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From: "mpolacek at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/94775] [8/9/10 Regression] ICE in strip_typedefs, at
 cp/tree.c:1734 since r8-4668-g8a5ee94a082b3d48
Date: Wed, 29 Apr 2020 17:31:30 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94775

--- Comment #7 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
So a fix could be this, but maybe it would make us create a lot more varian=
ts
(?):

--- a/gcc/tree.c
+++ b/gcc/tree.c
@@ -6493,7 +6493,8 @@ check_base_type (const_tree cand, const_tree base)
                    TYPE_ATTRIBUTES (base)))
     return false;
   /* Check alignment.  */
-  if (TYPE_ALIGN (cand) =3D=3D TYPE_ALIGN (base))
+  if (TYPE_ALIGN (cand) =3D=3D TYPE_ALIGN (base)
+      && TYPE_USER_ALIGN (cand) =3D=3D TYPE_USER_ALIGN (base))
     return true;
   /* Atomic types increase minimal alignment.  We must to do so as well
      or we get duplicated canonical types. See PR88686.  */
@@ -6528,6 +6529,7 @@ check_aligned_type (const_tree cand, const_tree base,
unsigned int align)
      && TYPE_CONTEXT (cand) =3D=3D TYPE_CONTEXT (base)
      /* Check alignment.  */
      && TYPE_ALIGN (cand) =3D=3D align
+     && TYPE_USER_ALIGN (cand) =3D=3D TYPE_USER_ALIGN (base)
      && attribute_list_equal (TYPE_ATTRIBUTES (cand),
                   TYPE_ATTRIBUTES (base))
      && check_lang_type (cand, base));=