From owner-freebsd-stable@FreeBSD.ORG Thu Jan 20 21:56:15 2005 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id DFF7A16A4CE for ; Thu, 20 Jan 2005 21:56:15 +0000 (GMT) Received: from gromit.dlib.vt.edu (gromit.dlib.vt.edu [128.173.49.29]) by mx1.FreeBSD.org (Postfix) with ESMTP id 81EDD43D4C for ; Thu, 20 Jan 2005 21:56:15 +0000 (GMT) (envelope-from paul@gromit.dlib.vt.edu) Received: from zappa.Chelsea-Ct.Org (pool-151-199-113-125.roa.east.verizon.net [151.199.113.125]) by gromit.dlib.vt.edu (8.13.1/8.13.1) with ESMTP id j0KLuEiB082444 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Thu, 20 Jan 2005 16:56:14 -0500 (EST) (envelope-from paul@gromit.dlib.vt.edu) Received: from zappa.Chelsea-Ct.Org (localhost.Chelsea-Ct.Org [127.0.0.1]) by zappa.Chelsea-Ct.Org (8.13.1/8.13.1) with ESMTP id j0KLu8m0000798 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Thu, 20 Jan 2005 16:56:09 -0500 (EST) (envelope-from paul@gromit.dlib.vt.edu) Received: (from paul@localhost) by zappa.Chelsea-Ct.Org (8.13.1/8.13.1/Submit) id j0KLu89Y000797; Thu, 20 Jan 2005 16:56:08 -0500 (EST) (envelope-from paul@gromit.dlib.vt.edu) X-Authentication-Warning: zappa.Chelsea-Ct.Org: paul set sender to paul@gromit.dlib.vt.edu using -f From: Paul Mather To: Mike Jakubik In-Reply-To: <52406.207.219.213.162.1106257499.squirrel@207.219.213.162> References: <3aaaa3a0501181530975fecf@mail.gmail.com> <3aaaa3a050120105459f7d015@mail.gmail.com> <3aaaa3a050120111777ada357@mail.gmail.com> <1106256780.582.5.camel@zappa.Chelsea-Ct.Org> <52406.207.219.213.162.1106257499.squirrel@207.219.213.162> Content-Type: text/plain Content-Transfer-Encoding: 7bit Date: Thu, 20 Jan 2005 16:56:07 -0500 Message-Id: <1106258167.582.10.camel@zappa.Chelsea-Ct.Org> Mime-Version: 1.0 X-Mailer: Evolution 2.0.3 FreeBSD GNOME Team Port cc: freebsd-stable@freebsd.org Subject: Re: CFLAGS=-O2 -pipe problems in RELENG_5 ? X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 20 Jan 2005 21:56:16 -0000 On Thu, 2005-01-20 at 16:44 -0500, Mike Jakubik wrote: > Paul Mather said: > > > On Thu, 2005-01-20 at 19:17 +0000, Chris wrote: > >> what does -fno-strict-alias do? I cannot find it in man gcc > > > > It is a truncation of "-fno-strict-aliasing". The flag does not appear > > to be described in the gcc man page, but is documented in the gcc info > > page (search for "-fstrict-aliasing"). To quote the info page, > > -fstrict-aliasing "allows the compiler to assume the strictest aliasing > > rules applicable to the language being compiled. ..." > > Wouldn't we want strict aliasing then? Yes, but unfortunately some ports circumvent the strict aliasing rules, which is why those ports break when building with -O2 (which causes -fstrict-aliasing to be enabled). Cheers, Paul. -- e-mail: paul@gromit.dlib.vt.edu "Without music to decorate it, time is just a bunch of boring production deadlines or dates by which bills must be paid." --- Frank Vincent Zappa