From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 3D85C385842F; Fri, 11 Feb 2022 22:57:45 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 3D85C385842F From: "pinskia at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug c/104506] [12 Regression] ICE: tree check: expected class 'type', have 'exceptional' (error_mark) in useless_type_conversion_p, at gimple-expr.cc:87 on invalid symbol redeclaration Date: Fri, 11 Feb 2022 22:57:45 +0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: c X-Bugzilla-Version: 12.0 X-Bugzilla-Keywords: error-recovery, ice-on-invalid-code X-Bugzilla-Severity: trivial X-Bugzilla-Who: pinskia at gcc dot gnu.org X-Bugzilla-Status: ASSIGNED X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: pinskia at gcc dot gnu.org X-Bugzilla-Target-Milestone: 12.0 X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: gcc-bugs@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gcc-bugs mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 11 Feb 2022 22:57:45 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104506 --- Comment #2 from Andrew Pinski --- The NOP_EXPR comes from: (gdb) up #1 0x0000000000b99a72 in c_process_expr_stmt (loc=3D266752, expr=3D) at /home/apinski/src/upstream-gcc/gcc/gcc/c/c-typeck.cc:11356 11356 expr =3D build1 (NOP_EXPR, TREE_TYPE (expr), expr); (gdb) l 11351 11352 /* If the expression is not of a type to which we cannot assign a line 11353 number, wrap the thing in a no-op NOP_EXPR. */ 11354 if (DECL_P (expr) || CONSTANT_CLASS_P (expr)) 11355 { 11356 expr =3D build1 (NOP_EXPR, TREE_TYPE (expr), expr); 11357 SET_EXPR_LOCATION (expr, loc); 11358 } But if you had a cast to void, it would come from somewhere else. The strip is: /* Strip away as many useless type conversions as possible at the toplevel. */ STRIP_USELESS_TYPE_CONVERSION (*expr_p); Now do we want to add a check inside STRIP_USELESS_TYPE_CONVERSION for error_mark_node, I am still deciding.=