Prevent object file collisions in parallel extension builds #5132
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e-luks
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…ension builds Parallel builds of extensions that share source files may write to the same object file paths under a common build directory, resulting in race conditions and non-deterministic build outputs. Use a per-extension subdirectory within build_temp to isolate object files and ensure deterministic, parallel-safe builds. Bug: https://bugs.gentoo.org/967476 Bug: https://bugs.gentoo.org/945376 See-also: pypa/setuptools#5132 Signed-off-by: Lukas Schmelting <lschmelting@posteo.com>
e-luks
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…ension builds Parallel builds of extensions that share source files may write to the same object file paths under a common build directory, resulting in race conditions and non-deterministic build outputs. Use a per-extension subdirectory within build_temp to isolate object files and ensure deterministic, parallel-safe builds. Bug: https://bugs.gentoo.org/967476 Bug: https://bugs.gentoo.org/945376 See-also: pypa/setuptools#5132 Signed-off-by: Lukas Schmelting <lschmelting@posteo.com>
Parallel builds of extensions that share source files may write to the same object file paths under a common build directory, resulting in race conditions and non-deterministic build outputs. Use a per-extension build directory to isolate object files and ensure deterministic, parallel-safe builds. Bug: pypa#3942
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Contributor
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Please not that https://setuptools.pypa.io/en/latest/development/developer-guide.html#code-conventions-and-other-practices
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@Avasam thanks, opened pypa/distutils#393 |
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Summary of changes
Parallel builds of extensions that share source files may write to the same object file paths under a common build directory, resulting in race conditions and non-deterministic build outputs.
Use a per-extension subdirectory within build_temp to isolate object files and ensure deterministic, parallel-safe builds.
Pull Request Checklist
newsfragments/.(See documentation for details)
Tests
I tested this change downstream at Gentoo after encountering https://bugs.gentoo.org/967476 and https://bugs.gentoo.org/945376 (packages https://pypi.org/project/librt and https://pypi.org/project/pymongo/). Since the build failures are encountered non-determinstically, i compiled both librt and pymongo as often as needed, capping the compilation attempts to 100.