Newbie Linux From Scratch Question on Compiling 32 bit

kostly · 09-10-2016, 03:49 PM

Hi All,

Sorry if this post seems simple, but I've been struggling with this for some time now, and am unsure of where I'm going wrong. I'm trying to build a 32 bit LFS only (no 64 bit at all), but whenever I try on my 32 bit Ubuntu 14.04 machine, it keeps attempting to build the 64 bit files as well. I've been searching for a while, and am unable to which setting I need to manipulate in order to fix this. Any help would be greatly appreciated!

Krejzi · 09-10-2016, 04:02 PM

It shouldn't be attempting to build for 64 bit. Post the exact output where you think this happens and someone may figure out what's wrong.

kostly · 09-10-2016, 04:17 PM

configure: error: error verifying int64_t uses long long

I understand this is included in the g++ library (I think?), but why would it even want to build a 64 bit integer on a 32 bit machine?

Krejzi · 09-10-2016, 04:19 PM

That output isn't helpful at all (and has nothing to do with 64 bit architecture, you can have 64 bit type on 32 bit os just fine). Post the entire output.

Keith Hedger · 09-10-2016, 06:56 PM

because your host is 32bit does not mean your machine is 32 bit, if your machine is 64 bit you will need to use clfs to build 32bit

Krejzi · 09-10-2016, 07:41 PM

That makes even less sense. If you are on 32 bit host, you build 32 bit LFS. If you are on 64 bit host, you build a 64 bit LFS.

sr_ls_boy · 09-13-2016, 12:04 PM

I have never had a problem in building 32-bit LFS distros. One time in the past, I just downloaded an Ubuntu 32-bit live CD.
Now my 7.9 32-bit build was my host for building 32-bit 7.10. I found that approach much easier than CLFS. I would check
and see if your running a 64-bit kernel or not. Maybe 'setarch 32' would help. CLFS posts a uname hack. That is a kernel
module which reports a 32-bit kernel.

A good configure script can detect a 64-bit processor if it wants, no matter which precautions you make. See the comments
concerning the package GMP-6.1.0. I developed the habit of using the utility 'file' after a compile. This is verification if
the 32-bit build was good.

hendrickxm · 09-13-2016, 12:37 PM

I have always used a 32-bit live cd on 64-bit machines. The end result is a 32-bit LFS. If your host is 32-bit, the system you are building will be 32-bit.

anak_bawang · 09-13-2016, 07:20 PM

Quote:

Originally Posted by hendrickxm

I have always used a 32-bit live cd on 64-bit machines. The end result is a 32-bit LFS. If your host is 32-bit, the system you are building will be 32-bit.

Works for me too, with different condition. I build LFS on VMWare.

My machine 64 bit. My Windows OS 64 bit version.

Building LFS on VMWare
Using 32 bit Debian Live CD as a host -> result LFS 32 bit
Using 64 bit Debian Live CD as a hots -> result LFS 64 bit