Unknown module(s) in QT: quickcontrols2

[DarkPatate]

@SGaist
It's compiling!
I just got a makefile error :

/usr/bin/ld: cannot find -lGLESv2
collect2: error: ld returned 1 exit status
Makefile:143: recipe for target 'appliUR' failed

[SGaist]

Did you install libgles2-mesa-dev ?

[DarkPatate]

@SGaist
Yes, I got the following result:

pi@raspberrypi:~/Documents/urecran/appliUR $ sudo apt-get install libgles2-mesa-dev
Reading package lists... Done
Building dependency tree       
Reading state information... Done
libgles2-mesa-dev is already the newest version (13.0.6-1+rpi2).
The following packages were automatically installed and are no longer required:
  lxkeymap python-cairo python-gobject python-gobject-2 python-gtk2 python-xklavier
Use 'sudo apt autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

(sorry I have to wait 600 seconds to post a new message)

[SGaist]

What distribution are you using ?

[DarkPatate]

@SGaist As I said, I use Raspbian :

PRETTY_NAME="Raspbian GNU/Linux 9 (stretch)"
NAME="Raspbian GNU/Linux"
VERSION_ID="9"
VERSION="9 (stretch)"
ID=raspbian
ID_LIKE=debian
HOME_URL="http://www.raspbian.org/"
SUPPORT_URL="http://www.raspbian.org/RaspbianForums"
BUG_REPORT_URL="http://www.raspbian.org/RaspbianBugs"

At less you want more informations?

[SGaist]

Did you check whether you have this library somewhere on your OS ?

[DarkPatate]

@SGaist I tried this function:

ldconfig -p | grep libgles2-mesa-dev

I have no output, so I suppose the lib is not installed? So why apt-get told me it is already installed?

[SGaist]

You are mixing the name of the package and the name of the library. Use grep -i gles.

[DarkPatate]

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

grep -i gles

I got this result:

pi@raspberrypi:/ $ ldconfig -p | grep -i gles
	libbrcmGLESv2.so (libc6,hard-float) => /opt/vc/lib/libbrcmGLESv2.so
	libGLESv1_CM.so.1 (libc6,hard-float) => /usr/lib/arm-linux-gnueabihf/libGLESv1_CM.so.1

Both folder don't exist.

[SGaist]

IIRC, the quick workaround would to create a symbolic link named libGLESv2.so to your libbrcmGLESv2.so

[DarkPatate]

@SGaist
I never did that before.
So I tried that :

sudo ln -s /opt/vc/lib/libbrcmGLESv2.so /opt/vc/lib/libGLESv2.so

But now the compilation failed:

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   -lQt5QuickControls2 -lQt5Quick -lQt5Gui -lQt5Qml -lQt5Network -lQt5Core -lGLESv2 -lpthread 
/usr/bin/ld: cannot find -lGLESv2
collect2: error: ld returned 1 exit status
Makefile:143: recipe for target 'appliUR' failed
make: *** [appliUR] Error 1

It was the right command?

[SGaist]

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]

@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]

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]

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

[DarkPatate]

@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]

Modify LD_LIBRARY_PATH so that it also point to that folder.

[sierdzio]

@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]

@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]

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...).