c-typeck.c (build_compound_expr): Annotate warning() call with OPT_Wunused_value.

2007-04-25  Dirk Mueller  <dmueller@suse.de>

       * c-typeck.c (build_compound_expr): Annotate warning()
       call with OPT_Wunused_value.

From-SVN: r124160

gcc/ChangeLog

+2007-04-25  Dirk Mueller  <dmueller@suse.de>
+
+	* c-typeck.c (build_compound_expr): Annotate warning()
+	call with OPT_Wunused_value.
+
 2007-04-25  Thiemo Seufer  <ths@mips.com>
 
 	* config/mips/mips.opt (mdmx, mmt, mno-mdmx): New options.

gcc/c-typeck.c

@@ -3402,7 +3402,8 @@ build_compound_expr (tree expr1, tree expr2)
 		       || TREE_CODE (TREE_OPERAND (expr1, 1)) == NOP_EXPR))
 	    ; /* (void) a, (void) b, c */
 	  else
-	    warning (0, "left-hand operand of comma expression has no effect");
+	    warning (OPT_Wunused_value, 
+		     "left-hand operand of comma expression has no effect");
 	}
     }