For x86, it looks "__GCC_HAVE_SYNC_COMPARE_AND_SWAP_8" only apply to i586 or 
above. So we can't define the 4 macros for all targets. 
I don't know if it is safe to define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_{1,2,4} 
for all targets.

And I can't find a way to compute the macros for each target either

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https://bugs.launchpad.net/bugs/1157603

Title:
  unit-tests built with clang crash in
  MirClientSurfaceTest.client_buffer_created_on_surface_creation

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