From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: =?utf-8?Q?=C3=93scar_Fuentes?= Newsgroups: gmane.emacs.devel Subject: Re: warnings compiling emacs28 with gcc 12.1 Date: Thu, 28 Jul 2022 19:12:00 +0200 Message-ID: <87bkt9rwkf.fsf@telefonica.net> References: <87h731vrmw.fsf@mail.jao.io> <83o7x9892n.fsf@gnu.org> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="36019"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (gnu/linux) To: emacs-devel@gnu.org Cancel-Lock: sha1:YFxTDjb1ez3fmQ4854GLZVjteKE= Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Thu Jul 28 19:13:48 2022 Return-path: Envelope-to: ged-emacs-devel@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1oH752-0009In-Ru for ged-emacs-devel@m.gmane-mx.org; Thu, 28 Jul 2022 19:13:48 +0200 Original-Received: from localhost ([::1]:40454 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1oH751-0000Dm-LE for ged-emacs-devel@m.gmane-mx.org; Thu, 28 Jul 2022 13:13:47 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:43134) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oH73U-0007Kn-7c for emacs-devel@gnu.org; Thu, 28 Jul 2022 13:12:12 -0400 Original-Received: from ciao.gmane.io ([116.202.254.214]:55744) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oH73S-000217-Ik for emacs-devel@gnu.org; Thu, 28 Jul 2022 13:12:11 -0400 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1oH73P-0007FW-Q7 for emacs-devel@gnu.org; Thu, 28 Jul 2022 19:12:07 +0200 X-Injected-Via-Gmane: http://gmane.org/ Received-SPF: pass client-ip=116.202.254.214; envelope-from=ged-emacs-devel@m.gmane-mx.org; helo=ciao.gmane.io X-Spam_score_int: -16 X-Spam_score: -1.7 X-Spam_bar: - X-Spam_report: (-1.7 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.io gmane.emacs.devel:292798 Archived-At: Eli Zaretskii writes: >> and there's another one about free that looks a bit scary: >> >> alloc.c: In function ‘lisp_free’: >> alloc.c:1052:3: warning: pointer ‘block’ used after ‘free’ [-Wuse-after-free] >> 1052 | mem_delete (mem_find (block)); >> | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ >> alloc.c:1050:3: note: call to ‘free’ here >> 1050 | free (block); >> | ^~~~~~~~~~~~ > > Another nonsense. Look in mem_find, and you will see that it uses its > argument as just a number, it never dereferences it. The warning is not about dereferencing the pointer.