re PR c/89525 (inform messages from -Wbuiltin-declaration-mismatch even with -w)

	PR c/89525
	* c-typeck.c (convert_arguments): Call inform_declaration only if
	the previous warning_at call returned true.

	* gcc.dg/pr89525.c: New test.

From-SVN: r269274

gcc/c/ChangeLog

+2019-02-28  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c/89525
+	* c-typeck.c (convert_arguments): Call inform_declaration only if
+	the previous warning_at call returned true.
+
 2019-02-22  Thomas Schwinge  <thomas@codesourcery.com>
 
 	* c-parser.c (c_parser_oacc_shape_clause): Add loc formal

gcc/c/c-typeck.c

@@ -3509,11 +3509,9 @@ convert_arguments (location_t loc, vec<location_t> arg_loc, tree typelist,
 
       if (builtin_type == void_type_node)
 	{
-	  warning_at (loc, OPT_Wbuiltin_declaration_mismatch,
+	  if (warning_at (loc, OPT_Wbuiltin_declaration_mismatch,
 			  "too many arguments to built-in function %qE "
-		      "expecting %d",
-		      function, parmnum);
-
+			  "expecting %d", function, parmnum))
 	    inform_declaration (fundecl);
 	  builtin_typetail = NULL_TREE;
 	}
@@ -3651,9 +3649,9 @@ convert_arguments (location_t loc, vec<location_t> arg_loc, tree typelist,
       for (tree t = builtin_typetail; t; t = TREE_CHAIN (t))
 	++nargs;
 
-      warning_at (loc, OPT_Wbuiltin_declaration_mismatch,
-		  "too few arguments to built-in function %qE expecting %u",
-		  function, nargs - 1);
+      if (warning_at (loc, OPT_Wbuiltin_declaration_mismatch,
+		      "too few arguments to built-in function %qE "
+		      "expecting %u", function, nargs - 1))
 	inform_declaration (fundecl);
     }
 

gcc/testsuite/ChangeLog

 2019-02-28  Jakub Jelinek  <jakub@redhat.com>
 
+	PR c/89525
+	* gcc.dg/pr89525.c: New test.
+
 	PR c/89520
 	* gcc.dg/pr89520-1.c: New test.
 	* gcc.dg/pr89520-2.c: New test.

gcc/testsuite/gcc.dg/pr89525.c

+/* PR c/89525 */
+/* { dg-do compile } */
+/* { dg-options "-w" } */
+
+double sqrt ();	/* { dg-bogus "declared here" } */
+
+void
+foo (void)
+{
+  sqrt ();
+}