Use a shorter include paths on Windows.

webkit/support/setup_third_party.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.
 
 """A helper script for setting up forwarding headers."""
 
 import errno
 import os
 import sys
@@ skipping 85 matching lines @@
   out_filename = NormalizePath(out_filename)
   ancestor = os.path.commonprefix([input_filename, out_filename])
 
   assert os.path.isdir(ancestor)
   num_parent_dirs = 0
   out_dir = os.path.split(out_filename)[0]
   while os.path.normpath(ancestor) != os.path.normpath(out_dir):
     num_parent_dirs += 1
     out_dir = os.path.split(out_dir)[0]
 
-  rel_path = os.path.join('/'.join(['..'] * num_parent_dirs),
-                          input_filename[len(ancestor):])
+  if sys.platform == 'win32':
+    # Windows has a file path limit of 260 characters that we can hit when

[M-A Ruel, 2011/12/15 01:19:37]

Why not do the same on all platforms?

+    # generating these forwarding headers.  Instead of writing the full
+    # relative path, just write the path relative to the WebKit/chromium dir,
+    # which is in the include path.
+    rel_path = input_filename[len(ancestor):]
+  else:
+    rel_path = os.path.join('/'.join(['..'] * num_parent_dirs),
+                            input_filename[len(ancestor):])
 
   out_file = open(out_filename, 'w')
   out_file.write("""// This file is generated.  Do not edit.
 #include "%s"
 """ % rel_path)
   out_file.close()
 
 
 def Main(argv):
   commands = {
     'inputs': Inputs,
     'outputs': Outputs,
     'setup_headers': SetupHeaders,
   }
   command = argv[1]
   args = argv[2:]
   return commands[command](args)
 
 
 if __name__ == '__main__':
   sys.exit(Main(sys.argv))