https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70454
--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to H.J. Lu from comment #0)
> # Similar jiggery-pokery for x86_64 multilibs, except here we
> # can't rely on the --with-arch configure option, since that
> # applies to the 64-bit side.
The 32-bit side is with_arch_32. If it is empty, the 64-bit --with-arch
will be used. Since the 64-bit $with_arch > i486, it is safe to use
$with_arch for 32-bit.
> x86_64-*-linux*)
> config_path="linux/x86 linux posix"
> case " ${CC} ${CFLAGS} " in
> *" -m32 "*)
> XCFLAGS="${XCFLAGS} -march=i486 -mtune=generic"
> ;;
> esac
> ;;
>
