From owner-freebsd-hackers  Fri Feb 14  8:15:26 2003
Delivered-To: freebsd-hackers@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 4AE5737B401
	for <freebsd-hackers@FreeBSD.ORG>; Fri, 14 Feb 2003 08:15:25 -0800 (PST)
Received: from mta07-svc.ntlworld.com (mta07-svc.ntlworld.com [62.253.162.47])
	by mx1.FreeBSD.org (Postfix) with ESMTP id D610943F75
	for <freebsd-hackers@FreeBSD.ORG>; Fri, 14 Feb 2003 08:15:23 -0800 (PST)
	(envelope-from colin.percival@wadham.ox.ac.uk)
Received: from piii600.wadham.ox.ac.uk ([81.103.196.4])
          by mta07-svc.ntlworld.com
          (InterMail vM.4.01.03.27 201-229-121-127-20010626) with ESMTP
          id <20030214161522.GLPP3191.mta07-svc.ntlworld.com@piii600.wadham.ox.ac.uk>;
          Fri, 14 Feb 2003 16:15:22 +0000
Message-Id: <5.0.2.1.1.20030214155843.03e92e80@popserver.sfu.ca>
X-Sender: cperciva@popserver.sfu.ca
X-Mailer: QUALCOMM Windows Eudora Version 5.0.2
Date: Fri, 14 Feb 2003 16:15:16 +0000
To: freebsd-hackers@FreeBSD.ORG
From: Colin Percival <colin.percival@wadham.ox.ac.uk>
Subject: Re: libobjc wierdness
Cc: Chad David <davidc@issci.ca>
In-Reply-To: <5.0.2.1.1.20021217071753.02d1c4f8@popserver.sfu.ca>
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"; format=flowed
Sender: owner-freebsd-hackers@FreeBSD.ORG
Precedence: bulk
List-ID: <freebsd-hackers.FreeBSD.ORG>
List-Archive: <http://docs.freebsd.org/mail/> (Web Archive)
List-Help: <mailto:majordomo@FreeBSD.ORG?subject=help> (List Instructions)
List-Subscribe: <mailto:majordomo@FreeBSD.ORG?subject=subscribe%20freebsd-hackers>
List-Unsubscribe: <mailto:majordomo@FreeBSD.ORG?subject=unsubscribe%20freebsd-hackers>
X-Loop: FreeBSD.ORG

   Back in December, I was trying to work out why libobjc always compiled 
differently.  Now that I've worked it out, I thought I'd report back 
(mostly for the archives).
   It turns out that the variability is caused by gcc's mechanism for 
creating a unique name; when a file doesn't contain any programmer defined 
global names, gcc generates one from the file name and some extra 
stuff.  In gcc 2.95.4, this extra stuff is based on the time and pid; in 
later versions, it is based on the inode's device, number, and file 
modification time; and Nathan Sidwell has a patch which simply uses the 
full path of the file.
   Applying his patch (with some minor changes to make it fit 2.95.4), I've 
now got libobjc consistently building to the same file (apart from the 
easily handled library index).

Colin Percival


To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-hackers" in the body of the message