https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85672
--- Comment #8 from Jonathan Wakely <redi at gcc dot gnu.org> --- (In reply to Marc Glisse from comment #7) > Yes, or maybe don't generate #define _GLIBCXX_USE_FLOAT128 0 but instead /* > #undef _GLIBCXX_USE_FLOAT128 */ as we used to do and as the rest of the > c++config.h file does. All of those are auto-generated. The custom logic for the float128 macro isn't auto-generated. > Actually, I am not sure why r259813 needed to change > so many things... Because changing /* #undef _GLIBCXX_USE_FLOAT128 */ to a #define was done by autoconf, and that gets automatically added at the end of the c++config file after any manual alterations. The new logic that does: #if defined(__FLOAT128__) || defined(__SIZEOF_FLOAT128__) #undef _GLIBCXX_USE_FLOAT128 #endif comes before the automatically added parts. My autotools-fu is too weak to come up with anything better but I'd be very happy if you can suggest something cleaner.
