Re: [Xen-devel] I was able to cross-compile the hypervisor on an amd64 host for the aarch64 target ... However, I can't build the Xen toolset

[Julien Grall <julien.grall@xxxxxxx>]

Hello Nick,

Can you please configure your e-mail client to quote properly? This is 
quite difficult to follow the conversation.
On 07/06/2017 11:56 PM, Nick Garnett wrote:
> Sent: Thursday, July 06, 2017 13:48
> Sent: Thursday, July 06, 2017 12:26
>
> > From: Julien Grall [mailto:julien.grall@xxxxxxx]
> > Sent: Tuesday, July 04, 2017 09:47
> >
> > On 07/04/2017 05:42 PM, Nick Garnett wrote:
> > > I tried installing the tools with an ARM64 chroot also and had a
> > > similar issue.  In that case, the package "crossbuild_essential_arm64" wouldn't 
> > > install because it depended on a package that was not installable.
> > I don't use crossbuild within the chroot. My chroot contains ARM64 binaries 
> > only and QEMU is used to run ARM64 binaries.
> In that case, you don't need to install crossbuild_essential_arm64.
> Compiling in that chroot is like compiling directly on an ARM platforms.
>
> My runes are usually:
>
> ./configure
> make -j install-tools
>
> This will install the tools in /usr/local/
>
> I think the list of dependencies on the CrossCompiling page is still valid:
>
> https://wiki.xenproject.org/wiki/Xen_ARM_with_Virtualization_Extensions/CrossCompiling#Configuring_an_arm64_crossbuild_chroot
>
> ____________________________________________________________________________________
> [nickgarnett:170706-1225PDT]
> Julian, you state:
>         In that case, you don't need to install crossbuild_essential_arm64.
>         Compiling in that chroot is like compiling directly on an ARM platform.
>
> I assume you mean if I use crossbuild it would be "like compiling directly on an ARM 
> platform".  Correct?
No, crossbuild would be building from an x86 host and target an ARM 
platform. Compiling directly on an ARM platform would be native build or 
use QEMU user-mode.
> What should I do (or not do), following the HOWTO in 
> "https://wiki.xenproject.org/wiki/Xen_ARM_with_Virtualization_Extensions/CrossCompiling";?
>         Should I use "multiarch"?
>
> ____________________________________________________________________________________
> [nickgarnett:170706-1345PDT]
> Following the HOWTO 
> "https://wiki.xenproject.org/wiki/Xen_ARM_with_Virtualization_Extensions/CrossCompiling";, 
> resulted in the following error in the "apt-get update" step:
>
>         #created the chroot and fixed the chroot.d descriptor file
>
>         (zesty-arm64-cross)root# apt-get install vim-tiny wget sudo less 
> pkgbinarymangler
>
>         #(zesty-arm64-cross)root# vi /etc/apt/sources.list
>         # added ...
>         #deb [arch=arm64] http://ports.ubuntu.com/ saucy main universe
>
>         #Since this is a cross-build chroot Recommended and Suggested packages 
> are largely unnecessary,
>         # created /etc/apt/apt.conf.d/30norecommends containing:
>         #APT::Install-Recommends "0";
>         #APT::Install-Suggests "0";
>
>         (zesty-arm64-cross)root# dpkg --add-architecture arm64
>         (zesty-arm64-cross)root# apt-get update
>
>         Resulted in:
>         Err:3 http://archive.ubuntu.com/ubuntu zesty/main arm64 Packages
>           404  Not Found [IP: 91.189.88.149 80]
>         Ign:5 http://archive.ubuntu.com/ubuntu zesty/universe arm64 Packages
>         Reading package lists... Done
>         E: Failed to fetch 
> http://archive.ubuntu.com/ubuntu/dists/zesty/main/binary-arm64/Packages
>                  404  Not Found [IP: 91.189.88.149 80]
>         E: Some index files failed to download. They have been ignored, or old 
> ones used instead.
I am assuming you were able to fix this give the configure below?

> ____________________________________________________________________________________
> [nickgarnett:170706-1555PDT]
>
> Got "configure: error: ./configure: line 6930: /usr/bin/python: cannot execute
> binary file: Exec format error is too old, minimum required version is 2.3"
>          ./configure --host=aarch64-linux-gnu
>         checking build system type... x86_64-unknown-linux-gn
I am a bit confused, on a previous mail you mentioned you were using 
QEMU user-mode. But this looks like you are doing cross-build. Maybe I 
am lost because of the quoting. The error "exec format error" below seem 
to confirm you are mixing both.
If you have a rootfs with only arm64 binaries, you could use qemu 
user-mode. As soon as you call chroot in you rootfs your environment 
will be like running on an ARM64 platform. You should never see the word 
x86_64 anymore.
For crossbuild, I haven't done in a while and would need to brush up a 
bit before giving any help here. A good start would be:
https://wiki.debian.org/CrossCompiling

Let me know which way you want to use.

Cheers,

--
Julien Grall

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