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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/108854] [10/11/12/13 Regression] tbb-2021.8.0 fails
 on i686-linux (32-bit), internal compiler error: in expand_expr_real_1, at
 expr.c:10281 since r10-4511-g6cf67b62c8cda035dccac
Date: Thu, 23 Feb 2023 15:55:09 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108854

--- Comment #11 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
I think the problem is that duplicate_thunk_for_node when copying the
FUNCTION_DECL node doesn't also copy DECL_ARGUMENTS (unless some changes to=
 the
arguments are needed).
--- gcc/cgraphclones.cc.jj      2023-02-22 20:50:27.417519830 +0100
+++ gcc/cgraphclones.cc 2023-02-23 16:02:29.653090584 +0100
@@ -218,7 +218,17 @@ duplicate_thunk_for_node (cgraph_node *t
       body_adj.modify_formal_parameters ();
     }
   else
-    new_decl =3D copy_node (thunk->decl);
+    {
+      new_decl =3D copy_node (thunk->decl);
+      for (tree *arg =3D &DECL_ARGUMENTS (new_decl);
+          *arg; arg =3D &DECL_CHAIN (*arg))
+       {
+         tree next =3D DECL_CHAIN (*arg);
+         *arg =3D copy_node (*arg);
+         DECL_CONTEXT (*arg) =3D new_decl;
+         DECL_CHAIN (*arg) =3D next;
+       }
+    }

   gcc_checking_assert (!DECL_STRUCT_FUNCTION (new_decl));
   gcc_checking_assert (!DECL_INITIAL (new_decl));
seems to fix the ICE.=