[NaCl SDK] Use subst to keep path lengths short on the buildbots.

native_client_sdk/src/build_tools/build_sdk.py

 #!/usr/bin/env python
 # 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.
 
 """Entry point for both build and try bots.
 
 This script is invoked from XXX, usually without arguments
 to package an SDK. It automatically determines whether
 this SDK is for mac, win, linux.
@@ skipping 38 matching lines @@
 sys.path.append(os.path.join(NACL_DIR, 'build'))
 
 import getos
 import oshelpers
 
 CYGTAR = os.path.join(NACL_DIR, 'build', 'cygtar.py')
 
 NACLPORTS_URL = 'https://naclports.googlecode.com/svn/trunk/src'
 NACLPORTS_REV = 757
 
-# TODO(binji): horrible hack to make the Windows builders go green...
-# Windows has a path length limit of 255 characters, after joining cwd with a
-# relative path. Some of the Windows builders are over by just a little bit, so
-# we'll temporarily use a shorter build directory name to make it all work.
-# See http://crbug.com/245453
-GYPBUILD_DIR = 'gb'  # Was 'gypbuild'
+GYPBUILD_DIR = 'gypbuild'
 
 options = None
 
 
 def GetGlibcToolchain(platform, arch):
   tcdir = os.path.join(NACL_DIR, 'toolchain', '.tars')
   tcname = 'toolchain_%s_%s.tar.bz2' % (platform, arch)
   return os.path.join(tcdir, tcname)
 
 
@@ skipping 899 matching lines @@
     BuildStepArchiveSDKTools()
 
   return 0
 
 
 if __name__ == '__main__':
   try:
     sys.exit(main(sys.argv))
   except KeyboardInterrupt:
     buildbot_common.ErrorExit('build_sdk: interrupted')