From aba254d025f229a70fd96429adc6c88cf0a4a005 Mon Sep 17 00:00:00 2001
From: mpolacek <mpolacek@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Wed, 22 Feb 2017 19:31:49 +0000
Subject: 	PR c++/79653 	* parser.c (cp_parser_std_attribute_spec):
 Don't build the attribute 	if the alignas expression is erroneous. 
 * pt.c (tsubst_attribute): If tsubst_pack_expansion fails, return 
 error_mark_node.

	* g++.dg/cpp0x/alignas10.C: New test.
	* g++.dg/cpp0x/alignas9.C: New test.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@245657 138bc75d-0d04-0410-961f-82ee72b054a4
---
 gcc/cp/pt.c | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'gcc/cp/pt.c')

diff --git a/gcc/cp/pt.c b/gcc/cp/pt.c
index 38a01e168a7..5b0f62d3832 100644
--- a/gcc/cp/pt.c
+++ b/gcc/cp/pt.c
@@ -10012,6 +10012,8 @@ tsubst_attribute (tree t, tree *decl_p, tree args,
       /* An attribute pack expansion.  */
       tree purp = TREE_PURPOSE (t);
       tree pack = tsubst_pack_expansion (val, args, complain, in_decl);
+      if (pack == error_mark_node)
+	return error_mark_node;
       int len = TREE_VEC_LENGTH (pack);
       tree list = NULL_TREE;
       tree *q = &list;
-- 
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