[Paweł]

Hello, in my application i have used QR code scanner, using QZXing library (https://github.com/ftylitak/qzxing ). I embed the source code in my project adding 

include(QZXing/QZXing.pri)

to my .pro file. When compile for Android platform everything works fine, but when i switch to Felgo desktop i get linker error, that I paste below:

/usr/bin/ld: /home/user/Felgo/Felgo/gcc_64/lib/libFelgo.a(spinemeshrenderer.o): undefined reference to symbol ‘glEnable’

/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/9/../../../x86_64-linux-gnu/libGL.so: error adding symbols: DSO missing from command line

In .pro file I have:

QT += svg widgets positioning location multimedia

CONFIG += qzxing_multimedia

CONFIG += felgo

CONFIG += c++14

And in section linux!:android I have:

linux:!android  {

    LIBS += -lGL -lssl -lcrypto

}

Thanks for your help.

[AlexFelgo Team]

Hi,

You might miss some more OpenGL dependencies, can you try to modify your LIBS line to:

LIBS += -lGL -lGLU -lGLEW -lglut -lssl -lcrypto

Best,
Alex from Felgo

[Paweł]

I added dependencies to GLEW and freeglut, previusly installed with apt but still get the same linker error. Before I added QZXing to project everything works fine on Desktop but now I can only run application on Android.

[AlexFelgo Team]

Hi,

We just tested the project on Ubuntu 18.04 and it compiles & runs fine. Which Linux distro are you using?

Thanks,
Alex from Felgo

[Paweł]

I am using Ubuntu 20.04.2 LTS

[GregorFelgo Team]

Hello @Pawel,
I made a fresh Ubuntu 20.04 VM and tried to reproduce your issue. However it worked fine and I couldn’t reproduce the issue.
Beside Felgo SDK, installed these packages:

 sudo apt-get install g++ libglu1-mesa-dev libpulse-dev libglib2.0-dev \
                      build-essential git  libssl-dev qt5-default

 

Then Created new Felgo application with wizard, cloned the library, updated pro and added scan example from the library documentation.
https://postimg.cc/jCQS18Pp

PS: Also tried with Ubuntu 18.04, also no problem there.

 

gregor from Felgo