[LIMA GUI] allow to build LIMA without the GUI about lima

[benlabbe]

rock

[kleag]

Does it take so much place and time ? The only dependency it has is Qt which is already a dependency of the remaining.
We could save a few megabytes and a few seconds of build but is it worth the effort ?

[benlabbe]

If we don't want to build with lima_gui, we can then build without the following packages:
- mesa-common-dev
- libgl1-mesa-dev
- libglu1-mesa-dev
- qml-module-qt-labs-folderlistmodel
- qml-module-qt-labs-settings
Don't forget their dependencies : xserver etc.
This is a huge gain when we need only lima as a library in another application or in a webservice

[kleag]

OK then. But let's make it not the default. I want that default builds/packages of lima are usable for the normal human being,
e.g. a linguist under Windows.

[benlabbe]

"let's make it not the default." yes, that's the way I implemented it.
See commit 2375d78

[benlabbe]

Dammit, it is effectively impossible to install Qt5 from apt without libxbc (the C binding to X). This means that nearly nothing can be saved when trying to avoid X-server installation in a docker container complied for Lima.

Hence, the only place saved is the binary executable test_gui / lima_gui if its compilation is disabled when building a standard no-gui web-service in a docker container.

[kleag]

If you really need to save space, you can build your own Qt and select the needed modules only.