Kontron KTAM3874-pITX - Manual (Page 174)

KTD-S0057-I Page 170 Linux® Programming Examples (DebianTM)
KTAM3874/pITX Software Guide
10.12.4 Qt TM 4.8
Qt TM is a cross-platform environment and UI framework with native C++ libraries, declarative UI language
and tools in order to build complex applications for desktop, embedded and mobile computers. On an x86
Desktop PC using a cross compiler (Ubuntu
TM environment) you need some additional libraries (application
dependent):
QtCore
QtGui
QtDBus
glib-2.0
png12
expat
pcre
uuid
z (libz)
Some Qt TM dynamic libraries are available within the standard Debian TM image (have a look at the di-
rectories /usr/lib/arm-linux-gnueabihf and /lib/arm-linux-gnueabihf ), especially these five libraries:
QtCore.so.4.8.2, QtGui.so.4.8.2, QtDBus.so.4.8.2, QtCLucene.so.4.8.2 and QtXml.so.4.8.2. The best way
for development consists in the use of these libraries which should be copied from the target hardware to
the cross compiler environment. Maybe a link creation or renaming of library files could be required. You
also need some additional Include-files which typically are not available. For smaller applications the
download of
libqt4-dev on the x86 Desktop PC offers a sufficient way with
sudo apt-get install libqt4-dev
Now you have access to the new Include parent directory /usr/include/qt4 and also to the important new
base directory /usr/share/qt4 . The following examples will not need the Qt TM Creator or qmake, therefore a
small manual adjustment is necessary. After the download of libqt4-dev the development environment uses
x86 settings. By switching two definitions in the file
/usr/include/qt4/QtCore/qconfig.h
Qt TM compiles for ARM environment and creates an ARM executable (changes in orange color):
/* Everything */
/* Qt Edition */
#ifndef QT_EDITION
# define QT_EDITION QT_EDITION_OPENSOURCE
#endif
/* Machine byte-order */
#define Q_BIG_ENDIAN 4321
#define Q_LITTLE_ENDIAN 1234
/*#define QT_BUILD_KEY "i386 linux g++-4 full-config"*/
/*#define QT_BUILD_KEY_COMPAT "i686 Linux g++-4 full-config"*/
#define QT_BUILD_KEY "arm linux g++-4 full-config"
#ifdef QT_BOOTSTRAPPED
#define Q_BYTE_ORDER Q_LITTLE_ENDIAN
#else
#define Q_BYTE_ORDER Q_LITTLE_ENDIAN
#endif