C++: Handle C and C++ versions of enum type definitions correctly (#62)

Il2CppInspector.Common/Cpp/CppType.cs

@@ -407,11 +407,15 @@ namespace Il2CppInspector.Cpp
         // Return the type as a field
         public override string ToFieldString(string fieldName) => "enum " + Name + " " + fieldName;
 
+        // Format specifier: 'c' = don't output C++-style enum with base type, use C-compatible code only
         public override string ToString(string format = "") {
             var sb = new StringBuilder();
             
             // Don't output " : {underlyingType.Name}" because it breaks C
-            sb.Append($"enum {Name} {{");
+            if (format.Contains('c'))
+                sb.Append($"enum {Name} {{");
+            else
+                sb.Append($"enum {Name} : {UnderlyingType.Name} {{");
 
             foreach (var field in Fields.Values.SelectMany(f => f))
                 sb.Append("\n    " + string.Join("\n    ", field.ToString(format).Split('\n')) + ",");

Il2CppInspector.Common/Outputs/CppScaffolding.cs

@@ -49,6 +49,8 @@ typedef __int64 int64_t;
 typedef __int{model.Package.BinaryImage.Bits} size_t;
 typedef size_t intptr_t;
 typedef size_t uintptr_t;
+#else
+#define _CPLUSPLUS_
 #endif
 ");
 
@@ -247,7 +249,16 @@ typedef size_t uintptr_t;
         private void writeTypesForGroup(string header, string group) {
             writeSectionHeader(header);
             foreach (var cppType in model.GetDependencyOrderedCppTypeGroup(group))
-                writeCode(cppType.ToString());
+                if (cppType is CppEnumType) {
+                    // Ghidra can't process C++ enum base types
+                    writeCode("#if defined(_CPLUSPLUS_)");
+                    writeCode(cppType.ToString());
+                    writeCode("#else");
+                    writeCode(cppType.ToString("c"));
+                    writeCode("#endif");
+                } else {
+                    writeCode(cppType.ToString());
+                }
         }
         
         private void writeCode(string text) {