https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86393
--- Comment #9 from Iain Sandoe <iains at gcc dot gnu.org> --- does this problem still exist? Please can you give me the exact processor type? in terminal: sysctl -a |grep cpu and find the actual intel part number. === It looks to me like there could be a misinterpretation of clang's output... features can be removed (-xxxx) or added (+xxxxx).