http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49484
--- Comment #16 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-03-12 15:00:46 UTC --- If a target defines _GTHREAD_USE_MUTEX_INIT_FUNC in lisbtdc++-v3/config/os/.../os_defines.h then following this patch line 80 in gthr-posix.h will redefine __GTHREAD_MUTEX_INIT_FUNCTION and there will be two conflicting definitions of __gthread_mutex_init_function on lines 749 and 757
