From: "Dave Korn" <dave.korn@artimi.com>
To: <cygwin@cygwin.com>
References: <490A30C8.5000107@sh.cvut.cz> <001601c93b31$a961b940$4001a8c0@mycomputer> <003e01c93b42$e92a17a0$4001a8c0@mycomputer> <490AE8A0.8090009@sh.cvut.cz> <001a01c93b4d$617de150$4001a8c0@mycomputer> <490AF1E3.3020308@sh.cvut.cz> <007401c93b56$ebcfa510$4001a8c0@mycomputer> <490B0084.1070803@sh.cvut.cz> <008a01c93b5a$9338d300$4001a8c0@mycomputer> <490B078B.9030007@byu.net> <20081031135011.GB15518@calimero.vinschen.de> <490B21E9.80807@lysator.liu.se> <011601c93b6e$49bbb710$4001a8c0@mycomputer>
Subject: RE: cygwin g++ strictness
Date: Fri, 31 Oct 2008 15:42:29 -0000
Message-ID: <02bd01c93b6f$4858d640$9601a8c0@CAM.ARTIMI.COM>
MIME-Version: 1.0
Content-Type: text/plain; 	charset="us-ascii"
Content-Transfer-Encoding: 7bit
In-Reply-To: <011601c93b6e$49bbb710$4001a8c0@mycomputer>
Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm
Precedence: bulk
Sender: cygwin-owner@cygwin.com
Mail-Followup-To: cygwin@cygwin.com

John Emmas wrote on 31 October 2008 15:35:

> is it reasonable for a programmer to assume that a type declared as
> int32_t will be compatible with "%d" when building for a 32-bit platform?

  The /only/ assumptions you may legitimately make are those encoded in the C
language spec: sizeof (char) <= sizeof (short) <= sizeof (int) <= sizeof
(long) <= sizeof (long long).  But "<=" means less than OR equal, and you
can't assume /which/ of those two.

> I'd be surprised if there's a programmer amongst us who can honestly say
> he wouldn't have made that assumption.

  It's worked in the past.  But now there are 64-bit platforms in common use
and we all have to be aware.


    cheers,
      DaveK
-- 
Can't think of a witty .sigline today....


--
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/