https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57654
Paolo Carlini <paolo.carlini at oracle dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- Summary|[c++11][constexpr] static |[c++11] static class member |class member |reference-to-a-reference |reference-to-a-reference |will not compile |will not compile | --- Comment #1 from Paolo Carlini <paolo.carlini at oracle dot com> --- This is fixed for 4.9.0. I'm adding the testcase and closing the bug.