Here is the next to last issue I'd like to clear before turning on -Wall under GCC. The file includes the following, but its not performing as expected. #if GCC_DIAGNOSTIC_AWARE # pragma GCC diagnostic push # pragma GCC diagnostic ignored "-Wunknown-pragmas" #endif The befuddling thing (to me) is GCC is OpenMP conforming, so is _knows_ what '#pragma omp' is, even if its not activated via '-fopenmp'. There's an open issue on it at https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66943, but I don't think its going to get much attention since most code does not use OpenMP. g++ -DNDEBUG -g2 -O3 -Wall -fPIC -march=native -pipe -c rw.cpp rw.cpp:130:0: warning: ignoring #pragma omp parallel [-Wunknown-pragmas] #pragma omp parallel sections if(CRYPTOPP_RW_USE_OMP) ^ rw.cpp:132:0: warning: ignoring #pragma omp section [-Wunknown-pragmas] #pragma omp section ^ rw.cpp:134:0: warning: ignoring #pragma omp section [-Wunknown-pragmas] #pragma omp section ^ rw.cpp:136:0: warning: ignoring #pragma omp section [-Wunknown-pragmas] #pragma omp section ^ rw.cpp:228:0: warning: ignoring #pragma omp parallel [-Wunknown-pragmas] #pragma omp parallel sections if(CRYPTOPP_RW_USE_OMP) ^ rw.cpp:230:0: warning: ignoring #pragma omp section [-Wunknown-pragmas] #pragma omp section ^ rw.cpp:234:0: warning: ignoring #pragma omp section [-Wunknown-pragmas] #pragma omp section ^ ... You can find the file in question at https://github.com/weidai11/cryptopp/blob/master/rw.cpp. But the library uses parallel tasks in other places, so its a fairly widespread issue. On the good side, it localized to library source files, and it does not cross-pollinate to user code due to library headers. Thanks in advance. Jeff.
