[libcxx-commits] [libcxx] [libc++] Workaround for a bug of overloads in MS UCRT's `<math.h>` (PR #149234)

[Louis Dionne via libcxx-commits]

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@@ -189,6 +189,82 @@ template <class _A1, class _A2, __enable_if_t<is_arithmetic<_A1>::value && is_ar
   return __builtin_isunordered((type)__x, (type)__y);
 }
 
+// MS UCRT incorrectly defines some functions in a way not working with integer types. Until C++20, this was worked
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ldionne wrote:

@StephanTLavavej Do you think there is any way we might be able to get a fix in UCRT for this?

@frederick-vs-ja Since this is a bug in UCRT which has been reported and closed as "not to be fixed", I am tempted to say that keeping these tests as `XFAIL` and being non-conforming on UCRT might be acceptable. If they don't think it's worth fixing the issue, I'm not sure it's worth us doing a (pretty involved) workaround for it either.

https://github.com/llvm/llvm-project/pull/149234