QT Creator can not remote run and debugging on i.Mx6 (buildroot)

Question

Using Qt Creator 4.0.2 base on Qt 5.7.0, my app name is test

Board : i.M6Q with buildroot (Qt 5.9)

Questions:

A. When I run qt app show this error

EGL library doesn't support Emulator extensions 
Aborted
Application finished with exit code 134.

But I can run qt app in board using ./test, and it shows normally

B. And When I start debugging show this error

The GDB process terminated unexpectedly (exit code 1)

How to fix these errors?

The following is what I have set up:

1. test.pro

   QT += core gui
   greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
   TARGET = test
   TEMPLATE = app
   SOURCES += main.cpp\
   mainwindow.cpp
   HEADERS  += mainwindow.h
   FORMS    += mainwindow.ui
   
   target.path = /root/test
   INSTALLS += target
   

2. Tools > Options > Build & Run > Compilers

   Name : imx6 buildroot GCC

   buildroot/output/host/usr/bin/arm-buildroot-linux-uclibcgnueabihf-g++
   

3. Tools > Options > Build & Run > Debuggers

   Name : IMX6 buildroot gdb

   buildroot/output/host/usr/bin/arm-buildroot-linux-uclibcgnueabihf-gdb
   

4. Tools > Options > Build & Run > Qt Versions

   Version Name : Qt %{Qt:Version} (buildroot)

   buildroot/output/host/usr/bin/qmake
   

5. Tools > Options > Build & Run > Kits look like this image

6. Tools > Options > Devices:

   Device test finished successfully.
   

7. This is my main.cpp

   #include "mainwindow.h"
   #include <QApplication>
   int main(int argc, char *argv[])
   {
       QApplication a(argc, argv);
       MainWindow w;
       w.show();
   
       return a.exec();
   }
   

Answer 1

This is a reported Qt BUG The problem is that the build system does not select the correct eglfs backend

The solution is to export:

QT_QPA_EGLFS_INTEGRATION=eglfs_viv before running Qt apps, or

QT_QPA_EGLFS_INTEGRATION=none