diff --git a/examples/gdpbarchart/widget.cpp b/examples/gdpbarchart/widget.cpp
index 3281e96..0a3a84c 100644
--- a/examples/gdpbarchart/widget.cpp
+++ b/examples/gdpbarchart/widget.cpp
@@ -86,7 +86,7 @@ Widget::Widget(QWidget *parent)
     }
 
     // hide axis X labels
-    QChartAxis* axis = chartArea->axisX();
+    //QChartAxis* axis = chartArea->axisX();
 //    axis->
     //    axis->setLabelsVisible(false);
     //    newAxis.setLabelsOrientation(QChartAxis::LabelsOrientationSlide);
diff --git a/examples/stackedbarchartdrilldown/main.cpp b/examples/stackedbarchartdrilldown/main.cpp
index 31b0f4f..e409e68 100644
--- a/examples/stackedbarchartdrilldown/main.cpp
+++ b/examples/stackedbarchartdrilldown/main.cpp
@@ -55,6 +55,7 @@ public:
 public Q_SLOTS:
     void handleRightClick(QBarSet *barset, QString category)
     {
+        Q_UNUSED(barset)
         DrilldownBarSeries* series = static_cast<DrilldownBarSeries*> (sender());
         changeSeries(series->drilldownSeries(category));
     }
diff --git a/examples/tablemodelchart/customtablemodel.cpp b/examples/tablemodelchart/customtablemodel.cpp
index bd21116..bb05ef6 100644
--- a/examples/tablemodelchart/customtablemodel.cpp
+++ b/examples/tablemodelchart/customtablemodel.cpp
@@ -19,11 +19,13 @@ CustomTableModel::CustomTableModel(QObject *parent) :
 
 int CustomTableModel::rowCount(const QModelIndex & parent) const
 {
+    Q_UNUSED(parent)
     return m_points.count();
 }
 
 int CustomTableModel::columnCount(const QModelIndex & parent) const
 {
+    Q_UNUSED(parent)
     return 3;
 }
 
@@ -63,7 +65,7 @@ QVariant CustomTableModel::data(const QModelIndex & index, int role) const
         case 2:
             return m_labels[index.row()];
         default:
-            return QVariant();
+            break;
         }
     }
     else if (role == Qt::EditRole)
@@ -77,9 +79,10 @@ QVariant CustomTableModel::data(const QModelIndex & index, int role) const
         case 2:
             return m_labels[index.row()];
         default:
-            return QVariant();
+            break;
         }
     }
+    return QVariant();
 }
 
 bool CustomTableModel::setData ( const QModelIndex & index, const QVariant & value, int role)
@@ -115,6 +118,8 @@ Qt::ItemFlags CustomTableModel::flags ( const QModelIndex & index ) const
 
 bool CustomTableModel::insertRows ( int row, int count, const QModelIndex & parent)
 {
+    Q_UNUSED(parent)
+
     if (row < 0)
         row = 0;
     beginInsertRows(QModelIndex(), row /*dataTable.count()*/, row + count - 1);