llvm-project

f00b32e2 - [libc++] Reduce the dependency of the locale base API on the base system from the headers (#117764)

[libc++] Reduce the dependency of the locale base API on the base system from the headers (#117764) Many parts of the locale base API are only required when building the shared/static library, but not from the headers. Document those functions and carve out a few of those that don't work when _XOPEN_SOURCE is defined to something old. Fixes #117630