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, 5 insertions, 4 deletions

diff --git a/src/arch/alpha/process.hh b/src/arch/alpha/process.hh
index cd45871b1..fcaa6539c 100644
--- a/src/arch/alpha/process.hh
+++ b/src/arch/alpha/process.hh
@@ -43,16 +43,17 @@ class AlphaLiveProcess : public LiveProcess
     AlphaLiveProcess(LiveProcessParams *params, ObjectFile *objFile);
 
     void loadState(CheckpointIn &cp) override;
-    void initState();
+    void initState() override;
 
     void argsInit(int intSize, int pageSize);
 
   public:
-    AlphaISA::IntReg getSyscallArg(ThreadContext *tc, int &i);
+    AlphaISA::IntReg getSyscallArg(ThreadContext *tc, int &i) override;
     /// Explicitly import the otherwise hidden getSyscallArg
     using LiveProcess::getSyscallArg;
-    void setSyscallArg(ThreadContext *tc, int i, AlphaISA::IntReg val);
-    void setSyscallReturn(ThreadContext *tc, SyscallReturn return_value);
+    void setSyscallArg(ThreadContext *tc, int i, AlphaISA::IntReg val) override;
+    void setSyscallReturn(ThreadContext *tc,
+                          SyscallReturn return_value) override;
 };
 
 /* No architectural page table defined for this ISA */