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Summary

Add explicit -lm linkage for the _core C extension on non-Windows platforms
Fixes undefined symbol errors (nextafter, fmod, lround) on aarch64 Linux systems where libm is not implicitly linked

Closes #971

Test plan

Built and verified with ldd on two environments:

Ubuntu 22.04 (WSL2, x86_64, gcc 11.4, Python 3.10):

	libm linked?
Without fix	No - only `libc.so.6`
With fix	Yes - `libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6`

Ubuntu 24.04 (WSL2, x86_64, gcc 13.3, Python 3.12):

	libm linked?
Without fix	No - only `libc.so.6`
With fix	Yes - `libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6`

Windows 11 (Python 3.12, AMD64):

Confirmed that -lm is not added on win32 - libraries list stays empty. libm is part of MSVC runtime, no explicit linkage needed.

CI passes on all platforms

Add explicit -lm linkage for the _core C extension on non-Windows
platforms. Fixes undefined symbol errors (nextafter, fmod, lround)
on aarch64 Linux systems where libm is not implicitly linked.
Closes #971

Siyet mentioned this pull request

Apr 8, 2026

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