http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50681
Paolo Carlini <paolo.carlini at oracle dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution| |INVALID Summary|A constexpr identifier in a |[C++0x] A constexpr |header file generates |identifier in a header file |undefined symbols in object |generates undefined symbols |code. |in object code. --- Comment #1 from Paolo Carlini <paolo.carlini at oracle dot com> 2011-10-09 18:37:56 UTC --- Yes, you still need a definition, constexpr or not.