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Fix compilation of MathExtras.h on Windows with /sdl #5809

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merged 2 commits into from Oct 24, 2023

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bhall-ctre
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On Windows, compilation fails with error C4146 on the MathExtras.h header when using the /sdl compiler flag. Since unary minus performs two's complement, it is equivalent to performing ones' complement (bitwise NOT) on the unsigned number and adding one.

This fix was copied from the LLVM main branch: llvm/llvm-project#68978

Fix copied from the LLVM main branch
ThadHouse
ThadHouse previously approved these changes Oct 24, 2023
@sciencewhiz
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This should be done as a patch in upstream_utils, not by modifying the llvm source. https://github.com/wpilibsuite/allwpilib/tree/main/upstream_utils#adding-patch-to-thirdparty-library

I reverted the previous file changes locally and ran the python script with
the latest patch and confirmed that there were no changes compared to the
MathExtras.h header compared to the previous commit.
@PeterJohnson PeterJohnson merged commit 63ef585 into wpilibsuite:main Oct 24, 2023
23 of 24 checks passed
@bhall-ctre bhall-ctre deleted the windows_compile_fix branch October 24, 2023 14:54
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5 participants