https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66438
--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> --- Indeed. Before gcc-5 it was never supported to combine C++11 objects compiled with different major versions. The whole point of calling C++11 support experimental was that we reserved the right to make incompatible changes to the C++11 features, otherwise you'd be forever stuck with the partial C++0x support added around the gcc-4.4 timeframe.
