From owner-freebsd-current@FreeBSD.ORG  Tue Jul 22 11:26:18 2003
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
Delivered-To: freebsd-current@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id ECC3E37B401
	for <current@freebsd.org>; Tue, 22 Jul 2003 11:26:18 -0700 (PDT)
Received: from harmony.village.org (rover.bsdimp.com [204.144.255.66])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 399DF43F75
	for <current@freebsd.org>; Tue, 22 Jul 2003 11:26:18 -0700 (PDT)
	(envelope-from imp@bsdimp.com)
Received: from localhost (warner@rover2.village.org [10.0.0.1])
	by harmony.village.org (8.12.9/8.12.3) with ESMTP id h6MIQAFL050695;
	Tue, 22 Jul 2003 12:26:10 -0600 (MDT)
	(envelope-from imp@bsdimp.com)
Date: Tue, 22 Jul 2003 12:26:03 -0600 (MDT)
Message-Id: <20030722.122603.65161896.imp@bsdimp.com>
To: kientzle@acm.org
From: "M. Warner Losh" <imp@bsdimp.com>
In-Reply-To: <3F1C18CB.6030201@acm.org>
References: <3F1C1695.30409@acm.org>
	<20030721163719.GI12996@roark.gnf.org>
	<3F1C18CB.6030201@acm.org>
X-Mailer: Mew version 2.2 on Emacs 21.3 / Mule 5.0 (SAKAKI)
Mime-Version: 1.0
Content-Type: Text/Plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
cc: loschert@servint.com
cc: current@freebsd.org
Subject: Re: Buildworld fails in 5.1
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: Discussions about the use of FreeBSD-current
	<freebsd-current.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current>
List-Post: <mailto:freebsd-current@freebsd.org>
List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 22 Jul 2003 18:26:19 -0000

In message: <3F1C18CB.6030201@acm.org>
            Tim Kientzle <kientzle@acm.org> writes:
: Gordon Tetlow wrote:
: > On Mon, Jul 21, 2003 at 09:36:37AM -0700, Tim Kientzle wrote:
: >>Hmmm...  Is that what .ORDER is for?  To work around a
: >>parallel make that gratuitously rebuilds things?
: > 
: > Right it serializes build dependencies. The problem with crunchgen ...
: 
: I would argue "the problem with make"... ;-)  I think it's pretty
: clear that
: 
: a b c: foo
:      buildabc
: 
: does not require that 'buildabc' be run three times.  Make
: should be able to note that 'buildabc' was already spawned
: for 'a' and just add 'b' and 'c' to the wait list for
: that operation, rather than running additional copies.

That's not how make works.

a b c: foo
	buildabc

is the same as:

a: foo
	buildabc
b: foo
	buildabc
c: foo
	buildabc