re PR c/43395 (Gcc warns label as local variable)

	PR c/43395
c/
	* c-typeck.c (c_finish_return): Distinguish between label and variable
	when warning about returning local address.
cp/
	* typeck.c (maybe_warn_about_returning_address_of_local): Distinguish
	between label and variable when warning about returning local address.
testsuite/
	* c-c++-common/pr43395.c: New test.

From-SVN: r209973

gcc/c/ChangeLog

 2014-05-01  Marek Polacek  <polacek@redhat.com>
 
+	PR c/43395
+	* c-typeck.c (c_finish_return): Distinguish between label and variable
+	when warning about returning local address.
+
+2014-05-01  Marek Polacek  <polacek@redhat.com>
+
 	PR c/29467
 	* c-decl.c (declspecs_add_type): Pedwarn if boolean types are used
 	in C89 mode.

gcc/c/c-typeck.c

@@ -9265,7 +9265,8 @@ c_finish_return (location_t loc, tree retval, tree origtype)
 		  && DECL_CONTEXT (inner) == current_function_decl)
 		warning_at (loc,
 			    OPT_Wreturn_local_addr, "function returns address "
-			    "of local variable");
+			    "of %s", TREE_CODE (inner) == LABEL_DECL
+				     ? "label" : "local variable");
 	      break;
 
 	    default:

gcc/cp/ChangeLog

+2014-05-01  Marek Polacek  <polacek@redhat.com>
+
+	PR c/43395
+	* typeck.c (maybe_warn_about_returning_address_of_local): Distinguish
+	between label and variable when warning about returning local address.
+
 2014-04-30  Jason Merrill  <jason@redhat.com>
 
 	PR c++/60980

gcc/cp/typeck.c

@@ -8310,8 +8310,9 @@ maybe_warn_about_returning_address_of_local (tree retval)
 	warning (OPT_Wreturn_local_addr, "reference to local variable %q+D returned",
 		 whats_returned);
       else
-	warning (OPT_Wreturn_local_addr, "address of local variable %q+D returned",
-		 whats_returned);
+	warning (OPT_Wreturn_local_addr, "address of %s %q+D returned",
+		 TREE_CODE (whats_returned) == LABEL_DECL
+		 ? "label" : "local variable", whats_returned);
       return;
     }
 }

gcc/testsuite/ChangeLog

+2014-05-01  Marek Polacek  <polacek@redhat.com>
+
+	PR c/43395
+	* c-c++-common/pr43395.c: New test.
+
 2014-05-01  Yuri Rumyantsev  <ysrumyan@gmail.com>
 
 	* gcc.dg/cond-reduc-1.c: New test.

gcc/testsuite/c-c++-common/pr43395.c

+/* PR c/43395 */
+/* { dg-do compile } */
+
+void *
+foo (void)
+{
+lab:
+  return &&lab;
+/* { dg-warning "function returns address of label" "" { target c } 8 } */
+/* { dg-warning "address of label" "" { target c++ } 7 } */
+}
+
+void *
+bar (void)
+{
+  __label__ lab;
+lab:
+  return &&lab;
+/* { dg-warning "function returns address of label" "" { target c } 18 } */
+/* { dg-warning "address of label" "" { target c++ } 17 } */
+}
+
+void *
+baz (void)
+{
+  int i;
+  return &i;
+/* { dg-warning "function returns address of local variable" "" { target c } 27 } */
+/* { dg-warning "address of local variable" "" { target c++ } 26 } */
+}