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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      'CHROMIUM_GYP_FILE',
29      'CHROMIUM_GYP_SYNTAX_CHECK',
30      'CXX',
31      'CXX_wrapper',
32      'GYP_DEFINES',
33      'GYP_GENERATOR_FLAGS',
34      'GYP_CROSSCOMPILE',
35      'GYP_GENERATOR_OUTPUT',
36      'GYP_GENERATORS',
37  )
38  for var in supported_vars:
39    file_val = file_data.get(var)
40    if file_val:
41      if var in os.environ:
42        print 'INFO: Environment value for "%s" overrides value in %s.' % (
43            var, os.path.abspath(file_path)
44        )
45      else:
46        os.environ[var] = file_val
47
48
49def apply_chromium_gyp_env():
50  if 'SKIP_CHROMIUM_GYP_ENV' not in os.environ:
51    # Update the environment based on chromium.gyp_env
52    path = os.path.join(os.path.dirname(CHROME_SRC), 'chromium.gyp_env')
53    apply_gyp_environment_from_file(path)
54