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# 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
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."""
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] + "\\"
return dxsdk_dir
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)
self.dxsdk_dir = _FindDirectXInstallation()
# Try to find an installation location for the Windows DDK by checking
# the WDK_DIR environment variable, may be None.
self.wdk_dir = os.environ.get('WDK_DIR')
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_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', ['.'])
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 = self.GetTargetPlatform(config)
target_platform = {'x86': 'Win32'}.get(target_platform, target_platform)
replacements = {
'$(VSInstallDir)': self.vs_version.Path(),
'$(VCInstallDir)': os.path.join(self.vs_version.Path(), 'VC') + '\\',
'$(OutDir)\\': base_to_build + '\\' if base_to_build else '',
'$(IntDir)': '$!INTERMEDIATE_DIR',
'$(InputPath)': '${source}',
'$(InputName)': '${root}',
'$(ProjectName)': self.spec['target_name'],
'$(PlatformName)': target_platform,
}
# Chromium uses DXSDK_DIR in include/lib paths, but it may or may not be
# set. This happens when the SDK is sync'd via src-internal, rather than
# by typical end-user installation of the SDK. If it's not set, we don't
# want to leave the unexpanded variable in the path, so simply strip it.
replacements['$(DXSDK_DIR)'] = self.dxsdk_dir if self.dxsdk_dir else ''
replacements['$(WDK_DIR)'] = self.wdk_dir if self.wdk_dir else ''
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."""
return [lib[2:] if lib.startswith('-l') else lib for lib in libraries]
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 GetTargetPlatform(self, config):
target_platform = self.msvs_target_platform.get(config, '')
if not target_platform:
target_platform = 'Win32'
return {'Win32': 'x86'}.get(target_platform, target_platform)
def _RealConfig(self, config):
target_platform = self.GetTargetPlatform(config)
if target_platform == 'x64' and not config.endswith('_x64'):
config += '_x64'
return config
def _Setting(self, path, config,
default=None, prefix='', append=None, map=None):
"""_GetAndMunge for msvs_settings."""
config = self._RealConfig(config)
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."""
config = self._RealConfig(config)
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._RealConfig(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 GetComputedDefines(self, config):
"""Returns the set of defines that are injected to the defines list based
on other VS settings."""
config = self._RealConfig(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 GetOutputName(self, config, expand_special):
"""Gets the explicitly overridden output name for a target or returns None
if it's not overridden."""
config = self._RealConfig(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 GetCflags(self, config):
"""Returns the flags that need to be added to .c and .cc compilations."""
config = self._RealConfig(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')
cl('InlineFunctionExpansion', prefix='/Ob')
cl('OmitFramePointers', map={'false': '-', 'true': ''}, prefix='/Oy')
cl('FavorSizeOrSpeed', map={'1': 't', '2': 's'}, prefix='/O')
cl('WholeProgramOptimization', map={'true': '/GL'})
cl('WarningLevel', prefix='/W')
cl('WarnAsError', map={'true': '/WX'})
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('AdditionalOptions', prefix='')
# 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 GetPrecompiledHeader(self, config, gyp_to_build_path):
"""Returns an object that handles the generation of precompiled header
build steps."""
config = self._RealConfig(config)
return _PchHelper(self, config, gyp_to_build_path)
def _GetPchFlags(self, config, extension):
"""Get the flags to be added to the cflags for precompiled header support.
"""
config = self._RealConfig(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._RealConfig(config)
return self._GetPchFlags(config, '.c')
def GetCflagsCC(self, config):
"""Returns the flags that need to be added to .cc compilations."""
config = self._RealConfig(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._RealConfig(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._RealConfig(config)
libflags = []
lib = self._GetWrapper(self, self.msvs_settings[config],
'VCLibrarianTool', append=libflags)
libflags.extend(self._GetAdditionalLibraryDirectories(
'VCLibrarianTool', config, gyp_to_build_path))
lib('AdditionalOptions')
return libflags
def _GetDefFileAsLdflags(self, spec, 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 = ''
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:
ldflags.append('/DEF:"%s"' % gyp_to_build_path(def_files[0]))
elif len(def_files) > 1:
raise Exception("Multiple .def files")
def GetLdflags(self, config, gyp_to_build_path, expand_special):
"""Returns the flags that need to be added to link commands."""
config = self._RealConfig(config)
ldflags = []
ld = self._GetWrapper(self, self.msvs_settings[config],
'VCLinkerTool', append=ldflags)
self._GetDefFileAsLdflags(self.spec, ldflags, gyp_to_build_path)
ld('GenerateDebugInformation', map={'true': '/DEBUG'})
ld('TargetMachine', map={'1': 'X86', '17': 'X64'}, prefix='/MACHINE:')
ldflags.extend(self._GetAdditionalLibraryDirectories(
'VCLinkerTool', config, gyp_to_build_path))
ld('DelayLoadDLLs', prefix='/DELAYLOAD:')
out = self.GetOutputName(config, expand_special)
if out:
ldflags.append('/OUT:' + out)
ld('AdditionalOptions', prefix='')
ld('SubSystem', map={'1': 'CONSOLE', '2': 'WINDOWS'}, prefix='/SUBSYSTEM:')
ld('LinkIncremental', map={'1': ':NO', '2': ''}, prefix='/INCREMENTAL')
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('EnableCOMDATFolding', map={'1': 'NOICF', '2': 'ICF'}, prefix='/OPT:')
ld('LinkTimeCodeGeneration', map={'1': '/LTCG'})
ld('IgnoreDefaultLibraryNames', prefix='/NODEFAULTLIB:')
ld('ResourceOnlyDLL', map={'true': '/NOENTRY'})
ld('EntryPointSymbol', prefix='/ENTRY:')
# TODO(scottmg): This should sort of be somewhere else (not really a flag).
ld('AdditionalDependencies', prefix='')
# TODO(scottmg): These too.
ldflags.extend(('kernel32.lib', 'user32.lib', 'gdi32.lib', 'winspool.lib',
'comdlg32.lib', 'advapi32.lib', 'shell32.lib', 'ole32.lib',
'oleaut32.lib', 'uuid.lib', 'odbc32.lib', 'DelayImp.lib'))
# 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')
return ldflags
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._RealConfig(config)
uldi = self._Setting(('VCLinkerTool', 'UseLibraryDependencyInputs'), config)
return uldi == 'true'
def GetRcflags(self, config, gyp_to_ninja_path):
"""Returns the flags that need to be added to invocations of the resource
compiler."""
config = self._RealConfig(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 ${source}), so
the outer generator needs to make sure that the paths that are written out
are in posix style, if the command line will be used here."""
cygwin_dir = os.path.normpath(
os.path.join(path_to_base, self.msvs_cygwin_dirs[0]))
cd = ('cd %s' % path_to_base).replace('\\', '/')
args = [a.replace('\\', '/') for a in args]
args = ["'%s'" % a.replace("'", "\\'") for a in args]
bash_cmd = ' '.join(args)
cmd = (
'call "%s\\setup_env.bat" && set CYGWIN=nontsec && ' % cygwin_dir +
'bash -c "%s ; %s"' % (cd, bash_cmd))
return cmd
def IsRuleRunUnderCygwin(self, rule):
"""Determine if an action should be run under cygwin. If the variable is
unset, or set to 1 we use cygwin."""
return int(rule.get('msvs_cygwin_shell',
self.spec.get('msvs_cygwin_shell', 1))) != 0
def HasExplicitIdlRules(self, spec):
"""Determine if there's an explicit rule for idl files. When there isn't we
need to generate implicit rules to build MIDL .idl files."""
for rule in spec.get('rules', []):
if rule['extension'] == 'idl' and int(rule.get('msvs_external_rule', 0)):
return True
return False
def GetIdlBuildData(self, source, config):
"""Determine the implicit outputs for an idl file. Returns output
directory, outputs, and variables and flags that are required."""
config = self._RealConfig(config)
midl_get = self._GetWrapper(self, self.msvs_settings[config], 'VCMIDLTool')
def midl(name, default=None):
return self.ConvertVSMacros(midl_get(name, default=default),
config=config)
tlb = midl('TypeLibraryName', default='${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='${root}_p.c')
# Note that .tlb is not included in the outputs as it is not always
# generated depending on the content of the input idl file.
outdir = midl('OutputDirectory', default='')
output = [header, dlldata, iid, proxy]
variables = [('tlb', tlb),
('h', header),
('dlldata', dlldata),
('iid', iid),
('proxy', proxy)]
# TODO(scottmg): Are there configuration settings to set these flags?
flags = ['/char', 'signed', '/env', 'win32', '/Oicf']
return outdir, output, variables, flags
def _LanguageMatchesForPch(source_ext, pch_source_ext):
c_exts = ('.c',)
cc_exts = ('.cc', '.cxx', '.cpp')
return ((source_ext in c_exts and pch_source_ext in c_exts) or
(source_ext in cc_exts and pch_source_ext in cc_exts))
class PrecompiledHeader(object):
"""Helper to generate dependencies and build rules to handle generation of
precompiled headers. Interface matches the GCH handler in xcode_emulation.py.
"""
def __init__(self, settings, config, gyp_to_build_path):
self.settings = settings
self.config = config
self.gyp_to_build_path = gyp_to_build_path
def _PchHeader(self):
"""Get the header that will appear in an #include line for all source
files."""
return os.path.split(self.settings.msvs_precompiled_header[self.config])[1]
def _PchSource(self):
"""Get the source file that is built once to compile the pch data."""
return self.gyp_to_build_path(
self.settings.msvs_precompiled_source[self.config])
def _PchOutput(self):
"""Get the name of the output of the compiled pch data."""
return '${pchprefix}.' + self._PchHeader() + '.pch'
def GetObjDependencies(self, sources, objs):
"""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 compatability
with make.py on Mac, and xcode_emulation.py."""
if not self._PchHeader():
return []
source = self._PchSource()
assert source
pch_ext = os.path.splitext(self._PchSource())[1]
for source in sources:
if _LanguageMatchesForPch(os.path.splitext(source)[1], pch_ext):
return [(None, None, self._PchOutput())]
return []
def GetPchBuildCommands(self):
"""Returns [(path_to_pch, language_flag, language, header)].
|path_to_gch| and |header| are relative to the build directory."""
header = self._PchHeader()
source = self._PchSource()
if not source or not header:
return []
ext = os.path.splitext(source)[1]
lang = 'c' if ext == '.c' else 'cc'
return [(self._PchOutput(), '/Yc' + header, lang, source)]
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'))
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] = setting
break
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 GenerateEnvironmentFiles(toplevel_build_dir, generator_flags, 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."""
vs = GetVSVersion(generator_flags)
for arch in ('x86', 'x64'):
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)
env_block = _FormatAsEnvironmentBlock(env)
f = open_out(os.path.join(toplevel_build_dir, 'environment.' + arch), 'wb')
f.write(env_block)
f.close()
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