https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66976
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> --- (In reply to Anders Granlund from comment #0) > For comparison Clang accepts the program without errors. Not if you use -std=c++11 it doesn't. Both GCC and Clang reject it with -std=c++11 and accept it with -std=c++14, as expected. N.B. we don't need the full output of compiling with -v, just the output of 'gcc -v' is enough (and much less verbose).