.close() build.ninja in ninja generator

pylib/gyp/generator/ninja.py

 # Copyright (c) 2013 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.
 
 import copy
 import hashlib
 import json
 import multiprocessing
 import os.path
 import re
@@ skipping 1638 matching lines @@
   flavor = gyp.common.GetFlavor(params)
   generator_flags = params.get('generator_flags', {})
 
   # build_dir: relative path from source root to our output files.
   # e.g. "out/Debug"
   build_dir = os.path.normpath(
       os.path.join(ComputeOutputDir(params), config_name))
 
   toplevel_build = os.path.join(options.toplevel_dir, build_dir)
 
-  master_ninja = ninja_syntax.Writer(
-      OpenOutput(os.path.join(toplevel_build, 'build.ninja')),
-      width=120)
+  master_ninja_file = OpenOutput(os.path.join(toplevel_build, 'build.ninja'))
+  master_ninja = ninja_syntax.Writer(master_ninja_file, width=120)
 
   # Put build-time support tools in out/{config_name}.
   gyp.common.CopyTool(flavor, toplevel_build)
 
   # Grab make settings for CC/CXX.
   # The rules are
   # - The priority from low to high is gcc/g++, the 'make_global_settings' in
   #   gyp, the environment variable.
   # - If there is no 'make_global_settings' for CC.host/CXX.host or
   #   'CC_host'/'CXX_host' enviroment variable, cc_host/cxx_host should be set
@@ skipping 419 matching lines @@
     master_ninja.comment('Short names for targets.')
     for short_name in target_short_names:
       master_ninja.build(short_name, 'phony', [x.FinalOutput() for x in
                                                target_short_names[short_name]])
 
   if all_outputs:
     master_ninja.newline()
     master_ninja.build('all', 'phony', list(all_outputs))
     master_ninja.default(generator_flags.get('default_target', 'all'))
 
+  master_ninja_file.close()
+
 
 def PerformBuild(data, configurations, params):
   options = params['options']
   for config in configurations:
     builddir = os.path.join(options.toplevel_dir, 'out', config)
     arguments = ['ninja', '-C', builddir]
     print 'Building [%s]: %s' % (config, arguments)
     subprocess.check_call(arguments)
 
 
@@ skipping 30 matching lines @@
           arglists.append(
               (target_list, target_dicts, data, params, config_name))
         pool.map(CallGenerateOutputForConfig, arglists)
       except KeyboardInterrupt, e:
         pool.terminate()
         raise e
     else:
       for config_name in config_names:
         GenerateOutputForConfig(target_list, target_dicts, data, params,
                                 config_name)