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

[SGaist]

What is the exact error message ?

[pli_in_sweden]

@SGaist hi
the problem is solved. It is just that the libstdc++ on BBB has a different version from the one on my host pc. I simply copy the correct one to BBB and link to it.

But now has another problem. It said it can not find platform plugin "eglfs" in "". And different from what I google, people who has this error has one more message of "The available platform is :......" . But my error doesn't list the available platform. Does it mean that I don't have any platform that can be used?

I looked at the path/to/QT/plugins/platforms/, and there is no something related to eglfs, only libqlinuxfb.so

when configuring the qt, I have the argument ./configure -qt-xcb.

What should I ?

Thanks

[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.