X-Recipient: archive-cygwin AT delorie DOT com
X-SWARE-Spam-Status: No, hits=-2.1 required=5.0 	tests=AWL,BAYES_00
X-Spam-Check-By: sourceware.org
Date: Mon, 29 Dec 2008 10:59:06 -0600
From: Brian Ford <Brian DOT Ford AT FlightSafety DOT com>
Reply-To: cygwin AT cygwin DOT com
To: cygwin AT cygwin DOT com
Subject: Re: Cygwin struct alignment
In-Reply-To: <Pine.CYG.4.58.0812291032260.2944@PC1163-8460-XP.flightsafety.com>
Message-ID: <Pine.CYG.4.58.0812291057130.2944@PC1163-8460-XP.flightsafety.com>
References: <006b01c965c1$6a7c6300$4001a8c0 AT mycomputer>   <003a01c965fe$539063c0$4001a8c0 AT mycomputer> <495291CD DOT 1000207 AT bmts DOT com>   <004701c96993$ea2fa5f0$4001a8c0 AT mycomputer>  <Pine DOT CYG DOT 4 DOT 58 DOT 0812291032260 DOT 2944 AT PC1163-8460-XP DOT flightsafety DOT com>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
X-IsSubscribed: yes
Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm
Precedence: bulk
List-Id: <cygwin.cygwin.com>
List-Unsubscribe: <mailto:cygwin-unsubscribe-archive-cygwin=delorie DOT com AT cygwin DOT 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

On Mon, 29 Dec 2008, Brian Ford wrote:

> The only major difference I'm aware of is that Cygwin defaults to 8 byte
> alignment for long long and double for performance reasons, while MSVC
> defaults to 4 byte alignment for those types I believe.

Actually, I remebered one more difference.  I think MSVC bit fields don't
pack into padding holes left by variables of differing type and vice
versa.  Hope that helps.

-- 
Brian Ford
Staff Realtime Software Engineer
VITAL - Visual Simulation Systems
FlightSafety International
the best safety device in any aircraft is a well-trained crew...

--
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/