On 20081011, Khem RAJ writes:
You have to bar gcc trying to build unwinding at stage 1.

/trunk/patches/gcc/4.2.0/290-sh-without-headers.patch | 26 26 0 0 ++++++++++++++++++++++++++
/trunk/patches/gcc/4.2.1/290-sh-without-headers.patch | 26 26 0 0 ++++++++++++++++++++++++++
/trunk/patches/gcc/4.2.2/290-sh-without-headers.patch | 26 26 0 0 ++++++++++++++++++++++++++
/trunk/patches/gcc/4.3.1/350-sh-without-headers.patch | 26 26 0 0 ++++++++++++++++++++++++++
/trunk/patches/gcc/4.2.3/310-sh-without-headers.patch | 26 26 0 0 ++++++++++++++++++++++++++
/trunk/patches/gcc/4.3.2/350-sh-without-headers.patch | 26 26 0 0 ++++++++++++++++++++++++++
/trunk/patches/gcc/4.2.4/310-sh-without-headers.patch | 26 26 0 0 ++++++++++++++++++++++++++
7 files changed, 182 insertions(+)

diff -durN gcc-3.4.6.orig/gcc/config/rs6000/linux-unwind.h gcc-3.4.6/gcc/config/rs6000/linux-unwind.h

--- gcc-3.4.6.orig/gcc/config/rs6000/linux-unwind.h	2005-03-17 11:41:18.000000000 +0100

+++ gcc-3.4.6/gcc/config/rs6000/linux-unwind.h	2007-08-15 23:07:00.000000000 +0200

@@ -32,6 +32,7 @@

    these structs elsewhere;  Many fields are missing, particularly

    from the end of the structures.  */

+#ifndef inhibit_libc

 struct gcc_vregs

 {

   __attribute__ ((vector_size (16))) int vr[32];

@@ -320,3 +321,4 @@

 									\

     goto SUCCESS;							\

   } while (0)

+#endif