1# Copyright (c) 2012 The Chromium Authors. All rights reserved.
2# Use of this source code is governed by a BSD-style license that can be
3# found in the LICENSE file.
4
5# This file helps gyp_chromium and landmines correctly set up the gyp
6# environment from chromium.gyp_env on disk
7
8import os
9
10SCRIPT_DIR = os.path.dirname(os.path.realpath(__file__))
11CHROME_SRC = os.path.dirname(SCRIPT_DIR)
12
13
14def apply_gyp_environment_from_file(file_path):
15  """Reads in a *.gyp_env file and applies the valid keys to os.environ."""
16  if not os.path.exists(file_path):
17    return
18  with open(file_path, 'rU') as f:
19    file_contents = f.read()
20  try:
21    file_data = eval(file_contents, {'__builtins__': None}, None)
22  except SyntaxError, e:
23    e.filename = os.path.abspath(file_path)
24    raise
25  supported_vars = (
26      'CC',
27      'CC_wrapper',
28      'CC.host_wrapper',
29      'CHROMIUM_GYP_FILE',
30      'CHROMIUM_GYP_SYNTAX_CHECK',
31      'CXX',
32      'CXX_wrapper',
33      'CXX.host_wrapper',
34      'GYP_DEFINES',
35      'GYP_GENERATOR_FLAGS',
36      'GYP_CROSSCOMPILE',
37      'GYP_GENERATOR_OUTPUT',
38      'GYP_GENERATORS',
39      'GYP_INCLUDE_FIRST',
40      'GYP_INCLUDE_LAST',
41      'GYP_MSVS_VERSION',
42  )
43  for var in supported_vars:
44    file_val = file_data.get(var)
45    if file_val:
46      if var in os.environ:
47        behavior = 'replaces'
48        if var == 'GYP_DEFINES':
49          result = file_val + ' ' + os.environ[var]
50          behavior = 'merges with, and individual components override,'
51        else:
52          result = os.environ[var]
53        print 'INFO: Environment value for "%s" %s value in %s' % (
54            var, behavior, os.path.abspath(file_path)
55        )
56        string_padding = max(len(var), len(file_path), len('result'))
57        print '      %s: %s' % (var.rjust(string_padding), os.environ[var])
58        print '      %s: %s' % (file_path.rjust(string_padding), file_val)
59        os.environ[var] = result
60      else:
61        os.environ[var] = file_val
62
63
64def apply_chromium_gyp_env():
65  if 'SKIP_CHROMIUM_GYP_ENV' not in os.environ:
66    # Update the environment based on chromium.gyp_env
67    path = os.path.join(os.path.dirname(CHROME_SRC), 'chromium.gyp_env')
68    apply_gyp_environment_from_file(path)
69