Not Able to run Qt Application in BeagleBone Black with Qt 5.7

[Milav]

@jsulm hello,

The above error (error while loading shared libraries: libQt5Widgets.so.5) is solved. thanks a lot..
I just copy whole install directory (/usr/local/QT5.7.0) to Beagle Bone Black (/usr/local) path.

but when I again build the qt project, it will give following error.

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

Available platform plugins are: linuxfb, minimal, offscreen.

Reinstalling the application may fix this problem.
bash: line 1: 2072 Aborted DISPLAY=':0.0' QWS_MOUSE_PROTO='LinuxInput:/dev/input/event1' /home/debian/Helloworldapp -qws
Application finished with exit code 134.

can you help me to resove this issues?

[jsulm]

@Milav said in Not Able to run Qt Application in BeagleBone Black with Qt 5.7:

eglfs

Does your Qt build have the eglfs plug-in? Plug-ins are in plugin subdirectory.

[Milav]

@jsulm no, there is not eglfs.so library file in installation directory(/usr/local/Qt5.7.0/plugnis/platforms/) of qt.

when i run application manually with ./App - platform linuxfb it is run but it gives following error

QFontDatabase: Cannot find font directory /usr/local/Qt-5.7.0/lib/fonts.
Note that Qt no longer ships fonts. Deploy some (from http://dejavu-fonts.org for example) or switch to fontconfig.
QFontDatabase: Cannot find font directory /usr/local/Qt-5.7.0/lib/fonts.
Note that Qt no longer ships fonts. Deploy some (from http://dejavu-fonts.org for example) or switch to fontconfig.
QFontDatabase: Cannot find font directory /usr/local/Qt-5.7.0/lib/fonts.
Note that Qt no longer ships fonts. Deploy some (from http://dejavu-fonts.org for example) or switch to fontconfig.
QFontDatabase: Cannot find font directory /usr/local/Qt-5.7.0/lib/fonts.
Note that Qt no longer ships fonts. Deploy some (from http://dejavu-fonts.org for example) or switch to fontconfig.

which is needed platform for Beagle bone black debian Os? as per your knowledge?

what is the next step? to resolve this error?

[jsulm]

@Milav It looks like you need to provide the fonts as well, they should be located in /usr/local/Qt-5.7.0/lib/fonts according the warning. So copy them from your host Qt to /usr/local/Qt-5.7.0/lib/fonts on your target device.

[Milav]

@jsulm ..Hello,

I found inbuilt Fonts Directory of Qt5.7.0, but the result of that find is null.
than I download the fontconfig library (fontconfig-2.12.1)from external sources.
Than compile that library, and than it shows the fonts lib. in /usr/share/fonts .
and than copy this folder to target device in /usr/local/Qt5.7.0/lib/ path..
after doing this the above error was removed..but still i can not see the font in application.
what is the problem?

[jsulm]

@Milav said in Not Able to run Qt Application in BeagleBone Black with Qt 5.7:

i can not see the font in application

What do you mean? You cannot see any text in your application? Or you cannot select one of the fonts?

[Milav]

@jsulm
i cannot see any text in my application.....

[jsulm]

@Milav Which font does your application use? Is this font in /usr/local/Qt5.7.0/lib ?

[Milav]

@jsulm
I use "DejaVu Sans" font use in application.

and these fonts is available in this path:-
/usr/local/Qt-5.7.0/lib/fonts/truetype/ttf-dejavu

in that directroy ,
DejaVuSans-Bold.ttf DejaVuSansMono-Bold.ttf DejaVuSansMono.ttf DejaVuSans.ttf DejaVuSerif-Bold.ttf DejaVuSerif.ttf

files are stored.

[jsulm]

@Milav Try to print the content of the list returned by http://doc.qt.io/qt-5/qfontdatabase.html#applicationFontFamilies to the standard output and see what you get.

[Milav]

@jsulm
i will try http://doc.qt.io/qt-5/qfontdatabase.html#applicationFontFamilies , but still i can not see the text in qt application on Beaglebone black gui window...

still i miss some package of fonts in Beaglebone black.

can anyone suggest me for this package.?

[Milav]

Hello @jsulm

I just found that when i write the following command in build directory that enable the fontconfig , and XCB package....

#./configure -prefix /usr/local/qt_install

but when i use following command in build directory that disable the fontconfig and xcb package.

#./configure -prefix /usr/local/qt_install -xplatform linux-arm-gnueabihf -device linux-beagleboard-g++ -device-option CROSS_COMPILE=/opt/gcc-arm-linux/bin/arm-linux-gnueabihf-

so where is the problem?

[jsulm]

@Milav Most probably your sysroot does not contain header files and libraries for fontconfig and xcb. You can see what is missing by adding -v parameter to configure.

[Milav]

Hello ,

I added -sysroot in configuration command so that all header and libraries are to be added.

I used external SD card as a sysroot path. In SD card i use same image version as in target device image.

but this give me a following error...

Project ERROR: No module claims plugin type 'scenegraph'
make[4]: *** [sub-softwarecontext-make_first] Error 3
make[4]: Leaving directory /root/qt_build_23nov/qtdeclarative-render2d/src/plugins/scenegraph' make[3]: *** [sub-scenegraph-make_first] Error 2 make[3]: Leaving directory /root/qt_build_23nov/qtdeclarative-render2d/src/plugins'
make[2]: *** [sub-plugins-make_first] Error 2
make[2]: Leaving directory /root/qt_build_23nov/qtdeclarative-render2d/src' make[1]: *** [sub-src-make_first] Error 2 make[1]: Leaving directory /root/qt_build_23nov/qtdeclarative-render2d'
make: *** [module-qtdeclarative-render2d-make_first] Error 2

so where is the problem?

[Milav]

Hello @jsulm ,

I resolved the above error by adding the -opengl option in configure option.

Now I build the Qt 5.7.0 for BeagleBone Black.

but when I run the application for BBB, qt gives following error..

stdin: is not a tty
No protocol specified
QXcbConnection: Could not connect to display :0.0
bash: line 1: 1853 Aborted DISPLAY=':0.0' QWS_MOUSE_PROTO='LinuxInput:/dev/input/event1' /home/debian/QTapp -qws
Application finished with exit code 134.

so where is the problem?

[jsulm]

@Milav Are you running a X server on your device?

[Andrey Shmelew]

Hello to all!
I have exactly the same problem as above.
Host machine: VirtualBox Ubuntu 14.04 32 bit with Qt 5.5.1 installed on it
Device: BeagleBone Black with debian 8.4 on it.

So when i compile my Application for Desktop QT 5.5.1, it goes good,
but when i tried to upload my application on the Board, qt says:
stdin: is not a tty
bash: /home/root/coding: cannot execute binary file: Exec format error
Application ended with error code 126 (Приложение завершилось с кодом 126).
i used for this gcc (x86 32bit) compiler. i know that it's wrong compiler.

When i choose right (in my mind) compiler arm-linux-gnueabi-gcc, an error "ompiler cannot produce code"

Please see screenshots (sorry for cyrillic)

I am tying to crosscompile my app for beaglebone black for a weeks, please help me

[Milav]

@Andrey-Shmelew

you may be use wrong complier for the beagle bone black...

The host and Target specification are different from your specification.

I have 64 BIT bit Ubuntu on VMware and qt 5.7.0 is installed on that pc.
and i have Beagle Bone Black with debian 7.11 on it.

But i think cross-compiler toolchain is same for both of us...
so you can try with gcc-linaro-arm-linux-gnueabihf-4.8-2014.04_linux.tar.xz version.

and please check that you installed the sources at the time of installation.

Let me know if any progress occur..

[Milav]

@jsulm

i dont know...

the LCD cape is connected on the BeagleBone black.

is this run on X-server?

[jsulm]

@Andrey-Shmelew said in Not Able to run Qt Application in BeagleBone Black with Qt 5.7:

bash: /home/root/coding: cannot execute binary file: Exec format error

Sorry, your problem is completely different"!
Please open a new thread.