Eliminate 'atomic_thread_fence is unsupported with tsan' gcc-11 warning

The workaround is to use __atomic_test_and_set instead of
__atomic_thread_fence in case of option -fsanitize=thread is passed
to gcc (or clang).  The old behavior could be turned on by defining
AO_USE_ATOMIC_THREAD_FENCE macro.

* src/atomic_ops/sysdeps/gcc/generic.h [!AO_UNIPROCESSOR
&& AO_THREAD_SANITIZER && !AO_USE_ATOMIC_THREAD_FENCE] (AO_nop_read,
AO_nop_write, AO_nop_full): Do not define (using
__atomic_thread_fence); add comment.

0 files changed, 0 insertions, 0 deletions