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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/94162] ICE [neg] bad return type in defaulted <=>
Date: Mon, 09 Aug 2021 09:03:44 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94162

--- Comment #12 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
At least the #c8 testcase got fixed with
r12-619-gfc178519771db508c03611cff4a1466cf67fce1d
but that hasn't been backported to 11.x.

The ICE with int * return type is because POINTER_TYPE has NULL
TYPE_LINKAGE_IDENTIFIER, and cat_type_for is called on such type.
--- gcc/cp/method.c.jj  2021-06-28 22:38:27.014617793 +0200
+++ gcc/cp/method.c     2021-08-09 10:59:02.324443669 +0200
@@ -1029,6 +1029,8 @@ is_cat (tree type, comp_cat_tag tag)
 static comp_cat_tag
 cat_tag_for (tree type)
 {
+  if (!TYPE_LINKAGE_IDENTIFIER (type))
+    return cc_last;
   for (int i =3D 0; i < cc_last; ++i)
     {
       comp_cat_tag tag =3D (comp_cat_tag)i;
would fix this (or shall we instead test if (!CLASS_TYPE_P (type)) or somet=
hing
similar?=