re PR c++/80449 (ICE reporting failed partial class template specialization…

re PR c++/80449 (ICE reporting failed partial class template specialization class template argument deduction)

/cp
2017-10-23  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/80449
	* semantics.c (finish_compound_literal): Check do_auto_deduction
	return value for error_mark_node.

/testsuite
2017-10-23  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/80449
	* g++.dg/cpp1z/class-deduction46.C: New.

From-SVN: r254026

gcc/cp/ChangeLog

+2017-10-23  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/80449
+	* semantics.c (finish_compound_literal): Check do_auto_deduction
+	return value for error_mark_node.
+
 2017-10-23  Jason Merrill  <jason@redhat.com>
 
 	PR c++/77369 - wrong noexcept handling in C++14 and below

gcc/cp/semantics.c

@@ -2711,8 +2711,12 @@ finish_compound_literal (tree type, tree compound_literal,
 
   if (tree anode = type_uses_auto (type))
     if (CLASS_PLACEHOLDER_TEMPLATE (anode))
-      type = do_auto_deduction (type, compound_literal, anode, complain,
-				adc_variable_type);
+      {
+	type = do_auto_deduction (type, compound_literal, anode, complain,
+				  adc_variable_type);
+	if (type == error_mark_node)
+	  return error_mark_node;
+      }
 
   if (processing_template_decl)
     {

gcc/testsuite/ChangeLog

+2017-10-23  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/80449
+	* g++.dg/cpp1z/class-deduction46.C: New.
+
 2017-10-23  Jakub Jelinek  <jakub@redhat.com>
 
 	PR debug/82630

gcc/testsuite/g++.dg/cpp1z/class-deduction46.C

+// PR c++/80449
+// { dg-options -std=c++17 }
+
+template<class S> struct C;
+template<> struct C<int> { C(int, int) {} };
+auto k = C{0, 0};  // { dg-error "cannot deduce" }