From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: ludo@gnu.org (Ludovic =?iso-8859-1?Q?Court=E8s?=) Newsgroups: gmane.lisp.guile.devel Subject: `SCM_MAKE_CHAR ()' signedness issue Date: Sat, 15 Aug 2009 14:00:29 +0200 Message-ID: <87y6pll21u.fsf@gnu.org> NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Trace: ger.gmane.org 1250338025 29502 80.91.229.12 (15 Aug 2009 12:07:05 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sat, 15 Aug 2009 12:07:05 +0000 (UTC) To: guile-devel@gnu.org Original-X-From: guile-devel-bounces+guile-devel=m.gmane.org@gnu.org Sat Aug 15 14:06:58 2009 Return-path: Envelope-to: guile-devel@m.gmane.org Original-Received: from lists.gnu.org ([199.232.76.165]) by lo.gmane.org with esmtp (Exim 4.50) id 1McI2A-0000kD-HH for guile-devel@m.gmane.org; Sat, 15 Aug 2009 14:06:54 +0200 Original-Received: from localhost ([127.0.0.1]:54981 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1McI29-0004Ie-Gp for guile-devel@m.gmane.org; Sat, 15 Aug 2009 08:06:53 -0400 Original-Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1McHwM-0002rJ-M4 for guile-devel@gnu.org; Sat, 15 Aug 2009 08:00:55 -0400 Original-Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1McHwH-0002p9-JB for guile-devel@gnu.org; Sat, 15 Aug 2009 08:00:54 -0400 Original-Received: from [199.232.76.173] (port=44531 helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1McHwH-0002p3-1i for guile-devel@gnu.org; Sat, 15 Aug 2009 08:00:49 -0400 Original-Received: from main.gmane.org ([80.91.229.2]:43351 helo=ciao.gmane.org) by monty-python.gnu.org with esmtps (TLS-1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.60) (envelope-from ) id 1McHwG-0004qA-D3 for guile-devel@gnu.org; Sat, 15 Aug 2009 08:00:48 -0400 Original-Received: from list by ciao.gmane.org with local (Exim 4.43) id 1McHwC-0006uS-7g for guile-devel@gnu.org; Sat, 15 Aug 2009 12:00:44 +0000 Original-Received: from reverse-83.fdn.fr ([80.67.176.83]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Sat, 15 Aug 2009 12:00:44 +0000 Original-Received: from ludo by reverse-83.fdn.fr with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Sat, 15 Aug 2009 12:00:44 +0000 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 33 Original-X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: reverse-83.fdn.fr X-URL: http://www.fdn.fr/~lcourtes/ X-Revolutionary-Date: 28 Thermidor an 217 de la =?iso-8859-1?Q?R=E9volutio?= =?iso-8859-1?Q?n?= X-PGP-Key-ID: 0xEA52ECF4 X-PGP-Key: http://www.fdn.fr/~lcourtes/ludovic.asc X-PGP-Fingerprint: 821D 815D 902A 7EAB 5CEE D120 7FBA 3D4F EB1F 5364 X-OS: x86_64-unknown-linux-gnu User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/23.1 (gnu/linux) Cancel-Lock: sha1:8q1Oz/sY+a2kb1exp0dZVi/v9jI= X-detected-operating-system: by monty-python.gnu.org: GNU/Linux 2.6, seldom 2.4 (older, 4) X-BeenThere: guile-devel@gnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: "Developers list for Guile, the GNU extensibility library" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: guile-devel-bounces+guile-devel=m.gmane.org@gnu.org Errors-To: guile-devel-bounces+guile-devel=m.gmane.org@gnu.org Xref: news.gmane.org gmane.lisp.guile.devel:9118 Archived-At: Hello, We still have troubles with the `(scm_t_int32) (x) < 0' test in `SCM_MAKE_CHAR ()': --8<---------------cut here---------------start------------->8--- ludo@gcc54:~/guile-1.9.1/+build$ cat ,,t.c int foo (unsigned char x) { return (((int)x) < 0 ? 1 : -1); } ludo@gcc54:~/guile-1.9.1/+build$ gcc -Wall -c ,,t.c ,,t.c: In function ‘foo’: ,,t.c:4: warning: comparison is always false due to limited range of data type ludo@gcc54:~/guile-1.9.1/+build$ ../build-aux/config.guess sparc64-unknown-linux-gnu ludo@gcc54:~/guile-1.9.1/+build$ gcc --version gcc (GCC) 4.1.2 20061115 (prerelease) (Debian 4.1.1-21) Copyright (C) 2006 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. --8<---------------cut here---------------end--------------->8--- The problem occurs, e.g., in `string_titlecase_x ()'. Surprisingly, GCC 4.4 on x86_64-linux-gnu doesn't yield any warning for the example above. I'm not sure how to fix it, so we'll see for the next release. Thanks, Ludo'.