GNU bug report logs - #8912
cross-compile code for LD setup does not use the right system macro

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Eric PAIRE <eric.paire <at> st.com>
To: "bug-libtool <at> gnu.org" <bug-libtool <at> gnu.org>
Subject: cross-compile code for LD setup does not use the right system macro
Date: Tue, 21 Jun 2011 14:12:02 +0200

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Hi all,

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.

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.

You will find attached a fix proposal.

Thanks,
Eric PAIRE

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Message #8 received at 8912 <at> debbugs.gnu.org (full text, mbox):

From: Mike Frysinger <vapier <at> gentoo.org>
To: Eric PAIRE <eric.paire <at> st.com>
Cc: 8912 <at> debbugs.gnu.org, "bug-libtool <at> gnu.org" <bug-libtool <at> gnu.org>
Subject: Re: cross-compile code for LD setup does not use the right system
 macro
Date: Tue, 16 Jan 2024 01:32:12 +0000 (UTC)

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

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