re PR c/48062 (`shadowed declaration is here' should be a note)

	PR c/48062
	* c-decl.c (warn_if_shadowing): Call inform instead of warning_at.
	Print note only if the warning was printed.

	* gcc.dg/Wshadow-1.c: Use dg-message for "shadowed declaration".
	* gcc.dg/Wshadow-3.c: Likewise.
	* gcc.dg/pr48062.c: New test.

From-SVN: r211254

gcc/c/ChangeLog

+2014-06-05  Marek Polacek  <polacek@redhat.com>
+
+	PR c/48062
+	* c-decl.c (warn_if_shadowing): Call inform instead of warning_at.
+	Print note only if the warning was printed.
+
 2014-06-04  Igor Zamyatin  <igor.zamyatin@intel.com>
 
 	PR c/58942

gcc/c/c-decl.c

@@ -2601,6 +2601,7 @@ warn_if_shadowing (tree new_decl)
 					     DECL_SOURCE_LOCATION (b->decl))))
       {
 	tree old_decl = b->decl;
+	bool warned = false;
 
 	if (old_decl == error_mark_node)
 	  {
@@ -2609,8 +2610,9 @@ warn_if_shadowing (tree new_decl)
 	    break;
 	  }
 	else if (TREE_CODE (old_decl) == PARM_DECL)
-	  warning (OPT_Wshadow, "declaration of %q+D shadows a parameter",
-		   new_decl);
+	  warned = warning (OPT_Wshadow,
+			    "declaration of %q+D shadows a parameter",
+			    new_decl);
 	else if (DECL_FILE_SCOPE_P (old_decl))
 	  {
 	    /* Do not warn if a variable shadows a function, unless
@@ -2620,9 +2622,10 @@ warn_if_shadowing (tree new_decl)
 		&& !FUNCTION_POINTER_TYPE_P (TREE_TYPE (new_decl)))
 		continue;
 
-	    warning_at (DECL_SOURCE_LOCATION (new_decl), OPT_Wshadow, 
-			"declaration of %qD shadows a global declaration",
-			new_decl);
+	    warned = warning_at (DECL_SOURCE_LOCATION (new_decl), OPT_Wshadow,
+				 "declaration of %qD shadows a global "
+				 "declaration",
+				 new_decl);
 	  }
 	else if (TREE_CODE (old_decl) == FUNCTION_DECL
 		 && DECL_BUILT_IN (old_decl))
@@ -2632,11 +2635,12 @@ warn_if_shadowing (tree new_decl)
 	    break;
 	  }
 	else
-	  warning (OPT_Wshadow, "declaration of %q+D shadows a previous local",
-		   new_decl);
+	  warned = warning (OPT_Wshadow, "declaration of %q+D shadows a "
+			    "previous local", new_decl);
 
-	warning_at (DECL_SOURCE_LOCATION (old_decl), OPT_Wshadow,
-		    "shadowed declaration is here");
+	if (warned)
+	  inform (DECL_SOURCE_LOCATION (old_decl),
+		  "shadowed declaration is here");
 
 	break;
       }

gcc/testsuite/ChangeLog

+2014-06-05  Marek Polacek  <polacek@redhat.com>
+
+	PR c/48062
+	* gcc.dg/Wshadow-1.c: Use dg-message for "shadowed declaration".
+	* gcc.dg/Wshadow-3.c: Likewise.
+	* gcc.dg/pr48062.c: New test.
+
 2014-06-04  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	PR c++/43453

gcc/testsuite/gcc.dg/Wshadow-1.c

@@ -5,7 +5,7 @@
 
 /* Source: Neil Booth, 5 Dec 2001.  */
 
-int decl1;			/* { dg-warning "shadowed declaration" } */
+int decl1;			/* { dg-message "shadowed declaration" } */
 void foo (double decl1)		/* { dg-warning "shadows a global decl" } */
 {				
 }
@@ -16,7 +16,7 @@ void foo1 (int d)		/* { dg-message "note: previous definition" } */
   /* { dg-error "redeclared as different" "" { target *-*-* } 15 } */
 }
 
-void foo2 (int d)		/* { dg-warning "shadowed declaration" } */
+void foo2 (int d)		/* { dg-message "shadowed declaration" } */
 {
   {
     double d;			/* { dg-warning "shadows a parameter" } */
@@ -25,7 +25,7 @@ void foo2 (int d)		/* { dg-warning "shadowed declaration" } */
 
 void foo3 ()
 {
-  int local;			/* { dg-warning "shadowed declaration" } */
+  int local;			/* { dg-message "shadowed declaration" } */
   {
     int local;			/* { dg-warning "shadows a previous local" } */
   }

gcc/testsuite/gcc.dg/Wshadow-3.c

@@ -5,7 +5,7 @@
 /* { dg-do compile } */
 /* { dg-options "-std=gnu89 -Wshadow" } */
 
-int v; /* { dg-warning "shadowed declaration" } */
+int v; /* { dg-message "shadowed declaration" } */
 int f1(int v);
 int f2(int v, int x[v]); /* { dg-warning "declaration of 'v' shadows a global declaration" } */
 int f3(int v, int y[sizeof(v)]); /* { dg-warning "declaration of 'v' shadows a global declaration" } */
@@ -18,4 +18,4 @@ int f9(x) int x; { return 0; }
 int f10(v) { return 0; } /* { dg-warning "declaration of 'v' shadows a global declaration" } */
 int f11(int a, int b(int a));
 int f12(int a, int b(int a, int x[a])); /* { dg-warning "declaration of 'a' shadows a parameter" } */
-/* { dg-warning "shadowed declaration" "outer parm" { target *-*-* } 20 } */
+/* { dg-message "shadowed declaration" "outer parm" { target *-*-* } 20 } */

gcc/testsuite/gcc.dg/pr48062.c

+/* PR c/48062 */
+/* { dg-do compile } */
+/* { dg-options "-Wshadow" } */
+
+int
+main (void)
+{
+  int i; /* { dg-bogus "shadowed declaration" } */
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wshadow"
+  { int i; }
+#pragma GCC diagnostic pop
+}