https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66146
Jonathan Wakely <redi at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |msebor at gcc dot gnu.org --- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> --- This has nothing to do with libstdc++, the std::call_once code is identical on x86 and ppc, and you get the same behaviour with pthreads, so it should be reported to glibc instead. #include <stdio.h> #include <pthread.h> pthread_once_t flag_ = PTHREAD_ONCE_INIT; int call_count = 0; extern "C" void func_() { printf("Inside func_ call_count %d\n", call_count); if (++call_count < 2) throw 0; } int main() { printf("Before calling call_once flag_: %d\n", *(int*)&flag_); try { pthread_once(&flag_, func_); } catch(...) { printf("Inside catch all excepton flag_: %d\n", *(int*)&flag_); } printf("before the 2nd call to call_once flag_: %d\n", *(int*)&flag_); pthread_once(&flag_, func_); }