Kontron KTAM3874-pITX Manual de usuario descargar pdf (Pagina 174)

KTD-S0057-I Page 170 Linux® Programming Examples (DebianTM)

KTAM3874/pITX Software Guide

10.12.4 Qt

4.8

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

environment) you need some additional libraries (application

dependent):

QtCore

QtGui

QtDBus

glib-2.0

png12

expat

pcre

uuid

z (libz)

Some Qt

dynamic libraries are available within the standard Debian

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

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

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

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