http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51296
--- Comment #25 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-01-13 10:37:52 UTC --- Nice digging. POSIX does say the INIT macro is for use when the mutex is statically-allocated: "In cases where default mutex attributes are appropriate, the macro PTHREAD_MUTEX_INITIALIZER can be used to initialize mutexes that are statically allocated." For most platforms it works fine for automatic variables and in C++ for member variables too. Maybe something scans the BSS segment at startup to find mutexes?! In any case, it looks as though we should definitely use the init function instead of the macro on Tru64.
