Index: /trunk/src/VBox/Main/src-server/SnapshotImpl.cpp
===================================================================
--- /trunk/src/VBox/Main/src-server/SnapshotImpl.cpp	(revision 52614)
+++ /trunk/src/VBox/Main/src-server/SnapshotImpl.cpp	(revision 52615)
@@ -1401,4 +1401,5 @@
                                             com::Utf8Str &aStateFilePath)
 {
+    NOREF(aInitiator);
     LogFlowThisFuncEnter();
 
Index: /trunk/src/VBox/Main/src-server/VirtualBoxImpl.cpp
===================================================================
--- /trunk/src/VBox/Main/src-server/VirtualBoxImpl.cpp	(revision 52614)
+++ /trunk/src/VBox/Main/src-server/VirtualBoxImpl.cpp	(revision 52615)
@@ -1764,5 +1764,4 @@
     HRESULT rc = S_OK;
     Guid id(aLocation);
-    const Guid cid = id;
     ComObjPtr<Medium> pMedium;
 
Index: /trunk/src/VBox/Main/src-server/linux/HostDnsServiceLinux.cpp
===================================================================
--- /trunk/src/VBox/Main/src-server/linux/HostDnsServiceLinux.cpp	(revision 52614)
+++ /trunk/src/VBox/Main/src-server/linux/HostDnsServiceLinux.cpp	(revision 52615)
@@ -146,4 +146,5 @@
             RT_ZERO(combo);
             ssize_t r = read(polls[0].fd, static_cast<void *>(&combo), sizeof(combo));
+            NOREF(r);
 
             if (combo.e.wd == wd[0])