[Bug c/54006] __atomic_always_lock_free inconsistent with __GCC_ATOMIC_INT_LOCK_FREE et al.

[hp at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54006

--- Comment #3 from Hans-Peter Nilsson <hp at gcc dot gnu.org> 2012-07-20 04:16:20 UTC ---
Created attachment 27842
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27842
Patch using can_compare_and_swap_p but with multiple problems

Besides the SEGV due to the initialization problem aleady mentioned, this patch
codifies the assumption that atomic intrinsic library functions (i.e.
libgcc-style) aren't lock-free, which is wrong but at least consistent with the
conceptual patch in PR54003.