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Debian bug tracking system administrator (administrator, Debian Bugs database) -------------------------------------- Received: (at submit) by bugs.debian.org; 2 Jun 2003 17:44:26 +0000 >From [EMAIL PROTECTED] Mon Jun 02 12:44:25 2003 Return-path: <[EMAIL PROTECTED]> Received: from cicero.e-mis.co.uk [212.240.194.162] by master.debian.org with esmtp (Exim 3.35 1 (Debian)) id 19MtIb-00044e-00; Mon, 02 Jun 2003 12:44:25 -0500 Received: from [10.139.58.254] (helo=tacitus) by cicero.e-mis.co.uk with esmtp (Exim 3.35 #1 (Debian)) id 19MtIa-0001vS-00 for <[EMAIL PROTECTED]>; Mon, 02 Jun 2003 18:40:44 +0100 Received: from james by tacitus with local (Exim 3.36 #1 (Debian)) id 19MtIZ-0000rU-00 for <[EMAIL PROTECTED]>; Mon, 02 Jun 2003 18:40:43 +0100 To: [EMAIL PROTECTED] Subject: gcc: bogus warning and/or mis-optimization on ia64 Mail-Copies-To: never From: James Troup <[EMAIL PROTECTED]> Date: Mon, 02 Jun 2003 18:40:43 +0100 Message-ID: <[EMAIL PROTECTED]> User-Agent: Gnus/5.090017 (Oort Gnus v0.17) Emacs/20.7 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: James Troup <[EMAIL PROTECTED]> Delivered-To: [EMAIL PROTECTED] X-Spam-Status: No, hits=-12.3 required=4.0 tests=BAYES_01,HAS_PACKAGE,USER_AGENT_GNUS_UA autolearn=ham version=2.53-bugs.debian.org_2003_05_24 X-Spam-Level: X-Spam-Checker-Version: SpamAssassin 2.53-bugs.debian.org_2003_05_24 (1.174.2.15-2003-03-30-exp) Package: gcc-3.3 Version: 3.3-2 | [EMAIL PROTECTED]:~/gdbm-1.8.3$ gcc -O2 -Wall -c gdbmopen.c | gdbmopen.c: In function `gdbm_open': | gdbmopen.c:15: warning: `lock_val' might be used uninitialized in this function | fstat (dbf->desc, &file_stat); | | if ((flags & GDBM_OPENMASK) == GDBM_READER) | { | if (dbf->file_locking) | { | struct flock flock; | flock.l_type = F_RDLCK; | flock.l_whence = SEEK_SET; | flock.l_start = flock.l_len = 0L; | lock_val = fcntl (dbf->desc, F_SETLK, &flock); | } | } | else if (dbf->file_locking) | { | struct flock flock; | flock.l_type = F_WRLCK; | flock.l_whence = SEEK_SET; | flock.l_start = flock.l_len = 0L; | lock_val = fcntl (dbf->desc, F_SETLK, &flock); | } | if (dbf->file_locking && (lock_val != 0)) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | { | return NULL; | } I think this warning is bogus because a) it only happens on ia64 (AFAICT, it doesn't happen on arm, i386 or hppa, at least), b) it only happens with optimization turned on (disappears with -O0) and c) if the (entirely unrelated) fstat call is commented out, the warning disappears. I also think that it's clear from the code above that lock_val couldn't be used uninitialized unless I'm missing something embarrassingly obvious. Unfortunately I haven't been able to determine if it's just a bogus warning or if the code's actually being mis-compiled. This isn't a regression, all previous versions of gcc (2.96, 3.0 and 3.2) for ia64 have the same problem and gcc-snapshot (20030531-2) doesn't fix it. http://people.debian.org/~troup/gcc/gdbm/ contains gdbmopen.{c,i}, fixed-gdbmopen.{c,i} (i.e. with the fstat commented out) and orig-gdbmopen.{c,i} (the unreduced original file from gdbm 1.8.3). -- James --------------------------------------- Received: (at 195834-done) by bugs.debian.org; 20 Sep 2003 04:17:43 +0000 >From [EMAIL PROTECTED] Fri Sep 19 23:17:41 2003 Return-path: <[EMAIL PROTECTED]> Received: from h24-77-96-253.sbm.shawcable.net (straylight.cyberhqz.com) [24.77.96.253] by master.debian.org with esmtp (Exim 3.35 1 (Debian)) id 1A0ZBl-0006Vp-00; Fri, 19 Sep 2003 23:17:41 -0500 Received: from cyberhq.internal.cyberhqz.com (cyberhq.internal.cyberhqz.com [192.168.0.2]) by straylight.cyberhqz.com (Postfix) with ESMTP id 123F354035 for <[EMAIL PROTECTED]>; Fri, 19 Sep 2003 21:17:41 -0700 (PDT) Received: by cyberhq.internal.cyberhqz.com (Postfix, from userid 1000) id C067D1B96F6; Fri, 19 Sep 2003 21:17:40 -0700 (PDT) Date: Fri, 19 Sep 2003 21:17:40 -0700 To: [EMAIL PROTECTED] Subject: documented defect Message-ID: <[EMAIL PROTECTED]> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.4i From: [EMAIL PROTECTED] (Ryan Murray) Delivered-To: [EMAIL PROTECTED] X-Spam-Status: No, hits=1.0 required=4.0 tests=BAYES_60 version=2.53-bugs.debian.org_2003_9_16 X-Spam-Level: * X-Spam-Checker-Version: SpamAssassin 2.53-bugs.debian.org_2003_9_16 (1.174.2.15-2003-03-30-exp) Upstream has closed this bug report with the following message: ------- Additional Comment #1 From Andrew Pinski 2003-06-29 13:47 ------- This is a know documented defect of gcc's warning about uninitialized variables. In fact gcc should warn about it on all platforms but it does not. Here is the sample from the documenation: { int save_y; if (change_y) save_y = y, y = new_y; ... if (change_y) y = save_y; } which is almost like your code but slightly different so this is not a bug.