[Bug middle-end/57974] std::pow(std::complex<long double>(0),1) returns (-nan,-nan)

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57974

--- Comment #2 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Or, more elegantly:

  __builtin_expl (-__builtin_huge_vall ())