Clean up build warnings from Darwin (clang).

src/ca/client/iocinf.h

@@ -63,9 +63,7 @@ static const unsigned contiguousMsgCountWhichTriggersFlowControl = 10u;
 
 class caErrorCode { 
 public:
-    caErrorCode ( int status ) : code ( status ) {};
-private:
-    int code;
+    caErrorCode ( int ) {};
 };
 
 /*

src/ca/client/oldAccess.h

@@ -591,7 +591,7 @@ void ca_client_context :: whenThereIsAnExceptionDestroySyncGroupIO (
     }
     else {
         // dont reverse the lock hierarchy
-        epicsGuardRelease < epicsMutex > guardRelease ();
+        epicsGuardRelease < epicsMutex > guardRelease ( guard );
         {
             //
             // we will definately stall out here if all of the

src/ca/client/tcpiiu.cpp

@@ -44,8 +44,10 @@
 
 using namespace std;
 
+#if 0
 const unsigned mSecPerSec = 1000u;
 const unsigned uSecPerSec = 1000u * mSecPerSec;
+#endif
 
 tcpSendThread::tcpSendThread ( 
         class tcpiiu & iiuIn, const char * pName, 

src/ca/legacy/pcas/generic/casStrmClient.cc

@@ -34,8 +34,6 @@ const nothrow_t  nothrow ;
 }
 #endif
 
-static const caHdr nill_msg = { 0u, 0u, 0u, 0u, 0u, 0u };
-
 casStrmClient::pCASMsgHandler const casStrmClient::msgHandlers[] =
 {
     & casStrmClient::versionAction,