42 def FindGn(options):  argument
43   if options.host_os == "linux":
45   elif options.host_os == "mac":
47   elif options.host_os == "win":
51   return os.path.join(options.v8_path, "buildtools", os_path, "gn")
53 def GenerateBuildFiles(options):  argument
54   gn = FindGn(options)
56   target_os = FindTargetOs(options.flag)
60   for flag in options.flag:
65   if options.mode == "Debug":
71   if options.extra_gn_args:
72     flattened_args += ' ' + options.extra_gn_args
74   args = [gn, "gen", options.build_path, "-q", "--args=" + flattened_args]
77 def Build(options):  argument
78   depot_tools = node_common.EnsureDepotTools(options.v8_path, False)
83   args = [ninja, "-C", options.build_path, BUILD_TARGET]
84   if options.max_load:
85     args += ["-l" + options.max_load]
86   if options.max_jobs:
87     args += ["-j" + options.max_jobs]
89     with open(os.path.join(options.build_path, "args.gn")) as f:
114   options = parser.parse_args(args)
116   options.build_path = os.path.abspath(options.build_path)
118   if not options.build:
119     assert options.host_os
120     assert options.mode == "Debug" or options.mode == "Release"
122     options.v8_path = os.path.abspath(options.v8_path)
123     assert os.path.isdir(options.v8_path)
125   return options
129   options = ParseOptions(sys.argv[1:])  variable
132   if options.bundled_win_toolchain:
133     os.environ['DEPOT_TOOLS_WIN_TOOLCHAIN'] = options.bundled_win_toolchain
134   if options.bundled_win_toolchain_root:
136         options.bundled_win_toolchain_root)
137   if options.depot_tools:
139         options.depot_tools + os.path.pathsep + os.environ['PATH'])
140   if not options.build:
141     GenerateBuildFiles(options)
143     Build(options)