[libcxx-commits] [libcxx] [libc++] Switch to a new technique for std::to_chars availability (PR #234468)

[Louis Dionne via libcxx-commits]

ldionne wrote:

@philnik777 @mikekazakov This is based on the prototype in https://github.com/llvm/llvm-project/pull/230540#discussion_r4339097755.

I'm not convinced yet we should do this (or the other approach in that comment with an availability attribute inside a template), but I think it does solve a lot of the issues we have right now with availability attributes.

https://github.com/llvm/llvm-project/pull/234468