Without a specified name,
void GOMP_critical_start (void); void GOMP_critical_end (void);
so that we don't get COPY relocations from libgomp to the main application.
With a specified name, use omp_set_lock and omp_unset_lock with name being transformed into a variable declared like
omp_lock_t gomp_critical_user_<name> __attribute__((common))
Ideally the ABI would specify that all zero is a valid unlocked state, and so we wouldn't actually need to initialize this at startup.