http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49813
--- Comment #34 from Paolo Carlini <paolo.carlini at oracle dot com> 2011-07-25 11:17:24 UTC --- Better diagnostic would be always welcome, but probably we should deal with that elsewhere (we *do* have PRs about constexpr vs diagnostics), because it's a generic problem, isn't specific to the math functions in the library (quite a special case actually, because C++11 does *not* even mandate those functions to be constexpr)
