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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the documentation of the Qt Toolkit.
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** No Commercial Usage
** This file contains pre-release code and may not be distributed.
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** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
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** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
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** $QT_END_LICENSE$
**
****************************************************************************/
/*!
\page platform-notes-vxworks.html
\title Platform Notes - VxWorks
\contentspage Platform Notes
\target VxWorks
\note VxWorks is a community supported platform. See the
\l{Supported Platforms} page for more information.
This page contains information about the Qt for VxWorks port. More
information about the combinations of platforms and compilers supported
by Qt can be found on the \l{Supported Platforms} page.
\tableofcontents
\section1 Supported Versions
Qt has been tested on WindRiver VxWorks 6.7 in kernel mode using the
vendor supplied GCC compiler, targetting both the x86 simulator
(simpentium) and Power-PC devices (ppc).
VxWorks' RTP mode is currently not supported.
\section1 Limitations
The VxWorks kernel has an optional POSIX compatibility layer, but this
layer does not implement all POSIX functionality needed for a complete
Qt port.
\table
\header \o Function \o Notes
\row \o QProcess
\o Not available - VxWorks has no concept of processes.
\row \o QSharedMemory
\o Not available - VxWorks has only a global, flat address space.
\row \o QSystemSemaphore
\o Not available - VxWorks has no concept of processes.
\row \o QLibrary
\o QLibrary is only a small stub to make it possible to build
static plugins.
\row \o QCoreApplication
\o Can only be instantiated once. Qt's Q(CoreE)Application is
tightly coupled to one address space and process, while VxWorks
only supports one global address space and has no concept of
processes.
\row \o Phonon
\o There is no standard audio backend, which could be integrated into Phonon.
\row \o Qt3Support
\o The Qt3Support library is not available on VxWorks.
\endtable
\section1 Build Instructions
Qt for VxWorks needs to be \l{Cross-Compiling Qt for Embedded Linux
Applications}{cross-compiled} on a Linux host. \c configure and \c make
the build like you would with a standard \l{Cross-Compiling Qt for
Embedded Linux Applications}{embedded Linux cross build}. Building the
VxWorks simulator would be done like this:
\code
<path/to/qt/sources>/configure -xplatform unsupported/vxworks-simpentium-g++ -embedded vxworks -exceptions -no-gfx-linuxfb -no-mouse-linuxtp -no-mouse-pc -no-kbd-tty
make
\endcode
\list
\o \c{-xplatform unsupported/qws/vxworks-simpentium-g++} - selects the x86 simulator mkspec for VxWorks
\o \c{-embedded vxworks} - builds the embedded version of Qt and sets the architecture to VxWorks
\o \c{-exceptions} - see General Notes below
\o \c{-no-gfx-linuxfb}, \c{-no-mouse-linuxtp}, \c{-no-mouse-pc} and \c{-no-kbd-tty} are Linux specific and won't work on VxWorks
\endlist
\section1 General Notes
\list
\o Configuring with \c{-exceptions} is necessary, because the VxWorks
6.7 g++ headers require exceptions to be enabled when compiling C++
code.
\o Configure's \c{-xplatform} can be any of
\c{unsupported/vxworks-(simpentium|ppc)-(g++|dcc)}, but \c{dcc}
(WindRiver DIAB compiler) has not yet tested been tested with Qt 4.6 and
VxWorks 6.7.
\o Building shared libraries with \c{-shared} (the default) doesn't
really build shared libraries, like e.g. on Linux, since these are not
supported by VxWorks. Instead, qmake will created partially linked
objects, that can be loaded at runtime with \c{ld}.
\o Creating static builds with \c{-static} is fully supported.
\o "Munching" (generating constructors/destructors for static C++
objects) is done automatically by a special qmake extension (for both
shared libraries and executables)
\o VxWorks does not have a file system layer, but the low level storage
drivers have to supply a file system like interface to the applications.
Since each driver implements a different subset of the functionality
supported by this interface, Qt's file system auto-tests show wildly
differing results running on different "file systems". The best results
can be achieved when running on a (writable) NFS mount, since that
provides the most Unix-ish interface. The worst results come from the
FTP file system driver, which may crash when accessed by a
\c{QFileInfo}.
\o Keep in mind that VxWorks doesn't call your \c{main()} function with
the standard \c{argc}/\c{argv} parameters. So either add a special
\c{vxmain()} function or use a tool like \c{callmain} to translate
VxWorks' commandline arguments to an \c{argc}/\c{argv} array.
\o Some example will fail to build, due to some missing dependencies
(e.g. shared memory) - this will be fixed in a later release.
\endlist
*/
/*!
\page platform-notes-qnx.html
\title Platform Notes - QNX
\contentspage Platform Notes
\target QNX
\note QNX is a community supported platform. See the
\l{Supported Platforms} page for more information.
This page contains information about the Qt for QNX port. More
information about the combinations of platforms and compilers supported
by Qt can be found on the \l{Supported Platforms} page.
Note that Qt for QNX is currently based on \l{Qt for Embedded Linux}, which
contains its own windowing system. Mixing QNX's Photon environment with
Qt for QNX is currently not possible. Building Qt for QNX with Photon's
X11 embedded server is not recommended due to missing support for X11 extensions,
resulting in poor rendering quality.
Qt for QNX contains experimental screen and input drivers based on QNX's
\c devi-hid and \c io-display. For more information, check the class documentation
for QQnxScreen, QWSQnxKeyboardHandler and QQnxMouseHandler. See the
\l{Porting Qt for Embedded Linux to a New Architecture} document for information
on how to add custom screen or input drivers.
\tableofcontents
\section1 Supported Versions
Qt has been tested on QNX 6.4 on i386 and PowerPC targets with QNX's default
gcc compiler.
\section1 Limitations
Some of Qt's functionality is currently not available on QNX:
\table
\header \o Function \o Notes
\row \o QProcess
\o Not available - QNX doesn't support mixing threads and processes.
\row \o QSharedMemory
\o Not available - QNX doesn't support SYSV style shared memory.
\row \o QSystemSemaphore
\o Not available - QNX doesn't support SYSV style system semaphores.
\row \o QWS Multi Process
\o QT_NO_QWS_MULTIPROCESS is always on due to missing shared memory support.
\row \o Phonon
\o There is no standard audio backend, which could be integrated into Phonon.
\row \o Qt3Support
\o The Qt3Support library is not available on QNX.
\endtable
\section1 Build Instructions
Qt for QNX needs to be built either on a QNX system, or \l{Cross-Compiling Qt
for Embedded Linux Applications}{cross-compiled} on a Linux host. In either
case, The QNX Software Development Platform must be installed.
Example configure line for cross-compiling Qt for QNX on a Linux host for an
i386 QNX target:
\code
configure -xplatform unsupported/qws/qnx-i386-g++ -embedded i386 -no-gfx-linuxfb -no-mouse-linuxtp -no-kbd-tty -no-qt3support -qt-gfx-qnx -qt-mouse-qnx -qt-kbd-qnx -no-exceptions
\endcode
\list
\o \c{-xplatform unsupported/qws/qnx-i386-g++} - selects the i386-g++ mkspec for QNX
\o \c{-embedded i386} - builds the embedded version of Qt and sets the architecture to i386
\o \c{-no-gfx-linuxfb}, \c{-no-mouse-linuxtp} and \c{-no-kbd-tty} are Linux specific and won't work on QNX
\o \c{-no-qt3support} - required since the Qt3 support classes are not supported on QNX
\o \c{-no-exceptions} - reduces the size of the library by disabling exception support
\o \c{-qt-gfx-qnx} - enables the experimental \c{io-graphics} based display driver
\o \c{-qt-mouse-qnx} - enables the experimental \c{devi-hig} based mouse driver
\o \c{-qt-kbd-qnx} - enables the experimental \c{devi-hig} based keyboard driver
\endlist
\section1 General Notes
\list
\o To enable the experimental QNX display and input drivers, \c{io-display} needs to be
up and running. The \c devi-hid based Qt input drivers require \c devi-hid to run
in resource mode without Photon support. To enable a standard mouse and keyboard
combination, run \c devi-hid as follows: \c{/usr/photon/bin/devi-hid -Pr kbd mouse}.
Note that your current shell will not accept keyboard and mouse input anymore after
running that command, so run it either from a script that launches a Qt application
afterwards, or make sure to have remote login available to launch a Qt application.
In addition, the \c QWS_DISPLAY, \c QWS_MOUSE_PROTO and \c QWS_KEYBOARD environment
variables should all be set to \c{qnx} before running a Qt application.
\o The 3rd party TIFF library currently doesn't build due to the missing \c inflateSync
symbol from QNX's \c{libz.so.2}. Workarounds would be to manually replace QNX's libz
with a newer version, or disable the TIFF plugin entierly by appending
\c{QT_CONFIG += no-tiff} to \c{.qmake.cache} after configuring Qt.
\o Some of the tools, examples and demos do not compile due to dependencies on QProcess
or other classes that are not available on QNX.
\endlist
\section1 Platform Regressions
Qt for QNX's behavior is mostly identical with \l{Qt for Embedded Linux}. However,
some regressions were spotted in QDateTime computation around year 0 and year 1970,
which have been tracked back to faulty time zone data on some QNX versions.
*/
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