http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54823
Jakub Jelinek <jakub at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |jakub at gcc dot gnu.org --- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-10-05 12:06:58 UTC --- Whether something is a constant expression or not is one thing, whether you can fold a non-constant expression from standards POV into a constant is another thing. That folding is optional, it is an optimization, while the standard requires that enum constants are constant expressions and GCC doesn't include *" " among valid constant expressions. No idea why you need it, you can use ' ' which is a valid constant expression.