https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78116
--- Comment #7 from Yuri Rumyantsev <ysrumyan at gmail dot com> --- Compiler was configures with: Configured with: <dir-name>/configure --enable-languages=c,c++ --enable-clocale=gnu --enable-cloog-backend=isl --enable-shared --disable-libsanitizer --disable-bootstrap --disable-nls --with-system-zlib --with-demangler-in-ld --with-arch=corei7 --with-cpu=corei7 --with-fpmath=sse --prefix=<dir-name>/install Thread model: posix gcc version 7.0.0 20161014 (experimental) (GCC) I assume that arch and cpu are not essential.