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.

https://bugs.gentoo.org/140205
https://bugs.gentoo.org/320251

--- a/gcc/config.gcc
+++ b/gcc/config.gcc
@@ -2455,7 +2455,7 @@ sh-*-symbianelf* | sh[12346l]*-*-symbianelf* | \
 	if test "$sh_multilibs" = "default" ; then
 		case ${target} in
 		sh64-superh-linux* | \
-		sh[1234]*)	sh_multilibs=${sh_cpu_target} ;;
+		sh[1234]*)	sh_multilibs=$(echo $(sed -n '/^[[:space:]]*case ${sh_multilib} in/,/)/{s:case ${sh_multilib} in::;s: | *:,:g;s:[\\)]::g;p}' ${srcdir}/config.gcc) | sed '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 ;;