http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51798
--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-01-25 14:08:41 UTC --- At least at this point I'd feel much safer if libstdc++ used just acq_rel semantics for the all atomic_fetch_and_add places, instead of somewhere acq and somewhere rel semantics.
