[PATCH, libstdc++] GLIBCXX_HAVE_INT64_T

[Jakub Jelinek]

On Fri, Jan 08, 2021 at 06:37:03PM +0000, Jonathan Wakely wrote:
> This uses __INT64_TYPE__ if that's defined, and long long otherwise. I
> think that should be equivalent in all practical cases (I can imagine
> some strange target where __INT64_TYPE__ is defined by the compiler,
> but int64_t isn't defined when the configure checks look for it, and
> so the current code would use long long and with my patch would use
> __INT64_TYPE__ which could be long ... but I think in practice that's
> unlikely. It was probably more likely in older releases where the
> configure test would have been done with -std=gnu++98 and so int64_t
> might not have been declared by libc's <stdint.h>, but if that was the
> case then any ABI break it caused happened years ago.

Does clang and ICC define __INT64_TYPE__ (at least on most architectures)
and does it match what gcc defines it to?

	Jakub