https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85269
--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> --- LWG issues 343 has some bakckground into this problem: http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#343 It was resolved via LWG #1178 without solving the portability problem: http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#1178
