Cross-compiling RPi application using Qt Creator

Pavel_47 · wrote on 28 May 2019, 12:08

For building windows tools, manual specifies the following command:

mkdir qt-build
cd qt-build
../qt-everywhere-opensource-src-5.5.0/configure -platform win32-g++ -xplatform linux-arm-gnueabi-g++ -release -opengl es2 -device linux-rasp-pi2-g++ -sysroot C:/SysGCC/Raspberry/arm-linux-gnueabihf/sysroot -prefix /usr/local/qt5

For RPi3 device I should probably use linux-rasp-pi-g++ instead of linux-rasp-pi2-g++. Correct ?

Pavel_47 · wrote on 28 May 2019, 12:58

Here is the message what I get after executing build command:

The OpenGL ES 2.0 functionality test failed!
 Use of pkg-config is not enabled, maybe you want to pass -force-pkg-config?
 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
 c:/Users/pyo/Downloads/qt-everywhere-opensource-src-5.5.0/qtbase/mkspecs/devices/linux-rasp-pi-g++.

Any ideas ?

sierdzio · wrote on 28 May 2019, 13:07

Device should be linux-rasp-pi3-g++ or if you want EGLFS with full OpenGL support, linux-rasp-pi3-vc4-g++

Pavel_47 · wrote on 28 May 2019, 13:13

With linux-rasp-pi3-g++ I get this:
Error: No device matching 'linux-rasp-pi3-g++'

Pavel_47 · wrote on 28 May 2019, 13:23

sierdzio · wrote on 28 May 2019, 17:05

Oh, Qt 5.5? Yes, that came out before Raspberry Pi 3 was on the market. I strongly recommend compiling a more modern version of Qt. Even Raspbian OS (which is veeery outdated) ships Qt 5.7...

Pavel_47 · 28 May 2019, 17:33

I took source from here:
qt-everywhere-src-5.12.3
Can you provide link with more recent version.
Thanks

Pablo J. Rogina · wrote on 28 May 2019, 17:33

@Pavel_47 that's latest version so far

please be aware that a previous post from you has ../qt-everywhere-opensource-src-5.5.0/configure that's why I think @sierdzio brought that out.

Pavel_47 · 29 May 2019, 12:02

So, what about original problem: what location use in bulding command - linux-rasp-pi-g++ or linux-rasp-pi2-g++ ?

sierdzio · wrote on 29 May 2019, 12:02

@Pavel_47 said in Cross-compiling RPi application using Qt Creator:

So, what about original problem: what location use in bulding command - linux-rasp-pi-g++ or linux-rasp-pi2-g++ ?

All your input so far suggest you are actually compiling Qt 5.5. Please make sure you're working with the 5.12.3 source you downloaded.

Pavel_47 · 29 May 2019, 14:17

Yes !!! Misunderstanding with my colleague - I believed that folder qt-everywhere-opensource-src-5.5.0 corresponds to the latest source of Qt. Indeed there are new device folder that correspond to RPi3: linux-rasp-pi3-g++ and linux-rasp-pi3-vc4-g++. What is the difference between them ?
Thanks.

Pavel_47 · wrote on 29 May 2019, 14:17

@Pavel_47 Ok, I see - OpenGL support

Pavel_47 · wrote on 29 May 2019, 14:27

Error while building !

Preparing build tree...
Creating qmake...
..............................c:/Users/pyo/Downloads/qt-everywhere-src-5.12.3/qtbase/src/corelib/global/qglobal.cpp:
In function 'QString qEnvironmentVariable(const char*, const QString&)':
c:/Users/pyo/Downloads/qt-everywhere-src-5.12.3/qtbase/src/corelib/global/qglobal.cpp:3346:49: error: '_wgetenv_s' was not declared in this scope
     _wgetenv_s(&requiredSize, 0, 0, wname.data());
                                                 ^
make.exe: *** [qglobal.o] Error 1

Pavel_47 · wrote on 29 May 2019, 14:44

Indeed, I've hierarchically searched for _wgetenv_s through whole qt-everywhere-src-5.12.3 (.cpp and .h) and found that it's referenced only in qglobal.cpp ... and declared/defined nowhere.

Pavel_47 · wrote on 29 May 2019, 15:08

On this link the author propose a workaround (although I'm not sure if this workaround is valid for my case).
Anyway I've added this instruction (i.e. defined MINGW_HAS_SECURE_API flag as suggested)
DEFINES += UNICODE _UNICODE WIN32 MINGW_HAS_SECURE_API=1
in ...\win32-g++\qmake.conf
Unfortunately it didn't help

Pavel_47 · wrote on 29 May 2019, 15:44

Well, I reported this issue as bug on
https://bugreports.qt.io/

sierdzio · wrote on 29 May 2019, 18:27

Sounds like something that would not happen on Linux. I have never encountered this error, so I can only wish you luck :D

Pavel_47 · 31 May 2019, 08:18

@Pablo-J.-Rogina said in Cross-compiling RPi application using Qt Creator:

@Pavel_47 you may want to try this guide, in particular the section to setup Qt Creator

Well, having problem with building toolchain under Windows, I decided to switch to Linux.
But in Linux I've also met problem while configuring Qt. Here is the result if executing ./configure:

Project ERROR: Cannot run target compiler 'g++'. Output:
===================
Using built-in specs.
COLLECT_GCC=g++
g++: error: unrecognized command line option '-mfpu=crypto-neon-fp-armv8'
g++: error: unrecognized command line option '-mfloat-abi=hard'
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 4.8.4-2ubuntu1~14.04.3' --with-bugurl=file:///usr/share/doc/gcc-4.8/README.Bugs --enable-languages=c,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-4.8 --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.8 --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-gnu-unique-object --disable-libmudflap --enable-plugin --with-system-zlib --disable-browser-plugin --enable-java-awt=gtk --enable-gtk-cairo --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-4.8-amd64/jre --enable-java-home --with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-4.8-amd64 --with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-4.8-amd64 --with-arch-directory=amd64 --with-ecj-jar=/usr/share/java/eclipse-ecj.jar --enable-objc-gc --enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --with-tune=generic --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 4.8.4 (Ubuntu 4.8.4-2ubuntu1~14.04.3) 
===================
Maybe you forgot to setup the environment?

sierdzio · wrote on 31 May 2019, 08:18

@Pavel_47 said in Cross-compiling RPi application using Qt Creator:

gcc version 4.8.4

Ancient stuff... I hope RPi will update their toolchain finally some day.

--target=x86_64-linux-gnu

Looks like you are not building for ARM. Either wrong toolchain or wrong ./configure flags.

Pavel_47 · 31 May 2019, 08:37

Here is configure I've just used:

./configure -release -opengl es2 -device linux-rasp-pi3-vc4-g++ -device-option CROSS-COMPILE=~/raspi/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-x64/bin/arm-linux-gnueabihf -sysroot ~/raspi/sysroot -opensource -confirm-license -make libs -prefix /usr/local/qt5pi -extprefix ~/raspi/qt5pi -hostprefix ~/raspi/qt5 -no-use-gold-linker -v