http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53436
--- Comment #9 from Andrew Pinski <pinskia at gcc dot gnu.org> 2012-05-24 22:34:30 UTC --- (In reply to comment #8) > You cannot invoke the C99 standard when there is concurrency in your program, > as the standard doesn't deal with it at all. Though C++11/C11 does but we don't have it implemented yet.