1# Copyright 2014 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"""
6Sets up various automatic gyp environment variables. These are used by
7gyp_chromium and landmines.py which run at different stages of runhooks. To
8make sure settings are consistent between them, all setup should happen here.
9"""
10
11import gyp_helper
12import os
13import sys
14import vs_toolchain
15
16def SetEnvironment():
17  """Sets defaults for GYP_* variables."""
18  gyp_helper.apply_chromium_gyp_env()
19
20  # Default to ninja on linux and windows, but only if no generator has
21  # explicitly been set.
22  # Also default to ninja on mac, but only when not building chrome/ios.
23  # . -f / --format has precedence over the env var, no need to check for it
24  # . set the env var only if it hasn't been set yet
25  # . chromium.gyp_env has been applied to os.environ at this point already
26  if sys.platform.startswith(('linux', 'win', 'freebsd')) and \
27      not os.environ.get('GYP_GENERATORS'):
28    os.environ['GYP_GENERATORS'] = 'ninja'
29  elif sys.platform == 'darwin' and not os.environ.get('GYP_GENERATORS') and \
30      not 'OS=ios' in os.environ.get('GYP_DEFINES', []):
31    os.environ['GYP_GENERATORS'] = 'ninja'
32
33  vs_toolchain.SetEnvironmentAndGetRuntimeDllDirs()
34