Added virtual destructors (in most cases protected) to remove g++ warnings:

'class ...' has virtual functions but non-virtual destructor

src/ca/cac.h

@@ -65,6 +65,8 @@ public:
         epicsGuard < epicsMutex > &, netWriteNotifyIO &io ) = 0;
     virtual void recycleSubscription ( 
         epicsGuard < epicsMutex > &, netSubscription &io ) = 0;
+protected:
+    virtual ~cacRecycle() {}
 };
 
 struct CASG;

src/ca/comBuf.h

@@ -49,6 +49,8 @@ public:
     virtual unsigned sendBytes ( const void * pBuf, 
         unsigned nBytesInBuf, 
         const class epicsTime & currentTime ) = 0;
+protected:
+    virtual ~wireSendAdapter() {}
 };
 
 enum swioCircuitState { 
@@ -67,6 +69,8 @@ class wireRecvAdapter { // X aCC 655
 public:
     virtual void recvBytes ( void * pBuf, 
         unsigned nBytesInBuf, statusWireIO & ) = 0;
+protected:
+    virtual ~wireRecvAdapter() {}
 };
 
 class comBuf : public tsDLNode < comBuf > {

src/ca/nciu.h

@@ -128,6 +128,8 @@ public:
     virtual arrayElementCount nativeElementCount ( 
         epicsGuard < epicsMutex > & ) const = 0;
     virtual bool connected ( epicsGuard < epicsMutex > & ) const = 0;
+protected:
+    virtual ~privateInterfaceForIO() {}
 };
 
 class nciu : 

src/cas/generic/casMonitor.h

@@ -44,6 +44,8 @@ public:
 	virtual caStatus casMonitorCallBack ( 
         epicsGuard < casClientMutex > &, casMonitor &,
         const gdd & ) = 0;
+protected:
+    virtual ~casMonitorCallbackInterface() {}
 };
 
 class casEvent;

src/cas/generic/chanIntfForPV.h

@@ -44,6 +44,8 @@ class gdd;
 class casChannelDestroyFromPV { // X aCC 655
 public:
     virtual void postDestroyEvent () = 0;
+protected:
+    virtual ~casChannelDestroyFromPV() {}
 };
 
 class chanIntfForPV : public tsDLNode < chanIntfForPV > {

src/cas/generic/inBuf.h

@@ -55,6 +55,8 @@ public:
     virtual fillCondition xRecv ( char *pBuf, bufSizeT nBytesToRecv, 
         enum fillParameter parm, bufSizeT &nByesRecv ) = 0;
     virtual void hostName ( char *pBuf, unsigned bufSize ) const = 0;
+protected:
+    virtual ~inBufClient() {}
 };
 
 class inBuf {

src/cas/generic/outBuf.h

@@ -53,6 +53,8 @@ public:
 	virtual flushCondition xSend ( char *pBuf, bufSizeT nBytesAvailableToSend, 
 		bufSizeT nBytesNeedToBeSent, bufSizeT &nBytesSent ) = 0;
 	virtual void hostName ( char *pBuf, unsigned bufSize ) const = 0;
+protected:
+    virtual ~outBufClient() {}
 };
 
 //

src/libCom/fdmgr/fdManager.h

@@ -35,7 +35,7 @@ enum fdRegType {fdrRead, fdrWrite, fdrException, fdrNEnums};
 //
 // file descriptor interest id
 //
-class epicsShareClass fdRegId  
+class epicsShareClass fdRegId
 {
 public:
 
@@ -60,6 +60,8 @@ public:
     resTableIndex hash () const;
 
     virtual void show (unsigned level) const;
+
+    virtual ~fdRegId() {}
 private:
     SOCKET fd;
     fdRegType type;

src/libCom/test/blockingSockTest.cpp

@@ -38,6 +38,8 @@ protected:
     epicsThreadId id;
     bool recvWakeup;
     bool sendWakeup;
+protected:
+    virtual ~circuit() {}
 };
 
 class serverCircuit : public circuit {