From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8A51BC433EF for ; Tue, 5 Apr 2022 12:43:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238332AbiDEMor (ORCPT ); Tue, 5 Apr 2022 08:44:47 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44030 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1357407AbiDELQY (ORCPT ); Tue, 5 Apr 2022 07:16:24 -0400 Received: from mail.skyhub.de (mail.skyhub.de [5.9.137.197]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C8E0F28E09; Tue, 5 Apr 2022 03:45:14 -0700 (PDT) Received: from zn.tnic (p2e55dff8.dip0.t-ipconnect.de [46.85.223.248]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.skyhub.de (SuperMail on ZX Spectrum 128k) with ESMTPSA id 7CE931EC02B9; Tue, 5 Apr 2022 12:45:09 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alien8.de; s=dkim; t=1649155509; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=6/5LBcy5siohW4oFuFeRpf6DCnAk2CessNOW+twB7uY=; b=LGiTheZnyXcmHnN6XZzLCW/0mEVkEf7wOP1WEXJasS41X6E41rojW0fFU3DUbi95ouWOvL +qP8ubIgpxNuiDJ8B7mOShS68hHBrzc1vZijoUZorxOdnSsPWpR5IuIr9pdd9saOH/pVq9 4QE0lYfd7DhP+R9IBCJqJS8WuA9tED4= Date: Tue, 5 Apr 2022 12:45:11 +0200 From: Borislav Petkov To: Richard Biener Cc: linux-toolchains@vger.kernel.org, Michael Matz , lkml Subject: Re: older gccs and case labels producing integer constants Message-ID: References: <7o5nn52-nqn1-oo13-s6o9-59r85r91o768@fhfr.qr> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-toolchains@vger.kernel.org On Tue, Apr 05, 2022 at 12:36:58PM +0200, Borislav Petkov wrote: > On Tue, Apr 05, 2022 at 12:06:45PM +0200, Richard Biener wrote: > > Wird auch mit gcc 11 rejected. Kanns sein dass mit gcc 7 andere > > compiler flags genommen werden? > > Found it: > > $ gcc -fsanitize=shift -c switch.c > switch.c: In function ‘foo’: > switch.c:10:7: error: case label does not reduce to an integer constant > case (((0xfc08) << 16) | (0x0101)):; > > $ gcc --version > gcc (SUSE Linux) 7.4.1 20190905 [gcc-7-branch revision 275407] > Copyright (C) 2017 Free Software Foundation, Inc. > > Something not fully backported? Ok, not really: gcc-10 -fsanitize=shift -c switch.c switch.c: In function ‘foo’: switch.c:10:7: error: case label does not reduce to an integer constant 10 | case (((0xfc08) << 16) | (0x0101)):; | ^~~~ BUT! when more switches are set with gcc-10 (full gcc cmdline from a kernel build), then that passes. But it doesn't pass with gcc-7. Weird... -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette