http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51906
--- Comment #36 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-02-03 01:45:48 UTC --- is there a Mac OS X version macro that libstdc++ can check to workaround the bug, or should we just assume it will be fixed and users will have a working version?
