X-Recipient: archive-cygwin AT delorie DOT com
X-SWARE-Spam-Status: No, hits=-2.4 required=5.0 	tests=AWL,BAYES_00,SPF_PASS
X-Spam-Check-By: sourceware.org
Message-ID: <4A3FF0E9.6040203@gmail.com>
Date: Mon, 22 Jun 2009 22:00:25 +0100
From: Dave Korn <dave DOT korn DOT cygwin AT googlemail DOT com>
User-Agent: Thunderbird 2.0.0.17 (Windows/20080914)
MIME-Version: 1.0
To: cygwin AT cygwin DOT com
Subject: Re: weird feature
References: <890c978b4ab3063f3d602834a99501f1 AT mail DOT smartmobili DOT com> <5bbe440b12fc56489f671909ca240bc3 AT mail DOT smartmobili DOT com> <a9a7d86093c421e3c645c2504ea9b6fe AT mail DOT smartmobili DOT com> <4A3FAC26 DOT 7030402 AT cygwin DOT com> <4A3FD3BE DOT 20601 AT gmail DOT com> <4A3FD71B DOT 4080405 AT sidefx DOT com>
In-Reply-To: <4A3FD71B.4080405@sidefx.com>
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 7bit
Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm
List-Id: <cygwin.cygwin.com>
List-Subscribe: <mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive: <http://sourceware.org/ml/cygwin/>
List-Post: <mailto:cygwin AT cygwin DOT com>
List-Help: <mailto:cygwin-help AT cygwin DOT com>, <http://sourceware.org/ml/#faqs>
Sender: cygwin-owner AT cygwin DOT com
Mail-Followup-To: cygwin AT cygwin DOT com
Delivered-To: mailing list cygwin AT cygwin DOT com

Edward Lam wrote:
> Dave Korn wrote:
>> Larry Hall (Cygwin) wrote:
>>
>>>   2. Use 'cygpath' to convert from DOS to Cygwin path forms and back as
>>>      needed.  This can get tricky/cumbersome in some cases.
>>
>> It can be a lot easier if you have a Makefile-based build system, where
>> you can do the conversion on things that you know need converting like 
>> $(SRC) and $(OBJS) and $(INCLUDEPATH) but not things like $(CFLAGS),
>> rather than if you try and write shell scripts to wrap the compiler and
>> parse the options. That can also be a good approach, but more work to get
>> it completely right.
> 
> In my experience, adding cygcheck does slow down a large build system
> *significantly* when adding cygpath's though.

  Makefile variable caching can be done(*).  And make very sure you use ":="
not "=" when assigning a variable that might contain a $(shell)!  There's
still bound to be some overhead, but you can do a lot to optimise it away.

    cheers,
      DaveK
-- 
(*) - http://www.cmcrossroads.com/content/view/7382/264/

--
Problem reports:       http://cygwin.com/problems.html
FAQ:                   http://cygwin.com/faq/
Documentation:         http://cygwin.com/docs.html
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple