https://gcc.gnu.org/bugzilla/show_bug.cgi?id=32187
--- Comment #12 from joseph at codesourcery dot com <joseph at codesourcery dot com> --- You can now use _Complex _Float128. Given that, it's not obvious that _Complex __float128, with the legacy __float128 type name, should be supported (although not supporting that means also not supporting _Complex __ibm128 for powerpc64le; both are built-in typedefs, and no _Float* keyword can be used for __ibm128). _Float128 isn't supported for C++, although there's the argument that there std::complex<__float128> is the thing support should be added / enabled for, rather than adding to the support for C-style complex types in C++.
