Qt3d Sample "basicshapes-cpp" run with -platform eglfs

[jackun]

Qt3d Sample "basicshapes-cpp", start with parameters -platform eglfst.
The program endups with :
EGLFS: OpenGL windows cannot be mixed with others.

what i do :

1. the project is in the qtcreator examples. build with DesktopKit Qt.5.12.8
   the program endup with:
   Attribute Qt::AA_ShareOpenGLContexts must be set before QCoreApplication is created.
   EGLFS: OpenGL windows cannot be mixed with others.
2. add QCoreApplication::setAttribute(Qt::AA_ShareOpenGLContexts, true); before QApplication
   the program end with:
   Warning: Setting a new default format with a different version or profile after the global shared context is created may cause issues with context sharing.
   EGLFS: OpenGL windows cannot be mixed with others.
3. use qt3dwindow.h/cpp from https://codereview.qt-project.org/gitweb?p=qt/qt3d.git;a=commit;h=refs/changes/84/201784/3.
   the program end with:
   EGLFS: OpenGL windows cannot be mixed with others.

Does anyone have any advices?
Thank you