Avoid absolute generated source paths in cuda.core builds - #2720
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/ok to test 0ba000b |
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August 28, 2026 15:26
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Eye-balled the build time. Linux seems fine. Not sure if on Windows the average 10 mins is normal these days (I haven't followed closely since I took PTO). |
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Description
Follow-up to #2472.
PR #2472 correctly placed Cython-generated sources in a CUDA-major-keyed directory anchored to the checkout. Cython then returns those generated C++ source paths as absolute paths. When setuptools maps an absolute source into
build/temp, it reproduces the checkout path beneath that directory; sufficiently deep Windows worktrees can therefore exceed the linker path limit.This change converts absolute extension source paths to paths relative to the project root after
cythonize()returns. It preserves the anchored, CUDA-major-keyed generated-source cache from #2472, while preventing setuptools from embedding the full checkout path in its temporary object and linker output paths. Existing relative C++ source paths remain unchanged.Verification
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