This blog post will demonstrate how to cross compile Qt4 applications for the Raspberry Pi (RPi). The approach taken in this entry is a little different from that taken by other tutorials such as. Bomberman game download for pc. The complete cross compilation of the Qt4 or Qt5 libraries will NOT be covered.

Qt's meta-object system provides the signals and slots mechanism for inter-object communication, run-time type information, and the dynamic property system. The meta-object system is based on three things: The QObject class provides a base class for objects that can take advantage of the meta-object. The Meta-Object Compiler, moc, is the program that handles Qt's C++ extensions. The moc tool reads a C++ header file. If it finds one or more class declarations that contain the Q_OBJECT macro, it produces a C++ source file containing the meta-object code for those classes.

Instead, the Qt4 libraries available in the Raspbian's repos will be installed on the Raspberry Pi and the RPi's root filesystem will then be mounted onto the PC over the network using SSHFS. The RPi's cross compiling toolchain will then build qt apps by compiling Qt4 source code on the PC and linking it to the Qt4 libraries available via the SSHFS-mounted RPi filesystem. Simple QT4 application cross-compiled on PC The challenge with such an approach is the inability to use either the native qmake on the PC or the RPi. Both were built to be used natively on their respective platforms. While cross-compiling qmake and customizing it may be possible, the approach presented here will circumvent qmake altogether. Instead, a custom makefile will be used to successfully cross-compile Qt4 applications.

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My username on my Linux PC is 'halherta' and by RPI's IP address is '192.168.0.104'. Please replace these with your appropriate username and RPI IP address as per your setup.

Bring up the RPi with Raspbian OS: First we need to boot Raspbian on the Raspberry Pi. If you don't already have Raspbian running on the RPi or need to do a clean install of Raspbian OS on the RPi, do the following: • Install the Raspbian OS on an SD Card (4GB should be OK but 8GB is better) • Plug the SD Card into the Raspberry Pi • Connect the Raspberry Pi to the Network and power it • SSH into the RPi. • Configure the RPi using the raspi-config utility • Reboot and SSH again onto the RPi • The first six steps listed above are covered in detail • Update all packages on the RPi with: sudo apt-get update && sudo apt-get dist-upgrade • While still logged in to the RPi over SSH, install the Qt4 libraries on the Raspberry Pi from the Raspbian repos: sudo apt-get install libqt4-dev Install The RPi's cross compiling Toolchain on your Linux PC To install the RPi's cross compiling toolchain on your Linux (Ubuntu-based/Debian-based distro) PC: • Create a $HOME/rpi directory on your Linux PC. Download the cross-compiling toolchain for the RPi into that directory on your Linux PC and add it’s bin directory to the PATH variable in your.bashrc as instructed.