[cli] Added a new -A option to pass compiler arguments to Clang parser.

src/CLI/CLI.cs

@@ -18,6 +18,7 @@ namespace CppSharp
             optionSet.Add("l=", "{LIBRARY} that that contains the symbols of the generated code", l => options.Libraries.Add(l) );
             optionSet.Add("L=", "the {PATH} of a folder to search for additional libraries", l => options.LibraryDirs.Add(l) );
             optionSet.Add("D:", "additional define with (optional) value to add to be used while parsing the given header files", (n, v) => AddDefine(n, v, messages) );
+            optionSet.Add("A=", "additional Clang arguments to pass to the compiler while parsing the given header files", (v) => AddArgument(v, messages) );
 
             optionSet.Add("o=|output=", "the {PATH} for the generated bindings file (doesn't need the extension since it will depend on the generator)", v => HandleOutputArg(v, messages) );
             optionSet.Add("on=|outputnamespace=", "the {NAMESPACE} that will be used for the generated code", on => options.OutputNamespace = on );
@@ -116,6 +117,14 @@ namespace CppSharp
             }
         }
 
+        static void AddArgument(string value, List<string> messages)
+        {
+            if (value == null)
+                messages.Add("Invalid compiler argument name for option -A.");
+            else
+                options.Arguments.Add(value);
+        }
+
         static void AddDefine(string name, string value, List<string> messages)
         {
             if (name == null)

src/CLI/Generator.cs

@@ -157,7 +157,10 @@ namespace CppSharp
 
             if (triple.Contains("linux"))
                 SetupLinuxOptions(parserOptions);
-            
+
+            foreach (string s in options.Arguments)
+                parserOptions.AddArguments(s);
+
             foreach (string s in options.IncludeDirs)
                 parserOptions.AddIncludeDirs(s);
 

src/CLI/Options.cs

@@ -19,6 +19,8 @@ namespace CppSharp
 
         public List<string> Libraries { get; } = new List<string>();
 
+        public List<string> Arguments { get; } = new List<string>();
+
         public Dictionary<string, string> Defines { get; } = new Dictionary<string, string>();
 
         public string OutputDir { get; set; }