[PATCH] attribs: Don't crash on NULL TREE_TYPE in diag_attr_exclusions [PR114634]

[Jakub Jelinek <jakub@redhat.com>]

Hi!

The enumerator still doesn't have TREE_TYPE set but diag_attr_exclusions
assumes that all decls must have types.
I think it is better in something as unimportant as diag_attr_exclusions
to be more robust, if there is no type, it can just diagnose exclusions
on the DECL_ATTRIBUTES, like for types it only diagnoses it on
TYPE_ATTRIBUTES.

Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?

2024-04-15  Jakub Jelinek  <jakub@redhat.com>

	PR c++/114634
	* attribs.cc (diag_attr_exclusions): Set attrs[1] to NULL_TREE for
	decls with NULL TREE_TYPE.

	* g++.dg/ext/attrib68.C: New test.

--- gcc/attribs.cc.jj	2024-02-12 20:44:52.409074876 +0100
+++ gcc/attribs.cc	2024-04-12 18:29:52.000381917 +0200
@@ -468,7 +468,10 @@ diag_attr_exclusions (tree last_decl, tr
   if (DECL_P (node))
     {
       attrs[0] = DECL_ATTRIBUTES (node);
-      attrs[1] = TYPE_ATTRIBUTES (TREE_TYPE (node));
+      if (TREE_TYPE (node))
+	attrs[1] = TYPE_ATTRIBUTES (TREE_TYPE (node));
+      else
+	attrs[1] = NULL_TREE;
     }
   else
     {
--- gcc/testsuite/g++.dg/ext/attrib68.C.jj	2024-04-12 18:31:38.100968098 +0200
+++ gcc/testsuite/g++.dg/ext/attrib68.C	2024-04-12 18:30:57.011515625 +0200
@@ -0,0 +1,8 @@
+// PR c++/114634
+// { dg-do compile }
+
+template <int N>
+struct A
+{
+  enum { e __attribute__ ((aligned (16))) };	// { dg-error "alignment may not be specified for 'e'" }
+};

	Jakub