DR 337 PR c++/17232

	DR 337
	PR c++/17232
	* pt.c (tsubst) [ARRAY_TYPE]: Use abstract_virtuals_error_sfinae.
	* typeck2.c (abstract_virtuals_error_sfinae): Call complete_type.

From-SVN: r196734

gcc/cp/ChangeLog

 2013-03-16  Jason Merrill  <jason@redhat.com>
 
+	DR 337
+	PR c++/17232
+	* pt.c (tsubst) [ARRAY_TYPE]: Use abstract_virtuals_error_sfinae.
+	* typeck2.c (abstract_virtuals_error_sfinae): Call complete_type.
+
 	DR 657
 	* pt.c (tsubst_function_type): Call abstract_virtuals_error_sfinae.
 	(tsubst_arg_types): Likewise.

gcc/cp/pt.c

@@ -11653,13 +11653,9 @@ tsubst (tree t, tree args, tsubst_flags_t complain, tree in_decl)
 	      error ("creating array of %qT", type);
 	    return error_mark_node;
 	  }
-	if (ABSTRACT_CLASS_TYPE_P (type))
-	  {
-	    if (complain & tf_error)
-	      error ("creating array of %qT, which is an abstract class type",
-		     type);
-	    return error_mark_node;
-	  }
+
+	if (abstract_virtuals_error_sfinae (NULL_TREE, type, complain))
+	  return error_mark_node;
 
 	r = build_cplus_array_type (type, domain);
 

gcc/cp/typeck2.c

@@ -258,6 +258,10 @@ abstract_virtuals_error_sfinae (tree decl, tree type, tsubst_flags_t complain)
     return 0;
   type = TYPE_MAIN_VARIANT (type);
 
+  /* In SFINAE context, force instantiation.  */
+  if (!(complain & tf_error))
+    complete_type (type);
+
   /* If the type is incomplete, we register it within a hash table,
      so that we can check again once it is completed. This makes sense
      only for objects for which we have a declaration or at least a

gcc/testsuite/g++.dg/template/abstract-dr337.C

+// PR c++/17232 (DR 337)
+
+template<typename T>
+class A {
+  virtual void f() = 0;
+};
+
+template<typename T>
+void g(T (*a)[1]) {}		// { dg-error "abstract" }
+
+int main() {
+  g<A<int> >(0);  // { dg-error "no matching function" }
+}