Fix PR13468 -z text segfault

[Alan Modra]

Applying mainline and branch.

	PR ld/13468
	* elflink.c (bfd_elf_final_link): Don't segfault when checking
	for DT_TEXTREL and .dynamic does not exist.
	
Index: bfd/elflink.c
===================================================================
RCS file: /cvs/src/src/bfd/elflink.c,v
retrieving revision 1.430
diff -u -p -r1.430 elflink.c
--- bfd/elflink.c	15 Nov 2011 11:33:57 -0000	1.430
+++ bfd/elflink.c	3 Dec 2011 04:39:17 -0000
@@ -11188,15 +11188,12 @@ bfd_elf_final_link (bfd *abfd, struct bf
 	goto error_return;
 
       /* Check for DT_TEXTREL (late, in case the backend removes it).  */
-      if ((info->warn_shared_textrel && info->shared)
-	  || info->error_textrel)
+      if (((info->warn_shared_textrel && info->shared)
+	   || info->error_textrel)
+	  && (o = bfd_get_section_by_name (dynobj, ".dynamic")) != NULL)
 	{
 	  bfd_byte *dyncon, *dynconend;
 
-	  /* Fix up .dynamic entries.  */
-	  o = bfd_get_section_by_name (dynobj, ".dynamic");
-	  BFD_ASSERT (o != NULL);
-
 	  dyncon = o->contents;
 	  dynconend = o->contents + o->size;
 	  for (; dyncon < dynconend; dyncon += bed->s->sizeof_dyn)

-- 
Alan Modra
Australia Development Lab, IBM