Cross-compiling RPi application using Qt Creator

sierdzio

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

Pavel_47

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

Pavel_47

sierdzio

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 Even Raspbian OS (which is veeery outdated) ships Qt 5.7...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

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

Pablo J. Rogina

@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

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

sierdzio

@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

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

@Pavel_47 Ok, I see - OpenGL support

Pavel_47

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

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

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

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

sierdzio

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

@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

@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

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

sierdzio

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

CROSS-COMPILE

Should be CROSS_COMPILE.

Also, on some systems (very rarely) ~/ does not work correctly, in such case use $HOME/ or full path instead.

Pavel_47

Indeed, there was typo.
I corrected and rerun configure. New error:

pyo@AREStest:~/raspi/qt-everywhere-src-5.12.3/qtbase$ ./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
Creating qmake...
make: Nothing to be done for `first'.
Command line: -release -opengl es2 -device linux-rasp-pi3-vc4-g++ -device-option CROSS_COMPILE=/home/pyo/raspi/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-x64/bin/arm-linux-gnueabihf- -sysroot /home/pyo/raspi/sysroot -opensource -confirm-license -make libs -prefix /usr/local/qt5pi -extprefix /home/pyo/raspi/qt5pi -hostprefix /home/pyo/raspi/qt5 -no-use-gold-linker -v

This is the Qt Open Source Edition.

You have already accepted the terms of the Open Source license.

Running configuration tests...

+ /home/pyo/raspi/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-x64/bin/arm-linux-gnueabihf-g++ -dumpmachine
> arm-linux-gnueabihf
Checking for valid makespec... 
+ cd /home/pyo/raspi/qt-everywhere-src-5.12.3/qtbase/config.tests/verifyspec && /home/pyo/raspi/qt-everywhere-src-5.12.3/qtbase/bin/qmake "CONFIG -= qt debug_and_release app_bundle lib_bundle" "CONFIG += shared warn_off console single_arch" "QMAKE_CFLAGS += --sysroot=/home/pyo/raspi/sysroot" "QMAKE_CXXFLAGS += --sysroot=/home/pyo/raspi/sysroot" "QMAKE_LFLAGS += --sysroot=/home/pyo/raspi/sysroot" -early "CONFIG += cross_compile" /home/pyo/raspi/qt-everywhere-src-5.12.3/qtbase/config.tests/verifyspec
+ cd /home/pyo/raspi/qt-everywhere-src-5.12.3/qtbase/config.tests/verifyspec && MAKEFLAGS= /usr/bin/make clean && MAKEFLAGS= /usr/bin/make
> rm -f verifyspec.o
> rm -f *~ core *.core
> /home/pyo/raspi/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-x64/bin/arm-linux-gnueabihf-g++ -c -march=armv8-a -mtune=cortex-a53 -mfpu=crypto-neon-fp-armv8 -mfloat-abi=hard --sysroot=/home/pyo/raspi/sysroot -O2 -std=gnu++11 -w -fPIC  -I. -I/home/pyo/raspi/qt-everywhere-src-5.12.3/qtbase/mkspecs/devices/linux-rasp-pi3-vc4-g++ -o verifyspec.o verifyspec.cpp
> /home/pyo/raspi/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-x64/bin/arm-linux-gnueabihf-g++ -mfloat-abi=hard --sysroot=/home/pyo/raspi/sysroot -Wl,-O1 -Wl,-rpath-link,/home/pyo/raspi/sysroot/usr/lib/arm-linux-gnueabihf -Wl,-rpath-link,/home/pyo/raspi/sysroot/lib/arm-linux-gnueabihf -o verifyspec verifyspec.o      
> /home/pyo/raspi/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-x64/bin/../lib/gcc/arm-linux-gnueabihf/4.8.3/../../../../arm-linux-gnueabihf/bin/ld:/home/pyo/raspi/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-x64/bin/../lib/gcc/arm-linux-gnueabihf/4.8.3/../../../../arm-linux-gnueabihf/lib/libstdc++.so: file format not recognized; treating as linker script
> /home/pyo/raspi/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-x64/bin/../lib/gcc/arm-linux-gnueabihf/4.8.3/../../../../arm-linux-gnueabihf/bin/ld:/home/pyo/raspi/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-x64/bin/../lib/gcc/arm-linux-gnueabihf/4.8.3/../../../../arm-linux-gnueabihf/lib/libstdc++.so:1: syntax error
> collect2: error: ld returned 1 exit status
> make: *** [verifyspec] Error 1
Note: Also available for Linux: linux-clang linux-icc

ERROR: Cannot compile a minimal program. The toolchain or QMakeSpec is broken.