gyp_chromium integration for automatic toolchain

build/gyp_chromium

 #!/usr/bin/env python
 
 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # This script is wrapper for Chromium that adds some support for how GYP
 # is invoked by Chromium beyond what can be done in the gclient hooks.
 
 import glob
 import gyp_helper
 import os
+import pipes
 import shlex
 import subprocess
 import sys
 
 script_dir = os.path.dirname(os.path.realpath(__file__))
 chrome_src = os.path.abspath(os.path.join(script_dir, os.pardir))
 
 sys.path.insert(0, os.path.join(chrome_src, 'tools', 'gyp', 'pylib'))
 import gyp
 
@@ skipping 121 matching lines @@
   # Also default to ninja on mac, but only when not building chrome/ios.
   # . -f / --format has precedence over the env var, no need to check for it
   # . set the env var only if it hasn't been set yet
   # . chromium.gyp_env has been applied to os.environ at this point already
   if sys.platform.startswith('linux') and not os.environ.get('GYP_GENERATORS'):
     os.environ['GYP_GENERATORS'] = 'ninja'
   elif sys.platform == 'darwin' and not os.environ.get('GYP_GENERATORS') and \
       not 'OS=ios' in os.environ.get('GYP_DEFINES', []):
     os.environ['GYP_GENERATORS'] = 'ninja'
 
+  # If using ninja on windows, and not opting out of the the automatic
+  # toolchain, then set up variables for the automatic toolchain. Opt-out is
+  # on by default, for now.
+  if (sys.platform in ('win32', 'cygwin') and
+      os.environ.get('GYP_GENERATORS') == 'ninja' and
+      os.environ.get('GYP_MSVS_USE_SYSTEM_TOOLCHAIN', '1') != '1'):
+    # For now, call the acquisition script here so that there's only one
+    # opt-in step required. This will be moved to a separate DEPS step once
+    # it's on by default.
+    subprocess.check_call([
+        sys.executable,
+        os.path.normpath(os.path.join(script_dir, '..', 'tools', 'win',
+                                      'toolchain',
+                                      'get_toolchain_if_necessary.py'))])
+    toolchain = os.path.normpath(os.path.join(
+        script_dir, '..', 'third_party', 'win_toolchain', 'files'))
+    os.environ['GYP_MSVS_OVERRIDE_PATH'] = toolchain
+    os.environ['GYP_MSVS_VERSION'] = '2013'
+    # We need to make sure windows_sdk_path is set to the automated toolchain
+    # values in GYP_DEFINES, but don't want to override any other values there.
+    gyp_defines_dict = gyp.NameValueListToDict(gyp.ShlexEnv('GYP_DEFINES'))
+    win8sdk = os.path.join(toolchain, 'win8sdk')
+    gyp_defines_dict['windows_sdk_path'] = win8sdk
+    os.environ['WINDOWSSDKDIR'] = win8sdk
+    os.environ['GYP_DEFINES'] = ' '.join('%s=%s' % (k, pipes.quote(str(v)))
+        for k, v in gyp_defines_dict.iteritems())
+    print('Using automatic toolchain in %s.' % toolchain)
+
   # If CHROMIUM_GYP_SYNTAX_CHECK is set to 1, it will invoke gyp with --check
   # to enfore syntax checking.
   syntax_check = os.environ.get('CHROMIUM_GYP_SYNTAX_CHECK')
   if syntax_check and int(syntax_check):
     args.append('--check')
 
   print 'Updating projects from gyp files...'
   sys.stdout.flush()
 
   # Off we go...
   sys.exit(gyp.main(args))