http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53627
--- Comment #7 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-06-10 21:50:18 UTC --- (In reply to comment #4) > because that was fixed with C++11 due to > > http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#712 > > This situation should no longer require a definition for S::a or S::b. Unless I'm mistaken DR 712 was not fixed in time for C++11, I don't see it in N3290