Cannot find XCB plugin

Question

I have cross compiled and deployed Qt 5.11.1 to Raspberry PI 3 using this tutorial: https://wiki.qt.io/RaspberryPi2EGLFS

So far everything worked, until I got stuck at point 15:

[on RPi] Run example, that we've built before. At this point it should just work at fullscreen with 60 FPS and mouse, keyboard, and possibly touch support.

My problem is the following:

pi@raspberrypi:~ $ ./qopenglwidget 
This application failed to start because it could not find or load the Qt platform plugin "xcb"
in "".

Available platform plugins are: eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, xcb.

Reinstalling the application may fix this problem.
Przerwane

It seems like Rpi doesnt have proper XCB directory. On the other hand it lists available plugins, so the path should be fine?

ldd returns the following:

pi@raspberrypi:~ $ ldd qopenglwidget 
    linux-vdso.so.1 (0x7ec7f000)
    /usr/lib/arm-linux-gnueabihf/libarmmem.so (0x76f58000)
    libQt5Widgets.so.5 => /usr/lib/arm-linux-gnueabihf/libQt5Widgets.so.5 (0x769f2000)
    libQt5Gui.so.5 => /usr/lib/arm-linux-gnueabihf/libQt5Gui.so.5 (0x765cc000)
    libQt5Core.so.5 => /usr/local/qt5pi/lib/libQt5Core.so.5 (0x7608e000)
    libbrcmGLESv2.so => /opt/vc/lib/libbrcmGLESv2.so (0x76069000)
    libpthread.so.0 => /lib/arm-linux-gnueabihf/libpthread.so.0 (0x76040000)
    libstdc++.so.6 => /usr/lib/arm-linux-gnueabihf/libstdc++.so.6 (0x75ef8000)
    libm.so.6 => /lib/arm-linux-gnueabihf/libm.so.6 (0x75e79000)
    libgcc_s.so.1 => /lib/arm-linux-gnueabihf/libgcc_s.so.1 (0x75e4c000)
    libc.so.6 => /lib/arm-linux-gnueabihf/libc.so.6 (0x75d0d000)
    /lib/ld-linux-armhf.so.3 (0x76f6e000)
    libharfbuzz.so.0 => /usr/lib/arm-linux-gnueabihf/libharfbuzz.so.0 (0x75c76000)
    libz.so.1 => /lib/arm-linux-gnueabihf/libz.so.1 (0x75c4f000)
    libpng16.so.16 => /usr/lib/arm-linux-gnueabihf/libpng16.so.16 (0x75c15000)
    libdouble-conversion.so.1 => /usr/lib/arm-linux-gnueabihf/libdouble-conversion.so.1 (0x75bf3000)
    libdl.so.2 => /lib/arm-linux-gnueabihf/libdl.so.2 (0x75be0000)
    libbrcmEGL.so => /opt/vc/lib/libbrcmEGL.so (0x75ba7000)
    libbcm_host.so => /opt/vc/lib/libbcm_host.so (0x75b80000)
    libvchiq_arm.so => /opt/vc/lib/libvchiq_arm.so (0x75b6a000)
    libvcos.so => /opt/vc/lib/libvcos.so (0x75b50000)
    librt.so.1 => /lib/arm-linux-gnueabihf/librt.so.1 (0x75b39000)
    libglib-2.0.so.0 => /lib/arm-linux-gnueabihf/libglib-2.0.so.0 (0x75a31000)
    libfreetype.so.6 => /usr/lib/arm-linux-gnueabihf/libfreetype.so.6 (0x75996000)
    libgraphite2.so.3 => /usr/lib/arm-linux-gnueabihf/libgraphite2.so.3 (0x75963000)
    libpcre.so.3 => /lib/arm-linux-gnueabihf/libpcre.so.3 (0x758ea000)

It looks ok to me. I also tried this with no success: (Qt 5.4.1) This application failed to start because it could not find or load the Qt platform plugin "xcb"

you have compiled for eglfs, not for xcb, so you must launch your application with the following command: `./qopenglwidget -platform eglfs` — eyllanesc, Aug 01 '18 at 09:51
I think both should work. When run with eglfs parameter, the situation is the same, it just says that it cannot find eglfs instead of xbc. — Łukasz Przeniosło, Aug 01 '18 at 09:52
then that indicates that you have not installed correctly. :) — eyllanesc, Aug 01 '18 at 09:54
I have installed Qt 5.10.1 in Rpi following that manual in part and I have no problems. — eyllanesc, Aug 01 '18 at 09:57
I am using 5.11.1, can this be a problem? In the past I have installed lower Qt version using it as well. — Łukasz Przeniosło, Aug 01 '18 at 09:58
could be, when I wanted to compile Qt 5.11 when the first release was released I had compilation problems for the compatibility of some libraries, so far I have not tried again. — eyllanesc, Aug 01 '18 at 10:00
Let us [continue this discussion in chat](https://chat.stackoverflow.com/rooms/177174/discussion-between-bremen-and-eyllanesc). — Łukasz Przeniosło, Aug 01 '18 at 10:05
Hello, I have just recreated all steps for QT 5.10.1 and the problem remains the same. — Łukasz Przeniosło, Aug 02 '18 at 05:49
I had problems compiling Qt 5.10 with the manual that you indicate so combine the procedure of these 2 tutorials. https://www.raspberrypi.org/forums/viewtopic.php?t=204529, https://wiki.qt.io/RaspberryPi2EGLFS — eyllanesc, Aug 02 '18 at 05:50
Just solved it, thanks to this answer: https://stackoverflow.com/questions/33189348/compiling-qt-base-error-libqt5core-so-5-no-version-information-available#33209037 — Łukasz Przeniosło, Aug 02 '18 at 06:03

Cannot find XCB plugin

0 Answers0