cross compiled qt for BBB

Pablo J. Rogina

@Asha in addition to @jsulm question,

Do you start your app as root or normal user?

How are you starting your application:
Do you have a physical keyboard attached to the board?
Or do you connect to the board from PC with a SSH session?

Asha

@jsulm said in cross compiled qt for BBB:

You get "Qxcb connection:could not connect to the display"?

yes

Do you start your app as a root

this means ,first i need to do

ssh debian@192.168.7.2
after this sudo su

root@beaglebone:

now I need to run the application right?

but what about that normal user?
I need to run it on my Desktop machine?
without ssh?

jsulm

@Asha said in cross compiled qt for BBB:

after this sudo su

NO! You should not start it as root.

Can you connect a keyboard to your device and start directly there without SSH.

Pablo J. Rogina

@Asha said in cross compiled qt for BBB:

ssh debian@192.168.7.2

Ok, after millions of posts we finally reach the point where you stated how you're starting the application in the board...

It looks like you're NOT forwarding the X display. Please try connecting to the board this way:

ssh -X debian@192.168.7.2

and then proceed as you've been doing to start the Qt app

Asha

@Pablo-J-Rogina

while connecting as you said above ,

getting the result

s
libEGL warning: DRI3: failed to query the version
libEGL warning: DRI2: failed to authenticate
./animatedtiles: relocation error: ./animatedtiles: symbol _ZN18QRandomGenerator646globalEv, version Qt_5 not defined in file libQt5Core.so.5 with link time reference

jsulm

@Asha Deploy your app correctly (include your cross compiled Qt libraries). Looks like you have different Qt version on your device than the one you cross compiled.

Asha

@jsulm

I have those libraries in usr lib directory

root@beaglebone:find / -name libGLESv2* -type f
/usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0
root@beaglebone: find / -name libEGL* -type f
/usr/lib/arm-linux-gnueabihf/libEGL_mesa.so.0.0.0
/usr/lib/arm-linux-gnueabihf/libEGL.so.1.0.0

@jsulm said in cross compiled qt for BBB:

Looks like you have different Qt version on your device than the one you cross compiled.

how do I found,which version qt is running on my device?

jsulm

@Asha Do

ldd YOUR_EXECUTABLE

on your device and see which Qt libs linker finds.

Asha

@jsulm

this is the result:

debian@beaglebone:~/Qt5/examples/widgets/animation/animatedtiles$ ldd ./animatedtiles
linux-vdso.so.1 (0xbeffe000)
libQt5Widgets.so.5 => /usr/lib/arm-linux-gnueabihf/libQt5Widgets.so.5 (0xb6b07000)
libQt5Gui.so.5 => /usr/lib/arm-linux-gnueabihf/libQt5Gui.so.5 (0xb67dd000)
libQt5Core.so.5 => /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5 (0xb6469000)
libpthread.so.0 => /lib/arm-linux-gnueabihf/libpthread.so.0 (0xb6445000)
librt.so.1 => /lib/arm-linux-gnueabihf/librt.so.1 (0xb642f000)
libdl.so.2 => /lib/arm-linux-gnueabihf/libdl.so.2 (0xb641c000)
libstdc++.so.6 => /usr/lib/arm-linux-gnueabihf/libstdc++.so.6 (0xb6310000)
libm.so.6 => /lib/arm-linux-gnueabihf/libm.so.6 (0xb6298000)
libgcc_s.so.1 => /lib/arm-linux-gnueabihf/libgcc_s.so.1 (0xb626f000)
libc.so.6 => /lib/arm-linux-gnueabihf/libc.so.6 (0xb6181000)
libGLESv2.so.2 => /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2 (0xb6163000)
/lib/ld-linux-armhf.so.3 (0xb6f44000)
libharfbuzz.so.0 => /usr/lib/arm-linux-gnueabihf/libharfbuzz.so.0 (0xb60e7000)
libz.so.1 => /lib/arm-linux-gnueabihf/libz.so.1 (0xb60c5000)
libpng16.so.16 => /usr/lib/arm-linux-gnueabihf/libpng16.so.16 (0xb6095000)
libicui18n.so.57 => /usr/lib/arm-linux-gnueabihf/libicui18n.so.57 (0xb5ee8000)
libicuuc.so.57 => /usr/lib/arm-linux-gnueabihf/libicuuc.so.57 (0xb5dbf000)
libpcre16.so.3 => /usr/lib/arm-linux-gnueabihf/libpcre16.so.3 (0xb5d67000)
libdouble-conversion.so.1 => /usr/lib/arm-linux-gnueabihf/libdouble-conversion.so.1 (0xb5d49000)
libglib-2.0.so.0 => /lib/arm-linux-gnueabihf/libglib-2.0.so.0 (0xb5c6e000)
libGLdispatch.so.0 => /usr/lib/arm-linux-gnueabihf/libGLdispatch.so.0 (0xb5bf0000)
libfreetype.so.6 => /usr/lib/arm-linux-gnueabihf/libfreetype.so.6 (0xb5b77000)
libgraphite2.so.3 => /usr/lib/arm-linux-gnueabihf/libgraphite2.so.3 (0xb5b4c000)
libicudata.so.57 => /usr/lib/arm-linux-gnueabihf/libicudata.so.57 (0xb42bf000)
libpcre.so.3 => /lib/arm-linux-gnueabihf/libpcre.so.3 (0xb4260000)

In this libEGL library missing ,how do I solve this ?

jsulm

@Asha Your current problem is not libEGL.
The problem is here: ./animatedtiles: relocation error: ./animatedtiles: symbol _ZN18QRandomGenerator646globalEv, version Qt_5 not defined in file libQt5Core.so.5 with link time reference

Are these Qt libs the libs you cross compiled and exact same version you're using on your host to cross compile your app?

libQt5Widgets.so.5 => /usr/lib/arm-linux-gnueabihf/libQt5Widgets.so.5 (0xb6b07000)
libQt5Gui.so.5 => /usr/lib/arm-linux-gnueabihf/libQt5Gui.so.5 (0xb67dd000)
libQt5Core.so.5 => /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5 (0xb6469000)

Asha

@jsulm

my configure command is exactly as shown in below ,please go through this

./configure -platform linux-g++ release -device linux-beagleboard-g++ -sysroot /home/beagle/BBB/sysroot -prefix /home/debian/Qt5 -hostprefix ~/Qt5 -device option
CROSS_COMPILE = /home/beagle/BBB/gcc-linaro......gnuabihf- -nomake tests -nomake examples -no-opengl -opensource -confirm-license -reduce-exports -make libs -no-egl -no-eglfs -qt-zlib -qt-libpng -no-use-gold-linker-linuxfb -qt-libjpeg -no-opengl -no-cups -no-glib -no-iconv -nomake examples -nomake tools -nomake tests -no-pkg-config -skip qtdeclarative -skip qtlocation -skip qtpurchasing -skip qtwayland -skip qtwebchannel -skip qtwebengine -skip qtwebsockets -skip qtwebview -skip qtwebglplugin -skip qtandroisextras -skip qtgamepad -skip qtmacextras -skip qtwinextras -skip qtsensors -skip qtconnectivity -recheck-all -v

any mistakes in this configuration then please let me know..(if any mistakes then what configuration I need to give ,for my X server, beagleboneboard,just i want to run a simple qt application in my board and display the output in my display screen)...

jsulm

@Asha You did not answer my question.
Where did you put your cross compiled Qt on the device?

Asha

@jsulm

I copied my cross compiled qt in my board via

scp Qt5 debian@192.168.7.2:Qt5

means directly in my device only,not in any directory(where i need to copy that one)..

SGaist

So you did not copy the libraries at the exact same place on your device ?

Your system installed Qt is picked before the one you copied.

So one solution is to call: LD_LIBRARY_PATH=/path/to/your/cross-compiled_qt/lib ./YOUR_EXECUTABLE_NAME.

jsulm

@Asha said in cross compiled qt for BBB:

means directly in my device only

Your app definitely uses wrong Qt libs.
You have to copy the Qt libs into same directory you specified in -prefix. In your case /home/debian/Qt5.
If this is the case then try following to start your app on device:

cd DIR_WHERE_YOUR_APP_IS
export LD_LIBRARY_PATH=/home/debian/Qt5
./YOUR_APP

Asha

@jsulm

now at present I don't have my display,

but while giving this

@jsulm said in cross compiled qt for BBB:

cd DIR_WHERE_YOUR_APP_IS
export LD_LIBRARY_PATH=/home/debian/Qt5
./YOUR_APP

I am getting the output in my laptop,it just blinking for a second..

If I connect my display, and then I execute as you told,then can I get the result in my display?

jsulm

@Asha said in cross compiled qt for BBB:

If I connect my display, and then I execute as you told,then can I get the result in my display?

If nothing else is wrong then yes

Asha

@jsulm

Hi,

now i connected my device to the display ,and i followed as you said..
but i am not getting the output in display screen,getting output in my laptop...

jsulm

@Asha said in cross compiled qt for BBB:

getting output in my laptop

Did you redirect the output as @Pablo-J-Rogina suggested before?
If so then do not redirect, just make sure you see graphical desktop on the display.

Asha

@jsulm said in cross compiled qt for BBB:

Did you redirect the output as @Pablo-J-Rogina suggested before?

i am not understand this one,what your trying to ask?

i burned new image in my sdcard,and i put that sdcard into the BBB after that trying to execute this qt applications,

while trying with

ssh debian@192.168.7.2
getting Qxcb error

And trying with

ssh -X debian@192.168.7.2

getting this with displaying the output in laptop

libEGL warning: DRI3: failed to query the version
libEGL warning: DRI2: failed to authenticate
QXcbConnection: XCB error: 1 (BadRequest), sequence: 405, resource id: 220, major code: 154 (Unknown), minor code: 1