Problem with executing cross-compiled QT application in beaglebone, libstdc++.so.6 correct version not found

[SGaist]

Well, configure for eglfs then. Pass -qt-xcb means that you are building the xcb backend which requires an Xorg server running on your device.

[pli_in_sweden]

@SGaist hi

I first try 'sudo apt-get install libgles2-mesa-dev libgles2-mesa'.

then I try to reconfigiure with after confclean:

...(the same as previous post).. -no-xcb -opengl es2 -eglfs

But I get the error that said openGL test failed, and 'the eglfs was enabled´, but the pre-condition feature.egl failed'

I realized that it could not find the libglesv2.so. But the thing is, I don't even have libglesv2.so in my sysroot/usr/lib!!

I download the sysroot from https://releases.linaro.org/components/toolchain/binaries/latest/arm-linux-gnueabihf/

How can I get a libglesv2.so?

Or is there any other sysroot that I can use for QT5.8?

Bests

[SGaist]

Usually the constructor of your device provides the necessary hooks in order to access the GPU on their hardware.

[pli_in_sweden]

@SGaist hi

Ok. So on BBB I found the libqeglfs.so in /usr/lib/arm-linux-guneabihf/qt5/plugins/platforms/. What exactly should I do then?

I guess instead of using the sysroot from linaro website. I mount the / of BBB to my host PC and use that as a sysroot when doing the configuration.

Let's say I mount the / to /mnt/bbb of my host

sudo sshfs debian@192.168.7.2:/ /mnt/BBB

Is it correct then to to modify the qmake.conf

QMAKE_INCDIR_EGL = /mnt/BBB/usr/include
QMAKE_LIBDIR_EGL = /mnt/BBB/usr/lib

save qmake.conf.

Then run configure as :

./configure -platform linux-g++ -xplatform linux-arm-gnueabi-g++ -release -device linux-beagleboard-g++ -sysroot /mnt/BBB -prefix /opt/Qt5.8-arm/ -device-option CROSS_COMPILE=/opt/pliARMtoolchain/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf/bin/arm-linux-gnueabihf- -nomake tests -nomake examples -no-xcb -opengl es2 -eglfs

then it gies en error:

The OpenGL ES 2.0 functionality test failed!
You might need to modify the include and library search paths by editing
QMAKE_INCDIR_OPENGL_ES2, QMAKE_LIBDIR_OPENGL_ES2 and QMAKE_LIBS_OPENGL_ES2 in
/home/pli/Downloads/qt-everywhere-opensource-src-5.7.0/qtbase/mkspecs/linux-g++.

I can find the libGLESv2.so in /mnt/BBB/usr/lib/arm-linux-gnueabihf/. And I already 'sudo apt-get install libgles2-mesa-dev libgles2-mesa', so please guide me how I should find the OPEN GL es2 header and library, from sysroot or from the host?

Thanks!

[SGaist]

You should use the verbose mode to get the exact error matching the functionality test for OpenGL ES 2.0.

[pli_in_sweden]

@SGaist said in Problem with executing cross-compiled QT application in beaglebone, libstdc++.so.6 correct version not found:

You should use the verbose mode to get the exact error matching the functionality test for OpenGL ES 2.0.

hi

here is the result

I have been searching the headers, but on BBBI only found /usr/include/GL/gl.h, not gl2.h!

THe BBB image is Debian 8.7 2017-03-19 4GB SD LXQT which is available on beaglebone.org.

I have tried to use the SGX driver by following the instruction here http://elinux.org/BeagleBoardDebian#Debian_8_.28jessie.29 (SGX section)

After that I have the libGLESv2.so, but I don't have the headers!

Best
/Peilang

[pli_in_sweden]

@pli_in_sweden

THe problem is solved by installing libgles-mesa-dev, then I got the folder of GLES2.

ANd finally the ./configure work very well witout error.

But then there is error when doing make:

I used to use toolchain and sysroot from linaro website. And there is no make error.But that is because the sysroot from linaro doesn't support opengl es2, and that is why I mount the BBB as sysroot instead. And now the configuration with -opengl es2 work, but during make there seems to be some conflict.

/Peilang

[SGaist]

Can you give more details about the conflicts ?

[pli_in_sweden]

@SGaist hi

I uploaded the pictures but seems it is not loaded.

But anyway, the problem is caused by the toolchain that I used, which has a version of 6.3.1. While the BBB has a gcc version of 4.9. So I download the toolchain with gcc4.9 and I success the run make without error.

However, when I try to run the application on the BBB and show it on a touch screen, there is the error:
"
EGL error: could not create the egl surface : error = 0x300b
Aborted
"

But if I unset the LD_LIBRARY_PATH, the application can run, and show in the display. But then it wouldn't find the lib from QT.

I guess it is needed to set LD_LIBRARY_PATH, and thus I need to fix the error above.

Any clue?

And thanks again for the guide, you are very helpful and save me a lot of time on blindly goolging.

/Peilang

[SGaist]

The upload feature is currently broken. See here for a guide on how to share an image.

IIRC, you have a Mali GPU on that device, did you check that you have the matching libraries installed ?

[pli_in_sweden]

@SGaist said in Problem with executing cross-compiled QT application in beaglebone, libstdc++.so.6 correct version not found:

Mali GPU

hi

Can you give more detail on how I can check the library for Mali? I don't know anything about Mali...

Here is the output of ldd comamnd when LD_LIBRARY_PATH is EXPORTED (the app can NOT run because of the EGL error):

Here is the output of ldd comamnd when LD_LIBRARY_PATH is UNSET (the app can run WITHOUT the EGL error):

But what library am I looking at? Thanks.

This is how it looks with the EGL error:

(Is it because I have not fixed the first two warning yet?)

I also have a second question, I found out that I need to put my source files (.cpp .h and .pro) inside the /qtbase/example on my host PC in order to build and run the app without the EGL error (of cause this is when LD_LIBRARY_PATH is unset). And also need to add:

target.path = $$[QT_INSTALL_EXAMPLES]/mySource/
INSTALLS += target

in the .pro file.

If I put my source file elsewhere outside the /qtbase/examples/, I can build, but the app will have the EGL error.

The output from "qmake -query QT_INSTALL_EXAMPLES" is:
/home/pli/BBB/home/debian/Qt5.8-arm/examples

(/home/pli/BBB is where I mount the BBB via sshfs)

I don't find the 'examples' folder under Qt5.8-arm.

So I have no idea what is wrong here that I have to build the code inside the /qtbase/examples.

Thanks.