https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67047
Jonathan Wakely <redi at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Keywords| |diagnostic Status|UNCONFIRMED |NEW Last reconfirmed| |2015-07-29 Ever confirmed|0 |1 --- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> --- Yes you can verify that with static_assert( std::is_same<std::underlying_type<decltype(x)>::type, unsigned __int128>::value, ""); I suppose there should be a diagnostic with -Wpedantic (Clang has a -Wenum-too-large warning).