could not find qtplatfom plugin eglfs

Asha

while giving the /home/debian

here is the compile output:
11:13:06: Running steps for project concentriccircles...
11:13:06: Configuration unchanged, skipping qmake step.
11:13:06: Starting: "/usr/bin/make" -j4
make: Nothing to be done for 'first'.
11:13:06: The process "/usr/bin/make" exited normally.
11:13:06: The remote file system has 46 megabytes of free space, going ahead.
11:13:06: Deploy step finished.
11:13:06: Trying to kill "/home/debian/Qt5/concentriccircles" on remote device...
11:13:08: Remote application killed.
11:13:08: Deploy step finished.
11:13:08: sending incremental file list

11:13:08:
sent 72 bytes received 12 bytes 168.00 bytes/sec
total size is 1,576,416 speedup is 18,766.86

11:13:08: Deploy step finished.
11:13:08: Elapsed time: 00:03.

And

Application output is:

11:13:09: Starting /home/debian/Qt5/concentriccircles ...
qt.qpa.plugin: Could not find the Qt platform plugin "eglfs" in ""
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

Available platform plugins are: linuxfb, minimal, offscreen, vnc.

11:13:09: Remote process crashed.

jsulm

@Asha said in could not find qtplatfom plugin eglfs:

linuxfb, minimal, offscreen, vnc

Looks like you did not build eglfs support when building Qt

Asha

@jsulm
but other platforms like linuxfb and vnc both are enabled while building qt,

And I exported linuxfb in my device...

one more ,while building I tried with -eglfs option also but got the error like

ERROR: 'eglfs' already enabled...

jsulm

@Asha What do you actually want to use? eglfs? linuxfb? ...?
Adding -eglfs is not going to help as it is already activated, but your Qt build does not support it.

Asha

@jsulm I just want to run one simple application in my device, by using anyone..

jsulm

@Asha Well, I think I already mentioned this once: you have to know what your device actually uses. Is it X11, eglfs, linuxfb, ...?

Asha

@jsulm

can you please tell me more about X11,or any link..what exactly it will do?

jsulm

@Asha Google knows https://en.wikipedia.org/wiki/X_Window_System

Asha

@jsulm It means first i need to find which backend is running on my device ,based on that I need to cross compile the qt?

jsulm

@Asha said in could not find qtplatfom plugin eglfs:

i need to find which backend is running on my device

yes

Asha

@jsulm after finding ,again i need to build ,cross compiled qt?

jsulm

@Asha If you did not cross compile needed platform plug-in then yes

Asha

@jsulm Hi,

I flashed my board with debian image...any idea which plugin is running on that image...

I got the answer ,we are using linux backend...

Asha

for eglfs plugin ,which packages are required and how to install those?

jsulm

@Asha Please take a look at https://doc.qt.io/qt-5/embedded-linux.html
"we are using linux backend" - which one?

Asha

@jsulm I asked,which backend is running on board?

got the ans:linux

shall I ask more about backend or any link?

jsulm

@Asha We know from the beginning that the OS is Linux. Linux is an operating system supporting different technologies for graphics, like: X11, directfb, eglfs, ...
These technologies is what is called "backends" in Qt.

Asha

@jsulm Hi ,Thank you for you guide...

I found which plugin is running on my board,
That is eglfs only,

with this link https://doc.qt.io/qt-5/embedded-linux.html

for beagleboneboard my build directory is Qt5,

I got the information in the folder below

cd /home/beagle/Qt5/mkspecs/devices/linux-beagleboard-g++/qmake.conf

in qmake.conf file

QT_QPA_DEFAULT_PLATFORM = eglfs

so now,how to proceed next?

can i change the QT_QPA_DEFAULT_PLATFORM in that file ?

or need to configure with eglfs only?

jsulm

@Asha What did configure say about eglfs? Was it activated?

Asha

@jsulm I gone through this link,https://doc.qt.io/qt-5.12/embedded-linux.html

please go through the selected paragraph in the below screenshot,
in the mentioned the path i got it(dont no its currect or not just guessed)