19/12/14 17:58:45.99 k5kIl1RN.net
FYI
>>846
Bug 68012: g++ incorrectly accepts forward declaration of constexpr variable template
URLﾘﾝｸ(gcc.gnu.org)
>>848
One definition rule
URLﾘﾝｸ(timsong-cpp.github.io)
> No translation unit shall contain more than one definition of any variable, function, class type, enumeration type, or template.