https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107008
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> --- A related topic is that we simply don't define the errc enumerators that don't have a corresponding EXXXX macro, which is non-conforming. The C++ standard says the enumerators should all be there. We could do something like this for each enumerator: #ifdef EFOO foo = EFOO, #else foo = _GLIBCXX_ERRC_ORIGIN + __LINE__, #endif Where _GLIBCXX_ERRC_ORIGIN is some value intended to be higher than the highest errno value on the OS. We only need fewer than 100 errc enumerators so INT_MAX/2 might be OK. We can use #line to set the __LINE__ to a fixed value in the file, so that the constants don't change if we add/remove lines before the errc definition.
