Make root invocation less crazy so that multiprocessing works on Windows

pylib/gyp/input.py

 # 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.
 
 from compiler.ast import Const
 from compiler.ast import Dict
 from compiler.ast import Discard
 from compiler.ast import List
 from compiler.ast import Module
 from compiler.ast import Node
@@ skipping 2547 matching lines @@
   # well as meta-data (e.g. 'included_files' key). 'target_build_files' keeps
   # track of the keys corresponding to "target" files.
   data = {'target_build_files': set()}
   aux_data = {}
   for build_file in build_files:
     # Normalize paths everywhere.  This is important because paths will be
     # used as keys to the data dict and for references between input files.
     build_file = os.path.normpath(build_file)
     try:
       if parallel:
-        print >>sys.stderr, 'Using parallel processing.'
         LoadTargetBuildFileParallel(build_file, data, aux_data,
                                     variables, includes, depth, check)
       else:
         LoadTargetBuildFile(build_file, data, aux_data,
                             variables, includes, depth, check, True)
     except Exception, e:
       gyp.common.ExceptionAppend(e, 'while trying to load %s' % build_file)
       raise
 
   # Build a dict to access each target's subdict by qualified name.
@@ skipping 96 matching lines @@
     ValidateRunAsInTarget(target, target_dict, build_file)
     ValidateActionsInTarget(target, target_dict, build_file)
 
   # Generators might not expect ints.  Turn them into strs.
   TurnIntIntoStrInDict(data)
 
   # TODO(mark): Return |data| for now because the generator needs a list of
   # build files that came in.  In the future, maybe it should just accept
   # a list, and not the whole data dict.
   return [flat_list, targets, data]