http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53578
--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-06-05 00:24:31 UTC --- That stuff was a hack to get it working in a hurry, ideally we want a __gthread_mutex_destroy function. Otherwise, I can fix the sfinae check to work properly. Presumably just comparing to 0 would avoid a narrowing conversion.
