Use a persistent scikit-build build-dir to fix Windows tempdir cleanup flake#20
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…p flake python -m build intermittently fails on windows-2022 CI runners with PermissionError [WinError 32] while cleaning up scikit-build-core's TemporaryDirectory build dir (a lingering mspdbsrv.exe/AV handle holds files in Temp). The wheel itself builds fine; only the cleanup fails. Setting build-dir to a persistent, gitignored location skips the temporary directory entirely, so there is no cleanup to race with. Also gives incremental rebuilds locally. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Transurgeon
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Jul 13, 2026
…p flake (#20) python -m build intermittently fails on windows-2022 CI runners with PermissionError [WinError 32] while cleaning up scikit-build-core's TemporaryDirectory build dir (a lingering mspdbsrv.exe/AV handle holds files in Temp). The wheel itself builds fine; only the cleanup fails. Setting build-dir to a persistent, gitignored location skips the temporary directory entirely, so there is no cleanup to race with. Also gives incremental rebuilds locally. Co-authored-by: Transurgeon <peter.zijie@gmail.com> Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
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Problem
build_wheels (windows-2022, *)jobs fail intermittently (e.g. runs #100, #101) with:The traceback is raised from
TemporaryDirectorycleanup at the very end ofbuild_wheel-- the wheel compiles fine; only the cleanup of scikit-build-core's temp build dir fails, because a lingering process (mspdbsrv.exe / AV scanner) still holds a handle inTemp. The same commit passed on thev0.6.0tag run, confirming this is a flake, not a code issue.Fix
Set a persistent, gitignored build dir so scikit-build-core never creates (or cleans up) a temporary directory:
No temp dir, no cleanup, no race -- regardless of who holds the handle.
build/is already in.gitignore, so it stays out of the sdist; each CI job builds a single wheel tag, so there are no collisions; and local development gains incremental rebuilds.🤖 Generated with Claude Code