[libcxx-commits] [libcxx] [libcxx] Undefine all supported C math functions (PR #94533)

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PiJoules wrote:

So the `#undef isnan` path in libcxx/include/__math/traits.h is definitely taken. I think perhaps the macro is redefined elsewhere by including the system math.h somewhere.

https://github.com/llvm/llvm-project/pull/94533