Implemented Clang's MSVC toolchain lookup mode with `ForceClangToolchainLookup`.

src/CppParser/Parser.cpp

@@ -49,7 +49,7 @@
 #include <CodeGen/CGCall.h>
 #include <CodeGen/CGCXXABI.h>
 #include <Driver/ToolChains/Linux.h>
-
+#include <Driver/ToolChains/MSVC.h>
 
 #if defined(__APPLE__) || defined(__linux__)
 #ifndef _GNU_SOURCE
@@ -347,13 +347,18 @@ void Parser::Setup()
     clang::driver::Driver D("", TO->Triple, c->getDiagnostics());
     clang::driver::ToolChain *TC = nullptr;
     llvm::Triple Target(TO->Triple);
+
     switch (Target.getOS()) {
-    // Extend this for other triples if needed, see clang's Driver::getToolChain.
     case llvm::Triple::Linux:
       TC = new clang::driver::toolchains::Linux(D, Target, Args);
       break;
-    default:
-      break;
+    case llvm::Triple::Win32:
+        switch (Target.getEnvironment()) {
+        case llvm::Triple::MSVC:
+            TC = new clang::driver::toolchains::MSVCToolChain(D, Target, Args);
+            break;
+        }
+        break;
     }
 
     if (TC && !opts->noStandardIncludes) {

src/Parser/ParserOptions.cs

@@ -197,21 +197,25 @@ namespace CppSharp.Parser
         public void SetupMSVC(VisualStudioVersion vsVersion)
         {
             MicrosoftMode = true;
-            NoBuiltinIncludes = true;
-            NoStandardIncludes = true;
             Abi = CppAbi.Microsoft;
 
-            vsVersion = MSVCToolchain.FindVSVersion(vsVersion);
-            foreach (var include in MSVCToolchain.GetSystemIncludes(vsVersion))
-                AddSystemIncludeDirs(include);
+            var clVersion = MSVCToolchain.GetCLVersion(vsVersion);
+            ToolSetToUse = clVersion.Major * 10000000 + clVersion.Minor * 100000;
+
+            if (!ForceClangToolchainLookup)
+            {
+                NoStandardIncludes = true;
+                NoBuiltinIncludes = true;
+
+                vsVersion = MSVCToolchain.FindVSVersion(vsVersion);
+                foreach (var include in MSVCToolchain.GetSystemIncludes(vsVersion))
+                    AddSystemIncludeDirs(include);
+            }
 
             // do not remove the CppSharp prefix becase the Mono C# compiler breaks
             if (!LanguageVersion.HasValue)
                 LanguageVersion = CppSharp.Parser.LanguageVersion.CPP14_GNU;
 
-            var clVersion = MSVCToolchain.GetCLVersion(vsVersion);
-            ToolSetToUse = clVersion.Major * 10000000 + clVersion.Minor * 100000;
-
             AddArguments("-fms-extensions");
             AddArguments("-fms-compatibility");
             AddArguments("-fdelayed-template-parsing");