From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ian Campbell <Ian.Campbell@citrix.com>
Subject: Re: [PATCH 02/13] Config.mk: replace dependency to
 genpath with actual target
Date: Wed, 3 Sep 2014 11:28:49 +0100
Message-ID: <1409740129.15285.1.camel@citrix.com>
References: <1406538316-29087-1-git-send-email-olaf@aepfle.de>
	<1406538316-29087-3-git-send-email-olaf@aepfle.de>
	<1409083253.28009.20.camel@citrix.com>
	<20140827083648.GA5892@aepfle.de>
	<1409247292.21481.10.camel@citrix.com> <20140829063354.GA349@aepfle.de>
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
Return-path: <xen-devel-bounces@lists.xen.org>
In-Reply-To: <20140829063354.GA349@aepfle.de>
List-Unsubscribe: <http://lists.xen.org/cgi-bin/mailman/options/xen-devel>,
	<mailto:xen-devel-request@lists.xen.org?subject=unsubscribe>
List-Post: <mailto:xen-devel@lists.xen.org>
List-Help: <mailto:xen-devel-request@lists.xen.org?subject=help>
List-Subscribe: <http://lists.xen.org/cgi-bin/mailman/listinfo/xen-devel>,
	<mailto:xen-devel-request@lists.xen.org?subject=subscribe>
Sender: xen-devel-bounces@lists.xen.org
Errors-To: xen-devel-bounces@lists.xen.org
To: Olaf Hering <olaf@aepfle.de>
Cc: Keir Fraser <keir@xen.org>, Stefano Stabellini <stefano.stabellini@eu.citrix.com>, Tim Deegan <tim@xen.org>, Ian Jackson <ian.jackson@eu.citrix.com>, xen-devel@lists.xen.org, Jan Beulich <jbeulich@suse.com>, Samuel Thibault <samuel.thibault@ens-lyon.org>
List-Id: xen-devel@lists.xenproject.org

On Fri, 2014-08-29 at 08:33 +0200, Olaf Hering wrote:
> On Thu, Aug 28, Ian Campbell wrote:
> 
> > It seems that the bug here is that _paths.h is .PHONY then. Without that
> > the use of move-if-changed would prevent the output file changing
> > unnecessarily and make would not bother to rebuild the dependents.
> 
> It has to be checked every time to catch possible changes in the
> variables. How would that be checked without a .PHONY target, $(1) in
> this case?

Sounds like we need something similar to the FORCE target used by both
the xen subtree and Linux etc. See xen/Rules.mk.

Ian.