Mailing-List:	contact cygwin-help AT cygwin DOT com; run by ezmlm
List-Subscribe:	<mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive:	<http://sources.redhat.com/ml/cygwin/>
List-Post:	<mailto:cygwin AT cygwin DOT com>
List-Help:	<mailto:cygwin-help AT cygwin DOT com>, <http://sources.redhat.com/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
Message-ID:	<407C2244.1010509@cs.york.ac.uk>
Date:	Tue, 13 Apr 2004 18:24:20 +0100
From:	Chris Jefferson <caj AT cs DOT york DOT ac DOT uk>
User-Agent:	Mozilla Thunderbird 0.5 (Windows/20040207)
MIME-Version:	1.0
To:	Hans Horn <hannes AT 2horns DOT com>
CC:	cygwin AT cygwin DOT com
Subject:	Re: compilation with -mno-cygwin
References:	<c5h37b$6fk$1 AT sea DOT gmane DOT org>
In-Reply-To:	<c5h37b$6fk$1@sea.gmane.org>
X-IsSubscribed:	yes

Hans Horn wrote:

>I light of the recent gcc performance comparison, I tried to compile a
>number crunching application (for which I have noticed a significant
>performance degradation of a factor 2-3 since the days of gcc2.9.x) using
>the -mno-cygwin flag.
>I get a shitload of crap like the following :
>
>g++ -c -mno-cygwin -ansi -DGCC3X -DLINUX -DINLINE=inline -fno-default-inline
> -W -Wno-deprecated -fomit-frame-pointer -ffast-math -mcpu=pentium4 -march=p
>entium4 -mfpmath=sse -O2 -I./ -o xyz.o xyz.cpp
>  
>
<snip>

For a start, you shouldn't treat -mno-cygwin like linux (-DLINUX). 
-mno-cygwin turns g++ into a "pure" windows C++ compiler (hence the name 
of the flag).

-mno-cygwin should end up with files identical(ish) to those obtained by 
mingw I think.. what compile line did you use for that?

Chris
--
Badger, Badger, Badger, Badger, Badger, Badger, Badger, Badger... 
Mushroom! Mushroom!

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

- Raw text -