https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96952
--- Comment #8 from Eric Botcazou <ebotcazou at gcc dot gnu.org> --- > Sorry, but it doesn't work. How do you suggest libstdc++ should use > configure-time checks to find out what features are present in the compiler > including the libstdc++ headers later? I don't know what that compiler is at > configure time. I'm surprising by that: are you saying that none of the _GLIBCXX_* values tested in the libstdc++ headers come from the libstdc++ configure machinery?
