Create embedded QT Gui applications for a Bananapi-M2-Zero

SGaist

Just because the guide mentions 5.5.1, you shouldn't just go blindly with it. Use a recent version of Qt. This one is not supported anymore.

lo38230

I downloaded from

https://ftp.osuosl.org/pub/blfs/conglomeration/qt5/

the package

qt-everywhere-src-5.14.2

containing a configure executable

I copied
/qtbase/mkspecs/linux-arm-gnueabi-g++/
to
/qtbase/mkspecs/linux-arm-gnueabihf-g++/
according to my architecture, and adapted qmake.conf wihth armgnueabi->armgnueabihf
The command line:
./configure -release -opensource -xplatform linux-arm-gnueabihf-g++ -prefix /opt/qt5-arm -no-opengl
x11 option removed because not supported.
At the end of the long make there is an error
libz.so.1, required by /home/eric/qt-everywhere-src-5.14.2/qtbase/lib/libQt5Gui.so not found. I have it on my computer at several places:
/usr/lib/i386-linux-gnu/libz.so.1
/usr/lib/x86_64-linux-gnu/libz.so.1
/usr/lib32/libz.so.1
How do I specify wich to use?
Is it in the command line? in qmake.conf? in path? perform a ln -s?

SGaist

It should be available from your device sysroot.

lo38230

I solved this problem by adding
QMAKE_LIBS += -lz
in my qmake.conf.

But now I have :
sh: 1: python: not found
Project ERROR: Building QtQml requires Python.
make: *** [Makefile:340: module-qtdeclarative-make_first] Error 3

python is already installed on my computer.

SGaist

Which version of Python ?

lo38230

python3 -V

gives

Python 3.8.2

...

ok solved by

sudo ln -s python3 python

in /usr/bin

...

next error is:
Project ERROR: Unknown module(s) in QT: openglextensions
make[2]: *** [Makefile:96: sub-render-make_first-ordered] Error 3

SGaist

QtQuick requires OpenGL but you disabled it.

lo38230

Make for QT 5 arm successful
Make install successful

I create a new basic application Qt 5.14.2 Widgets. Ok With default kit.

When I select arm-linux-gnueabihf I have some compile errors:

/opt/qt5-arm/include/QtCore/qbasicatomic.h:61:4: error: #error "Qt requires C++11 support"

/opt/qt5-arm/include/QtCore/qbasicatomic.h:97:23: error: ‘QAtomicOpsSupport’ was not declared in this scope

/opt/qt5-arm/include/QtCore/qbasicatomic.h:99:14: error: ‘Ops’ has not been declared

/opt/qt5-arm/include/QtCore/qbasicatomic.h:238:13: error: ‘QAtomicOps’ does not name a type

/opt/qt5-arm/include/QtCore/qbasicatomic.h:97:51: error: ‘::IsSupported’ has not been declared

SGaist

Did you properly create a kit using your cross-compiled Qt ?

lo38230

Yes , I added my cross compiled(I remember I had to remove the -no-c++11 of ./configure command because it was not recognized) QT Version Qt 5.14.2(qt5-arm) /opt/qt5-arm/bin/qmake in Qc Kits and it is accepted.
I added the compilers with the package you give me:
gcc Linaro
/home/eric/gcc-linaro-arm-linux-gnueabihf-4.9-2014.07_linux/bin/arm-linux-gnueabihf-gcc
g++ Linaro
/home/eric/gcc-linaro-arm-linux-gnueabihf-4.9-2014.07_linux/bin/arm-linux-gnueabihf-g++
I could not add the debugger arm-Debugger from your package
/home/eric/gcc-linaro-arm-linux-gnueabihf-4.9-2014.07_linux/bin/arm-linux-gnueabihf-gdb
It is not recognized by Qc. I selected GDB multiarch(/usr/bin/gdb-multiarch) which I already have.

Perhaps I should have version 5.14 of compilers and debugger?

As device I have generic Linux device, Qt mkspec is empty.
How should I configure the separated device BananaPi M2 Zero connected trough Ethernet with address 192.168.1.110 to my development PC with Ubuntu Linux? Should I create something else as generic Linux Device?

...

Problem solved by selecting most recent compilers.