The patch is a solution for https://bugs.launchpad.net/ubuntu/+source/gcc-4.5/+bug/768921

-Khem

Index: gcc-4_5-branch/gcc/config.gcc
===================================================================
--- gcc-4_5-branch.orig/gcc/config.gcc	2011-06-16 21:23:22.000000000 -0700
+++ gcc-4_5-branch/gcc/config.gcc	2011-06-16 21:51:20.845279713 -0700
@@ -2035,7 +2035,7 @@
 	tmake_file="rs6000/t-fprules rs6000/t-fprules-fpbit rs6000/t-rtems t-rtems rs6000/t-ppccomm"
 	;;
 powerpc-*-linux* | powerpc64-*-linux*)
-	tm_file="${tm_file} dbxelf.h elfos.h freebsd-spec.h rs6000/sysv4.h"
+	tm_file="${tm_file} dbxelf.h elfos.h linux.h freebsd-spec.h rs6000/sysv4.h"
 	extra_options="${extra_options} rs6000/sysv4.opt"
 	tmake_file="t-dfprules rs6000/t-fprules rs6000/t-ppcos ${tmake_file} rs6000/t-ppccomm"
 	maybe_biarch=yes
Index: gcc-4_5-branch/gcc/config/rs6000/sysv4.h
===================================================================
--- gcc-4_5-branch.orig/gcc/config/rs6000/sysv4.h	2011-06-16 21:23:22.000000000 -0700
+++ gcc-4_5-branch/gcc/config/rs6000/sysv4.h	2011-06-16 22:08:49.425279473 -0700
@@ -620,6 +620,7 @@
 #define CC1_SECURE_PLT_DEFAULT_SPEC ""
 #endif
 
+#undef CC1_SPEC
 /* Pass -G xxx to the compiler and set correct endian mode.  */
 #define	CC1_SPEC "%{G*} %(cc1_cpu) \
 %{mlittle|mlittle-endian: %(cc1_endian_little);           \
@@ -903,22 +904,13 @@
 #define LINK_START_LINUX_SPEC ""
 
 #define GLIBC_DYNAMIC_LINKER "/lib/ld.so.1"
-#define UCLIBC_DYNAMIC_LINKER "/lib/ld-uClibc.so.0"
-#if DEFAULT_LIBC == LIBC_UCLIBC
-#define CHOOSE_DYNAMIC_LINKER(G, U) "%{mglibc:" G ";:" U "}"
-#elif DEFAULT_LIBC == LIBC_GLIBC
-#define CHOOSE_DYNAMIC_LINKER(G, U) "%{muclibc:" U ";:" G "}"
-#else
-#error "Unsupported DEFAULT_LIBC"
-#endif
-#define LINUX_DYNAMIC_LINKER \
-  CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER, UCLIBC_DYNAMIC_LINKER)
 
 #define LINK_OS_LINUX_SPEC "-m elf32ppclinux %{!shared: %{!static: \
   %{rdynamic:-export-dynamic} \
   %{!dynamic-linker:-dynamic-linker " LINUX_DYNAMIC_LINKER "}}}"
 
 #if defined(HAVE_LD_EH_FRAME_HDR)
+# undef LINK_EH_SPEC
 # define LINK_EH_SPEC "--no-add-needed %{!static:--eh-frame-hdr} "
 #endif
 
@@ -1113,6 +1105,7 @@
    be stacked, so that invocations of #pragma pack(pop)' will return
    to the previous value.  */
 
+#undef HANDLE_PRAGMA_PACK_PUSH_POP
 #define HANDLE_PRAGMA_PACK_PUSH_POP 1
 
 /* Select a format to encode pointers in exception handling data.  CODE
Index: gcc-4_5-branch/gcc/config/freebsd-spec.h
===================================================================
--- gcc-4_5-branch.orig/gcc/config/freebsd-spec.h	2011-06-16 17:59:03.000000000 -0700
+++ gcc-4_5-branch/gcc/config/freebsd-spec.h	2011-06-16 22:11:34.145279435 -0700
@@ -154,6 +154,7 @@
 #endif
 
 #if defined(HAVE_LD_EH_FRAME_HDR)
+#undef LINK_EH_SPEC
 #define LINK_EH_SPEC "%{!static:--eh-frame-hdr} "
 #endif