https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70704
--- Comment #39 from Jakub Jelinek <jakub at gcc dot gnu.org> --- (In reply to David Edelsohn from comment #38) > The gt* files don't differ. > > I normally use > > --disable-werror --enable-languages=c,c++,fortran,objc --with-gmp=/opt/cfarm > --with-libiconv-prefix=/opt/cfarm --disable-libstdcxx-pch > --with-included-gettext --enable-checking=release Used /home/jakub/gcc-6.0.1-RC-20160415/configure --disable-werror --enable-languages=c,c++,fortran,objc --with-gmp=/opt/cfarm --with-libiconv-prefix=/opt/cfarm --disable-libstdcxx-pch --with-included-gettext --enable-checking=release myself now (inside of /home/jakub/rc1/) and it bootstrapped just fine too.