https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70454
--- Comment #1 from Uroš Bizjak <ubizjak at gmail dot com> --- (In reply to H.J. Lu from comment #0) > "if test -z "$with_arch"; then" is missing from x86-64 target. You *did* read the comment above this part, didn't you?