[libc-commits] [libc] [libc] Provide isnan, isnanf and isnanl functions (PR #96008)

[Nick Desaulniers via libc-commits]

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@@ -17,4 +17,6 @@
 
 %%public_api()
 
+#define isnan(x) __builtin_isnan(x)
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nickdesaulniers wrote:

> Do we expect every consumer of this header to have this builtin?

Yes.  All versions of clang and gcc that we claim to support have this builtin. Therefor, we should not guard it with __has_builtin (same for other builtins).

https://github.com/llvm/llvm-project/pull/96008