Port of Qt to QNX

This makes Qt work on QNX 6.4.
 * no q3support, no phonon
 * no QSharedMemory, no QSystemSemaphore, no QProcess

Reviewed-By: Robert Griebl

2 files changed, 99 insertions, 6 deletions

diff --git a/doc/src/platform-notes-rtos.qdoc b/doc/src/platform-notes-rtos.qdoc
index d2895d8..8a52d84 100644
--- a/doc/src/platform-notes-rtos.qdoc
+++ b/doc/src/platform-notes-rtos.qdoc
@@ -18,6 +18,7 @@
     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
 
@@ -26,21 +27,25 @@
     Qt port.
 
     \table
-    \header \o Class \o Notes
+    \header \o Function \o Notes
     \row \o QProcess
-         \o Not available - VxWorks has no concept of processes
+         \o Not available - VxWorks has no concept of processes.
     \row \o QSharedMemory
-         \o Not available - VxWorks has only a global, flat address space
+         \o Not available - VxWorks has only a global, flat address space.
     \row \o QSystemSemaphore
-         \o Not available - VxWorks has no concept of processes
+         \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
+            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 QNX.
 
     \endtable
 
@@ -122,6 +127,94 @@
     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.
 */
diff --git a/doc/src/platform-notes.qdoc b/doc/src/platform-notes.qdoc
index 4807f8f..7c97f65 100644
--- a/doc/src/platform-notes.qdoc
+++ b/doc/src/platform-notes.qdoc
@@ -378,7 +378,7 @@
     improve support for this feature.
 */
 
-    \row    \o QNX               \o Intel 32-bit, PowerPC   \o unsupported/qnx-<arch>-g++       \o QNX 6.4 GCC
+    \row    \o \l{QNX}           \o Intel 32-bit, PowerPC   \o unsupported/qnx-<arch>-g++       \o QNX 6.4 GCC
     \row    \o VxWorks           \o Intel 32-bit, PowerPC   \o unsupported/vxworks-<arch>-g++   \o VxWorks 6.7 GCC
 
 /*!