From c8b0571e334792c0c789438617cfb7faf86ab599 Mon Sep 17 00:00:00 2001
From: Marek Polacek <polacek@redhat.com>
Date: Thu, 24 Feb 2022 16:41:53 -0500
Subject: [PATCH] c++: ICE with attribute on enumerator [PR104667]

When processing a template, the enumerators we build don't have a type
yet.  But is_late_template_attribute is not prepared to see a _DECL
without a type, so we crash on

  enum tree_code code = TREE_CODE (type);

(I found that we don't give the "is deprecated" warning for the enumerator
'f' in the test.  Reported as PR104682.)

	PR c++/104667

gcc/cp/ChangeLog:

	* decl2.cc (is_late_template_attribute): Cope with a decl without
	a type.

gcc/testsuite/ChangeLog:

	* g++.dg/ext/attrib64.C: New test.
---
 gcc/cp/decl2.cc                     |  3 +++
 gcc/testsuite/g++.dg/ext/attrib64.C | 11 +++++++++++
 2 files changed, 14 insertions(+)
 create mode 100644 gcc/testsuite/g++.dg/ext/attrib64.C

diff --git a/gcc/cp/decl2.cc b/gcc/cp/decl2.cc
index 2e58419ea51..22edc2ba7f9 100644
--- a/gcc/cp/decl2.cc
+++ b/gcc/cp/decl2.cc
@@ -1298,6 +1298,9 @@ is_late_template_attribute (tree attr, tree decl)
     {
       tree type = TYPE_P (decl) ? decl : TREE_TYPE (decl);
 
+      if (!type)
+	return true;
+
       /* We can't apply any attributes to a completely unknown type until
 	 instantiation time.  */
       enum tree_code code = TREE_CODE (type);
diff --git a/gcc/testsuite/g++.dg/ext/attrib64.C b/gcc/testsuite/g++.dg/ext/attrib64.C
new file mode 100644
index 00000000000..4a4505fc4b2
--- /dev/null
+++ b/gcc/testsuite/g++.dg/ext/attrib64.C
@@ -0,0 +1,11 @@
+// PR c++/104667
+// { dg-do compile }
+
+template<typename> struct A {
+  enum E { // { dg-warning "only applies to function types" }
+    e __attribute__ ((access(read_only))),
+    f __attribute__ ((deprecated))
+  };
+};
+
+A<int> a;
-- 
2.11.4.GIT