scons: Add warning for overloaded virtual functions

Fix the ISA startup warnings

src/arch/alpha/isa.hh

@@ -108,6 +108,9 @@ namespace AlphaISA
         ISA(Params *p);
 
         void startup(ThreadContext *tc) {}
+
+        /// Explicitly import the otherwise hidden startup
+        using SimObject::startup;
     };
 }
 

src/arch/arm/isa.hh

@@ -195,6 +195,9 @@ namespace ArmISA
 
         void startup(ThreadContext *tc) {}
 
+        /// Explicitly import the otherwise hidden startup
+        using SimObject::startup;
+
         typedef ArmISAParams Params;
 
         const Params *params() const;

src/arch/mips/isa.hh

@@ -159,6 +159,9 @@ namespace MipsISA
       public:
         void startup(ThreadContext *tc) {}
 
+        /// Explicitly import the otherwise hidden startup
+        using SimObject::startup;
+
         const Params *params() const;
 
         ISA(Params *p);

src/arch/power/isa.hh

@@ -100,6 +100,9 @@ class ISA : public SimObject
 
     void startup(ThreadContext *tc) {}
 
+    /// Explicitly import the otherwise hidden startup
+    using SimObject::startup;
+
     const Params *params() const;
 
     ISA(Params *p);

src/arch/sparc/isa.hh

@@ -173,6 +173,9 @@ class ISA : public SimObject
 
     void startup(ThreadContext *tc) {}
 
+    /// Explicitly import the otherwise hidden startup
+    using SimObject::startup;
+
   protected:
 
     bool isHyperPriv() { return hpstate.hpriv; }

src/arch/x86/isa.hh

@@ -88,6 +88,10 @@ namespace X86ISA
         void serialize(std::ostream &os);
         void unserialize(Checkpoint *cp, const std::string &section);
         void startup(ThreadContext *tc);
+
+        /// Explicitly import the otherwise hidden startup
+        using SimObject::startup;
+
     };
 }