GNU bug report logs - #68494
cross-compile code for LD setup does not use the right system macro

Message received at submit <at> debbugs.gnu.org:

Received: (at submit) by debbugs.gnu.org; 16 Jan 2024 01:32:28 +0000
From debbugs-submit-bounces <at> debbugs.gnu.org Mon Jan 15 20:32:28 2024
Received: from localhost ([127.0.0.1]:47323 helo=debbugs.gnu.org)
	by debbugs.gnu.org with esmtp (Exim 4.84_2)
	(envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>)
	id 1rPYJY-0007bw-7H
	for submit <at> debbugs.gnu.org; Mon, 15 Jan 2024 20:32:28 -0500
Received: from lists.gnu.org ([2001:470:142::17]:60068)
 by debbugs.gnu.org with esmtp (Exim 4.84_2)
 (envelope-from <vapier@HIDDEN>) id 1rPYJW-0007bY-00
 for submit <at> debbugs.gnu.org; Mon, 15 Jan 2024 20:32:27 -0500
Received: from eggs.gnu.org ([2001:470:142:3::10])
 by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)
 (Exim 4.90_1) (envelope-from <vapier@HIDDEN>) id 1rPYJP-0004gd-GY
 for bug-libtool@HIDDEN; Mon, 15 Jan 2024 20:32:19 -0500
Received: from woodpecker.gentoo.org ([140.211.166.183] helo=smtp.gentoo.org)
 by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_CHACHA20_POLY1305:256)
 (Exim 4.90_1) (envelope-from <vapier@HIDDEN>) id 1rPYJM-0001w9-HM
 for bug-libtool@HIDDEN; Mon, 15 Jan 2024 20:32:19 -0500
Received: by smtp.gentoo.org (Postfix, from userid 559)
 id DF95B3432A0; Tue, 16 Jan 2024 01:32:12 +0000 (UTC)
From: Mike Frysinger <vapier@HIDDEN>
To: Eric PAIRE <eric.paire@HIDDEN>
Subject: Re: cross-compile code for LD setup does not use the right system
 macro
User-Agent: GNU debbugs/0
Message-Id: <20240116013212.DF95B3432A0@HIDDEN>
Date: Tue, 16 Jan 2024 01:32:12 +0000 (UTC)
Received-SPF: pass client-ip=140.211.166.183; envelope-from=vapier@HIDDEN;
 helo=smtp.gentoo.org
X-Spam_score_int: -41
X-Spam_score: -4.2
X-Spam_bar: ----
X-Spam_report: (-4.2 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3,
 RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_PASS=-0.001,
 SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no
X-Spam_action: no action
X-Spam-Score: 0.6 (/)
X-Debbugs-Envelope-To: submit
Cc: 8912 <at> debbugs.gnu.org, "bug-libtool@HIDDEN" <bug-libtool@HIDDEN>
X-BeenThere: debbugs-submit <at> debbugs.gnu.org
X-Mailman-Version: 2.1.18
Precedence: list
List-Id: <debbugs-submit.debbugs.gnu.org>
List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, 
 <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe>
List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/>
List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org>
List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help>
List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, 
 <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe>
Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org
Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org>
X-Spam-Score: -0.4 (/)

On Tue, 21 Jun 2011 14:12:02 +0200, Eric PAIRE wrote:
> While compiling on 64-bit Linux a package that will be executed on a 32-bit Linux ([--build=x86_64-unknown-linux-gnu] --host=i686-pc-linux-gnu), I am facing an issue with the value of the LD macro generated in libtool, as the libtool part of configure does not add the '-m elf_i386' option for LD to generate a 32-bit object/program.

can you share an example project/configure/config.log showing the problem ?

> Actually, the problem is that libtool.m4 checks for the build system type with $host, whereas it should be $build. I have understood that $build is the system on which the program is generated (64-bit in my case) and $host the system on which the program created (32-bit in my case) is meant to run. So the right macro should test build system, and not host.

this is incorrect.  $build controls where things are compiling.
$host controls where the things will run.  please see:
https://www.gnu.org/savannah-checkouts/gnu/autoconf/manual/autoconf-2.72/html_node/Specifying-Target-Triplets.html
-mike