PR gas/12049

* write.c (relax_frag): Don't allow forward branches to temporarily
	becomde backward branches.

gas/ChangeLog

@@ -1,3 +1,9 @@
+2010-10-25  Alan Modra  <amodra@gmail.com>
+
+	PR gas/12049
+	* write.c (relax_frag): Don't allow forward branches to temporarily
+	becomde backward branches.
+
 2010-10-23  Mark Mitchell  <mark@codesourcery.com>
 
 	* config/obj-elf.c (elf_adjust_symtab): New.  Move group section

gas/write.c

@@ -2163,6 +2163,13 @@ relax_frag (segT segment, fragS *fragP, long stretch)
 	  if (stretch < 0
 	      || sym_frag->region == fragP->region)
 	    target += stretch;
+	  /* If we get here we know we have a forward branch.  This
+	     relax pass may have stretched previous instructions so
+	     far that omitting STRETCH would make the branch
+	     negative.  Don't allow this in case the negative reach is
+	     large enough to require a larger branch instruction.  */
+	  else if (target < address)
+	    target = fragP->fr_next->fr_address + stretch;
 	}
     }