[Bug c++/50785] [C++0x][constexpr] static constexpr double undefined reference

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50785

--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-10-19 12:46:00 UTC ---
and I assume -O eliminates the reference binding due to inlining and value
propagation

this all seems normal for a missing definition of a static const member, like
dozens of other invalid PRs