Build pyauto on win

tools/swig/swig.py

 #!/usr/bin/python
 
 # Copyright (c) 2010 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.
 
 """Wrapper around swig.
 
 Sets the SWIG_LIB environment var to point to Lib dir
 and defers control to the platform-specific swig binary.
 
 Depends on swig binaries being available at ../../third_party/swig.
 """
 
 import os
+import subprocess
 import sys
 
 
 def main():
   swig_dir = os.path.abspath(os.path.join(os.path.dirname(sys.argv[0]),
                              os.pardir, os.pardir, 'third_party', 'swig'))
   lib_dir = os.path.join(swig_dir, "Lib")
   os.putenv("SWIG_LIB", lib_dir)
   dir_map = {
       'darwin': 'mac',
       'linux2': 'linux',
       'win32':  'win',
-      'cygwin': 'win',
+  }
+  # Swig documentation lies that platform macros are provided to swig
+  # preprocessor. Provide them ourselves.
+  platform_flags = {
+      'darwin': '-DSWIGMAC',
+      'linux2': '-DSWIGLINUX',
+      'win32':  '-DSWIGWIN',
   }
   swig_bin = os.path.join(swig_dir, dir_map[sys.platform], 'swig')
-  os.execv(swig_bin, [swig_bin] + sys.argv[1:])
+  args = [swig_bin, platform_flags[sys.platform]] + sys.argv[1:]
+  args = [x.replace('/', os.sep) for x in args]
+  print "Executing", args
+  sys.exit(subprocess.call(args))
 
 
 if __name__ == "__main__":
   main()