re PR c++/49102 ([C++0x] Use of deleted copy constructor not diagnosed)

	PR c++/49102
	* call.c (convert_arg_to_ellipsis): Call force_rvalue.

From-SVN: r174101

gcc/cp/ChangeLog

 2011-05-23  Jason Merrill  <jason@redhat.com>
 
+	PR c++/49102
+	* call.c (convert_arg_to_ellipsis): Call force_rvalue.
+
 	PR c++/49105
 	* typeck.c (cp_build_c_cast): Don't strip cv-quals when
 	converting to reference.

gcc/cp/call.c

@@ -5905,10 +5905,13 @@ convert_arg_to_ellipsis (tree arg)
       /* In a template (or ill-formed code), we can have an incomplete type
 	 even after require_complete_type, in which case we don't know
 	 whether it has trivial copy or not.  */
-      && COMPLETE_TYPE_P (arg_type)
-      && (type_has_nontrivial_copy_init (arg_type)
-	  || TYPE_HAS_NONTRIVIAL_DESTRUCTOR (arg_type)))
+      && COMPLETE_TYPE_P (arg_type))
     {
+      /* Build up a real lvalue-to-rvalue conversion in case the
+	 copy constructor is trivial but not callable.  */
+      if (CLASS_TYPE_P (arg_type))
+	force_rvalue (arg, tf_warning_or_error);
+
       /* [expr.call] 5.2.2/7:
 	 Passing a potentially-evaluated argument of class type (Clause 9)
 	 with a non-trivial copy constructor or a non-trivial destructor
@@ -5920,7 +5923,9 @@ convert_arg_to_ellipsis (tree arg)
 
 	 If the call appears in the context of a sizeof expression,
 	 it is not potentially-evaluated.  */
-      if (cp_unevaluated_operand == 0)
+      if (cp_unevaluated_operand == 0
+	  && (type_has_nontrivial_copy_init (arg_type)
+	      || TYPE_HAS_NONTRIVIAL_DESTRUCTOR (arg_type)))
 	error ("cannot pass objects of non-trivially-copyable "
 	       "type %q#T through %<...%>", arg_type);
     }

gcc/testsuite/ChangeLog

 2011-05-23  Jason Merrill  <jason@redhat.com>
 
+	* g++.dg/cpp0x/defaulted28.C: New.
+
 	* g++.dg/cpp0x/sfinae25.C: New.
 
 	* g++.dg/cpp0x/rv-cast2.C: New.

gcc/testsuite/g++.dg/cpp0x/defaulted28.C

+// PR c++/49102
+// { dg-options -std=c++0x }
+
+struct A {
+  A() = default;
+
+private:
+  A(A const&) = default;	// { dg-error "private" }
+};
+
+void f(...) { }
+int main() {
+  A a;
+  f(a); 			// { dg-error "this context" }
+}