Thank you both!

It seems to have worked.

However I got a new error.... (but later in the script)... And then I fixed that one too...

Seems the dh-translations was still missing... but now I have fixed it....

And managed to compile it!

I'm trying to find a good way to solve qtmir tests. For the test to work they need a lot of mocks that are based on internal mir stuff. And since they are used directly into mir it is not possible to build wrappers.

Include file	Object	test file	Defined in
mir/main_loop.h	mir::MainLoop	tests/framework/mock_main_loop.h	src/include/server/mir/main_loop.h
mir/scene/prompt_session.h	mir::scene::PromptSession	tests/framework/mock_prompt_session.h	src/include/server/mir/scene/prompt_session.h
mir/scene/surface.h>	mir::scene::Surface	tests/framework/mock_surface.h	src/include/server/mir/scene/surface.h
mir/shell/persistent_surface_store.h	mir::shell::PersistentSurfaceStore	tests/framework/mock_persistent_surface_store.h	src/include/server/mir/shell/persistent_surface_store.h
mir/scene/session.h	mir::scene::Session	tests/framework/mock_mir_session.h	src/include/server/mir/scene/session.h

So the best solution (or least bad) that I have come up with is...
to move all those mocks to miroil and make them accessible through a MockFactory... Something like:

class MockFactory
{
    auto get_mock_surface()                  -> std::shared_ptr<mir::scene::Surface>;
    auto get_mock_main_loop()                -> std::shared_ptr<mir::MainLoop>;
    auto get_mock_prompt_session()           -> std::shared_ptr<mir::scene::PromptSession>;
    auto get_mock_persistent_surface_store() -> std::shared_ptr<mir::shell::PersistentSurfaceStore>;
    auto get_mock_session()                  -> std::shared_ptr<mir::scene::Session>;    
    
    std::shared_ptr<mir::scene::Surface>                   surfaces;
    std::shared_ptr<mir::MainLoop>                         main_loops;
    std::shared_ptr<mir::scene::PromptSession>             prompt_sessions;
    std::shared_ptr<mir::shell::PersistentSurfaceStore>    persistent_surface_stores;
    std::shared_ptr<mir::scene::Session>                   sessions;       
};

The problem is that qtmir does not know the destructor of this objects, to they will have to be deleted inside miroil.
Therefore I have added a reference in MockFactor to the objects. Which are deleted by MockFactory. This will only work if MockFactory is the last object to be deleted, so we have to make sure it is.

So do you guys see any better solutions than this?

Hi!

I'm trying to get the crossbuilder working on the example in the documentation. But I'm stuck on an some thing to do with mk-build-deps??

So I'm using qemu/kvm running Ubuntu 18.04.3.... fresh install...

 crossbuilder setup-lxd
 cd ~/src/git/address-book-app

Then

  bash -x crossbuilder

a lot of output... but the last command is:

+ lxc exec address-book-app-usdk-16-04-amd64-armhf-dev -- sh -c 'mk-build-deps                 -t '\''apt-get -o Debug::pkgProblemResolver=yes --no-install-recommends -y'\''                 -i --host-arch armhf                 /home/demo/patched_debian_control'
dpkg-architecture: warning: specified GNU system type arm-linux-gnueabihf does not match CC system type x86_64-linux-gnu, try setting a correct CC environment variable
dh_testdir
dh_testroot
dh_prep
dh_testdir
dh_testroot
dh_install
dh_installdocs
dh_installchangelogs
dh_compress
dh_fixperms
dh_installdeb
dh_gencontrol
dpkg-gencontrol: warning: File::FcntlLock not available; using flock which is not NFS-safe
dh_gencontrol debug symbol wrapper: all non-arch-all packages for this build platform armhf: address-book-app-cross-build-deps 
dh_gencontrol debug symbol wrapper: packages to act on: address-book-app-cross-build-deps 
dh_gencontrol debug symbol wrapper: ignored packages: 
dh_gencontrol debug symbol wrapper: no debian/address-book-app-cross-build-deps-dbgsym, skipping package address-book-app-cross-build-deps
dh_md5sums
dh_builddeb
dpkg-deb: building package 'address-book-app-cross-build-deps' in '../address-book-app-cross-build-deps_1.0_armhf.deb'.

The package has been created.
Attention, the package has been created in the current directory,
not in ".." as indicated by the message above!
Selecting previously unselected package address-book-app-cross-build-deps:armhf.
(Reading database ... 53932 files and directories currently installed.)
Preparing to unpack address-book-app-cross-build-deps_1.0_armhf.deb ...
Unpacking address-book-app-cross-build-deps:armhf (1.0) ...
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Correcting dependencies...Starting pkgProblemResolver with broken count: 1
Starting 2 pkgProblemResolver with broken count: 1
Investigating (0) address-book-app-cross-build-deps [ armhf ] < 1.0 > ( devel )
Broken address-book-app-cross-build-deps:armhf Depends on dh-translations [ armhf ] < none ->  > ( none )
  Removing address-book-app-cross-build-deps:armhf because I can't find dh-translations:armhf
Done
 Done
Starting pkgProblemResolver with broken count: 0
Starting 2 pkgProblemResolver with broken count: 0
Done
The following additional packages will be installed:
  libgl1-mesa-dev:armhf libgl1-mesa-glx:armhf mesa-common-dev:armhf
The following packages will be REMOVED:
  address-book-app-cross-build-deps:armhf
The following NEW packages will be installed:
  libgl1-mesa-dev:armhf libgl1-mesa-glx:armhf mesa-common-dev:armhf
0 upgraded, 3 newly installed, 1 to remove and 16 not upgraded.
1 not fully installed or removed.
Need to get 666 kB of archives.
After this operation, 4218 kB of additional disk space will be used.
Get:1 http://ports.ubuntu.com/ubuntu-ports xenial-updates/main armhf libgl1-mesa-glx armhf 18.0.5-0ubuntu0~16.04.1 [118 kB]
Get:2 http://ports.ubuntu.com/ubuntu-ports xenial-updates/main armhf mesa-common-dev armhf 18.0.5-0ubuntu0~16.04.1 [543 kB]
Get:3 http://ports.ubuntu.com/ubuntu-ports xenial-updates/main armhf libgl1-mesa-dev armhf 18.0.5-0ubuntu0~16.04.1 [4466 B]
Fetched 666 kB in 2s (332 kB/s)               
(Reading database ... 53936 files and directories currently installed.)
Removing address-book-app-cross-build-deps:armhf (1.0) ...
Selecting previously unselected package libgl1-mesa-glx:armhf.
(Reading database ... 53932 files and directories currently installed.)
Preparing to unpack .../libgl1-mesa-glx_18.0.5-0ubuntu0~16.04.1_armhf.deb ...
Unpacking libgl1-mesa-glx:armhf (18.0.5-0ubuntu0~16.04.1) ...
Selecting previously unselected package mesa-common-dev:armhf.
Preparing to unpack .../mesa-common-dev_18.0.5-0ubuntu0~16.04.1_armhf.deb ...
Unpacking mesa-common-dev:armhf (18.0.5-0ubuntu0~16.04.1) ...
Selecting previously unselected package libgl1-mesa-dev:armhf.
Preparing to unpack .../libgl1-mesa-dev_18.0.5-0ubuntu0~16.04.1_armhf.deb ...
Unpacking libgl1-mesa-dev:armhf (18.0.5-0ubuntu0~16.04.1) ...
Processing triggers for libc-bin (2.23-0ubuntu11) ...
Setting up libgl1-mesa-glx:armhf (18.0.5-0ubuntu0~16.04.1) ...
update-alternatives: using /usr/lib/arm-linux-gnueabihf/mesa/ld.so.conf to provide /etc/ld.so.conf.d/arm-linux-gnueabihf_GL.conf (arm-linux-gnueabihf_gl_conf) in auto mode
Setting up mesa-common-dev:armhf (18.0.5-0ubuntu0~16.04.1) ...
Setting up libgl1-mesa-dev:armhf (18.0.5-0ubuntu0~16.04.1) ...
Processing triggers for libc-bin (2.23-0ubuntu11) ...
mk-build-deps: Unable to install address-book-app-cross-build-deps at /usr/bin/mk-build-deps line 402.
mk-build-deps: Unable to install all build-dep packages
+ rm -r /tmp/crossbuilder.caWdHt

any ideas?