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Cross-Compiling Applications

Cross-compiling is the process of executing a compile on one machine, producing object/executable code for a different machine or device.

Step 1: Setting the Cross-Compiler's Path
Step 2: Including the Required Libraries
Step 3: Creating a Target Specific qmake Specification
Step 4: Providing Mouse and Keyboard Drivers
Step 5: Building the Target Specific Executable

Step 1: Setting the Cross-Compiler's Path

Specify the cross compiler by setting the PATH environment variable. For example, if the current shell is bash, ksh, zsh or sh:

    export PATH=path/to/cross/compiler:$PATH

Step 2: Including the Required Libraries

Make sure that all the libraries needed for the application, as well as for the Qt libraries, are present in the tool chain. In particular, if the zlib and jpeg libraries are not available, they must be included by running the configure script with the -L and -I options. For example:

    cd path/to/Qtopia/Core
    ./configure -L /path/to/libjpeg/libraries -I /path/to/libjpeg/headers

The JPEG source can be downloaded from http://www.ijg.org/. The Qtopia Core distribution includes a version of the zlib source that can be compiled into the Qtopia core library. If integrators wish to use a later version of the zlib library, it can be downloaded from the http://www.gzip.org/zlib/ website.

Step 3: Creating a Target Specific qmake Specification

The qmake tool requires a qmake.conf file describing the platform and compiler specific default values used to generate appropriate Makefiles. The standard Qtopia Core distribution provides such files for several combinations of platforms and compilers. These files are located in the mkspecs subdirectory.

Create a qmake.conf fitting your target environment by copying an already existing file. It is recommended to copy the entire directory, for example:

    cp path/to/Qtopia/Core/mkspecs/qws/linux-mips-g++/...
       path/to/Qtopia/Core/mkspecs/qws/linux-myplatform-g++/...

Then customize the new platform specific qmake.conf file.

Step 4: Providing Mouse and Keyboard Drivers

Without the proper mouse and keyboard drivers, you won't be able to give any input to your application when it is installed on the target device.

By default, Qtopia Core provides mouse drivers for the MouseMan, IntelliMouse, Microsoft, NEC Vr41XX, Linux Touch Panel and Yopy protocols as well as the universal touch screen library, tslib. The provided keyboard drivers are SL5000, Yopy, Vr41XX, console (TTY) and USB.

Other drivers can be added by deriving from the QWSMouseHandler and QMouseDriverPlugin classes, or the QWSKeyboardHandler and QKbdDriverPlugin classes, and using Qt's plugin mechanism. See the How to Create Qt Plugins documentation and the Plug & Paint example for details.

Step 5: Building the Target Specific Executable

Before building the executable, run the configure script specifying the platform architecture as well as the platform specific mouse, keyboard and graphics drivers:

    cd path/to/Qtopia/Core
    ./configure -embedded myplatform -qt-kbd-<mykeyboarddriver>
                -qt-mouse-<mymousedriver> -qt-gfx-<mygraphicsdriver>

    cd path/to/myApplication
    qmake -project
    qmake
    make

That's all. Your target specific executable is ready for deployment.

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