From owner-freebsd-questions@FreeBSD.ORG Thu Jul 12 22:31:39 2012 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id E1D981065672 for ; Thu, 12 Jul 2012 22:31:39 +0000 (UTC) (envelope-from mexas@bristol.ac.uk) Received: from dirj.bris.ac.uk (dirj.bris.ac.uk [137.222.10.78]) by mx1.freebsd.org (Postfix) with ESMTP id 96DAC8FC14 for ; Thu, 12 Jul 2012 22:31:39 +0000 (UTC) Received: from ncsc.bris.ac.uk ([137.222.10.41]) by dirj.bris.ac.uk with esmtp (Exim 4.72) (envelope-from ) id 1SpRv2-0004Xk-7y for freebsd-questions@freebsd.org; Thu, 12 Jul 2012 23:31:32 +0100 Received: from mech-cluster241.men.bris.ac.uk ([137.222.187.241]) by ncsc.bris.ac.uk with esmtpsa (TLSv1:AES256-SHA:256) (Exim 4.72) (envelope-from ) id 1SpRv1-0007CW-Qw for freebsd-questions@freebsd.org; Thu, 12 Jul 2012 23:31:32 +0100 Received: from mech-cluster241.men.bris.ac.uk (localhost [127.0.0.1]) by mech-cluster241.men.bris.ac.uk (8.14.5/8.14.5) with ESMTP id q6CMVVfs063615 for ; Thu, 12 Jul 2012 23:31:31 +0100 (BST) (envelope-from mexas@bris.ac.uk) Received: (from mexas@localhost) by mech-cluster241.men.bris.ac.uk (8.14.5/8.14.5/Submit) id q6CMVVmn063613 for freebsd-questions@freebsd.org; Thu, 12 Jul 2012 23:31:31 +0100 (BST) (envelope-from mexas@bris.ac.uk) X-Authentication-Warning: mech-cluster241.men.bris.ac.uk: mexas set sender to mexas@bris.ac.uk using -f Date: Thu, 12 Jul 2012 23:31:31 +0100 From: Anton Shterenlikht To: freebsd-questions@freebsd.org Message-ID: <20120712223130.GA58047@mech-cluster241.men.bris.ac.uk> Mail-Followup-To: freebsd-questions@freebsd.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.4.2.3i Subject: profiling library smaller than non-profiling, while it contains more symbols. Why? X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 12 Jul 2012 22:31:40 -0000 While updating my port (math/slatec) to use the new OPTIONS framework, I did some experiments with the profiling library. I don't know much about this, so what surprised me is that the profiling library is smaller: # ls -al lib*a -rw-r--r-- 1 root wheel 6582354 Jul 12 22:56 libslatec.a -rw-r--r-- 1 root wheel 6555122 Jul 12 23:02 libslatec_p.a # while it adds .mcount symbol to each object file: # nm libslatec.a > nm # nm libslatec_p.a > nmp # wc nm nmp 16436 36675 373033 nm 17885 39573 413605 nmp 34321 76248 786638 total # grep -c mcount nmp 1449 # expr 16436 + 1449 17885 # Using diff I can confirm that the only difference between the 2 libs is the .mcount symbol for each object file in the profiling library. So how can the profiling library be smaller? -- Anton Shterenlikht Room 2.6, Queen's Building Mech Eng Dept Bristol University University Walk, Bristol BS8 1TR, UK Tel: +44 (0)117 331 5944 Fax: +44 (0)117 929 4423