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

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.

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.

(cherry picked from commit 7ec54f5fdfec298812a749699874db4d6a7246bb)

diff --git a/gcc/attribs.cc b/gcc/attribs.cc
index 080b95928ebf0a7348d117264d5602bbefda06a7..24818c76f70d40c2a97b14e482953611a951a668 100644 (file)
--- a/gcc/attribs.cc
+++ b/gcc/attribs.cc
@@ -480,7 +480,12 @@ diag_attr_exclusions (tree last_decl, tree node, tree attrname,
   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
+       /* TREE_TYPE can be NULL e.g. while processing attributes on
+          enumerators.  */
+       attrs[1] = NULL_TREE;
     }
   else
     {

diff --git a/gcc/testsuite/g++.dg/ext/attrib68.C b/gcc/testsuite/g++.dg/ext/attrib68.C
new file mode 100644 (file)
index 0000000..be3b110
--- /dev/null
+++ b/gcc/testsuite/g++.dg/ext/attrib68.C
@@ -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'" }
+};