re PR c++/45080 ([C++0x] Rejects lambda to function pointer conversion inside function template)

	PR c++/45080
	* pt.c (instantiate_class_template_1): Call maybe_add_lambda_conv_op.
	* semantics.c (lambda_function): Check COMPLETE_OR_OPEN_TYPE_P.

From-SVN: r174203

gcc/cp/ChangeLog

 2011-05-25  Jason Merrill  <jason@redhat.com>
 
+	PR c++/45080
+	* pt.c (instantiate_class_template_1): Call maybe_add_lambda_conv_op.
+	* semantics.c (lambda_function): Check COMPLETE_OR_OPEN_TYPE_P.
+
 	PR c++/48292
 	* pt.c (tsubst_decl) [PARM_DECL]: Handle partial instantiation of
 	function parameter pack.

gcc/cp/pt.c

@@ -8566,6 +8566,9 @@ instantiate_class_template_1 (tree type)
 	}
     }
 
+  if (CLASSTYPE_LAMBDA_EXPR (type))
+    maybe_add_lambda_conv_op (type);
+
   /* Set the file and line number information to whatever is given for
      the class itself.  This puts error messages involving generated
      implicit functions at a predictable point, and the same point

gcc/cp/semantics.c

@@ -8145,7 +8145,8 @@ lambda_function (tree lambda)
     type = lambda;
   gcc_assert (LAMBDA_TYPE_P (type));
   /* Don't let debug_tree cause instantiation.  */
-  if (CLASSTYPE_TEMPLATE_INSTANTIATION (type) && !COMPLETE_TYPE_P (type))
+  if (CLASSTYPE_TEMPLATE_INSTANTIATION (type)
+      && !COMPLETE_OR_OPEN_TYPE_P (type))
     return NULL_TREE;
   lambda = lookup_member (type, ansi_opname (CALL_EXPR),
 			  /*protect=*/0, /*want_type=*/false);

gcc/testsuite/ChangeLog

 2011-05-25  Jason Merrill  <jason@redhat.com>
 
+	* g++.dg/cpp0x/lambda/lambda-conv5.C: New.
+
 	* g++.dg/cpp0x/variadic109.C: New.
 
 2011-05-25  H.J. Lu  <hongjiu.lu@intel.com>

gcc/testsuite/g++.dg/cpp0x/lambda/lambda-conv5.C

+// PR c++/45080
+// { dg-options -std=c++0x }
+
+typedef void(*pfn)();
+
+template<typename=int>
+void f()
+{
+  pfn fn = []{};
+}
+
+void test()
+{
+  f();
+}