[C++] Use inform more in pushdecl_maybe_friend_1

Index: cp/name-lookup.c
===================================================================
--- cp/name-lookup.c	(revision 198939)
+++ cp/name-lookup.c	(working copy)
@@ -943,8 +943,10 @@  pushdecl_maybe_friend_1 (tree x, bool is_friend)
 	      && TREE_CODE (decl) == TREE_CODE (x)
 	      && !same_type_p (TREE_TYPE (x), TREE_TYPE (decl)))
 	    {
-	      permerror (input_location, "type mismatch with previous external decl of %q#D", x);
-	      permerror (input_location, "previous external decl of %q+#D", decl);
+	      if (permerror (input_location, "type mismatch with previous "
+			     "external decl of %q#D", x))
+		inform (input_location, "previous external decl of %q+#D",
+			decl);
 	    }
 	}
 
@@ -1161,19 +1163,23 @@  pushdecl_maybe_friend_1 (tree x, bool is_friend)
 
 	      if (warn_shadow && !nowarn)
 		{
+		  bool warned;
+
 		  if (TREE_CODE (oldlocal) == PARM_DECL)
-		    warning_at (input_location, OPT_Wshadow,
+		    warned = warning_at (input_location, OPT_Wshadow,
 				"declaration of %q#D shadows a parameter", x);
 		  else if (is_capture_proxy (oldlocal))
-		    warning_at (input_location, OPT_Wshadow,
+		    warned = warning_at (input_location, OPT_Wshadow,
 				"declaration of %qD shadows a lambda capture",
 				x);
 		  else
-		    warning_at (input_location, OPT_Wshadow,
+		    warned = warning_at (input_location, OPT_Wshadow,
 				"declaration of %qD shadows a previous local",
 				x);
-		   warning_at (DECL_SOURCE_LOCATION (oldlocal), OPT_Wshadow,
-			       "shadowed declaration is here");
+
+		  if (warned)
+		    inform (DECL_SOURCE_LOCATION (oldlocal),
+			    "shadowed declaration is here");
 		}
 	    }
 
@@ -1213,10 +1219,11 @@  pushdecl_maybe_friend_1 (tree x, bool is_friend)
                                    || TREE_CODE (x) == TYPE_DECL))))
 		/* XXX shadow warnings in outer-more namespaces */
 		{
-		  warning_at (input_location, OPT_Wshadow,
-			      "declaration of %qD shadows a global declaration", x);
-		  warning_at (DECL_SOURCE_LOCATION (oldglobal), OPT_Wshadow,
-			      "shadowed declaration is here");
+		  if (warning_at (input_location, OPT_Wshadow,
+				  "declaration of %qD shadows a "
+				  "global declaration", x))
+		    inform (DECL_SOURCE_LOCATION (oldglobal),
+			    "shadowed declaration is here");
 		}
 	    }
 	}
Index: testsuite/g++.dg/cpp0x/lambda/lambda-shadow1.C
===================================================================
--- testsuite/g++.dg/cpp0x/lambda/lambda-shadow1.C	(revision 198936)
+++ testsuite/g++.dg/cpp0x/lambda/lambda-shadow1.C	(working copy)
@@ -2,7 +2,7 @@ 
 // { dg-options "-std=c++11 -Wshadow" }
 
 int main() {
-  int x = 1;			  // { dg-warning "shadowed" }
+  int x = 1;			  // { dg-message "shadowed" }
   auto const lambda = [](int x) { // { dg-warning "shadows" }
     return x;
   };
Index: testsuite/g++.dg/warn/Wshadow-1.C
===================================================================
--- testsuite/g++.dg/warn/Wshadow-1.C	(revision 198936)
+++ testsuite/g++.dg/warn/Wshadow-1.C	(working copy)
@@ -18,8 +18,8 @@  struct status			// { dg-bogus "shadowed declaratio
   }
 };
 
-int decl1;			// { dg-warning "shadowed declaration" }
-int decl2;			// { dg-warning "shadowed declaration" }
+int decl1;			// { dg-message "shadowed declaration" }
+int decl2;			// { dg-message "shadowed declaration" }
 void foo (struct status &status,// { dg-bogus "shadows a global decl" }
 	  double decl1)		// { dg-warning "shadows a global decl" }
 {
@@ -34,7 +34,7 @@  void status::foo2 ()
 {
   int member;			// { dg-warning "shadows a member" }
   int decl2;			// { dg-warning "shadows a global decl" }
-  int local;			// { dg-warning "shadowed declaration" }
+  int local;			// { dg-message "shadowed declaration" }
   {
     int local;			// { dg-warning "shadows a previous local" }
   }
Index: testsuite/g++.dg/warn/Wshadow-6.C
===================================================================
--- testsuite/g++.dg/warn/Wshadow-6.C	(revision 198936)
+++ testsuite/g++.dg/warn/Wshadow-6.C	(working copy)
@@ -4,10 +4,10 @@ 
 // { dg-options "-std=c++0x -Wshadow" }
 
 struct S {};
-int f1(int x)   // { dg-warning "shadowed declaration" }
+int f1(int x)   // { dg-message "shadowed declaration" }
 {
  int t = 0;
- int m = 0;     // { dg-warning "shadowed declaration" }
+ int m = 0;     // { dg-message "shadowed declaration" }
  [&t] (int x) { // { dg-warning "shadows a parameter" }
    int m = 1;   // { dg-warning "shadows a previous local" }
    t = t + x + m;
@@ -18,9 +18,9 @@  struct S {};
 void f2(struct S i, int j) {
   struct A {
     struct S x;
-    void g(struct S i) { // { dg-warning "shadowed declaration" }
+    void g(struct S i) { // { dg-message "shadowed declaration" }
 	  struct S x;    // { dg-warning "shadows a member of" }
-	  struct S y;    // { dg-warning "shadowed declaration" }
+	  struct S y;    // { dg-message "shadowed declaration" }
 	  int t;
 	   [&t](struct S i){   // { dg-warning "shadows a parameter" }
 		 int j = 1;    // { dg-bogus "shadows" }
@@ -33,7 +33,7 @@  void f2(struct S i, int j) {
 
 void f3(int i) {
  [=]{
-   int j = i;			// { dg-warning "shadowed declaration" }
+   int j = i;			// { dg-message "shadowed declaration" }
    int i;			// { dg-warning "shadows a lambda capture" }
    i = 1;
  };
@@ -42,7 +42,7 @@  void f3(int i) {
 template <class T>
 void f4(int i) {
  [=]{
-   int j = i;			// { dg-warning "shadowed declaration" }
+   int j = i;			// { dg-message "shadowed declaration" }
    int i;			// { dg-warning "shadows a lambda capture" }
    i = 1;
  };
Index: testsuite/g++.dg/warn/Wshadow-7.C
===================================================================
--- testsuite/g++.dg/warn/Wshadow-7.C	(revision 198936)
+++ testsuite/g++.dg/warn/Wshadow-7.C	(working copy)
@@ -1,18 +1,18 @@ 
 // PR c++/44128
 // { dg-options "-Wshadow" }
 
-typedef long My_ssize_t;  // { dg-warning "shadowed declaration" }
-typedef int Foo;          // { dg-warning "shadowed declaration" }
+typedef long My_ssize_t;  // { dg-message "shadowed declaration" }
+typedef int Foo;          // { dg-message "shadowed declaration" }
 struct Bar1 {             // { dg-bogus "shadowed declaration" }
   int a;
 };
-struct Bar2 {             // { dg-warning "shadowed declaration" }
+struct Bar2 {             // { dg-message "shadowed declaration" }
   int a;
 };
 
 void func() {
   typedef int My_ssize_t; // { dg-warning "shadows a global" }
-  typedef char My_Num;    // { dg-warning "shadowed declaration" }
+  typedef char My_Num;    // { dg-message "shadowed declaration" }
   {
     typedef short My_Num; // { dg-warning "shadows a previous local" }
   }
@@ -21,7 +21,7 @@  void func() {
   struct Bar2 {           // { dg-warning "shadows a global" }
     int a;
   };
-  struct Bar3 {           // { dg-warning "shadowed declaration" }
+  struct Bar3 {           // { dg-message "shadowed declaration" }
     int a;
   };
   struct Bar4 {           // { dg-bogus "shadowed declaration" }