This seems to be an actual issue, I have now opened https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118838 Best Regards! Luca ________________________________ Da: Luca Bacci <luca.bacci@xxxxxxxxxxx> Inviato: lunedì 10 febbraio 2025 11:30 A: gcc-help@xxxxxxxxxxx <gcc-help@xxxxxxxxxxx> Oggetto: _Pragma diagnostic not working Consider this file: test-gcc.c ------------------------- #if defined(__clang__) # if __clang_major__ >= 12 # define FENV_ACCESS_ON _Pragma ("STDC FENV_ACCESS ON") # endif #elif defined(_MSC_VER) # define FENV_ACCESS_ON __pragma (fenv_access (on)) #elif defined(__GNUC__) // https://gcc.gnu.org/bugzilla/show_bug.cgi?id=34678 # define FENV_ACCESS_ON \ _Pragma ("GCC diagnostic push") \ _Pragma ("GCC diagnostic ignored \"-Wunknown-pragmas\"") \ _Pragma ("STDC FENV_ACCESS ON") \ _Pragma ("GCC diagnostic pop") #else # define FENV_ACCESS_ON _Pragma ("STDC FENV_ACCESS ON") #endif FENV_ACCESS_ON ------------------------- When compiling with -Wall I get an "unknown pragma" warning: test-gcc.c:18: warning: ignoring '#pragma STDC FENV_ACCESS' [-Wunknown-pragmas] Yet, if I preprocess separately and compile, I don't get any warning: gcc -E -P test-gcc.c | gcc -c -Wall -xc - Anyobdy knows why? Kind regards, Luca
