Cross compiling issues.

dennybonka · 06-23-2022, 07:36 AM

Hello everyone!

I'm Dennis from Sweden.

I'm trying to add Swedish keylayout to Qtfrotz, A text adventure engine.
https://www.mobileread.com/forums/sh....php?p=2711142

Said and done. It works on my X11 desktop.
Then I tried the cross compiling...

I found the docker image for cross compiling:
https://github.com/pgaskin/NickelTC
And pulling it:

docker pull ghcr.io/pgaskin/nickeltc:1
Running:
docker run --rm -w /mnt -v "$(pwd):/mnt" -it 671eeb8d3594

and then run qmake,

and then make.

Seems to work. But I get a error when running it on the Kobo:

./QtFrotz
This application failed to start because it could not find or load the Qt platform plugin "xcb".

Reinstalling the application may fix this problem.
Aborted

Do you have any hints what this means? I guess this lib is not available on the kobo libra 2. Can I add some flag to exclude to depend on this lib?

Thanks for any hints.

Allt the best,

NiLuJe · 06-23-2022, 04:34 PM

You need a QPA to build a standard Qt application. The stock one is *not* usable as such.

The sanest choice right now is probably the one from UMR, but I have no idea how solid the Libra 2 support is.

TL;DR: Don't expect a plug'n play experience, you'll need a solid Qt5/embedded/x-compilation background in order not to run around in circles like a headless chicken.

dennybonka · 06-26-2022, 07:30 AM

Hello buddy! Thanks for the reply.

Yeah, I've been working as a embedded Linux guy for a while, so I'm not new to the concept, but I have not worked with QT before.

I will check it out, thanks!

sherman · 06-26-2022, 06:20 PM

Out of interest, I tried seeing what I could do with the Kobo QPA this weekend. Answer: not a lot...

Couple of problems, first, it seems the QPA doesn't automatically load the fonts, so by default you get lots of squares instead of characters. Looking at what libnickel does, this might not be too difficult to resolve.

The bigger issue (and always has been) is the way touch is (not) handled. Touch is handled via a separate plugin (libkevdevtouch.so), and while it should be setup in the QPA, it's not. It appears that libnickel is in charge of setting it up as well.

06-23-2022, 07:36 AM	#1
dennybonka Junior Member Posts: 2 Karma: 10 Join Date: Jun 2022 Device: Kobo Libra 2	Cross compiling issues. Hello everyone! I'm Dennis from Sweden. I'm trying to add Swedish keylayout to Qtfrotz, A text adventure engine. https://www.mobileread.com/forums/sh....php?p=2711142 Said and done. It works on my X11 desktop. Then I tried the cross compiling... I found the docker image for cross compiling: https://github.com/pgaskin/NickelTC And pulling it: docker pull ghcr.io/pgaskin/nickeltc:1 Running: docker run --rm -w /mnt -v "$(pwd):/mnt" -it 671eeb8d3594 and then run qmake, and then make. Seems to work. But I get a error when running it on the Kobo: ./QtFrotz This application failed to start because it could not find or load the Qt platform plugin "xcb". Reinstalling the application may fix this problem. Aborted Do you have any hints what this means? I guess this lib is not available on the kobo libra 2. Can I add some flag to exclude to depend on this lib? Thanks for any hints. Allt the best,

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06-23-2022, 04:34 PM	#2
NiLuJe BLAM! Posts: 13,477 Karma: 26012492 Join Date: Jun 2010 Location: Paris, France Device: Kindle 2i, 3g, 4, 5w, PW, PW2, PW5; Kobo H2O, Forma, Elipsa, Sage, C2E	You need a QPA to build a standard Qt application. The stock one is not usable as such. The sanest choice right now is probably the one from UMR, but I have no idea how solid the Libra 2 support is. TL;DR: Don't expect a plug'n play experience, you'll need a solid Qt5/embedded/x-compilation background in order not to run around in circles like a headless chicken.

06-26-2022, 07:30 AM	#3
dennybonka Junior Member Posts: 2 Karma: 10 Join Date: Jun 2022 Device: Kobo Libra 2	Hello buddy! Thanks for the reply. Yeah, I've been working as a embedded Linux guy for a while, so I'm not new to the concept, but I have not worked with QT before. I will check it out, thanks!

06-26-2022, 06:20 PM	#4
sherman Guru Posts: 850 Karma: 2641698 Join Date: Aug 2008 Location: Taranaki - NZ Device: Kobo Aura H2O, Kobo Forma	Out of interest, I tried seeing what I could do with the Kobo QPA this weekend. Answer: not a lot... Couple of problems, first, it seems the QPA doesn't automatically load the fonts, so by default you get lots of squares instead of characters. Looking at what libnickel does, this might not be too difficult to resolve. The bigger issue (and always has been) is the way touch is (not) handled. Touch is handled via a separate plugin (libkevdevtouch.so), and while it should be setup in the QPA, it's not. It appears that libnickel is in charge of setting it up as well.