From owner-freebsd-questions@FreeBSD.ORG  Fri Aug 13 17:58:20 2010
Return-Path: <owner-freebsd-questions@FreeBSD.ORG>
Delivered-To: freebsd-questions@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id C9CE0106564A
	for <freebsd-questions@freebsd.org>;
	Fri, 13 Aug 2010 17:58:20 +0000 (UTC)
	(envelope-from swell.k@gmail.com)
Received: from mail-ew0-f54.google.com (mail-ew0-f54.google.com
	[209.85.215.54])
	by mx1.freebsd.org (Postfix) with ESMTP id F04628FC13
	for <freebsd-questions@freebsd.org>;
	Fri, 13 Aug 2010 17:58:19 +0000 (UTC)
Received: by ewy26 with SMTP id 26so1757262ewy.13
	for <freebsd-questions@freebsd.org>;
	Fri, 13 Aug 2010 10:58:19 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma;
	h=domainkey-signature:received:received:from:to:cc:subject:references
	:date:in-reply-to:message-id:user-agent:mime-version:content-type;
	bh=xEFJOVq8neQ5C0Sw6W9gGaJhQnoq27JOg7NQVyHIyEM=;
	b=A+Fdzy91DTJq4Llwyg33C87aiZgx+6ClnCVNGpSsBOIEyP2yjCPkaRqC9DEX7I7S2r
	m95vbXzC0wa7Gk01dMdwNYoihKqUNdF72O3iMzNxKZEsIiD/TfHZL0pJlzY3zaWYIb98
	HO/Ang+Se0PxcQziecnOm4I2bkp0RGet0DPdY=
DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma;
	h=from:to:cc:subject:references:date:in-reply-to:message-id
	:user-agent:mime-version:content-type;
	b=WXE0CA30tAcfL4ciinjsWZPdnXIyuH+5nOcLtKSIw9EqPwvqy4a2gNiEiwHPQ8eHgl
	2bNt+zoDtB5diOoyx5K389ljVao6SgCXH++UyAlm4tQUbDfmLnCgOmQS+6BuM/asORj1
	hBJ+643TE3VYaagbntNbOcU7wSdLpoLKwh+xo=
Received: by 10.216.86.15 with SMTP id v15mr1634522wee.9.1281722298534;
	Fri, 13 Aug 2010 10:58:18 -0700 (PDT)
Received: from localhost ([109.169.29.56])
	by mx.google.com with ESMTPS id k83sm1745615weq.14.2010.08.13.10.58.15
	(version=SSLv3 cipher=RC4-MD5); Fri, 13 Aug 2010 10:58:17 -0700 (PDT)
From: Anonymous <swell.k@gmail.com>
To: Yuri <yuri@rawbw.com>
References: <4C656E8F.8090105@rawbw.com>
	<20100813162429.GE18896@dan.emsphone.com> <4C65852B.807@rawbw.com>
Date: Fri, 13 Aug 2010 21:58:10 +0400
In-Reply-To: <4C65852B.807@rawbw.com> (yuri@rawbw.com's message of "Fri, 13
	Aug 2010 10:47:23 -0700")
Message-ID: <868w4av1hp.fsf@gmail.com>
User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.0.50 (berkeley-unix)
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Cc: freebsd-questions@freebsd.org
Subject: Re: Documentation on how to build 32bit applications on amd64?
X-BeenThere: freebsd-questions@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: User questions <freebsd-questions.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
	<mailto:freebsd-questions-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-questions>
List-Post: <mailto:freebsd-questions@freebsd.org>
List-Help: <mailto:freebsd-questions-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
	<mailto:freebsd-questions-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 13 Aug 2010 17:58:20 -0000

Yuri <yuri@rawbw.com> writes:

> --- output of 64 bit executable (gcc -o m m.c) ---
> match: off=0 so=3 eo=4
> match: off=4 so=3 eo=4
>
> --- output of 32 bit executable built on 64 bit system with flags (gcc
> -B/usr/lib32 -m32 -o m m.c) ---
> match: off=0 so=3 eo=0

I guess machine-dependent headers are involved.

  $ cc -m32 -B/usr/lib32 a.c
  $ ./a.out
  match: off=0 so=3 eo=0
  $ ln -s /usr/src/sys/i386/include machine
  $ cc -m32 -B/usr/lib32 -isystem. a.c
  $ ./a.out
  match: off=0 so=3 eo=4
  match: off=4 so=3 eo=4

Same thing is happening for mmap()
  http://docs.freebsd.org/cgi/mid.cgi?20100524.134955.2300883222251175323.okuno.kohji