Sorry folks, the question was vague and the begining of a development... Apparently to make Qt Quick Scene Graph work on an embedded system displaying GUI on the frame buffer, we need to recompile Qt on Yocto, and provide fake/dummy libraries ligEGL.so and libGLES.so Obviously it will be rendered using software, as there is no hardware graphic support in that case, but it still needs "empty" libGLES.so to do so. ...

That's a run time issue you have not compilation.

Hi, Well, if your target sysroot does not provide X11, then the xcb backend won't work. Either add X11 to your target or select a more appropriate backend like EGLFS, LinuxFB, wayland, etc.

@SGaist I don't think so but in the meantime I don't see any package which could do it. My board support OpenGl ES2 so I tried some stuff like adding "PACKAGE CONFIG += "gles2" " to my qtbase bb file but nothing has changed ... Also tried to add PACKAGECONFIG_append_pn-qtbase = "gles2" in my local.conf but no change. After some googling, I found that the error was printed by this code : https://code.qt.io/cgit/qt/qtbase.git/tree/src/plugins/platforms/xcb/qxcbbackingstore.cpp?h=dev (line 371) Edit: Closing this issue, it was a problem of platform (by default it was using x11 which is not the one used by my embedded device) . Thanks a lot for your help again !

This is the output when I build from command line with qmake/make : root@debian:~# echo $QMAKESPEC root@debian:~# source /opt/qtsdk-Guinault-2020.03/environment-setup-armv7at2hf-neon-linux-gnueabi root@debian:~# echo $QMAKESPEC /opt/qtsdk-Guinault-2020.03/sysroots/armv7at2hf-neon-linux-gnueabi/usr/lib/mkspecs/linux-oe-g++ root@debian:~# mkdir hellowolrd_qt root@debian:~# cd hellowolrd_qt/ root@debian:~/hellowolrd_qt# nano helloworld.cpp root@debian:~/hellowolrd_qt# nano helloworld.pro root@debian:~/hellowolrd_qt# qmake helloworld.pro Info: creating stash file /root/hellowolrd_qt/.qmake.stash root@debian:~/hellowolrd_qt# make arm-linux-gnueabihf-g++ -march=armv7-a -mthumb -mfpu=neon -mfloat-abi=hard --sysroot=/opt/qtsdk-Guinault-2020.03/sysroots/armv7at2hf-neon-linux-gnueabi -c -pipe -isystem/home/guinault/gcc-arm-8.3-2019.03-x86_64-arm-linux-gnueabihf/arm-linux-gnueabihf/include -O2 -pipe -g -feliminate-unused-debug-types --sysroot=/opt/qtsdk-Guinault-2020.03/sysroots/armv7at2hf-neon-linux-gnueabi -O2 -Wall -W -D_REENTRANT -fPIC -DQT_NO_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -I. -I/opt/qtsdk-Guinault-2020.03/sysroots/armv7at2hf-neon-linux-gnueabi/usr/include/QtWidgets -I/opt/qtsdk-Guinault-2020.03/sysroots/armv7at2hf-neon-linux-gnueabi/usr/include/QtGui -I/opt/qtsdk-Guinault-2020.03/sysroots/armv7at2hf-neon-linux-gnueabi/usr/include/QtCore -I. -I/opt/qtsdk-Guinault-2020.03/sysroots/armv7at2hf-neon-linux-gnueabi/usr/lib/mkspecs/linux-oe-g++ -o helloworld.o helloworld.cpp In file included from /opt/qtsdk-Guinault-2020.03/sysroots/armv7at2hf-neon-linux-gnueabi/usr/include/QtGui/qtguiglobal.h:43, from /opt/qtsdk-Guinault-2020.03/sysroots/armv7at2hf-neon-linux-gnueabi/usr/include/QtWidgets/qtwidgetsglobal.h:43, from /opt/qtsdk-Guinault-2020.03/sysroots/armv7at2hf-neon-linux-gnueabi/usr/include/QtWidgets/qapplication.h:43, from /opt/qtsdk-Guinault-2020.03/sysroots/armv7at2hf-neon-linux-gnueabi/usr/include/QtWidgets/QApplication:1, from helloworld.cpp:1: /opt/qtsdk-Guinault-2020.03/sysroots/armv7at2hf-neon-linux-gnueabi/usr/include/QtCore/qglobal.h:45:12: fatal error: type_traits: No such file or directory # include <type_traits> ^~~~~~~~~~~~~ compilation terminated. Makefile:547: recipe for target 'helloworld.o' failed make: *** [helloworld.o] Error 1 root@debian:~/hellowolrd_qt# And this is CXX and CXXFLAGS : root@debian:~/hellowolrd_qt# . /opt/qtsdk-Guinault-2020.03/environment-setup-armv7at2hf-neon-linux-gnueabi root@debian:~/hellowolrd_qt# echo $CXX arm-linux-gnueabihf-g++ -march=armv7-a -mthumb -mfpu=neon -mfloat-abi=hard --sysroot=/opt/qtsdk-Guinault-2020.03/sysroots/armv7at2hf-neon-linux-gnueabi root@debian:~/hellowolrd_qt# echo $CXXFLAGS -isystem/home/guinault/gcc-arm-8.3-2019.03-x86_64-arm-linux-gnueabihf/arm-linux-gnueabihf/include -O2 -pipe -g -feliminate-unused-debug-types Anyone can help me please ? Thank you Sébastien

@nikoPol said in Programme QT ne reconnait les drivers MYSQL: Il n'y a pas d'autre moyen Non, il faut compiler les drivers pour votre cible avec les paramètres adéquats, soit directement à partir de Yocto, soit "à la main", à partir des sources de Qt. Peut-être que ce lien pourra vous être utile: https://www.udoo.org/forum/threads/solved-how-to-use-sql-model-with-qt5-layer.5136/ Désolé, je n'ai que des connaissances de base concernant Yocto... Et ca fait bien 3 ans que je ne l'ai plus mis en oeuvre!

Just wanted to say thanks! I ran into the same issue (building qtwebengine) on Ubuntu 18.04 host and this fixed it. I'm adding it to my personal list of prerequisites for my Boot2Qt Yocto builds....

@Cleiton-Bueno Thank you very much for providing me more information on the Yocto language selection.

I've got the same situation on my iMX6 with Yocto Rocko. Any solution for this issue? Is the same situation on new release Sumo or Thud?

@tomasz3dk Thanks for the help I did get this working.

Hi, GStreamer in OpenCV ? Shouldn't you rather post this question on either or maybe both of their forum ?

@hflw I continue on ur thread that u've created https://forum.qt.io/topic/75316/qt5-8-for-arm-could-not-open-egl-display

@rickY79 Any of those versions should work if you have the tool chain

@VincentB said: Sorry but I'm not sure to find where to find this stack window .. (I'm using qtcreator 3.6.0) see this.

@jsulm Ok, i will makes progress goes on. Thank you very much. Best Regards.

@MarceloGomez my skype is nostrik7180 . Can we discuss about your project ?

4.7 ? Then you will have to take a look at the Qt Mobility module. If you are locked to the Qt 4 series, please upgrade to at least 4.8.7. If not locked then consider using Qt 5.6.0 which just got released and is LTS.

Fine, Thanks.

I finally got to solve this by myself. I only had to add 'libqgfxtransformed.so' to my target's /usr/lib/qtopia/plugins/gfxdrivers folder. I then ran my app using the '-qws -display transformed:rot90' switch and I got my rotation done!