misc: Add explicit overrides and fix other clang >= 3.5 issues

This patch adds explicit overrides as this is now required when using
"-Wall" with clang >= 3.5, the latter now part of the most recent
XCode. The patch consequently removes "virtual" for those methods
where "override" is added. The latter should be enough of an
indication.

As part of this patch, a few minor issues that clang >= 3.5 complains
about are also resolved (unused methods and variables).

1 files changed, 2 insertions, 2 deletions

diff --git a/src/mem/ruby/system/DMASequencer.hh b/src/mem/ruby/system/DMASequencer.hh
index 1d5451f6e..34f9be34c 100644
--- a/src/mem/ruby/system/DMASequencer.hh
+++ b/src/mem/ruby/system/DMASequencer.hh
@@ -60,7 +60,7 @@ class DMASequencer : public MemObject
   public:
     typedef DMASequencerParams Params;
     DMASequencer(const Params *);
-    void init();
+    void init() override;
     RubySystem *m_ruby_system;
 
   public:
@@ -95,7 +95,7 @@ class DMASequencer : public MemObject
     };
 
     BaseSlavePort &getSlavePort(const std::string &if_name,
-                                PortID idx = InvalidPortID);
+                                PortID idx = InvalidPortID) override;
 
     /* external interface */
     RequestStatus makeRequest(PacketPtr pkt);