re PR c++/59366 (A friend function template defined in a class is found without ADL)

	PR c++/59366
	* name-lookup.c (pushdecl_maybe_friend_1): Hide friend functions
	and function templates, declared only in the class.
	* decl.c (duplicate_decls): Reveal hidden friend functions or
	function templates, if they are redeclared outside the class.

From-SVN: r219689

gcc/cp/ChangeLog

+2015-01-15  Momchil Velikov  <momchil.velikov@gmail.com>
+
+	PR c++/59366
+	* name-lookup.c (pushdecl_maybe_friend_1): Hide friend functions
+	and function templates, declared only in the class.
+	* decl.c (duplicate_decls): Reveal hidden friend functions or
+	function templates, if they are redeclared outside the class.
+
 2015-01-15  Jason Merrill  <jason@redhat.com>
 
 	PR c++/64356

gcc/cp/decl.c

@@ -1871,6 +1871,19 @@ duplicate_decls (tree newdecl, tree olddecl, bool newdecl_is_friend)
   DECL_ATTRIBUTES (newdecl)
     = (*targetm.merge_decl_attributes) (olddecl, newdecl);
 
+  if (DECL_DECLARES_FUNCTION_P (olddecl) && DECL_DECLARES_FUNCTION_P (newdecl))
+    {
+      olddecl_friend = DECL_FRIEND_P (olddecl);
+      hidden_friend = (DECL_ANTICIPATED (olddecl)
+		       && DECL_HIDDEN_FRIEND_P (olddecl)
+		       && newdecl_is_friend);
+      if (!hidden_friend)
+	{
+	  DECL_ANTICIPATED (olddecl) = 0;
+	  DECL_HIDDEN_FRIEND_P (olddecl) = 0;
+	}
+    }
+
   if (TREE_CODE (newdecl) == TEMPLATE_DECL)
     {
       tree old_result;
@@ -2153,10 +2166,6 @@ duplicate_decls (tree newdecl, tree olddecl, bool newdecl_is_friend)
       if (DECL_DECLARES_FUNCTION_P (newdecl))
 	{
 	  DECL_NONCONVERTING_P (newdecl) = DECL_NONCONVERTING_P (olddecl);
-	  olddecl_friend = DECL_FRIEND_P (olddecl);
-	  hidden_friend = (DECL_ANTICIPATED (olddecl)
-			   && DECL_HIDDEN_FRIEND_P (olddecl)
-			   && newdecl_is_friend);
 	  DECL_BEFRIENDING_CLASSES (newdecl)
 	    = chainon (DECL_BEFRIENDING_CLASSES (newdecl),
 		       DECL_BEFRIENDING_CLASSES (olddecl));

gcc/cp/name-lookup.c

@@ -933,7 +933,18 @@ pushdecl_maybe_friend_1 (tree x, bool is_friend)
 	}
 
       if (DECL_DECLARES_FUNCTION_P (t))
-	check_default_args (t);
+	{
+	  check_default_args (t);
+
+	  if (is_friend && t == x && !flag_friend_injection)
+	    {
+	      /* This is a new friend declaration of a function or a
+		 function template, so hide it from ordinary function
+		 lookup.  */
+	      DECL_ANTICIPATED (t) = 1;
+	      DECL_HIDDEN_FRIEND_P (t) = 1;
+	    }
+	}
 
       if (t != x || DECL_FUNCTION_TEMPLATE_P (t))
 	return t;
@@ -995,16 +1006,6 @@ pushdecl_maybe_friend_1 (tree x, bool is_friend)
 	    }
 	}
 
-      if (TREE_CODE (x) == FUNCTION_DECL
-	  && is_friend
-	  && !flag_friend_injection)
-	{
-	  /* This is a new declaration of a friend function, so hide
-	     it from ordinary function lookup.  */
-	  DECL_ANTICIPATED (x) = 1;
-	  DECL_HIDDEN_FRIEND_P (x) = 1;
-	}
-
       /* This name is new in its binding level.
 	 Install the new declaration and return it.  */
       if (namespace_bindings_p ())

gcc/testsuite/g++.dg/template/friend57.C

+// PR c++/59366
+// { dg-do compile }
+template<typename T> void f(T);
+
+struct S
+{
+  template<typename T> friend void f(T) {}
+  template<typename T> friend void g(T) {}
+  template<typename T> friend void h(T) {}
+};
+
+template<typename T> void h(T);
+
+int
+main ()
+{
+  f(1);
+  g(1); // { dg-error "'g' was not declared in this scope" }
+  g(S());
+  h(1);
+}

gcc/testsuite/g++.old-deja/g++.pt/friend5.C

@@ -14,5 +14,5 @@ class C
 
 int main()
 {
-  f(7);
+  f(C());
 }