From Eric Sokolowsky, warning fixes for g++ 4.0 under Fedora Core 4.

include/osg/Array

@@ -286,6 +286,7 @@ class ArrayVisitor
 {
     public:
         ArrayVisitor() {}
+        virtual ~ArrayVisitor() {}
         
         virtual void apply(Array&) {}
         virtual void apply(ByteArray&) {}
@@ -315,6 +316,7 @@ class ConstArrayVisitor
 {
     public:
         ConstArrayVisitor() {}
+        virtual ~ConstArrayVisitor() {}
         
         virtual void apply(const Array&) {}
         virtual void apply(const ByteArray&) {}
@@ -345,6 +347,7 @@ class ValueVisitor
 {
     public:
         ValueVisitor() {}
+        virtual ~ValueVisitor() {}
         
         virtual void apply(GLbyte&) {}
         virtual void apply(GLshort&) {}
@@ -374,6 +377,7 @@ class ConstValueVisitor
 {
     public:
         ConstValueVisitor() {}
+        virtual ~ConstValueVisitor() {}
         
         virtual void apply(const GLbyte&) {}
         virtual void apply(const GLshort&) {}

include/osg/Shape

@@ -104,6 +104,7 @@ class ShapeVisitor
     public:
     
     	ShapeVisitor() {}
+        virtual ~ShapeVisitor() {}
     
     	virtual void apply(Sphere&) {}
     	virtual void apply(Box&) {}
@@ -124,6 +125,7 @@ class ConstShapeVisitor
     public:
     
     	ConstShapeVisitor() {}
+        virtual ~ConstShapeVisitor() {}
 
     	virtual void apply(const Sphere&) {}
     	virtual void apply(const Box&) {}

include/osg/StateAttribute

@@ -258,6 +258,7 @@ class OSG_EXPORT StateAttribute : public Object
 
         struct ModeUsage
         {
+            virtual ~ModeUsage() {}
             virtual void usesMode(GLMode mode) = 0;
             virtual void usesTextureMode(GLMode mode) = 0;
         };

include/osgDB/Registry

@@ -31,6 +31,7 @@ namespace osgDB {
 
 /** basic structure for custom runtime inheritance checking */
 struct basic_type_wrapper {
+    virtual ~basic_type_wrapper() {}
     virtual bool matches(const osg::Object *proto) const = 0;
 };
 
@@ -74,11 +75,11 @@ class OSGDB_EXPORT Registry : public osg::Referenced
         void readCommandLine(osg::ArgumentParser& commandLine);
 
         /** register an .fileextension alias to mapExt toExt, the later
-	  * should the the extension name of the readerwriter plugin library.
-	  * For example to map .tif files to the tiff loader, use
-	  * addExtAlias("tif","tiff") which will enable .tif to be read
-	  * by the libdb_tiff readerwriter plugin.*/
-	void addFileExtensionAlias(const std::string mapExt, const std::string toExt);
+          * should the the extension name of the readerwriter plugin library.
+          * For example to map .tif files to the tiff loader, use
+          * addExtAlias("tif","tiff") which will enable .tif to be read
+          * by the libdb_tiff readerwriter plugin.*/
+        void addFileExtensionAlias(const std::string mapExt, const std::string toExt);
 
         void addDotOsgWrapper(DotOsgWrapper* wrapper);
         void removeDotOsgWrapper(DotOsgWrapper* wrapper);
@@ -335,8 +336,8 @@ class OSGDB_EXPORT Registry : public osg::Referenced
         /** Add a filename,object,timestamp tripple to the Registry::ObjectCache.*/
         void addEntryToObjectCache(const std::string& filename, osg::Object* object, double timestamp = 0.0);
 
-	/** Get an object from the object cache*/ 
-	osg::Object* getFromObjectCache(const std::string& fileName);
+        /** Get an object from the object cache*/ 
+        osg::Object* getFromObjectCache(const std::string& fileName);
         
         /** Add archive to archive cache so that future calls reference this archive.*/
         void addToArchiveCache(const std::string& fileName, osgDB::Archive* archive);

include/osgGA/GUIActionAdapter

@@ -54,6 +54,7 @@ then you then respond the flag being set in your own leisure.
 class GUIActionAdapter
 {
 public:
+        virtual ~GUIActionAdapter() {}
         
         /**
         requestRedraw() requests a single redraw.