Resolved issues with virtual function inheritance and warning from clang

Also removed __GNUC__ conditional compilation statements which are no
longer needed.

src/thermophysicalModels/basic/heThermo/heThermo.C

@@ -799,6 +799,60 @@ Foam::heThermo<BasicThermo, MixtureType>::alphaEff
 }
 
 
+template<class BasicThermo, class MixtureType>
+Foam::scalar
+Foam::heThermo<BasicThermo, MixtureType>::Cp
+(
+    const label speciei,
+    const scalar p,
+    const scalar T
+) const
+{
+    notImplemented
+    (
+        "heThermo<BasicThermo, MixtureType>::"
+        "Cp(const label speciei, const scalar p, const scalar T)"
+    );
+    return 0;
+}
+
+
+template<class BasicThermo, class MixtureType>
+Foam::scalar
+Foam::heThermo<BasicThermo, MixtureType>::Cv
+(
+    const label speciei,
+    const scalar p,
+    const scalar T
+) const
+{
+    notImplemented
+    (
+        "heThermo<BasicThermo, MixtureType>::"
+        "Cv(const label speciei, const scalar p, const scalar T)"
+    );
+    return 0;
+}
+
+
+template<class BasicThermo, class MixtureType>
+Foam::scalar
+Foam::heThermo<BasicThermo, MixtureType>::kappa
+(
+    const label speciei,
+    const scalar p,
+    const scalar T
+) const
+{
+    notImplemented
+    (
+        "heThermo<BasicThermo, MixtureType>::"
+        "kappa(const label speciei, const scalar p, const scalar T)"
+    );
+    return 0;
+}
+
+
 template<class BasicThermo, class MixtureType>
 bool Foam::heThermo<BasicThermo, MixtureType>::read()
 {

src/thermophysicalModels/basic/heThermo/heThermo.H

@@ -292,6 +292,34 @@ public:
             ) const;
 
 
+        // Dummy per-specie thermo properties to avoid problems
+        // with virtual function inheritance
+
+            //- Heat capacity at constant pressure [J/(kg K)]
+            virtual scalar Cp
+            (
+                const label speciei,
+                const scalar p,
+                const scalar T
+            ) const;
+
+            //- Heat capacity at constant volume [J/(kg K)]
+            virtual scalar Cv
+            (
+                const label speciei,
+                const scalar p,
+                const scalar T
+            ) const;
+
+            //- Thermal conductivity [W/m/K]
+            virtual scalar kappa
+            (
+                const label speciei,
+                const scalar p,
+                const scalar T
+            ) const;
+
+
         //- Read thermophysical properties dictionary
         virtual bool read();
 };