Generating an environment on Linux to cross-compile QT applications for a Raspberry Pi running Debian Wheezy:
Grab tools (for the cross-compiler tool chain) and firmware (for the OpenGL libraries) from the Raspberry Pi GitHub repository:
git clone https://github.com/raspberrypi/tools.git --depth=1
git clone https://github.com/raspberrypi/firmware.git --depth=1
Copy OpenGL stuff to the toolchain's sysroot:
cp -a firmware/opt tools/arm-bcm2708/linux-x86/arm-bcm2708-linux-gnueabi/sys-root
Workaround for some EGL include files being in the wrong directory:
cp tools/arm-bcm2708/linux-x86/arm-bcm2708-linux-gnueabi/sys-root/opt/vc/include/interface/vcos/pthreads/* tools/arm-bcm2708/linux-x86/arm-bcm2708-linux-gnueabi/sys-root/opt/vc/include/interface/vcos
Grab Qt:
git clone https://git.gitorious.org/qt/qt5.git qt5 --depth=1
cd qt5
./init-repository --no-webkit
Configure and compile:
./configure -prefix /opt/qt50-snapshot -hostprefix $PWD/../qmake_for_pi \
-release -device linux-rasp-pi-g++ -device-option \
CROSS_COMPILE=$PWD/../tools/arm-bcm2708/linux-x86/bin/arm-bcm2708-linux-gnueabi-
-sysroot \
$PWD/../tools/arm-bcm2708/linux-x86/arm-bcm2708-linux-gnueabi/sys-root \
-device-option DISTRO=wheezy -opensource -confirm-license -nomake \
examples -nomake tests -optimized-qmake -reduce-relocations -reduce-exports
Build the binaries:
./build -j$(nproc)
Copy mkspecs folder to the sysroot. Qt Creator 2.5 expects them to be there, and will throw a "The default mkspec symlink is broken" error otherwise:
cd ..
cp -a qmake_for_pi/mkspecs tools/arm-bcm2708/linux-x86/arm-bcm2708-linux-gnueabi/sys-root/opt/qt50-snapshot
To cross-compile applications:
in Qt Creator 2.5, go to menu "tools" -> "options" -> "Build & Run"
Tab "toolchains" add:
/YOURFOLDER/tools/arm-bcm2708/linux-x86/bin/arm-bcm2708-linux-gnueabi-gcc
Tab "Qt versions" add: /YOURFOLDER/qmake_for_pi/bin/qmake
Under "Linux "devices" add the SSH login details of your Pi and specify the remote folder on the Pi your application should be uploaded to in your projects' .pro file, like this:
target.path = /tmp
INSTALLS += target