X-Git-Url: https://gerrit.simantics.org/r/gitweb?a=blobdiff_plain;ds=sidebyside;f=org.simantics.maps.server%2Fnode%2Fnode-v4.8.0-win-x64%2Fnode_modules%2Fnpm%2Fnode_modules%2Fnode-gyp%2Fgyp%2Fpylib%2Fgyp%2Fmsvs_emulation.py;fp=org.simantics.maps.server%2Fnode%2Fnode-v4.8.0-win-x64%2Fnode_modules%2Fnpm%2Fnode_modules%2Fnode-gyp%2Fgyp%2Fpylib%2Fgyp%2Fmsvs_emulation.py;h=ca67b122f0b9b1d0544eebce9a66a678c9dd6853;hb=2529be6d456deeb07c128603ce4971f1dc29b695;hp=0000000000000000000000000000000000000000;hpb=2636fc31c16c23711cf2b06a4ae8537bba9c1d35;p=simantics%2Fdistrict.git

diff --git a/org.simantics.maps.server/node/node-v4.8.0-win-x64/node_modules/npm/node_modules/node-gyp/gyp/pylib/gyp/msvs_emulation.py b/org.simantics.maps.server/node/node-v4.8.0-win-x64/node_modules/npm/node_modules/node-gyp/gyp/pylib/gyp/msvs_emulation.py
new file mode 100644
index 00000000..ca67b122
--- /dev/null
+++ b/org.simantics.maps.server/node/node-v4.8.0-win-x64/node_modules/npm/node_modules/node-gyp/gyp/pylib/gyp/msvs_emulation.py
@@ -0,0 +1,1087 @@
+# Copyright (c) 2012 Google Inc. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""
+This module helps emulate Visual Studio 2008 behavior on top of other
+build systems, primarily ninja.
+"""
+
+import os
+import re
+import subprocess
+import sys
+
+from gyp.common import OrderedSet
+import gyp.MSVSUtil
+import gyp.MSVSVersion
+
+
+windows_quoter_regex = re.compile(r'(\\*)"')
+
+
+def QuoteForRspFile(arg):
+  """Quote a command line argument so that it appears as one argument when
+  processed via cmd.exe and parsed by CommandLineToArgvW (as is typical for
+  Windows programs)."""
+  # See http://goo.gl/cuFbX and http://goo.gl/dhPnp including the comment
+  # threads. This is actually the quoting rules for CommandLineToArgvW, not
+  # for the shell, because the shell doesn't do anything in Windows. This
+  # works more or less because most programs (including the compiler, etc.)
+  # use that function to handle command line arguments.
+
+  # For a literal quote, CommandLineToArgvW requires 2n+1 backslashes
+  # preceding it, and results in n backslashes + the quote. So we substitute
+  # in 2* what we match, +1 more, plus the quote.
+  arg = windows_quoter_regex.sub(lambda mo: 2 * mo.group(1) + '\\"', arg)
+
+  # %'s also need to be doubled otherwise they're interpreted as batch
+  # positional arguments. Also make sure to escape the % so that they're
+  # passed literally through escaping so they can be singled to just the
+  # original %. Otherwise, trying to pass the literal representation that
+  # looks like an environment variable to the shell (e.g. %PATH%) would fail.
+  arg = arg.replace('%', '%%')
+
+  # These commands are used in rsp files, so no escaping for the shell (via ^)
+  # is necessary.
+
+  # Finally, wrap the whole thing in quotes so that the above quote rule
+  # applies and whitespace isn't a word break.
+  return '"' + arg + '"'
+
+
+def EncodeRspFileList(args):
+  """Process a list of arguments using QuoteCmdExeArgument."""
+  # Note that the first argument is assumed to be the command. Don't add
+  # quotes around it because then built-ins like 'echo', etc. won't work.
+  # Take care to normpath only the path in the case of 'call ../x.bat' because
+  # otherwise the whole thing is incorrectly interpreted as a path and not
+  # normalized correctly.
+  if not args: return ''
+  if args[0].startswith('call '):
+    call, program = args[0].split(' ', 1)
+    program = call + ' ' + os.path.normpath(program)
+  else:
+    program = os.path.normpath(args[0])
+  return program + ' ' + ' '.join(QuoteForRspFile(arg) for arg in args[1:])
+
+
+def _GenericRetrieve(root, default, path):
+  """Given a list of dictionary keys |path| and a tree of dicts |root|, find
+  value at path, or return |default| if any of the path doesn't exist."""
+  if not root:
+    return default
+  if not path:
+    return root
+  return _GenericRetrieve(root.get(path[0]), default, path[1:])
+
+
+def _AddPrefix(element, prefix):
+  """Add |prefix| to |element| or each subelement if element is iterable."""
+  if element is None:
+    return element
+  # Note, not Iterable because we don't want to handle strings like that.
+  if isinstance(element, list) or isinstance(element, tuple):
+    return [prefix + e for e in element]
+  else:
+    return prefix + element
+
+
+def _DoRemapping(element, map):
+  """If |element| then remap it through |map|. If |element| is iterable then
+  each item will be remapped. Any elements not found will be removed."""
+  if map is not None and element is not None:
+    if not callable(map):
+      map = map.get # Assume it's a dict, otherwise a callable to do the remap.
+    if isinstance(element, list) or isinstance(element, tuple):
+      element = filter(None, [map(elem) for elem in element])
+    else:
+      element = map(element)
+  return element
+
+
+def _AppendOrReturn(append, element):
+  """If |append| is None, simply return |element|. If |append| is not None,
+  then add |element| to it, adding each item in |element| if it's a list or
+  tuple."""
+  if append is not None and element is not None:
+    if isinstance(element, list) or isinstance(element, tuple):
+      append.extend(element)
+    else:
+      append.append(element)
+  else:
+    return element
+
+
+def _FindDirectXInstallation():
+  """Try to find an installation location for the DirectX SDK. Check for the
+  standard environment variable, and if that doesn't exist, try to find
+  via the registry. May return None if not found in either location."""
+  # Return previously calculated value, if there is one
+  if hasattr(_FindDirectXInstallation, 'dxsdk_dir'):
+    return _FindDirectXInstallation.dxsdk_dir
+
+  dxsdk_dir = os.environ.get('DXSDK_DIR')
+  if not dxsdk_dir:
+    # Setup params to pass to and attempt to launch reg.exe.
+    cmd = ['reg.exe', 'query', r'HKLM\Software\Microsoft\DirectX', '/s']
+    p = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+    for line in p.communicate()[0].splitlines():
+      if 'InstallPath' in line:
+        dxsdk_dir = line.split('    ')[3] + "\\"
+
+  # Cache return value
+  _FindDirectXInstallation.dxsdk_dir = dxsdk_dir
+  return dxsdk_dir
+
+
+def GetGlobalVSMacroEnv(vs_version):
+  """Get a dict of variables mapping internal VS macro names to their gyp
+  equivalents. Returns all variables that are independent of the target."""
+  env = {}
+  # '$(VSInstallDir)' and '$(VCInstallDir)' are available when and only when
+  # Visual Studio is actually installed.
+  if vs_version.Path():
+    env['$(VSInstallDir)'] = vs_version.Path()
+    env['$(VCInstallDir)'] = os.path.join(vs_version.Path(), 'VC') + '\\'
+  # Chromium uses DXSDK_DIR in include/lib paths, but it may or may not be
+  # set. This happens when the SDK is sync'd via src-internal, rather than
+  # by typical end-user installation of the SDK. If it's not set, we don't
+  # want to leave the unexpanded variable in the path, so simply strip it.
+  dxsdk_dir = _FindDirectXInstallation()
+  env['$(DXSDK_DIR)'] = dxsdk_dir if dxsdk_dir else ''
+  # Try to find an installation location for the Windows DDK by checking
+  # the WDK_DIR environment variable, may be None.
+  env['$(WDK_DIR)'] = os.environ.get('WDK_DIR', '')
+  return env
+
+def ExtractSharedMSVSSystemIncludes(configs, generator_flags):
+  """Finds msvs_system_include_dirs that are common to all targets, removes
+  them from all targets, and returns an OrderedSet containing them."""
+  all_system_includes = OrderedSet(
+      configs[0].get('msvs_system_include_dirs', []))
+  for config in configs[1:]:
+    system_includes = config.get('msvs_system_include_dirs', [])
+    all_system_includes = all_system_includes & OrderedSet(system_includes)
+  if not all_system_includes:
+    return None
+  # Expand macros in all_system_includes.
+  env = GetGlobalVSMacroEnv(GetVSVersion(generator_flags))
+  expanded_system_includes = OrderedSet([ExpandMacros(include, env)
+                                         for include in all_system_includes])
+  if any(['$' in include for include in expanded_system_includes]):
+    # Some path relies on target-specific variables, bail.
+    return None
+
+  # Remove system includes shared by all targets from the targets.
+  for config in configs:
+    includes = config.get('msvs_system_include_dirs', [])
+    if includes:  # Don't insert a msvs_system_include_dirs key if not needed.
+      # This must check the unexpanded includes list:
+      new_includes = [i for i in includes if i not in all_system_includes]
+      config['msvs_system_include_dirs'] = new_includes
+  return expanded_system_includes
+
+
+class MsvsSettings(object):
+  """A class that understands the gyp 'msvs_...' values (especially the
+  msvs_settings field). They largely correpond to the VS2008 IDE DOM. This
+  class helps map those settings to command line options."""
+
+  def __init__(self, spec, generator_flags):
+    self.spec = spec
+    self.vs_version = GetVSVersion(generator_flags)
+
+    supported_fields = [
+        ('msvs_configuration_attributes', dict),
+        ('msvs_settings', dict),
+        ('msvs_system_include_dirs', list),
+        ('msvs_disabled_warnings', list),
+        ('msvs_precompiled_header', str),
+        ('msvs_precompiled_source', str),
+        ('msvs_configuration_platform', str),
+        ('msvs_target_platform', str),
+        ]
+    configs = spec['configurations']
+    for field, default in supported_fields:
+      setattr(self, field, {})
+      for configname, config in configs.iteritems():
+        getattr(self, field)[configname] = config.get(field, default())
+
+    self.msvs_cygwin_dirs = spec.get('msvs_cygwin_dirs', ['.'])
+
+    unsupported_fields = [
+        'msvs_prebuild',
+        'msvs_postbuild',
+    ]
+    unsupported = []
+    for field in unsupported_fields:
+      for config in configs.values():
+        if field in config:
+          unsupported += ["%s not supported (target %s)." %
+                          (field, spec['target_name'])]
+    if unsupported:
+      raise Exception('\n'.join(unsupported))
+
+  def GetExtension(self):
+    """Returns the extension for the target, with no leading dot.
+
+    Uses 'product_extension' if specified, otherwise uses MSVS defaults based on
+    the target type.
+    """
+    ext = self.spec.get('product_extension', None)
+    if ext:
+      return ext
+    return gyp.MSVSUtil.TARGET_TYPE_EXT.get(self.spec['type'], '')
+
+  def GetVSMacroEnv(self, base_to_build=None, config=None):
+    """Get a dict of variables mapping internal VS macro names to their gyp
+    equivalents."""
+    target_platform = 'Win32' if self.GetArch(config) == 'x86' else 'x64'
+    target_name = self.spec.get('product_prefix', '') + \
+        self.spec.get('product_name', self.spec['target_name'])
+    target_dir = base_to_build + '\\' if base_to_build else ''
+    target_ext = '.' + self.GetExtension()
+    target_file_name = target_name + target_ext
+
+    replacements = {
+        '$(InputName)': '${root}',
+        '$(InputPath)': '${source}',
+        '$(IntDir)': '$!INTERMEDIATE_DIR',
+        '$(OutDir)\\': target_dir,
+        '$(PlatformName)': target_platform,
+        '$(ProjectDir)\\': '',
+        '$(ProjectName)': self.spec['target_name'],
+        '$(TargetDir)\\': target_dir,
+        '$(TargetExt)': target_ext,
+        '$(TargetFileName)': target_file_name,
+        '$(TargetName)': target_name,
+        '$(TargetPath)': os.path.join(target_dir, target_file_name),
+    }
+    replacements.update(GetGlobalVSMacroEnv(self.vs_version))
+    return replacements
+
+  def ConvertVSMacros(self, s, base_to_build=None, config=None):
+    """Convert from VS macro names to something equivalent."""
+    env = self.GetVSMacroEnv(base_to_build, config=config)
+    return ExpandMacros(s, env)
+
+  def AdjustLibraries(self, libraries):
+    """Strip -l from library if it's specified with that."""
+    libs = [lib[2:] if lib.startswith('-l') else lib for lib in libraries]
+    return [lib + '.lib' if not lib.endswith('.lib') else lib for lib in libs]
+
+  def _GetAndMunge(self, field, path, default, prefix, append, map):
+    """Retrieve a value from |field| at |path| or return |default|. If
+    |append| is specified, and the item is found, it will be appended to that
+    object instead of returned. If |map| is specified, results will be
+    remapped through |map| before being returned or appended."""
+    result = _GenericRetrieve(field, default, path)
+    result = _DoRemapping(result, map)
+    result = _AddPrefix(result, prefix)
+    return _AppendOrReturn(append, result)
+
+  class _GetWrapper(object):
+    def __init__(self, parent, field, base_path, append=None):
+      self.parent = parent
+      self.field = field
+      self.base_path = [base_path]
+      self.append = append
+    def __call__(self, name, map=None, prefix='', default=None):
+      return self.parent._GetAndMunge(self.field, self.base_path + [name],
+          default=default, prefix=prefix, append=self.append, map=map)
+
+  def GetArch(self, config):
+    """Get architecture based on msvs_configuration_platform and
+    msvs_target_platform. Returns either 'x86' or 'x64'."""
+    configuration_platform = self.msvs_configuration_platform.get(config, '')
+    platform = self.msvs_target_platform.get(config, '')
+    if not platform: # If no specific override, use the configuration's.
+      platform = configuration_platform
+    # Map from platform to architecture.
+    return {'Win32': 'x86', 'x64': 'x64'}.get(platform, 'x86')
+
+  def _TargetConfig(self, config):
+    """Returns the target-specific configuration."""
+    # There's two levels of architecture/platform specification in VS. The
+    # first level is globally for the configuration (this is what we consider
+    # "the" config at the gyp level, which will be something like 'Debug' or
+    # 'Release_x64'), and a second target-specific configuration, which is an
+    # override for the global one. |config| is remapped here to take into
+    # account the local target-specific overrides to the global configuration.
+    arch = self.GetArch(config)
+    if arch == 'x64' and not config.endswith('_x64'):
+      config += '_x64'
+    if arch == 'x86' and config.endswith('_x64'):
+      config = config.rsplit('_', 1)[0]
+    return config
+
+  def _Setting(self, path, config,
+              default=None, prefix='', append=None, map=None):
+    """_GetAndMunge for msvs_settings."""
+    return self._GetAndMunge(
+        self.msvs_settings[config], path, default, prefix, append, map)
+
+  def _ConfigAttrib(self, path, config,
+                   default=None, prefix='', append=None, map=None):
+    """_GetAndMunge for msvs_configuration_attributes."""
+    return self._GetAndMunge(
+        self.msvs_configuration_attributes[config],
+        path, default, prefix, append, map)
+
+  def AdjustIncludeDirs(self, include_dirs, config):
+    """Updates include_dirs to expand VS specific paths, and adds the system
+    include dirs used for platform SDK and similar."""
+    config = self._TargetConfig(config)
+    includes = include_dirs + self.msvs_system_include_dirs[config]
+    includes.extend(self._Setting(
+      ('VCCLCompilerTool', 'AdditionalIncludeDirectories'), config, default=[]))
+    return [self.ConvertVSMacros(p, config=config) for p in includes]
+
+  def AdjustMidlIncludeDirs(self, midl_include_dirs, config):
+    """Updates midl_include_dirs to expand VS specific paths, and adds the
+    system include dirs used for platform SDK and similar."""
+    config = self._TargetConfig(config)
+    includes = midl_include_dirs + self.msvs_system_include_dirs[config]
+    includes.extend(self._Setting(
+      ('VCMIDLTool', 'AdditionalIncludeDirectories'), config, default=[]))
+    return [self.ConvertVSMacros(p, config=config) for p in includes]
+
+  def GetComputedDefines(self, config):
+    """Returns the set of defines that are injected to the defines list based
+    on other VS settings."""
+    config = self._TargetConfig(config)
+    defines = []
+    if self._ConfigAttrib(['CharacterSet'], config) == '1':
+      defines.extend(('_UNICODE', 'UNICODE'))
+    if self._ConfigAttrib(['CharacterSet'], config) == '2':
+      defines.append('_MBCS')
+    defines.extend(self._Setting(
+        ('VCCLCompilerTool', 'PreprocessorDefinitions'), config, default=[]))
+    return defines
+
+  def GetCompilerPdbName(self, config, expand_special):
+    """Get the pdb file name that should be used for compiler invocations, or
+    None if there's no explicit name specified."""
+    config = self._TargetConfig(config)
+    pdbname = self._Setting(
+        ('VCCLCompilerTool', 'ProgramDataBaseFileName'), config)
+    if pdbname:
+      pdbname = expand_special(self.ConvertVSMacros(pdbname))
+    return pdbname
+
+  def GetMapFileName(self, config, expand_special):
+    """Gets the explicitly overriden map file name for a target or returns None
+    if it's not set."""
+    config = self._TargetConfig(config)
+    map_file = self._Setting(('VCLinkerTool', 'MapFileName'), config)
+    if map_file:
+      map_file = expand_special(self.ConvertVSMacros(map_file, config=config))
+    return map_file
+
+  def GetOutputName(self, config, expand_special):
+    """Gets the explicitly overridden output name for a target or returns None
+    if it's not overridden."""
+    config = self._TargetConfig(config)
+    type = self.spec['type']
+    root = 'VCLibrarianTool' if type == 'static_library' else 'VCLinkerTool'
+    # TODO(scottmg): Handle OutputDirectory without OutputFile.
+    output_file = self._Setting((root, 'OutputFile'), config)
+    if output_file:
+      output_file = expand_special(self.ConvertVSMacros(
+          output_file, config=config))
+    return output_file
+
+  def GetPDBName(self, config, expand_special, default):
+    """Gets the explicitly overridden pdb name for a target or returns
+    default if it's not overridden, or if no pdb will be generated."""
+    config = self._TargetConfig(config)
+    output_file = self._Setting(('VCLinkerTool', 'ProgramDatabaseFile'), config)
+    generate_debug_info = self._Setting(
+        ('VCLinkerTool', 'GenerateDebugInformation'), config)
+    if generate_debug_info == 'true':
+      if output_file:
+        return expand_special(self.ConvertVSMacros(output_file, config=config))
+      else:
+        return default
+    else:
+      return None
+
+  def GetNoImportLibrary(self, config):
+    """If NoImportLibrary: true, ninja will not expect the output to include
+    an import library."""
+    config = self._TargetConfig(config)
+    noimplib = self._Setting(('NoImportLibrary',), config)
+    return noimplib == 'true'
+
+  def GetAsmflags(self, config):
+    """Returns the flags that need to be added to ml invocations."""
+    config = self._TargetConfig(config)
+    asmflags = []
+    safeseh = self._Setting(('MASM', 'UseSafeExceptionHandlers'), config)
+    if safeseh == 'true':
+      asmflags.append('/safeseh')
+    return asmflags
+
+  def GetCflags(self, config):
+    """Returns the flags that need to be added to .c and .cc compilations."""
+    config = self._TargetConfig(config)
+    cflags = []
+    cflags.extend(['/wd' + w for w in self.msvs_disabled_warnings[config]])
+    cl = self._GetWrapper(self, self.msvs_settings[config],
+                          'VCCLCompilerTool', append=cflags)
+    cl('Optimization',
+       map={'0': 'd', '1': '1', '2': '2', '3': 'x'}, prefix='/O', default='2')
+    cl('InlineFunctionExpansion', prefix='/Ob')
+    cl('DisableSpecificWarnings', prefix='/wd')
+    cl('StringPooling', map={'true': '/GF'})
+    cl('EnableFiberSafeOptimizations', map={'true': '/GT'})
+    cl('OmitFramePointers', map={'false': '-', 'true': ''}, prefix='/Oy')
+    cl('EnableIntrinsicFunctions', map={'false': '-', 'true': ''}, prefix='/Oi')
+    cl('FavorSizeOrSpeed', map={'1': 't', '2': 's'}, prefix='/O')
+    cl('FloatingPointModel',
+        map={'0': 'precise', '1': 'strict', '2': 'fast'}, prefix='/fp:',
+        default='0')
+    cl('CompileAsManaged', map={'false': '', 'true': '/clr'})
+    cl('WholeProgramOptimization', map={'true': '/GL'})
+    cl('WarningLevel', prefix='/W')
+    cl('WarnAsError', map={'true': '/WX'})
+    cl('CallingConvention',
+        map={'0': 'd', '1': 'r', '2': 'z', '3': 'v'}, prefix='/G')
+    cl('DebugInformationFormat',
+        map={'1': '7', '3': 'i', '4': 'I'}, prefix='/Z')
+    cl('RuntimeTypeInfo', map={'true': '/GR', 'false': '/GR-'})
+    cl('EnableFunctionLevelLinking', map={'true': '/Gy', 'false': '/Gy-'})
+    cl('MinimalRebuild', map={'true': '/Gm'})
+    cl('BufferSecurityCheck', map={'true': '/GS', 'false': '/GS-'})
+    cl('BasicRuntimeChecks', map={'1': 's', '2': 'u', '3': '1'}, prefix='/RTC')
+    cl('RuntimeLibrary',
+        map={'0': 'T', '1': 'Td', '2': 'D', '3': 'Dd'}, prefix='/M')
+    cl('ExceptionHandling', map={'1': 'sc','2': 'a'}, prefix='/EH')
+    cl('DefaultCharIsUnsigned', map={'true': '/J'})
+    cl('TreatWChar_tAsBuiltInType',
+        map={'false': '-', 'true': ''}, prefix='/Zc:wchar_t')
+    cl('EnablePREfast', map={'true': '/analyze'})
+    cl('AdditionalOptions', prefix='')
+    cl('EnableEnhancedInstructionSet',
+        map={'1': 'SSE', '2': 'SSE2', '3': 'AVX', '4': 'IA32', '5': 'AVX2'},
+        prefix='/arch:')
+    cflags.extend(['/FI' + f for f in self._Setting(
+        ('VCCLCompilerTool', 'ForcedIncludeFiles'), config, default=[])])
+    if self.vs_version.short_name in ('2013', '2013e', '2015'):
+      # New flag required in 2013 to maintain previous PDB behavior.
+      cflags.append('/FS')
+    # ninja handles parallelism by itself, don't have the compiler do it too.
+    cflags = filter(lambda x: not x.startswith('/MP'), cflags)
+    return cflags
+
+  def _GetPchFlags(self, config, extension):
+    """Get the flags to be added to the cflags for precompiled header support.
+    """
+    config = self._TargetConfig(config)
+    # The PCH is only built once by a particular source file. Usage of PCH must
+    # only be for the same language (i.e. C vs. C++), so only include the pch
+    # flags when the language matches.
+    if self.msvs_precompiled_header[config]:
+      source_ext = os.path.splitext(self.msvs_precompiled_source[config])[1]
+      if _LanguageMatchesForPch(source_ext, extension):
+        pch = os.path.split(self.msvs_precompiled_header[config])[1]
+        return ['/Yu' + pch, '/FI' + pch, '/Fp${pchprefix}.' + pch + '.pch']
+    return  []
+
+  def GetCflagsC(self, config):
+    """Returns the flags that need to be added to .c compilations."""
+    config = self._TargetConfig(config)
+    return self._GetPchFlags(config, '.c')
+
+  def GetCflagsCC(self, config):
+    """Returns the flags that need to be added to .cc compilations."""
+    config = self._TargetConfig(config)
+    return ['/TP'] + self._GetPchFlags(config, '.cc')
+
+  def _GetAdditionalLibraryDirectories(self, root, config, gyp_to_build_path):
+    """Get and normalize the list of paths in AdditionalLibraryDirectories
+    setting."""
+    config = self._TargetConfig(config)
+    libpaths = self._Setting((root, 'AdditionalLibraryDirectories'),
+                             config, default=[])
+    libpaths = [os.path.normpath(
+                    gyp_to_build_path(self.ConvertVSMacros(p, config=config)))
+                for p in libpaths]
+    return ['/LIBPATH:"' + p + '"' for p in libpaths]
+
+  def GetLibFlags(self, config, gyp_to_build_path):
+    """Returns the flags that need to be added to lib commands."""
+    config = self._TargetConfig(config)
+    libflags = []
+    lib = self._GetWrapper(self, self.msvs_settings[config],
+                          'VCLibrarianTool', append=libflags)
+    libflags.extend(self._GetAdditionalLibraryDirectories(
+        'VCLibrarianTool', config, gyp_to_build_path))
+    lib('LinkTimeCodeGeneration', map={'true': '/LTCG'})
+    lib('TargetMachine', map={'1': 'X86', '17': 'X64', '3': 'ARM'},
+        prefix='/MACHINE:')
+    lib('AdditionalOptions')
+    return libflags
+
+  def GetDefFile(self, gyp_to_build_path):
+    """Returns the .def file from sources, if any.  Otherwise returns None."""
+    spec = self.spec
+    if spec['type'] in ('shared_library', 'loadable_module', 'executable'):
+      def_files = [s for s in spec.get('sources', []) if s.endswith('.def')]
+      if len(def_files) == 1:
+        return gyp_to_build_path(def_files[0])
+      elif len(def_files) > 1:
+        raise Exception("Multiple .def files")
+    return None
+
+  def _GetDefFileAsLdflags(self, ldflags, gyp_to_build_path):
+    """.def files get implicitly converted to a ModuleDefinitionFile for the
+    linker in the VS generator. Emulate that behaviour here."""
+    def_file = self.GetDefFile(gyp_to_build_path)
+    if def_file:
+      ldflags.append('/DEF:"%s"' % def_file)
+
+  def GetPGDName(self, config, expand_special):
+    """Gets the explicitly overridden pgd name for a target or returns None
+    if it's not overridden."""
+    config = self._TargetConfig(config)
+    output_file = self._Setting(
+        ('VCLinkerTool', 'ProfileGuidedDatabase'), config)
+    if output_file:
+      output_file = expand_special(self.ConvertVSMacros(
+          output_file, config=config))
+    return output_file
+
+  def GetLdflags(self, config, gyp_to_build_path, expand_special,
+                 manifest_base_name, output_name, is_executable, build_dir):
+    """Returns the flags that need to be added to link commands, and the
+    manifest files."""
+    config = self._TargetConfig(config)
+    ldflags = []
+    ld = self._GetWrapper(self, self.msvs_settings[config],
+                          'VCLinkerTool', append=ldflags)
+    self._GetDefFileAsLdflags(ldflags, gyp_to_build_path)
+    ld('GenerateDebugInformation', map={'true': '/DEBUG'})
+    ld('TargetMachine', map={'1': 'X86', '17': 'X64', '3': 'ARM'},
+       prefix='/MACHINE:')
+    ldflags.extend(self._GetAdditionalLibraryDirectories(
+        'VCLinkerTool', config, gyp_to_build_path))
+    ld('DelayLoadDLLs', prefix='/DELAYLOAD:')
+    ld('TreatLinkerWarningAsErrors', prefix='/WX',
+       map={'true': '', 'false': ':NO'})
+    out = self.GetOutputName(config, expand_special)
+    if out:
+      ldflags.append('/OUT:' + out)
+    pdb = self.GetPDBName(config, expand_special, output_name + '.pdb')
+    if pdb:
+      ldflags.append('/PDB:' + pdb)
+    pgd = self.GetPGDName(config, expand_special)
+    if pgd:
+      ldflags.append('/PGD:' + pgd)
+    map_file = self.GetMapFileName(config, expand_special)
+    ld('GenerateMapFile', map={'true': '/MAP:' + map_file if map_file
+        else '/MAP'})
+    ld('MapExports', map={'true': '/MAPINFO:EXPORTS'})
+    ld('AdditionalOptions', prefix='')
+
+    minimum_required_version = self._Setting(
+        ('VCLinkerTool', 'MinimumRequiredVersion'), config, default='')
+    if minimum_required_version:
+      minimum_required_version = ',' + minimum_required_version
+    ld('SubSystem',
+       map={'1': 'CONSOLE%s' % minimum_required_version,
+            '2': 'WINDOWS%s' % minimum_required_version},
+       prefix='/SUBSYSTEM:')
+
+    stack_reserve_size = self._Setting(
+        ('VCLinkerTool', 'StackReserveSize'), config, default='')
+    if stack_reserve_size:
+      stack_commit_size = self._Setting(
+          ('VCLinkerTool', 'StackCommitSize'), config, default='')
+      if stack_commit_size:
+        stack_commit_size = ',' + stack_commit_size
+      ldflags.append('/STACK:%s%s' % (stack_reserve_size, stack_commit_size))
+
+    ld('TerminalServerAware', map={'1': ':NO', '2': ''}, prefix='/TSAWARE')
+    ld('LinkIncremental', map={'1': ':NO', '2': ''}, prefix='/INCREMENTAL')
+    ld('BaseAddress', prefix='/BASE:')
+    ld('FixedBaseAddress', map={'1': ':NO', '2': ''}, prefix='/FIXED')
+    ld('RandomizedBaseAddress',
+        map={'1': ':NO', '2': ''}, prefix='/DYNAMICBASE')
+    ld('DataExecutionPrevention',
+        map={'1': ':NO', '2': ''}, prefix='/NXCOMPAT')
+    ld('OptimizeReferences', map={'1': 'NOREF', '2': 'REF'}, prefix='/OPT:')
+    ld('ForceSymbolReferences', prefix='/INCLUDE:')
+    ld('EnableCOMDATFolding', map={'1': 'NOICF', '2': 'ICF'}, prefix='/OPT:')
+    ld('LinkTimeCodeGeneration',
+        map={'1': '', '2': ':PGINSTRUMENT', '3': ':PGOPTIMIZE',
+             '4': ':PGUPDATE'},
+        prefix='/LTCG')
+    ld('IgnoreDefaultLibraryNames', prefix='/NODEFAULTLIB:')
+    ld('ResourceOnlyDLL', map={'true': '/NOENTRY'})
+    ld('EntryPointSymbol', prefix='/ENTRY:')
+    ld('Profile', map={'true': '/PROFILE'})
+    ld('LargeAddressAware',
+        map={'1': ':NO', '2': ''}, prefix='/LARGEADDRESSAWARE')
+    # TODO(scottmg): This should sort of be somewhere else (not really a flag).
+    ld('AdditionalDependencies', prefix='')
+
+    if self.GetArch(config) == 'x86':
+      safeseh_default = 'true'
+    else:
+      safeseh_default = None
+    ld('ImageHasSafeExceptionHandlers',
+        map={'false': ':NO', 'true': ''}, prefix='/SAFESEH',
+        default=safeseh_default)
+
+    # If the base address is not specifically controlled, DYNAMICBASE should
+    # be on by default.
+    base_flags = filter(lambda x: 'DYNAMICBASE' in x or x == '/FIXED',
+                        ldflags)
+    if not base_flags:
+      ldflags.append('/DYNAMICBASE')
+
+    # If the NXCOMPAT flag has not been specified, default to on. Despite the
+    # documentation that says this only defaults to on when the subsystem is
+    # Vista or greater (which applies to the linker), the IDE defaults it on
+    # unless it's explicitly off.
+    if not filter(lambda x: 'NXCOMPAT' in x, ldflags):
+      ldflags.append('/NXCOMPAT')
+
+    have_def_file = filter(lambda x: x.startswith('/DEF:'), ldflags)
+    manifest_flags, intermediate_manifest, manifest_files = \
+        self._GetLdManifestFlags(config, manifest_base_name, gyp_to_build_path,
+                                 is_executable and not have_def_file, build_dir)
+    ldflags.extend(manifest_flags)
+    return ldflags, intermediate_manifest, manifest_files
+
+  def _GetLdManifestFlags(self, config, name, gyp_to_build_path,
+                          allow_isolation, build_dir):
+    """Returns a 3-tuple:
+    - the set of flags that need to be added to the link to generate
+      a default manifest
+    - the intermediate manifest that the linker will generate that should be
+      used to assert it doesn't add anything to the merged one.
+    - the list of all the manifest files to be merged by the manifest tool and
+      included into the link."""
+    generate_manifest = self._Setting(('VCLinkerTool', 'GenerateManifest'),
+                                      config,
+                                      default='true')
+    if generate_manifest != 'true':
+      # This means not only that the linker should not generate the intermediate
+      # manifest but also that the manifest tool should do nothing even when
+      # additional manifests are specified.
+      return ['/MANIFEST:NO'], [], []
+
+    output_name = name + '.intermediate.manifest'
+    flags = [
+      '/MANIFEST',
+      '/ManifestFile:' + output_name,
+    ]
+
+    # Instead of using the MANIFESTUAC flags, we generate a .manifest to
+    # include into the list of manifests. This allows us to avoid the need to
+    # do two passes during linking. The /MANIFEST flag and /ManifestFile are
+    # still used, and the intermediate manifest is used to assert that the
+    # final manifest we get from merging all the additional manifest files
+    # (plus the one we generate here) isn't modified by merging the
+    # intermediate into it.
+
+    # Always NO, because we generate a manifest file that has what we want.
+    flags.append('/MANIFESTUAC:NO')
+
+    config = self._TargetConfig(config)
+    enable_uac = self._Setting(('VCLinkerTool', 'EnableUAC'), config,
+                               default='true')
+    manifest_files = []
+    generated_manifest_outer = \
+"<?xml version='1.0' encoding='UTF-8' standalone='yes'?>" \
+"<assembly xmlns='urn:schemas-microsoft-com:asm.v1' manifestVersion='1.0'>%s" \
+"</assembly>"
+    if enable_uac == 'true':
+      execution_level = self._Setting(('VCLinkerTool', 'UACExecutionLevel'),
+                                      config, default='0')
+      execution_level_map = {
+        '0': 'asInvoker',
+        '1': 'highestAvailable',
+        '2': 'requireAdministrator'
+      }
+
+      ui_access = self._Setting(('VCLinkerTool', 'UACUIAccess'), config,
+                                default='false')
+
+      inner = '''
+<trustInfo xmlns="urn:schemas-microsoft-com:asm.v3">
+  <security>
+    <requestedPrivileges>
+      <requestedExecutionLevel level='%s' uiAccess='%s' />
+    </requestedPrivileges>
+  </security>
+</trustInfo>''' % (execution_level_map[execution_level], ui_access)
+    else:
+      inner = ''
+
+    generated_manifest_contents = generated_manifest_outer % inner
+    generated_name = name + '.generated.manifest'
+    # Need to join with the build_dir here as we're writing it during
+    # generation time, but we return the un-joined version because the build
+    # will occur in that directory. We only write the file if the contents
+    # have changed so that simply regenerating the project files doesn't
+    # cause a relink.
+    build_dir_generated_name = os.path.join(build_dir, generated_name)
+    gyp.common.EnsureDirExists(build_dir_generated_name)
+    f = gyp.common.WriteOnDiff(build_dir_generated_name)
+    f.write(generated_manifest_contents)
+    f.close()
+    manifest_files = [generated_name]
+
+    if allow_isolation:
+      flags.append('/ALLOWISOLATION')
+
+    manifest_files += self._GetAdditionalManifestFiles(config,
+                                                       gyp_to_build_path)
+    return flags, output_name, manifest_files
+
+  def _GetAdditionalManifestFiles(self, config, gyp_to_build_path):
+    """Gets additional manifest files that are added to the default one
+    generated by the linker."""
+    files = self._Setting(('VCManifestTool', 'AdditionalManifestFiles'), config,
+                          default=[])
+    if isinstance(files, str):
+      files = files.split(';')
+    return [os.path.normpath(
+                gyp_to_build_path(self.ConvertVSMacros(f, config=config)))
+            for f in files]
+
+  def IsUseLibraryDependencyInputs(self, config):
+    """Returns whether the target should be linked via Use Library Dependency
+    Inputs (using component .objs of a given .lib)."""
+    config = self._TargetConfig(config)
+    uldi = self._Setting(('VCLinkerTool', 'UseLibraryDependencyInputs'), config)
+    return uldi == 'true'
+
+  def IsEmbedManifest(self, config):
+    """Returns whether manifest should be linked into binary."""
+    config = self._TargetConfig(config)
+    embed = self._Setting(('VCManifestTool', 'EmbedManifest'), config,
+                          default='true')
+    return embed == 'true'
+
+  def IsLinkIncremental(self, config):
+    """Returns whether the target should be linked incrementally."""
+    config = self._TargetConfig(config)
+    link_inc = self._Setting(('VCLinkerTool', 'LinkIncremental'), config)
+    return link_inc != '1'
+
+  def GetRcflags(self, config, gyp_to_ninja_path):
+    """Returns the flags that need to be added to invocations of the resource
+    compiler."""
+    config = self._TargetConfig(config)
+    rcflags = []
+    rc = self._GetWrapper(self, self.msvs_settings[config],
+        'VCResourceCompilerTool', append=rcflags)
+    rc('AdditionalIncludeDirectories', map=gyp_to_ninja_path, prefix='/I')
+    rcflags.append('/I' + gyp_to_ninja_path('.'))
+    rc('PreprocessorDefinitions', prefix='/d')
+    # /l arg must be in hex without leading '0x'
+    rc('Culture', prefix='/l', map=lambda x: hex(int(x))[2:])
+    return rcflags
+
+  def BuildCygwinBashCommandLine(self, args, path_to_base):
+    """Build a command line that runs args via cygwin bash. We assume that all
+    incoming paths are in Windows normpath'd form, so they need to be
+    converted to posix style for the part of the command line that's passed to
+    bash. We also have to do some Visual Studio macro emulation here because
+    various rules use magic VS names for things. Also note that rules that
+    contain ninja variables cannot be fixed here (for example ${source}), so
+    the outer generator needs to make sure that the paths that are written out
+    are in posix style, if the command line will be used here."""
+    cygwin_dir = os.path.normpath(
+        os.path.join(path_to_base, self.msvs_cygwin_dirs[0]))
+    cd = ('cd %s' % path_to_base).replace('\\', '/')
+    args = [a.replace('\\', '/').replace('"', '\\"') for a in args]
+    args = ["'%s'" % a.replace("'", "'\\''") for a in args]
+    bash_cmd = ' '.join(args)
+    cmd = (
+        'call "%s\\setup_env.bat" && set CYGWIN=nontsec && ' % cygwin_dir +
+        'bash -c "%s ; %s"' % (cd, bash_cmd))
+    return cmd
+
+  def IsRuleRunUnderCygwin(self, rule):
+    """Determine if an action should be run under cygwin. If the variable is
+    unset, or set to 1 we use cygwin."""
+    return int(rule.get('msvs_cygwin_shell',
+                        self.spec.get('msvs_cygwin_shell', 1))) != 0
+
+  def _HasExplicitRuleForExtension(self, spec, extension):
+    """Determine if there's an explicit rule for a particular extension."""
+    for rule in spec.get('rules', []):
+      if rule['extension'] == extension:
+        return True
+    return False
+
+  def _HasExplicitIdlActions(self, spec):
+    """Determine if an action should not run midl for .idl files."""
+    return any([action.get('explicit_idl_action', 0)
+                for action in spec.get('actions', [])])
+
+  def HasExplicitIdlRulesOrActions(self, spec):
+    """Determine if there's an explicit rule or action for idl files. When
+    there isn't we need to generate implicit rules to build MIDL .idl files."""
+    return (self._HasExplicitRuleForExtension(spec, 'idl') or
+            self._HasExplicitIdlActions(spec))
+
+  def HasExplicitAsmRules(self, spec):
+    """Determine if there's an explicit rule for asm files. When there isn't we
+    need to generate implicit rules to assemble .asm files."""
+    return self._HasExplicitRuleForExtension(spec, 'asm')
+
+  def GetIdlBuildData(self, source, config):
+    """Determine the implicit outputs for an idl file. Returns output
+    directory, outputs, and variables and flags that are required."""
+    config = self._TargetConfig(config)
+    midl_get = self._GetWrapper(self, self.msvs_settings[config], 'VCMIDLTool')
+    def midl(name, default=None):
+      return self.ConvertVSMacros(midl_get(name, default=default),
+                                  config=config)
+    tlb = midl('TypeLibraryName', default='${root}.tlb')
+    header = midl('HeaderFileName', default='${root}.h')
+    dlldata = midl('DLLDataFileName', default='dlldata.c')
+    iid = midl('InterfaceIdentifierFileName', default='${root}_i.c')
+    proxy = midl('ProxyFileName', default='${root}_p.c')
+    # Note that .tlb is not included in the outputs as it is not always
+    # generated depending on the content of the input idl file.
+    outdir = midl('OutputDirectory', default='')
+    output = [header, dlldata, iid, proxy]
+    variables = [('tlb', tlb),
+                 ('h', header),
+                 ('dlldata', dlldata),
+                 ('iid', iid),
+                 ('proxy', proxy)]
+    # TODO(scottmg): Are there configuration settings to set these flags?
+    target_platform = 'win32' if self.GetArch(config) == 'x86' else 'x64'
+    flags = ['/char', 'signed', '/env', target_platform, '/Oicf']
+    return outdir, output, variables, flags
+
+
+def _LanguageMatchesForPch(source_ext, pch_source_ext):
+  c_exts = ('.c',)
+  cc_exts = ('.cc', '.cxx', '.cpp')
+  return ((source_ext in c_exts and pch_source_ext in c_exts) or
+          (source_ext in cc_exts and pch_source_ext in cc_exts))
+
+
+class PrecompiledHeader(object):
+  """Helper to generate dependencies and build rules to handle generation of
+  precompiled headers. Interface matches the GCH handler in xcode_emulation.py.
+  """
+  def __init__(
+      self, settings, config, gyp_to_build_path, gyp_to_unique_output, obj_ext):
+    self.settings = settings
+    self.config = config
+    pch_source = self.settings.msvs_precompiled_source[self.config]
+    self.pch_source = gyp_to_build_path(pch_source)
+    filename, _ = os.path.splitext(pch_source)
+    self.output_obj = gyp_to_unique_output(filename + obj_ext).lower()
+
+  def _PchHeader(self):
+    """Get the header that will appear in an #include line for all source
+    files."""
+    return os.path.split(self.settings.msvs_precompiled_header[self.config])[1]
+
+  def GetObjDependencies(self, sources, objs, arch):
+    """Given a list of sources files and the corresponding object files,
+    returns a list of the pch files that should be depended upon. The
+    additional wrapping in the return value is for interface compatibility
+    with make.py on Mac, and xcode_emulation.py."""
+    assert arch is None
+    if not self._PchHeader():
+      return []
+    pch_ext = os.path.splitext(self.pch_source)[1]
+    for source in sources:
+      if _LanguageMatchesForPch(os.path.splitext(source)[1], pch_ext):
+        return [(None, None, self.output_obj)]
+    return []
+
+  def GetPchBuildCommands(self, arch):
+    """Not used on Windows as there are no additional build steps required
+    (instead, existing steps are modified in GetFlagsModifications below)."""
+    return []
+
+  def GetFlagsModifications(self, input, output, implicit, command,
+                            cflags_c, cflags_cc, expand_special):
+    """Get the modified cflags and implicit dependencies that should be used
+    for the pch compilation step."""
+    if input == self.pch_source:
+      pch_output = ['/Yc' + self._PchHeader()]
+      if command == 'cxx':
+        return ([('cflags_cc', map(expand_special, cflags_cc + pch_output))],
+                self.output_obj, [])
+      elif command == 'cc':
+        return ([('cflags_c', map(expand_special, cflags_c + pch_output))],
+                self.output_obj, [])
+    return [], output, implicit
+
+
+vs_version = None
+def GetVSVersion(generator_flags):
+  global vs_version
+  if not vs_version:
+    vs_version = gyp.MSVSVersion.SelectVisualStudioVersion(
+        generator_flags.get('msvs_version', 'auto'),
+        allow_fallback=False)
+  return vs_version
+
+def _GetVsvarsSetupArgs(generator_flags, arch):
+  vs = GetVSVersion(generator_flags)
+  return vs.SetupScript()
+
+def ExpandMacros(string, expansions):
+  """Expand $(Variable) per expansions dict. See MsvsSettings.GetVSMacroEnv
+  for the canonical way to retrieve a suitable dict."""
+  if '$' in string:
+    for old, new in expansions.iteritems():
+      assert '$(' not in new, new
+      string = string.replace(old, new)
+  return string
+
+def _ExtractImportantEnvironment(output_of_set):
+  """Extracts environment variables required for the toolchain to run from
+  a textual dump output by the cmd.exe 'set' command."""
+  envvars_to_save = (
+      'goma_.*', # TODO(scottmg): This is ugly, but needed for goma.
+      'include',
+      'lib',
+      'libpath',
+      'path',
+      'pathext',
+      'systemroot',
+      'temp',
+      'tmp',
+      )
+  env = {}
+  for line in output_of_set.splitlines():
+    for envvar in envvars_to_save:
+      if re.match(envvar + '=', line.lower()):
+        var, setting = line.split('=', 1)
+        if envvar == 'path':
+          # Our own rules (for running gyp-win-tool) and other actions in
+          # Chromium rely on python being in the path. Add the path to this
+          # python here so that if it's not in the path when ninja is run
+          # later, python will still be found.
+          setting = os.path.dirname(sys.executable) + os.pathsep + setting
+        env[var.upper()] = setting
+        break
+  for required in ('SYSTEMROOT', 'TEMP', 'TMP'):
+    if required not in env:
+      raise Exception('Environment variable "%s" '
+                      'required to be set to valid path' % required)
+  return env
+
+def _FormatAsEnvironmentBlock(envvar_dict):
+  """Format as an 'environment block' directly suitable for CreateProcess.
+  Briefly this is a list of key=value\0, terminated by an additional \0. See
+  CreateProcess documentation for more details."""
+  block = ''
+  nul = '\0'
+  for key, value in envvar_dict.iteritems():
+    block += key + '=' + value + nul
+  block += nul
+  return block
+
+def _ExtractCLPath(output_of_where):
+  """Gets the path to cl.exe based on the output of calling the environment
+  setup batch file, followed by the equivalent of `where`."""
+  # Take the first line, as that's the first found in the PATH.
+  for line in output_of_where.strip().splitlines():
+    if line.startswith('LOC:'):
+      return line[len('LOC:'):].strip()
+
+def GenerateEnvironmentFiles(toplevel_build_dir, generator_flags,
+                             system_includes, open_out):
+  """It's not sufficient to have the absolute path to the compiler, linker,
+  etc. on Windows, as those tools rely on .dlls being in the PATH. We also
+  need to support both x86 and x64 compilers within the same build (to support
+  msvs_target_platform hackery). Different architectures require a different
+  compiler binary, and different supporting environment variables (INCLUDE,
+  LIB, LIBPATH). So, we extract the environment here, wrap all invocations
+  of compiler tools (cl, link, lib, rc, midl, etc.) via win_tool.py which
+  sets up the environment, and then we do not prefix the compiler with
+  an absolute path, instead preferring something like "cl.exe" in the rule
+  which will then run whichever the environment setup has put in the path.
+  When the following procedure to generate environment files does not
+  meet your requirement (e.g. for custom toolchains), you can pass
+  "-G ninja_use_custom_environment_files" to the gyp to suppress file
+  generation and use custom environment files prepared by yourself."""
+  archs = ('x86', 'x64')
+  if generator_flags.get('ninja_use_custom_environment_files', 0):
+    cl_paths = {}
+    for arch in archs:
+      cl_paths[arch] = 'cl.exe'
+    return cl_paths
+  vs = GetVSVersion(generator_flags)
+  cl_paths = {}
+  for arch in archs:
+    # Extract environment variables for subprocesses.
+    args = vs.SetupScript(arch)
+    args.extend(('&&', 'set'))
+    popen = subprocess.Popen(
+        args, shell=True, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
+    variables, _ = popen.communicate()
+    env = _ExtractImportantEnvironment(variables)
+
+    # Inject system includes from gyp files into INCLUDE.
+    if system_includes:
+      system_includes = system_includes | OrderedSet(
+                                              env.get('INCLUDE', '').split(';'))
+      env['INCLUDE'] = ';'.join(system_includes)
+
+    env_block = _FormatAsEnvironmentBlock(env)
+    f = open_out(os.path.join(toplevel_build_dir, 'environment.' + arch), 'wb')
+    f.write(env_block)
+    f.close()
+
+    # Find cl.exe location for this architecture.
+    args = vs.SetupScript(arch)
+    args.extend(('&&',
+      'for', '%i', 'in', '(cl.exe)', 'do', '@echo', 'LOC:%~$PATH:i'))
+    popen = subprocess.Popen(args, shell=True, stdout=subprocess.PIPE)
+    output, _ = popen.communicate()
+    cl_paths[arch] = _ExtractCLPath(output)
+  return cl_paths
+
+def VerifyMissingSources(sources, build_dir, generator_flags, gyp_to_ninja):
+  """Emulate behavior of msvs_error_on_missing_sources present in the msvs
+  generator: Check that all regular source files, i.e. not created at run time,
+  exist on disk. Missing files cause needless recompilation when building via
+  VS, and we want this check to match for people/bots that build using ninja,
+  so they're not surprised when the VS build fails."""
+  if int(generator_flags.get('msvs_error_on_missing_sources', 0)):
+    no_specials = filter(lambda x: '$' not in x, sources)
+    relative = [os.path.join(build_dir, gyp_to_ninja(s)) for s in no_specials]
+    missing = filter(lambda x: not os.path.exists(x), relative)
+    if missing:
+      # They'll look like out\Release\..\..\stuff\things.cc, so normalize the
+      # path for a slightly less crazy looking output.
+      cleaned_up = [os.path.normpath(x) for x in missing]
+      raise Exception('Missing input files:\n%s' % '\n'.join(cleaned_up))
+
+# Sets some values in default_variables, which are required for many
+# generators, run on Windows.
+def CalculateCommonVariables(default_variables, params):
+  generator_flags = params.get('generator_flags', {})
+
+  # Set a variable so conditions can be based on msvs_version.
+  msvs_version = gyp.msvs_emulation.GetVSVersion(generator_flags)
+  default_variables['MSVS_VERSION'] = msvs_version.ShortName()
+
+  # To determine processor word size on Windows, in addition to checking
+  # PROCESSOR_ARCHITECTURE (which reflects the word size of the current
+  # process), it is also necessary to check PROCESSOR_ARCHITEW6432 (which
+  # contains the actual word size of the system when running thru WOW64).
+  if ('64' in os.environ.get('PROCESSOR_ARCHITECTURE', '') or
+      '64' in os.environ.get('PROCESSOR_ARCHITEW6432', '')):
+    default_variables['MSVS_OS_BITS'] = 64
+  else:
+    default_variables['MSVS_OS_BITS'] = 32