[patch] Fix a buglet in elfread.c

[ppluzhnikov@google.com (Paul Pluzhnikov)]

Greetings,

GDB appears to make unwarranted assumptions about presence of .data,
.rodata in and ELF image.

In http://sourceware.org/ml/gdb/2009-04/msg00228.html you can see an image
on Solaris which has .rodata, but no .data, and this causes

  elfread.c:366: internal-error: sect_index_data not initialized

when using /usr/lib/libXau.so.6 from Solaris snv103 (SunOS 5.11) for SPARC.

Attached patch fixes that.

OK?

--
Paul Pluzhnikov

2009-04-30  Paul Pluzhnikov  <ppluzhnikov@google.com>

	* elfread.c (elf_symtab_read): Don't assume .data and .rodata
	are present.


Index: elfread.c
===================================================================
RCS file: /cvs/src/src/gdb/elfread.c,v
retrieving revision 1.76
diff -u -p -u -r1.76 elfread.c
--- elfread.c	3 Jan 2009 05:57:51 -0000	1.76
+++ elfread.c	30 Apr 2009 15:03:41 -0000
@@ -427,10 +427,11 @@ elf_symtab_read (struct objfile *objfile
 			  int max_index;
 			  size_t size;
 
-			  max_index 
-			    = max (SECT_OFF_BSS (objfile),
-				   max (SECT_OFF_DATA (objfile),
-					SECT_OFF_RODATA (objfile)));
+			  max_index = SECT_OFF_BSS (objfile);
+			  if (objfile->sect_index_data > max_index)
+			    max_index = objfile->sect_index_data;
+			  if (objfile->sect_index_rodata > max_index)
+			    max_index = objfile->sect_index_rodata;
 
 			  /* max_index is the largest index we'll
 			     use into this array, so we must