https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59087
--- Comment #12 from Vitali <vlovich at gmail dot com> --- Actually, http://en.cppreference.com/w/cpp/header seems to indicate that when compiling as C++, complex.h should be equal to including ccomplex in a global namespace. It seems like the inclusion of C99 complex.h is a GNU extension & should only be done if GNU extensions are enabled.
