[libcxx-commits] [libcxx] [libc++] Don't implement <stdatomic.h> before C++23 (PR #123130)

[Louis Dionne via libcxx-commits]

ldionne wrote:

That would make sense: this change goes back to the status quo that C's `<stdatomic.h>` is incompatible with `<atomic>` before C++23, and you must have been relying on that problem being fixed. This patch explains why we can't do that before C++23, though.

https://github.com/llvm/llvm-project/pull/123130