http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52145
--- Comment #5 from Jeffrey Yasskin <jyasskin at gcc dot gnu.org> 2012-04-26 23:06:05 UTC --- "17" was the rough consensus at Kona for the target for the next standard. You could use -std=c++1y or c++1x or whatever instead.