How to build Qt on system without a GUI?

SGaist · wrote on 5 Jul 2019, 21:53

They are generated when configure is run. Look into your build folder.

Pavel_47 · wrote on 23 Oct 2019, 14:19

Hello,
I've tried all suggestions found on this topic, but build process still fails: cannot find xkbccommon-compose.h file. Just one remark: trying to install additional packages with the command:
sudo apt-get install libxcb1 libxcb-util0 libpam-dev ...
I should remove just libxbc-util0 (all others were kept) because this package wasn't found.
Any ideas ?
Thanks.

SGaist · wrote on 23 Oct 2019, 18:07

Hi,

What version of xkbcommon do you have installed ?

Pavel_47 · 24 Oct 2019, 09:01

@closx said in How to build Qt on system without a GUI?:
I'm not aware what is actually installed ... I've just executed the following instruction, as was suggested previously in this topic (except libxcb-util0 which wasn't found)

sudo apt-get install libxcb1 libxcb-util0 libpam-dev libcairo-dev libxcb-xinerama0 libev-dev libx11-dev libx11-xcb-dev libxkbcommon0 libxkbcommon-x11-dev libxkbcommon-dev libxcb-dpms0-dev libxcb-xinerama0-dev libxkbfile-dev libxcb-util0-dev libxcb-image0-dev

jsulm · wrote on 24 Oct 2019, 09:01

@Pavel_47 Did you install these packages on your target device? Since you're crosscompiling you need them in your sysroot, not on your host machine.

Pavel_47 · wrote on 24 Oct 2019, 09:15

I've contacted libxkbcommon developers. They suggested me using this command:
sudo apt-get install libxkbcommon-dev libxkbcommon-x11-dev
That is what i did, but system informed me that libxkbcommon-dev and libxkbcommon-x11-dev are already the newest versions (i.e. 0.8.2-1~ubuntu 18.04.1).

Well, I'm trying to rebiuild Qt toolchain once more . Now it's running ...

Pavel_47 · wrote on 24 Oct 2019, 09:26

Sorry, I've missed your last suggestion - install libxkbcommon on target (i.e RPi3 in my case). But anyway, how build process on the host can be influenced by what is installed (or not) on that target device ?

Pavel_47 · wrote on 24 Oct 2019, 09:42

The new attempt of Qt building is also failed.
I wonder if anyone has managed to bulid Qt on Ubuntu ?
What should I check ... or install to resolve the problem ?

SGaist · wrote on 24 Oct 2019, 10:51

Since you are cross-compiling, you need all dependencies for your target. This is usually done installing the libraries on said target and then sync the content of the file system of the target back to the host so the cross-compiler can use them to do its work.

Pavel_47 · 25 Oct 2019, 13:28

I've just checked libxkbcommon-dev and libxkbcommon-x11-dev on RPi. As on Ubuntu they are installed and are newest versions.

SGaist · wrote on 24 Oct 2019, 11:11

Did you sync your RPi filesystem back to your host before trying to build Qt ?

Pavel_47 · 24 Oct 2019, 11:34

Yes, at very first time I executed these commands (as it's suggested here https://wiki.qt.io/RaspberryPi2EGLFS):
rsync -avz pi@raspberrypi.local:/lib sysroot
rsync -avz pi@raspberrypi.local:/usr/include sysroot/usr
rsync -avz pi@raspberrypi.local:/usr/lib sysroot/usr
rsync -avz pi@raspberrypi.local:/opt/vc sysroot/opt

Then I did 3 or 4 other attempts to build, but at each of these attempts I didn't proceed with resync with RPi.
Anyway one thing escapes me .... should I keep connection with RPi while running toolchain build on host ?

jsulm · wrote on 24 Oct 2019, 11:34

@Pavel_47 said in How to build Qt on system without a GUI?:

should I keep connection with RPi while running toolchain build on host ?

No, you just need to sync your sysroot.

Pavel_47 · 24 Oct 2019, 12:13

I've checked the location of xkbcommon-compose.h. It's Ok:

Then I've tried to compile this:

#include <xkbcommon/xkbcommon-compose.h>
int main() {}

It was also Ok

jsulm · wrote on 24 Oct 2019, 12:13

@Pavel_47 Is it in your host system or sysroot?

Pavel_47 · 24 Oct 2019, 12:23

@jsulm said in How to build Qt on system without a GUI?:

@Pavel_47 Is it in your host system or sysroot?

Sorry, I didn't understand what you mean ...
The location of the screenshot: /usr/include/xkbcommon on my host
The location of .c snippet (where I compiled it): ~/raspi/ on my host

jsulm · wrote on 24 Oct 2019, 12:23

@Pavel_47 said in How to build Qt on system without a GUI?:

/usr/include/xkbcommon on my host

That's the point: you need these headers in your sysroot!

Pavel_47 · wrote on 24 Oct 2019, 12:36

Indeed !
In ~/raspi/sysroot/usr/include/xkbcommon there is one less file comparing to /usr/include/xkbcommon ... and this missed file is precisely xkbcommon-compose.h.

So, I copy xkbcommon-compose.h from /usr/include/xkbcommon to ~/raspi/sysroot/usr/include/xkbcommon and then build Qt toolchain once more ?

Pavel_47 · wrote on 24 Oct 2019, 14:03

I copied xkbcommon-compose.h from /usr/include/xkbcommon to ~/raspi/sysroot/usr/include/xkbcommon and then run make once more.
And it failed one more time.
Here is how it finished:

Any other suggestions ?

Thanks.

SGaist · wrote on 24 Oct 2019, 14:20

As we already wrote: you need the library too. And built for your target.