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, 4 insertions, 4 deletions

diff --git a/src/cpu/base.hh b/src/cpu/base.hh
index 554c4d754..87f27acca 100644
--- a/src/cpu/base.hh
+++ b/src/cpu/base.hh
@@ -189,7 +189,7 @@ class BaseCPU : public MemObject
      * @return a reference to the port with the given name
      */
     BaseMasterPort &getMasterPort(const std::string &if_name,
-                                  PortID idx = InvalidPortID);
+                                  PortID idx = InvalidPortID) override;
 
     /** Get cpu task id */
     uint32_t taskId() const { return _taskId; }
@@ -303,9 +303,9 @@ class BaseCPU : public MemObject
     BaseCPU(Params *params, bool is_checker = false);
     virtual ~BaseCPU();
 
-    virtual void init();
-    virtual void startup();
-    virtual void regStats();
+    void init() override;
+    void startup() override;
+    void regStats() override;
 
     void regProbePoints() override;