http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52036
--- Comment #4 from Daniel Krügler <daniel.kruegler at googlemail dot com> 2012-01-29 17:28:14 UTC --- (In reply to comment #3) > However compilation still fails if pi is given internal linkage by declaring > it > static, i.e. > > int main() > { > static constexpr float pi = 3.14; > > Or even: > > namespace { > static constexpr float pi = 3.14; > } I agree that both examples should work and that the lack of that is a bug when compiled in C++11 mode. Paolo, this bug should be reopened.