Fixes a seg fault in ld when linking udev on mips.

https://bugs.gentoo.org/show_bug.cgi?id=387055
http://sourceware.org/bugzilla/show_bug.cgi?id=12845
Reported by Aurelien Jarno.

===================================================================
RCS file: /cvs/src/src/bfd/elf.c,v
retrieving revision 1.538
retrieving revision 1.539
diff -u -r1.538 -r1.539
--- src/bfd/elf.c	2011/05/23 05:41:00	1.538
+++ src/bfd/elf.c	2011/06/09 10:36:20	1.539
@@ -6272,6 +6272,8 @@
       || obfd->xvec->flavour != bfd_target_elf_flavour)
     return TRUE;
 
+  BFD_ASSERT (elf_section_data (osec) != NULL);
+
   /* For objcopy and relocatable link, don't copy the output ELF
      section type from input if the output BFD section flags have been
      set to something different.  For a final link allow some flags
===================================================================
RCS file: /cvs/src/src/bfd/elfxx-mips.c,v
retrieving revision 1.285
retrieving revision 1.286
diff -u -r1.285 -r1.286
--- src/bfd/elfxx-mips.c	2011/06/03 10:11:06	1.285
+++ src/bfd/elfxx-mips.c	2011/06/09 10:36:20	1.286
@@ -1727,6 +1727,11 @@
 
   if (mips_elf_local_pic_function_p (h))
     {
+      /* PR 12845: If H is in a section that has been garbage
+	 collected it will have its output section set to *ABS*.  */
+      if (bfd_is_abs_section (h->root.root.u.def.section->output_section))
+	return TRUE;
+
       /* H is a function that might need $25 to be valid on entry.
 	 If we're creating a non-PIC relocatable object, mark H as
 	 being PIC.  If we're creating a non-relocatable object with
===================================================================
RCS file: /cvs/src/src/ld/emultempl/mipself.em,v
retrieving revision 1.12
retrieving revision 1.13
diff -u -r1.12 -r1.13
--- src/ld/emultempl/mipself.em	2010/02/04 09:16:43	1.12
+++ src/ld/emultempl/mipself.em	2011/06/09 10:36:19	1.13
@@ -138,6 +138,11 @@
   lang_output_section_statement_type *os;
   struct hook_stub_info info;
 
+  /* PR 12845: If the input section has been garbage collected it will
+     not have its output section set to *ABS*.  */
+  if (bfd_is_abs_section (output_section))
+    return NULL;
+
   /* Create the stub file, if we haven't already.  */
   if (stub_file == NULL)
     {