http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55183
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> 2012-11-02 19:36:36 UTC --- 4.6 does not really do constexpr. Anyways I think this is a dup of bug 55039 as referenced by the following C++ Defect report: http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#1384
