https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78872
Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |WAITING Last reconfirmed| |2016-12-20 Ever confirmed|0 |1 --- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> --- I don't see why you think this is a bug. There is no function called std::locale::icompare in the declared class std::locale. This is what the error message exactly says even.