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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 
      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       '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 
     64 def 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