complex reloc corner case bug

[Alan Modra]

This fixes a corner case bug in the new complex relocation code that
caused a segfault on powerpc64.  It's possible to have a bfd with
relocs but no symbols (all the relocs use no symbol), a situation
that occurs with the powerpc64 linker created stub bfd.

	* elflink.c (evaluate_complex_relocation_symbols): Ignore relocs
	with a zero symbol index.

Index: bfd/elflink.c
===================================================================
RCS file: /cvs/src/src/bfd/elflink.c,v
retrieving revision 1.247
diff -u -p -r1.247 elflink.c
--- bfd/elflink.c	5 Feb 2007 23:15:38 -0000	1.247
+++ bfd/elflink.c	12 Feb 2007 10:58:11 -0000
@@ -6769,7 +6769,10 @@ evaluate_complex_relocation_symbols (bfd
 	  index = ELF32_R_SYM (rel->r_info);
 	  if (bed->s->arch_size == 64)
 	    index >>= 24;
- 
+
+	  if (index == STN_UNDEF)
+	    continue;
+
 	  if (index < locsymcount)
 	    {
 	      /* The symbol is local.  */

-- 
Alan Modra
IBM OzLabs - Linux Technology Centre