http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40856
--- Comment #13 from Marc Glisse <glisse at gcc dot gnu.org> 2012-10-25 20:23:43 UTC --- (In reply to comment #12) > If I can declare a variable of a non-standard extension-type with some > compiler flags in effect, e.g., -std=c++11, then I should also be able > to get a sensible answer from std::numeric_limits and <type_traits> > with the same compiler flags. *If* that's what's wanted, defined(__SIZEOF_INT128__) is the right test (_GLIBCXX_USE_INT128 could use it in its definition).
