[libcxx-commits] [libcxx] [libc++] Deprecates std::errc constants. (PR #80542)

[Aaron Ballman via libcxx-commits]

AaronBallman wrote:

FWIW, the POSIX macros can be deprecated in `errno.h` as well, via `#pragma clang deprecate`: https://godbolt.org/z/f8hdcs3Mf

Personally, I think deprecation is only valuable if users are warned about it explicitly. So I tend to lean towards (3) because it gets the notification out to users. It might be worth reaching out to libc folks supporting POSIX to see if they'd consider adding the deprecation warnings to errno.h as well?

https://github.com/llvm/llvm-project/pull/80542