Disable QtConcurrent for Symbian winscw builds.

While QtConcurrent is nowadays usable with RVCT and GCCE compilers,
the compiler used for the winscw target has problems with the
templates still. To enable building 4.8 on winscw, the patch
defines QT_NO_CONCURRENT and QT_NO_QFUTURE in qglobal.h for
this target. However this causes further complications in the
Q_OBJECT classes of QtConcurrent because moc will be run without
having QT_NO_CONCURRENT and QFUTURE defined (as moc is not a Symbian
app and for other Symbian targets they must not be defined, which makes
differentiation in qglobal.h impossible for the moc run) and having a
moc file generated for a class that will be ifdef'ed out during
compilation causes build breaks. Therefore additional dummy stubs are
provided in QFutureWatcherBase.

Reviewed-by: Liang Qi

3 files changed, 32 insertions, 5 deletions

diff --git a/src/corelib/concurrent/qfuturewatcher.cpp b/src/corelib/concurrent/qfuturewatcher.cpp
index ea12bc9..728714a 100644
--- a/src/corelib/concurrent/qfuturewatcher.cpp
+++ b/src/corelib/concurrent/qfuturewatcher.cpp
@@ -589,4 +589,16 @@ void QFutureWatcherBasePrivate::sendCallOutEvent(QFutureCallOutEvent *event)
 
 QT_END_NAMESPACE
 
-#endif // QT_NO_CONCURRENT
+#else
+
+// On Symbian winscw target QT_NO_QFUTURE and QT_NO_CONCURRENT are both defined.
+// However moc will be run without having them set, so provide a dummy stub at
+// least for the slots to prevent linker errors.
+
+void QFutureWatcherBase::cancel() { }
+void QFutureWatcherBase::setPaused(bool) { }
+void QFutureWatcherBase::pause() { }
+void QFutureWatcherBase::resume() { }
+void QFutureWatcherBase::togglePaused() { }
+
+#endif // QT_NO_QFUTURE
diff --git a/src/corelib/concurrent/qfuturewatcher.h b/src/corelib/concurrent/qfuturewatcher.h
index 5fe2007..26e549d 100644
--- a/src/corelib/concurrent/qfuturewatcher.h
+++ b/src/corelib/concurrent/qfuturewatcher.h
@@ -44,8 +44,6 @@
 
 #include <QtCore/qfuture.h>
 
-#ifndef QT_NO_QFUTURE
-
 #include <QtCore/qobject.h>
 
 QT_BEGIN_HEADER
@@ -56,6 +54,11 @@ QT_MODULE(Core)
 class QEvent;
 
 class QFutureWatcherBasePrivate;
+
+#ifdef QT_NO_QFUTURE
+class QFutureInterfaceBase;
+#endif
+
 class Q_CORE_EXPORT QFutureWatcherBase : public QObject
 {
     Q_OBJECT
@@ -114,6 +117,8 @@ private:
     virtual QFutureInterfaceBase &futureInterface() = 0;
 };
 
+#ifndef QT_NO_QFUTURE
+
 template <typename T>
 class QFutureWatcher : public QFutureWatcherBase
 {
@@ -214,9 +219,9 @@ Q_INLINE_TEMPLATE void QFutureWatcher<void>::setFuture(const QFuture<void> &_fut
     connectOutputInterface();
 }
 
+#endif // QT_NO_QFUTURE
+
 QT_END_NAMESPACE
 QT_END_HEADER
 
-#endif // QT_NO_CONCURRENT
-
 #endif // QFUTUREWATCHER_H
diff --git a/src/corelib/global/qglobal.h b/src/corelib/global/qglobal.h
index 49f5f98..3e1f011 100644
--- a/src/corelib/global/qglobal.h
+++ b/src/corelib/global/qglobal.h
@@ -2545,6 +2545,16 @@ QT3_SUPPORT Q_CORE_EXPORT const char *qInstallPathSysconf();
 //Symbian does not support data imports from a DLL
 #define Q_NO_DATA_RELOCATION
 
+// Winscw compiler is unable to compile QtConcurrent.
+#ifdef Q_CC_NOKIAX86
+#ifndef QT_NO_CONCURRENT
+#define QT_NO_CONCURRENT
+#endif
+#ifndef QT_NO_QFUTURE
+#define QT_NO_QFUTURE
+#endif
+#endif
+
 QT_END_NAMESPACE
 // forward declare std::exception
 #ifdef __cplusplus