scons: Add warning for overloaded virtual functions

A derived function with a different signature than a base class
function will result in the base class function of the same name being
hidden. The parameter list and return type for the member function in
the derived class must match those of the member function in the base
class, otherwise the function in the derived class will hide the
function in the base class and no polymorphic behaviour will occur.

This patch addresses these warnings by ensuring a unique function name
to avoid (unintentionally) hiding any functions.

src/arch/mips/isa/formats/branch.isa

@@ -91,6 +91,9 @@ output header {{
 
         MipsISA::PCState branchTarget(const MipsISA::PCState &branchPC) const;
 
+        /// Explicitly import the otherwise hidden branchTarget
+        using StaticInst::branchTarget;
+
         std::string
         generateDisassembly(Addr pc, const SymbolTable *symtab) const;
     };
@@ -118,6 +121,9 @@ output header {{
 
         MipsISA::PCState branchTarget(ThreadContext *tc) const;
 
+        /// Explicitly import the otherwise hidden branchTarget
+        using StaticInst::branchTarget;
+
         std::string
         generateDisassembly(Addr pc, const SymbolTable *symtab) const;
     };

src/arch/mips/process.hh

@@ -53,6 +53,8 @@ class MipsLiveProcess : public LiveProcess
 
   public:
     MipsISA::IntReg getSyscallArg(ThreadContext *tc, int &i);
+    /// Explicitly import the otherwise hidden getSyscallArg
+    using LiveProcess::getSyscallArg;
     void setSyscallArg(ThreadContext *tc, int i, MipsISA::IntReg val);
     void setSyscallReturn(ThreadContext *tc, SyscallReturn return_value);
 };