diff --git a/src/ca/cac.cpp b/src/ca/cac.cpp
index 04e35a4c6..212d26b30 100644
--- a/src/ca/cac.cpp
+++ b/src/ca/cac.cpp
@@ -1405,9 +1405,10 @@ bool cac::readExcep ( epicsGuard < callbackMutex > &, tcpiiu &,
     return true;
 }
 
-bool cac::writeExcep ( epicsGuard < callbackMutex > &cbLocker, tcpiiu &, 
-                      const caHdrLargeArray &hdr, 
-                      const char *pCtx, unsigned status )
+bool cac::writeExcep ( epicsGuard < callbackMutex > &cbLocker, // X aCC 431
+                       tcpiiu &,
+                       const caHdrLargeArray &hdr, 
+                       const char *pCtx, unsigned status )
 {
     nciu * pChan = this->chanTable.lookup ( hdr.m_available );
     if ( pChan ) {
@@ -1475,8 +1476,9 @@ bool cac::exceptionRespAction ( epicsGuard < callbackMutex > & cbMutexIn, tcpiiu
     return ( this->*pStub ) ( cbMutexIn, iiu, req, pCtx, hdr.m_available );
 }
 
-bool cac::accessRightsRespAction ( epicsGuard < callbackMutex > & cbGuard, tcpiiu &, 
-                       const caHdrLargeArray &hdr, void * /* pMsgBdy */ )
+bool cac::accessRightsRespAction (
+        epicsGuard < callbackMutex > & cbGuard, tcpiiu &, // X aCC 431
+        const caHdrLargeArray &hdr, void * /* pMsgBdy */ )
 {
     nciu * pChan;
     {
@@ -1503,8 +1505,9 @@ bool cac::accessRightsRespAction ( epicsGuard < callbackMutex > & cbGuard, tcpii
     return true;
 }
 
-bool cac::claimCIURespAction ( epicsGuard < callbackMutex > &cbGuard, tcpiiu & iiu, 
-           const caHdrLargeArray & hdr, void * /*pMsgBdy */ )
+bool cac::claimCIURespAction (
+        epicsGuard < callbackMutex > &cbGuard, tcpiiu & iiu, // X aCC 431
+        const caHdrLargeArray & hdr, void * /* pMsgBdy */ )
 {
     nciu * pChan;
 
@@ -1553,9 +1556,10 @@ bool cac::verifyAndDisconnectChan (
     return true;
 }
 
-void cac::disconnectChannel ( epicsGuard < callbackMutex > & cbLocker,
-                                    epicsGuard < cacMutex > & locker,
-                                    nciu & chan )
+void cac::disconnectChannel (
+        epicsGuard < callbackMutex > & cbLocker, // X aCC 431
+        epicsGuard < cacMutex > & locker,
+        nciu & chan )
 {
     this->disconnectAllIO ( locker, chan, true );
     chan.disconnect ( *this->pudpiiu );
diff --git a/src/ca/cac.h b/src/ca/cac.h
index 77d400d06..066b14149 100644
--- a/src/ca/cac.h
+++ b/src/ca/cac.h
@@ -1,4 +1,3 @@
-
 /*  
  *  $Id$
  *
@@ -88,7 +87,7 @@ private:
     epicsMutex mutex;
 };
 
-class cacDisconnectChannelPrivate {
+class cacDisconnectChannelPrivate { // X aCC 655
 public:
     virtual void disconnectChannel ( 
         epicsGuard < callbackMutex > &, 
diff --git a/src/ca/comBuf.cpp b/src/ca/comBuf.cpp
index bb1dbd957..60c24c9b6 100644
--- a/src/ca/comBuf.cpp
+++ b/src/ca/comBuf.cpp
@@ -1,4 +1,3 @@
-
 /*  
  *  $Id$
  *
@@ -119,4 +118,4 @@ unsigned comBuf::push ( const epicsFloat64 *pValue, unsigned nElem )
 void comBuf::throwInsufficentBytesException ()
 {
     throw insufficentBytesAvailable ();
-}
\ No newline at end of file
+}
diff --git a/src/ca/comBuf.h b/src/ca/comBuf.h
index c091f305c..3a5d03211 100644
--- a/src/ca/comBuf.h
+++ b/src/ca/comBuf.h
@@ -201,6 +201,7 @@ inline bool comBuf::push ( const epicsInt16 & value )
         static_cast < epicsUInt8 > ( value >> 8u );
     this->buf[this->nextWriteIndex++] = 
         static_cast < epicsUInt8 > ( value >> 0u );
+    return true;
 }
 
 inline bool comBuf::push ( const epicsUInt16 & value )
diff --git a/src/ca/netIO.h b/src/ca/netIO.h
index b532de755..6a7a04b45 100644
--- a/src/ca/netIO.h
+++ b/src/ca/netIO.h
@@ -1,4 +1,3 @@
-
 /*  
  *  $Id$
  *
@@ -33,7 +32,7 @@
 #   define NETIO_PLACEMENT_DELETE
 #endif
 
-class baseNMIU : public tsDLNode < baseNMIU >, 
+class baseNMIU : public tsDLNode < baseNMIU >, // X aCC 655
         public chronIntIdRes < baseNMIU > {
 public:
     baseNMIU ( nciu &chan );
diff --git a/src/ca/netReadNotifyIO.cpp b/src/ca/netReadNotifyIO.cpp
index d24cf2e44..709d48e5e 100644
--- a/src/ca/netReadNotifyIO.cpp
+++ b/src/ca/netReadNotifyIO.cpp
@@ -1,5 +1,5 @@
-
-/*  $Id$
+/*
+ *  $Id$
  *
  *                    L O S  A L A M O S
  *              Los Alamos National Laboratory
@@ -27,7 +27,7 @@ netReadNotifyIO::~netReadNotifyIO ()
 {
 }
 
-void netReadNotifyIO::show ( unsigned level ) const
+void netReadNotifyIO::show ( unsigned /* level */ ) const
 {
     ::printf ( "read notify IO at %p\n", 
         static_cast < const void * > ( this ) );
diff --git a/src/ca/netSubscription.cpp b/src/ca/netSubscription.cpp
index f2470d940..f52310fcf 100644
--- a/src/ca/netSubscription.cpp
+++ b/src/ca/netSubscription.cpp
@@ -1,5 +1,5 @@
-
-/*  $Id$
+/*
+ *  $Id$
  *
  *                    L O S  A L A M O S
  *              Los Alamos National Laboratory
@@ -49,7 +49,7 @@ class netSubscription * netSubscription::isSubscription ()
     return this;
 }
 
-void netSubscription::show ( unsigned level ) const
+void netSubscription::show ( unsigned /* level */ ) const
 {
     ::printf ( "event subscription IO at %p, type %s, element count %lu, mask %u\n", 
         static_cast < const void * > ( this ), 
diff --git a/src/ca/netWriteNotifyIO.cpp b/src/ca/netWriteNotifyIO.cpp
index c2f51fe7f..917cd1073 100644
--- a/src/ca/netWriteNotifyIO.cpp
+++ b/src/ca/netWriteNotifyIO.cpp
@@ -1,5 +1,5 @@
-
-/*  $Id$
+/*
+ *  $Id$
  *
  *                    L O S  A L A M O S
  *              Los Alamos National Laboratory
@@ -27,7 +27,7 @@ netWriteNotifyIO::~netWriteNotifyIO ()
 {
 }
 
-void netWriteNotifyIO::show ( unsigned level ) const
+void netWriteNotifyIO::show ( unsigned /* level */ ) const
 {
     ::printf ( "read write notify IO at %p\n", 
         static_cast < const void * > ( this ) );
diff --git a/src/ca/udpiiu.cpp b/src/ca/udpiiu.cpp
index 9315a1f52..4d3fff4a3 100644
--- a/src/ca/udpiiu.cpp
+++ b/src/ca/udpiiu.cpp
@@ -528,9 +528,9 @@ bool udpiiu::noopAction ( epicsGuard < callbackMutex > &,
     return true;
 }
 
-bool udpiiu::searchRespAction ( epicsGuard < callbackMutex > & cbLocker,
-                                const caHdr &msg, // X aCC 361
-                                const osiSockAddr &addr, const epicsTime &currentTime )
+bool udpiiu::searchRespAction ( // X aCC 361
+        epicsGuard < callbackMutex > & cbLocker, const caHdr &msg,
+        const osiSockAddr &addr, const epicsTime &currentTime )
 {
     osiSockAddr serverAddr;
     unsigned minorVersion;