Fix a number of build warnings that could lead to unstable operation

This breaks the ABI

src/3rdparty/opentype/ftglue.c

@@ -290,7 +290,6 @@ ftglue_face_goto_table( FT_Face    face,
     if ( face->num_faces > 1 )
     {
       /* deal with TrueType collections */
-      FT_ULong  offset;
 
       LOG(( ">> This is a TrueType Collection\n" ));
 
@@ -298,8 +297,6 @@ ftglue_face_goto_table( FT_Face    face,
            ACCESS_Frame( 4 )                    )
         goto Exit;
 
-      offset = GET_ULong();
-
       FORGET_Frame();
     }
 

src/codecs/qjpunicode.h

@@ -83,6 +83,9 @@
 #endif
 
 class Q_EXPORT_CODECS_JP QJpUnicodeConv {
+public:
+    virtual ~QJpUnicodeConv() {}
+
 public:
     enum Rules {
 	// "ASCII" is ANSI X.3.4-1986, a.k.a. US-ASCII here.

src/iconview/qiconview.cpp

@@ -381,6 +381,7 @@ class QIconViewToolTip : public QToolTip
 {
 public:
     QIconViewToolTip( QWidget *parent, QIconView *iv );
+    virtual ~QIconViewToolTip();
 
     void maybeTip( const QPoint &pos );
 
@@ -393,6 +394,10 @@ QIconViewToolTip::QIconViewToolTip( QWidget *parent, QIconView *iv )
 {
 }
 
+QIconViewToolTip::~QIconViewToolTip()
+{
+}
+
 void QIconViewToolTip::maybeTip( const QPoint &pos )
 {
     if ( !parentWidget() || !view || view->wordWrapIconText() || !view->showToolTips() )

src/kernel/qapplication_x11.cpp

@@ -430,7 +430,7 @@ static bool qt_x11EventFilter( XEvent* ev )
 //XIM		qt_xim			= 0;
 Q_EXPORT XIMStyle	qt_xim_style		= 0;
 Q_EXPORT XIMStyle	qt_xim_preferred_style	= 0;
-Q_EXPORT static XIMStyle xim_default_style	= XIMPreeditCallbacks | XIMStatusNothing;
+static XIMStyle xim_default_style	= XIMPreeditCallbacks | XIMStatusNothing;
 #endif
 
 Q_EXPORT int qt_ximComposingKeycode=0;
@@ -5889,7 +5889,7 @@ static Bool qt_net_wm_sync_request_scanner(Display*, XEvent* event, XPointer arg
 {
     return (event->type == ClientMessage && event->xclient.window == *(Window*)arg
         && event->xclient.message_type == qt_wm_protocols
-        && event->xclient.data.l[ 0 ] == qt_net_wm_sync_request );
+        && ((unsigned int)event->xclient.data.l[ 0 ]) == qt_net_wm_sync_request );
 }
 #endif
 

src/kernel/qdragobject.cpp

@@ -1749,9 +1749,9 @@ QColorDrag::QColorDrag( QWidget *dragsource, const char *name )
 
 void QColorDrag::setColor( const QColor &col )
 {
-    short r = (col.red()   << 8) | col.red();
+    unsigned short r = (col.red()   << 8) | col.red();
-    short g = (col.green() << 8) | col.green();
+    unsigned short g = (col.green() << 8) | col.green();
-    short b = (col.blue()  << 8) | col.blue();
+    unsigned short b = (col.blue()  << 8) | col.blue();
 
     // make sure we transmit data in network order
     r = htons(r);

src/kernel/qeventloop_unix_glib.cpp

@@ -505,7 +505,9 @@ void QEventLoop::wakeUp()
     size_t nbytes = 0;
     char c = 0;
     if ( ::ioctl( d->thread_pipe[0], FIONREAD, (char*)&nbytes ) >= 0 && nbytes == 0 ) {
-	::write(  d->thread_pipe[1], &c, 1  );
+	if (::write(  d->thread_pipe[1], &c, 1  ) < 0) {
+		// Failed!
+	}
     }
 }
 

src/kernel/qimage.cpp

@@ -5424,6 +5424,7 @@ static void write_pbm_image( QImageIO *iio )
 class QImageIOFrameGrabber : public QImageConsumer {
 public:
     QImageIOFrameGrabber() : framecount(0) { }
+    virtual ~QImageIOFrameGrabber() { }
 
     QImageDecoder *decoder;
     int framecount;

src/kernel/qinputcontext.cpp

@@ -477,6 +477,7 @@ bool QInputContext::isComposing() const
 */
 bool QInputContext::filterEvent( const QEvent *event )
 {
+    Q_UNUSED(event);
     return FALSE;
 }
 
@@ -679,6 +680,11 @@ void QInputContext::unsetFocus()
 */
 void QInputContext::setMicroFocus( int x, int y, int w, int h, QFont *f )
 {
+    Q_UNUSED(x);
+    Q_UNUSED(y);
+    Q_UNUSED(w);
+    Q_UNUSED(h);
+    Q_UNUSED(f);
 }
 
 
@@ -705,6 +711,9 @@ void QInputContext::mouseHandler( int x, QEvent::Type type,
 				  Qt::ButtonState button,
 				  Qt::ButtonState state )
 {
+    Q_UNUSED(x);
+    Q_UNUSED(button);
+    Q_UNUSED(state);
     // Default behavior for simple ephemeral input contexts. Some
     // complex input contexts should not be reset here.
     if ( type == QEvent::MouseButtonPress ||

src/kernel/qinputcontext_x11.cpp

@@ -67,6 +67,8 @@
 */
 bool QInputContext::x11FilterEvent( QWidget *keywidget, XEvent *event )
 {
+    Q_UNUSED(keywidget);
+    Q_UNUSED(event);
     return FALSE;
 }
 

src/kernel/qjpegio.cpp

@@ -80,7 +80,7 @@ void my_error_exit (j_common_ptr cinfo)
     my_error_mgr* myerr = (my_error_mgr*) cinfo->err;
     char buffer[JMSG_LENGTH_MAX];
     (*cinfo->err->format_message)(cinfo, buffer);
-    qWarning(buffer);
+    qWarning("%s", buffer);
     longjmp(myerr->setjmp_buffer, 1);
 }
 

src/kernel/qnetworkprotocol.cpp

@@ -381,6 +381,14 @@ public:
     of these values.
 */
 
+QNetworkProtocolFactoryBase::QNetworkProtocolFactoryBase() {
+	//
+}
+
+QNetworkProtocolFactoryBase::~QNetworkProtocolFactoryBase() {
+	//
+}
+
 /*!
     Constructor of the network protocol base class. Does some
     initialization and connecting of signals and slots.

src/kernel/qnetworkprotocol.h

@@ -63,6 +63,10 @@ template <class T> class QValueList;
 
 class Q_EXPORT QNetworkProtocolFactoryBase
 {
+public:
+   QNetworkProtocolFactoryBase();
+   virtual ~QNetworkProtocolFactoryBase();
+
 public:
    virtual QNetworkProtocol *createObject() = 0;
 

src/kernel/qprocess_unix.cpp

@@ -379,7 +379,9 @@ void QProcessManager::sigchldHnd( int fd )
     }
 
     char tmp;
-    ::read( fd, &tmp, sizeof(tmp) );
+    if (::read( fd, &tmp, sizeof(tmp) ) < 0) {
+	qWarning( "Could not read from file descriptor" );
+    }
 #if defined(QT_QPROCESS_DEBUG)
     qDebug( "QProcessManager::sigchldHnd()" );
 #endif
@@ -562,7 +564,9 @@ QT_SIGNAL_RETTYPE qt_C_sigchldHnd( QT_SIGNAL_ARGS )
 	return;
 
     char a = 1;
-    ::write( QProcessPrivate::procManager->sigchldFd[0], &a, sizeof(a) );
+    if (::write( QProcessPrivate::procManager->sigchldFd[0], &a, sizeof(a) ) < 0) {
+	qWarning( "Could not write to file descriptor" );
+    }
 }
 
 

src/kernel/qscriptengine_x11.cpp

@@ -2725,11 +2725,7 @@ static bool khmer_shape_syllable(QOpenType *openType, QShaperItem *item)
 
 #ifndef QT_NO_XFTFREETYPE
     if (openType) {
-	unsigned short logClusters[16];
+	uint where[16];
-	for (int i = 0; i < len; ++i)
-	    logClusters[i] = i;
-
- 	uint where[16];
 
         for (int i = 0; i < len; ++i) {
             where[i] = ~(PreSubstProperty
@@ -3236,11 +3232,7 @@ static bool myanmar_shape_syllable(QOpenType *openType, QShaperItem *item, bool
 
 #ifndef QT_NO_XFTFREETYPE
     if (openType) {
-	unsigned short logClusters[32];
+	uint where[32];
-	for (int i = 0; i < len; ++i)
-	    logClusters[i] = i;
-
- 	uint where[32];
 
         for (int i = 0; i < len; ++i) {
             where[i] = ~(PreSubstProperty

src/kernel/qstyle.h

@@ -290,6 +290,7 @@ class Q_EXPORT QStyleControlElementData {
 		QString caption;
 		QStyleControlElementGenericWidgetData topLevelWidgetData;
 		Q_UINT32 topLevelWidgetFlags;
+		QPixmap paletteBgPixmap;
 };
 
 class Q_EXPORT QStyleWidgetActionRequestData {
@@ -1070,6 +1071,18 @@ public:
 	// bool - whether or not the upper two button drawing areas should be combined into one
 	SH_ScrollBar_CombineSubLineRegionDrawingAreas,
 
+	// Qt::QRgb - color of the popup menu arrow (active, menuitem enabled)
+	SH_PopupMenu_SubMenuArrowColorActiveEnabled,
+
+	// Qt::QRgb - color of the popup menu arrow (active, menuitem disabled)
+	SH_PopupMenu_SubMenuArrowColorActiveDisabled,
+
+	// Qt::QRgb - color of the popup menu arrow (inactive, menuitem enabled)
+	SH_PopupMenu_SubMenuArrowColorInactiveEnabled,
+
+	// Qt::QRgb - color of the popup menu arrow (active, menuitem disabled)
+	SH_PopupMenu_SubMenuArrowColorInactiveDisabled,
+
 	// do not add any values below/greater than this
 	SH_CustomBase =		0xf0000000
     };

src/network/qdns.cpp

@@ -102,11 +102,17 @@ static Q_UINT32 now()
     return 0;
 }
 
+#if defined(__GLIBC__) && ((__GLIBC__ > 2) || ((__GLIBC__ == 2) && (__GLIBC_MINOR__ >= 3)))
+#define Q_MODERN_RES_API
+#else
+#endif
 
 static QPtrList<QHostAddress> * ns = 0;
 static QStrList * domains = 0;
 static bool ipv6support = FALSE;
 
+#if defined(Q_MODERN_RES_API)
+#else
 static int qdns_res_init()
 {
 #ifdef Q_OS_MAC
@@ -124,6 +130,7 @@ static int qdns_res_init()
     return 0; // not called at all on Windows.
 #endif
 }
+#endif
 
 
 class QDnsPrivate {
@@ -2539,11 +2546,6 @@ void QDns::doSynchronousLookup()
 }
 #endif
 
-#if defined(__GLIBC__) && ((__GLIBC__ > 2) || ((__GLIBC__ == 2) && (__GLIBC_MINOR__ >= 3)))
-#define Q_MODERN_RES_API
-#else
-#endif
-
 void QDns::doResInit()
 {
     if ( ns )

src/sql/qsqldatabase.cpp

@@ -144,6 +144,12 @@ public:
     QSqlQuery createQuery() const { return QSqlQuery( new QNullResult(this) ); }
 };
 
+QSqlDriverCreatorBase::QSqlDriverCreatorBase() {
+}
+
+QSqlDriverCreatorBase::~QSqlDriverCreatorBase() {
+}
+
 typedef QDict<QSqlDriverCreatorBase> QDriverDict;
 
 class QSqlDatabaseManager : public QObject

src/sql/qsqldatabase.h

@@ -65,6 +65,9 @@ class QSqlDatabasePrivate;
 
 class QM_EXPORT_SQL QSqlDriverCreatorBase
 {
+public:
+    QSqlDriverCreatorBase();
+    virtual ~QSqlDriverCreatorBase();
 public:
     virtual QSqlDriver* createObject() = 0;
 };

src/styles/qcommonstyle.cpp

@@ -347,6 +347,11 @@ QStyleControlElementData populateControlElementDataFromWidget(const QWidget* wid
 				const QButton *button = dynamic_cast<const QButton*>(widget);
 				if (button) {
 					ceData.text = button->text();
+					const QPixmap* paletteBgPixmap = 0;
+					paletteBgPixmap = button->paletteBackgroundPixmap();
+					if (paletteBgPixmap) {
+						ceData.paletteBgPixmap = *paletteBgPixmap;
+					}
 				}
 			}
 			if (ceData.widgetObjectTypes.contains("QTabBar")) {
@@ -3215,6 +3220,13 @@ int QCommonStyle::styleHint(StyleHint sh, const QStyleControlElementData &ceData
 	ret = 0;
 	break;
 
+    case SH_PopupMenu_SubMenuArrowColorActiveEnabled:
+    case SH_PopupMenu_SubMenuArrowColorActiveDisabled:
+    case SH_PopupMenu_SubMenuArrowColorInactiveEnabled:
+    case SH_PopupMenu_SubMenuArrowColorInactiveDisabled:
+	ret = -1;
+	break;
+
     default:
 	ret = 0;
 	break;

src/widgets/qlistview.cpp

@@ -265,6 +265,7 @@ class QListViewToolTip : public QToolTip
 {
 public:
     QListViewToolTip( QWidget *parent, QListView *lv );
+    virtual ~QListViewToolTip();
 
     void maybeTip( const QPoint &pos );
 
@@ -278,6 +279,10 @@ QListViewToolTip::QListViewToolTip( QWidget *parent, QListView *lv )
 {
 }
 
+QListViewToolTip::~QListViewToolTip()
+{
+}
+
 void QListViewToolTip::maybeTip( const QPoint &pos )
 {
     if ( !parentWidget() || !view || !view->showToolTips() )

src/widgets/qpopupmenu.cpp

@@ -1391,6 +1391,7 @@ void QPopupMenu::show()
     performDelayedChanges();
     updateSize(TRUE);
     QWidget::show();
+    updateSize();
     popupActive = -1;
     if(style().styleHint(QStyle::SH_PopupMenu_SubMenuPopupDelay, this))
 	d->mouseMoveBuffer = QRegion();

src/widgets/qtooltip.cpp

@@ -824,6 +824,10 @@ QToolTip::QToolTip( QWidget * widget, QToolTipGroup * group )
 		     QString::null, g, QString::null, this, FALSE );
 }
 
+QToolTip::~QToolTip()
+{
+}
+
 
 /*!
     Adds a tool tip to \a widget. \a text is the text to be shown in

src/widgets/qtooltip.h

@@ -92,6 +92,7 @@ class Q_EXPORT QToolTip: public Qt
 {
 public:
     QToolTip( QWidget *, QToolTipGroup * = 0 );
+    virtual ~QToolTip();
     //### add virtual d'tor for 4.0
 
     static void add( QWidget *, const QString &);