https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114118

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I don't think we want to enable all the <cmath> functions etc. because those
aren't expected to be present before C++23. But the types like _Float32 are
already present, and that seems fine. I just think we should be able to detect
them in the library traits.

At the very least we should make __numeric_traits work for them, as that
already works for __int128 and __float128 when those are defined, even when
they're not considered to be an integer or floating-point type respectively.

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