fix windows build and a couple of warnings

src/analysis/vector/qgsgeometryanalyzer.cpp

@@ -958,7 +958,7 @@ bool QgsGeometryAnalyzer::eventLayer( QgsVectorLayer* lineLayer, QgsVectorLayer*
   eventLayer->select( eventLayer->pendingAllAttributesList(), QgsRectangle(), false, false );
   QgsGeometry* lrsGeom = 0;
   QgsFeature lineFeature;
-  double measure1, measure2;
+  double measure1, measure2 = 0.0;
 
   int nEventFeatures = eventLayer->pendingFeatureCount();
   int featureCounter = 0;
@@ -1271,7 +1271,7 @@ unsigned char* QgsGeometryAnalyzer::locateBetweenWkbString( unsigned char* ptr,
 {
   int* nPoints = ( int* ) ptr;
   ptr += sizeof( int );
-  double prevx, prevy, prevz;
+  double prevx = 0.0, prevy = 0.0, prevz = 0.0;
   double *x, *y, *z;
   QgsPolyline currentLine;
 
@@ -1323,7 +1323,7 @@ unsigned char* QgsGeometryAnalyzer::locateAlongWkbString( unsigned char* ptr, Qg
 {
   int* nPoints = ( int* ) ptr;
   ptr += sizeof( int );
-  double prevx, prevy, prevz;
+  double prevx = 0.0, prevy = 0.0, prevz = 0.0;
   double *x, *y, *z;
 
   QgsPoint pt1, pt2;

src/app/legend/qgslegend.cpp

@@ -433,7 +433,7 @@ void QgsLegend::mouseMoveEvent( QMouseEvent * e )
     showItem( "layer/group" , item );
 
     int line_x = visualItemRect( item ).left();
-    int line_y;
+    int line_y = 0;
     if ( layer )
     {
       QTreeWidgetItem *lastItem = item->childCount() > 0 && item->isExpanded() ? item->child( item->childCount() - 1 ) : item;

src/core/gps/qgsgpsdetector.h

@@ -22,6 +22,13 @@
 #include <QList>
 #include <QPair>
 
+#ifdef _MSC_VER
+// qextserialport.h includes windows.h,
+// which defines min()/max() macros w/o NOMINMAX,
+// which in turn breaks limits std::numeric_limits<T>::min()/max()
+#define NOMINMAX
+#endif
+
 #include "qextserialport.h"
 
 class QgsGPSConnection;

src/gui/raster/qgsrasterhistogramwidget.cpp

@@ -676,7 +676,9 @@ void QgsRasterHistogramWidget::histoAction( const QString actionName, bool actio
   else if ( actionName.left( 5 ) == "Load " && mRendererWidget )
   {
     QVector<int> myBands;
+#if 0
     double minMaxValues[2];
+#endif
     bool ok = false;
 
     // find which band(s) need updating (all or current)

src/providers/grass/qgsgrassrasterprovider.cpp

@@ -270,8 +270,11 @@ double  QgsGrassRasterProvider::noDataValue() const
     // limit: 1.7976931348623157e+308
     nul = -1e+300;
   }
-  else if ( mGrassDataType == FCELL_TYPE )
+  else
   {
+    if ( mGrassDataType != FCELL_TYPE )
+      QgsDebugMsg( "unexpected data type" );
+
     // limit: 3.40282347e+38
     nul = -1e+30;
   }
@@ -303,7 +306,7 @@ QList<QgsColorRampShader::ColorRampItem> QgsGrassRasterProvider::colorTable( int
   QList<QgsGrass::Color> colors = QgsGrass::colors( mGisdbase, mLocation, mMapset, mMapName );
   QList<QgsGrass::Color>::iterator i;
 
-  double v, r, g, b;
+  double v = 0.0, r = 0.0, g = 0.0, b = 0.0;
   for ( i = colors.begin(); i != colors.end(); ++i )
   {
     if ( ct.count() == 0 || i->value1 != v || i->red1 != r || i->green1 != g || i->blue1 != b )