Original patch from gentoo: gentoo/src/patchsets/gcc/4.3.1/gentoo/53_all_gcc4-superh-default-multilib.patch
The gcc-3.x toolchains would contain all the targets by default.  With gcc-4,
you have to actually list out the multilibs you want or you will end up with
just one when using targets like 'sh4-linux-gnu'.

The resulting toolchain can't even build a kernel as the kernel needs to build
with the nofpu flag to be sure that no fpu ops are generated.

Here we restore the gcc-3.x behavior; the additional overhead of building all
of these multilibs by default is negligible.

http://bugs.gentoo.org/140205

diff -durN gcc-4.3.1.orig/gcc/config.gcc gcc-4.3.1/gcc/config.gcc
--- gcc-4.3.1.orig/gcc/config.gcc	2008-05-21 10:54:15.000000000 +0200
+++ gcc-4.3.1/gcc/config.gcc	2008-06-10 14:58:06.000000000 +0200
@@ -2278,7 +2278,7 @@
 	if test x${sh_multilibs} = x ; then
 		case ${target} in
 		sh64-superh-linux* | \
-		sh[1234]*)	sh_multilibs=${sh_cpu_target} ;;
+		sh[1234]*)	sh_multilibs=`cd ${srcdir}/config/sh ; echo t-mlib-sh[1-4]* | sed 's:t-mlib-sh:,m:g;s: ::g'` ;;
 		sh64* | sh5*)	sh_multilibs=m5-32media,m5-32media-nofpu,m5-compact,m5-compact-nofpu,m5-64media,m5-64media-nofpu ;;
 		sh-superh-*)	sh_multilibs=m4,m4-single,m4-single-only,m4-nofpu ;;
 		sh*-*-linux*)	sh_multilibs=m1,m3e,m4 ;;