re PR c++/45698 (C++0x Variadic Templates: Infinite template recursion rather…

re PR c++/45698 (C++0x Variadic Templates: Infinite template recursion rather than an error message)

	PR c++/45698
	* pt.c (dependent_template_arg_p): See through ARGUMENT_PACK_SELECT.

From-SVN: r174229

gcc/cp/ChangeLog

 2011-05-25  Jason Merrill  <jason@redhat.com>
 
+	PR c++/45698
+	* pt.c (dependent_template_arg_p): See through ARGUMENT_PACK_SELECT.
+
 	PR c++/46145
 	* decl.c (grokdeclarator): Complain about auto typedef.
 

gcc/cp/pt.c

@@ -18759,6 +18759,9 @@ dependent_template_arg_p (tree arg)
   if (arg == error_mark_node)
     return true;
 
+  if (TREE_CODE (arg) == ARGUMENT_PACK_SELECT)
+    arg = ARGUMENT_PACK_SELECT_ARG (arg);
+
   if (TREE_CODE (arg) == TEMPLATE_DECL
       || TREE_CODE (arg) == TEMPLATE_TEMPLATE_PARM)
     return dependent_template_p (arg);

gcc/testsuite/ChangeLog

 2011-05-25  Jason Merrill  <jason@redhat.com>
 
+	* g++.dg/cpp0x/variadic110.C: New.
+
 	* g++.dg/cpp0x/auto9.C: Add typedef test.
 
 	* g++.dg/cpp0x/auto23.C: New.

gcc/testsuite/g++.dg/cpp0x/variadic110.C

+// PR c++/45698
+// { dg-options -std=c++0x }
+
+template <class... Ts> struct tuple { };
+
+template<class... Ts>
+struct A {
+  template<typename T> struct N { };
+  tuple<N<Ts>...> tup;
+};
+
+int main()
+{
+  A<int, double> a;
+}