Fix some compile warnings

DSView/pv/data/decode/decoder.h

@@ -24,6 +24,9 @@
 
 #include <map>
 #include <set>
+#include <string>
+#include <sstream>
+#include <iostream>
 
 #include <boost/shared_ptr.hpp>
 

DSView/pv/data/signaldata.cpp

@@ -32,6 +32,8 @@ SignalData::SignalData() :
 {
 }
 
+SignalData::~SignalData() {}
+
 double SignalData::samplerate() const
 {
 	return _samplerate;

DSView/pv/data/signaldata.h

@@ -34,7 +34,7 @@ class SignalData
 {
 public:
     SignalData();
-
+    virtual ~SignalData() = 0;
 public:
     double samplerate() const;
     void set_samplerate(double samplerate);

DSView/pv/dialogs/calibration.cpp

@@ -45,7 +45,7 @@ const QString Calibration::VCOMB = QT_TR_NOOP(" VCOMB");
 Calibration::Calibration(QWidget *parent) :
     DSDialog(parent)
 {
-#ifdef Q_OS_OSX
+#ifdef Q_OS_DARWIN
     Qt::WindowFlags flags = windowFlags();
     this->setWindowFlags(flags | Qt::Tool);
 #endif

DSView/pv/view/xcursor.cpp

@@ -50,7 +50,7 @@ XCursor::XCursor(View &view, QColor &colour,
     const std::vector< boost::shared_ptr<Signal> > sigs(_view.session().get_signals());
     BOOST_FOREACH(const boost::shared_ptr<Signal> s, sigs) {
         boost::shared_ptr<DsoSignal> dsoSig;
-        if (dsoSig = dynamic_pointer_cast<DsoSignal>(s))
+        if ((dsoSig = dynamic_pointer_cast<DsoSignal>(s)))
             if (dsoSig->enabled()) {
                 _dsoSig = dsoSig;
                 break;