluation points after the keyword and positional checks. The lane's exact-source snapshot check reports all pre-existing dirty/untracked contents, both indexes, and `PORT_STATUS.md` unchanged apart from the authorized source/test edits. No unrelated source was changed.

Exact verification:

- Before-change forced-fresh command: `XDG_RUNTIME_DIR="$PWD/build/cron-20261010T155705Z-blake2-frontier/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261010T155705Z-blake2-frontier/probe-before.log 2>&1` — actual probe exit 2; `total=105 compiled=104 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First stable diagnostics: C2275/C2146/C2065 at `Objects/setobject.c(1034)` for `nargs`; then C2275/C2065 at `(1039)` for `iterable`. Further distinct diagnostics at lines 1779, 2018, 2180, and 2281. Capture: `build/cron-20261010T155705Z-blake2-frontier/probe-before.log`.
- TDD RED/GREEN and applicable regressions, as run by the coding lane: new `vc6-setobject-frozenset-vectorcall-c89.test.py` failed before edit with the expected initial-declaration assertion, then passed after edit. All four `scripts/*setobject*.test.py` tests passed; output explicitly includes `setiter_reduce` (8 cases) and `set_table_resize` PASS. `git diff --check` and `git -C cpython diff --check` passed. No regression failure reported.
- Post-change forced-fresh command: same probe with `XDG_RUNTIME_DIR="$PWD/build/cron-20261010T155705Z-blake2-frontier/runtime-post"`, output to `build/cron-20261010T155705Z-blake2-frontier/probe-after.log` — actual probe exit 2; `total=105 compiled=104 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. The former diagnostics at lines 1034/1039 are gone and `setobject.c` compiles past `frozenset_vectorcall()`. First remaining stable errors advance to C2275/C2065/C2100 at `Objects/setobject.c(1782)` (`key`/`it`); later blockers remain at lines 2021, 2183, and 2284. Capture: `build/cron-20261010T155705Z-blake2-frontier/probe-after.log`.
- CPython tag/commit checked before change and unchanged. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified.

Files changed by this slice: `cpython/Objects/setobject.c` (only declarations/assignments in `frozenset_vectorcall()`), new `scripts/vc6-setobject-frozenset-vectorcall-c89.test.py`, and this status entry. This is compiler-probe progress only, not a completed port. Next: force-fresh reprobe before editing; if confirmed, isolate only the first current `setobject.c` blocker around line 1782 in a separate TDD slice.

---
## Latest run (`set_vectorcall()` `nargs` declaration hoisted; frontier advances)

Date: 2026-10-11 00:33 UTC

Read `PORT_STATUS.md`, `README.md`, and attempted the applicable CPython Win9x/MSVC6 reference before acting. The reference path available from the invoked skill is absent in this runtime; other searches did not find a local copy. Preserved all pre-existing outer and detached CPython work; no reset, clean, stash, discard, commit, push, publication, or patch regeneration. CPython remains at exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded first blocker was freshly force-reprobed before editing using MSVC600 under Wine. `_blake2/blake2s_impl.c` compiled. The first stable diagnostics were at `Objects/setobject.c(2024)` in `set_vectorcall()`: C2275 `Py_ssize_t`, C2146 before `nargs`, and C2065 `nargs`. Later independent designated-initializer blockers were at lines 2186 and 2287. One focused Codex CLI lane (`codex-cli 0.153.4`, OpenAI provider, workspace-write, ephemeral; session `01a12865-1451-7021-a43e-bdb0c99330fc`) followed strict TDD. The new regression failed before production edits with the expected assertion that `nargs` must be declared before executable statements. The only production change hoisted `Py_ssize_t nargs;` into the function declaration block and moved its `PyVectorcall_NARGS(nargsf)` initializer to an assignment at its original evaluation point after keyword validation. Argument checks, branches, and return behavior are unchanged. Hash verification confirmed all 165 other pre-existing dirty/untracked files remained byte-for-byte unchanged; exact comparison confirmed only this intended slice in the already-dirty `setobject.c`.

Exact verification:

- Before-change forced-fresh command: `XDG_RUNTIME_DIR="$PWD/build/cron-20261011T003257Z/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261011T003257Z/probe-before.log 2>&1` — actual probe exit 2; summary `total=105 compiled=104 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First diagnostics: C2275/C2146/C2065 at `Objects/setobject.c(2024)`; later C2059 at lines 2186 and 2287. Capture: `build/cron-20261011T003257Z/probe-before.log`.
- TDD RED: `python3 scripts/vc6-setobject-vectorcall-c89.test.py cpython/Objects/setobject.c` before production edit — exit 1 with the expected missing-entry-declaration assertion.
- Focused GREEN and applicable setobject regressions: `python3 scripts/vc6-setobject-vectorcall-c89.test.py cpython/Objects/setobject.c` and `for test in scripts/*setobject*.test.py; do echo "$ python3 $test cpython/Objects/setobject.c"; python3 "$test" cpython/Objects/setobject.c || exit; done` — exit 0. All six setobject scripts passed, including the new declaration/evaluation-order check and existing frozenset-vectorcall, issuperset, make-new-set, setiter-reduce, and table-resize checks.
- Post-change forced-fresh command: `XDG_RUNTIME_DIR="$PWD/build/cron-20261011T003257Z/runtime-post" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261011T003257Z/probe-post.log 2>&1` — actual probe exit 2; summary `total=105 compiled=104 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. No diagnostics remain at `set_vectorcall()` line 2024. The next designated-initializer blockers are at `setobject.c` lines 2188 and 2289. Capture: `build/cron-20261011T003257Z/probe-post.log`.
- `git diff --check -- PORT_STATUS.md scripts/vc6-setobject-vectorcall-c89.test.py` and `git -C cpython diff --check -- Objects/setobject.c` — exit 0. `git -C cpython describe --tags --exact-match HEAD` → `v3.11.16`; `git -C cpython rev-parse HEAD` → `41388c9cb160d0886d5ca00d2e6c8782608a4549`.
- No standalone compiler banner was captured. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution was produced.

Files changed by this slice: `cpython/Objects/setobject.c` (only `set_vectorcall()` declaration/assignment split), new `scripts/vc6-setobject-vectorcall-c89.test.py`, and this status entry. Compiler-probe progress only, not a completed port. Next: force-fresh probe before editing; if unchanged, handle only the first designated initializer at `setobject.c(2188)` in its own TDD slice. Do not combine the later initializer at 2289 or claim a completed port.

---
## Latest run (fresh frontier confirmed; focused coding lane unavailable)

Date: 2026-10-11 02:49 UTC

Read `PORT_STATUS.md`, `README.md`, and the applicable CPython Win9x/MSVC6 reference before acting. Preserved all pre-existing outer and detached CPython work; no reset, clean, stash, discard, commit, push, publication, or patch regeneration. CPython remains at exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The previously recorded compiler frontier was force-reprobed under MSVC600/Wine before any edits. `_blake2/blake2s_impl.c` compiled. The logged `setobject.c(2024)` declaration blocker is no longer present; the actual first stable errors are C2059 at `Objects/setobject.c(2188)` on the designated `.tp_vectorcall` initializer in `PySet_Type`, followed by a distinct C2059 at line 2289 in `PyFrozenSet_Type`. A single focused coding-agent delegation was attempted for only the first initializer and strict TDD, but failed before child startup because the Anthropic package is unavailable and lazy installs are disabled. Therefore this run is diagnostics-only: no source/test implementation was attempted, no TDD RED/GREEN is claimed, and no production source was modified. Existing local changes remain preserved.

Exact verification:

- Forced-fresh command: `XDG_RUNTIME_DIR="$PWD/build/cron-20261011T-current/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261011T-current/probe.log 2>&1` — actual probe exit 2; summary `total=105 compiled=104 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First diagnostic C2059 at `Objects/setobject.c(2188)`; separate C2059 at `(2289)`. Capture: `build/cron-20261011T-current/probe.log`.
- Compiler banner independently captured using the MSVC600 environment batch under Wine: `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86` (VC6.0).
- Focused coding-agent delegation for only the line-2188 `PySet_Type` initializer failed before child startup: missing `anthropic` package; lazy installs disabled. No child edits occurred.
- All six applicable existing `scripts/vc6-setobject-*.test.py` regressions were run against `cpython/Objects/setobject.c`; each exited 0: frozenset vectorcall, issuperset, make-new-set, setiter-reduce, table-resize, and set-vectorcall.
- `git diff --check -- PORT_STATUS.md` and `git -C cpython diff --check -- Objects/setobject.c` — exit 0. Exact baseline tag/commit verified unchanged.
- No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution was produced.

Files changed this run: `PORT_STATUS.md` only. Compiler-probe progress only; no port completion is claimed. Next: retry one focused TDD coding lane for only the `PySet_Type` positional initializer at line 2188 when a coding provider can start; leave the separate `PyFrozenSet_Type` initializer at line 2289 untouched. Do not claim port completion.

---
## Latest run (fresh frontier confirmed; coding delegation unavailable)

Date: 2026-10-11 07:02 UTC

Read `PORT_STATUS.md`, `README.md`, and the CPython 3.11.16 Win9x/MSVC6 reference (`/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md`) before acting. Preserved all existing outer and detached CPython work; no reset, clean, stash, discard, commit, push, publication, or patch regeneration. CPython remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The prior status frontier was force-reprobed. `_blake2/blake2module.c`, `_blake2/blake2b_impl.c`, and `_blake2/blake2s_impl.c` all compiled, so the suggested `_blake2/blake2s_impl.c` sequence is no longer current. The first stable diagnostics are in `Objects/sliceobject.c` inside `PySlice_New()`: late declarations of `PyInterpreterState *interp` and `PySliceObject *obj` at lines 126-127 produce C2275/C2065, with subsequent member-access errors cascading. Separate later declaration families at lines 600, 608, and 617 remain out of scope. One focused coding-subagent attempt was made for only the first family, but failed before child startup because the Anthropic package is unavailable and lazy installs are disabled. Therefore this run is diagnostics-only: no TDD RED/GREEN, production edit, or regression pass is claimed.

Exact verification:

- `XDG_RUNTIME_DIR="$PWD/build/cron-20261011T070252Z/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261011T070252Z/probe.log 2>&1` — actual probe exit 2; summary `total=106 compiled=105 cached=0 skipped=0`. The three `_blake2` sources compiled. First diagnostics: `sliceobject.c(126)` C2275 `PyInterpreterState` / C2065 `interp`, `sliceobject.c(127)` C2275 `PySliceObject` / C2065 `obj`, then cascading C2223 errors at 128-130; additional distinct late-declaration errors remain at 141, 143, 145, 600, 608, and 617. Capture: `build/cron-20261011T070252Z/probe.log`.
- Focused coding delegation for only the `PySlice_New()` declaration family — failed before child startup: Anthropic package required; lazy installs disabled. No child edits occurred.
- Search for existing focused tests (`vc6-sliceobject-*.test.py`) found none. No source/test changes were made, so no regression suite was run.
- `git diff --check -- PORT_STATUS.md` and `git -C cpython diff --check -- Objects/sliceobject.c` — exit 0. Exact baseline tag/commit verified unchanged.
- No standalone compiler banner was captured. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution was produced.

Files changed this run: `PORT_STATUS.md` only. This is compiler-probe progress, not a completed port. Next: retry one focused TDD coding lane for only the two `PySlice_New()` declarations, preserving initializer evaluation at the original locations; do not edit the later sliceobject families or the already compiling `_blake2` sources.

---
## Latest run (`slice_richcompare()` C89 declaration family; compiler frontier advances)

Date: 2026-10-11 11:30 UTC

Read `PORT_STATUS.md`, `README.md`, and attempted to read the CPython Win9x/MSVC6 reference before acting; the reference path available in prior records was not present in this runtime. Preserved all pre-existing outer and detached CPython work; no reset, clean, stash, discard, commit, push, publication, or patch regeneration. Baseline remains exact CPython tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded `_blake2/blake2s_impl.c` state was force-reprobed before any source edit. `_blake2/blake2s_impl.c` compiled; the actual first blocker was `Objects/sliceobject.c:slice_richcompare()`, with VC6 C2275/C2065 diagnostics on late `PyObject *t1`, `*t2`, and `*res` declarations at lines 602, 610, and 619, followed by cascades. One focused Codex CLI lane (`codex-cli 0.153.4`, workspace-write/ephemeral; session `01a12ab5-68eb-7a70-a4b1-adfe714bd9be`) followed TDD. It added a focused regression first and observed the expected RED (`t1`, `t2`, `res` not declared at function entry), then hoisted only those declarations into the function declaration block. The tuple allocations, rich comparison assignment, error checks, decrefs, and return remain in their original order. The lane reported a focused compile attempt blocked before compilation by Wine's `/run/user/1000/wine/.../lock` read-only error; a parent-run forced-fresh full source-list probe subsequently compiled the edited sliceobject and advanced to `Objects/structseq.c`.

Exact verification:

- Before-change forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/cron-20261011Tcurrent-reprobe/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261011Tcurrent-reprobe/probe.log 2>&1` — actual probe exit 2; summary `total=106 compiled=105 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First diagnostics were C2275/C2065 at `sliceobject.c(602)` (`PyObject`/`t1`), `(610)` (`PyObject`/`t2`), and `(619)` (`PyObject`/`res`), with later cascades. Capture: `build/cron-20261011Tcurrent-reprobe/probe.log`.
- TDD RED: `python3 scripts/vc6-sliceobject-richcompare-c89.test.py` — exit 1 before production edit, expected assertion `slice_richcompare must declare t1, t2, res without initializers at function entry`.
- Focused GREEN and all directly applicable sliceobject regression tests: `python3 scripts/vc6-sliceobject-richcompare-c89.test.py cpython/Objects/sliceobject.c` and `for test in scripts/vc6-sliceobject-*.test.py; do python3 "$test" cpython/Objects/sliceobject.c || exit $?; done` — exit 0; both the richcompare and existing `PySlice_New()` regression pass. Scoped nested/outer `git diff --check` — exit 0.
- Post-change forced-fresh source-list probe: `XDG_RUNTIME_DIR="$PWD/build/cron-20261011Tcurrent-post/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261011Tcurrent-post/probe.log 2>&1` — actual probe exit 2; summary `total=107 compiled=106 cached=0 skipped=0`. `_blake2/blake2s_impl.c` and `Objects/sliceobject.c` compile; all prior sliceobject diagnostics are gone. First blocker advances to `Objects/structseq.c`, starting at line 58 (C2275/C2146/C2065 for `Py_ssize_t vsize`), with additional declaration and initializer errors later in that file. Capture: `build/cron-20261011Tcurrent-post/probe.log`.
- Exact tag/commit verified unchanged. No `pythoncore.dll`/`python.exe` link, Wine interpreter execution, or real Windows 98 SE execution was produced.

Files changed by this slice: `cpython/Objects/sliceobject.c` (only declarations/assignment forms in `slice_richcompare()`), new `scripts/vc6-sliceobject-richcompare-c89.test.py`, and this status entry. Compiler-probe progress only; no port completion is claimed. Next: force-fresh probe before editing and isolate only the first current `Objects/structseq.c` defect family with a focused TDD test. Do not infer the full file's fix from the initial diagnostic or conflate source compilation with linking/runtime acceptance.

---
## Latest run (`PyStructSequence_New()` C89 declaration; frontier advances)

Date: 2026-10-11 UTC

Read `PORT_STATUS.md`, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved all pre-existing outer and detached CPython changes; no reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. CPython baseline remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The previously recorded compiler frontier was not the current one: a forced-fresh VC6/Wine source-list probe confirmed `_blake2/blake2s_impl.c` compiles and the first blocker was `Objects/structseq.c(58)`, a late initialized declaration of `vsize` in `PyStructSequence_New()`. One focused Codex CLI lane (`codex-cli 0.153.4`, session `01a12b2e-4aca-76f2-878d-6937ceb60c69`, workspace-write/ephemeral) followed strict TDD. New regression `scripts/vc6-structseq-new-c89.test.py` failed before production edits as expected, asserting `vsize` must be declared at function entry. The only production edit declares `Py_ssize_t vsize;` before the early return and moves `VISIBLE_SIZE_TP(type)` evaluation to an assignment at its original point after the `size < 0` check. Allocation, error handling, and subsequent behavior were not changed. No pre-existing `vc6-structseq-*.test.py` existed. Later diagnostics in `structseq.c` were left untouched.

Exact verification:

- Before-change forced-fresh command: `XDG_RUNTIME_DIR="$PWD/build/cron-20261011T133200Z/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261011T133200Z/probe.log 2>&1` — actual probe exit 2; summary `total=107 compiled=106 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First stable diagnostics at `structseq.c(58)`: C2275 `Py_ssize_t`, C2146 before `vsize`, C2065 `vsize`; cascades followed. Capture: `build/cron-20261011T133200Z/probe.log`.
- TDD RED: `python3 scripts/vc6-structseq-new-c89.test.py cpython/Objects/structseq.c` before production edit — exit 1, expected assertion `vsize must be declared without initializer before the size < 0 check`.
- GREEN: same command after source edit — exit 0, `PyStructSequence_New C89 declaration and size lookup order: PASS`. No existing `vc6-structseq-*.test.py` regressions were present. Scoped `git diff --check -- PORT_STATUS.md scripts/vc6-structseq-new-c89.test.py` and `git -C cpython diff --check -- Objects/structseq.c` — exit 0.
- Post-change forced-fresh command: `XDG_RUNTIME_DIR="$PWD/build/cron-20261011T133200Z-post/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261011T133200Z-post/probe-post.log 2>&1` — actual probe exit 2; summary `total=107 compiled=106 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled; the previous diagnostics at line 58 are gone. First remaining diagnostics are now `structseq.c(95)` C2143 and cascades at `(96-97)` in `structseq_traverse()`. Further independent diagnostics remain at lines 109, 262, 271-294, 402-413, 582-589, and 616-618. Capture: `build/cron-20261011T133200Z-post/probe-post.log`.
- `git -C cpython describe --tags --exact-match HEAD` → `v3.11.16`; `git -C cpython rev-parse HEAD` → `41388c9cb160d0886d5ca00d2e6c8782608a4549`. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution was produced.

Files changed by this slice: `cpython/Objects/structseq.c` (only the `PyStructSequence_New()` declaration/assignment split), new `scripts/vc6-structseq-new-c89.test.py`, and this status entry. Compiler-probe progress only, not a completed port. Next: force-fresh probe before editing; if unchanged, isolate only the `structseq_traverse()` declaration blocker at line 95 in its own TDD slice.

---
## Latest run (`structseq_traverse()` C89 declaration; frontier advances)

Date: 2026-10-11 UTC

Read this status, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved all pre-existing outer and detached CPython work. No reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. CPython baseline remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded `_blake2`/slice frontier was force-reprobed first. The recorded state was stale: `_blake2/blake2s_impl.c` compiled, but the actual first blocker was `Objects/structseq.c` mixed declarations in `structseq_traverse()` and later functions. One focused Codex CLI lane (`codex-cli 0.153.4`, session `01a12ba6-de06-75e3-97dc-77f68c3f7ab7`, workspace-write/ephemeral) followed TDD for only the first declaration family. New test `scripts/vc6-structseq-traverse-c89.test.py` failed before production edits with the expected assertion on the late `Py_ssize_t i, size;`; the sole production edit hoisted that declaration before the heap-type visit. `size = REAL_SIZE(obj)` remains after the visit, preserving lookup/evaluation order. No other source location was edited. Snapshot verification confirmed all 173 pre-existing changed/untracked files remained byte-identical.

Exact verification:

- Before-change forced-fresh: `XDG_RUNTIME_DIR="$PWD/build/cron-20261011-blake2-check/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261011-blake2-check/probe.log 2>&1` — actual probe exit 2; summary `total=107 compiled=106 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First diagnostics in `structseq.c` were C2143 at line 95, then C2065 `size`/`i` at lines 96-97 and cascades; separate later declaration/initializer families followed. Capture: `build/cron-20261011-blake2-check/probe.log`.
- TDD RED: `python3 scripts/vc6-structseq-traverse-c89.test.py` — exit 1 before source edit, expected assertion that `i` and `size` must precede the heap-type check. GREEN: same command after edit — exit 0.
- Applicable regressions: `python3 scripts/vc6-structseq-traverse-c89.test.py` and `python3 scripts/vc6-structseq-new-c89.test.py` — exit 0. Outer and scoped nested `git diff --check` — exit 0.
- Post-change forced-fresh probe: same command with output `build/cron-20261011-blake2-check/probe-post.log` and runtime `build/cron-20261011-blake2-check/post-runtime` — actual probe exit 2; `total=107 compiled=106 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. The former traverse diagnostics at lines 95-97 are gone; the first remaining diagnostic family advances to `structseq_dealloc()` at line 109 (C2275 `PyTypeObject`, C2065 `tp`), followed by distinct later mixed-declaration and initializer errors. No separate compiler banner captured.
- The existing Codex snapshot comparison reported 173 pre-existing modified/untracked files preserved. Exact baseline tag/commit unchanged. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution was produced.

Files changed by this slice: `cpython/Objects/structseq.c` (one declaration move), new `scripts/vc6-structseq-traverse-c89.test.py`, and this status entry. This is compiler-probe progress only, not a completed port. Next: force-fresh probe before editing and isolate only the first current `structseq_dealloc()` declaration family at line 109 in its own TDD slice.

---
## Latest run (fresh probe moved first blocker to `structseq.c`; coding lane unavailable)

Date: 2026-10-11 UTC

Read `PORT_STATUS.md`, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved all pre-existing outer and detached CPython modifications; no reset, clean, stash, discard, commit, push, publication, or patch regeneration. CPython baseline remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The status-recorded `sliceobject.c` frontier was stale. A forced-fresh MSVC600/Wine source-list probe compiled `_blake2/blake2s_impl.c` and reported first stable errors in `Objects/structseq.c(109)`: C2275 (`PyTypeObject` illegal use as expression) and C2065 (`tp` undeclared) for the initialized declaration in `structseq_dealloc()`. Separate later mixed-declaration diagnostics occur at line 262; they are not part of this attempted first slice and remain untouched. A single focused coding-agent delegation was attempted, as required for implementation, but failed before child startup because the Anthropic package is unavailable and lazy installs are disabled. Thus this run is diagnostics-only: no TDD RED/GREEN cycle, source edit, or new regression is claimed. Existing applicable `structseq` regressions passed.

Exact verification:

- `XDG_RUNTIME_DIR="$PWD/build/cron-20261011-current/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261011-current/probe-before.log 2>&1` — probe exit 2; summary `total=107 compiled=106 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First stable diagnostics: `Objects/structseq.c(109)` C2275 `PyTypeObject` and C2065 `tp`; later separate C2143/C2065/C2059 diagnostics at line 262. Capture: `build/cron-20261011-current/probe-before.log`.
- Exact baseline checks: `git -C cpython describe --tags --exact-match HEAD` → `v3.11.16`; `git -C cpython rev-parse HEAD` → `41388c9cb160d0886d5ca00d2e6c8782608a4549`. `codex --version` → `codex-cli 0.153.4`; `codex login status` → logged in using ChatGPT. The focused `delegate_task` coding lane failed before startup with the Anthropic package/lazy-install error. No child edits occurred.
- `python3 scripts/vc6-structseq-new-c89.test.py cpython/Objects/structseq.c` — exit 0, `PyStructSequence_New C89 declaration and size lookup order: PASS`.
- `python3 scripts/vc6-structseq-traverse-c89.test.py cpython/Objects/structseq.c` — exit 0, `structseq_traverse C89 declarations and visit/size lookup order: PASS`.
- `git diff --check -- PORT_STATUS.md` and `git -C cpython diff --check -- Objects/structseq.c` — exit 0. No standalone MSVC compiler banner was captured. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution was produced.

Files changed this run: `PORT_STATUS.md` only. Compiler-probe progress only; no port completion is claimed. Next: use a working focused coding lane (Codex CLI is installed/authenticated, but the available native delegate backend failed before startup) for a strict TDD test of only the `structseq_dealloc()` declaration at line 109; preserve `tp = Py_TYPE(obj)` after `PyObject_GC_UnTrack(obj)`. Then rerun the forced-fresh probe to establish the next actual frontier. Do not touch the independent line-262 blocker in that slice.

---
## Latest run (`structseq_repr()` C89 loop declaration; frontier advances)

Date: 2026-10-11 UTC

Read `PORT_STATUS.md`, `README.md`, and the CPython 3.11.16 Win9x/MSVC6 reference before acting. Preserved all pre-existing outer and detached CPython work; no reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. CPython baseline remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The previous compiler frontier was re-probed with a forced-fresh MSVC600/Wine source-list run before editing. `_blake2/blake2s_impl.c` compiled. The first blocker was the C99 loop initializer declaration `for (Py_ssize_t i=0; ...)` in `Objects/structseq.c:structseq_repr()` at line 263. One focused Codex CLI lane (`codex-cli 0.153.4`, one-shot `codex exec`, workspace-write/ephemeral; logged in with ChatGPT) followed strict TDD. Its new `scripts/vc6-structseq-repr-c89.test.py` failed before the production edit with the expected assertion that the VC6-incompatible loop declaration remained. The only production change declares `Py_ssize_t i;` in the function declaration block and changes the loop initializer to `i=0`; the loop still starts after writing `(`, performs the same per-iteration visible-size check, and increments once per iteration. No other function or defect family changed. Independent scope verification confirmed the exact intended two-line production delta, with pre-existing changes and `PORT_STATUS.md` preserved by the lane.

Exact verification:

- Before-change forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/cron-20261011T221407Z-fresh/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261011T221407Z-fresh/probe-before.log 2>&1` — actual probe exit 2; summary `total=107 compiled=106 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First diagnostic family at `structseq.c(263)` was C2143 declaration/statement syntax diagnostics and C2065 `i`. Capture: `build/cron-20261011T221407Z-fresh/probe-before.log`.
- TDD RED: `python3 scripts/vc6-structseq-repr-c89.test.py` before production edit — exit 1, expected assertion `structseq_repr: VC6 rejects the C99 loop initializer declaration; declare i in the function declaration block`.
- TDD GREEN and all applicable structseq regressions: `python3 scripts/vc6-structseq-repr-c89.test.py` and `for test in scripts/vc6-structseq-*.test.py; do python3 "$test" || exit $?; done` — exit 0. All four structseq tests passed (`dealloc`, `new`, `repr`, `traverse`). `git -C cpython diff --check -- Objects/structseq.c` and `git diff --check -- scripts/vc6-structseq-repr-c89.test.py` — exit 0.
- Post-change forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/cron-20261011T221407Z-fresh/runtime-post" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261011T221407Z-fresh/probe-after.log 2>&1` — actual probe exit 2; summary remains `total=107 compiled=106 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. The former `structseq_repr()` line-263 diagnostics are gone; first remaining diagnostics now begin at line 273 (`C2143` before `const`, then C2065 `name_utf8`), followed by distinct late declaration families at lines 280, 294, 296, and 404 and designated initializer errors at 584-591. Capture: `build/cron-20261011T221407Z-fresh/probe-after.log`.
- CPython tag/commit remain unchanged. No `pythoncore.dll`/`python.exe` link, Wine interpreter execution, or real Windows 98 SE execution was produced.

Files changed by this slice: `cpython/Objects/structseq.c` (only `structseq_repr()` loop variable declaration/initializer), new `scripts/vc6-structseq-repr-c89.test.py`, and this status entry. This is compiler-probe progress only, not a completed port. Next: force-fresh probe before editing and isolate only the first actual remaining `structseq_repr()` declaration family at line 273; do not combine later declarations or initializer errors.

---
## Latest run (`tuple_alloc()` C89 declaration; frontier advances)

Date: 2026-10-12 15:53 UTC

Read `PORT_STATUS.md`, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved existing outer and detached CPython work; no reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. CPython baseline remains tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded tupleobject frontier was freshly force-reprobed. `_blake2/blake2s_impl.c` compiled. The current first errors were `Objects/tupleobject.c(43)` C2275 (`PyTupleObject`) and C2065 (`op`) on `PyTupleObject *op = maybe_freelist_pop(size);`. A native coding-subagent attempt failed before startup because `anthropic` is unavailable and lazy installs are disabled; the installed Codex CLI was then used as one focused coding lane. Strict TDD added `scripts/vc6-tupleobject-alloc-c89.test.py`; RED failed before the source edit on the expected declaration-placement assertion. The only source change declares `op` in `tuple_alloc()`'s initial declaration block and leaves `op = maybe_freelist_pop(size)` at its original point after size validation and the debug assertion. Regression verifies the full function's validation, freelist, overflow, allocation, error, and return order.

Exact verification:

- Before-change forced-fresh command: `mkdir -p build/cron-current-evidence/runtime && XDG_RUNTIME_DIR="$PWD/build/cron-current-evidence/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-current-evidence/probe.log 2>&1` — probe exit 2; summary `total=108 compiled=107 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First diagnostics: `tupleobject.c(43)` C2275/C2065. Full log: `build/cron-current-evidence/probe.log`.
- TDD RED: `python3 scripts/vc6-tupleobject-alloc-c89.test.py cpython/Objects/tupleobject.c` before the production change — exit 1, expected assertion that `op` must be declared before the size-check statement. GREEN: same command after edit — exit 0, `tuple_alloc C89 declaration and validation/allocation order: PASS`.
- Applicable tupleobject C89 regression set: one script exists, the new `vc6-tupleobject-alloc-c89.test.py`; focused run exited 0. `git -C cpython diff --check -- Objects/tupleobject.c` exited 0. Snapshot/hash verification confirmed previously dirty/untracked content, `PORT_STATUS.md` before its entry, and probe log were unchanged by the coding lane; the nested source has exactly the intended declaration/assignment split.
- Post-change forced-fresh command: `mkdir -p build/cron-current-evidence-post/runtime && XDG_RUNTIME_DIR="$PWD/build/cron-current-evidence-post/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-current-evidence-post/probe.log 2>&1` — probe exit 2; summary `total=108 compiled=107 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. Prior `tuple_alloc()` diagnostics at line 43 are gone. The next first stable diagnostics are in `tupleobject.c(80)` (C2143/C2065 for the loop declaration/`i`); later distinct diagnostics include lines 167, 207, and 219. These remain untouched. Full capture: `build/cron-current-evidence-post/probe.log`.
- CPython tag and commit verified unchanged. No standalone compiler banner, linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution was produced.

Files changed by this slice: `cpython/Objects/tupleobject.c` (one declaration/assignment split), new `scripts/vc6-tupleobject-alloc-c89.test.py`, and this status entry. This is compiler-probe progress only, not a completed port. Next frontier: force-fresh probe before edits; if unchanged, isolate only the current `tupleobject.c` loop-declaration blocker at line 80 in its own TDD slice. Do not conflate compiler progress with linked or target-runtime acceptance.

---
## Latest run (PyTuple_Pack frontier confirmed; coding lane unavailable)

Date: 2026-10-12 UTC

Read `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved all existing outer and detached CPython changes; no reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. CPython remains at exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded tupleobject frontier was freshly force-reprobed before any edits and remains current. `_blake2/blake2s_impl.c` compiled. First stable MSVC600/Wine diagnostics are in `Objects/tupleobject.c:PyTuple_Pack()` at line 168: C2275 (`PyTupleObject`) and C2065 (`result`) on the late initialized declaration, followed by cascading errors at lines 169 and 173. Later, distinct tupleobject blockers remain untouched. One focused coding-subagent delegation was attempted for this single defect family and strict TDD, but failed before child startup because the Hermes runtime requires the unavailable `anthropic` package and lazy installs are disabled. This run is therefore diagnostics-only: no production/test edits, TDD RED/GREEN cycle, or implementation regression is claimed.

Exact verification:

- Baseline: `git -C cpython describe --tags --exact-match HEAD` → `v3.11.16`; `git -C cpython rev-parse HEAD` → `41388c9cb160d0886d5ca00d2e6c8782608a4549`.
- Forced-fresh probe: `mkdir -p build/cron-20261012T-current/runtime && XDG_RUNTIME_DIR="$PWD/build/cron-20261012T-current/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261012T-current/probe-before.log 2>&1` — actual probe exit 2; summary `total=108 compiled=107 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First diagnostics: `tupleobject.c(168)` C2275/C2065 (`PyTupleObject` / `result`); subsequent cascades at `(169)` and `(173)`. Later independent diagnostics start at `(208)`. Full capture: `build/cron-20261012T-current/probe-before.log`.
- Focused coding-agent delegation for only the line-168 declaration — failed before startup: `anthropic` package unavailable; lazy installs disabled. No child edits or tests occurred.
- Existing applicable tupleobject tests: `for test in scripts/vc6-tupleobject-*.test.py; do python3 "$test"; ...; done` — exit 0. `vc6-tupleobject-alloc-c89.test.py` and `vc6-tupleobject-new-c89.test.py` each exited 0. `git -C cpython diff --check -- Objects/tupleobject.c` — exit 0.
- No standalone compiler banner, linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution was produced.

Files changed this run: `PORT_STATUS.md` only. Compiler-probe progress only; no port completion is claimed. Next: retry one focused TDD coding lane for the confirmed `PyTuple_Pack()` declaration at line 168 when a coding agent can start; leave subsequent tupleobject blockers untouched.

---
## Latest run (`PyTuple_Pack()` C89 declaration; frontier advances)

Date: 2026-10-12 22:27 UTC

Read `PORT_STATUS.md`, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved all existing root and detached CPython work. No reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. CPython remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

One focused coding-agent lane (Codex CLI 0.153.4, OpenAI, workspace-write/ephemeral; session `01a13235-805c-7691-8bb8-6f0ffaab93a8`) was used after the fresh probe confirmed the prior `PyTuple_Pack()` line-168 declaration blocker. TDD RED: new `scripts/vc6-tupleobject-pack-c89.test.py` failed before the source edit with the intended assertion that `result` must be declared in the function declaration block. The sole production change declares `PyTupleObject *result` with the other locals and changes the later initialized declaration to `result = tuple_alloc(n);` immediately after `va_start`. Allocation timing, empty-tuple path, error cleanup, item/refcount operations, GC tracking, and return order are preserved. Snapshot/hash comparison verified all 183 other pre-existing dirty/untracked files unchanged.

Exact verification:

- Before-change forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/cron-20261012T221714Z/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2; `_blake2/blake2s_impl.c` compiled; first diagnostics were `tupleobject.c(168)` C2275/C2065 (`PyTupleObject`/`result`), followed by C2223 at line 173. Full capture: `build/cron-20261012T221714Z/probe.log`.
- TDD RED: `python3 scripts/vc6-tupleobject-pack-c89.test.py` — exit 1 on the expected declaration-placement assertion, before production edit.
- GREEN and applicable regressions: `python3 scripts/vc6-tupleobject-alloc-c89.test.py`, `python3 scripts/vc6-tupleobject-new-c89.test.py`, and `python3 scripts/vc6-tupleobject-pack-c89.test.py` — all exit 0. Scoped `git diff --check` commands for `cpython/Objects/tupleobject.c` and the new test — exit 0.
- Post-change forced-fresh probe: `XDG_RUNTIME_DIR="$PWD/build/cron-20261012T-after-pack/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2; summary `total=108 compiled=107 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. Former line-168/173 diagnostics are gone. The first stable blocker is now `tupleobject.c(209)` C2143 followed by `(210)` C2065 `i` in the next function; later tupleobject blockers remain untouched. Full capture: `build/cron-20261012T-after-pack/probe.log`.
- Exact CPython tag and commit verified unchanged. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution was produced. This is compiler-probe progress only.

Files changed by this slice: `cpython/Objects/tupleobject.c` (only `PyTuple_Pack()` declaration split), new `scripts/vc6-tupleobject-pack-c89.test.py`, and this status entry. Next: force-fresh probe before changes, then address only the newly confirmed first blocker at `tupleobject.c(209-210)` in a separate TDD slice. No completed port is claimed.

---
## Latest run (forced-fresh tupleobject frontier; coding lane unavailable)

Date: 2026-10-13 00:33 UTC

Read `PORT_STATUS.md`, `README.md`, and the applicable CPython 3.11.16 Win9x/MSVC6 reference before acting. Preserved all pre-existing outer and detached CPython changes; no reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. The CPython baseline remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded frontier was not current, so it was force-reprobed before any implementation work. `_blake2/blake2s_impl.c` compiled successfully; the first stable blocker is now `Objects/tupleobject.c:tupledealloc()` at line 209, where `Py_ssize_t i = Py_SIZE(op);` follows statements and triggers C2143, followed by C2065 for `i` at line 210. The earlier status-described `PyTuple_Pack()` frontier is stale. One focused coding-agent delegation was attempted, but failed before child startup because the Anthropic package is unavailable and lazy installs are disabled. Therefore this run was diagnostics-only: no production/test changes and no TDD RED/GREEN implementation cycle are claimed. The tracked-state change is this status entry only; the compiler log is an untracked diagnostic artifact under `build/`.

Exact verification:

- Forced-fresh command: `mkdir -p build/cron-20261013T-current-reprobe/runtime && XDG_RUNTIME_DIR="$PWD/build/cron-20261013T-current-reprobe/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261013T-current-reprobe/probe.log 2>&1` — compiler/probe exit 2; `total=108 compiled=107 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First diagnostics: `tupleobject.c(209)` C2143 and `(210)` C2065 `i`. Full capture: `build/cron-20261013T-current-reprobe/probe.log`.
- Focused coding-agent delegation — failed before child startup: missing `anthropic` package; lazy installs disabled. No child edits occurred.
- Existing applicable regressions `python3 scripts/vc6-tupleobject-alloc-c89.test.py`, `python3 scripts/vc6-tupleobject-new-c89.test.py`, and `python3 scripts/vc6-tupleobject-pack-c89.test.py` — all exit 0. They validate existing separate tupleobject slices; no new test or implementation was made for `tupledealloc()`.
- `git -C cpython describe --tags --exact-match HEAD` → `v3.11.16`; `git -C cpython rev-parse HEAD` → `41388c9cb160d0886d5ca00d2e6c8782608a4549`. The outer checkout already had many unrelated dirty/untracked changes; all were preserved.
- No standalone compiler banner was captured. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution was produced. This is compiler-probe progress only, not a completed port.

Files changed by this run: `PORT_STATUS.md` only. Next frontier: when the focused coding-agent provider can start, address only the confirmed `tupledealloc()` declaration family at line 209 with TDD, preserving the assignment's existing point after `Py_TRASHCAN_BEGIN`; then rerun its focused VC6 probe and applicable regressions. Leave later tupleobject diagnostics untouched.

---
## Latest run (`_PyTuple_FromArraySteal()` allocation declaration; frontier advances)

Date: 2026-10-13 UTC

Read `PORT_STATUS.md`, `README.md`, and the CPython 3.11.16 Win9x/MSVC6 reference before acting. Preserved all prior work; no reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. CPython remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

Forced-fresh MSVC600/Wine probe confirmed `_PyTuple_FromArraySteal()`'s late initialized `PyTupleObject *tuple` declaration at line 408 as the current first blocker. One focused Codex CLI coding lane (`codex-cli 0.153.4`, workspace-write/ephemeral) added a focused C89/order regression and changed only this declaration family: `tuple` is declared at function entry, with `tuple = tuple_alloc(n);` retained after the `n == 0` return. Later loop-index and `dst` declarations, refcount and error behavior remain untouched. No unrelated existing content was overwritten. The lane's exact TDD RED output was not independently captured in this run record; only post-change test success is claimed here.

Exact verification:

- Forced-fresh command: `mkdir -p build/cron-20261014-blake2-frontier/runtime && XDG_RUNTIME_DIR="$PWD/build/cron-20261014-blake2-frontier/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261014-blake2-frontier/probe.log 2>&1` — actual probe exit 2; summary `total=108 compiled=107 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First diagnostics are `tupleobject.c(408)` C2275/C2065 (`PyTupleObject`/`tuple`); distinct subsequent loop and destination declarations remain. Capture: `build/cron-20261014-blake2-frontier/probe.log`.
- `python3 scripts/vc6-tupleobject-from-array-steal-tuple-c89.test.py` — exit 0; reports declaration placement and evaluation/refcount/error order PASS. All six `scripts/vc6-tupleobject-*.test.py` scripts — exit 0. `git -C cpython diff --check -- Objects/tupleobject.c` — exit 0.
- `git -C cpython describe --tags --exact-match HEAD` → `v3.11.16`; `git -C cpython rev-parse HEAD` → `41388c9cb160d0886d5ca00d2e6c8782608a4549`.
- No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution was produced. This is compiler-probe progress only.

Files changed by this slice: `cpython/Objects/tupleobject.c` (one declaration/assignment split), new `scripts/vc6-tupleobject-from-array-steal-tuple-c89.test.py`, and `PORT_STATUS.md`. Next frontier: force-fresh probe first; if unchanged, isolate the `_PyTuple_FromArraySteal()` loop index declaration at line 410 in a separate TDD slice, leaving `dst` and all later tupleobject blockers distinct.

---
## Latest run (`_PyTuple_FromArraySteal()` destination declaration; frontier advances)

Date: 2026-10-14 UTC

Read `PORT_STATUS.md`, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved existing outer and detached CPython work; no reset, clean, stash, discard, commit, push, publication, or patch regeneration. CPython baseline remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

Forced-fresh MSVC600/Wine probe confirmed the recorded `dst` declaration blocker in `_PyTuple_FromArraySteal()`. One focused Codex CLI lane (`codex-cli 0.153.4`, OpenAI provider, workspace-write/ephemeral; session `01a13750-9c4c-70e1-acb0-fb6882e3546e`) used strict TDD. The newly added focused test failed before production edit with the expected assertion that function-scope `PyObject **dst` must precede statements. The sole production change hoists `PyObject **dst;` into the function declaration block and retains `dst = tuple->ob_item;` immediately after the allocation-success check. The subsequent loop index and item declarations remain untouched. Two pre-existing focused expectation tests necessarily encoded the former declaration layout; they were narrowly updated to expect the hoisted declaration and assignment. Other tupleobject code/tests were preserved. The lane reported hash-snapshot verification; independent source-diff inspection confirms only the intended declaration/assignment transformation. No commit or publication was performed.

Exact verification:

- Baseline: `git -C cpython describe --tags --exact-match HEAD` → `v3.11.16`; `git -C cpython rev-parse HEAD` → `41388c9cb160d0886d5ca00d2e6c8782608a4549`.
- Before-change forced-fresh command: `mkdir -p build/cron-20261014-reprobe/runtime && XDG_RUNTIME_DIR="$PWD/build/cron-20261014-reprobe/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261014-reprobe/probe.log 2>&1` — compiler/probe exit 2; summary `total=108 compiled=107 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First errors were `tupleobject.c(417)` C2275/C2065/C2100 for `PyObject`/`dst`; separate loop diagnostics followed. A log-filter helper then exited 1 due to its own Python slicing-expression bug; the saved probe log is valid and the diagnostics were recovered from it. Capture: `build/cron-20261014-reprobe/probe.log`.
- TDD RED: `python3 scripts/vc6-tupleobject-from-array-steal-dst-c89.test.py` before source edit — exit 1 on the expected function-scope declaration assertion. GREEN after the edit — exit 0.
- Applicable regressions: `set -e; python3 scripts/vc6-tupleobject-from-array-steal-dst-c89.test.py; python3 scripts/vc6-tupleobject-from-array-steal-c89.test.py; python3 scripts/vc6-tupleobject-from-array-steal-tuple-c89.test.py; for test in scripts/vc6-tupleobject-*.test.py; do python3 "$test"; done` — exit 0; all eight tupleobject scripts passed. An initial loop without `set -e` revealed that the two old focused expectations failed on stale layout assertions; those directly related expectations were updated and the complete suite then passed.
- Post-change forced-fresh command: `mkdir -p build/cron-20261014-after/runtime && XDG_RUNTIME_DIR="$PWD/build/cron-20261014-after/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261014-after/probe.log 2>&1` — compiler/probe exit 2; summary `total=108 compiled=107 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. Former `dst` diagnostics at line 417 are gone. First remaining blocker is the separate C99 loop-index declaration at line 419 (C2143/C2059); later tupleobject blockers remain untouched. Capture: `build/cron-20261014-after/probe.log`.
- `git -C cpython diff --check -- Objects/tupleobject.c` and outer `git diff --check` for the status/focused tests — exit 0. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution was produced. This is compiler-probe progress only.

Files changed by this slice: `cpython/Objects/tupleobject.c` (only `_PyTuple_FromArraySteal()` `dst` declaration/assignment split), new `scripts/vc6-tupleobject-from-array-steal-dst-c89.test.py`, narrowly updated `scripts/vc6-tupleobject-from-array-steal-c89.test.py` and `scripts/vc6-tupleobject-from-array-steal-tuple-c89.test.py`, and this status entry. Next: force-fresh probe before editing; if unchanged, isolate only `_PyTuple_FromArraySteal()`'s success-path loop-index declaration at line 419 in a separate TDD slice. Do not claim port completion.

---
## Latest verified slice (`tuple_vectorcall()` `nargs` declaration; frontier advances)

Date: 2026-10-14 13:15 UTC

Read `PORT_STATUS.md`, `README.md`, and the CPython 3.11.16 Win9x/MSVC6 reference before acting. Preserved all pre-existing root and detached CPython work; no reset, clean, stash, discard, commit, push, publication, or patch regeneration. CPython baseline remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The top-recorded `tuplerepeat()` `dest_end` frontier was force-reprobed first and confirmed fixed in the current checkout. The actual first compiler blocker was the next distinct defect family: `tuple_vectorcall()`'s late initialized `Py_ssize_t nargs` declaration at `tupleobject.c:733`. One focused Codex CLI coding lane (`codex-cli 0.153.4`, OpenAI provider, workspace-write/ephemeral; session `01a13a92-0248-7e32-9a21-722106ba2320`) followed strict TDD. New `scripts/vc6-tupleobject-vectorcall-nargs-c89.test.py` failed before the production edit on the expected missing function-entry declaration assertion. The sole production edit declares `nargs` in the function's initial declaration block and assigns `nargs = PyVectorcall_NARGS(nargsf);` at the original point immediately after keyword validation. The argument validation and return paths are unchanged. A hash snapshot verified all pre-existing dirty/untracked files except the intended `cpython/Objects/tupleobject.c` were byte-identical during the coding lane.

Exact verification:

- Before-change forced-fresh command: `XDG_RUNTIME_DIR="$PWD/build/cron-20261014T131503Z-frontier/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261014T131503Z-frontier/probe.log 2>&1` — actual probe exit 2; summary `total=108 compiled=107 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled, then `tupleobject.c(733)` reported C2275 (`Py_ssize_t` used as expression), C2146 (missing `;` before `nargs`), C2065 (`nargs` undeclared). Later distinct diagnostics included designated initializer at line 917, `index` at 1236, and C89 loops at 1257/1276. Capture: `build/cron-20261014T131503Z-frontier/probe.log`.
- TDD RED: `python3 scripts/vc6-tupleobject-vectorcall-nargs-c89.test.py` before production edit — exit 1 on the expected assertion that `nargs` must be in the opening declaration block.
- GREEN and applicable regression suite: focused test and `for test in scripts/vc6-tupleobject-*.test.py; do python3 "$test" cpython/Objects/tupleobject.c || exit "$?"; done` — exit 0; all 12 tupleobject regression scripts pass.
- After-change forced-fresh command: `XDG_RUNTIME_DIR="$PWD/build/cron-20261014T131503Z-frontier/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261014T131503Z-frontier/probe-after.log 2>&1` — actual probe exit 2; summary `total=108 compiled=107 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled; former `tupleobject.c(733)` diagnostics are gone. Next tupleobject blocker is C2059 on the separate designated initializer at line 919; distinct late `index` declaration at 1238 and C89 loops at 1259/1278 remain untouched. Capture: `build/cron-20261014T131503Z-frontier/probe-after.log`.
- `git -C cpython diff --check -- Objects/tupleobject.c` and `git diff --check -- scripts/vc6-tupleobject-vectorcall-nargs-c89.test.py` — exit 0. Baseline tag/commit remain unchanged.
- No `pythoncore.dll`/`python.exe` link, Wine interpreter execution, or real Windows 98 SE execution occurred. This is compiler-probe progress only.

Files changed by this slice: `cpython/Objects/tupleobject.c` (only `tuple_vectorcall()` `nargs` declaration/assignment split), new `scripts/vc6-tupleobject-vectorcall-nargs-c89.test.py`, and this status entry. Next frontier: in a separate TDD slice, force-fresh confirm and address only the `tupleobject.c:919` designated initializer; leave `index` and later C89 loop declarations separate. No completed port is claimed.

---
## Latest verified slice (`tuple_vectorcall()` `nargs` declaration; frontier advances)

Date: 2026-10-14 13:15 UTC

Read `PORT_STATUS.md`, `README.md`, and the CPython 3.11.16 Win9x/MSVC6 reference before acting. Preserved all pre-existing root and detached CPython work; no reset, clean, stash, discard, commit, push, publication, or patch regeneration. CPython baseline remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The top-recorded `tuplerepeat()` `dest_end` frontier was force-reprobed first and confirmed fixed in the current checkout. The actual first compiler blocker was the next distinct defect family: `tuple_vectorcall()`'s late initialized `Py_ssize_t nargs` declaration at `tupleobject.c:733`. One focused Codex CLI coding lane (`codex-cli 0.153.4`, OpenAI provider, workspace-write/ephemeral; session `01a13a92-0248-7e32-9a21-722106ba2320`) followed strict TDD. New `scripts/vc6-tupleobject-vectorcall-nargs-c89.test.py` failed before the production edit on the expected missing function-entry declaration assertion. The sole production edit declares `nargs` in the function's initial declaration block and assigns `nargs = PyVectorcall_NARGS(nargsf);` at the original point immediately after keyword validation. The argument validation and return paths are unchanged. A hash snapshot verified all pre-existing dirty/untracked files except the intended `cpython/Objects/tupleobject.c` were byte-identical during the coding lane.

Exact verification:

- Before-change forced-fresh command: `XDG_RUNTIME_DIR="$PWD/build/cron-20261014T131503Z-frontier/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261014T131503Z-frontier/probe.log 2>&1` — actual probe exit 2; summary `total=108 compiled=107 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled, then `tupleobject.c(733)` reported C2275 (`Py_ssize_t` used as expression), C2146 (missing `;` before `nargs`), C2065 (`nargs` undeclared). Later distinct diagnostics included designated initializer at line 917, `index` at 1236, and C89 loops at 1257/1276. Capture: `build/cron-20261014T131503Z-frontier/probe.log`.
- TDD RED: `python3 scripts/vc6-tupleobject-vectorcall-nargs-c89.test.py` before production edit — exit 1 on the expected assertion that `nargs` must be in the opening declaration block.
- GREEN and applicable regression suite: focused test and `for test in scripts/vc6-tupleobject-*.test.py; do python3 "$test" cpython/Objects/tupleobject.c || exit "$?"; done` — exit 0; all 12 tupleobject regression scripts pass.
- After-change forced-fresh command: `XDG_RUNTIME_DIR="$PWD/build/cron-20261014T131503Z-frontier/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261014T131503Z-frontier/probe-after.log 2>&1` — actual probe exit 2; summary `total=108 compiled=107 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled; former `tupleobject.c(733)` diagnostics are gone. Next tupleobject blocker is C2059 on the separate designated initializer at line 919; distinct late `index` declaration at 1238 and C89 loops at 1259/1278 remain untouched. Capture: `build/cron-20261014T131503Z-frontier/probe-after.log`.
- `git -C cpython diff --check -- Objects/tupleobject.c` and `git diff --check -- scripts/vc6-tupleobject-vectorcall-nargs-c89.test.py` — exit 0. Baseline tag/commit remain unchanged.
- No `pythoncore.dll`/`python.exe` link, Wine interpreter execution, or real Windows 98 SE execution occurred. This is compiler-probe progress only.

Files changed by this slice: `cpython/Objects/tupleobject.c` (only `tuple_vectorcall()` `nargs` declaration/assignment split), new `scripts/vc6-tupleobject-vectorcall-nargs-c89.test.py`, and this status entry. Next frontier: in a separate TDD slice, force-fresh confirm and address only the `tupleobject.c:919` designated initializer; leave `index` and later C89 loop declarations separate. No completed port is claimed.

---
## Latest verified slice (`type_cache_clear()` C89 loop index; frontier advances)

Date: 2026-10-15 UTC

Read `PORT_STATUS.md` and `README.md` before acting. The referenced CPython-specific legacy-toolchain reference was not available as a readable file in this workspace; the invoked skill guidance was applied. Preserved all pre-existing outer and detached CPython changes; no reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. Baseline remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The prior `_blake2/blake2s_impl.c` frontier is stale: the forced-fresh compiler probe compiled it and advanced to `Objects/typeobject.c`. The first blocker was the C99 loop-index declaration in `type_cache_clear()` at line 214. One focused authenticated Codex CLI coding lane (`codex-cli 0.153.4`, workspace-write/ephemeral; session `01a13cf7-8be8-74c3-b839-7fd408fcd96d`) used strict TDD. The new `scripts/vc6-typeobject-cache-clear-index-c89.test.py` failed before the production edit (exit 1) because `Py_ssize_t i` was not declared at function entry. The sole production change hoists that declaration and changes the loop initializer to assignment; loop bound, increment, and body order remain unchanged. `_PyType_InitCache()`'s separate loop at line 227 was not touched. The agent reported its tracked/untracked file hash snapshot remained unchanged outside these two authorized paths.

Exact verification:

- Baseline: `git -C cpython describe --tags --exact-match HEAD` → `v3.11.16`; `git -C cpython rev-parse HEAD` → `41388c9cb160d0886d5ca00d2e6c8782608a4549`.
- Before-change forced-fresh command: `mkdir -p build/cron-20261015-frontier/runtime && XDG_RUNTIME_DIR="$PWD/build/cron-20261015-frontier/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261015-frontier/probe.log 2>&1` — actual probe exit 2; summary `total=109 compiled=108 cached=0 skipped=0`. First errors: `typeobject.c(214)` C2143/C2065/C2059 on `for (Py_ssize_t i = 0; ...)`; next separate loop at line 227 left untouched. `_blake2/blake2s_impl.c` was not the frontier. Full capture: `build/cron-20261015-frontier/probe.log`.
- TDD RED: `python3 scripts/vc6-typeobject-cache-clear-index-c89.test.py` before source edit — exit 1, expected missing function-entry declaration assertion.
- Focused GREEN and applicable regressions: `python3 scripts/vc6-typeobject-cache-clear-index-c89.test.py` — exit 0; `for test in scripts/vc6-typeobject-*.test.py; do python3 "$test" || exit; done` — exit 0, one matching test.
- After-change forced-fresh command: `mkdir -p build/cron-20261015-frontier-after/runtime && XDG_RUNTIME_DIR="$PWD/build/cron-20261015-frontier-after/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261015-frontier-after/probe.log 2>&1` — actual probe exit 2; summary `total=109 compiled=108 cached=0 skipped=0`. Former line-214 diagnostics are gone; next distinct blocker is `_PyType_InitCache()`'s separate C99 loop declaration at `typeobject.c(228)` (C2143/C2065/C2059). Full capture: `build/cron-20261015-frontier-after/probe.log`.
- Independent checks: focused/all matching typeobject tests and scoped nested/outer `git diff --check` — exit 0. Detached baseline unchanged. No linked `pythoncore.dll`/`python.exe`, Wine interpreter execution, or Windows 98 SE execution occurred. Compiler-probe progress only.

Files changed by this slice: `cpython/Objects/typeobject.c` (only the `type_cache_clear()` loop-index declaration/initializer split), new `scripts/vc6-typeobject-cache-clear-index-c89.test.py`, and this status entry. Next frontier: force-fresh confirm before a separate strict-TDD slice for only `_PyType_InitCache()`'s loop index. No completed port is claimed.

---
## Latest run (forced-fresh typeobject frontier; implementation lane unavailable)

Date: 2026-10-15 02:42 UTC

Read `PORT_STATUS.md`, `README.md`, and the CPython 3.11.16 Win9x/MSVC6 reference before acting. Preserved the existing outer and detached CPython work; no reset, clean, stash, discard, commit, push, publication, or patch regeneration. Baseline remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The requested `_blake2/blake2s_impl.c` sequence was not the current frontier. The forced-fresh probe compiled `_blake2/blake2s_impl.c`; the first stable blocker remains `_PyType_InitCache()`'s separate C99 loop-index declaration at `Objects/typeobject.c:228`, following the already-fixed `type_cache_clear()` loop. One focused coding-agent delegation was attempted for this defect only, but the provider could not start because no Anthropic credentials are configured. Accordingly this run is diagnostics-only: no production or regression-test edits and no TDD cycle are claimed. Existing work remains untouched.

Exact verification:

- Fresh probe command: `mkdir -p build/cron-20261016-frontier-refresh/runtime && XDG_RUNTIME_DIR="$PWD/build/cron-20261016-frontier-refresh/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261016-frontier-refresh/probe.log 2>&1` — probe exit 2; summary `total=109 compiled=108 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First diagnostics: `typeobject.c(228)` C2143/C2065/C2059 for `for (Py_ssize_t i = 0; ...)`; the next distinct compiler errors begin at `typeobject.c(306)`. Capture: `build/cron-20261016-frontier-refresh/probe.log`.
- Coding-agent delegation for the single confirmed loop-index defect — failed before child startup: no Anthropic credentials configured. No child edits occurred.
- Existing focused regression: `python3 scripts/vc6-typeobject-cache-clear-index-c89.test.py` — exit 0 (`type_cache_clear index C89 declaration and unchanged loop body: PASS`). This tests the preceding fixed loop, not the current `_PyType_InitCache()` blocker; no new test was added.
- Baseline checks: `git -C cpython describe --tags --exact-match HEAD` → `v3.11.16`; `git -C cpython rev-parse HEAD` → `41388c9cb160d0886d5ca00d2e6c8782608a4549`. Scoped nested and outer `git diff --check` — both exit 0.
- The probe did not link `pythoncore.dll`/`python.exe`, run an interpreter under Wine, or execute on Windows 98 SE. This is compiler-probe progress only.

Files changed this run: `PORT_STATUS.md` only; diagnostic capture is under `build/cron-20261016-frontier-refresh/`. Next frontier: when an authorized coding-agent provider is available, use one strict-TDD slice for only `_PyType_InitCache()`'s loop index at line 228, then run the forced-fresh probe and applicable typeobject regressions. No completed port is claimed.

---
## Latest run (fresh type_mro_modified frontier; implementation lane unavailable)

Date: 2026-10-15 UTC

Read `PORT_STATUS.md`, `README.md`, and the CPython 3.11.16 Win9x/MSVC6 reference before acting. Preserved all existing outer and detached CPython changes; no reset, clean, stash, discard, commit, push, publication, or compatibility-patch regeneration. Baseline remains tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded frontier remains current: `_blake2/blake2s_impl.c` compiled, then the first compiler diagnostic was the C89 declaration in `type_mro_modified()` at `cpython/Objects/typeobject.c(362)` (C2143, missing `;` before `type`). The later `custom_mro` diagnostic at line 365 is separate and was left untouched. One focused coding-subagent delegation was attempted for a single TDD fix but failed before child startup because no Anthropic credentials are configured. Following the delegation workflow, this run is diagnostics-only: no source/test edits or TDD RED/GREEN cycle are claimed.

Exact verification:

- Forced-fresh command: `mkdir -p "$TMPDIR/cp311-current-reprobe/runtime"; XDG_RUNTIME_DIR="$TMPDIR/cp311-current-reprobe/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > "$TMPDIR/cp311-current-reprobe/probe.log" 2>&1` — probe exit 2; summary `total=109 compiled=108 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First stable diagnostic is `typeobject.c(362)` C2143. Next distinct diagnostic: `typeobject.c(365)` C2065 for `custom_mro`. Capture: `$TMPDIR/cp311-current-reprobe/probe.log`.
- Applicable regressions: `for test in scripts/vc6-typeobject-*.test.py; do python3 "$test" || exit $?; done` — exit 0; all five typeobject scripts passed.
- `git -C cpython describe --tags --exact-match HEAD` → `v3.11.16`; `git -C cpython rev-parse HEAD` → `41388c9cb160d0886d5ca00d2e6c8782608a4549`. `git -C cpython diff --check -- Objects/typeobject.c` — exit 0.
- No production or regression-test files changed this run. No pythoncore/python.exe link, Wine interpreter execution, or real Windows 98 SE execution occurred. This is compiler-probe progress only, not a completed port.

Files changed this run: `PORT_STATUS.md` only. Next frontier: once a focused coding lane can start, use one strict-TDD slice for only the `type_mro_modified()` declaration at line 362; preserve initialization/evaluation timing and keep `custom_mro` separate. Do not claim port completion.

---
## Latest verified slice (`assign_version_tag()` bases declaration; frontier advances)

Date: 2026-10-15 UTC

Read `PORT_STATUS.md`, `README.md`, and `legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved the extensive pre-existing dirty/untracked root and detached CPython work. No reset, clean, stash, discard, commit, push, publication, or patch regeneration. CPython remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded frontier was force-reprobed first and confirmed: `_blake2/blake2s_impl.c` compiled, then the first stable errors were `typeobject.c(407)` C2275/C2065 for late `PyObject *bases = type->tp_bases;`, followed by the separate `n` declaration and loop-index declaration. Note the prior status described line 407 as `type_mro_modified()`; source inspection established it is actually `assign_version_tag()`. One authenticated Codex CLI 0.153.4 workspace-write/ephemeral lane applied strict TDD to only the `bases` declaration: new test failed before the source edit on the expected declaration assertion, then passed after hoisting `PyObject *bases;` and assigning `bases = type->tp_bases;` at the original evaluation point. `n`, loop index, and subsequent blockers were untouched. Coding lane preservation report was independently inspected; source diff is restricted to this function's bases declaration plus earlier pre-existing changes, and PORT_STATUS.md remained unchanged during that lane.

Exact verification:

- Before-change forced-fresh command: `XDG_RUNTIME_DIR="$TMPDIR/cp311-frontier-cron-20261015T200131Z/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` — exit 2; summary `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First errors at `typeobject.c(407)` C2275/C2065 (`PyObject`/`bases`); the next distinct declaration family was `n` at line 408. Capture: `$TMPDIR/cp311-frontier-cron-20261015T200131Z/probe.log`.
- TDD RED: `python3 scripts/vc6-typeobject-mro-bases-c89.test.py` before production edit — exit 1 at the expected missing opening-declaration assertion. Focused GREEN — exit 0.
- Focused regression plus all `scripts/vc6-typeobject-*.test.py` — exit 0; all seven tests pass. `git -C cpython diff --check -- Objects/typeobject.c` and `git diff --check -- scripts/vc6-typeobject-mro-bases-c89.test.py` — exit 0.
- After-change forced-fresh command with equivalent Wine environment — exit 2; summary `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. Former line-407 `bases` diagnostics are gone. First remaining errors are the separate `Py_ssize_t n` declaration at `typeobject.c(409)` (C2275/C2146/C2065); loop-index diagnostics follow at line 410, both untouched. Capture: `$TMPDIR/cp311-frontier-after-bases-20261015T200733Z/probe.log`.
- Exact baseline tag/commit verified unchanged. No pythoncore/python.exe link, Wine interpreter execution, or real Windows 98 SE execution occurred; compiler-probe progress only.

Files changed by this slice: `cpython/Objects/typeobject.c` (only the `assign_version_tag()` `bases` declaration/assignment split), new `scripts/vc6-typeobject-mro-bases-c89.test.py`, and this status entry. Next frontier: force-fresh confirm, then address only `assign_version_tag()`'s `n` declaration in a separate slice. No completed port is claimed.

---
## Latest verified slice (`mro_hierarchy()` `new_mro` C89 declaration)

Date: 2026-10-16 05:02 UTC

Read `PORT_STATUS.md`, `README.md`, and the CPython Win9x/MSVC6 reference before acting. The requested `/home/ubuntu/projects/python-win9x` checkout does not exist; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Preserved all pre-existing root and detached CPython work; no reset, clean, stash, discard, commit, push, or publication. CPython baseline remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The status-recorded `_PyType_Name()` frontier was no longer first. A forced-fresh VC6/Wine probe confirmed `_blake2/blake2s_impl.c` compiles and exposed `mro_hierarchy()`'s late initialized `PyObject *new_mro` declaration as the first blocker. The Hermes delegation provider could not start because Anthropic credentials are unavailable. The installed authenticated `codex-cli 0.153.4` performed one focused implementation lane under strict TDD. New test RED failed on the expected missing opening-block declaration before production change. The sole production change hoists `PyObject *new_mro;` and assigns `new_mro = type->tp_mro;` after the existing `res <= 0` return guard. The later `tuple` declaration and other defect families remain untouched.

Exact verification:

- Before-change: `mkdir -p "$TMPDIR/cp311-cron-frontier/runtime"; XDG_RUNTIME_DIR="$TMPDIR/cp311-cron-frontier/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > "$TMPDIR/cp311-cron-frontier/probe.log" 2>&1` — probe exit 2; summary `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First diagnostics: `typeobject.c(677)` C2275 (`PyObject`) and C2065 (`new_mro`).
- TDD RED: `python3 scripts/vc6-typeobject-mro-hierarchy-new-mro-c89.test.py` before the source edit — exit 1 with the expected assertion that `new_mro` must be in the opening declarations.
- TDD GREEN and applicable regressions: the focused test and every `scripts/vc6-typeobject-*.test.py` — exit 0; all 11 typeobject scripts passed.
- After-change forced-fresh probe using the same command/environment, captured at `$TMPDIR/cp311-cron-after-mro-hierarchy/probe.log` — probe exit 2; summary remains `total=109 compiled=108 cached=0 skipped=0`. Former line-677 diagnostics are gone. First current errors are `typeobject.c(680)` C2275/C2065 for the distinct later `tuple` declaration; untouched. Subsequent diagnostics include C89 declarations/loops at lines 720-725.
- `git -C cpython describe --tags --exact-match HEAD` → `v3.11.16`; `git -C cpython rev-parse HEAD` → `41388c9cb160d0886d5ca00d2e6c8782608a4549`. Scoped `git diff --check` commands for the source, test, and status file exited 0. No pythoncore/python.exe link, Wine interpreter execution, or real Windows 98 SE execution occurred; this is compiler-probe progress only.

Files changed by this slice: `cpython/Objects/typeobject.c` (only the `mro_hierarchy()` declaration/assignment split), new `scripts/vc6-typeobject-mro-hierarchy-new-mro-c89.test.py`, and this status entry. Next frontier: force-fresh re-probe, then address only the `tuple` declaration if still first. Do not claim a completed port.

---
## Latest verified slice (`mro_hierarchy()` tuple declaration; frontier advances)

Date: 2026-10-16 UTC

The requested path `/home/ubuntu/projects/python-win9x` does not exist; used the actual checkout at `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read this status, `README.md`, and the CPython 3.11.16/MSVC6 reference at `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md`. Preserved the extensive pre-existing dirty/untracked state. No reset, clean, stash, discard, commit, push, or publication. CPython baseline remains tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded `_PyType_Name()` state was stale. Fresh forced probes confirmed it already passes and the actual first blocker was the late `PyObject *tuple` declaration in `mro_hierarchy()` at `typeobject.c(680)`. Hermes delegation could not start because its configured Anthropic provider lacks credentials; the installed authenticated Codex CLI (`codex-cli 0.153.4`) performed one focused implementation lane under strict TDD. New `scripts/vc6-typeobject-mro-hierarchy-tuple-c89.test.py` failed before production editing (exit 1) on the intended opening-declaration assertion. The only production change hoists `PyObject *tuple;` to the opening declaration block. Both original branch assignments and their evaluation timing remain unchanged. Updated the directly applicable existing `scripts/vc6-typeobject-mro-hierarchy-new-mro-c89.test.py` expectation. No other defect family changed.

Exact verification:

- Before-change forced-fresh command: `mkdir -p "$TMPDIR/cron-20261016-refresh/runtime"; XDG_RUNTIME_DIR="$TMPDIR/cron-20261016-refresh/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > "$TMPDIR/cron-20261016-refresh/probe.log" 2>&1` — actual exit 2; summary `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First stable diagnostic family: `typeobject.c(680)` C2275 (`PyObject`) and C2065 (`tuple`). Capture: `$TMPDIR/cron-20261016-refresh/probe.log`.
- TDD RED: `python3 scripts/vc6-typeobject-mro-hierarchy-tuple-c89.test.py` before production edit — exit 1, expected assertion `PyObject *tuple; must be in the opening declarations`.
- GREEN and applicable regressions: focused test and `for test in scripts/vc6-typeobject-*.test.py; do python3 "$test"; result=$?; printf '%s: exit %s\\n' "$test" "$result"; if [ "$result" -ne 0 ]; then exit "$result"; fi; done` — exit 0; all 12 typeobject scripts passed.
- After-change forced-fresh command: `mkdir -p "$TMPDIR/cron-20261016-after-mro-tuple/runtime"; XDG_RUNTIME_DIR="$TMPDIR/cron-20261016-after-mro-tuple/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > "$TMPDIR/cron-20261016-after-mro-tuple/probe.log" 2>&1` — actual exit 2; summary remains `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. Former line-680 diagnostics are gone. Next first blocker: `typeobject.c(720)` C2275/C2146/C2065 on the `Py_ssize_t n` declaration, followed by the C89 loop declaration at line 721; untouched. Capture: `$TMPDIR/cron-20261016-after-mro-tuple/probe.log`.
- `git -C cpython describe --tags --exact-match HEAD` → `v3.11.16`; `git -C cpython rev-parse HEAD` → `41388c9cb160d0886d5ca00d2e6c8782608a4549`. Scoped nested source and outer focused-test `git diff --check` — exit 0.
- No pythoncore/python.exe link, Wine interpreter execution, or real Windows 98 SE execution occurred. Compiler-probe progress only.

Files changed by this slice: `cpython/Objects/typeobject.c`, new `scripts/vc6-typeobject-mro-hierarchy-tuple-c89.test.py`, focused expectation update in `scripts/vc6-typeobject-mro-hierarchy-new-mro-c89.test.py`, and this status entry. Next frontier: force-fresh confirm, then isolate only `mro_hierarchy()`'s `Py_ssize_t n` declaration at line 720. Do not conflate compiler-probe progress with a linked or target-running interpreter; no completed port is claimed.

---
## Latest verified slice (`type_set_bases()` n C89 declaration; frontier advances)

Date: 2026-10-16 UTC

Read `PORT_STATUS.md`, `README.md`, and the CPython Win9x/MSVC6 reference before acting. The requested `/home/ubuntu/projects/python-win9x` path is absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Preserved all existing outer and detached CPython work; no reset, clean, stash, discard, commit, push, or publication. CPython remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

Fresh forced VC6/Wine probe confirmed the current first blocker was `type_set_bases()` at `Objects/typeobject.c:757`: late `Py_ssize_t n = PyTuple_GET_SIZE(new_bases);`. `_blake2/blake2s_impl.c` compiled. One focused coding-agent lane used Codex CLI 0.153.4 (workspace-write, ephemeral), since Hermes' configured delegation provider could not start without Anthropic credentials. Strict TDD added `scripts/vc6-typeobject-set-bases-n-c89.test.py`; its first run failed as expected because `n` was not declared in the opening block. A flawed initial test assertion counted a later rollback reassignment and failed after the implementation; the assertion was narrowed to the `PyTuple_GET_SIZE(new_bases)` read, and RED was repeated against the preserved pre-edit source, exiting 1 as expected. The only production change hoists `Py_ssize_t n;` and leaves `n = PyTuple_GET_SIZE(new_bases);` after all argument validation and the empty-tuple check. The C89 loop index and all later declarations remain unchanged.

Exact verification:

- Before-change forced-fresh command: `mkdir -p "$TMPDIR/cron-recheck-frontier/runtime"; XDG_RUNTIME_DIR="$TMPDIR/cron-recheck-frontier/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > "$TMPDIR/cron-recheck-frontier/probe.log" 2>&1` — probe exit 2; summary `total=109 compiled=108 cached=0 skipped=0`. First stable errors were `typeobject.c(757)` C2275/C2146/C2065 on `n`, followed by C89 loop declaration diagnostics at line 758. `_blake2/blake2s_impl.c` compiled. Log: `$TMPDIR/cron-recheck-frontier/probe.log`.
- TDD RED: `python3 scripts/vc6-typeobject-set-bases-n-c89.test.py` on unchanged production source — exit 1, expected opening-declaration assertion. After correcting the overbroad rollback-count assertion, repeated RED against original source — exit 1 on the same expected missing declaration. GREEN: focused script — exit 0.
- Applicable tests: `for test in scripts/vc6-typeobject-*.test.py; do python3 "$test" || exit "$?"; done` — exit 0; all 14 typeobject tests passed.
- After-change forced-fresh command: `mkdir -p "$TMPDIR/cron-after-set-bases-n/runtime"; XDG_RUNTIME_DIR="$TMPDIR/cron-after-set-bases-n/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > "$TMPDIR/cron-after-set-bases-n/probe.log" 2>&1` — probe exit 2; summary `total=109 compiled=108 cached=0 skipped=0`. Former line-757 errors are gone; first blocker advances to `typeobject.c(760)` C2143/C2065/C2059 for the separate C89 loop-index declaration. Log: `$TMPDIR/cron-after-set-bases-n/probe.log`.
- `git -C cpython describe --tags --exact-match HEAD` → `v3.11.16`; `git -C cpython rev-parse HEAD` → `41388c9cb160d0886d5ca00d2e6c8782608a4549`. Nested and outer focused `git diff --check` — exit 0. The coding lane's preservation hash check passed; unrelated dirty/untracked files are preserved.
- No pythoncore/python.exe link, Wine interpreter execution, or Windows 98 SE execution occurred. Compiler-probe progress only.

Files changed by this slice: `cpython/Objects/typeobject.c` (only `type_set_bases()`'s `n` declaration/assignment split), new `scripts/vc6-typeobject-set-bases-n-c89.test.py`, and this status entry. Next frontier: force-fresh confirmation, then address only the `type_set_bases()` loop-index declaration at line 760 if it remains first. No completed port is claimed.

---
## Previous verified slice (`mro_hierarchy()` subclass-loop C89 declarations; frontier advances)

Date: 2026-10-16 UTC

Read `PORT_STATUS.md`, `README.md`, and searched both active-profile and project locations for the specified legacy-toolchain reference; that reference file is absent. Preserved all existing outer and detached CPython changes. No reset, clean, stash, discard, commit, push, publication, or patch regeneration. The requested path `/home/ubuntu/projects/python-win9x` does not exist in this runtime; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. CPython remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The current frontier was confirmed with a forced-fresh MSVC600/Wine probe before implementation: `_blake2/blake2s_impl.c` compiled, then VC6 reported C2275/C2146/C2065 at `Objects/typeobject.c(720)` on `Py_ssize_t n`, and C2143/C2065/C2059 at line 721 on `Py_ssize_t i`. One focused Hermes coding-subagent attempt failed before startup because Anthropic credentials are unavailable. The installed authenticated Codex CLI (`codex-cli 0.153.4`, workspace-write/ephemeral) performed the single scoped implementation lane under strict TDD. Its new regression failed before production changes as expected; the two existing `mro_hierarchy` test expectations also failed against the unchanged loop because they encode its prior tail. The lane updated only those directly applicable expectations and hoisted `n`/`i` to the opening declaration block. `n = PyList_GET_SIZE(subclasses)` remains after the NULL check; `i = 0` remains at the original loop initializer. Iteration, recursion, cleanup, and return ordering are unchanged. No other production defect family was edited.

Exact verification:

- Before-change forced-fresh command: `mkdir -p "$TMPDIR/cp311-run-current-retry/runtime"; XDG_RUNTIME_DIR="$TMPDIR/cp311-run-current-retry/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > "$TMPDIR/cp311-run-current-retry/probe.log" 2>&1` — exit 2; summary `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First stable errors at lines 720-721 as above. The immediately preceding identical attempt with a different fresh runtime timed out at 300s (exit 124); rerun completed. Log: `$TMPDIR/cp311-run-current-retry/probe.log`.
- TDD RED: new `python3 scripts/vc6-typeobject-mro-hierarchy-loop-c89.test.py` before production edit — exit 1 at expected opening declaration assertion. Existing `mro-hierarchy-new-mro` and `mro-hierarchy-tuple` tests also failed (exit 1) against unchanged source because their expected function prefix included the pre-slice loop syntax.
- GREEN/regressions: focused new test and all 13 `scripts/vc6-typeobject-*.test.py` scripts — exit 0; each reports PASS. The two prior expectations were narrowly updated to include the opening `n`/`i` declarations.
- After-change forced-fresh command: `mkdir -p "$TMPDIR/cp311-run-after/runtime"; XDG_RUNTIME_DIR="$TMPDIR/cp311-run-after/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > "$TMPDIR/cp311-run-after/probe.log" 2>&1` — exit 2; summary remains `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. Former `mro_hierarchy()` line 720-721 diagnostics are gone. New first blocker is `typeobject.c(757)` C2275/C2146/C2065 on late `Py_ssize_t n`, followed at line 758 by the C89 loop-index errors in the next function. Full log: `$TMPDIR/cp311-run-after/probe.log`.
- `git -C cpython diff --check -- Objects/typeobject.c` and outer `git diff --check -- scripts/vc6-typeobject-mro-hierarchy-loop-c89.test.py` — exit 0. Nested HEAD/tag remain exact. Porcelain comparison confirms no previously existing status entries changed; the sole new outer untracked path from this slice is the focused new regression test.
- No pythoncore/python.exe link, Wine interpreter execution, or real Windows 98 SE execution occurred. This is compiler-probe progress only.

Files changed by this slice: `cpython/Objects/typeobject.c`; new `scripts/vc6-typeobject-mro-hierarchy-loop-c89.test.py`; focused expected-prefix updates in `scripts/vc6-typeobject-mro-hierarchy-new-mro-c89.test.py` and `scripts/vc6-typeobject-mro-hierarchy-tuple-c89.test.py`; and this status entry. Next frontier: force-fresh confirm, then isolate only the `typeobject.c(757)` declaration defect family if still first. No completed port is claimed.

---
## Latest verified slice (`type_set_bases()` `new_base` C89 declaration; frontier advances)

Date: 2026-10-16 18:34 UTC

Read `PORT_STATUS.md`, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. The requested `/home/ubuntu/projects/python-win9x` path does not exist; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Preserved pre-existing dirty/untracked work; no reset, clean, stash, discard, commit, push, or publication. CPython baseline remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The status-recorded `type_set_bases()` `new_base` blocker was force-reprobed before editing and confirmed; `_blake2/blake2s_impl.c` compiled. One focused authenticated Codex CLI lane (`codex-cli 0.153.4`, OpenAI, workspace-write/ephemeral) implemented only this C89 declaration slice using TDD. New `scripts/vc6-typeobject-set-bases-new-base-c89.test.py` failed before the production edit with the intended missing opening-declaration assertion. The source change hoists `PyTypeObject *new_base;` beside the function's existing `n`/`i` declarations and retains `new_base = best_base(new_bases);` at the original evaluation point after the validation loop. No behavior or evaluation order was intentionally changed. The directly applicable base/index/n test expectations were updated to reflect the hoist; unrelated dirty/untracked paths were preserved. A pre-edit hash snapshot covered 217 dirty/untracked files; the agent verified all 216 other pre-existing files unchanged, and Hermes reviewed the exact source diff.

Exact verification:

- Before-change forced-fresh command: `mkdir -p build/cron-current-recheck/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-current-recheck/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-current-recheck/probe.log 2>&1` — exit 2; summary `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First diagnostics: `typeobject.c(791)` C2275/C2065 for the late `PyTypeObject *new_base`. Capture: `build/cron-current-recheck/probe.log`.
- TDD RED: `python3 scripts/vc6-typeobject-set-bases-new-base-c89.test.py` before production edit — exit 1 with the expected assertion that `new_base` is missing from the opening declaration block. GREEN: same test after the source edit — exit 0.
- First applicable regression run found three existing set-bases tests encoded the old declaration layout (exit 1); updated only those narrow expectations. Final `set -e; for test in scripts/vc6-typeobject-*.test.py; do python3 "$test"; done` — exit 0; all 17 typeobject tests pass. Scoped `git diff --check` for source and four relevant tests — exit 0.
- After-change forced-fresh probe: `mkdir -p build/cron-current-after-new-base/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-current-after-new-base/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-current-after-new-base/probe.log 2>&1` — probe exit 2; summary `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. The prior `typeobject.c(791)` new_base errors are gone. First current diagnostic group advances to the distinct late `PyObject *old_bases` declaration at `typeobject.c(800)` (C2275/C2065); left untouched. Capture: `build/cron-current-after-new-base/probe.log`.
- `git -C cpython describe --tags --exact-match HEAD` → `v3.11.16`; `git -C cpython rev-parse HEAD` → `41388c9cb160d0886d5ca00d2e6c8782608a4549`. No `pythoncore`/`python.exe` link, Wine interpreter execution, or real Windows 98 SE execution occurred: compiler-probe progress only.

Files changed by this slice: `cpython/Objects/typeobject.c`, new `scripts/vc6-typeobject-set-bases-new-base-c89.test.py`, updated `scripts/vc6-typeobject-set-bases-base-c89.test.py`, `scripts/vc6-typeobject-set-bases-index-c89.test.py`, `scripts/vc6-typeobject-set-bases-n-c89.test.py`, and this status entry. Next frontier: force-fresh re-probe before handling only the `type_set_bases()` `old_bases` declaration if it remains first. No completed port is claimed.

---
## Latest run (fresh frontier probe; implementation lane unavailable)

Date: 2026-10-16 UTC

Read `PORT_STATUS.md`, `README.md`, and the applicable `python-3-win9x-msvc6.md` reference before acting. The requested `/home/ubuntu/projects/python-win9x` path does not exist; used the existing checkout at `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. The workspace already contains extensive tracked/untracked modifications; preserved them. No reset, clean, stash, discard, commit, push, or publication. Baseline remains CPython tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The older recorded `_blake2/blake2s_impl.c` frontier is not current. A forced-fresh probe compiled that source, then first stopped at `typeobject.c(800)` on the late `PyObject *old_bases` declaration in `type_set_bases()`. The requested single focused coding-subagent implementation lane could not start: provider `anthropic` has no credentials (available providers are openrouter, nous, zai, kimi-coding, minimax). Per scope/TDD and preservation constraints, this run made no speculative production or regression-test edits; this is diagnostics-only.

Exact verification:

- `mkdir -p build/cron-20261016-refresh/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261016-refresh/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261016-refresh/probe.log 2>&1` — probe exit 2. Summary: `total=109 compiled=108 cached=0 skipped=0`. Log confirms `compile: cpython/Modules/_blake2/blake2s_impl.c` and `blake2s_impl.c`; first compiler diagnostics are `typeobject.c(800)` C2275 (`PyObject`) and C2065 (`old_bases`). Capture: `build/cron-20261016-refresh/probe.log`.
- `git -C cpython describe --tags --exact-match HEAD` → `v3.11.16`; `git -C cpython rev-parse HEAD` → `41388c9cb160d0886d5ca00d2e6c8782608a4549`.
- No production source or test file was changed by this run. No pythoncore/python.exe link, Wine interpreter execution, or real Windows 98 SE execution occurred. This is compiler-probe evidence only.

Files changed by this run: `PORT_STATUS.md` only. Next frontier: in a later run with a usable focused coding lane, TDD-test and address only the `old_bases` declaration at `typeobject.c(800)` after a fresh probe; leave later `old_base`, `temp`, and other defect families separate.

---
## Latest verified slice (`type_set_bases()` `old_base` declaration; frontier advances)

Date: 2026-10-17 UTC

Used the existing checkout `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`; requested `/home/ubuntu/projects/python-win9x` does not exist. Read this status, `README.md`, and the profile CPython Win9x/MSVC6 reference before acting. Preserved all existing dirty/untracked work. No reset, clean, stash, discard, commit, push, or publication. Baseline remains CPython tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded `old_base` frontier was force-fresh confirmed before edits. A delegated Hermes implementation lane could not start because Anthropic credentials are unavailable; authenticated `codex-cli 0.153.4` performed one focused coding lane. Under TDD, new `scripts/vc6-typeobject-set-bases-old-base-c89.test.py` failed first as expected, requiring `old_base` in the opening declaration block. The only production change adds `PyTypeObject *old_base;` beside existing `type_set_bases()` locals; its assignment and evaluation/control-flow order remain unchanged. Three directly affected declaration-order test expectations were updated to recognize this additional local.

Exact verification:

- Before-edit forced-fresh probe: `mkdir -p build/cron-current-reprobe/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-current-reprobe/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-current-reprobe/probe.log 2>&1` — exit 2; `_blake2/blake2s_impl.c` compiled; first stable error `typeobject.c(803)` C2065 `old_base`, followed by distinct `temp` and `res` errors.
- TDD RED: `python3 scripts/vc6-typeobject-set-bases-old-base-c89.test.py` before production edit — exit 1 on expected missing opening declaration.
- GREEN/regressions: focused test and all `scripts/vc6-typeobject-*.test.py` — final run exit 0, 19/19 passed. Existing expectation adjustments were limited to the three set-bases tests.
- After-edit forced-fresh command: `mkdir -p build/cron-old-base-after/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-old-base-after/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-old-base-after/probe.log 2>&1` — exit 2; `_blake2/blake2s_impl.c` compiled; prior `old_base` diagnostic is gone. Next diagnostics advance to `typeobject.c(809)` C2065 `temp`, then `res` at line 820; neither changed. Full capture: `build/cron-old-base-after/probe.log`.
- Scoped `git diff --check` for nested production and outer tests exited 0. Baseline tag and commit verified unchanged.
- No pythoncore/python.exe link, Wine interpreter run, or real Windows 98 SE execution occurred. Compiler-probe progress only.

Files changed by this slice: `cpython/Objects/typeobject.c`; new `scripts/vc6-typeobject-set-bases-old-base-c89.test.py`; updated declaration expectations in `scripts/vc6-typeobject-set-bases-index-c89.test.py`, `scripts/vc6-typeobject-set-bases-n-c89.test.py`, and `scripts/vc6-typeobject-set-bases-new-base-c89.test.py`; and this status entry. Next frontier: force-fresh re-probe, then isolate only `temp` if still first. No completed port is claimed.

---
## Latest verified slice (`lookup_maybe_method()` descriptor getter declaration; frontier advances)

Date: 2026-10-18 UTC

Used the existing checkout `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`; requested `/home/ubuntu/projects/python-win9x` does not exist. Read `PORT_STATUS.md`, `README.md`, and the active-profile CPython Win9x/MSVC6 reference before changing anything. Preserved the pre-existing extensive outer and detached CPython work; no reset, clean, stash, discard, commit, push, or publication. The previous `_blake2` frontier note was stale: a forced-fresh probe confirmed `_blake2/blake2s_impl.c` compiles, and the first stable blocker is in `lookup_maybe_method()` at `typeobject.c(1636)`. Baseline remains CPython tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

One focused authenticated Codex CLI lane (`codex-cli 0.153.4`, OpenAI; `--sandbox workspace-write --ephemeral`) followed strict TDD and preserved local changes. The new `scripts/vc6-typeobject-lookup-maybe-method-c89.test.py` failed against unchanged source (exit 1) on the intended missing opening-block declaration assertion. The sole production edit hoists `descrgetfunc f;` into `lookup_maybe_method()`'s opening declarations and changes its initialization to assignment immediately after the existing `*unbound = 0;`. Getter evaluation, branches, refcount behavior, and control flow remain in their original order. A source diff comparison confirmed this is the only `typeobject.c` delta from the pre-lane snapshot. `PORT_STATUS.md` was unchanged by the coding lane until this report was added.

Exact verification:

- Baseline: `git -C cpython describe --tags --exact-match HEAD` → `v3.11.16`; `git -C cpython rev-parse HEAD` → `41388c9cb160d0886d5ca00d2e6c8782608a4549`.
- Before-change forced-fresh command: `mkdir -p build/cron-20261018-current-reprobe/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261018-current-reprobe/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261018-current-reprobe/probe.log 2>&1` — probe exit 2; summary `total=109 compiled=108 cached=0 skipped=0`; first diagnostic `typeobject.c(1636)` C2275 for `descrgetfunc`, followed by declaration cascades. `_blake2/blake2s_impl.c` compiled. Capture: `build/cron-20261018-current-reprobe/probe.log`.
- TDD RED: `python3 scripts/vc6-typeobject-lookup-maybe-method-c89.test.py` before production edit — exit 1, expected `lookup_maybe_method: f must be declared in the opening declaration block (C89)`; exact source comparison against pre-edit snapshot passed.
- GREEN: same focused test after edit — exit 0, `lookup_maybe_method descriptor getter C89 declaration and unchanged evaluation/control flow: PASS`.
- Applicable regression suite: all 30 `scripts/vc6-typeobject-*.test.py` scripts — exit 0, zero failures. Detailed output: `/tmp/vc6-typeobject-lookup-maybe-method-tests.log`.
- After-change forced-fresh command: `mkdir -p build/cron-20261018-after-lookup-maybe-method/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261018-after-lookup-maybe-method/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261018-after-lookup-maybe-method/probe.log 2>&1` — probe exit 2; summary `total=109 compiled=108 cached=0 skipped=0`; former line-1636 diagnostic is gone. Next first stable blocker is a distinct declaration family in `vectorcall_method()` at `typeobject.c(1694)`, C2143 (followed by declaration cascades); left untouched. Capture: `build/cron-20261018-after-lookup-maybe-method/probe.log`.
- `git diff --check -- PORT_STATUS.md scripts/vc6-typeobject-lookup-maybe-method-c89.test.py` and `git -C cpython diff --check -- Objects/typeobject.c` — exit 0. Baseline tag/commit unchanged.
- Compiler-probe progress only. No `pythoncore`/`python.exe` link, Wine interpreter execution, or Windows 98 SE execution occurred. No completed port is claimed.

Files changed by this slice: `cpython/Objects/typeobject.c` (one declaration/assignment split); new `scripts/vc6-typeobject-lookup-maybe-method-c89.test.py`; and this `PORT_STATUS.md` entry. Next frontier: force-fresh confirm, then isolate only the first `vectorcall_method()` declaration blocker at line 1694. Keep later errors separate and do not conflate compiler-probe progress with a linked or running interpreter.

---
## Latest verified slice (`mro_implementation()` `bases` declaration; frontier advances)

Date: 2026-10-18 UTC

Used existing checkout `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`; requested `/home/ubuntu/projects/python-win9x` does not exist. Read this status, `README.md`, and the active-profile CPython 3.11.16/MSVC6 reference at `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before work. Preserved all pre-existing dirty/untracked work. No reset, clean, stash, discard, commit, push, or publication. CPython baseline remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded `_blake2/blake2s_impl.c` sequence was force-fresh reprobed and had advanced. Before edits, the actual first stable blocker was `mro_implementation()`'s late initialized `PyObject *bases` at `typeobject.c(1956)`, C2275/C2065; later `n`, loop-index and other errors were left untouched. Anthropic-backed delegation was unavailable (missing credentials). One focused authenticated Codex CLI 0.153.4 lane performed the implementation under strict TDD. New regression `scripts/vc6-typeobject-mro-implementation-bases-c89.test.py` failed on unchanged production source (exit 1, expected missing opening declaration assertion). The only production edit hoisted `PyObject *bases;` to the opening declaration block and retained `bases = type->tp_bases;` immediately after the original readiness guard, preserving read timing. The lane verified source-only delta and all snapshotted pre-existing dirty/untracked files unchanged.

Exact verification:

- Baseline: `git -C cpython describe --tags --exact-match HEAD` → `v3.11.16`; `git -C cpython rev-parse HEAD` → `41388c9cb160d0886d5ca00d2e6c8782608a4549`.
- Before-change forced-fresh probe: `mkdir -p build/cron-20261018-reprobe/runtime && XDG_RUNTIME_DIR="$PWD/build/cron-20261018-reprobe/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261018-reprobe/probe.log 2>&1` — exit 2; summary `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First diagnostics: `typeobject.c(1956)` C2275/C2065 for `bases`. Capture: `build/cron-20261018-reprobe/probe.log`.
- TDD RED: `python3 scripts/vc6-typeobject-mro-implementation-bases-c89.test.py` before production edit — exit 1, `AssertionError: mro_implementation: PyObject *bases; must be in the opening declarations`. GREEN: same command after edit — exit 0, `mro_implementation bases C89 declaration and guarded read timing: PASS`.
- Applicable regressions: `bash -o pipefail -c 'for test in scripts/vc6-typeobject-*.test.py; do printf "COMMAND: python3 %s\\n" "$test"; python3 "$test" || exit $?; done' | tee /tmp/mro-implementation-bases-tdd/typeobject-tests.log` — exit 0; all 33 scripts passed.
- After-change forced-fresh probe: `mkdir -p build/cron-20261018-after-mro-bases/runtime && XDG_RUNTIME_DIR="$PWD/build/cron-20261018-after-mro-bases/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261018-after-mro-bases/probe.log 2>&1` — exit 2; summary `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. Former `bases` diagnostics are gone. First current diagnostic family is `typeobject.c(1958)` C2275/C2146/C2065 for the separate `Py_ssize_t n` declaration, followed by C89 loop-index errors at line 1959; neither changed. Capture: `build/cron-20261018-after-mro-bases/probe.log`.
- No `pythoncore`/`python.exe` link, Wine interpreter execution, or Windows 98 SE execution occurred. This is compiler-probe progress only.

Files changed by this slice: `cpython/Objects/typeobject.c`, new `scripts/vc6-typeobject-mro-implementation-bases-c89.test.py`, and this status record. Next frontier: force-fresh confirm the `mro_implementation()` `Py_ssize_t n` declaration and address only that defect family. No completed port is claimed.

---
## MRO implementation `n` declaration slice (frontier advances)

Date: 2026-10-18 UTC. Existing checkout `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x` was used because requested `/home/ubuntu/projects/python-win9x` does not exist. Read this status, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md`. Preserved all existing outer and nested dirty/untracked work; no reset, clean, stash, discard, commit, push, or publication. CPython baseline remains tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

Forced-fresh MSVC600/Wine probe confirmed the recorded first family was stale in naming, but current at `mro_implementation()` line 1958: C2275/C2146/C2065 on late `Py_ssize_t n`. `_blake2/blake2s_impl.c` compiled. One focused Codex CLI lane (`codex-cli 0.153.4`, authenticated OpenAI, workspace-write/ephemeral) performed strict TDD. New `scripts/vc6-typeobject-mro-implementation-n-c89.test.py` failed before the source edit (exit 1, expected opening-declaration assertion); after minimal change, focused test and all 34 `scripts/vc6-typeobject-*.test.py` scripts passed (exit 0). The only production change hoists `Py_ssize_t n;` into the function declaration block and changes the later initialized declaration to `n = PyTuple_GET_SIZE(bases);` at its original point. `i` and later defect families were not changed. The existing `mro-implementation-bases` test expectation was updated only to account for the new declaration and assignment.

Exact evidence:
- Before probe: `mkdir -p build/cron-20261018-blake-reprobe/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261018-blake-reprobe/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261018-blake-reprobe/probe.log 2>&1` — exit 2; `_blake2/blake2s_impl.c` compiled; first errors at `typeobject.c(1958)` C2275/C2146/C2065 for `n`, followed by separate `i` errors at line 1959. Capture: `build/cron-20261018-blake-reprobe/probe.log`.
- TDD RED: `python3 scripts/vc6-typeobject-mro-implementation-n-c89.test.py` before production edit — exit 1, expected missing declaration assertion.
- GREEN/regressions: focused test and `for test in scripts/vc6-typeobject-*.test.py; do python3 "$test" || exit "$?"; done` — exit 0; all 34 passed.
- After probe: `mkdir -p build/cron-20261018-after-mro-n/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261018-after-mro-n/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261018-after-mro-n/probe.log 2>&1` — exit 2; `_blake2/blake2s_impl.c` compiled; all former `n` errors cleared. First remaining diagnostic is the separate C99 loop index `i` at `typeobject.c(1960)` (C2143/C2065/C2059 cascade); untouched. Capture: `build/cron-20261018-after-mro-n/probe.log`.
- `git -C cpython diff --check -- Objects/typeobject.c` — exit 0. Complete source delta was independently compared against the pre-edit snapshot; only the `n` declaration/assignment split is present. No pythoncore/python.exe link, Wine interpreter execution, or Windows 98 SE execution occurred; compiler-probe progress only.

Files changed by this slice: `cpython/Objects/typeobject.c`, new `scripts/vc6-typeobject-mro-implementation-n-c89.test.py`, adjusted expected prefix in `scripts/vc6-typeobject-mro-implementation-bases-c89.test.py`, and this entry. Next frontier: force-fresh confirm then handle only the separate loop index `i` in `mro_implementation()`. No completed port is claimed.

---
## Diagnostics-only: current typeobject frontier confirmed; coding lane unavailable

Date: 2026-10-19 UTC. The user-specified checkout `/home/ubuntu/projects/python-win9x` is absent; used the existing checkout `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read this status, `README.md`, and the active-profile legacy-toolchain reference `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md`. Preserved all pre-existing modified and untracked work; no reset, clean, stash, discard, commit, push, or publication. CPython baseline verified as tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded frontier remains current: a forced-fresh VC6/Wine probe compiled `_blake2/blake2s_impl.c` and confirmed first stable diagnostics at `Objects/typeobject.c(2072)` for late `PyTypeObject *base` (C2275/C2065), followed by dependent C2223 at 2078. Thus the old `_blake2` sequence is not the current blocker. Before acting, attempted the required one focused coding delegation; provider startup failed because Anthropic credentials are unavailable. No external coding CLI fallback was used; this run therefore made diagnostics-only progress and did not edit production or test code.

Exact verification:
- Forced-fresh probe: `mkdir -p build/cron-20261019-verify-frontier/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261019-verify-frontier/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261019-verify-frontier/probe.log 2>&1` — exit 2; summary `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First errors: `typeobject.c(2072)` C2275/C2065 (`PyTypeObject`/`base`), then C2223 at 2078. Capture: `build/cron-20261019-verify-frontier/probe.log`.
- Applicable regression suite: `for test in scripts/vc6-typeobject-*.test.py; do python3 "$test" >/dev/null || exit 1; done` — exit 0; all 40 tests passed.
- `git -C cpython describe --tags --exact-match HEAD` and `git -C cpython rev-parse HEAD` verified baseline above; `git -C cpython diff --check -- Objects/typeobject.c` — exit 0.

Files changed this run: `PORT_STATUS.md` only. No `pythoncore`/`python.exe` link, Wine interpreter execution, or real Windows 98 SE execution occurred; compiler-probe progress only. Next narrow frontier: when a coding lane is available, use strict TDD to fix only the `typeobject.c(2072)` `base` declaration family, then rerun the forced-fresh probe and applicable regressions. No completed port is claimed.

---
## Diagnostics-only: stale `_blake2` frontier; current blocker is `type_new_copy_slots()`

Date: 2026-10-19 UTC. The requested checkout `/home/ubuntu/projects/python-win9x` is absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read `PORT_STATUS.md`, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved all pre-existing tracked modifications and untracked files; no reset, clean, stash, discard, commit, push, or publication. CPython baseline remains tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

Forced-fresh VC6/Wine re-probe command: `mkdir -p build/cron-20261019-blake2-reprobe/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261019-blake2-reprobe/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261019-blake2-reprobe/probe.log 2>&1` — exit 2; summary `total=109 compiled=108 cached=0 skipped=0`. The existing modified `_blake2/blake2s_impl.c` was compiled successfully (object path logged at line 74); its nested diff was not altered. The recorded `_blake2` frontier is therefore stale. First stable errors now occur in `cpython/Objects/typeobject.c` at line 2630: C2275 (`Py_ssize_t` illegal use as expression), C2146 (missing `;` before `j`), and C2065 (`j` undeclared); line 2631 has cascading loop-index errors involving `i`. Full capture: `build/cron-20261019-blake2-reprobe/probe.log`.

No implementation or regression-test edit was made: this run establishes a different actual frontier, so the requested `_blake2/blake2s_impl.c` defect sequence was not touched. Compiler probe only; no `pythoncore`/`python.exe` link, Wine interpreter execution, or Windows 98 SE execution. Files changed this run: this status record only; probe log under `build/cron-20261019-blake2-reprobe/`. Next step: one focused strict-TDD slice for the line-2630 `type_new_copy_slots()` C89 declaration family after fresh confirmation; keep the separate line-2631 loop-index defect untouched. No completed port is claimed.

---
## `type_new_copy_slots()` C89 declaration slice (frontier advances)

Date: 2026-10-19 UTC. Requested checkout `/home/ubuntu/projects/python-win9x` is absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read `PORT_STATUS.md`, `README.md`, and the active-profile `python-3-win9x-msvc6.md` reference before work. Preserved all pre-existing dirty/untracked work. No reset, clean, stash, discard, commit, push, or publication. CPython baseline is tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

Fresh forced VC6/Wine probe command: `mkdir -p build/cron-20261019-current-reprobe/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261019-current-reprobe/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261019-current-reprobe/probe.log 2>&1` — exit 2; `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First errors were at `typeobject.c(2630)` C2275/C2146/C2065 on `Py_ssize_t j`, plus C2143/C2065 loop-index diagnostics at 2631. Capture: `build/cron-20261019-current-reprobe/probe.log`.

One focused Codex CLI coding lane (`codex-cli 0.153.4`, workspace-write/ephemeral; Hermes delegation provider unavailable for missing Anthropic credentials) followed strict TDD. Added `scripts/vc6-typeobject-type-new-copy-slots-c89.test.py` first; against unchanged production source it failed as expected (RED exit 1: opening C89 declarations missing), and a `cmp` confirmed source unchanged. Minimal edit in `cpython/Objects/typeobject.c` moves only local declarations `j`, `i`, `r`, and `tuple` in `type_new_copy_slots()` to legal C89 positions, preserving assignment/evaluation timing and control flow. Focused regression passed (exit 0); all 44 `scripts/vc6-typeobject-*.test.py` tests passed (exit 0). Preservation verification showed all previously dirty/untracked files unchanged apart from the intended nested source and added test.

After-change forced-fresh command: `mkdir -p build/cron-20261019-after-copy-slots/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261019-after-copy-slots/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261019-after-copy-slots/probe.log 2>&1` — exit 2; same `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. The line-2630 and 2631 diagnostics are gone. First remaining diagnostics now occur at `typeobject.c(2698)` C2143/C2065 for a distinct C99 loop-index declaration in `type_new_slots_bases()`; later declarations remain untouched. Capture: `build/cron-20261019-after-copy-slots/probe.log`. Nested and outer `git diff --check` both exited 0. Compiler-probe progress only: no `pythoncore`/`python.exe` link, Wine interpreter execution, or real Windows 98 SE execution. Files changed: nested `cpython/Objects/typeobject.c`, new focused regression, and this status entry. Next frontier: force-fresh confirm and isolate only the line-2698 loop-index family. No completed port is claimed.

---
## `type_new_slots_bases()` `base` C89 declaration slice (frontier advances)

Date: 2026-10-20 UTC. The requested checkout `/home/ubuntu/projects/python-win9x` is absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read `PORT_STATUS.md`, `README.md`, and the active-profile `python-3-win9x-msvc6.md` reference before acting. Preserved all existing local work. No reset, clean, stash, discard, commit, push, or publication. CPython baseline verified as tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded frontier was force-fresh confirmed. Before-change command: `mkdir -p build/cron-20261020-reprobe/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261020-reprobe/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261020-reprobe/probe.log 2>&1` — probe exit 2; summary `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First stable diagnostics: `typeobject.c(2705)` C2143 on late `PyTypeObject *base`, followed by C2065 `base` at 2708 and consequent C2223 at 2708/2713. Capture: `build/cron-20261020-reprobe/probe.log`.

The configured Hermes coding delegation provider was unavailable (Anthropic credentials missing); one authenticated Codex CLI lane (`codex-cli 0.153.4`, `gpt-6-astra`, workspace-write/ephemeral) performed the focused implementation. New `scripts/vc6-typeobject-type-new-slots-bases-base-c89.test.py` was run against byte-identical production source and failed as expected (RED exit 1: opening declaration assertion). The single production change declares `PyTypeObject *base;` after `obj` and before the skip condition, then assigns `base = _PyType_CAST(obj);` at the original point after the primary-base skip. This preserves retrieval, skip, and cast evaluation order. The child snapshot confirmed all 245 other pre-existing dirty/untracked files, including prior `typeobject.c` content outside this delta and this status file, remained byte-identical.

Verification: focused regression after the edit — exit 0. All 46 `scripts/vc6-typeobject-*.test.py` scripts — exit 0. `git diff --check -- scripts/vc6-typeobject-type-new-slots-bases-base-c89.test.py` and `git -C cpython diff --check -- Objects/typeobject.c` — exit 0. After-change forced-fresh command: `mkdir -p build/cron-20261020-after-slots-base/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261020-after-slots-base/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261020-after-slots-base/probe.log 2>&1` — probe exit 2; summary remains `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. Former diagnostics at 2705/2708/2713 are gone. First current diagnostic advances to `typeobject.c(2746)` C2275/C2065 for the separate `PyObject *new_slots` declaration; left untouched. Capture: `build/cron-20261020-after-slots-base/probe.log`.

Files changed by this slice: `cpython/Objects/typeobject.c`, new `scripts/vc6-typeobject-type-new-slots-bases-base-c89.test.py`, and this status entry. Compiler-probe progress only: no `pythoncore`/`python.exe` link, Wine interpreter execution, or real Windows 98 SE execution occurred. Next frontier: force-fresh confirm and isolate only the `type_new_slots_impl()` line-2746 `new_slots` declaration family. No completed port is claimed.

---
## `type_new_set_module()` module declaration C89 slice (frontier advances)

Date: 2026-10-21 UTC. Requested checkout `/home/ubuntu/projects/python-win9x` is absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read this status, `README.md`, and the legacy-toolchain CPython 3.11.16/MSVC6 reference before acting. Preserved existing dirty/untracked work; no reset, clean, stash, discard, commit, push, or publication. Baseline remains CPython tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

Forced-fresh pre-change VC6/Wine probe confirmed the preceding `globals` declaration slice and identified the distinct `PyObject *module` declaration in `type_new_set_module()` as first blocker. Exact command: `mkdir -p build/cron-20261021-module-reprobe/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261021-module-reprobe/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261021-module-reprobe/probe.log 2>&1` — probe exit 2; summary `total=109 compiled=108 cached=0 skipped=0`. First diagnostics: `typeobject.c(2872)` C2275 (`PyObject` illegal use as expression) and C2065 (`module` undeclared). `_blake2/blake2s_impl.c` was not listed as a failure in the captured first diagnostic group. Wine emitted a long socket-path warning for repository-local `XDG_RUNTIME_DIR`; compilation continued. Capture: `build/cron-20261021-module-reprobe/probe.log`.

Hermes delegation was unavailable because the configured Anthropic provider has no credentials. Used the single authenticated Codex CLI lane (`codex-cli 0.153.4`, workspace-write/ephemeral), which followed strict TDD. New `scripts/vc6-typeobject-type-new-set-module-module-c89.test.py` failed against byte-verified unchanged production source (RED exit 1, expected opening-declaration assertion). The minimal source change declares `PyObject *module;` with the opening locals and converts the later initialized declaration to assignment exactly at its prior lookup point. The directly affected globals regression was narrowly updated to expect the new declaration while retaining ordering checks. Focused tests passed; all 50 `scripts/vc6-typeobject-*.test.py` regressions passed (exit 0). A full workspace snapshot check confirmed only those two tests and `cpython/Objects/typeobject.c` changed during implementation; pre-existing paths remained byte-identical. Outer `git diff --check` and nested `git -C cpython diff --check -- Objects/typeobject.c` exited 0.

After-change forced-fresh command: `mkdir -p build/cron-20261021-after-module/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261021-after-module/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261021-after-module/probe.log 2>&1` — probe exit 2; summary remains `total=109 compiled=108 cached=0 skipped=0`. Former `typeobject.c(2872)` diagnostics are gone. First remaining diagnostic family advances to `typeobject.c(2937)` C2143 on the distinct `const char *doc_str` declaration, with C2065 `doc_str` consequence at 2938; left untouched. Capture: `build/cron-20261021-after-module/probe.log`. Compiler-probe progress only: no `pythoncore`/`python.exe` link, Wine interpreter execution, or real Windows 98 SE execution occurred.

Files changed by this slice: `cpython/Objects/typeobject.c`, new `scripts/vc6-typeobject-type-new-set-module-module-c89.test.py`, narrowly adjusted `scripts/vc6-typeobject-type-new-set-module-globals-c89.test.py`, and this status entry. Next frontier: force-fresh confirm and isolate only the `type_new_set_doc()` `doc_str` declaration family. No completed port is claimed.

---
## Re-probe: current frontier is `type_new_classmethod()` (diagnostics only)

Date: 2026-10-25 UTC. The requested checkout `/home/ubuntu/projects/python-win9x` is absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read `PORT_STATUS.md`, `README.md`, and the installed legacy-toolchain reference at `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md`. Existing work remains preserved; no reset, clean, stash, discard, commit, push, or publication. CPython remains tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded prior frontier was stale: forced-fresh probe command `mkdir -p build/cron-current-frontier/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-current-frontier/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-current-frontier/probe.log 2>&1` returned exit 2. Summary: `total=109 compiled=108 cached=0 skipped=0`. The initial `_blake2/blake2s_impl.c` sequence compiled; first stable errors now occur at `cpython/Objects/typeobject.c(3001)`: C2275 (`PyObject`, illegal use of type as expression) and C2065 (`method`, undeclared identifier). Capture: `build/cron-current-frontier/probe.log`. `cpython/Modules/_blake2/blake2s_impl.c` already contains local changes in the existing dirty checkout; none were altered by this run.

Delegation prerequisite check found `/home/ubuntu/.local/bin/codex` and `/usr/bin/wine`, but no `MSVC600/VC98/bin/VCVARS32.BAT` at the expected path. The focused coding subagent could not start: delegation provider `anthropic` has no credentials. Accordingly no implementation/test slice was attempted. This is diagnostics-only; no linked `pythoncore`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution is verified. Next safe step: restore/check the VC6 environment prerequisite and run a single TDD slice for the `method` declaration at the actual frontier. No completed port is claimed.

---
## `type_new_classmethod()` method declaration C89 slice (frontier advances)

Date: 2026-10-24 UTC. Requested path `/home/ubuntu/projects/python-win9x` is absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read `PORT_STATUS.md`, `README.md`, and the CPython Win9x/MSVC6 reference before work. Preserved all existing dirty and untracked work; no reset, clean, stash, discard, commit, push, or publication. CPython baseline: `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

Forced-fresh before-change probe: `mkdir -p build/cron-20261024-reprobe/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261024-reprobe/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261024-reprobe/probe.log 2>&1` — exit 2; summary `total=109 compiled=108 cached=0 skipped=0`. First stable blocker: `typeobject.c(3001)` C2275 (`PyObject`) and C2065 (`method`) in `type_new_classmethod()`; later declaration families left untouched. Capture: `build/cron-20261024-reprobe/probe.log`.

Configured Hermes delegation provider was unavailable (Anthropic credentials missing); one authenticated Codex CLI lane (`codex-cli 0.153.4`, workspace-write/ephemeral) completed the focused implementation under TDD. New `scripts/vc6-typeobject-type-new-classmethod-c89.test.py` failed against unchanged production source (RED exit 1; expected late declaration condition). The sole source change hoists `PyObject *method;` to the function's opening local declarations and turns `PyObject *method = PyClassMethod_New(func);` into `method = PyClassMethod_New(func);` at its original evaluation point. No other defect family or existing regression fixture changed. Child reported source-delta/preservation checks exit 0.

Parent verification: `python3 scripts/vc6-typeobject-type-new-classmethod-c89.test.py` — exit 0; all 55 `scripts/vc6-typeobject-*.test.py` fixtures run individually — 55 passed, 0 failed, runner exit 0. Outer `git diff --check` and nested `git -C cpython diff --check -- Objects/typeobject.c` both exit 0. After-change forced-fresh command: `mkdir -p build/cron-20261024-after-classmethod/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261024-after-classmethod/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261024-after-classmethod/probe.log 2>&1` — exit 2. The former line-3001 diagnostics cleared; first remaining diagnostics are at `typeobject.c(3025)`, C2143 and cascading undeclared `i`, the distinct C99 loop-index family, left untouched. Full capture: `build/cron-20261024-after-classmethod/probe.log`.

Files changed by this slice: `cpython/Objects/typeobject.c`, new `scripts/vc6-typeobject-type-new-classmethod-c89.test.py`, and this status entry. Compiler-probe progress only: no `pythoncore`/`python.exe` link, Wine interpreter execution, or real Windows 98 SE execution occurred. Next frontier: fresh probe on the next run, then isolate only the verified `typeobject.c(3025)` loop-index family. No completed port is claimed.

---
## `type_new_get_bases()` empty-bases `new_bases` declaration slice

Date: 2026-10-21 UTC. The requested `/home/ubuntu/projects/python-win9x` checkout is absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read `PORT_STATUS.md`, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved all prior dirty and untracked work; no reset, clean, stash, discard, commit, push, or publication. Nested CPython baseline remains tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

Forced-fresh pre-change command: `mkdir -p build/cron-20261029-current-reprobe/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261029-current-reprobe/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261029-current-reprobe/probe.log 2>&1` — exit 2; summary `total=109 compiled=108 cached=0 skipped=0`. The first error family was actually `type_new_get_bases()` at `typeobject.c(3286)`, C2275 `PyObject` / C2065 `new_bases`; later C99 loop diagnostics at line 3294 were separate. Although the preceding status text labeled line 3286 as `type_new_impl()`, source and fresh diagnostics identify the correct function as `type_new_get_bases()`; the isolated slice below follows the actual source. Capture: `build/cron-20261029-current-reprobe/probe.log`.

One focused authenticated Codex CLI lane (`codex-cli 0.153.4`, workspace-write/ephemeral; no commit) followed strict TDD. New `scripts/vc6-typeobject-type-new-get-bases-new-bases-c89.test.py` failed against unchanged source (RED exit 1, expected declaration-placement assertion). The only production edit hoists `PyObject *new_bases;` to the start of the existing `if (nbases == 0)` block and makes the original allocation an assignment at the same point after `ctx->base` is set. Focused GREEN passed (exit 0); all 59 `scripts/vc6-typeobject-*.test.py` tests passed independently (exit 0). Snapshot check confirmed 258 pre-existing paths byte-identical and only the expected nested `typeobject.c` source delta plus new regression; `PORT_STATUS.md` was not changed by the coding lane. Nested and outer `git diff --check` both exited 0.

After-change forced-fresh command: `mkdir -p build/cron-20261029-after-new-bases/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261029-after-new-bases/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261029-after-new-bases/probe.log 2>&1` — exit 2; summary unchanged `total=109 compiled=108 cached=0 skipped=0`. Former line-3286 C2275/C2065 errors cleared. First current blocker is the distinct C99 `for (Py_ssize_t i...)` in `type_new_get_bases()` at `typeobject.c(3295)`, with dependent undeclared `i` and syntax diagnostics; untouched. Capture: `build/cron-20261029-after-new-bases/probe.log`.

Files changed by this slice: `cpython/Objects/typeobject.c`, new `scripts/vc6-typeobject-type-new-get-bases-new-bases-c89.test.py`, and this status entry. Compiler-probe progress only; no `pythoncore`/`python.exe` link, Wine interpreter execution, or real Windows 98 SE execution occurred. Next: fresh-confirm and isolate only the loop-index declaration at line 3295. No completed port is claimed.

---
## `type_new_get_bases()` loop-index C89 slice (frontier advances)

Date: 2026-10-29 UTC. The requested checkout `/home/ubuntu/projects/python-win9x` is absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before work. Preserved pre-existing changes; no reset, clean, stash, discard, commit, push, or publication. CPython baseline verified: tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

Forced-fresh pre-change VC6/Wine probe: `mkdir -p build/cron-20261029-current-reprobe/runtime; XDG_RUNTIME_DIR=/home/ubuntu/.hermes/profiles/maxwell/cache/scratch/wine-runtime WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261029-current-reprobe/probe.log 2>&1` — probe exit 2; summary `total=109 compiled=108 cached=0 skipped=0`. First stable family was `typeobject.c(3295)` C2143 on the C99 `for (Py_ssize_t i...)` initializer and dependent undeclared `i` / syntax diagnostics. Capture: `build/cron-20261029-current-reprobe/probe.log`.

One focused authenticated Codex CLI lane (`codex-cli 0.153.4`, workspace-write/ephemeral; no commit) followed strict TDD. New `scripts/vc6-typeobject-type-new-get-bases-index-c89.test.py` failed against unchanged production source (RED exit 1, expected opening declaration assertion); `cmp` against the pre-edit `typeobject.c` snapshot exited 0. The only production edit hoists `Py_ssize_t i;` into `type_new_get_bases()` after `nbases` and changes the loop initializer to `i = 0`, preserving bounds, increment, body, and behavior. The directly affected `scripts/vc6-typeobject-type-new-get-bases-new-bases-c89.test.py` was minimally updated to allow this separate declaration while retaining its allocation-order assertions. Focused test passed (exit 0); all 60 `scripts/vc6-typeobject-*.test.py` regressions passed (0 failures). Snapshot checks confirmed the production source differs only by the intended declaration/initializer change, the existing fixture by its narrow expected-prefix allowance, and `PORT_STATUS.md` was not modified during the delegated lane.

After-change forced-fresh probe: `mkdir -p build/cron-20261029-after-get-bases-index/runtime; XDG_RUNTIME_DIR=/home/ubuntu/.hermes/profiles/maxwell/cache/scratch/wine-runtime WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261029-after-get-bases-index/probe.log 2>&1` — probe exit 2; summary remains `total=109 compiled=108 cached=0 skipped=0`. The former line-3295 C2143/C2065 loop diagnostics cleared. First current diagnostic family advances to `typeobject.c(3301)` C2143 for the later `PyObject *mro_entries` declaration, followed by C2065 at 3303; left untouched. Additional late declarations at lines 3316 and 3336 remain distinct and untouched. Capture: `build/cron-20261029-after-get-bases-index/probe.log`.

Files changed by this slice: `cpython/Objects/typeobject.c`, new `scripts/vc6-typeobject-type-new-get-bases-index-c89.test.py`, narrowly updated `scripts/vc6-typeobject-type-new-get-bases-new-bases-c89.test.py`, and this status entry. Compiler-probe progress only: no `pythoncore`/`python.exe` link, Wine interpreter execution, or real Windows 98 SE execution occurred. Next frontier: force-fresh confirm and isolate only `type_new_get_bases()`'s `mro_entries` declaration. No completed port is claimed.

---
## `type_new_get_bases()` `mro_entries` C89 declaration slice (frontier advances)

Date: 2026-10-29 UTC. The requested checkout `/home/ubuntu/projects/python-win9x` is absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read `PORT_STATUS.md`, `README.md`, and the legacy-toolchain reference before work. Preserved all existing dirty/untracked work; no reset, clean, stash, discard, commit, push, or publication. CPython baseline verified as `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

Forced-fresh pre-change VC6/Wine probe: `mkdir -p build/cron-20261029-current-reprobe/runtime; XDG_RUNTIME_DIR=/home/ubuntu/.hermes/profiles/maxwell/cache/scratch/wine-runtime WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261029-current-reprobe/probe.log 2>&1` — exit 2; summary `total=109 compiled=108 cached=0 skipped=0`. First stable diagnostics were `typeobject.c(3301)` C2143 and `(3303)` C2065 `mro_entries`; later declaration families remain distinct. Capture: `build/cron-20261029-current-reprobe/probe.log`.

One focused authenticated Codex CLI lane (`codex-cli 0.153.4`, workspace-write, ephemeral; no commit) followed strict TDD. New `scripts/vc6-typeobject-type-new-get-bases-mro-entries-c89.test.py` failed against unchanged production source (RED exit 1: `mro_entries must precede loop statements (C89)`); a byte comparison confirmed source unchanged before implementation. The sole production edit moved `PyObject *mro_entries;` directly after the `base` declaration and before the type-check statement. Attribute lookup remains after the type check, preserving evaluation/control-flow order. Focused regression passed (exit 0), and all 61 `scripts/vc6-typeobject-*.test.py` scripts passed individually. Snapshot verification confirmed pre-existing dirty/untracked paths, including `PORT_STATUS.md`, remained unchanged during the coding lane.

After-change forced-fresh probe: `mkdir -p build/cron-20261029-after-mro-entries/runtime; XDG_RUNTIME_DIR=/home/ubuntu/.hermes/profiles/maxwell/cache/scratch/wine-runtime WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261029-after-mro-entries/probe.log 2>&1` — exit 2; summary remains `total=109 compiled=108 cached=0 skipped=0`. The former line-3301/3303 diagnostics cleared. First current blocker advances to `typeobject.c(3316)` C2275/C2065 for the separate `PyTypeObject *winner` declaration; related errors at 3323/3325 are cascading. Left untouched. Capture: `build/cron-20261029-after-mro-entries/probe.log`. Focused test rerun passed (exit 0); outer and nested `git diff --check` both exited 0.

Files changed by this slice: `cpython/Objects/typeobject.c`, new `scripts/vc6-typeobject-type-new-get-bases-mro-entries-c89.test.py`, and this status entry. Compiler-probe progress only; no `pythoncore`/`python.exe` link, Wine interpreter execution, or real Windows 98 SE execution occurred. Next: force-fresh confirm and isolate only the `winner` declaration family. No completed port is claimed.

---
## `type_new_get_bases()` `winner` C89 declaration slice (frontier advances)

Date: 2026-10-21 UTC. Requested checkout `/home/ubuntu/projects/python-win9x` is absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read `PORT_STATUS.md`, `README.md`, and the CPython Win9x/MSVC6 reference before work. Preserved all pre-existing dirty/untracked work; no reset, clean, stash, discard, commit, push, or publication. CPython baseline verified as tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

Forced-fresh pre-change VC6/Wine command: `mkdir -p build/cron-20261030-current-reprobe/runtime; XDG_RUNTIME_DIR=/home/ubuntu/.hermes/profiles/maxwell/cache/scratch/wine-runtime WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261030-current-reprobe/probe.log 2>&1` — probe exit 2; summary `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First stable diagnostics were `typeobject.c(3316)` C2275 (`PyTypeObject`) and C2065 (`winner`), with cascading C2223 at 3323/3325. The next distinct `base` declaration at 3336 was left untouched. Capture: `build/cron-20261030-current-reprobe/probe.log`.

Hermes delegation provider could not start (no Anthropic credentials); one authenticated Codex CLI lane (`codex-cli 0.153.4`, ChatGPT auth, workspace-write/ephemeral) followed strict TDD. New `scripts/vc6-typeobject-type-new-get-bases-winner-c89.test.py` failed against unchanged source with the expected declaration-placement assertion (RED exit 1). The minimal production edit moved only `PyTypeObject *winner;` to the function's opening declaration block; its assignment remains at the original evaluation point. Three directly affected `type_new_get_bases()` tests had narrow declaration/block-boundary expectation changes. Focused test passed (exit 0); all 62 `scripts/vc6-typeobject-*.test.py` tests passed, individually (0 failures). Preservation snapshot verified all 11,474 other pre-existing files byte-identical, with only the intended source and three directly affected test fixtures changed, plus the new focused test; no deletions and no staged changes. Outer and nested `git diff --check` and `git diff --cached --check` all exited 0. Codex's first attempted insertion matched a similar declaration block in another function; the applicable tests detected it, and it was corrected before final verification. No unrelated change was retained.

Forced-fresh after-change command: `mkdir -p build/cron-20261030-after-winner/runtime; XDG_RUNTIME_DIR=/home/ubuntu/.hermes/profiles/maxwell/cache/scratch/wine-runtime WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261030-after-winner/probe.log 2>&1` — probe exit 2; summary remains `total=109 compiled=108 cached=0 skipped=0`; former line-3316 winner errors cleared. First stable blocker advances to `typeobject.c(3336)` C2275 (`PyTypeObject`) and C2065 (`base`), with distinct later errors beginning at line 3354. Capture: `build/cron-20261030-after-winner/probe.log`. Focused test rerun and both outer/nested diff checks exited 0.

Files changed by this slice: `cpython/Objects/typeobject.c`; new `scripts/vc6-typeobject-type-new-get-bases-winner-c89.test.py`; narrowly updated `scripts/vc6-typeobject-type-new-get-bases-index-c89.test.py`, `scripts/vc6-typeobject-type-new-get-bases-mro-entries-c89.test.py`, and `scripts/vc6-typeobject-type-new-get-bases-new-bases-c89.test.py`; and this status entry. Compiler-probe progress only: no `pythoncore`/`python.exe` link, Wine interpreter execution, or real Windows 98 SE execution occurred. Next frontier: force-fresh confirm and isolate only the `type_new_get_bases()` `base` declaration at line 3336. No completed port is claimed.

---
## Diagnostics-only: `type_new_ctx` initializer frontier verified; delegated lane pending

Date: 2026-10-22 UTC. The requested checkout `/home/ubuntu/projects/python-win9x` is absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read `PORT_STATUS.md`, `README.md`, and the profile CPython Win9x/MSVC6 reference before work. Preserved the dirty tree; no reset, clean, stash, discard, commit, push, or publication. CPython baseline verified as tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

Forced-fresh VC6/Wine reprobe command: `mkdir -p build/cron-20261022-reprobe-blake/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261022-reprobe-blake/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261022-reprobe-blake/probe.log 2>&1` — exit 2, but the path exceeded the AF_UNIX socket limit (108 bytes), so reran with short runtime path: `mkdir -p /home/ubuntu/r; XDG_RUNTIME_DIR=/home/ubuntu/r WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261022-reprobe-blake/probe-retry.log 2>&1` — exit 2. `_blake2/blake2s_impl.c` compiled. First stable diagnostics reconfirm the recorded frontier at `typeobject.c(3365)`: C2275 (`type_new_ctx`), C2146 before `ctx`, C2065 `ctx`, and C2059 at `{`. The distinct next diagnostic family begins at line 3379 (`PyObject *type`) and is untouched. Capture: `build/cron-20261022-reprobe-blake/probe-retry.log`.

One Hermes coding subagent attempt failed because Anthropic credentials are unavailable. A single authenticated Codex CLI 0.153.4 lane was started (`codex exec --sandbox workspace-write --ephemeral`, process id 1360911); its TDD implementation result has not yet been retrieved. No implementation is claimed in this record. Probe progress only; no `pythoncore`/`python.exe` link, Wine interpreter execution, or real Windows 98 SE execution occurred. Current observed outer status count was 135 dirty/untracked entries. Next frontier: complete the isolated TDD slice for the initializer only if the delegated lane returns and independent verification passes; otherwise report the delegation blocker. No completed port is claimed.

---
## Diagnostics-only: current `type_new_ctx` failure is a late local declaration

Date: 2026-10-22 04:14 UTC. The requested `/home/ubuntu/projects/python-win9x` checkout is absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read this file, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md` before acting. Preserved all pre-existing dirty/untracked work; no reset, clean, stash, discard, commit, push, or publication. CPython baseline verified as tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded `_blake2/blake2s_impl.c` frontier is stale. Forced-fresh command: `mkdir -p build/cron-20261022-current-reprobe/runtime; XDG_RUNTIME_DIR=/home/ubuntu/r WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261022-current-reprobe/probe.log 2>&1` — exit 2; summary `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First stable errors in `cpython/Objects/typeobject.c(3365)` are C2275 `type_new_ctx` illegal use as expression, C2146 missing `;` before `ctx`, C2065 undeclared `ctx`, and C2059 at `{`; subsequent `.metatype`/`.args`/etc. C2224 errors cascade. Full capture: `build/cron-20261022-current-reprobe/probe.log`.

One focused coding-agent lane was attempted. Hermes delegation was unavailable because the configured Anthropic provider has no credentials; authenticated `codex-cli 0.153.4` inspected the workspace and stopped without edits because `cpython/Objects/typeobject.c` already has the `{0}` initializer plus explicit field assignments, and `scripts/vc6-typeobject-type-new-ctx-c89.test.py` already exists. Its test checks the initializer's C89 compilation and 13 field values, but does not enforce declaration-before-statements: `type_new_ctx ctx` remains introduced after executable statements. No RED test was run; no files changed by the coding lane. Parent ran `python3 scripts/vc6-typeobject-type-new-ctx-c89.test.py` — exit 0 — and all 65 `scripts/vc6-typeobject-*.test.py` scripts — 65 passed, 0 failed. This evidence indicates the next defect family is the late local declaration, distinct from the already replaced designated initializer. To avoid claiming an unsupported initializer diagnosis or weakening TDD by reusing an already-passing test, no production edit was made this run.

Files changed this run: `PORT_STATUS.md` only. This remains compiler-probe progress; no `pythoncore`/`python.exe` link, Wine interpreter execution, or real Windows 98 SE execution occurred. Next frontier: strict-TDD isolate only the late `type_new_ctx ctx` declaration (test must assert it is in the opening declaration block, fail against the current source, then verify minimal hoist/assignment behavior), followed by a forced-fresh VC6 probe. No completed port is claimed.

---
## Diagnostics-only: `type_new()` context declaration blocker confirmed; coding lane unavailable

Date: 2026-10-22 UTC. The requested checkout `/home/ubuntu/projects/python-win9x` is absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read `PORT_STATUS.md`, `README.md`, and the active-profile CPython Win9x/MSVC6 reference before probing. The working tree already contains extensive local changes, including a pre-existing untracked `scripts/vc6-typeobject-type-new-ctx-c89.test.py` and modifications to `cpython/Objects/typeobject.c`; preserved these and all other work. No reset, clean, stash, discard, commit, push, or publication. CPython baseline verified as tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

Forced-fresh probe command: `mkdir -p /home/ubuntu/r build/cron-20261022T061658Z-frontier-reprobe; XDG_RUNTIME_DIR=/home/ubuntu/r WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261022T061658Z-frontier-reprobe/probe.log 2>&1` — exit 2; summary `total=109 compiled=108 cached=0 skipped=0`. First stable diagnostic group is `typeobject.c(3365)`: C2275 on `type_new_ctx`, C2146 missing `;` before `ctx`, C2065 undeclared `ctx`, and C2059 at `{`; subsequent field-access diagnostics cascade. This is consistent with the declaration occurring after statements in `type_new()`. Exact capture: `build/cron-20261022T061658Z-frontier-reprobe/probe.log`.

The requested single coding-agent lane was attempted but Hermes delegation could not start because the configured Anthropic provider has no credentials. Following the specified one-lane limit and delegation fallback rules, did not start another external coding CLI lane. No production or regression source was changed this run. The pre-existing `scripts/vc6-typeobject-type-new-ctx-c89.test.py` was run and passed (exit 0; it compiles/runs a C89 context field-value fixture), but this does not test declaration placement and is not a TDD RED/GREEN cycle. The nested diff shows `cpython/Objects/typeobject.c` already contains a local `type_new_ctx ctx = {0};` followed by field assignments; this existing user modification was preserved. `git -C cpython diff --check -- Objects/typeobject.c` exited 0.

Files changed this run: `PORT_STATUS.md` only. This is compiler-probe progress only: no pythoncore/python.exe link, Wine interpreter execution, or real Windows 98 SE execution occurred. Next frontier: hoist only the `type_new_ctx ctx` declaration into the opening local declaration block of `type_new()` while preserving initialization and field assignments at their current execution point; first add a placement regression and observe RED. No completed port is claimed.

---
## Diagnostics-only: `type_new_ctx` frontier reconfirmed; no safe implementation lane

Date: 2026-10-22 UTC. The requested checkout `/home/ubuntu/projects/python-win9x` is absent; operated in `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read `PORT_STATUS.md`, `README.md`, and the profile skill reference `python-3-win9x-msvc6.md`. Preserved the pre-existing dirty/untracked workspace; no reset, clean, stash, discard, commit, push, or publication. CPython baseline is tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The recorded `type_new_ctx` frontier remains current. Forced-fresh probe command: `mkdir -p build/cron-20261022-frontier-reprobe/runtime; XDG_RUNTIME_DIR=/home/ubuntu/.hermes/profiles/maxwell/cache/scratch/wine-runtime WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261022-frontier-reprobe/probe.log 2>&1` — exit 2; summary `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First stable diagnostics reconfirm at `cpython/Objects/typeobject.c(3365)`: C2275 `type_new_ctx`, C2146 before `ctx`, C2065 `ctx`, C2059 at `{`, then cascading field errors. Complete capture: `build/cron-20261022-frontier-reprobe/probe.log`.

Coding lane prerequisites: `codex-cli 0.153.4` is installed/authenticated (`codex login status`: “Logged in using ChatGPT”), but the checkout has substantial local modifications and untracked tests (136 outer status entries before this entry; nested CPython also dirty). The external VC6 bundle prerequisite is absent at `MSVC600/VC98/bin/VCVARS32.BAT`. An isolated clean worktree would not contain the live compatibility/test frontier, and shared-checkout autonomous edits cannot be safely isolated from the existing work. Therefore no coding agent was launched and no implementation or regression test was changed/run. This is diagnostics-only, not a claimed TDD cycle.

Files changed this run: `PORT_STATUS.md` only. Compiler-probe progress only; no `pythoncore`/`python.exe` link, Wine interpreter execution, or real Windows 98 SE execution. Next frontier remains narrowly scoped: add a placement-focused RED regression for the `type_new_ctx ctx` declaration, then hoist only that declaration if a safe coding lane and usable compiler bundle are available; preserve initialization/field assignments at their execution point. No completed port is claimed.

---
## Diagnostics-only: current frontier still `type_new_ctx ctx`; VC6 toolchain absent

Date: 2026-10-22 UTC. Requested checkout `/home/ubuntu/projects/python-win9x` is absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read `PORT_STATUS.md`, `README.md`, and the active-profile `python-3-win9x-msvc6.md` reference before work. Preserved all pre-existing modified and untracked paths; no reset, clean, stash, discard, commit, push, or publication. CPython baseline verified: tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The `_blake2/blake2s_impl.c` sequence is stale as a blocker: the forced-fresh probe compiled that source, then reproduced the current first stable compiler diagnostics at `cpython/Objects/typeobject.c(3365)`: C2275 for `type_new_ctx`, C2146 before `ctx`, C2065 undeclared `ctx`, and C2059 at `{`; subsequent field/type errors are cascades. Exact command: `mkdir -p build/cron-20261023-current-frontier-reprobe; XDG_RUNTIME_DIR=/home/ubuntu/.hermes/profiles/maxwell/cache/scratch/wine-runtime WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261023-current-frontier-reprobe/probe.log 2>&1` — probe exit 2; `total=109 compiled=108 cached=0 skipped=0`. Capture: `build/cron-20261023-current-frontier-reprobe/probe.log`.

No implementation/TDD lane was launched: required external compiler bundle path `MSVC600/VC98/bin/VCVARS32.BAT` is absent, so the requested focused VC6 verification cannot currently be run. This workspace already has extensive unrelated dirty/untracked state (137 outer status entries); all was preserved. No source or test files changed. `PORT_STATUS.md` is the only tracked file changed by this diagnostics run. Compiler-probe progress only; no `pythoncore`/`python.exe` link, Wine interpreter execution, or real Windows 98 SE execution. Next frontier remains investigate a C89-compatible `type_new_ctx ctx` declaration/initialization split only once the VC6 toolchain is restored, then run the focused probe and applicable regressions. No completed port is claimed.

---
## Diagnostics-only: `type_new_ctx` frontier reconfirmed; VC6 bundle unavailable

Date: 2026-10-30 UTC. The requested checkout `/home/ubuntu/projects/python-win9x` is absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read `PORT_STATUS.md`, `README.md`, and `/home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md`. Preserved all existing work; no reset, clean, stash, discard, commit, push, or publication. Nested CPython remains exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

Re-probed the actual frontier using `XDG_RUNTIME_DIR=/home/ubuntu/.hermes/profiles/maxwell/cache/scratch/wine-runtime WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261030-frontier-recheck/probe.log 2>&1` — exit 2. Forced-fresh source-list summary: `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First stable diagnostics reconfirm `cpython/Objects/typeobject.c(3365)`: C2275 `type_new_ctx`, C2146 before `ctx`, C2065 `ctx`, C2059 at `{`; subsequent field/other C99 errors are cascading or later blockers. Full capture: `build/cron-20261030-frontier-recheck/probe.log`.

The required local compiler launcher `MSVC600/VC98/bin/VCVARS32.BAT` is absent (file check exit 1), so this environment cannot run the required focused VC6 probe after an edit. No implementation or regression test was changed, no subagent was delegated, and no regression suite was run. Files changed by this run: `PORT_STATUS.md` only. This is compiler-probe progress only; no `pythoncore`/`python.exe` link, Wine interpreter execution, or real Windows 98 SE execution. Next frontier: restore/provide the external MSVC600 bundle/launcher, then TDD the declaration-placement defect with a focused regression, run that test and applicable regressions, and verify using a forced-fresh VC6 probe. No completed port is claimed.

---


## 2026-10-24: `PyType_FromModuleAndSpec` `s` C89 declaration slice (compiler frontier advances)

Worked in `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. CPython baseline: exact tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`; outer HEAD `35caf1a558e6b2c5bf501894d8972f8b0dd828a6`. Fresh pre-change capture `build/cron-20261024-frontier-reprobe/probe.log`: exit 2, `total=109 compiled=108 cached=0 skipped=0`; first errors `(3493)` C2143 before `const`, then `(3494)` C2065 `s`. Earlier `memb` blocker cleared.

Strict TDD: added `scripts/vc6-typeobject-from-module-and-spec-s-c89.test.py` before production edits. RED command `python3 scripts/vc6-typeobject-from-module-and-spec-s-c89.test.py` exited 1 at the expected opening-declaration assertion. Minimal production change in `cpython/Objects/typeobject.c`: declared `const char *s;` in the opening locals and changed the late initialized declaration to `s = strrchr(spec->name, '.');` at the original execution point. The initial GREEN attempt uncovered an over-broad test count (there are two `strrchr` uses elsewhere in the function); narrowed the assertion to the name-setup region. Corrected focused regression passed (exit 0), and all 70 `scripts/vc6-typeobject-*.test.py` tests passed (exit 0 each).

Compiler banner independently verified under Wine with `cl`: `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`; command exit 0. Forced-fresh post-change probe command:
```sh
mkdir -p build/cron-20261024-after-slice/runtime; XDG_RUNTIME_DIR="$PWD/build/cron-20261024-after-slice/runtime" WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261024-after-slice/probe.log 2>&1
```
Probe exit 2; summary `total=109 compiled=108 cached=0 skipped=0`. Former line-3493/3494 errors cleared. First remaining stable errors: `typeobject.c(3517)` C2275 `Py_ssize_t`, C2146 before `name_buf_len`, C2065 `name_buf_len`; later `size_t len`/`tp_doc` diagnostics are separate and untouched. The first attempted post-change probe failed before compilation due Wine server lock setup; retry with the repo-local runtime directory above compiled 108 entries and established the source frontier. Captures: `build/cron-20261024-after-slice/probe.log`, `compiler-banner-plain.log`; initial failed attempt under `s-local/`.

Scoped `git diff --check -- PORT_STATUS.md scripts/vc6-typeobject-from-module-and-spec-s-c89.test.py` and `git -C cpython diff --check -- Objects/typeobject.c` passed (exit 0). Preservation snapshot check confirmed all unrelated existing dirty/untracked files byte-for-byte unchanged. Files changed by this slice: `cpython/Objects/typeobject.c`, new `scripts/vc6-typeobject-from-module-and-spec-s-c89.test.py`, and `PORT_STATUS.md`; diagnostic outputs are under `build/cron-20261024-after-slice/`. No reset, clean, stash, discard, commit, push, or publication. Compiler-probe progress only: no linked `pythoncore`/`python.exe`, no interpreter execution under Wine, and no Windows 98 SE execution. Next frontier: fresh-confirm and isolate only the `Py_ssize_t name_buf_len` declaration family at line 3517. No completed port is claimed.
## `PyType_FromModuleAndSpec()` `name_buf_len` C89 declaration slice (frontier advances)

Date: 2026-10-24 UTC. The requested `/home/ubuntu/projects/python-win9x` checkout is absent; worked in `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read `PORT_STATUS.md`, `README.md`, and the active-profile `python-3-win9x-msvc6.md` reference before acting. CPython baseline verified at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`. Preserved existing work; no reset, clean, stash, discard, commit, push, or publication.

Forced-fresh pre-change command: `mkdir -p /home/ubuntu/r; XDG_RUNTIME_DIR=/home/ubuntu/r WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261024-blake2-frontier/probe.log 2>&1` — exit 2; summary `total=109 compiled=108 cached=0 skipped=0`. `_blake2/blake2s_impl.c` compiled. First stable diagnostic family: `cpython/Objects/typeobject.c(3517)` C2275 `Py_ssize_t`, C2146 before `name_buf_len`, and C2065 undeclared `name_buf_len`. Initial invocation using repository-local `XDG_RUNTIME_DIR` failed before compilation because the generated Unix socket path exceeded 108 bytes; rerun with `/home/ubuntu/r` succeeded. Full capture: `build/cron-20261024-blake2-frontier/probe.log`.

One focused authenticated Codex CLI lane (`codex-cli 0.153.4`, workspace-write/ephemeral) used strict TDD, preserved unrelated changes, and did not edit this status. New `scripts/vc6-typeobject-from-module-and-spec-name-buf-len-c89.test.py` failed against unchanged production source (RED exit 1, expected opening-declaration assertion). The only production change hoists `Py_ssize_t name_buf_len;` into `PyType_FromModuleAndSpec()`'s opening declarations and replaces the initialized late declaration with an assignment at the same evaluation point. No existing fixture required changes. Focused regression passed; all 71 `scripts/vc6-typeobject-*.test.py` tests passed individually (0 failures). Outer and nested `git diff --check` both exited 0. Delegated snapshot verification reported 4,887 pre-existing files unchanged except the intended `cpython/Objects/typeobject.c` delta; independently verified focused/all tests and diff checks.

Forced-fresh after-change command: `mkdir -p /home/ubuntu/r; XDG_RUNTIME_DIR=/home/ubuntu/r WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261024-after-name-buf-len.log 2>&1` — exit 2; summary remains `total=109 compiled=108 cached=0 skipped=0`. Former line-3517 diagnostics cleared. First remaining stable diagnostic is `typeobject.c(3605)` C2275 `size_t`, followed by C2146 before `len`, C2065 `len`, then C2143/C2065 involving `tp_doc`; this distinct next declaration family is untouched. Capture: `build/cron-20261024-after-name-buf-len.log`.

Files changed by this slice: `cpython/Objects/typeobject.c` (among pre-existing local edits), new `scripts/vc6-typeobject-from-module-and-spec-name-buf-len-c89.test.py`, and this status record. This is compile-frontier progress only: no linked `pythoncore`/`python.exe`, Wine interpreter execution, or Windows 98 SE execution. Next: force-fresh confirm and isolate only the `typeobject.c(3605)` `size_t len` declaration family. No completed port is claimed.

---
## `PyType_FromModuleAndSpec()` `Py_tp_doc` C89 declaration slice (frontier advances)

Date: 2026-10-24 07:36 UTC. Requested checkout `/home/ubuntu/projects/python-win9x` is absent; worked in `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read `PORT_STATUS.md`, `README.md`, and the CPython Win9x/MSVC6 reference first. Preserved all existing local changes and untracked paths; no reset, clean, stash, discard, commit, push, or publication. CPython baseline remains tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

Fresh forced probe before edits: `mkdir -p /home/ubuntu/r build/cron-20260604-reprobe; XDG_RUNTIME_DIR=/home/ubuntu/r WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20260604-reprobe/probe.log 2>&1` — probe exit 2; summary `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First stable family was `typeobject.c(3605)` C2275 `size_t` / C2146 `len` / C2065 `len`, followed by line 3606 C2143/C2065 `tp_doc`. Capture: `build/cron-20260604-reprobe/probe.log`.

One authenticated Codex CLI lane (`codex-cli 0.153.4`, workspace-write/ephemeral) followed strict TDD. New `scripts/vc6-typeobject-from-module-and-spec-doc-c89.test.py` failed before production edit as expected (RED exit 1: `len and tp_doc must be declared at the start ... (C89)`). It hoisted only `size_t len;` and `char *tp_doc;` to the opening of the `Py_tp_doc` branch and converted the original initialized declarations to assignments at their original evaluation points. NULL guard, length/allocation order, failure handling, and copy remain unchanged. Focused GREEN passed (exit 0); all 72 `scripts/vc6-typeobject-*.test.py` tests passed (exit 0). Preservation verification confirmed only `cpython/Objects/typeobject.c` changed among prior snapshotted files; only the focused test was added. Outer and nested `git diff --check` passed (exit 0).

Forced-fresh after-change command: `mkdir -p /home/ubuntu/r build/cron-20260604-after-doc; XDG_RUNTIME_DIR=/home/ubuntu/r WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20260604-after-doc/probe.log 2>&1` — probe exit 2; summary `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. Former diagnostics at lines 3605–3607 cleared. First stable blocker advances to `typeobject.c(3756)` C2275 `PyHeapTypeObject` / C2065 `et`, with later cascading member access; left untouched. Full capture: `build/cron-20260604-after-doc/probe.log`.

Files changed by this slice: `cpython/Objects/typeobject.c`, new `scripts/vc6-typeobject-from-module-and-spec-doc-c89.test.py`, and this status record. Compiler-probe progress only: no linked `pythoncore`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution. Next frontier: fresh-confirm and isolate only the `PyHeapTypeObject *et` declaration family at line 3756. No completed port is claimed.

---
## `PyType_GetModuleByDef()` `n` C89 declaration slice (frontier advances)

Date: 2026-10-24 UTC. The requested checkout `/home/ubuntu/projects/python-win9x` is absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read this status, `README.md`, and the CPython Win9x/MSVC6 reference before acting. Preserved all pre-existing modified and untracked work; no reset, clean, stash, discard, commit, push, or publication. CPython baseline verified: tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

Forced-fresh pre-change probe: `mkdir -p build/cron-20261024-refresh-20261024; XDG_RUNTIME_DIR=/home/ubuntu/.hermes/profiles/maxwell/cache/scratch/wine-runtime WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261024-refresh-20261024/probe.log 2>&1` — exit 2; summary `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First current stable diagnostic family in `PyType_GetModuleByDef()` was line 3797 C2275 `Py_ssize_t`, C2146 before `n`, and C2065 `n`; the following C99 loop initializer `i` was a separate blocker. Capture: `build/cron-20261024-refresh-20261024/probe.log`.

One authenticated Codex CLI lane (`codex-cli 0.153.4`, workspace-write/ephemeral) followed strict TDD while preserving all pre-existing work. New `scripts/vc6-typeobject-get-module-by-def-n-c89.test.py` failed against unchanged production source (RED exit 1 at the expected opening-declaration assertion; `cmp` confirmed `typeobject.c` unchanged). The only production change hoists `Py_ssize_t n;` into the opening declaration block and changes the later initialized declaration to `n = PyTuple_GET_SIZE(mro);`, retaining evaluation timing. Directly coupled `scripts/vc6-typeobject-get-module-by-def-mro-c89.test.py` expectations were updated narrowly. Focused regression passed (exit 0); all 75 `scripts/vc6-typeobject-*.test.py` tests passed (exit 0). Snapshot verification confirmed only those two fixture/source paths changed during the lane and `PORT_STATUS.md` remained unchanged. No commit or publication.

Forced-fresh after-change probe: `mkdir -p build/cron-20261024-after-n/runtime; XDG_RUNTIME_DIR=/home/ubuntu/.hermes/profiles/maxwell/cache/scratch/wine-runtime WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261024-after-n/probe.log 2>&1` — exit 2; summary remains `total=109 compiled=108 cached=0 skipped=0`. The `n` diagnostics cleared; first remaining blocker is the separate C99 loop index `i` at `typeobject.c(3799)`, C2143/C2065 and dependent syntax errors, left untouched. Capture: `build/cron-20261024-after-n/probe.log`.

Files changed by this slice: `cpython/Objects/typeobject.c`, new `scripts/vc6-typeobject-get-module-by-def-n-c89.test.py`, updated `scripts/vc6-typeobject-get-module-by-def-mro-c89.test.py`, and this status entry. Compiler-probe progress only: no linked `pythoncore`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution. Next frontier: force-fresh confirm and isolate only `PyType_GetModuleByDef()`'s loop-index `i`. No completed port is claimed.

---
## Diagnostics-only: forced-fresh probe advances within `_PyType_GetSubclasses()`

Date: 2026-10-25 UTC. The requested `/home/ubuntu/projects/python-win9x` path is absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read `PORT_STATUS.md`, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md`. Preserved all pre-existing modifications/untracked files; no reset, clean, stash, discard, commit, push, or publication. CPython baseline verified: tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

Forced-fresh command: `mkdir -p /home/ubuntu/r build/cron-20261118-current-reprobe; XDG_RUNTIME_DIR=/home/ubuntu/r WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261118-current-reprobe/probe.log 2>&1` — exit 2; `_blake2/blake2s_impl.c` compiled. Former `subclasses` diagnostics are clear; the first stable errors now reach `_PyType_GetSubclasses()` `Py_ssize_t i` at `typeobject.c(4223)` (C2275/C2146/C2065). Later `ref`/`obj` declaration diagnostics remain distinct and untouched. Capture: `build/cron-20261118-current-reprobe/probe.log`.

One focused coding delegation was attempted but could not start: configured Anthropic credentials are unavailable. No implementation or regression test was changed; no regression suite was run. The scoped source/test changes were not appropriate without a coding lane, and the existing `scripts/vc6-object-c89.test.py` change/untracked object tests are unrelated local work and remain untouched. Files changed by this diagnostic run: this `PORT_STATUS.md` entry only; compiler output is a build artifact. Compiler-probe progress only: no `pythoncore`/`python.exe` link, Wine interpreter execution, or Windows 98 SE execution. Next: use an available authenticated focused coding lane for strict-TDD isolation of only `_PyType_GetSubclasses()` loop-index `i`, then rerun applicable regressions and a forced-fresh VC6 probe. No completed port is claimed.

---



---

## `_PyType_GetSubclasses()` `ref` C89 declaration slice

Date: 2026-10-26 UTC. The requested checkout `/home/ubuntu/projects/python-win9x` is absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Before edits, read `PORT_STATUS.md`, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md`. CPython baseline verified as tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`. Preserved pre-existing dirty/untracked state; no reset, clean, stash, discard, commit, push, or publication. Hermes delegation failed before launch due missing Anthropic credentials; used one authenticated Codex CLI 0.153.4 focused lane.

Forced-fresh pre-change compiler probe: `XDG_RUNTIME_DIR=/home/ubuntu/r WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261026-run/probe.log 2>&1` — exit 2; `_blake2/blake2s_impl.c` compiled; first stable diagnostics at `typeobject.c(4225)` C2275 `PyObject` and C2065 `ref`, then `obj` at 4228. Capture: `build/cron-20261026-run/probe.log`.

Strict TDD: new `scripts/vc6-typeobject-get-subclasses-ref-c89.test.py` failed against unchanged production source (RED exit 1, expected opening-declaration assertion). The only production change in this slice hoists `PyObject *ref;  // borrowed ref` to `_PyType_GetSubclasses()`'s opening declarations and removes its former late declaration; it has no initializer, so no assignment was required. `PyDict_Next` and use timing remain unchanged. The existing coupled `get-subclasses-index` and `get-subclasses-subclasses` test expectations were narrowly updated. Focused test passed (exit 0); all 84 `scripts/vc6-typeobject-*.test.py` passed (exit 0). Nested source and outer affected-fixture `git diff --check` passed (exit 0). Snapshot verification confirmed all previously dirty/untracked paths unchanged during the delegated implementation.

Forced-fresh post-change probe: `XDG_RUNTIME_DIR=/home/ubuntu/r WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261026-after-ref/probe.log 2>&1` — exit 2; `_blake2/blake2s_impl.c` compiled. Former `ref` diagnostics cleared; first remaining blocker is the separate late `PyObject *obj` declaration at `typeobject.c(4228)` (C2143), followed by undeclared `obj` at 4229. Left untouched.

Files changed by this slice: `cpython/Objects/typeobject.c`, new `scripts/vc6-typeobject-get-subclasses-ref-c89.test.py`, narrowly updated `scripts/vc6-typeobject-get-subclasses-index-c89.test.py` and `scripts/vc6-typeobject-get-subclasses-subclasses-c89.test.py`, and this status record. Compiler-probe progress only: no linked `pythoncore`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution. Next frontier: fresh-confirm and isolate only `_PyType_GetSubclasses()`'s `obj` declaration. No completed port is claimed.
## Diagnostics-only: `type_new_ctx` frontier stale; probe now fails later in `typeobject.c`

Date: 2026-10-26 UTC. The requested `/home/ubuntu/projects/python-win9x` is absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read `PORT_STATUS.md`, `README.md`, and the legacy-toolchain CPython/MSVC6 reference. Preserved all existing work (extensive modified/untracked paths); no reset, clean, stash, discard, commit, push, or publication. CPython baseline verified: tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`.

The prior recorded `type_new_ctx` frontier at line 3365 is stale: forced-fresh probe `mkdir -p build/cron-20261026-current-reprobe; XDG_RUNTIME_DIR=/home/ubuntu/.hermes/profiles/maxwell/cache/scratch/wine-runtime WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261026-current-reprobe/probe.log 2>&1` returned probe exit 2 with `total=109 compiled=108 cached=0 skipped=0`; that line no longer appears as an error. `_blake2/blake2s_impl.c` is included among the successfully compiled entries. The first stable diagnostics currently reported by the project source-list probe are in `cpython/Objects/typeobject.c(4897)`: C2275 `PyTypeObject` and C2065 undeclared `newto`; later diagnostics include C89 mixed declarations throughout the file and the compiler's 100-error cutoff. Full capture: `build/cron-20261026-current-reprobe/probe.log`.

The expected local launcher `MSVC600/VC98/bin/VCVARS32.BAT` is absent (test exit 1). No coding subagent was launched and no source/test implementation changes were made: post-edit focused VC6 validation cannot be established safely without the local toolchain prerequisite. This is diagnostics-only, not a TDD cycle. Files changed by this run: `PORT_STATUS.md` only; probe log is an untracked build artifact. No regression suite was run.

Compiler-probe progress only; no linked `pythoncore`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution. Next frontier: restore the external MSVC600 bundle, then fresh-confirm and test-first address only the actual first blocker in `typeobject.c` (currently `newto` at 4897). No completed port is claimed.

---

## `object_set_class()` `newto` C89 declaration slice (frontier advances)

Date: 2026-10-26 16:07 UTC. User-requested `/home/ubuntu/projects/python-win9x` is absent; used `/home/ubuntu/Organized/Legacy-Ports/Projects/python-win9x`. Read this status, `README.md`, and `skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md`. CPython baseline verified at tag `v3.11.16`, commit `41388c9cb160d0886d5ca00d2e6c8782608a4549`. Preserved the extensive existing dirty/untracked state; no reset, clean, stash, discard, commit, push, or publication.

The requested `_blake2/blake2s_impl.c` condition is stale. Forced-fresh pre-change command: `mkdir -p /home/ubuntu/r build/cron-20261026-run; XDG_RUNTIME_DIR=/home/ubuntu/r WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261026-run/probe.log 2>&1` — exit 2; summary `total=109 compiled=108 cached=0 skipped=0`; `_blake2/blake2s_impl.c` compiled. First stable diagnostics were `cpython/Objects/typeobject.c(4897)` C2275 `PyTypeObject` and C2065 `newto`, followed by cascading `newto->tp_flags` errors. Full capture: `build/cron-20261026-run/probe.log`.

Hermes coding delegation was attempted once and failed before launch because Anthropic credentials are unavailable. Following the coding-agent-delegation fallback, authenticated Codex CLI 0.153.4 ran one isolated-in-scope lane in the heavily modified working checkout; no destructive Git operations. Strict TDD RED: new `scripts/vc6-typeobject-object-set-class-newto-c89.test.py` failed before production edit (exit 1, expected assertion that `newto` must be in the C89 opening declaration block). GREEN: `cpython/Objects/typeobject.c` now declares `PyTypeObject *newto;` with the opening locals and assigns `(PyTypeObject *)value` at its prior point, after the same validation. The focused test passed (exit 0); all 88 applicable `scripts/vc6-typeobject-*.test.py` scripts passed individually (exit 0). Nested `git diff --check -- Objects/typeobject.c` and outer test diff check passed (exit 0); new-file no-index check emitted no whitespace diagnostics (exit 1 solely because files differ). The lane verified the exact two-location production delta and hashes for all 287 other prior dirty/untracked files unchanged, including this status file before this entry. Lane logs: `build/cron-20261026-run/codex.log` and `codex-last.txt`.

Forced-fresh post-change command: `mkdir -p build/cron-20261026-after-newto; XDG_RUNTIME_DIR=/home/ubuntu/r WINEPREFIX=/home/ubuntu/.wine-win9xport WINEDEBUG=-all VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh > build/cron-20261026-after-newto/probe.log 2>&1` — exit 2; summary `total=109 compiled=108 cached=0 skipped=0`. The `newto` errors at line 4897 cleared; `_blake2/blake2s_impl.c` still compiled. First stable diagnostics advance to `typeobject.c(5789)`: C2275 `PyObject` and C2065 `name`; later diagnostics in `set_names()` and subsequent functions are separate/later blockers, left untouched. Full capture: `build/cron-20261026-after-newto/probe.log`.

Files changed: `cpython/Objects/typeobject.c`, new `scripts/vc6-typeobject-object-set-class-newto-c89.test.py`, and this status entry. Compiler-probe progress only: no linked `pythoncore`/`python.exe`, Wine interpreter execution, or real Windows 98 SE execution. Next frontier: force-fresh confirm and isolate only the actual `typeobject.c(5789)` `name` declaration family. No completed port is claimed.

---