diff --git a/src/app/legend/qgslegend.cpp b/src/app/legend/qgslegend.cpp
index 792cb30cca8c..b5ed3a5c2def 100644
--- a/src/app/legend/qgslegend.cpp
+++ b/src/app/legend/qgslegend.cpp
@@ -2541,7 +2541,7 @@ void QgsLegend::groupSelectedLayers()
   //avoid multiple refreshes of map canvas because of itemChanged signal
   blockSignals( true );
 
-  QTreeWidgetItem * parent;
+  QTreeWidgetItem * parent = 0;
   foreach( QTreeWidgetItem* item, selectedItems() )
   {
     parent = item->parent();
diff --git a/src/core/qgsprojectfiletransform.cpp b/src/core/qgsprojectfiletransform.cpp
index 0fc079867c2f..e07c5378f891 100644
--- a/src/core/qgsprojectfiletransform.cpp
+++ b/src/core/qgsprojectfiletransform.cpp
@@ -498,7 +498,7 @@ void QgsProjectFileTransform::convertRasterProperties( QDomDocument& doc, QDomNo
   if ( !transparencyElem.isNull() )
   {
     double transparency = transparencyElem.text().toInt();
-    rasterRendererElem.setAttribute( "opacity", transparency / 255.0 );
+    rasterRendererElem.setAttribute( "opacity", QString::number( transparency / 255.0 ) );
   }
 
   //alphaBand was not saved until now (bug)
diff --git a/src/core/raster/qgsbilinearrasterresampler.h b/src/core/raster/qgsbilinearrasterresampler.h
index f2359d1a13f5..d469454dfd8d 100644
--- a/src/core/raster/qgsbilinearrasterresampler.h
+++ b/src/core/raster/qgsbilinearrasterresampler.h
@@ -21,7 +21,7 @@
 #include "qgsrasterresampler.h"
 #include <QColor>
 
-class QgsBilinearRasterResampler: public QgsRasterResampler
+class CORE_EXPORT QgsBilinearRasterResampler: public QgsRasterResampler
 {
   public:
     QgsBilinearRasterResampler();
diff --git a/src/core/raster/qgscubicrasterresampler.h b/src/core/raster/qgscubicrasterresampler.h
index bb3df2d7efa5..f21273f39518 100644
--- a/src/core/raster/qgscubicrasterresampler.h
+++ b/src/core/raster/qgscubicrasterresampler.h
@@ -21,7 +21,7 @@
 #include "qgsrasterresampler.h"
 #include <QColor>
 
-class QgsCubicRasterResampler: public QgsRasterResampler
+class CORE_EXPORT QgsCubicRasterResampler: public QgsRasterResampler
 {
   public:
     QgsCubicRasterResampler();
diff --git a/src/core/raster/qgsmultibandcolorrenderer.cpp b/src/core/raster/qgsmultibandcolorrenderer.cpp
index 677b86aad243..9677dd10bd63 100644
--- a/src/core/raster/qgsmultibandcolorrenderer.cpp
+++ b/src/core/raster/qgsmultibandcolorrenderer.cpp
@@ -115,17 +115,17 @@ void QgsMultiBandColorRenderer::draw( QPainter* p, QgsRasterViewPort* viewPort,
                     && mAlphaBand < 1 && !mRedContrastEnhancement && !mGreenContrastEnhancement && !mBlueContrastEnhancement
                     && !mInvertColor );
 
-  QgsRasterDataProvider::DataType redType;
+  QgsRasterDataProvider::DataType redType = QgsRasterDataProvider::UnknownDataType;
   if ( mRedBand > 0 )
   {
     redType = ( QgsRasterDataProvider::DataType )mProvider->dataType( mRedBand );
   }
-  QgsRasterDataProvider::DataType greenType;
+  QgsRasterDataProvider::DataType greenType = QgsRasterDataProvider::UnknownDataType;
   if ( mGreenBand > 0 )
   {
     greenType = ( QgsRasterDataProvider::DataType )mProvider->dataType( mGreenBand );
   }
-  QgsRasterDataProvider::DataType blueType;
+  QgsRasterDataProvider::DataType blueType = QgsRasterDataProvider::UnknownDataType;
   if ( mBlueBand > 0 )
   {
     blueType = ( QgsRasterDataProvider::DataType )mProvider->dataType( mBlueBand );
@@ -136,7 +136,7 @@ void QgsMultiBandColorRenderer::draw( QPainter* p, QgsRasterViewPort* viewPort,
     transparencyType = ( QgsRasterDataProvider::DataType )mProvider->dataType( mAlphaBand );
   }
 
-  double oversamplingX, oversamplingY;
+  double oversamplingX = 1.0, oversamplingY = 1.0;
   QSet<int> bands;
   if ( mRedBand > 0 )
   {
diff --git a/src/core/raster/qgsmultibandcolorrenderer.h b/src/core/raster/qgsmultibandcolorrenderer.h
index f15003e3c03c..bb89002e9361 100644
--- a/src/core/raster/qgsmultibandcolorrenderer.h
+++ b/src/core/raster/qgsmultibandcolorrenderer.h
@@ -24,7 +24,7 @@ class QgsContrastEnhancement;
 class QDomElement;
 
 /**Renderer for multiband images with the color components*/
-class QgsMultiBandColorRenderer: public QgsRasterRenderer
+class CORE_EXPORT QgsMultiBandColorRenderer: public QgsRasterRenderer
 {
   public:
     QgsMultiBandColorRenderer( QgsRasterDataProvider* provider, int redBand, int greenBand, int blueBand,
diff --git a/src/core/raster/qgspalettedrasterrenderer.cpp b/src/core/raster/qgspalettedrasterrenderer.cpp
index 805986f3bfad..3d69c3d60b7e 100644
--- a/src/core/raster/qgspalettedrasterrenderer.cpp
+++ b/src/core/raster/qgspalettedrasterrenderer.cpp
@@ -42,8 +42,8 @@ QgsRasterRenderer* QgsPalettedRasterRenderer::create( const QDomElement& elem, Q
   }
 
   int bandNumber = elem.attribute( "band", "-1" ).toInt();
-  int nColors;
-  QColor* colors;
+  int nColors = 0;
+  QColor* colors = 0;
 
   QDomElement paletteElem = elem.firstChildElement( "colorPalette" );
   if ( !paletteElem.isNull() )
@@ -118,7 +118,7 @@ void QgsPalettedRasterRenderer::draw( QPainter* p, QgsRasterViewPort* viewPort,
 
   //rendering is faster without considering user-defined transparency
   bool hasTransparency = usesTransparency( viewPort->mSrcCRS, viewPort->mDestCRS );
-  void* transparencyData;
+  void* transparencyData = 0;
 
   while ( readNextRasterPart( mBandNumber, oversamplingX, oversamplingY, viewPort, nCols, nRows, nRasterCols, nRasterRows,
                               &rasterData, topLeftCol, topLeftRow ) )
diff --git a/src/core/raster/qgspalettedrasterrenderer.h b/src/core/raster/qgspalettedrasterrenderer.h
index a5a21280a679..1357d5b8cf5f 100644
--- a/src/core/raster/qgspalettedrasterrenderer.h
+++ b/src/core/raster/qgspalettedrasterrenderer.h
@@ -23,7 +23,7 @@
 class QColor;
 class QDomElement;
 
-class QgsPalettedRasterRenderer: public QgsRasterRenderer
+class CORE_EXPORT QgsPalettedRasterRenderer: public QgsRasterRenderer
 {
   public:
     /**Renderer owns color array*/
diff --git a/src/core/raster/qgsrasterrenderer.cpp b/src/core/raster/qgsrasterrenderer.cpp
index 93ebf0e954f1..d58e3162f1c9 100644
--- a/src/core/raster/qgsrasterrenderer.cpp
+++ b/src/core/raster/qgsrasterrenderer.cpp
@@ -105,7 +105,7 @@ void QgsRasterRenderer::startRasterRead( int bandNumber, QgsRasterViewPort* view
 
   int totalMemoryUsage = pInfo.nCols * oversamplingX * pInfo.nRows * oversamplingY * mProvider->dataTypeSize( bandNumber );
   int parts = totalMemoryUsage / 100000000 + 1;
-  int nPartsPerDimension = sqrt( parts );
+  int nPartsPerDimension = sqrt(( double ) parts );
   pInfo.nColsPerPart = pInfo.nCols / nPartsPerDimension;
   pInfo.nRowsPerPart = pInfo.nRows / nPartsPerDimension;
   pInfo.currentCol = 0;
@@ -246,7 +246,7 @@ void QgsRasterRenderer::drawImage( QPainter* p, QgsRasterViewPort* viewPort, con
   }
 
   //get QgsRasterProjector
-  QgsRasterProjector* prj;
+  QgsRasterProjector* prj = 0;
   QMap<int, RasterPartInfo>::const_iterator partInfoIt = mRasterPartInfos.constBegin();
   if ( partInfoIt != mRasterPartInfos.constEnd() )
   {
@@ -326,9 +326,9 @@ void QgsRasterRenderer::_writeXML( QDomDocument& doc, QDomElement& rasterRendere
   }
 
   rasterRendererElem.setAttribute( "type", mType );
-  rasterRendererElem.setAttribute( "opacity", mOpacity );
+  rasterRendererElem.setAttribute( "opacity", QString::number( mOpacity ) );
   rasterRendererElem.setAttribute( "alphaBand", mAlphaBand );
-  rasterRendererElem.setAttribute( "maxOversampling", mMaxOversampling );
+  rasterRendererElem.setAttribute( "maxOversampling", QString::number( mMaxOversampling ) );
   rasterRendererElem.setAttribute( "invertColor", mInvertColor );
   if ( mZoomedInResampler )
   {
diff --git a/src/core/raster/qgsrasterrenderer.h b/src/core/raster/qgsrasterrenderer.h
index 944a4f60fb2f..a6cf46e8ace1 100644
--- a/src/core/raster/qgsrasterrenderer.h
+++ b/src/core/raster/qgsrasterrenderer.h
@@ -26,11 +26,11 @@ class QgsMapToPixel;
 class QgsRasterResampler;
 class QgsRasterProjector;
 class QgsRasterTransparency;
-class QgsRasterViewPort;
+struct QgsRasterViewPort;
 
 class QDomElement;
 
-class QgsRasterRenderer
+class CORE_EXPORT QgsRasterRenderer
 {
   public:
     //Stores information about reading of a raster band. Columns and rows are in unsampled coordinates
diff --git a/src/core/raster/qgsrasterrendererregistry.h b/src/core/raster/qgsrasterrendererregistry.h
index ed1f83295a9f..d63af0d9173e 100644
--- a/src/core/raster/qgsrasterrendererregistry.h
+++ b/src/core/raster/qgsrasterrendererregistry.h
@@ -30,7 +30,7 @@ class QgsRasterRendererWidget;
 typedef QgsRasterRenderer*( *QgsRasterRendererCreateFunc )( const QDomElement&, QgsRasterDataProvider* provider );
 typedef QgsRasterRendererWidget*( *QgsRasterRendererWidgetCreateFunc )( QgsRasterLayer* );
 
-struct QgsRasterRendererRegistryEntry
+struct CORE_EXPORT QgsRasterRendererRegistryEntry
 {
   QgsRasterRendererRegistryEntry( const QString& theName, const QString& theVisibleName, QgsRasterRendererCreateFunc rendererFunction,
                                   QgsRasterRendererWidgetCreateFunc widgetFunction );
@@ -41,7 +41,7 @@ struct QgsRasterRendererRegistryEntry
   QgsRasterRendererWidgetCreateFunc widgetCreateFunction; //pointer to create function for renderer widget
 };
 
-class QgsRasterRendererRegistry
+class CORE_EXPORT QgsRasterRendererRegistry
 {
   public:
     static QgsRasterRendererRegistry* instance();
diff --git a/src/core/raster/qgsrastershader.cpp b/src/core/raster/qgsrastershader.cpp
index c28b8e76381d..d6cc3c878c50 100644
--- a/src/core/raster/qgsrastershader.cpp
+++ b/src/core/raster/qgsrastershader.cpp
@@ -147,7 +147,7 @@ void QgsRasterShader::writeXML( QDomDocument& doc, QDomElement& parent ) const
     {
       QDomElement itemElem = doc.createElement( "item" );
       itemElem.setAttribute( "label", itemIt->label );
-      itemElem.setAttribute( "value", itemIt->value );
+      itemElem.setAttribute( "value", QString::number( itemIt->value ) );
       itemElem.setAttribute( "color", itemIt->color.name() );
       colorRampShaderElem.appendChild( itemElem );
     }
diff --git a/src/core/raster/qgssinglebandgrayrenderer.h b/src/core/raster/qgssinglebandgrayrenderer.h
index 60b93d10de03..f86cdb7409d9 100644
--- a/src/core/raster/qgssinglebandgrayrenderer.h
+++ b/src/core/raster/qgssinglebandgrayrenderer.h
@@ -23,7 +23,7 @@
 class QgsContrastEnhancement;
 class QDomElement;
 
-class QgsSingleBandGrayRenderer: public QgsRasterRenderer
+class CORE_EXPORT QgsSingleBandGrayRenderer: public QgsRasterRenderer
 {
   public:
     QgsSingleBandGrayRenderer( QgsRasterDataProvider* provider, int grayBand );
diff --git a/src/core/raster/qgssinglebandpseudocolorrenderer.cpp b/src/core/raster/qgssinglebandpseudocolorrenderer.cpp
index fbcf9de6ad61..b394a50612c2 100644
--- a/src/core/raster/qgssinglebandpseudocolorrenderer.cpp
+++ b/src/core/raster/qgssinglebandpseudocolorrenderer.cpp
@@ -89,7 +89,7 @@ void QgsSingleBandPseudoColorRenderer::draw( QPainter* p, QgsRasterViewPort* vie
   int topLeftCol = 0;
   int topLeftRow = 0;
   void* rasterData;
-  void* transparencyData;
+  void* transparencyData = 0;
   double currentOpacity = mOpacity;
   QgsRasterDataProvider::DataType rasterType = ( QgsRasterDataProvider::DataType )mProvider->dataType( mBand );
   int red, green, blue;
diff --git a/src/core/raster/qgssinglebandpseudocolorrenderer.h b/src/core/raster/qgssinglebandpseudocolorrenderer.h
index 2c4743e5ef43..cb7f0c7f94bc 100644
--- a/src/core/raster/qgssinglebandpseudocolorrenderer.h
+++ b/src/core/raster/qgssinglebandpseudocolorrenderer.h
@@ -23,7 +23,7 @@
 class QDomElement;
 class QgsRasterShader;
 
-class QgsSingleBandPseudoColorRenderer: public QgsRasterRenderer
+class CORE_EXPORT QgsSingleBandPseudoColorRenderer: public QgsRasterRenderer
 {
   public:
     /**Note: takes ownership of QgsRasterShader*/
diff --git a/src/gui/raster/qgsmultibandcolorrendererwidget.h b/src/gui/raster/qgsmultibandcolorrendererwidget.h
index 99413c2f833e..4bbb2182bc96 100644
--- a/src/gui/raster/qgsmultibandcolorrendererwidget.h
+++ b/src/gui/raster/qgsmultibandcolorrendererwidget.h
@@ -27,7 +27,7 @@ class QgsRasterDataProvider;
 class QgsRasterLayer;
 class QLineEdit;
 
-class QgsMultiBandColorRendererWidget: public QgsRasterRendererWidget, private Ui::QgsMultiBandColorRendererWidgetBase
+class GUI_EXPORT QgsMultiBandColorRendererWidget: public QgsRasterRendererWidget, private Ui::QgsMultiBandColorRendererWidgetBase
 {
     Q_OBJECT
 
diff --git a/src/gui/raster/qgspalettedrendererwidget.h b/src/gui/raster/qgspalettedrendererwidget.h
index c42a09cb5680..4b7a4f1a6485 100644
--- a/src/gui/raster/qgspalettedrendererwidget.h
+++ b/src/gui/raster/qgspalettedrendererwidget.h
@@ -23,7 +23,7 @@
 
 class QgsRasterLayer;
 
-class QgsPalettedRendererWidget: public QgsRasterRendererWidget, private Ui::QgsPalettedRendererWidgetBase
+class GUI_EXPORT QgsPalettedRendererWidget: public QgsRasterRendererWidget, private Ui::QgsPalettedRendererWidgetBase
 {
     Q_OBJECT
 
diff --git a/src/gui/raster/qgsrasterrendererwidget.h b/src/gui/raster/qgsrasterrendererwidget.h
index c4b2e27d5377..d815f5d79cf1 100644
--- a/src/gui/raster/qgsrasterrendererwidget.h
+++ b/src/gui/raster/qgsrasterrendererwidget.h
@@ -23,7 +23,7 @@
 class QgsRasterLayer;
 class QgsRasterRenderer;
 
-class QgsRasterRendererWidget: public QWidget
+class GUI_EXPORT QgsRasterRendererWidget: public QWidget
 {
   public:
     QgsRasterRendererWidget( QgsRasterLayer* layer ) { mRasterLayer = layer; }
diff --git a/src/gui/raster/qgssinglebandgrayrendererwidget.h b/src/gui/raster/qgssinglebandgrayrendererwidget.h
index c5b833307300..3b2926c6f456 100644
--- a/src/gui/raster/qgssinglebandgrayrendererwidget.h
+++ b/src/gui/raster/qgssinglebandgrayrendererwidget.h
@@ -21,7 +21,7 @@
 #include "qgsrasterrendererwidget.h"
 #include "ui_qgssinglebandgrayrendererwidgetbase.h"
 
-class QgsSingleBandGrayRendererWidget: public QgsRasterRendererWidget, private Ui::QgsSingleBandGrayRendererWidgetBase
+class GUI_EXPORT QgsSingleBandGrayRendererWidget: public QgsRasterRendererWidget, private Ui::QgsSingleBandGrayRendererWidgetBase
 {
     Q_OBJECT
   public:
diff --git a/src/gui/raster/qgssinglebandpseudocolorrendererwidget.h b/src/gui/raster/qgssinglebandpseudocolorrendererwidget.h
index 6b58c958f648..d509e8baf372 100644
--- a/src/gui/raster/qgssinglebandpseudocolorrendererwidget.h
+++ b/src/gui/raster/qgssinglebandpseudocolorrendererwidget.h
@@ -22,7 +22,7 @@
 #include "qgscolorrampshader.h"
 #include "ui_qgssinglebandpseudocolorrendererwidgetbase.h"
 
-class QgsSingleBandPseudoColorRendererWidget: public QgsRasterRendererWidget,
+class GUI_EXPORT QgsSingleBandPseudoColorRendererWidget: public QgsRasterRendererWidget,
       private Ui::QgsSingleBandPseudoColorRendererWidgetBase
 {
     Q_OBJECT
diff --git a/src/providers/wms/qgswmsprovider.cpp b/src/providers/wms/qgswmsprovider.cpp
index 49a6238b63fc..744f30625a21 100644
--- a/src/providers/wms/qgswmsprovider.cpp
+++ b/src/providers/wms/qgswmsprovider.cpp
@@ -2548,6 +2548,7 @@ void QgsWmsProvider::parseWMTSContents( QDomElement const &e )
         metersPerUnit = 111319.49079327358;
         break;
 
+      default:
       case QGis::UnknownUnit:
         QgsDebugMsg( "Unknown CRS units - assuming meters" );
         metersPerUnit = 1.0;