philnik777 wrote:

> Re: there being observable differences between a header in C vs C++ mode, 
> that's already a thing.
> 
> The definition for `isinf` in math.h is specified to be a macro in C, but 
> specified to be a function in C++. We're already doing `#ifdef __cplusplus` 
> for that (see 
> https://github.com/llvm/llvm-project/blob/main/libc/include/llvm-libc-macros/math-macros.h),
>  and other libc's do similar (see `iszero` in glibc).

That's actually really bad. Both libc++ and libstdc++ assume that these are 
either not provided at all by the libc or are macros. This will inevitably lead 
to ambiguous overloads.

https://github.com/llvm/llvm-project/pull/86748
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