build/gyp_helper.py

   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
   8 import os
   9
  10 SCRIPT_DIR = os.path.dirname(os.path.realpath(__file__))
  11 CHROME_SRC = os.path.dirname(SCRIPT_DIR)
  12
  13
  14 def 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       'GYP_INCLUDE_FIRST',
  38       'GYP_INCLUDE_LAST',
  39       'GYP_MSVS_VERSION',
  40   )
  41   for var in supported_vars:
  42     file_val = file_data.get(var)
  43     if file_val:
  44       if var in os.environ:
  45         behavior = 'replaces'
  46         if var == 'GYP_DEFINES':
  47           result = file_val + ' ' + os.environ[var]
  48           behavior = 'merges with, and individual components override,'
  49         else:
  50           result = os.environ[var]
  51         print 'INFO: Environment value for "%s" %s value in %s' % (
  52             var, behavior, os.path.abspath(file_path)
  53         )
  54         string_padding = max(len(var), len(file_path), len('result'))
  55         print '      %s: %s' % (var.rjust(string_padding), os.environ[var])
  56         print '      %s: %s' % (file_path.rjust(string_padding), file_val)
  57         os.environ[var] = result
  58       else:
  59         os.environ[var] = file_val
  60
  61
  62 def apply_chromium_gyp_env():
  63   if 'SKIP_CHROMIUM_GYP_ENV' not in os.environ:
  64     # Update the environment based on chromium.gyp_env
  65     path = os.path.join(os.path.dirname(CHROME_SRC), 'chromium.gyp_env')
  66     apply_gyp_environment_from_file(path)