Re: pdebuild-cross chroot tweaks for xapt

Neil Williams a écrit , Le 09/06/2012 20:52:
> On Sat, 09 Jun 2012 18:50:32 +0200
> Gilles Filippini <[email protected]> wrote:
> 
>> Until recently, I used to cross-build on my amd64 box a few packages for
>> my OpenMoko Freerunner phone (armel).
> 
> What versions?

The build host is an up to date wheezy amd64 box.
The target is an up to date sid armel phone.

> 
>> You'll find below my pdebuild-cross.rc and the multistrap configuration
>> files.
>>
>> If I set "arch=" (as it used to be) in the multistrap conf file, the
>> sources.list in the chroot are forced to amd64 and xapt don't know about
>> armel:
>>  deb [arch=amd64] http://ftp.fr.debian.org/debian unstable main
>>  deb-src http://ftp.fr.debian.org/debian unstable main
>>  deb [arch=amd64] http://www.emdebian.org/debian squeeze main
>>  deb-src http://www.emdebian.org/debian squeeze main
> 
> The chroot is a cross-building chroot, the architecture is the
> architecture of the programs which need to be executed not the ones you
> are targeting, so amd64 is correct as far as multistrap is concerned.
> It probably just means that the multistrap config needs to use the
> foreignarches option. It's too late to get this change into wheezy.
> 
> [Debian]
> packages=dpkg-dev binutils-multiarch build-essential dpkg-cross makedev
> source=http://ftp.fr.debian.org/debian
> keyring=debian-archive-keyring
> suite=unstable
> omitdebsrc=false
> 
> [Debian-armel]
> packages=
> architecture=armel
> source=http://ftp.fr.debian.org/debian
> keyring=debian-archive-keyring
> suite=unstable
> omitdebsrc=false
> 
> Debian-armel would then need to be added to aptsources.
> 
> But that's for later, you've already got the chroot, no point in
> regenerating it. It can be tweaked.

I tried it anyway and the [Debian-armel] bit didn't help: it produced a
sources.list with:
 deb [arch=amd64] http://ftp.fr.debian.org/debian unstable main

Something wrong with multistrap then?

> 
>> Then I tried "arch=armel" but then pdebuild-cross-create fail with:
>>  W: Failed to fetch
>> http://www.emdebian.org/debian/dists/squeeze/InRelease  Unable to find
>> expected entry 'main/binary-armel/Packages' in Release file (Wrong
> 
> There are no cross-building toolchains to install on armel.
> Cross-building for amd64 on armel is not recommended.
> 
>> # pdebuild-cross.rc
>> # -----------------------------------------------
>> CROSSARCH=armel
> 
> Correct.
> 
>> DEBBUILDOPTS="-aarmel"
>> MULTISTRAPFILE=/etc/multistrap/armel-sid.conf
> 
> This is an amd64 chroot which is configured to have a cross-building
> toolchain for armel.
> 
>> PBUILDERSATISFYDEPENDSOPT="-m -a armel"
> 
> ... and this is what determines the architecture of the -cross packages
> to be created as build dependencies.
> 
>> #arch=
>> arch=armel
> 
> Wrong.
> 
> arch=
> 
> or
> 
> arch=amd64
> 
>> packages=g++-4.4-arm-linux-gnueabi linux-libc-dev-armel-cross
> 
> i.e. a cross-compiler for installation on amd64.
> 
> sudo pbuilder login --configfile /etc/pdebuild-cross/pdebuild-cross.rc
> 
> Then remove that [arch=] section of the sources.list and check that
> xapt can work. 
> 
> Alternatively, duplicate *only* the line relating to the Debian
> unstable archive and specify the arch as armel for that one and *ONLY*
> that one. Check that xapt can work.
> 
> Once that is working, use:
> 
> sudo pbuilder login --configfile /etc/pdebuild-cross/pdebuild-cross.rc
> --save-after-login
> 
> Make the changes again but don't do any tests with xapt, this will make
> the sources.list changes permanent without polluting the chroot with
> temporary changes.
> 
> It's a completely standard pbuilder chroot, so the normal pbuilder
> commands work - it just has a cross-compiler pre-installed. Once
> changed, the chroot will continue operating just fine. The complication
> is that the cross-compiler is from stable.
> 
> (The pbuilder command above is output if pdebuild-cross-create is
> executed when the chroot tarball already exists.)

That did the trick!

Many thanks for your help,

_g.

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