re PR c++/71739 (ICE on valid C++11 code: tree check: expected identifier_node,…

re PR c++/71739 (ICE on valid C++11 code: tree check: expected identifier_node, have tree_list in private_is_attribute_p, at tree.c:6080)

	PR c++/71739
	* tree.c (attribute_value_equal): Use get_attribute_name instead of
	directly using TREE_PURPOSE.

	* g++.dg/cpp0x/pr71739.C: New test.

From-SVN: r237991

gcc/ChangeLog

+2016-07-04  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/71739
+	* tree.c (attribute_value_equal): Use get_attribute_name instead of
+	directly using TREE_PURPOSE.
+
 2016-07-04  Jiong Wang  <jiong.wang@arm.com>
 
 	* config/aarch64/aarch64.h: Rename "ARMv8.1" to "ARMv8.1-A".

gcc/testsuite/ChangeLog

+2016-07-04  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/71739
+	* g++.dg/cpp0x/pr71739.C: New test.
+
 2016-07-04  Christophe Lyon  <christophe.lyon@linaro.org>
 
 	* c-c++-common/asan/clone-test-1.c (main): Handle clone() failure.

gcc/testsuite/g++.dg/cpp0x/pr71739.C

+// PR c++/71739
+// { dg-do compile { target c++11 } }
+
+template <int N> struct alignas(N) A;
+template <int N> struct alignas(N) A {};

gcc/tree.c

@@ -5009,7 +5009,7 @@ attribute_value_equal (const_tree attr1, const_tree attr2)
       && TREE_CODE (TREE_VALUE (attr2)) == TREE_LIST)
     {
       /* Handle attribute format.  */
-      if (is_attribute_p ("format", TREE_PURPOSE (attr1)))
+      if (is_attribute_p ("format", get_attribute_name (attr1)))
 	{
 	  attr1 = TREE_VALUE (attr1);
 	  attr2 = TREE_VALUE (attr2);