From d854c36426d3018fb504fee0a8b8414e07a18362 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jo=C3=A3o=20Matos?= <ripzonetriton@gmail.com>
Date: Sat, 18 Aug 2012 14:49:57 +0100
Subject: [PATCH] Expose function to get Windows system include paths.

---
 include/clang/Driver/Util.h     |  5 ++++
 lib/Driver/WindowsToolChain.cpp | 56 +++++++++++++++++++++++++----------------
 2 files changed, 39 insertions(+), 22 deletions(-)

diff --git a/include/clang/Driver/Util.h b/include/clang/Driver/Util.h
index 65aef4b..8e09585 100644
--- a/include/clang/Driver/Util.h
+++ b/include/clang/Driver/Util.h
@@ -11,6 +11,8 @@
 #define CLANG_DRIVER_UTIL_H_
 
 #include "clang/Basic/LLVM.h"
+#include <string>
+#include <vector>
 
 namespace clang {
 namespace driver {
@@ -22,6 +24,9 @@ namespace driver {
   /// ActionList - Type used for lists of actions.
   typedef SmallVector<Action*, 3> ActionList;
 
+  /// Gets the default Windows system include directories.
+  std::vector<std::string> GetWindowsSystemIncludeDirs();
+
 } // end namespace driver
 } // end namespace clang
 
diff --git a/lib/Driver/WindowsToolChain.cpp b/lib/Driver/WindowsToolChain.cpp
index 6827034..aba248d 100644
--- a/lib/Driver/WindowsToolChain.cpp
+++ b/lib/Driver/WindowsToolChain.cpp
@@ -14,6 +14,7 @@
 #include "clang/Driver/Compilation.h"
 #include "clang/Driver/Driver.h"
 #include "clang/Driver/Options.h"
+#include "clang/Driver/Util.h"
 #include "clang/Basic/Version.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/Path.h"
@@ -304,19 +305,8 @@ static bool getVisualStudioDir(std::string &path) {
 
 #endif // _MSC_VER
 
-void Windows::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
-                                        ArgStringList &CC1Args) const {
-  if (DriverArgs.hasArg(options::OPT_nostdinc))
-    return;
-
-  if (!DriverArgs.hasArg(options::OPT_nobuiltininc)) {
-    llvm::sys::Path P(getDriver().ResourceDir);
-    P.appendComponent("include");
-    addSystemInclude(DriverArgs, CC1Args, P.str());
-  }
-
-  if (DriverArgs.hasArg(options::OPT_nostdlibinc))
-    return;
+std::vector<std::string> clang::driver::GetWindowsSystemIncludeDirs() {
+  std::vector<std::string> Paths;
 
 #ifdef _MSC_VER
   // Honor %INCLUDE%. It should know essential search paths with vcvarsall.bat.
@@ -330,9 +320,9 @@ void Windows::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
       if (d.size() == 0)
         continue;
       ++n;
-      addSystemInclude(DriverArgs, CC1Args, d);
+      Paths.push_back(d);
     }
-    if (n) return;
+    if (n) return Paths;
   }
 
   std::string VSDir;
@@ -341,25 +331,47 @@ void Windows::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
   // When built with access to the proper Windows APIs, try to actually find
   // the correct include paths first.
   if (getVisualStudioDir(VSDir)) {
-    addSystemInclude(DriverArgs, CC1Args, VSDir + "\\VC\\include");
+    Paths.push_back(VSDir + "\\VC\\include");
     if (getWindowsSDKDir(WindowsSDKDir))
-      addSystemInclude(DriverArgs, CC1Args, WindowsSDKDir + "\\include");
+      Paths.push_back(WindowsSDKDir + "\\include");
     else
-      addSystemInclude(DriverArgs, CC1Args,
-                       VSDir + "\\VC\\PlatformSDK\\Include");
-    return;
+      Paths.push_back(VSDir + "\\VC\\PlatformSDK\\Include");
+    return Paths;
   }
 #endif // _MSC_VER
 
   // As a fallback, select default install paths.
-  const StringRef Paths[] = {
+  const StringRef FallbackPaths[] = {
     "C:/Program Files/Microsoft Visual Studio 10.0/VC/include",
     "C:/Program Files/Microsoft Visual Studio 9.0/VC/include",
     "C:/Program Files/Microsoft Visual Studio 9.0/VC/PlatformSDK/Include",
     "C:/Program Files/Microsoft Visual Studio 8/VC/include",
     "C:/Program Files/Microsoft Visual Studio 8/VC/PlatformSDK/Include"
   };
-  addSystemIncludes(DriverArgs, CC1Args, Paths);
+
+  for (int i = 0; i < sizeof(FallbackPaths) / sizeof(FallbackPaths[0]); ++i)
+    Paths.push_back(Paths[i]);
+
+  return Paths;
+}
+
+void Windows::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
+                                        ArgStringList &CC1Args) const {
+  if (DriverArgs.hasArg(options::OPT_nostdinc))
+    return;
+
+  if (!DriverArgs.hasArg(options::OPT_nobuiltininc)) {
+    llvm::sys::Path P(getDriver().ResourceDir);
+    P.appendComponent("include");
+    addSystemInclude(DriverArgs, CC1Args, P.str());
+  }
+
+  if (DriverArgs.hasArg(options::OPT_nostdlibinc))
+    return;
+
+  std::vector<std::string> Paths = driver::GetWindowsSystemIncludeDirs();
+  for (size_t i = 0; i < Paths.size(); ++i)
+    addSystemInclude(DriverArgs, CC1Args, Paths[i]);
 }
 
 void Windows::AddClangCXXStdlibIncludeArgs(const ArgList &DriverArgs,
-- 
1.7.11