re PR c++/8570 (line number in error message is badly placed with illegal template friend declaration)

2007-11-12  Manuel Lopez-Ibanez  <manu@gcc.gnu.org>

	PR c++/8570
cp/
	* pt.c (redeclare_class_template): Update error message. Use a
	note to show the previous declaration.
	(tsubst_friend_class): Use the location of the friend template as
	the input location before calling redeclare_class_template.
testsuite/
	* g++.old-deja/g++.ns/template13.C: Update expected output.
	* g++.old-deja/g++.pt/friend23.C: Likewise.
	* g++.dg/warn/pr8570.C: New.

From-SVN: r130092

gcc/cp/ChangeLog

@@ -1,3 +1,11 @@
+2007-11-12  Manuel Lopez-Ibanez  <manu@gcc.gnu.org>
+
+	PR c++/8570
+	* pt.c (redeclare_class_template): Update error message. Use a
+	note to show the previous declaration.
+	(tsubst_friend_class): Use the location of the friend template as
+	the input location before calling redeclare_class_template.
+
 2007-11-11  Jakub Jelinek  <jakub@redhat.com>
 
 	PR c++/34068

gcc/cp/pt.c

@@ -4151,10 +4151,10 @@ redeclare_class_template (tree type, tree parms)
 
   if (TREE_VEC_LENGTH (parms) != TREE_VEC_LENGTH (tmpl_parms))
     {
-      error ("previous declaration %q+D", tmpl);
-      error ("used %d template parameter(s) instead of %d",
-	     TREE_VEC_LENGTH (tmpl_parms),
-	     TREE_VEC_LENGTH (parms));
+      error ("redeclared with %d template parameter(s)", 
+             TREE_VEC_LENGTH (parms));
+      inform ("previous declaration %q+D used %d template parameter(s)", 
+             tmpl, TREE_VEC_LENGTH (tmpl_parms));
       return false;
     }
 
@@ -4193,7 +4193,7 @@ redeclare_class_template (tree type, tree parms)
 	     A template-parameter may not be given default arguments
 	     by two different declarations in the same scope.  */
 	  error ("redefinition of default argument for %q#D", parm);
-	  error ("%J  original definition appeared here", tmpl_parm);
+	  inform ("%Joriginal definition appeared here", tmpl_parm);
 	  return false;
 	}
 
@@ -6521,9 +6521,15 @@ tsubst_friend_class (tree friend_tmpl, tree args)
 	  > TMPL_ARGS_DEPTH (args))
 	{
 	  tree parms;
+          location_t saved_input_location;
 	  parms = tsubst_template_parms (DECL_TEMPLATE_PARMS (friend_tmpl),
 					 args, tf_warning_or_error);
+
+          saved_input_location = input_location;
+          input_location = DECL_SOURCE_LOCATION (friend_tmpl);
 	  redeclare_class_template (TREE_TYPE (tmpl), parms);
+          input_location = saved_input_location;
+          
 	}
 
       friend_type = TREE_TYPE (tmpl);

gcc/testsuite/ChangeLog

@@ -1,3 +1,10 @@
+2007-11-12  Manuel Lopez-Ibanez  <manu@gcc.gnu.org>
+
+	PR c++/8570
+	* g++.old-deja/g++.ns/template13.C: Update expected output.
+	* g++.old-deja/g++.pt/friend23.C: Likewise.
+	* g++.dg/warn/pr8570.C: New.
+
 2007-11-11  Jakub Jelinek  <jakub@redhat.com>
 
 	PR c++/34068

gcc/testsuite/g++.dg/warn/pr8570.C

@@ -0,0 +1,13 @@
+// PR c++/8570
+// { dg-do compile }
+// { dg-options "" }
+template <typename T, typename P>
+class X { // { dg-warning "note: previous declaration .* used 2" }
+public:
+  X() { }
+
+private:
+  template <typename U> friend class X; // { dg-error "error: .*redeclared with 1 template parameter" }
+};
+
+X<int, int> i;

gcc/testsuite/g++.old-deja/g++.ns/template13.C

@@ -5,7 +5,7 @@ namespace bar
   // trick it to provide some prior declaration
   template<class T>
   void foo(); // { dg-error "definition" }
-  template<class T>class X; // { dg-error "previous declaration" }
+  template<class T>class X; // { dg-error "note: previous declaration" }
 }
 
 template <typename T>
@@ -20,4 +20,4 @@ template<> void bar::foo<int>()     // { dg-error "different namespace" }
 }
 
 template<class T,class U>
-class bar::X{};         // { dg-error "1 template parameter" }
+class bar::X{};         // { dg-error "error: redeclared with 2 template parameter" }

gcc/testsuite/g++.old-deja/g++.pt/friend23.C

@@ -1,10 +1,10 @@
 // { dg-do assemble  }
 
-template <class T = int> // { dg-error "" } original definition
+template <class T = int> // { dg-error "note: original definition" }
 struct S
-{ // { dg-error "" } redefinition of default arg
+{ 
   template <class U = int>
-  friend class S;
+  friend class S; // { dg-error "redefinition of default argument" }
 };
 
 template struct S<int>;