Added an option to enable or disable RTTI (#892)

Fixes #819

src/CppParser/Parser.cpp

@@ -269,7 +269,6 @@ void Parser::SetupHeader()
         args.push_back(opts->microsoftMode ? "-std=gnu++14" : "-std=gnu++11");
         break;
     }
-    args.push_back("-fno-rtti");
 
     for (unsigned I = 0, E = opts->Arguments.size(); I != E; ++I)
     {

src/Generator/Driver.cs

@@ -65,7 +65,7 @@ namespace CppSharp
         public void Setup()
         {
             ValidateOptions();
-            ParserOptions.SetupIncludes();
+            ParserOptions.Setup();
             Context = new BindingContext(Options, ParserOptions);
             Context.TypeMaps.SetupTypeMaps(Options.GeneratorKind);
             Generator = CreateGeneratorFromKind(Options.GeneratorKind);

src/Parser/ParserOptions.cs

@@ -14,6 +14,7 @@ namespace CppSharp.Parser
 
         public bool IsItaniumLikeAbi { get { return Abi != CppAbi.Microsoft; } }
         public bool IsMicrosoftAbi { get { return Abi == CppAbi.Microsoft; } }
+        public bool EnableRtti { get; set; }
 
         /// Sets up the parser options to work with the given Visual Studio toolchain.
         public void SetupMSVC()
@@ -72,12 +73,24 @@ namespace CppSharp.Parser
             AddArguments("-stdlib=libc++");
         }
 
-        public void SetupIncludes()
+        public void Setup()
+        {
+            SetupArguments();
+            SetupIncludes();
+        }
+
+        private void SetupIncludes()
         {
             if (Platform.IsMacOS)
                 SetupXcode();
             else if (Platform.IsWindows && !NoBuiltinIncludes)
                 SetupMSVC();
         }
+
+        private void SetupArguments()
+        {
+            if (!EnableRtti)
+                AddArguments("-fno-rtti");
+        }
     }
 }