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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/95985] [11 Regression] ICE: tree check: expected tree_list, 
 have error_mark in common_handle_aligned_attribute, at
 c-family/c-attribs.c:1980
Date: Mon, 29 Jun 2020 19:28:38 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D95985

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P4
           Keywords|                            |error-recovery

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
While we could do something like:
--- c-attribs.c.jj      2020-06-10 14:58:17.422495938 +0200
+++ c-attribs.c 2020-06-29 21:25:58.300888506 +0200
@@ -1975,7 +1975,9 @@ common_handle_aligned_attribute (tree *n
      yet.  */
   tree last_decl =3D node[1] ? node[1] : *node;

-  if (args)
+  if (args =3D=3D error_mark_node)
+    align_expr =3D args;
+  else if (args)
     {
       align_expr =3D TREE_VALUE (args);
       if (align_expr && TREE_CODE (align_expr) !=3D IDENTIFIER_NODE
I don't think it scales well, because we have hundreds of *handle_*attribute
functions and all of them assume that args is either NULL or a TREE_LIST and
changing them doesn't look right.=