re PR c++/50531 ([C++0x] ICE on defaulted template destructor)

	PR c++/50531
	* pt.c (instantiate_decl): Recognize when a function defaulted
	outside the class is already instantiated.

From-SVN: r180162

gcc/cp/ChangeLog

 2011-10-18  Jason Merrill  <jason@redhat.com>
 
+	PR c++/50531
+	* pt.c (instantiate_decl): Recognize when a function defaulted
+	outside the class is already instantiated.
+
 	PR c++/50742
 	* decl.c (check_previous_goto_1): Handle using-decl.
 

gcc/cp/pt.c

@@ -18045,6 +18045,8 @@ instantiate_decl (tree d, int defer_ok,
     d = DECL_CLONED_FUNCTION (d);
 
   if (DECL_TEMPLATE_INSTANTIATED (d)
+      || (TREE_CODE (d) == FUNCTION_DECL
+	  && DECL_DEFAULTED_FN (d) && DECL_INITIAL (d))
       || DECL_TEMPLATE_SPECIALIZATION (d))
     /* D has already been instantiated or explicitly specialized, so
        there's nothing for us to do here.

gcc/testsuite/ChangeLog

 2011-10-18  Jason Merrill  <jason@redhat.com>
 
+	PR c++/50531
+	* g++.dg/cpp0x/defaulted32.C: New.
+
 	PR c++/50742
 	* g++.dg/lookup/using23.C: New.
 

gcc/testsuite/g++.dg/cpp0x/defaulted32.C

+// PR c++/50531
+// { dg-options -std=c++0x }
+
+template <typename T>
+class DataFilter
+{
+ public:
+  inline virtual ~DataFilter();
+};
+
+template<typename T>
+inline DataFilter<T>::~DataFilter() = default;
+
+class ARCalculator : public DataFilter<ARCalculator>
+{
+ public:
+  virtual void dataStart(int, int);
+};
+
+void ARCalculator::dataStart(int, int)
+{}