RaspberryPi2EGLFS guide - EGL/GLES libraries fix fail

rrd0

I built Qt 5.12.3 for Raspberry Pi following the RaspberryPi2EGLFS guide from Qt Wiki.

I was able to reproduce almost each one of the steps described in the guide, but on step 14 (EGL/GLES libraries fix), I failed to create some symbolic links.

I couldn't create the following links

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

because the files /opt/vc/lib/libEGL.so and /opt/vc/lib/libGLESv2.so already exist.

So, I moved those files to /opt/vc/lib/libEGL.so_backup and /opt/vc/lib/libGLESv2.so_backup, then I created the symbolic links and the rest of the steps worked like a charm.

But I have a problem. Apps that run on another Qt build are crashing on this one. So, I think the problem may be those symbolic links.

Are the symbolic links correct? Am I missing something? Anybody here had the same problem with EGLFS? If yes, how did you fix?

Thanks!

sierdzio

Try bringing back your backup libs and running on them. I think raspbian has fixed this issue already (not sure) so symlinking may not be necessary at all.

Alternatively, try running raspi-config and forcing the prioprietary graphics driver, then symlinking.

rrd0

@sierdzio

I moved the original files back and deleted the links, but that didn't solve the problem. I'm still getting segfaults.

rrd0

@sierdzio said in RaspberryPi2EGLFS guide - EGL/GLES libraries fix fail:

Alternatively, try running raspi-config and forcing the prioprietary graphics driver, then symlinking.

The only GL-related option I found on raspi-config is the one to disable OpenGL (Original non-GL desktop driver). I chose that option, but it didn't work too.

rrd0

A whole week has past and I'm still struggling with this problem.

sierdzio

Sorry but I can't help more. I don't have time right now to try it out again myself. Last time I did was back in Qt 5.10 times, I think, and after enabling the driver in raspi-config it worked.

However, no matter which driver I used, there was no crash - perhaps you are actually facing a different issue? Are you sure your app works OK?

rrd0

@sierdzio said in RaspberryPi2EGLFS guide - EGL/GLES libraries fix fail:

However, no matter which driver I used, there was no crash - perhaps you are actually facing a different issue? Are you sure your app works OK?

Yes, I'm sure. It works fine on another build of Qt.

rrd0

Update:

The app crashs only on exit.
The stack trace shows me that the segfault happens inside QBasicDrag::disableEventFilter().

Information #1 is some help, cause it indicates that something is not being cleaned.

Info #2 also makes sense, cause drag-n-drop is not 100%. When I drag something, the pixmap that represents the drag is invisible.

If you guys have some idea on how to track this error, please let me know.