Cleaned up the additional parser options after parsing headers.

Signed-off-by: Dimitar Dobrev <dpldobrev@protonmail.com>

src/Generator/Driver.cs

@@ -126,19 +126,25 @@ namespace CppSharp
 
             if (Options.UnityBuild)
             {
-                var parserOptions = ParserOptions.BuildForSourceFile(Options.Modules);
+                using (var parserOptions = ParserOptions.BuildForSourceFile(
-                using (var result = parser.ParseSourceFiles(sourceFiles, parserOptions))
+                    Options.Modules))
+                {
+                    using (var result = parser.ParseSourceFiles(
+                        sourceFiles, parserOptions))
                         Context.TargetInfo = result.TargetInfo;
                     if (string.IsNullOrEmpty(ParserOptions.TargetTriple))
                         ParserOptions.TargetTriple = parserOptions.TargetTriple;
                 }
+            }
             else
             {
                 foreach (var sourceFile in sourceFiles)
                 {
-                    var parserOptions = ParserOptions.BuildForSourceFile(
+                    using (var parserOptions = ParserOptions.BuildForSourceFile(
-                        Options.Modules, sourceFile);
+                        Options.Modules, sourceFile))
-                    using (ParserResult result = parser.ParseSourceFile(sourceFile, parserOptions))
+                    {
+                        using (ParserResult result = parser.ParseSourceFile(
+                            sourceFile, parserOptions))
                             if (Context.TargetInfo == null)
                                 Context.TargetInfo = result.TargetInfo;
                             else
@@ -147,6 +153,7 @@ namespace CppSharp
                             ParserOptions.TargetTriple = parserOptions.TargetTriple;
                     }
                 }
+            }
 
             Context.ASTContext = ClangParser.ConvertASTContext(astContext);