[libcxx-commits] [libcxx] [libc++] Recognize _BitInt(N) as signed/unsigned integer type (PR #185027)

[Xavier Roche via libcxx-commits]

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xroche wrote:

Indeed, _BitInt(128) isn't guaranteed by C standard; I will add __BITINT_MAXWIDTH__ >= 128 guard.

As far as I could dig:

> _BITINT_MAXWIDTH — maximum width of a bit-precise integer type, a value not less than ULLONG_WIDTH_

Which "imply" _BitInt(64) is guaranteed (which is a rather weak property)

https://github.com/llvm/llvm-project/pull/185027