re PR c++/80991 (ICE with __is_trivially_constructible in template)

/cp
2017-10-24  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/80991
	* pt.c (value_dependent_expression_p, [TRAIT_EXPR]): Handle
	a TREE_LIST as TRAIT_EXPR_TYPE2.

/testsuite
2017-10-24  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/80991
	* g++.dg/ext/is_trivially_constructible5.C: New.

From-SVN: r254051

gcc/cp/ChangeLog

+2017-10-24  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/80991
+	* pt.c (value_dependent_expression_p, [TRAIT_EXPR]): Handle
+	a TREE_LIST as TRAIT_EXPR_TYPE2.
+
 2017-10-24  Mukesh Kapoor  <mukesh.kapoor@oracle.com>
 	    Paolo Carlini  <paolo.carlini@oracle.com>
 

gcc/cp/pt.c

@@ -24019,8 +24019,21 @@ value_dependent_expression_p (tree expression)
     case TRAIT_EXPR:
       {
 	tree type2 = TRAIT_EXPR_TYPE2 (expression);
-	return (dependent_type_p (TRAIT_EXPR_TYPE1 (expression))
-		|| (type2 ? dependent_type_p (type2) : false));
+
+	if (dependent_type_p (TRAIT_EXPR_TYPE1 (expression)))
+	  return true;
+
+	if (!type2)
+	  return false;
+
+	if (TREE_CODE (type2) != TREE_LIST)
+	  return dependent_type_p (type2);
+
+	for (; type2; type2 = TREE_CHAIN (type2))
+	  if (dependent_type_p (TREE_VALUE (type2)))
+	    return true;
+
+	return false;
       }
 
     case MODOP_EXPR:

gcc/testsuite/ChangeLog

+2017-10-24  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/80991
+	* g++.dg/ext/is_trivially_constructible5.C: New.
+
 2017-10-24  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
 
 	* gcc.target/i386/387-ficom-1.c: Allow for ficomp without s

gcc/testsuite/g++.dg/ext/is_trivially_constructible5.C

+// PR c++/80991
+// { dg-do compile { target c++11 } }
+
+template<bool> void foo()
+{
+  static_assert(__is_trivially_constructible(int, int), "");
+}
+
+void bar()
+{
+  foo<true>();
+}