EGLFS problem on Raspberry Pi 2 Qt 5.8 Static

Nikita Kopylov

Hello.
I get a strange error with my static application running on Raspberry Pi 2.
I am using Buildroot on my RPI2 with qt 5.8 support (i am choose it in buildroot configuration).
I just build static qt 5.8 on my Ubuntu 16.04 with cross-toolchain for buildroot, build and compile a static application for my Raspberry Pi 2 with buildroot cross-compiler, and when i'm running it on RPI2, i get this error:

This application failed to start because it could not find or load the Qt platform plugin "eglfs"
in "".

Reinstalling the application may fix this problem.
Aborted.

So, i am configure static qt with this command:

./configure -prefix /home/kopylov/Develope/qt-5.8.0-static-raspberrypi2 -debug -static -device linux-rasp-pi2-g++ -device-option CROSS_COMPILE=/home/kopylov/Develope/br2017/output/host/usr/bin/arm-buildroot-linux-gnueabihf- -skip qtwebengine -opengl es2 -nomake examples -nomake tests -sysroot /home/kopylov/Develope/br2017/output/host/usr/arm-buildroot-linux-gnueabihf/sysroot -opensource -confirm-license -v

where CROSS_COMPILE - path to my buildroot toolchain, sysroot - path to sysroot,
which was created, when i build a buildroot.

Qt was build without errors (but with some warnings) , to this dir:

/home/kopylov/Develope/br2017/output/host/usr/arm-buildroot-linux-gnueabihf/sysroot/home/kopylov/Develope/qt-5.8.0-static-raspberrypi2

And on RPI qt 5.8 now in a dir:

/home/kopylov/Develope/qt-5.8.0-static-raspberrypi2/

One thing i cant make:

echo /home/kopylov/Develope/qt-5.8.0-static-raspberrypi2/lib | sudo tee /etc/ld.so.conf.d/qt5pi.conf
sudo ldconfig

Because i have not ldconfig in my buildroot...

I am build and compile my static application, using this commands:

cd /to/my/qt/project
make clean
/home/kopylov/Develope/br2017/output/host/usr/arm-buildroot-linux-gnueabihf/sysroot/home/kopylov/Develope/qt-5.8.0-static-raspberrypi2/bin/qmake 
 /home/kopylov/Develope/Projects/Witronic-develop-static-rpi2/Witronic.pro  -spec /home/kopylov/Develope/br2017/output/host/usr/mkspecs/devices/linux-buildroot-g++ CONFIG+=debug CONFIG+=qml_debug && /usr/bin/make 
make

There was some errors, because there wasn't directory and libs in:

/home/kopylov/Develope/br2017/output/host/usr/arm-buildroot-linux-gnueabihf/sysroot/opt/vc/lib

I am create this dir and copy all nedeed libs (like libqeglfs.a) from

home/kopylov/Develope/br2017/output/host/usr/arm-buildroot-linux-gnueabihf/sysroot/home/kopylov/Develope/qt-5.8.0-static-raspberrypi2/plugins/platforms/libqeglfs.a

to

/home/kopylov/Develope/br2017/output/host/usr/arm-buildroot-linux-gnueabihf/sysroot/opt/vc/lib

Then, my static application was build success, without errors.

Then, I am copy it to my Raspberry Pi 2, and when i start it, i get this err:

This application failed to start because it could not find or load the Qt platform plugin "eglfs"
in "".

Reinstalling the application may fix this problem.
Aborted.

I tried to fill var QT_QPA_PLATFORM_PLUGIN_PATH with path to plugins on my RPI2 (libqeglfs.a is in /home/kopylov/Develope/qt-5.8.0-static-raspberrypi2/plugins/platforms/)
And it's not working, i get errors like this:

This application failed to start because it could not find or load the Qt platform plugin "eglfs"
in "/home/kopylov/Develope/qt-5.8.0-static-raspberrypi2/plugins/platforms".

Also, i tried to add this code to .pro:

CONFIG += plugin
QTPLUGIN += qeglfs
LIBS += libqeglfs.a

and remake+recompile app
And it is not working too.

Also, i try to copy /usr/lib/qt/plugins/platforms/libqeglfs.a to the dir with my static application, and in my_app_dir/platforms dir

And it is not working too.

Also, i have non-static application, i am build and compile it with QtCreator and cross-compiler for buildroot, i just copy compiled binary file to my RPI2 and it is working well.

Where i goes wrong?

Thank you for anwsers.