Build the Clang plugin on Windows.

tools/clang/plugins/ChromeClassTester.cpp

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // A general interface for filtering and only acting on classes in Chromium C++
 // code.
 
 #include "ChromeClassTester.h"
 
+#include <algorithm>
+
 #include "clang/AST/AST.h"
 #include "clang/Basic/FileManager.h"
 #include "clang/Basic/SourceManager.h"
 
 #ifdef LLVM_ON_UNIX
 #include <sys/param.h>
 #endif
 
 using namespace clang;
 
@@ skipping 205 matching lines @@
       return GetNamespaceImpl(context->getParent(),
                               OS.str());
     }
     default: {
       return GetNamespaceImpl(context->getParent(), candidate);
     }
   }
 }
 
 bool ChromeClassTester::InBannedDirectory(SourceLocation loc) {
+  if (instance().getSourceManager().isInSystemHeader(loc))
+    return true;
+
   std::string filename;
   if (!GetFilename(loc, &filename)) {
     // If the filename cannot be determined, simply treat this as a banned
     // location, instead of going through the full lookup process.
     return true;
   }
 
   // We need to special case scratch space; which is where clang does its
   // macro expansion. We explicitly want to allow people to do otherwise bad
   // things through macros that were defined due to third party libraries.
   if (filename == "<scratch space>")
     return true;
 
   // Don't complain about autogenerated protobuf files.
   if (ends_with(filename, ".pb.h")) {
     return true;
   }
 
-#ifdef LLVM_ON_UNIX
+#if defined(LLVM_ON_UNIX)
   // We need to munge the paths so that they are relative to the repository
   // srcroot. We first resolve the symlinktastic relative path and then
   // remove our known srcroot from it if needed.
   char resolvedPath[MAXPATHLEN];
   if (realpath(filename.c_str(), resolvedPath)) {
     filename = resolvedPath;
   }
 #endif
 
+#if defined(LLVM_ON_WIN32)
+  std::replace(filename.begin(), filename.end(), '\\', '/');
+#endif
+
   for (const std::string& banned_dir : banned_directories_) {
     // If any of the banned directories occur as a component in filename,
     // this file is rejected.
     assert(banned_dir.front() == '/' && "Banned dir must start with '/'");
     assert(banned_dir.back() == '/' && "Banned dir must end with '/'");
 
     if (filename.find(banned_dir) != std::string::npos)
       return true;
   }
 
@@ skipping 11 matching lines @@
   PresumedLoc ploc = source_manager.getPresumedLoc(spelling_location);
   if (ploc.isInvalid()) {
     // If we're in an invalid location, we're looking at things that aren't
     // actually stated in the source.
     return false;
   }
 
   *filename = ploc.getFilename();
   return true;
 }