Minor H8 gas fix

[law@redhat.com]

Taking the difference of two undefined symbols was not giving an error.  This
patch fixes that little problem.

	* tc-h8300.c (tc_gen_reloc): Give an error if we try to take the
	address of two symbols in different sections.

Index: tc-h8300.c
===================================================================
RCS file: /cvs/cvsfiles/devo/gas/config/tc-h8300.c,v
retrieving revision 1.79
diff -c -3 -p -r1.79 tc-h8300.c
*** tc-h8300.c	2001/08/31 22:39:59	1.79
--- tc-h8300.c	2001/09/05 01:58:02
*************** tc_gen_reloc (section, fixp)
*** 1623,1628 ****
--- 1623,1639 ----
    arelent *rel;
    bfd_reloc_code_real_type r_type;
  
+   if (fixp->fx_addsy && fixp->fx_subsy)
+     {
+       if ((S_GET_SEGMENT (fixp->fx_addsy) != S_GET_SEGMENT (fixp->fx_subsy))
+ 	  || S_GET_SEGMENT (fixp->fx_addsy) == undefined_section)
+ 	{
+ 	  as_bad_where (fixp->fx_file, fixp->fx_line,
+ 			"Difference of symbols in different sections is not supported");
+ 	  return NULL;
+ 	}
+     }
+ 
    rel = (arelent *) xmalloc (sizeof (arelent));
    rel->sym_ptr_ptr = (asymbol **) xmalloc (sizeof (asymbol *));
    *rel->sym_ptr_ptr = symbol_get_bfdsym (fixp->fx_addsy);