Build a Debug mode on linux

DmitriyMarin

Great! Congratulations!
What was the problem? The generators in the Kit? If so which one did you set?

DmitriyMarin

You can find more SAMSON Developer tutorials and we will be adding more source code soon on github: https://github.com/1A-OneAngstrom/SAMSON-Developer-Tutorials/tree/develop. For example, you may check the AtomShaker tutorial.

Laëtitia

yes it was the kits, there was no autodetected ones.

Laëtitia

Hello,

I am now stuck with the launching of SAMSON-Debug. the launchind fails and says:
This application failed to start because it could not find or load the Qt platform plugin "xcb"in "".
Reinstalling the application may fix this problem.

I tried to reinstall, not changing anything...

Best

DmitriyMarin

Dear @Laëtitia

Do you try to launch with SAMSON Element Samples from github? If so, then in the root CMakeLists.txt you need to disable PyBindTutorial (just comment ADD_SUBDIRECTORY( PyBindTutorial )).

Laëtitia

euh no, I just tried to launch SAMSON-Core.sh in NANO-D/SDK/0.7.0/SAMSON-Debug/Binaries to have a look at the "new" element I created (the empty one I had problem displaying and compiling before with Qt)

DmitriyMarin

@Laëtitia

Have you provided a path to your Qt installation in the SAMSON-Core.sh script for SAMSON-Debug?

It should be smth like this: export LD_LIBRARY_PATH=/home/YourUser/Qt/Qt5.9.3/5.9.3/gcc_64/lib:$script_dir:$LD_LIBRARY_PATH

Laëtitia

yes, I did
export LD_LIBRARY_PATH=$script_dir:/home/bomble/Qt5.9.3/5.9.3/gcc_64/lib/:$LD_LIBRARY_PATH

DmitriyMarin

Does SAMSON launch in Release mode?

Could you, please, try adding into the SAMSON-Core.sh script for SAMSON-Debug the a path to Qt platforms (/home/bomble/Qt5.9.3/5.9.3/gcc_64/plugins/platforms) to the LD_LIBRARY_PATH environment variable:
LD_LIBRARY_PATH=$script_dir:/home/bomble/Qt5.9.3/5.9.3/gcc_64/lib/:/home/bomble/Qt5.9.3/5.9.3/gcc_64/plugins/platforms:$LD_LIBRARY_PATH
which should provide a path to platforms ("xcb" including).

Do you have any Python installed with PyQt5 and their paths set into PATH or LD_LIBRARY_PATH ? The platforms and Qt libs from Python installation may interfere.

Laëtitia

Hello,

Yes Samson launch in Release mode.
Adding /home/bomble/Qt5.9.3/5.9.3/gcc_64/plugins/platforms path does not change anything (even if libqxcb.so is indeed there!).
export LD_LIBRARY_PATH=$script_dir:/home/bomble/Qt5.9.3/5.9.3/gcc_64/lib/:/home/bomble/Qt5.9.3/5.9.3/gcc_64/plugins/platforms/:$LD_LIBRARY_PATH

I don't have PyQt5 installed at all.

Laëtitia

if after setting the path I ldd the exe, I have only one lib with xcb in it called:
libxcb.so.1 => /usr/lib/x86_64-linux-gnu/libxcb.so.1 (0x00007f820fc81000)
it's not calling for qxcb.
Maybe I should installe another version of libxcb.so.1?

DmitriyMarin

@Laëtitia

Could you, please, try making the following symbolic links in the SAMSON-Debug/Binaries folder :

cd ~/NANO-D/SDK/0.7.0/SAMSON-Debug/Binaries
ln -s ~/Qt5.9.3/5.9.3/gcc_64/plugins/platforms/ ./platforms
ln -s ~/Qt5.9.3/5.9.3/gcc_64/plugins/xcbglintegrations/ ./xcbglintegrations

If the symbolic links won't make it work, could you, please, try copying these folders from the Qt installation into the SAMSON-Debug/Binaries folder.

Laëtitia

the symbolic links stuff worked! thanks a lot, but I don't understand why it works now, could you explain me?

DmitriyMarin

@Laëtitia

Great! Sorry for this issue!

It is due to Qt debug libraries not being shipped together with SAMSON-Debug because they are too heavy. That's why you need to install Qt and apart from providing a path to Qt libraries themselves it is sometimes necessary to provide a path to the plugins folder (Qt5.9.3/5.9.3/gcc_64/plugins, subfolders platforms and xcbglintegrations in particular).

What can also be done instead of creating symbolic links is to provide these paths in your ~/.bashrc file (this works for me on Ubuntu)

QT_VERSION=Qt5.9.3/5.9.3
export QT_PATH=$HOME/$QT_VERSION
export QT5_CMAKE_INCLUDE_DIR=$QT_PATH/gcc_64/lib/cmake/
export QT5_PLATFORM_LIBRARY_PATH=$QT_PATH/gcc_64/plugins/platforms/
export LD_LIBRARY_PATH=$QT5_PLATFORM_LIBRARY_PATH:$LD_LIBRARY_PATH

Laëtitia

ok I see.
Now I can start playing!

Thanks for help and patience.

DmitriyMarin

Good luck @Laëtitia !
You can check https://github.com/1A-OneAngstrom/SAMSON-Developer-Tutorials/tree/develop for some SAMSON Elements Samples. We will be adding more soon.

Feel free to ask questions!