http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54326
--- Comment #1 from Gary Funck <gary at intrepid dot com> 2012-08-19 20:54:51 UTC --- Don't know if this is relevant, but a recent thread on the clang-dev list explored the differences between GCC and clang in the handling of const and constexpr. "clang vs GCC error case: both ‘const’ and ‘constexpr’ cannot be used here" http://lists.cs.uiuc.edu/pipermail/cfe-dev/2012-August/023565.html
