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/dram_ctrl.hh b/src/mem/dram_ctrl.hh
index a7f3e5602..617c94914 100644
--- a/src/mem/dram_ctrl.hh
+++ b/src/mem/dram_ctrl.hh
@@ -868,14 +868,14 @@ class DRAMCtrl : public AbstractMemory
 
   public:
 
-    void regStats();
+    void regStats() override;
 
     DRAMCtrl(const DRAMCtrlParams* p);
 
     DrainState drain() override;
 
     virtual BaseSlavePort& getSlavePort(const std::string& if_name,
-                                        PortID idx = InvalidPortID);
+                                        PortID idx = InvalidPortID) override;
 
     virtual void init() override;
     virtual void startup() override;