http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51373
--- Comment #2 from Daniel Krügler <daniel.kruegler at googlemail dot com> 2011-12-03 19:33:55 UTC --- (In reply to comment #1) > Even with the constexpr specifier that declaration should be ill-formed, > because the class definition must be complete for an in-class static data > member initializer. I just recognize that the class definition must not be complete to make the pointer of member formation a constant expression. So, the code of the first example should be well-formed after addition of constexpr to the static data member.
