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README.md
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README.md
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# Qt_Raspberry_Toolchain
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Toolchain to build Qt Apps on a host system (like a X86 Desktop) and deploy it on a Raspberry Pi.
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Uses custom Qt and cross compiler.
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This is a simplified and scripted version of: https://www.kampis-elektroecke.de/raspberry-pi/qt/
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Read this if you using a different Raspberry as the Model B 2 or need X11 support.
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## Requirements
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Raspberry Pi with up-to-date GNU/Linux
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SSH Connection to host system
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## Install
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### Setup Raspberry Pi
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```
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apt-get build-dep qt5-qmake
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apt-get build-dep libqt5gui5
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apt-get build-dep libqt5webengine-data
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apt-get build-dep libqt5webkit5
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apt-get install libudev-dev libinput-dev libts-dev libxcb-xinerama0-dev libxcb-xinerama0 gdbserver
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```
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Default Qt installation path is: "/usr/local/RaspberryQt"
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```
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chown -R pi:pi /usr/local/RaspberryQt
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ln -s /opt/vc/lib/libEGL.so /usr/lib/arm-linux-gnueabihf/libEGL.so.1.0.0
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ln -s /opt/vc/lib/libGLESv2.so /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0
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ln -s /opt/vc/lib/libEGL.so /opt/vc/lib/libEGL.so.1
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ln -s /opt/vc/lib/libGLESv2.so /opt/vc/lib/libGLESv2.so.2
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```
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### Setup host system
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```
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apt install libjasper-dev
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apt-get install -y git cmake build-essential pkg-config libjpeg-dev libtiff5-dev libpng-dev libavcodec-dev libavformat-dev libswscale-dev libv4l-dev libxvidcore-dev libx264-dev libatlas-base-dev gfortran wget unzip libz-dev zlib1g-dev gcc g++ git bison python gperf gdb-multiarch qt5-default texinfo make python3-dev
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```
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Create new SSH-Key for passwordless remote login
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```
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ssh-keygen -t rsa -C root@192.168.0.40 -P "" -f ~/.ssh/rpi_root_id_rsa
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cat ~/.ssh/rpi_root_id_rsa.pub | ssh root@192.168.0.40 'cat >> .ssh/authorized_keys && chmod 640 .ssh/authorized_keys'
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```
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run script to resolve requirements
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```
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bash install_host.sh
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```
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copy sysroot to host
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```
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rsync -avz -e "ssh -p22 -i ~/.ssh/rpi_root_id_rsa" root@192.168.0.40:/lib sysroot
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rsync -avz -e "ssh -p22 -i ~/.ssh/rpi_root_id_rsa" root@192.168.0.40:/usr/include sysroot/usr
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rsync -avz -e "ssh -p22 -i ~/.ssh/rpi_root_id_rsa" root@192.168.0.40:/usr/lib sysroot/usr
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rsync -avz -e "ssh -p22 -i ~/.ssh/rpi_root_id_rsa" root@192.168.0.40:/opt/vc sysroot/opt
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```
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Fix symbolic links
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```
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python /opt/RaspberryQt/sysroot-relativelinks.py sysroot
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```
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Build Qt
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```
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cd build
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../qt_src/configure -device linux-rasp-pi2-g++ -device-option CROSS_COMPILE=.../tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-x64/bin/arm-linux-gnueabihf- -sysroot ../sysroot -prefix /usr/local/RaspberryQt -opensource -confirm-license -no-gbm -skip qtscript -nomake tests -nomake examples -make libs -pkg-config -no-use-gold-linker -v
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make -j12
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make install
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cd ..
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```
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copy Qt to Raspberry Pi
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```
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rsync -avz -e "ssh -p22 -i ~/.ssh/rpi_root_id_rsa" sysroot/usr/local/RaspberryQt root@192.168.0.40:/usr/local
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```
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Fix fonts
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```
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mkdir /usr/local/RaspberryQt/lib/fonts
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cp /usr/share/fonts/truetype/dejavu/* /usr/local/RaspberryQt/lib/fonts
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```
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## Demo
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open demo/untitled/untitled.pro with Qt Creator on host
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For setting up the Qt Creator for remote deployment, see: https://www.kampis-elektroecke.de/raspberry-pi/qt/
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