only one QPushButton with QWidget works

[SGaist]

Are you running this application on a remote device ?

If so, you should rather make it run first on your desktop machine and then run on the device.

[K-Str]

@SGaist
I added the Kit for Desktop Qt 5.12.3 GCC 64 Bit-
It doesn't work. This is the error:

17:06:03: Running steps for project Teleskop...
17:06:03: Configuration unchanged, skipping qmake step.
17:06:03: Starting: "/usr/bin/make" -j4
g++ -Wl,-rpath,/home/kurt/Qt/5.12.3/gcc_64/lib -o Teleskop main.o mainwindow.o moc_mainwindow.o   -L/home/kurt/Qt/5.12.3/gcc_64/lib -lQt5Widgets -lQt5Gui -lQt5Core -lGL -lpthread   
/usr/bin/ld: cannot find -lGL
Makefile:263: recipe for target 'Teleskop' failed
collect2: error: ld returned 1 exit status
make: *** [Teleskop] Error 1
17:06:03: The process "/usr/bin/make" exited with code 2.
Error while building/deploying project Teleskop (kit: Desktop Qt 5.12.3 GCC 64bit)
When executing step "Make"
17:06:03: Elapsed time: 00:00.

I think I have to add the module GL. Is this correct? But where can I find this?

[SGaist]

The missing GL error has been asked about many times already, you have to install the OpenGL development package from your distribution.

[K-Str]

@SGaist ,
thanks for this hint I will add the kit for Ubuntu again tomorrow.

[K-Str]

@SGaist
Yes I try to run it remotely on a raspberry.
Now I have installed the kit for the host PC. Yes it works perfect on the host.
What can I do to make it working on a remote raspberry? I use /usr/bin/gdb-multiarch for debugging remotely on the raspberry. Is this ok

[SGaist]

Do you mean that your application is working fine on your desktop and still not on your target ?

[K-Str]

@SGaist yes
if the target is the linux host (ubuntu desktop) the application works fine.
If the target is the raspberry it does not work.
What about this info:

Could not load shared library symbols for 3 libraries, e.g. /usr/local/qt5pi/lib/libQt5Widgets.so.5.

Is there something missing?
Maybe somebody knows more about this problem.

[SGaist]

What do you get if you call ldd on that file ?

[K-Str]

@SGaist , where must I run ldd?
On the linux host PC or on the raspberry?

[K-Str]

@SGaist ;
I will check it tomorrow

[SGaist]

@k-str said in only one QPushButton with QWidget works:

Sorry, I made a mistake

What do you mean with that ?

[K-Str]

@SGaist ,
yesterday I had some trouble with my computer network and I couldn't write a post correcttly.
Here the output of lcc:

Do yoe need the output also when I run lcc on the on the Linux host?

[SGaist]

Looks good. What is the exact error message you're getting when starting your application ?

[K-Str]

@SGaist ,
there are no errors when I run the application. Only warnings during startup as I wrote eight days ago.
Now I install everything new because I have some big troubles with the network running a virtual machine (=Hyper-V). I install it now on oracles virtual box.
I will see what happens after this.
It's crazy!!
Now I have an other problem after a new installation:
It seems to be a configuration failure:
When I start the application I get a problem.
What means this? does it miss an egl module?

Process /opt/TestWidget/bin/TestWidget created; pid = 2877
qt.qpa.egldeviceintegration: Failed to load EGL device integration "eglfs_brcm"
EGL library doesn't support Emulator extensions

and a window appears

I find no real help in the internet.
I use a MPI3508 LCD HDMI display on my raspberry3.
Maybe my current configuration cannot handle it.
Please has somebody an answer?

[SGaist]

Do you mean that you have that error in a virtual machine ?

[K-Str]

@SGaist ,
no I think something went wrong during the installation.
What mmeans this:
Failed to load EGL device integration "eglfs_brcm"

[SGaist]

It's getting a bit fuzzy here. You seem to have issues both with your desktop machine and RaspberryPi.

Can you do a small summary of what is going on and where exactly ?

[K-Str]

@SGaist , hello to all;
I'm sorry for the delay, but I made some investigation.
It seems to have just a little problem:
When I start the application local on the terminal then I first have to write

export  DISPLAY:=0

Then it works with a warning

libEGL warning: DRI2: failed to authenticate

Is there a way to add this command

export DISPLAY=:0

automaticially before I run the application?

[jsulm]

@k-str You can write a simple shell script which first sets the env variable and then calls your app and then use this script to start the app.

[K-Str]

@jsulm ,
thanks for your answer!
Yes I know there was somthing like this but I have no Idea how such a script looks.
Where can I find an example? It should wor also for debugging