[compiler-rt] [Apple][RTSan] Realtime sanitizers are failing in Apple CI (PR #124873)

[Chris Apple via llvm-commits]

cjappl wrote:

> Ah!
> 
> `[ RUN ] TestRtsan.AccessingALargeAtomicVariableDiesWhenRealtime dyld: lazy symbol binding failed: Symbol not found: ___atomic_is_lock_free Referenced from: /....../Rtsan-arm64-Test Expected in: /usr/lib/libSystem.B.dylib `

Hmm, that's strange!! This should be a symbol available in the C++ runtime:

https://en.cppreference.com/w/cpp/atomic/atomic/is_lock_free

I just pulled latest master and ran on my mac and things are green there. Let me know if you have any more leads, happy to provide any more assistance.

https://github.com/llvm/llvm-project/pull/124873