re PR debug/60655 (ICE: output_operand: invalid expression as operand)

	PR debug/60655
	* dwarf2out.c (mem_loc_descriptor <PLUS>): Return NULL if addend
	can't be output.

From-SVN: r214899

gcc/ChangeLog

+2014-09-04  Alan Modra  <amodra@gmail.com>
+
+	PR debug/60655
+	* dwarf2out.c (mem_loc_descriptor <PLUS>): Return NULL if addend
+	can't be output.
+
 2014-09-03  Matthew Fortune  <matthew.fortune@imgtec.com>
 
 	* target.def (TARGET_DWARF_FRAME_REG_MODE): New target hook.

gcc/dwarf2out.c

@@ -12699,7 +12699,7 @@ mem_loc_descriptor (rtx rtl, enum machine_mode mode,
 	      op1 = mem_loc_descriptor (XEXP (rtl, 1), mode, mem_mode,
 					VAR_INIT_STATUS_INITIALIZED);
 	      if (op1 == 0)
-		break;
+		return NULL;
 	      add_loc_descr (&mem_loc_result, op1);
 	      add_loc_descr (&mem_loc_result,
 			     new_loc_descr (DW_OP_plus, 0, 0));