http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51906
--- Comment #45 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-02-03 17:16:38 UTC --- Then I think we have to disable __GTHREAD_RECURSIVE_MUTEX_INIT unconditionally on darwin. If the bug is later fixed in (say) 10.8 then we could use the init macro if MIN_REQUIRED >= 1080 since we know that it won't be run on a system where the bug is present.