Unknown module(s) in QT: quickcontrols2

SGaist · 5 May 2018, 22:25

Because the linker won't search for libraries in /opt/vc/lib/. Add it to your .pro file with a line like LIBS += -L/opt/vc/lib/

DarkPatate · S SGaist 5 May 2018, 22:14

@SGaist
Visibly another component need the lib and doesn't find the symbolic link. Sorry to be so nooby.

pi@raspberrypi:~/Documents/urecran/appliUR $ make
g++ -Wl,-O1 -Wl,-rpath-link,/usr/lib/arm-linux-gnueabihf -o appliUR main.o strategiesmodel.o communication.o qrc_qml.o moc_strategiesmodel.o moc_communication.o   -L/opt/vc/lib/ -lQt5QuickControls2 -lQt5Quick -lQt5Gui -lQt5Qml -lQt5Network -lQt5Core -lGLESv2 -lpthread 
/usr/bin/ld: warning: libGLESv2.so.2, needed by /usr/lib/gcc/arm-linux-gnueabihf/6/../../../arm-linux-gnueabihf/libQt5Quick.so, not found (try using -rpath or -rpath-link)

DarkPatate · wrote on 6 May 2018, 08:24

I am stupid, it's just a warning. The application compiled.
I just have a problem when I want to execute the program. The symbolic link doesn't work:

./appliUR: error while loading shared libraries: libGLESv2.so: cannot open shared object file: No such file or directory

sierdzio · 6 May 2018, 09:07

You need to enable the vc4 gpu driver in raspi-config. I think it is listed under experimental section.

DarkPatate · 7 May 2018, 04:55

@sierdzio
I was in :

7 Advanced options > A7 GL Driver > G1 GL (Full KMS)

(I din't find reference to VC4 GPU Driver in my raspi-config)

I don't now if it's that? But it didn't work, even after reboot.

SGaist · wrote on 6 May 2018, 21:56

Modify LD_LIBRARY_PATH so that it also point to that folder.

sierdzio · wrote on 7 May 2018, 04:55

@DarkPatate said in Unknown module(s) in QT: quickcontrols2:

I don't now if it's that? But it didn't work, even after reboot.

Looks like it. Shame it didn't work. Try the other options maybe, but they are less likely to work.

DarkPatate · wrote on 7 May 2018, 11:53

@SGaist now all the librairy are found. But there is a missing plugin:

pi@raspberrypi:~/Documents/appliUR $ ./appliUR 
This application failed to start because it could not find or load the Qt platform plugin "eglfs"
in "".

Available platform plugins are: eglfs, linuxfb, minimal, minimalegl, offscreen, xcb.

Reinstalling the application may fix this problem.
Aborted

So I tried to create a sym link to the EGL lib too:

sudo ln -s /opt/vc/lib/libbrcmEGL.so /opt/vc/lib/libEGL.so

But it didn't work. It's almost working!

@sierdzio I tried all options, without success.

sierdzio · 5 Jul 2018, 12:00

Eglfs platform plugin is a Qt plugin, located in <qt dir>/plugins/platforms.

Most probably your Qt was compiled for XCB (X11) only. Try running your app with -platform xcb argument (but expect low performance from this plugin...).

DarkPatate · wrote on 7 May 2018, 15:00

@sierdzio said in Unknown module(s) in QT: quickcontrols2:

-platform xcb

I got the same pb with xcb. I tried also linuxfb and minimal, without success :/

sierdzio · 19 May 2018, 21:06

I see. Well, that answer won't make you happy, perhaps, but: try following the "RPI eglfs" (Google it) guide and cross compile Qt yourself.

If definitely works, I've used Qt, with Qt Quick, many times. There are issues with the drivers, sure. But in general it works.

DarkPatate · wrote on 19 May 2018, 21:06

@sierdzio sorry for the very late reply, I was so busy. I tried this solution long time ago but I failed. I will try again and let you know :)

sierdzio · wrote on 20 May 2018, 06:51

Here's the link by the way https://wiki.qt.io/RaspberryPi2EGLFS

I recommend getting the source tarball instead of using git: https://download.qt.io/archive/qt/5.10/5.10.1/single/ Less to download, no need to run init-repository - in general less hassle (unless you want to contribute to Qt, but that's not the case here).