cc/gcc: disable complibs if not selected

Force gcc to not link with some companion libraries when
there are not needed (because selected-out).

There is no option to tell gcc *not* to build the Graphite and/or
LTO stuff. They *will* be built if gcc finds the suitable companion
libraries. If we do not provide them, but the host has them, then
gcc *will* find them, and link with them.

Consider the following:
- host has suitable PPL and CLooG (eg. Debian Squeeze)
- user wants to build gcc>=4.4
- user de-selects GRAPHITE
- gcc will find the hosts PPL and CLooG, and will use them
- the user moves the toolchain to an older host that does
not have them (eg. Debian Lenny)
- the toolchain fails, when it was properly setup not to

So, explicitly tell gcc *not* to use unneeded companion libs.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>

diff -durN gcc-3.4.6.orig/gcc/config/sh/lib1funcs.asm gcc-3.4.6/gcc/config/sh/lib1funcs.asm

--- gcc-3.4.6.orig/gcc/config/sh/lib1funcs.asm	2003-08-12 03:25:07.000000000 +0200

+++ gcc-3.4.6/gcc/config/sh/lib1funcs.asm	2007-08-15 23:04:26.000000000 +0200

@@ -37,9 +37,19 @@

    ELF local label prefixes by J"orn Rennecke

    amylaar@cygnus.com  */

+#define ALIAS(X,Y)	.global GLOBAL(X); .set GLOBAL(X),GLOBAL(Y)

+

 #ifdef __ELF__

 #define LOCAL(X)	.L_##X

-#define FUNC(X)		.type X,@function

+

+#if 1 /* ??? The export list mechanism is broken, everything that is not

+	 hidden is exported.  */

+#undef FUNC

+#define FUNC(X)		.type X,@function; .hidden X

+#undef ALIAS

+#define ALIAS(X,Y)	.global GLOBAL(X); .set GLOBAL(X),GLOBAL(Y); .hidden GLOBAL(X)

+#endif

+

 #define ENDFUNC0(X)	.Lfe_##X: .size X,.Lfe_##X-X

 #define ENDFUNC(X)	ENDFUNC0(X)

 #else