https://gcc.gnu.org/bugzilla/show_bug.cgi?id=24012
--- Comment #24 from Jonathan Wakely <redi at gcc dot gnu.org> --- The new tests fail on AIX 7.2: FAIL: 21_strings/headers/cwchar/24012.cc (test for excess errors) Excess errors: /home/jwakely/build/powerpc-ibm-aix7.2.0.0/libstdc++-v3/include/cwchar:224: error: '::wcstold' has not been declared /home/jwakely/build/powerpc-ibm-aix7.2.0.0/libstdc++-v3/include/cwchar:233: error: '::wcstoll' has not been declared /home/jwakely/build/powerpc-ibm-aix7.2.0.0/libstdc++-v3/include/cwchar:234: error: '::wcstoull' has not been declared /home/jwakely/build/powerpc-ibm-aix7.2.0.0/libstdc++-v3/include/cwchar:242: error: '__gnu_cxx::wcstold' has not been declared /home/jwakely/build/powerpc-ibm-aix7.2.0.0/libstdc++-v3/include/cwchar:243: error: '__gnu_cxx::wcstoll' has not been declared /home/jwakely/build/powerpc-ibm-aix7.2.0.0/libstdc++-v3/include/cwchar:244: error: '__gnu_cxx::wcstoull' has not been declared /home/jwakely/build/powerpc-ibm-aix7.2.0.0/libstdc++-v3/include/cwchar:268: error: '::wcstof' has not been declared /home/jwakely/build/powerpc-ibm-aix7.2.0.0/libstdc++-v3/include/cwchar:279: error: '::vfwscanf' has not been declared /home/jwakely/build/powerpc-ibm-aix7.2.0.0/libstdc++-v3/include/cwchar:290: error: '::vswscanf' has not been declared /home/jwakely/build/powerpc-ibm-aix7.2.0.0/libstdc++-v3/include/cwchar:300: error: '::vwscanf' has not been declared /home/jwakely/build/powerpc-ibm-aix7.2.0.0/libstdc++-v3/include/cwchar:310: error: '__gnu_cxx::wcstof' has not been declared /home/jwakely/build/powerpc-ibm-aix7.2.0.0/libstdc++-v3/include/cwchar:313: error: '__gnu_cxx::vfwscanf' has not been declared /home/jwakely/build/powerpc-ibm-aix7.2.0.0/libstdc++-v3/include/cwchar:316: error: '__gnu_cxx::vswscanf' has not been declared /home/jwakely/build/powerpc-ibm-aix7.2.0.0/libstdc++-v3/include/cwchar:319: error: '__gnu_cxx::vwscanf' has not been declared This isn't caused by the patch though, it always failed, for the same reason as FreeBSD. It doesn't pass with the patch because (unlike the BSDs) there's no dynamic check in config/os/aix/os_defines.h It looks like _ISOC99_SOURCE is the relevant macro for AIX. If that's not defined we don't get the C99 functions from <wchar.h>
