re PR c++/89622 (G++ prints notes, but no warning or error)

	PR c++/89622
	* call.c (joust): Call print_z_candidate only if pedwarn returned
	true.

	* g++.dg/warn/pr89622.C: New test.

From-SVN: r269481

gcc/cp/ChangeLog

+2019-03-08  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/89622
+	* call.c (joust): Call print_z_candidate only if pedwarn returned
+	true.
+
 2019-03-07  Jason Merrill  <jason@redhat.com>
 
 	PR c++/88123 - lambda and using-directive.

gcc/cp/call.c

@@ -10954,12 +10954,14 @@ tweak:
 	  if (warn)
 	    {
 	      auto_diagnostic_group d;
-	      pedwarn (input_location, 0,
-	      "ISO C++ says that these are ambiguous, even "
-	      "though the worst conversion for the first is better than "
-	      "the worst conversion for the second:");
-	      print_z_candidate (input_location, _("candidate 1:"), w);
-	      print_z_candidate (input_location, _("candidate 2:"), l);
+	      if (pedwarn (input_location, 0,
+			   "ISO C++ says that these are ambiguous, even "
+			   "though the worst conversion for the first is "
+			   "better than the worst conversion for the second:"))
+		{
+		  print_z_candidate (input_location, _("candidate 1:"), w);
+		  print_z_candidate (input_location, _("candidate 2:"), l);
+		}
 	    }
 	  else
 	    add_warning (w, l);

gcc/testsuite/ChangeLog

+2019-03-08  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/89622
+	* g++.dg/warn/pr89622.C: New test.
+
 2019-03-07  Jakub Jelinek  <jakub@redhat.com>
 
 	PR target/80003

gcc/testsuite/g++.dg/warn/pr89622.C

+// PR c++/89622
+// { dg-do compile { target c++11 } }
+// { dg-options "-Wno-system-headers -w" }
+// { dg-bogus "says that these are ambiguous" "" { target *-*-* } 0 }
+// { dg-bogus "candidate 1" "" { target *-*-* } 0 }
+// { dg-bogus "candidate 2" "" { target *-*-* } 0 }
+
+# 3 "pr89622.h" 3
+template<typename T>
+struct X
+{
+  X() { }
+  template<typename U> X(int, U&&) { }
+  template<typename U> X(char, const X<U>&) { }
+};
+
+template<typename T>
+X<T> wrap_X(X<T> x)
+{
+  return X<T>('a', x);
+}
+
+int main()
+{
+  X<void> x;
+  wrap_X(x);
+}