From: Jakub Jelinek <jakub@redhat.com>
Date: Fri, 22 Jun 2018 21:04:25 +0000 (+0200)
Subject: backport: re PR c++/85147 (ICE with invalid variadic template-template parameter)
X-Git-Tag: releases/gcc-7.4.0~344
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=379d4cf94031bd16f01226647cda41ff9387d0a0;p=thirdparty%2Fgcc.git

backport: re PR c++/85147 (ICE with invalid variadic template-template parameter)

	Backported from mainline
	2018-04-03  Jakub Jelinek  <jakub@redhat.com>

	PR c++/85147
	* pt.c (fixed_parameter_pack_p_1): Punt if parm is error_mark_node.

	* g++.dg/cpp0x/pr85147.C: New test.

From-SVN: r261945
---

diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog
index b21322cb5494..062384e41156 100644
--- a/gcc/cp/ChangeLog
+++ b/gcc/cp/ChangeLog
@@ -3,6 +3,9 @@
 	Backported from mainline
 	2018-04-03  Jakub Jelinek  <jakub@redhat.com>
 
+	PR c++/85147
+	* pt.c (fixed_parameter_pack_p_1): Punt if parm is error_mark_node.
+
 	PR c++/85140
 	* name-lookup.c (handle_namespace_attrs): Return early if attributes
 	is error_mark_node.
diff --git a/gcc/cp/pt.c b/gcc/cp/pt.c
index b9189d3fe934..5e79bc90af5d 100644
--- a/gcc/cp/pt.c
+++ b/gcc/cp/pt.c
@@ -4864,7 +4864,7 @@ static void
 fixed_parameter_pack_p_1 (tree parm, struct find_parameter_pack_data *ppd)
 {
   /* A type parm can't refer to another parm.  */
-  if (TREE_CODE (parm) == TYPE_DECL)
+  if (TREE_CODE (parm) == TYPE_DECL || parm == error_mark_node)
     return;
   else if (TREE_CODE (parm) == PARM_DECL)
     {
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index e7fbda1082ae..84abc4f8e37e 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -3,6 +3,9 @@
 	Backported from mainline
 	2018-04-03  Jakub Jelinek  <jakub@redhat.com>
 
+	PR c++/85147
+	* g++.dg/cpp0x/pr85147.C: New test.
+
 	PR c++/85140
 	* g++.dg/cpp0x/gen-attrs-64.C: New test.
 
diff --git a/gcc/testsuite/g++.dg/cpp0x/pr85147.C b/gcc/testsuite/g++.dg/cpp0x/pr85147.C
new file mode 100644
index 000000000000..68c0022d80a0
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp0x/pr85147.C
@@ -0,0 +1,9 @@
+// PR c++/85147
+// { dg-do compile { target c++11 } }
+
+template<typename T> struct A
+{
+  template<template<...T> class...> struct B {};	// { dg-error "expected|mismatch" }
+};
+
+A<int>::B<> b;						// { dg-error "does not name a template type" }