[all-commits] [llvm/llvm-project] e40ff7: [TSan][test-only] Make TSan os_unfair_lock.c test ...

[Dan Blackwell via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: e40ff72df1b0e03b17e2abad40c4b97e7ae447d7
      https://github.com/llvm/llvm-project/commit/e40ff72df1b0e03b17e2abad40c4b97e7ae447d7
  Author: Dan Blackwell <dan_blackwell at apple.com>
  Date:   2025-10-07 (Tue, 07 Oct 2025)

  Changed paths:
    M compiler-rt/test/tsan/Darwin/os_unfair_lock.c

  Log Message:
  -----------
  [TSan][test-only] Make TSan os_unfair_lock.c test check the weak symbol before usage (#161173)

The os_unfair_lock.c test can currently fail with a null dereference if
compiled on a platform with `os_unfair_lock_lock_with_flags`, but then
executed on a platform without the function.

This patch fixes this by first checking whether the symbol exists, and
falls back to `os_unfair_lock_lock` if not.

rdar://160596542



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