Building arm on aarch64

[Tristan Van Berkom]

On Wed, 2017-03-29 at 21:19 +0200, Aleix Pol wrote:
> On Wed, Mar 29, 2017 at 9:14 PM, Alexander Larsson <alexl at redhat.com>
> wrote:
> > 
> > On Wed, 2017-03-29 at 20:12 +0200, Aleix Pol wrote:
> > > 
> > > Hi,
> > > As you can see, my endeavour isn't over just yet.
> > > 
> > > Gnome kindly gave me access to an aarch64 system (much
> > > appreciated!)
> > > where I've been trying to get the build sorted.
> > > 
> > > I'm using flatpak-build-tools to get things working on that
> > > system.
> > > aarch64 seems to work just fine, arm builds don't seem to prosper
> > > that
> > > well.
> > > 
> > > This is the build.conf I'm using nowadays:
> > > https://paste.kde.org/piy2zsqpp/9kkvy0/raw
> > > 
> > > flatpak-builder is being called like this:
> > > flatpak-builder --arch=arm --force-clean --require-changes --
> > > ccache
> > > --repo=/srv/gnome_aarch64/flatpak-build-scripts/work/export/repo
> > > --subject="build of org.kde.Sdk, `date`"  sdk org.kde.Sdk.json
> > > 
> > > That's the error I'm getting:
> > > HEAD is now at a55f362... Fix the JPEG EXIF reader to deal with
> > > some
> > > broken/corrupt files
> > > execvp ./configure: Exec format error
> > > Error: module qt5-qtbase: Child process exited with code 1
> > > make: *** [all] Error 1
> > 
> > This looks like its trying to run an unsupported elf format bash
> > (or
> > whatever shell the configure file references). That is weird
> > though, I
> > thought aarch64 machines always could run arm executables?
> Thought so too.
> 
> > 
> > Does running an arm binary work outside of flatpak?
> I don't know, do you have one at hand? I'm not sure how it would work
> myself.

You should be able to test this with flatpak itself.

Try using the regular steps to install the runtimes and some app from
gnome-apps-nightly, using the "--arch=arm" arg to flatpak install/run
etc to make sure you've installed the arm bundles.

Or, if you recall the correct voodoo incantations for entering the
runtime with a shell (I think can be done with flatpak build-init or
such), then you can avoid downloading too much stuff, just try
installing the arm runtime on your aarch64 machine, shell into it and
run something.

Sorry I still dont really have a clue what is going on, I also doubt
this is the issue as Aarch64 is supposed to support 32bit execution
mode (Aarch32) which in turn should support the armv7a tuning we use to
build the runtime.

Cheers,
    -Tristan

> > 
> > Also, is this the first module in the json, or did anything work
> > before
> > it failed?
> Yes, first one.
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