[libcxx-commits] [libcxx] [libc++] Gate _BitInt library extensions behind opt-in macro per P3666R4 (PR #203841)

[Jan Schultke via libcxx-commits]

eisenwave wrote:

I've actually had a chat in Brno with @erichkeane about this, though I've mentioned the possiblity of an opt-out flag rather than an opt-in flag for the non-standard `_BitInt` library extensions. He told me to get in touch with @ldionne about this.

It would obviously make my job as the author of P3666 much easier if the behavior shipped by Clang was verbatim what's in the paper, by default.

https://github.com/llvm/llvm-project/pull/203841