[Bug c++/45829] Unary minus on static const class variable triggering linker error

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45829

--- Comment #3 from Richard Guenther <rguenth at gcc dot gnu.org> 2010-09-29 
12:53:52 UTC ---
You didn't.  A definition would be

const double x::a;

at file-scope.  Your "definition" is a declaration.