class with virtual members must always have a virtual dtor

(actually, any class that will be derived from should)

stepmania/src/Actor.h

@@ -19,8 +19,7 @@ class Actor
 {
 public:
 	Actor();
-
-
+	virtual ~Actor() { }
 
 	enum TweenType { 
 		TWEEN_LINEAR, 

stepmania/src/ActorFrame.h

@@ -22,9 +22,9 @@ class ActorFrame : public Actor
 protected:
 	CArray<Actor*,Actor*>	m_SubActors;
 
-
 public:
 	void AddSubActor( Actor* pActor);
+	virtual ~ActorFrame() { }
 
 	virtual void Update( float fDeltaTime );
 	virtual void DrawPrimitives();

stepmania/src/BitmapText.h

@@ -24,7 +24,7 @@ protected:
 
 public:
 	BitmapText();
-	~BitmapText();
+	virtual ~BitmapText();
 
 
 	bool LoadFromFont( CString sFontName );

stepmania/src/CroppedSprite.h

@@ -19,6 +19,7 @@ class CroppedSprite : public Sprite
 {
 public:
 	CroppedSprite();
+	virtual ~CroppedSprite() { }
 
 	bool Load( CString sFilePath, bool bForceReload = false, int iMipMaps = 4, int iAlphaBits = 4, bool bDither = false, bool bStretch = false );
 	void SetCroppedSize( float fWidth, float fHeight );

stepmania/src/RageBitmapTexture.h

@@ -32,7 +32,7 @@ public:
 		bool bDither = false, 
 		bool bStretch = false 
 		);
-	~RageBitmapTexture();
+	virtual ~RageBitmapTexture();
 
 	virtual void Reload( 
 		DWORD dwMaxSize,