Cross-Compile QT 5.12.5 / Raspberry Pi 4 – Marc Wapelhorst
[on RPi] Install a bunch of development files (for simplicity we use build-dep, not everything is really needed, but it is easier this way). [on host] Create a sysroot. Using rsync we can properly keep things synchronized in the future as well. [on host] A
wapel.de
Running Raspbian Buster on Raspberry Pi 4:
[on RPi] Install a bunch of development files (for simplicity we use build-dep, not everything is really needed, but it is easier this way).
Edit sources list in /etc/apt/sources.list and uncomment the deb-src line:
sudo nano /etc/apt/sources.list
Update your system and install required libraries:
sudo apt-get update sudo apt-get build-dep qt4-x11
sudo apt-get build-dep qtbase-opensource-src
sudo apt-get install libegl1-mesa libegl1-mesa-dev libgles2-mesa libgles2-mesa-dev
Optional depending on your project:
sudo apt-get install wiringpi libnfc-bin libnfc-dev fonts-texgyre libts-dev
Optional depending if you want to use QtMultimedia:
sudo apt-get install libbluetooth-dev bluez-tools gstreamer1.0-plugins* libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev libopenal-data libsndio7.0 libopenal1 libopenal-dev pulseaudio
[on RPi] Add pi user to render group
sudo gpasswd -a pi render
[on RPi] Prepare our target directory
sudo mkdir /usr/local/qt5pi
sudo chown pi:pi /usr/local/qt5pi
[on host] Create our working directory and get a toolchain:
mkdir ~/raspi
cd ~/raspi
git clone https://github.com/raspberrypi/tools
[on host] Create a sysroot. Using rsync we can properly keep things synchronized in the future as well.
mkdir sysroot sysroot/usr
rsync -avz pi@yourpi:/lib sysroot
rsync -avz pi@yourpi:/usr/include sysroot/usr
rsync -avz pi@yourpi:/usr/lib sysroot/usr
[on host] Adjust symlinks to be relative. Use provided script, because the old fixQualifiedLibraryPaths is not working properly:
wget https://raw.githubusercontent.com/riscv/riscv-poky/master/scripts/sysroot-relativelinks.py
chmod +x sysroot-relativelinks.py ./sysroot-relativelinks.py sysroot
[on host] Get QT (start with qtbase first)
git clone git://code.qt.io/qt/qtbase.git -b 5.12.5 cd qtbase
[on host] Compile, make, make install
./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
make -j4 make install
If you failed build –>
git clean -dfx
[on host] Deploy Qt to the device. We simply sync everything from ~/raspi/qt5pi to the prefix we configured above.
rsync -avz qt5pi pi@yourpi:/usr/local
[on RPi] Update the device to let the linker find the Qt libs:
echo /usr/local/qt5pi/lib | sudo tee /etc/ld.so.conf.d/qt5pi.conf
sudo ldconfig
[on host] Build other Qt modules as desired, the steps are always the same:
git clone git://code.qt.io/qt/<qt-module>.git -b <qt-version>
cd <qt-module>
~/raspi/qt5/bin/qmake
make
make install
My Modules:
- qtbase
- qtxmlpatterns
- qtsvg
- qtdeclarative
- qtimageformats
- qtgraphicaleffects
- qtquickcontrols
- qtquickcontrols2
- qtvirtualkeyboard
- qtwebsockets
- qtwebglplugin
- qtcharts
- qtconnectivity
- qtmultimedia
- qtlocation
Then deploy new files by running:
rsync -avz qt5pi pi@yourpi:/usr/local
Set physical Display size in mm:
sudo nano ~/.profile
# physical display properties
export QT_QPA_EGLFS_PHYSICAL_WIDTH=211
export QT_QPA_EGLFS_PHYSICAL_HEIGHT=127
source .profile
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