PR c++/91921 - stray warning with -Woverloaded-virtual.

	* class.c (warn_hidden): Only emit the second part of
	-Woverloaded-virtual if the first part was issued.  Use inform instead
	warning_at.

	* g++.dg/warn/Woverloaded-2.C: New.
	* g++.dg/warn/Woverloaded-2.h: New.
	* g++.dg/warn/pr61945.C: Turn dg-warning into dg-message.
	* g++.old-deja/g++.mike/warn6.C: Likewise.
	* g++.old-deja/g++.warn/virt1.C: Likewise.

From-SVN: r276249

gcc/cp/ChangeLog

 2019-09-28  Marek Polacek  <polacek@redhat.com>
 
+	PR c++/91921 - stray warning with -Woverloaded-virtual.
+	* class.c (warn_hidden): Only emit the second part of
+	-Woverloaded-virtual if the first part was issued.  Use inform instead
+	warning_at.
+
 	PR c++/91923 - failure-to-SFINAE with class type NTTP in C++17.
 	* pt.c (invalid_nontype_parm_type_p): Only emit errors when
 	tf_error.

gcc/cp/class.c

@@ -2914,12 +2914,12 @@ warn_hidden (tree t)
 	FOR_EACH_VEC_ELT (base_fndecls, j, base_fndecl)
 	  if (base_fndecl)
 	    {
+	      auto_diagnostic_group d;
 	      /* Here we know it is a hider, and no overrider exists.  */
-	      warning_at (location_of (base_fndecl),
-			  OPT_Woverloaded_virtual,
-			  "%qD was hidden", base_fndecl);
-	      warning_at (location_of (fns),
-			  OPT_Woverloaded_virtual, "  by %qD", fns);
+	      if (warning_at (location_of (base_fndecl),
+			      OPT_Woverloaded_virtual,
+			      "%qD was hidden", base_fndecl))
+		inform (location_of (fns), "  by %qD", fns);
 	    }
       }
 }

gcc/testsuite/ChangeLog

 2019-09-28  Marek Polacek  <polacek@redhat.com>
 
+	PR c++/91921 - stray warning with -Woverloaded-virtual.
+	* g++.dg/warn/Woverloaded-2.C: New.
+	* g++.dg/warn/Woverloaded-2.h: New.
+	* g++.dg/warn/pr61945.C: Turn dg-warning into dg-message.
+	* g++.old-deja/g++.mike/warn6.C: Likewise.
+	* g++.old-deja/g++.warn/virt1.C: Likewise.
+
 	PR c++/91923 - failure-to-SFINAE with class type NTTP in C++17.
 	* g++.dg/cpp0x/nontype5.C: New test.
 

gcc/testsuite/g++.dg/warn/Woverloaded-2.C

+// PR c++/91921 - stray warning with -Woverloaded-virtual.
+// { dg-options "-Woverloaded-virtual" }
+
+#include "Woverloaded-2.h"
+
+struct B : A
+{
+  void f(int);
+};

gcc/testsuite/g++.dg/warn/Woverloaded-2.h

+#pragma GCC system_header
+
+struct A
+{
+  virtual void f();
+};

gcc/testsuite/g++.dg/warn/pr61945.C

@@ -7,5 +7,5 @@ class A {
 };
 class B : A {
   template <typename>
-  void foo ();		// { dg-warning "by .B::foo\\(\\)." }
+  void foo ();		// { dg-message "by .B::foo\\(\\)." }
 };

gcc/testsuite/g++.old-deja/g++.mike/warn6.C

@@ -30,13 +30,13 @@ struct D : public B, public B2, public B3 {
 
   virtual void bothsame(int);
 
-  virtual void bothdiff(int);		// { dg-warning "" } 
+  virtual void bothdiff(int);		// { dg-message "" } 
 
   virtual void both2same(int);
   virtual void both2same(float);
 
-  virtual void both12diff(int);		// { dg-warning "" } 
+  virtual void both12diff(int);		// { dg-message "" } 
 
-  virtual void bothfardiff(int);	// { dg-warning "" } 
+  virtual void bothfardiff(int);	// { dg-message "" } 
 };
 

gcc/testsuite/g++.old-deja/g++.warn/virt1.C

@@ -6,5 +6,5 @@ struct A {
 };
 
 struct B: public A {
-  void f(int); // { dg-warning "" } by this
+  void f(int); // { dg-message "" } by this
 };