Support building selected C/C++ files in msvs-ninja

pylib/gyp/win_tool.py

 #!/usr/bin/env python
 
 # Copyright (c) 2012 Google Inc. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Utility functions for Windows builds.
 
 These functions are executed via gyp-win-tool when using the ninja generator.
 """
@@ skipping 281 matching lines @@
     env = self._GetEnv(arch)
     # TODO(scottmg): This is a temporary hack to get some specific variables
     # through to actions that are set after gyp-time. http://crbug.com/333738.
     for k, v in os.environ.iteritems():
       if k not in env:
         env[k] = v
     args = open(rspfile).read()
     dir = dir[0] if dir else None
     return subprocess.call(args, shell=True, env=env, cwd=dir)
 
+  def ExecClCompile(self, project_dir, selected_files):
+    """Executed by msvs-ninja projects when the 'ClCompile' target is used to
+    build selected C/C++ files."""
+    project_dir = os.path.relpath(project_dir, BASE_DIR)
+    selected_files = selected_files.split(';')
+    ninja_targets = [os.path.join(project_dir, filename) + '^^'
+        for filename in selected_files]
+    cmd = ['ninja.exe']
+    cmd.extend(ninja_targets)
+    return subprocess.call(cmd, shell=True, cwd=BASE_DIR)
+
 if __name__ == '__main__':
   sys.exit(main(sys.argv[1:]))