https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81706
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Created attachment 41923 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=41923&action=edit gcc8-pr81706.patch The reason for why cmath does this is that C++ wants to have sin overloads. And the problem is that we have the simd attributes only on ::sinf, ::sin etc., but not on __builtin_sinf, __builtin_sin etc. So, either we change libstdc++ like with this untested patch, or change the compiler, so that when seeing a matching decl for a builtin which has simd attribute on it, we duplicate the attribute to the __builtin_* decl too.
