[libc-commits] [libc] [libc] Add Darwin mutex support via os_sync primitives (PR #167722)

[Shreeyash Pandey via libc-commits]

bojle wrote:

@SchrodingerZhu what is the recommended solution to fix this CI failure? I am thinking of adding __builtin_available style guards around API usage. As I understand, the failure is due to CI machine being outdated, right? 

https://github.com/llvm/llvm-project/pull/167722