Revert "Fix Windows tests when __config_site is present."

It's 2017, and line endings are still an issue.

llvm-svn: 302496

1 files changed, 1113 insertions, 1113 deletions

diff --git a/libcxx/utils/libcxx/test/config.py b/libcxx/utils/libcxx/test/config.py
index a998e21039c..7f1ae851b9c 100644
--- a/libcxx/utils/libcxx/test/config.py
+++ b/libcxx/utils/libcxx/test/config.py
@@ -1,1113 +1,1113 @@
-#===----------------------------------------------------------------------===##

-#

-#                     The LLVM Compiler Infrastructure

-#

-# This file is dual licensed under the MIT and the University of Illinois Open

-# Source Licenses. See LICENSE.TXT for details.

-#

-#===----------------------------------------------------------------------===##

-

-import locale

-import os

-import platform

-import pkgutil

-import pipes

-import re

-import shlex

-import shutil

-import sys

-

-from libcxx.compiler import CXXCompiler

-from libcxx.test.target_info import make_target_info

-from libcxx.test.executor import *

-from libcxx.test.tracing import *

-import libcxx.util

-

-def loadSiteConfig(lit_config, config, param_name, env_name):

-    # We haven't loaded the site specific configuration (the user is

-    # probably trying to run on a test file directly, and either the site

-    # configuration hasn't been created by the build system, or we are in an

-    # out-of-tree build situation).

-    site_cfg = lit_config.params.get(param_name,

-                                     os.environ.get(env_name))

-    if not site_cfg:

-        lit_config.warning('No site specific configuration file found!'

-                           ' Running the tests in the default configuration.')

-    elif not os.path.isfile(site_cfg):

-        lit_config.fatal(

-            "Specified site configuration file does not exist: '%s'" %

-            site_cfg)

-    else:

-        lit_config.note('using site specific configuration at %s' % site_cfg)

-        ld_fn = lit_config.load_config

-

-        # Null out the load_config function so that lit.site.cfg doesn't

-        # recursively load a config even if it tries.

-        # TODO: This is one hell of a hack. Fix it.

-        def prevent_reload_fn(*args, **kwargs):

-            pass

-        lit_config.load_config = prevent_reload_fn

-        ld_fn(config, site_cfg)

-        lit_config.load_config = ld_fn

-

-class Configuration(object):

-    # pylint: disable=redefined-outer-name

-    def __init__(self, lit_config, config):

-        self.lit_config = lit_config

-        self.config = config

-        self.is_windows = platform.system() == 'Windows'

-        self.cxx = None

-        self.cxx_is_clang_cl = None

-        self.cxx_stdlib_under_test = None

-        self.project_obj_root = None

-        self.libcxx_src_root = None

-        self.libcxx_obj_root = None

-        self.cxx_library_root = None

-        self.cxx_runtime_root = None

-        self.abi_library_root = None

-        self.link_shared = self.get_lit_bool('enable_shared', default=True)

-        self.debug_build = self.get_lit_bool('debug_build',   default=False)

-        self.exec_env = {}

-        self.use_target = False

-        self.use_system_cxx_lib = False

-        self.use_clang_verify = False

-        self.long_tests = None

-        self.execute_external = False

-

-    def get_lit_conf(self, name, default=None):

-        val = self.lit_config.params.get(name, None)

-        if val is None:

-            val = getattr(self.config, name, None)

-            if val is None:

-                val = default

-        return val

-

-    def get_lit_bool(self, name, default=None, env_var=None):

-        def check_value(value, var_name):

-            if value is None:

-                return default

-            if isinstance(value, bool):

-                return value

-            if not isinstance(value, str):

-                raise TypeError('expected bool or string')

-            if value.lower() in ('1', 'true'):

-                return True

-            if value.lower() in ('', '0', 'false'):

-                return False

-            self.lit_config.fatal(

-                "parameter '{}' should be true or false".format(var_name))

-

-        conf_val = self.get_lit_conf(name)

-        if env_var is not None and env_var in os.environ and \

-                os.environ[env_var] is not None:

-            val = os.environ[env_var]

-            if conf_val is not None:

-                self.lit_config.warning(

-                    'Environment variable %s=%s is overriding explicit '

-                    '--param=%s=%s' % (env_var, val, name, conf_val))

-            return check_value(val, env_var)

-        return check_value(conf_val, name)

-

-    def make_static_lib_name(self, name):

-        """Return the full filename for the specified library name"""

-        if self.is_windows:

-            assert name == 'c++'  # Only allow libc++ to use this function for now.

-            return 'lib' + name + '.lib'

-        else:

-            return 'lib' + name + '.a'

-

-    def configure(self):

-        self.configure_executor()

-        self.configure_use_system_cxx_lib()

-        self.configure_target_info()

-        self.configure_cxx()

-        self.configure_triple()

-        self.configure_deployment()

-        self.configure_availability()

-        self.configure_src_root()

-        self.configure_obj_root()

-        self.configure_cxx_stdlib_under_test()

-        self.configure_cxx_library_root()

-        self.configure_use_clang_verify()

-        self.configure_use_thread_safety()

-        self.configure_execute_external()

-        self.configure_ccache()

-        self.configure_compile_flags()

-        self.configure_filesystem_compile_flags()

-        self.configure_link_flags()

-        self.configure_env()

-        self.configure_color_diagnostics()

-        self.configure_debug_mode()

-        self.configure_warnings()

-        self.configure_sanitizer()

-        self.configure_coverage()

-        self.configure_modules()

-        self.configure_substitutions()

-        self.configure_features()

-

-    def print_config_info(self):

-        # Print the final compile and link flags.

-        self.lit_config.note('Using compiler: %s' % self.cxx.path)

-        self.lit_config.note('Using flags: %s' % self.cxx.flags)

-        if self.cxx.use_modules:

-            self.lit_config.note('Using modules flags: %s' %

-                                 self.cxx.modules_flags)

-        self.lit_config.note('Using compile flags: %s'

-                             % self.cxx.compile_flags)

-        if len(self.cxx.warning_flags):

-            self.lit_config.note('Using warnings: %s' % self.cxx.warning_flags)

-        self.lit_config.note('Using link flags: %s' % self.cxx.link_flags)

-        # Print as list to prevent "set([...])" from being printed.

-        self.lit_config.note('Using available_features: %s' %

-                             list(self.config.available_features))

-        self.lit_config.note('Using environment: %r' % self.exec_env)

-        sys.stderr.flush()  # Force flushing to avoid broken output on Windows

-

-    def get_test_format(self):

-        from libcxx.test.format import LibcxxTestFormat

-        return LibcxxTestFormat(

-            self.cxx,

-            self.use_clang_verify,

-            self.execute_external,

-            self.executor,

-            exec_env=self.exec_env)

-

-    def configure_executor(self):

-        exec_str = self.get_lit_conf('executor', "None")

-        te = eval(exec_str)

-        if te:

-            self.lit_config.note("Using executor: %r" % exec_str)

-            if self.lit_config.useValgrind:

-                # We have no way of knowing where in the chain the

-                # ValgrindExecutor is supposed to go. It is likely

-                # that the user wants it at the end, but we have no

-                # way of getting at that easily.

-                selt.lit_config.fatal("Cannot infer how to create a Valgrind "

-                                      " executor.")

-        else:

-            te = LocalExecutor()

-            if self.lit_config.useValgrind:

-                te = ValgrindExecutor(self.lit_config.valgrindArgs, te)

-        self.executor = te

-

-    def configure_target_info(self):

-        self.target_info = make_target_info(self)

-

-    def configure_cxx(self):

-        # Gather various compiler parameters.

-        cxx = self.get_lit_conf('cxx_under_test')

-        self.cxx_is_clang_cl = cxx is not None and \

-                               os.path.basename(cxx) == 'clang-cl.exe'

-        # If no specific cxx_under_test was given, attempt to infer it as

-        # clang++.

-        if cxx is None or self.cxx_is_clang_cl:

-            search_paths = self.config.environment['PATH']

-            if cxx is not None and os.path.isabs(cxx):

-                search_paths = os.path.dirname(cxx)

-            clangxx = libcxx.util.which('clang++', search_paths)

-            if clangxx:

-                cxx = clangxx

-                self.lit_config.note(

-                    "inferred cxx_under_test as: %r" % cxx)

-            elif self.cxx_is_clang_cl:

-                self.lit_config.fatal('Failed to find clang++ substitution for'

-                                      ' clang-cl')

-        if not cxx:

-            self.lit_config.fatal('must specify user parameter cxx_under_test '

-                                  '(e.g., --param=cxx_under_test=clang++)')

-        self.cxx = CXXCompiler(cxx) if not self.cxx_is_clang_cl else \

-                   self._configure_clang_cl(cxx)

-        cxx_type = self.cxx.type

-        if cxx_type is not None:

-            assert self.cxx.version is not None

-            maj_v, min_v, _ = self.cxx.version

-            self.config.available_features.add(cxx_type)

-            self.config.available_features.add('%s-%s' % (cxx_type, maj_v))

-            self.config.available_features.add('%s-%s.%s' % (

-                cxx_type, maj_v, min_v))

-        self.cxx.compile_env = dict(os.environ)

-        # 'CCACHE_CPP2' prevents ccache from stripping comments while

-        # preprocessing. This is required to prevent stripping of '-verify'

-        # comments.

-        self.cxx.compile_env['CCACHE_CPP2'] = '1'

-

-    def _configure_clang_cl(self, clang_path):

-        def _split_env_var(var):

-            return [p.strip() for p in os.environ.get(var, '').split(';') if p.strip()]

-

-        def _prefixed_env_list(var, prefix):

-            from itertools import chain

-            return list(chain.from_iterable((prefix, path) for path in _split_env_var(var)))

-

-        assert self.cxx_is_clang_cl

-        flags = []

-        compile_flags = _prefixed_env_list('INCLUDE', '-isystem')

-        link_flags = _prefixed_env_list('LIB', '-L')

-        for path in _split_env_var('LIB'):

-            self.add_path(self.exec_env, path)

-        return CXXCompiler(clang_path, flags=flags,

-                           compile_flags=compile_flags,

-                           link_flags=link_flags)

-

-

-    def configure_src_root(self):

-        self.libcxx_src_root = self.get_lit_conf(

-            'libcxx_src_root', os.path.dirname(self.config.test_source_root))

-

-    def configure_obj_root(self):

-        self.project_obj_root = self.get_lit_conf('project_obj_root')

-        self.libcxx_obj_root = self.get_lit_conf('libcxx_obj_root')

-        if not self.libcxx_obj_root and self.project_obj_root is not None:

-            possible_root = os.path.join(self.project_obj_root, 'projects', 'libcxx')

-            if os.path.isdir(possible_root):

-                self.libcxx_obj_root = possible_root

-            else:

-                self.libcxx_obj_root = self.project_obj_root

-

-    def configure_cxx_library_root(self):

-        self.cxx_library_root = self.get_lit_conf('cxx_library_root',

-                                                  self.libcxx_obj_root)

-        self.cxx_runtime_root = self.get_lit_conf('cxx_runtime_root',

-                                                   self.cxx_library_root)

-

-    def configure_use_system_cxx_lib(self):

-        # This test suite supports testing against either the system library or

-        # the locally built one; the former mode is useful for testing ABI

-        # compatibility between the current headers and a shipping dynamic

-        # library.

-        # Default to testing against the locally built libc++ library.

-        self.use_system_cxx_lib = self.get_lit_conf('use_system_cxx_lib')

-        if self.use_system_cxx_lib == 'true':

-            self.use_system_cxx_lib = True

-        elif self.use_system_cxx_lib == 'false':

-            self.use_system_cxx_lib = False

-        elif self.use_system_cxx_lib:

-            assert os.path.isdir(self.use_system_cxx_lib)

-        self.lit_config.note(

-            "inferred use_system_cxx_lib as: %r" % self.use_system_cxx_lib)

-

-    def configure_availability(self):

-        # See http://llvm.org/docs/AvailabilityMarkup.html

-        self.with_availability = self.get_lit_bool('with_availability', False)

-        self.lit_config.note(

-            "inferred with_availability as: %r" % self.with_availability)

-

-    def configure_cxx_stdlib_under_test(self):

-        self.cxx_stdlib_under_test = self.get_lit_conf(

-            'cxx_stdlib_under_test', 'libc++')

-        if self.cxx_stdlib_under_test not in \

-                ['libc++', 'libstdc++', 'msvc', 'cxx_default']:

-            self.lit_config.fatal(

-                'unsupported value for "cxx_stdlib_under_test": %s'

-                % self.cxx_stdlib_under_test)

-        self.config.available_features.add(self.cxx_stdlib_under_test)

-        if self.cxx_stdlib_under_test == 'libstdc++':

-            self.config.available_features.add('libstdc++')

-            # Manually enable the experimental and filesystem tests for libstdc++

-            # if the options aren't present.

-            # FIXME this is a hack.

-            if self.get_lit_conf('enable_experimental') is None:

-                self.config.enable_experimental = 'true'

-            if self.get_lit_conf('enable_filesystem') is None:

-                self.config.enable_filesystem = 'true'

-

-    def configure_use_clang_verify(self):

-        '''If set, run clang with -verify on failing tests.'''

-        if self.with_availability:

-            self.use_clang_verify = False

-            return

-        self.use_clang_verify = self.get_lit_bool('use_clang_verify')

-        if self.use_clang_verify is None:

-            # NOTE: We do not test for the -verify flag directly because

-            #   -verify will always exit with non-zero on an empty file.

-            self.use_clang_verify = self.cxx.isVerifySupported()

-            self.lit_config.note(

-                "inferred use_clang_verify as: %r" % self.use_clang_verify)

-        if self.use_clang_verify:

-                self.config.available_features.add('verify-support')

-

-    def configure_use_thread_safety(self):

-        '''If set, run clang with -verify on failing tests.'''

-        has_thread_safety = self.cxx.hasCompileFlag('-Werror=thread-safety')

-        if has_thread_safety:

-            self.cxx.compile_flags += ['-Werror=thread-safety']

-            self.config.available_features.add('thread-safety')

-            self.lit_config.note("enabling thread-safety annotations")

-

-    def configure_execute_external(self):

-        # Choose between lit's internal shell pipeline runner and a real shell.

-        # If LIT_USE_INTERNAL_SHELL is in the environment, we use that as the

-        # default value. Otherwise we ask the target_info.

-        use_lit_shell_default = os.environ.get('LIT_USE_INTERNAL_SHELL')

-        if use_lit_shell_default is not None:

-            use_lit_shell_default = use_lit_shell_default != '0'

-        else:

-            use_lit_shell_default = self.target_info.use_lit_shell_default()

-        # Check for the command line parameter using the default value if it is

-        # not present.

-        use_lit_shell = self.get_lit_bool('use_lit_shell',

-                                          use_lit_shell_default)

-        self.execute_external = not use_lit_shell

-

-    def configure_ccache(self):

-        use_ccache_default = os.environ.get('LIBCXX_USE_CCACHE') is not None

-        use_ccache = self.get_lit_bool('use_ccache', use_ccache_default)

-        if use_ccache:

-            self.cxx.use_ccache = True

-            self.lit_config.note('enabling ccache')

-

-    def add_deployment_feature(self, feature):

-        (arch, name, version) = self.config.deployment

-        self.config.available_features.add('%s=%s-%s' % (feature, arch, name))

-        self.config.available_features.add('%s=%s' % (feature, name))

-        self.config.available_features.add('%s=%s%s' % (feature, name, version))

-

-    def configure_features(self):

-        additional_features = self.get_lit_conf('additional_features')

-        if additional_features:

-            for f in additional_features.split(','):

-                self.config.available_features.add(f.strip())

-        self.target_info.add_locale_features(self.config.available_features)

-

-        target_platform = self.target_info.platform()

-

-        # Write an "available feature" that combines the triple when

-        # use_system_cxx_lib is enabled. This is so that we can easily write

-        # XFAIL markers for tests that are known to fail with versions of

-        # libc++ as were shipped with a particular triple.

-        if self.use_system_cxx_lib:

-            self.config.available_features.add('with_system_cxx_lib')

-            self.config.available_features.add(

-                'with_system_cxx_lib=%s' % self.config.target_triple)

-

-            # Add subcomponents individually.

-            target_components = self.config.target_triple.split('-')

-            for component in target_components:

-                self.config.available_features.add(

-                    'with_system_cxx_lib=%s' % component)

-

-            # Add available features for more generic versions of the target

-            # triple attached to  with_system_cxx_lib.

-            if self.use_deployment:

-                self.add_deployment_feature('with_system_cxx_lib')

-

-        # Configure the availability markup checks features.

-        if self.with_availability:

-            self.config.available_features.add('availability_markup')

-            self.add_deployment_feature('availability_markup')

-

-        if self.use_system_cxx_lib or self.with_availability:

-            self.config.available_features.add('availability')

-            self.add_deployment_feature('availability')

-

-        if platform.system() == 'Darwin':

-            self.config.available_features.add('apple-darwin')

-

-        # Insert the platform name into the available features as a lower case.

-        self.config.available_features.add(target_platform)

-

-        # Simulator testing can take a really long time for some of these tests

-        # so add a feature check so we can REQUIRES: long_tests in them

-        self.long_tests = self.get_lit_bool('long_tests')

-        if self.long_tests is None:

-            # Default to running long tests.

-            self.long_tests = True

-            self.lit_config.note(

-                "inferred long_tests as: %r" % self.long_tests)

-

-        if self.long_tests:

-            self.config.available_features.add('long_tests')

-

-        # Run a compile test for the -fsized-deallocation flag. This is needed

-        # in test/std/language.support/support.dynamic/new.delete

-        if self.cxx.hasCompileFlag('-fsized-deallocation'):

-            self.config.available_features.add('fsized-deallocation')

-

-        if self.cxx.hasCompileFlag('-faligned-allocation'):

-            self.config.available_features.add('-faligned-allocation')

-        else:

-            # FIXME remove this once more than just clang-4.0 support

-            # C++17 aligned allocation.

-            self.config.available_features.add('no-aligned-allocation')

-

-        if self.get_lit_bool('has_libatomic', False):

-            self.config.available_features.add('libatomic')

-

-        macros = self.cxx.dumpMacros()

-        if '__cpp_if_constexpr' not in macros:

-            self.config.available_features.add('libcpp-no-if-constexpr')

-

-        if '__cpp_structured_bindings' not in macros:

-            self.config.available_features.add('libcpp-no-structured-bindings')

-

-        if '__cpp_deduction_guides' not in macros:

-            self.config.available_features.add('libcpp-no-deduction-guides')

-

-        if self.is_windows:

-            self.config.available_features.add('windows')

-            if self.cxx_stdlib_under_test == 'libc++':

-                # LIBCXX-WINDOWS-FIXME is the feature name used to XFAIL the

-                # initial Windows failures until they can be properly diagnosed

-                # and fixed. This allows easier detection of new test failures

-                # and regressions. Note: New failures should not be suppressed

-                # using this feature. (Also see llvm.org/PR32730)

-                self.config.available_features.add('LIBCXX-WINDOWS-FIXME')

-

-        # Attempt to detect the glibc version by querying for __GLIBC__

-        # in 'features.h'.

-        macros = self.cxx.dumpMacros(flags=['-include', 'features.h'])

-        if macros is not None and '__GLIBC__' in macros:

-            maj_v, min_v = (macros['__GLIBC__'], macros['__GLIBC_MINOR__'])

-            self.config.available_features.add('glibc')

-            self.config.available_features.add('glibc-%s' % maj_v)

-            self.config.available_features.add('glibc-%s.%s' % (maj_v, min_v))

-

-    def configure_compile_flags(self):

-        no_default_flags = self.get_lit_bool('no_default_flags', False)

-        if not no_default_flags:

-            self.configure_default_compile_flags()

-        # This include is always needed so add so add it regardless of

-        # 'no_default_flags'.

-        support_path = os.path.join(self.libcxx_src_root, 'test/support')

-        self.cxx.compile_flags += ['-I' + support_path]

-        # Configure extra flags

-        compile_flags_str = self.get_lit_conf('compile_flags', '')

-        self.cxx.compile_flags += shlex.split(compile_flags_str)

-        # FIXME: Can we remove this?

-        if self.is_windows:

-            self.cxx.compile_flags += ['-D_CRT_SECURE_NO_WARNINGS']

-

-    def configure_default_compile_flags(self):

-        # Try and get the std version from the command line. Fall back to

-        # default given in lit.site.cfg is not present. If default is not

-        # present then force c++11.

-        std = self.get_lit_conf('std')

-        if not std:

-            # Choose the newest possible language dialect if none is given.

-            possible_stds = ['c++1z', 'c++14', 'c++11', 'c++03']

-            if self.cxx.type == 'gcc':

-                maj_v, _, _ = self.cxx.version

-                maj_v = int(maj_v)

-                if maj_v < 7:

-                    possible_stds.remove('c++1z')

-                # FIXME: How many C++14 tests actually fail under GCC 5 and 6?

-                # Should we XFAIL them individually instead?

-                if maj_v <= 6:

-                    possible_stds.remove('c++14')

-            for s in possible_stds:

-                if self.cxx.hasCompileFlag('-std=%s' % s):

-                    std = s

-                    self.lit_config.note(

-                        'inferred language dialect as: %s' % std)

-                    break

-            if not std:

-                self.lit_config.fatal(

-                    'Failed to infer a supported language dialect from one of %r'

-                    % possible_stds)

-        self.cxx.compile_flags += ['-std={0}'.format(std)]

-        self.config.available_features.add(std.replace('gnu++', 'c++'))

-        # Configure include paths

-        self.configure_compile_flags_header_includes()

-        self.target_info.add_cxx_compile_flags(self.cxx.compile_flags)

-        # Configure feature flags.

-        self.configure_compile_flags_exceptions()

-        self.configure_compile_flags_rtti()

-        self.configure_compile_flags_abi_version()

-        enable_32bit = self.get_lit_bool('enable_32bit', False)

-        if enable_32bit:

-            self.cxx.flags += ['-m32']

-        # Use verbose output for better errors

-        self.cxx.flags += ['-v']

-        sysroot = self.get_lit_conf('sysroot')

-        if sysroot:

-            self.cxx.flags += ['--sysroot', sysroot]

-        gcc_toolchain = self.get_lit_conf('gcc_toolchain')

-        if gcc_toolchain:

-            self.cxx.flags += ['-gcc-toolchain', gcc_toolchain]

-        # NOTE: the _DEBUG definition must preceed the triple check because for

-        # the Windows build of libc++, the forced inclusion of a header requires

-        # that _DEBUG is defined.  Incorrect ordering will result in -target

-        # being elided.

-        if self.is_windows and self.debug_build:

-            self.cxx.compile_flags += ['-D_DEBUG']

-        if self.use_target:

-            if not self.cxx.addFlagIfSupported(

-                    ['-target', self.config.target_triple]):

-                self.lit_config.warning('use_target is true but -target is '\

-                        'not supported by the compiler')

-        if self.use_deployment:

-            arch, name, version = self.config.deployment

-            self.cxx.flags += ['-arch', arch]

-            self.cxx.flags += ['-m' + name + '-version-min=' + version]

-

-        # Disable availability unless explicitely requested

-        if not self.with_availability:

-            self.cxx.flags += ['-D_LIBCPP_DISABLE_AVAILABILITY']

-

-    def configure_compile_flags_header_includes(self):

-        support_path = os.path.join(self.libcxx_src_root, 'test', 'support')

-        self.configure_config_site_header()

-        if self.cxx_stdlib_under_test != 'libstdc++' and \

-           not self.is_windows:

-            self.cxx.compile_flags += [

-                '-include', os.path.join(support_path, 'nasty_macros.hpp')]

-        if self.cxx_stdlib_under_test == 'msvc':

-            self.cxx.compile_flags += [

-                '-include', os.path.join(support_path,

-                                         'msvc_stdlib_force_include.hpp')]

-            pass

-        if self.is_windows and self.debug_build and \

-                self.cxx_stdlib_under_test != 'msvc':

-            self.cxx.compile_flags += [

-                '-include', os.path.join(support_path,

-                                         'set_windows_crt_report_mode.h')

-            ]

-        cxx_headers = self.get_lit_conf('cxx_headers')

-        if cxx_headers == '' or (cxx_headers is None

-                                 and self.cxx_stdlib_under_test != 'libc++'):

-            self.lit_config.note('using the system cxx headers')

-            return

-        self.cxx.compile_flags += ['-nostdinc++']

-        if cxx_headers is None:

-            cxx_headers = os.path.join(self.libcxx_src_root, 'include')

-        if not os.path.isdir(cxx_headers):

-            self.lit_config.fatal("cxx_headers='%s' is not a directory."

-                                  % cxx_headers)

-        self.cxx.compile_flags += ['-I' + cxx_headers]

-        if self.libcxx_obj_root is not None:

-            cxxabi_headers = os.path.join(self.libcxx_obj_root, 'include',

-                                          'c++build')

-            if os.path.isdir(cxxabi_headers):

-                self.cxx.compile_flags += ['-I' + cxxabi_headers]

-

-    def configure_config_site_header(self):

-        # Check for a possible __config_site in the build directory. We

-        # use this if it exists.

-        if self.libcxx_obj_root is None:

-            return

-        config_site_header = os.path.join(self.libcxx_obj_root, '__config_site')

-        if not os.path.isfile(config_site_header):

-            return

-        contained_macros = self.parse_config_site_and_add_features(

-            config_site_header)

-        self.lit_config.note('Using __config_site header %s with macros: %r'

-            % (config_site_header, contained_macros))

-        # FIXME: This must come after the call to

-        # 'parse_config_site_and_add_features(...)' in order for it to work.

-        self.cxx.compile_flags += ['-include', config_site_header]

-

-    def parse_config_site_and_add_features(self, header):

-        """ parse_config_site_and_add_features - Deduce and add the test

-            features that that are implied by the #define's in the __config_site

-            header. Return a dictionary containing the macros found in the

-            '__config_site' header.

-        """

-        # Parse the macro contents of __config_site by dumping the macros

-        # using 'c++ -dM -E' and filtering the predefines.

-        predefines = self.cxx.dumpMacros()

-        macros = self.cxx.dumpMacros(header)

-        feature_macros_keys = set(macros.keys()) - set(predefines.keys())

-        feature_macros = {}

-        for k in feature_macros_keys:

-            feature_macros[k] = macros[k]

-        # We expect the header guard to be one of the definitions

-        assert '_LIBCPP_CONFIG_SITE' in feature_macros

-        del feature_macros['_LIBCPP_CONFIG_SITE']

-        # The __config_site header should be non-empty. Otherwise it should

-        # have never been emitted by CMake.

-        assert len(feature_macros) > 0

-        # Transform each macro name into the feature name used in the tests.

-        # Ex. _LIBCPP_HAS_NO_THREADS -> libcpp-has-no-threads

-        for m in feature_macros:

-            if m == '_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS':

-                continue

-            if m == '_LIBCPP_ABI_VERSION':

-                self.config.available_features.add('libcpp-abi-version-v%s'

-                    % feature_macros[m])

-                continue

-            assert m.startswith('_LIBCPP_HAS_') or m == '_LIBCPP_ABI_UNSTABLE'

-            m = m.lower()[1:].replace('_', '-')

-            self.config.available_features.add(m)

-        return feature_macros

-

-

-

-    def configure_compile_flags_exceptions(self):

-        enable_exceptions = self.get_lit_bool('enable_exceptions', True)

-        if not enable_exceptions:

-            self.config.available_features.add('libcpp-no-exceptions')

-            self.cxx.compile_flags += ['-fno-exceptions']

-

-    def configure_compile_flags_rtti(self):

-        enable_rtti = self.get_lit_bool('enable_rtti', True)

-        if not enable_rtti:

-            self.config.available_features.add('libcpp-no-rtti')

-            self.cxx.compile_flags += ['-fno-rtti', '-D_LIBCPP_NO_RTTI']

-

-    def configure_compile_flags_abi_version(self):

-        abi_version = self.get_lit_conf('abi_version', '').strip()

-        abi_unstable = self.get_lit_bool('abi_unstable')

-        # Only add the ABI version when it is non-default.

-        # FIXME(EricWF): Get the ABI version from the "__config_site".

-        if abi_version and abi_version != '1':

-          self.cxx.compile_flags += ['-D_LIBCPP_ABI_VERSION=' + abi_version]

-        if abi_unstable:

-          self.config.available_features.add('libcpp-abi-unstable')

-          self.cxx.compile_flags += ['-D_LIBCPP_ABI_UNSTABLE']

-

-    def configure_filesystem_compile_flags(self):

-        enable_fs = self.get_lit_bool('enable_filesystem', default=False)

-        if not enable_fs:

-            return

-        enable_experimental = self.get_lit_bool('enable_experimental', default=False)

-        if not enable_experimental:

-            self.lit_config.fatal(

-                'filesystem is enabled but libc++experimental.a is not.')

-        self.config.available_features.add('c++filesystem')

-        static_env = os.path.join(self.libcxx_src_root, 'test', 'std',

-                                  'experimental', 'filesystem', 'Inputs', 'static_test_env')

-        static_env = os.path.realpath(static_env)

-        assert os.path.isdir(static_env)

-        self.cxx.compile_flags += ['-DLIBCXX_FILESYSTEM_STATIC_TEST_ROOT="%s"' % static_env]

-

-        dynamic_env = os.path.join(self.config.test_exec_root,

-                                   'filesystem', 'Output', 'dynamic_env')

-        dynamic_env = os.path.realpath(dynamic_env)

-        if not os.path.isdir(dynamic_env):

-            os.makedirs(dynamic_env)

-        self.cxx.compile_flags += ['-DLIBCXX_FILESYSTEM_DYNAMIC_TEST_ROOT="%s"' % dynamic_env]

-        self.exec_env['LIBCXX_FILESYSTEM_DYNAMIC_TEST_ROOT'] = ("%s" % dynamic_env)

-

-        dynamic_helper = os.path.join(self.libcxx_src_root, 'test', 'support',

-                                      'filesystem_dynamic_test_helper.py')

-        assert os.path.isfile(dynamic_helper)

-

-        self.cxx.compile_flags += ['-DLIBCXX_FILESYSTEM_DYNAMIC_TEST_HELPER="%s %s"'

-                                   % (sys.executable, dynamic_helper)]

-

-

-    def configure_link_flags(self):

-        no_default_flags = self.get_lit_bool('no_default_flags', False)

-        if not no_default_flags:

-            # Configure library path

-            self.configure_link_flags_cxx_library_path()

-            self.configure_link_flags_abi_library_path()

-

-            # Configure libraries

-            if self.cxx_stdlib_under_test == 'libc++':

-                self.cxx.link_flags += ['-nodefaultlibs']

-                # FIXME: Handle MSVCRT as part of the ABI library handling.

-                if self.is_windows:

-                    self.cxx.link_flags += ['-nostdlib']

-                self.configure_link_flags_cxx_library()

-                self.configure_link_flags_abi_library()

-                self.configure_extra_library_flags()

-            elif self.cxx_stdlib_under_test == 'libstdc++':

-                enable_fs = self.get_lit_bool('enable_filesystem',

-                                              default=False)

-                if enable_fs:

-                    self.config.available_features.add('c++experimental')

-                    self.cxx.link_flags += ['-lstdc++fs']

-                self.cxx.link_flags += ['-lm', '-pthread']

-            elif self.cxx_stdlib_under_test == 'msvc':

-                # FIXME: Correctly setup debug/release flags here.

-                pass

-            elif self.cxx_stdlib_under_test == 'cxx_default':

-                self.cxx.link_flags += ['-pthread']

-            else:

-                self.lit_config.fatal(

-                    'unsupported value for "use_stdlib_type": %s'

-                    %  use_stdlib_type)

-

-        link_flags_str = self.get_lit_conf('link_flags', '')

-        self.cxx.link_flags += shlex.split(link_flags_str)

-

-    def configure_link_flags_cxx_library_path(self):

-        if not self.use_system_cxx_lib:

-            if self.cxx_library_root:

-                self.cxx.link_flags += ['-L' + self.cxx_library_root]

-                if self.is_windows and self.link_shared:

-                    self.add_path(self.cxx.compile_env, self.cxx_library_root)

-            if self.cxx_runtime_root:

-                if not self.is_windows:

-                    self.cxx.link_flags += ['-Wl,-rpath,' +

-                                            self.cxx_runtime_root]

-                elif self.is_windows and self.link_shared:

-                    self.add_path(self.exec_env, self.cxx_runtime_root)

-        elif os.path.isdir(str(self.use_system_cxx_lib)):

-            self.cxx.link_flags += ['-L' + self.use_system_cxx_lib]

-            if not self.is_windows:

-                self.cxx.link_flags += ['-Wl,-rpath,' +

-                                        self.use_system_cxx_lib]

-            if self.is_windows and self.link_shared:

-                self.add_path(self.cxx.compile_env, self.use_system_cxx_lib)

-

-    def configure_link_flags_abi_library_path(self):

-        # Configure ABI library paths.

-        self.abi_library_root = self.get_lit_conf('abi_library_path')

-        if self.abi_library_root:

-            self.cxx.link_flags += ['-L' + self.abi_library_root]

-            if not self.is_windows:

-                self.cxx.link_flags += ['-Wl,-rpath,' + self.abi_library_root]

-            else:

-                self.add_path(self.exec_env, self.abi_library_root)

-

-    def configure_link_flags_cxx_library(self):

-        libcxx_experimental = self.get_lit_bool('enable_experimental', default=False)

-        if libcxx_experimental:

-            self.config.available_features.add('c++experimental')

-            self.cxx.link_flags += ['-lc++experimental']

-        if self.link_shared:

-            self.cxx.link_flags += ['-lc++']

-        else:

-            cxx_library_root = self.get_lit_conf('cxx_library_root')

-            if cxx_library_root:

-                libname = self.make_static_lib_name('c++')

-                abs_path = os.path.join(cxx_library_root, libname)

-                assert os.path.exists(abs_path) and \

-                       "static libc++ library does not exist"

-                self.cxx.link_flags += [abs_path]

-            else:

-                self.cxx.link_flags += ['-lc++']

-

-    def configure_link_flags_abi_library(self):

-        cxx_abi = self.get_lit_conf('cxx_abi', 'libcxxabi')

-        if cxx_abi == 'libstdc++':

-            self.cxx.link_flags += ['-lstdc++']

-        elif cxx_abi == 'libsupc++':

-            self.cxx.link_flags += ['-lsupc++']

-        elif cxx_abi == 'libcxxabi':

-            if self.target_info.allow_cxxabi_link():

-                libcxxabi_shared = self.get_lit_bool('libcxxabi_shared', default=True)

-                if libcxxabi_shared:

-                    self.cxx.link_flags += ['-lc++abi']

-                else:

-                    cxxabi_library_root = self.get_lit_conf('abi_library_path')

-                    if cxxabi_library_root:

-                        libname = self.make_static_lib_name('c++abi')

-                        abs_path = os.path.join(cxxabi_library_root, libname)

-                        self.cxx.link_flags += [abs_path]

-                    else:

-                        self.cxx.link_flags += ['-lc++abi']

-        elif cxx_abi == 'libcxxrt':

-            self.cxx.link_flags += ['-lcxxrt']

-        elif cxx_abi == 'vcruntime':

-            debug_suffix = 'd' if self.debug_build else ''

-            self.cxx.link_flags += ['-l%s%s' % (lib, debug_suffix) for lib in

-                                    ['vcruntime', 'ucrt', 'msvcrt']]

-        elif cxx_abi == 'none' or cxx_abi == 'default':

-            if self.is_windows:

-                debug_suffix = 'd' if self.debug_build else ''

-                self.cxx.link_flags += ['-lmsvcrt%s' % debug_suffix]

-        else:

-            self.lit_config.fatal(

-                'C++ ABI setting %s unsupported for tests' % cxx_abi)

-

-    def configure_extra_library_flags(self):

-        if self.get_lit_bool('cxx_ext_threads', default=False):

-            self.cxx.link_flags += ['-lc++external_threads']

-        self.target_info.add_cxx_link_flags(self.cxx.link_flags)

-

-    def configure_color_diagnostics(self):

-        use_color = self.get_lit_conf('color_diagnostics')

-        if use_color is None:

-            use_color = os.environ.get('LIBCXX_COLOR_DIAGNOSTICS')

-        if use_color is None:

-            return

-        if use_color != '':

-            self.lit_config.fatal('Invalid value for color_diagnostics "%s".'

-                                  % use_color)

-        color_flag = '-fdiagnostics-color=always'

-        # Check if the compiler supports the color diagnostics flag. Issue a

-        # warning if it does not since color diagnostics have been requested.

-        if not self.cxx.hasCompileFlag(color_flag):

-            self.lit_config.warning(

-                'color diagnostics have been requested but are not supported '

-                'by the compiler')

-        else:

-            self.cxx.flags += [color_flag]

-

-    def configure_debug_mode(self):

-        debug_level = self.get_lit_conf('debug_level', None)

-        if not debug_level:

-            return

-        if debug_level not in ['0', '1']:

-            self.lit_config.fatal('Invalid value for debug_level "%s".'

-                                  % debug_level)

-        self.cxx.compile_flags += ['-D_LIBCPP_DEBUG=%s' % debug_level]

-

-    def configure_warnings(self):

-        # Turn on warnings by default for Clang based compilers when C++ >= 11

-        default_enable_warnings = self.cxx.type in ['clang', 'apple-clang'] \

-            and len(self.config.available_features.intersection(

-                ['c++11', 'c++14', 'c++1z'])) != 0

-        enable_warnings = self.get_lit_bool('enable_warnings',

-                                            default_enable_warnings)

-        self.cxx.useWarnings(enable_warnings)

-        self.cxx.warning_flags += [

-            '-D_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER',

-            '-Wall', '-Wextra', '-Werror'

-        ]

-        if self.cxx.hasWarningFlag('-Wuser-defined-warnings'):

-            self.cxx.warning_flags += ['-Wuser-defined-warnings']

-            self.config.available_features.add('diagnose-if-support')

-        self.cxx.addWarningFlagIfSupported('-Wshadow')

-        self.cxx.addWarningFlagIfSupported('-Wno-unused-command-line-argument')

-        self.cxx.addWarningFlagIfSupported('-Wno-attributes')

-        self.cxx.addWarningFlagIfSupported('-Wno-pessimizing-move')

-        self.cxx.addWarningFlagIfSupported('-Wno-c++11-extensions')

-        self.cxx.addWarningFlagIfSupported('-Wno-user-defined-literals')

-        self.cxx.addWarningFlagIfSupported('-Wno-noexcept-type')

-        # These warnings should be enabled in order to support the MSVC

-        # team using the test suite; They enable the warnings below and

-        # expect the test suite to be clean.

-        self.cxx.addWarningFlagIfSupported('-Wsign-compare')

-        self.cxx.addWarningFlagIfSupported('-Wunused-variable')

-        self.cxx.addWarningFlagIfSupported('-Wunused-parameter')

-        self.cxx.addWarningFlagIfSupported('-Wunreachable-code')

-        # FIXME: Enable the two warnings below.

-        self.cxx.addWarningFlagIfSupported('-Wno-conversion')

-        self.cxx.addWarningFlagIfSupported('-Wno-unused-local-typedef')

-        std = self.get_lit_conf('std', None)

-        if std in ['c++98', 'c++03']:

-            # The '#define static_assert' provided by libc++ in C++03 mode

-            # causes an unused local typedef whenever it is used.

-            self.cxx.addWarningFlagIfSupported('-Wno-unused-local-typedef')

-

-    def configure_sanitizer(self):

-        san = self.get_lit_conf('use_sanitizer', '').strip()

-        if san:

-            self.target_info.add_sanitizer_features(san, self.config.available_features)

-            # Search for llvm-symbolizer along the compiler path first

-            # and then along the PATH env variable.

-            symbolizer_search_paths = os.environ.get('PATH', '')

-            cxx_path = libcxx.util.which(self.cxx.path)

-            if cxx_path is not None:

-                symbolizer_search_paths = (

-                    os.path.dirname(cxx_path) +

-                    os.pathsep + symbolizer_search_paths)

-            llvm_symbolizer = libcxx.util.which('llvm-symbolizer',

-                                                symbolizer_search_paths)

-

-            def add_ubsan():

-                self.cxx.flags += ['-fsanitize=undefined',

-                                   '-fno-sanitize=vptr,function,float-divide-by-zero',

-                                   '-fno-sanitize-recover=all']

-                self.exec_env['UBSAN_OPTIONS'] = 'print_stacktrace=1'

-                self.config.available_features.add('ubsan')

-

-            # Setup the sanitizer compile flags

-            self.cxx.flags += ['-g', '-fno-omit-frame-pointer']

-            if san == 'Address' or san == 'Address;Undefined' or san == 'Undefined;Address':

-                self.cxx.flags += ['-fsanitize=address']

-                if llvm_symbolizer is not None:

-                    self.exec_env['ASAN_SYMBOLIZER_PATH'] = llvm_symbolizer

-                # FIXME: Turn ODR violation back on after PR28391 is resolved

-                # https://bugs.llvm.org/show_bug.cgi?id=28391

-                self.exec_env['ASAN_OPTIONS'] = 'detect_odr_violation=0'

-                self.config.available_features.add('asan')

-                self.config.available_features.add('sanitizer-new-delete')

-                self.cxx.compile_flags += ['-O1']

-                if san == 'Address;Undefined' or san == 'Undefined;Address':

-                    add_ubsan()

-            elif san == 'Memory' or san == 'MemoryWithOrigins':

-                self.cxx.flags += ['-fsanitize=memory']

-                if san == 'MemoryWithOrigins':

-                    self.cxx.compile_flags += [

-                        '-fsanitize-memory-track-origins']

-                if llvm_symbolizer is not None:

-                    self.exec_env['MSAN_SYMBOLIZER_PATH'] = llvm_symbolizer

-                self.config.available_features.add('msan')

-                self.config.available_features.add('sanitizer-new-delete')

-                self.cxx.compile_flags += ['-O1']

-            elif san == 'Undefined':

-                add_ubsan()

-                self.cxx.compile_flags += ['-O2']

-            elif san == 'Thread':

-                self.cxx.flags += ['-fsanitize=thread']

-                self.config.available_features.add('tsan')

-                self.config.available_features.add('sanitizer-new-delete')

-            else:

-                self.lit_config.fatal('unsupported value for '

-                                      'use_sanitizer: {0}'.format(san))

-            san_lib = self.get_lit_conf('sanitizer_library')

-            if san_lib:

-                self.cxx.link_flags += [

-                    san_lib, '-Wl,-rpath,%s' % os.path.dirname(san_lib)]

-

-    def configure_coverage(self):

-        self.generate_coverage = self.get_lit_bool('generate_coverage', False)

-        if self.generate_coverage:

-            self.cxx.flags += ['-g', '--coverage']

-            self.cxx.compile_flags += ['-O0']

-

-    def configure_modules(self):

-        modules_flags = ['-fmodules']

-        if platform.system() != 'Darwin':

-            modules_flags += ['-Xclang', '-fmodules-local-submodule-visibility']

-        supports_modules = self.cxx.hasCompileFlag(modules_flags)

-        enable_modules = self.get_lit_bool('enable_modules',

-                                           default=False,

-                                           env_var='LIBCXX_ENABLE_MODULES')

-        if enable_modules and not supports_modules:

-            self.lit_config.fatal(

-                '-fmodules is enabled but not supported by the compiler')

-        if not supports_modules:

-            return

-        self.config.available_features.add('modules-support')

-        module_cache = os.path.join(self.config.test_exec_root,

-                                   'modules.cache')

-        module_cache = os.path.realpath(module_cache)

-        if os.path.isdir(module_cache):

-            shutil.rmtree(module_cache)

-        os.makedirs(module_cache)

-        self.cxx.modules_flags = modules_flags + \

-            ['-fmodules-cache-path=' + module_cache]

-        if enable_modules:

-            self.config.available_features.add('-fmodules')

-            self.cxx.useModules()

-

-    def configure_substitutions(self):

-        sub = self.config.substitutions

-        cxx_path = pipes.quote(self.cxx.path)

-        # Configure compiler substitutions

-        sub.append(('%cxx', cxx_path))

-        # Configure flags substitutions

-        flags_str = ' '.join([pipes.quote(f) for f in self.cxx.flags])

-        compile_flags_str = ' '.join([pipes.quote(f) for f in self.cxx.compile_flags])

-        link_flags_str = ' '.join([pipes.quote(f) for f in self.cxx.link_flags])

-        all_flags = '%s %s %s' % (flags_str, compile_flags_str, link_flags_str)

-        sub.append(('%flags', flags_str))

-        sub.append(('%compile_flags', compile_flags_str))

-        sub.append(('%link_flags', link_flags_str))

-        sub.append(('%all_flags', all_flags))

-        if self.cxx.isVerifySupported():

-            verify_str = ' ' + ' '.join(self.cxx.verify_flags) + ' '

-            sub.append(('%verify', verify_str))

-        # Add compile and link shortcuts

-        compile_str = (cxx_path + ' -o %t.o %s -c ' + flags_str

-                       + ' ' + compile_flags_str)

-        link_str = (cxx_path + ' -o %t.exe %t.o ' + flags_str + ' '

-                    + link_flags_str)

-        assert type(link_str) is str

-        build_str = cxx_path + ' -o %t.exe %s ' + all_flags

-        if self.cxx.use_modules:

-            sub.append(('%compile_module', compile_str))

-            sub.append(('%build_module', build_str))

-        elif self.cxx.modules_flags is not None:

-            modules_str = ' '.join(self.cxx.modules_flags) + ' '

-            sub.append(('%compile_module', compile_str + ' ' + modules_str))

-            sub.append(('%build_module', build_str + ' ' + modules_str))

-        sub.append(('%compile', compile_str))

-        sub.append(('%link', link_str))

-        sub.append(('%build', build_str))

-        # Configure exec prefix substitutions.

-        exec_env_str = ''

-        if not self.is_windows and len(self.exec_env) != 0:

-            exec_env_str = 'env '

-            for k, v in self.exec_env.items():

-                exec_env_str += ' %s=%s' % (k, v)

-        # Configure run env substitution.

-        exec_str = exec_env_str

-        if self.lit_config.useValgrind:

-            exec_str = ' '.join(self.lit_config.valgrindArgs) + exec_env_str

-        sub.append(('%exec', exec_str))

-        # Configure run shortcut

-        sub.append(('%run', exec_str + ' %t.exe'))

-        # Configure not program substitutions

-        not_py = os.path.join(self.libcxx_src_root, 'utils', 'not.py')

-        not_str = '%s %s ' % (pipes.quote(sys.executable), pipes.quote(not_py))

-        sub.append(('not ', not_str))

-

-    def can_use_deployment(self):

-        # Check if the host is on an Apple platform using clang.

-        if not self.target_info.platform() == "darwin":

-            return False

-        if not self.target_info.is_host_macosx():

-            return False

-        if not self.cxx.type.endswith('clang'):

-            return False

-        return True

-

-    def configure_triple(self):

-        # Get or infer the target triple.

-        target_triple = self.get_lit_conf('target_triple')

-        self.use_target = self.get_lit_bool('use_target', False)

-        if self.use_target and target_triple:

-            self.lit_config.warning('use_target is true but no triple is specified')

-

-        # Use deployment if possible.

-        self.use_deployment = not self.use_target and self.can_use_deployment()

-        if self.use_deployment:

-            return

-

-        # Save the triple (and warn on Apple platforms).

-        self.config.target_triple = target_triple

-        if self.use_target and 'apple' in target_triple:

-            self.lit_config.warning('consider using arch and platform instead'

-                                    ' of target_triple on Apple platforms')

-

-        # If no target triple was given, try to infer it from the compiler

-        # under test.

-        if not self.config.target_triple:

-            target_triple = self.cxx.getTriple()

-            # Drop sub-major version components from the triple, because the

-            # current XFAIL handling expects exact matches for feature checks.

-            # Example: x86_64-apple-darwin14.0.0 -> x86_64-apple-darwin14

-            # The 5th group handles triples greater than 3 parts

-            # (ex x86_64-pc-linux-gnu).

-            target_triple = re.sub(r'([^-]+)-([^-]+)-([^.]+)([^-]*)(.*)',

-                                   r'\1-\2-\3\5', target_triple)

-            # linux-gnu is needed in the triple to properly identify linuxes

-            # that use GLIBC. Handle redhat and opensuse triples as special

-            # cases and append the missing `-gnu` portion.

-            if (target_triple.endswith('redhat-linux') or

-                target_triple.endswith('suse-linux')):

-                target_triple += '-gnu'

-            self.config.target_triple = target_triple

-            self.lit_config.note(

-                "inferred target_triple as: %r" % self.config.target_triple)

-

-    def configure_deployment(self):

-        assert not self.use_deployment is None

-        assert not self.use_target is None

-        if not self.use_deployment:

-            # Warn about ignored parameters.

-            if self.get_lit_conf('arch'):

-                self.lit_config.warning('ignoring arch, using target_triple')

-            if self.get_lit_conf('platform'):

-                self.lit_config.warning('ignoring platform, using target_triple')

-            return

-

-        assert not self.use_target

-        assert self.target_info.is_host_macosx()

-

-        # Always specify deployment explicitly on Apple platforms, since

-        # otherwise a platform is picked up from the SDK.  If the SDK version

-        # doesn't match the system version, tests that use the system library

-        # may fail spuriously.

-        arch = self.get_lit_conf('arch')

-        if not arch:

-            arch = self.cxx.getTriple().split('-', 1)[0]

-            self.lit_config.note("inferred arch as: %r" % arch)

-

-        inferred_platform, name, version = self.target_info.get_platform()

-        if inferred_platform:

-            self.lit_config.note("inferred platform as: %r" % (name + version))

-        self.config.deployment = (arch, name, version)

-

-        # Set the target triple for use by lit.

-        self.config.target_triple = arch + '-apple-' + name + version

-        self.lit_config.note(

-            "computed target_triple as: %r" % self.config.target_triple)

-

-    def configure_env(self):

-        self.target_info.configure_env(self.exec_env)

-

-    def add_path(self, dest_env, new_path):

-        if 'PATH' not in dest_env:

-            dest_env['PATH'] = new_path

-        else:

-            split_char = ';' if self.is_windows else ':'

-            dest_env['PATH'] = '%s%s%s' % (new_path, split_char,

-                                           dest_env['PATH'])

+#===----------------------------------------------------------------------===##
+#
+#                     The LLVM Compiler Infrastructure
+#
+# This file is dual licensed under the MIT and the University of Illinois Open
+# Source Licenses. See LICENSE.TXT for details.
+#
+#===----------------------------------------------------------------------===##
+
+import locale
+import os
+import platform
+import pkgutil
+import pipes
+import re
+import shlex
+import shutil
+import sys
+
+from libcxx.compiler import CXXCompiler
+from libcxx.test.target_info import make_target_info
+from libcxx.test.executor import *
+from libcxx.test.tracing import *
+import libcxx.util
+
+def loadSiteConfig(lit_config, config, param_name, env_name):
+    # We haven't loaded the site specific configuration (the user is
+    # probably trying to run on a test file directly, and either the site
+    # configuration hasn't been created by the build system, or we are in an
+    # out-of-tree build situation).
+    site_cfg = lit_config.params.get(param_name,
+                                     os.environ.get(env_name))
+    if not site_cfg:
+        lit_config.warning('No site specific configuration file found!'
+                           ' Running the tests in the default configuration.')
+    elif not os.path.isfile(site_cfg):
+        lit_config.fatal(
+            "Specified site configuration file does not exist: '%s'" %
+            site_cfg)
+    else:
+        lit_config.note('using site specific configuration at %s' % site_cfg)
+        ld_fn = lit_config.load_config
+
+        # Null out the load_config function so that lit.site.cfg doesn't
+        # recursively load a config even if it tries.
+        # TODO: This is one hell of a hack. Fix it.
+        def prevent_reload_fn(*args, **kwargs):
+            pass
+        lit_config.load_config = prevent_reload_fn
+        ld_fn(config, site_cfg)
+        lit_config.load_config = ld_fn
+
+class Configuration(object):
+    # pylint: disable=redefined-outer-name
+    def __init__(self, lit_config, config):
+        self.lit_config = lit_config
+        self.config = config
+        self.is_windows = platform.system() == 'Windows'
+        self.cxx = None
+        self.cxx_is_clang_cl = None
+        self.cxx_stdlib_under_test = None
+        self.project_obj_root = None
+        self.libcxx_src_root = None
+        self.libcxx_obj_root = None
+        self.cxx_library_root = None
+        self.cxx_runtime_root = None
+        self.abi_library_root = None
+        self.link_shared = self.get_lit_bool('enable_shared', default=True)
+        self.debug_build = self.get_lit_bool('debug_build',   default=False)
+        self.exec_env = {}
+        self.use_target = False
+        self.use_system_cxx_lib = False
+        self.use_clang_verify = False
+        self.long_tests = None
+        self.execute_external = False
+
+    def get_lit_conf(self, name, default=None):
+        val = self.lit_config.params.get(name, None)
+        if val is None:
+            val = getattr(self.config, name, None)
+            if val is None:
+                val = default
+        return val
+
+    def get_lit_bool(self, name, default=None, env_var=None):
+        def check_value(value, var_name):
+            if value is None:
+                return default
+            if isinstance(value, bool):
+                return value
+            if not isinstance(value, str):
+                raise TypeError('expected bool or string')
+            if value.lower() in ('1', 'true'):
+                return True
+            if value.lower() in ('', '0', 'false'):
+                return False
+            self.lit_config.fatal(
+                "parameter '{}' should be true or false".format(var_name))
+
+        conf_val = self.get_lit_conf(name)
+        if env_var is not None and env_var in os.environ and \
+                os.environ[env_var] is not None:
+            val = os.environ[env_var]
+            if conf_val is not None:
+                self.lit_config.warning(
+                    'Environment variable %s=%s is overriding explicit '
+                    '--param=%s=%s' % (env_var, val, name, conf_val))
+            return check_value(val, env_var)
+        return check_value(conf_val, name)
+
+    def make_static_lib_name(self, name):
+        """Return the full filename for the specified library name"""
+        if self.is_windows:
+            assert name == 'c++'  # Only allow libc++ to use this function for now.
+            return 'lib' + name + '.lib'
+        else:
+            return 'lib' + name + '.a'
+
+    def configure(self):
+        self.configure_executor()
+        self.configure_use_system_cxx_lib()
+        self.configure_target_info()
+        self.configure_cxx()
+        self.configure_triple()
+        self.configure_deployment()
+        self.configure_availability()
+        self.configure_src_root()
+        self.configure_obj_root()
+        self.configure_cxx_stdlib_under_test()
+        self.configure_cxx_library_root()
+        self.configure_use_clang_verify()
+        self.configure_use_thread_safety()
+        self.configure_execute_external()
+        self.configure_ccache()
+        self.configure_compile_flags()
+        self.configure_filesystem_compile_flags()
+        self.configure_link_flags()
+        self.configure_env()
+        self.configure_color_diagnostics()
+        self.configure_debug_mode()
+        self.configure_warnings()
+        self.configure_sanitizer()
+        self.configure_coverage()
+        self.configure_modules()
+        self.configure_substitutions()
+        self.configure_features()
+
+    def print_config_info(self):
+        # Print the final compile and link flags.
+        self.lit_config.note('Using compiler: %s' % self.cxx.path)
+        self.lit_config.note('Using flags: %s' % self.cxx.flags)
+        if self.cxx.use_modules:
+            self.lit_config.note('Using modules flags: %s' %
+                                 self.cxx.modules_flags)
+        self.lit_config.note('Using compile flags: %s'
+                             % self.cxx.compile_flags)
+        if len(self.cxx.warning_flags):
+            self.lit_config.note('Using warnings: %s' % self.cxx.warning_flags)
+        self.lit_config.note('Using link flags: %s' % self.cxx.link_flags)
+        # Print as list to prevent "set([...])" from being printed.
+        self.lit_config.note('Using available_features: %s' %
+                             list(self.config.available_features))
+        self.lit_config.note('Using environment: %r' % self.exec_env)
+        sys.stderr.flush()  # Force flushing to avoid broken output on Windows
+
+    def get_test_format(self):
+        from libcxx.test.format import LibcxxTestFormat
+        return LibcxxTestFormat(
+            self.cxx,
+            self.use_clang_verify,
+            self.execute_external,
+            self.executor,
+            exec_env=self.exec_env)
+
+    def configure_executor(self):
+        exec_str = self.get_lit_conf('executor', "None")
+        te = eval(exec_str)
+        if te:
+            self.lit_config.note("Using executor: %r" % exec_str)
+            if self.lit_config.useValgrind:
+                # We have no way of knowing where in the chain the
+                # ValgrindExecutor is supposed to go. It is likely
+                # that the user wants it at the end, but we have no
+                # way of getting at that easily.
+                selt.lit_config.fatal("Cannot infer how to create a Valgrind "
+                                      " executor.")
+        else:
+            te = LocalExecutor()
+            if self.lit_config.useValgrind:
+                te = ValgrindExecutor(self.lit_config.valgrindArgs, te)
+        self.executor = te
+
+    def configure_target_info(self):
+        self.target_info = make_target_info(self)
+
+    def configure_cxx(self):
+        # Gather various compiler parameters.
+        cxx = self.get_lit_conf('cxx_under_test')
+        self.cxx_is_clang_cl = cxx is not None and \
+                               os.path.basename(cxx) == 'clang-cl.exe'
+        # If no specific cxx_under_test was given, attempt to infer it as
+        # clang++.
+        if cxx is None or self.cxx_is_clang_cl:
+            search_paths = self.config.environment['PATH']
+            if cxx is not None and os.path.isabs(cxx):
+                search_paths = os.path.dirname(cxx)
+            clangxx = libcxx.util.which('clang++', search_paths)
+            if clangxx:
+                cxx = clangxx
+                self.lit_config.note(
+                    "inferred cxx_under_test as: %r" % cxx)
+            elif self.cxx_is_clang_cl:
+                self.lit_config.fatal('Failed to find clang++ substitution for'
+                                      ' clang-cl')
+        if not cxx:
+            self.lit_config.fatal('must specify user parameter cxx_under_test '
+                                  '(e.g., --param=cxx_under_test=clang++)')
+        self.cxx = CXXCompiler(cxx) if not self.cxx_is_clang_cl else \
+                   self._configure_clang_cl(cxx)
+        cxx_type = self.cxx.type
+        if cxx_type is not None:
+            assert self.cxx.version is not None
+            maj_v, min_v, _ = self.cxx.version
+            self.config.available_features.add(cxx_type)
+            self.config.available_features.add('%s-%s' % (cxx_type, maj_v))
+            self.config.available_features.add('%s-%s.%s' % (
+                cxx_type, maj_v, min_v))
+        self.cxx.compile_env = dict(os.environ)
+        # 'CCACHE_CPP2' prevents ccache from stripping comments while
+        # preprocessing. This is required to prevent stripping of '-verify'
+        # comments.
+        self.cxx.compile_env['CCACHE_CPP2'] = '1'
+
+    def _configure_clang_cl(self, clang_path):
+        def _split_env_var(var):
+            return [p.strip() for p in os.environ.get(var, '').split(';') if p.strip()]
+
+        def _prefixed_env_list(var, prefix):
+            from itertools import chain
+            return list(chain.from_iterable((prefix, path) for path in _split_env_var(var)))
+
+        assert self.cxx_is_clang_cl
+        flags = []
+        compile_flags = _prefixed_env_list('INCLUDE', '-isystem')
+        link_flags = _prefixed_env_list('LIB', '-L')
+        for path in _split_env_var('LIB'):
+            self.add_path(self.exec_env, path)
+        return CXXCompiler(clang_path, flags=flags,
+                           compile_flags=compile_flags,
+                           link_flags=link_flags)
+
+
+    def configure_src_root(self):
+        self.libcxx_src_root = self.get_lit_conf(
+            'libcxx_src_root', os.path.dirname(self.config.test_source_root))
+
+    def configure_obj_root(self):
+        self.project_obj_root = self.get_lit_conf('project_obj_root')
+        self.libcxx_obj_root = self.get_lit_conf('libcxx_obj_root')
+        if not self.libcxx_obj_root and self.project_obj_root is not None:
+            possible_root = os.path.join(self.project_obj_root, 'projects', 'libcxx')
+            if os.path.isdir(possible_root):
+                self.libcxx_obj_root = possible_root
+            else:
+                self.libcxx_obj_root = self.project_obj_root
+
+    def configure_cxx_library_root(self):
+        self.cxx_library_root = self.get_lit_conf('cxx_library_root',
+                                                  self.libcxx_obj_root)
+        self.cxx_runtime_root = self.get_lit_conf('cxx_runtime_root',
+                                                   self.cxx_library_root)
+
+    def configure_use_system_cxx_lib(self):
+        # This test suite supports testing against either the system library or
+        # the locally built one; the former mode is useful for testing ABI
+        # compatibility between the current headers and a shipping dynamic
+        # library.
+        # Default to testing against the locally built libc++ library.
+        self.use_system_cxx_lib = self.get_lit_conf('use_system_cxx_lib')
+        if self.use_system_cxx_lib == 'true':
+            self.use_system_cxx_lib = True
+        elif self.use_system_cxx_lib == 'false':
+            self.use_system_cxx_lib = False
+        elif self.use_system_cxx_lib:
+            assert os.path.isdir(self.use_system_cxx_lib)
+        self.lit_config.note(
+            "inferred use_system_cxx_lib as: %r" % self.use_system_cxx_lib)
+
+    def configure_availability(self):
+        # See http://llvm.org/docs/AvailabilityMarkup.html
+        self.with_availability = self.get_lit_bool('with_availability', False)
+        self.lit_config.note(
+            "inferred with_availability as: %r" % self.with_availability)
+
+    def configure_cxx_stdlib_under_test(self):
+        self.cxx_stdlib_under_test = self.get_lit_conf(
+            'cxx_stdlib_under_test', 'libc++')
+        if self.cxx_stdlib_under_test not in \
+                ['libc++', 'libstdc++', 'msvc', 'cxx_default']:
+            self.lit_config.fatal(
+                'unsupported value for "cxx_stdlib_under_test": %s'
+                % self.cxx_stdlib_under_test)
+        self.config.available_features.add(self.cxx_stdlib_under_test)
+        if self.cxx_stdlib_under_test == 'libstdc++':
+            self.config.available_features.add('libstdc++')
+            # Manually enable the experimental and filesystem tests for libstdc++
+            # if the options aren't present.
+            # FIXME this is a hack.
+            if self.get_lit_conf('enable_experimental') is None:
+                self.config.enable_experimental = 'true'
+            if self.get_lit_conf('enable_filesystem') is None:
+                self.config.enable_filesystem = 'true'
+
+    def configure_use_clang_verify(self):
+        '''If set, run clang with -verify on failing tests.'''
+        if self.with_availability:
+            self.use_clang_verify = False
+            return
+        self.use_clang_verify = self.get_lit_bool('use_clang_verify')
+        if self.use_clang_verify is None:
+            # NOTE: We do not test for the -verify flag directly because
+            #   -verify will always exit with non-zero on an empty file.
+            self.use_clang_verify = self.cxx.isVerifySupported()
+            self.lit_config.note(
+                "inferred use_clang_verify as: %r" % self.use_clang_verify)
+        if self.use_clang_verify:
+                self.config.available_features.add('verify-support')
+
+    def configure_use_thread_safety(self):
+        '''If set, run clang with -verify on failing tests.'''
+        has_thread_safety = self.cxx.hasCompileFlag('-Werror=thread-safety')
+        if has_thread_safety:
+            self.cxx.compile_flags += ['-Werror=thread-safety']
+            self.config.available_features.add('thread-safety')
+            self.lit_config.note("enabling thread-safety annotations")
+
+    def configure_execute_external(self):
+        # Choose between lit's internal shell pipeline runner and a real shell.
+        # If LIT_USE_INTERNAL_SHELL is in the environment, we use that as the
+        # default value. Otherwise we ask the target_info.
+        use_lit_shell_default = os.environ.get('LIT_USE_INTERNAL_SHELL')
+        if use_lit_shell_default is not None:
+            use_lit_shell_default = use_lit_shell_default != '0'
+        else:
+            use_lit_shell_default = self.target_info.use_lit_shell_default()
+        # Check for the command line parameter using the default value if it is
+        # not present.
+        use_lit_shell = self.get_lit_bool('use_lit_shell',
+                                          use_lit_shell_default)
+        self.execute_external = not use_lit_shell
+
+    def configure_ccache(self):
+        use_ccache_default = os.environ.get('LIBCXX_USE_CCACHE') is not None
+        use_ccache = self.get_lit_bool('use_ccache', use_ccache_default)
+        if use_ccache:
+            self.cxx.use_ccache = True
+            self.lit_config.note('enabling ccache')
+
+    def add_deployment_feature(self, feature):
+        (arch, name, version) = self.config.deployment
+        self.config.available_features.add('%s=%s-%s' % (feature, arch, name))
+        self.config.available_features.add('%s=%s' % (feature, name))
+        self.config.available_features.add('%s=%s%s' % (feature, name, version))
+
+    def configure_features(self):
+        additional_features = self.get_lit_conf('additional_features')
+        if additional_features:
+            for f in additional_features.split(','):
+                self.config.available_features.add(f.strip())
+        self.target_info.add_locale_features(self.config.available_features)
+
+        target_platform = self.target_info.platform()
+
+        # Write an "available feature" that combines the triple when
+        # use_system_cxx_lib is enabled. This is so that we can easily write
+        # XFAIL markers for tests that are known to fail with versions of
+        # libc++ as were shipped with a particular triple.
+        if self.use_system_cxx_lib:
+            self.config.available_features.add('with_system_cxx_lib')
+            self.config.available_features.add(
+                'with_system_cxx_lib=%s' % self.config.target_triple)
+
+            # Add subcomponents individually.
+            target_components = self.config.target_triple.split('-')
+            for component in target_components:
+                self.config.available_features.add(
+                    'with_system_cxx_lib=%s' % component)
+
+            # Add available features for more generic versions of the target
+            # triple attached to  with_system_cxx_lib.
+            if self.use_deployment:
+                self.add_deployment_feature('with_system_cxx_lib')
+
+        # Configure the availability markup checks features.
+        if self.with_availability:
+            self.config.available_features.add('availability_markup')
+            self.add_deployment_feature('availability_markup')
+
+        if self.use_system_cxx_lib or self.with_availability:
+            self.config.available_features.add('availability')
+            self.add_deployment_feature('availability')
+
+        if platform.system() == 'Darwin':
+            self.config.available_features.add('apple-darwin')
+
+        # Insert the platform name into the available features as a lower case.
+        self.config.available_features.add(target_platform)
+
+        # Simulator testing can take a really long time for some of these tests
+        # so add a feature check so we can REQUIRES: long_tests in them
+        self.long_tests = self.get_lit_bool('long_tests')
+        if self.long_tests is None:
+            # Default to running long tests.
+            self.long_tests = True
+            self.lit_config.note(
+                "inferred long_tests as: %r" % self.long_tests)
+
+        if self.long_tests:
+            self.config.available_features.add('long_tests')
+
+        # Run a compile test for the -fsized-deallocation flag. This is needed
+        # in test/std/language.support/support.dynamic/new.delete
+        if self.cxx.hasCompileFlag('-fsized-deallocation'):
+            self.config.available_features.add('fsized-deallocation')
+
+        if self.cxx.hasCompileFlag('-faligned-allocation'):
+            self.config.available_features.add('-faligned-allocation')
+        else:
+            # FIXME remove this once more than just clang-4.0 support
+            # C++17 aligned allocation.
+            self.config.available_features.add('no-aligned-allocation')
+
+        if self.get_lit_bool('has_libatomic', False):
+            self.config.available_features.add('libatomic')
+
+        macros = self.cxx.dumpMacros()
+        if '__cpp_if_constexpr' not in macros:
+            self.config.available_features.add('libcpp-no-if-constexpr')
+
+        if '__cpp_structured_bindings' not in macros:
+            self.config.available_features.add('libcpp-no-structured-bindings')
+
+        if '__cpp_deduction_guides' not in macros:
+            self.config.available_features.add('libcpp-no-deduction-guides')
+
+        if self.is_windows:
+            self.config.available_features.add('windows')
+            if self.cxx_stdlib_under_test == 'libc++':
+                # LIBCXX-WINDOWS-FIXME is the feature name used to XFAIL the
+                # initial Windows failures until they can be properly diagnosed
+                # and fixed. This allows easier detection of new test failures
+                # and regressions. Note: New failures should not be suppressed
+                # using this feature. (Also see llvm.org/PR32730)
+                self.config.available_features.add('LIBCXX-WINDOWS-FIXME')
+
+        # Attempt to detect the glibc version by querying for __GLIBC__
+        # in 'features.h'.
+        macros = self.cxx.dumpMacros(flags=['-include', 'features.h'])
+        if macros is not None and '__GLIBC__' in macros:
+            maj_v, min_v = (macros['__GLIBC__'], macros['__GLIBC_MINOR__'])
+            self.config.available_features.add('glibc')
+            self.config.available_features.add('glibc-%s' % maj_v)
+            self.config.available_features.add('glibc-%s.%s' % (maj_v, min_v))
+
+    def configure_compile_flags(self):
+        no_default_flags = self.get_lit_bool('no_default_flags', False)
+        if not no_default_flags:
+            self.configure_default_compile_flags()
+        # This include is always needed so add so add it regardless of
+        # 'no_default_flags'.
+        support_path = os.path.join(self.libcxx_src_root, 'test/support')
+        self.cxx.compile_flags += ['-I' + support_path]
+        # Configure extra flags
+        compile_flags_str = self.get_lit_conf('compile_flags', '')
+        self.cxx.compile_flags += shlex.split(compile_flags_str)
+        # FIXME: Can we remove this?
+        if self.is_windows:
+            self.cxx.compile_flags += ['-D_CRT_SECURE_NO_WARNINGS']
+
+    def configure_default_compile_flags(self):
+        # Try and get the std version from the command line. Fall back to
+        # default given in lit.site.cfg is not present. If default is not
+        # present then force c++11.
+        std = self.get_lit_conf('std')
+        if not std:
+            # Choose the newest possible language dialect if none is given.
+            possible_stds = ['c++1z', 'c++14', 'c++11', 'c++03']
+            if self.cxx.type == 'gcc':
+                maj_v, _, _ = self.cxx.version
+                maj_v = int(maj_v)
+                if maj_v < 7:
+                    possible_stds.remove('c++1z')
+                # FIXME: How many C++14 tests actually fail under GCC 5 and 6?
+                # Should we XFAIL them individually instead?
+                if maj_v <= 6:
+                    possible_stds.remove('c++14')
+            for s in possible_stds:
+                if self.cxx.hasCompileFlag('-std=%s' % s):
+                    std = s
+                    self.lit_config.note(
+                        'inferred language dialect as: %s' % std)
+                    break
+            if not std:
+                self.lit_config.fatal(
+                    'Failed to infer a supported language dialect from one of %r'
+                    % possible_stds)
+        self.cxx.compile_flags += ['-std={0}'.format(std)]
+        self.config.available_features.add(std.replace('gnu++', 'c++'))
+        # Configure include paths
+        self.configure_compile_flags_header_includes()
+        self.target_info.add_cxx_compile_flags(self.cxx.compile_flags)
+        # Configure feature flags.
+        self.configure_compile_flags_exceptions()
+        self.configure_compile_flags_rtti()
+        self.configure_compile_flags_abi_version()
+        enable_32bit = self.get_lit_bool('enable_32bit', False)
+        if enable_32bit:
+            self.cxx.flags += ['-m32']
+        # Use verbose output for better errors
+        self.cxx.flags += ['-v']
+        sysroot = self.get_lit_conf('sysroot')
+        if sysroot:
+            self.cxx.flags += ['--sysroot', sysroot]
+        gcc_toolchain = self.get_lit_conf('gcc_toolchain')
+        if gcc_toolchain:
+            self.cxx.flags += ['-gcc-toolchain', gcc_toolchain]
+        # NOTE: the _DEBUG definition must preceed the triple check because for
+        # the Windows build of libc++, the forced inclusion of a header requires
+        # that _DEBUG is defined.  Incorrect ordering will result in -target
+        # being elided.
+        if self.is_windows and self.debug_build:
+            self.cxx.compile_flags += ['-D_DEBUG']
+        if self.use_target:
+            if not self.cxx.addFlagIfSupported(
+                    ['-target', self.config.target_triple]):
+                self.lit_config.warning('use_target is true but -target is '\
+                        'not supported by the compiler')
+        if self.use_deployment:
+            arch, name, version = self.config.deployment
+            self.cxx.flags += ['-arch', arch]
+            self.cxx.flags += ['-m' + name + '-version-min=' + version]
+
+        # Disable availability unless explicitely requested
+        if not self.with_availability:
+            self.cxx.flags += ['-D_LIBCPP_DISABLE_AVAILABILITY']
+
+    def configure_compile_flags_header_includes(self):
+        support_path = os.path.join(self.libcxx_src_root, 'test', 'support')
+        if self.cxx_stdlib_under_test != 'libstdc++' and \
+           not self.is_windows:
+            self.cxx.compile_flags += [
+                '-include', os.path.join(support_path, 'nasty_macros.hpp')]
+        if self.cxx_stdlib_under_test == 'msvc':
+            self.cxx.compile_flags += [
+                '-include', os.path.join(support_path,
+                                         'msvc_stdlib_force_include.hpp')]
+            pass
+        if self.is_windows and self.debug_build and \
+                self.cxx_stdlib_under_test != 'msvc':
+            self.cxx.compile_flags += [
+                '-include', os.path.join(support_path,
+                                         'set_windows_crt_report_mode.h')
+            ]
+        self.configure_config_site_header()
+        cxx_headers = self.get_lit_conf('cxx_headers')
+        if cxx_headers == '' or (cxx_headers is None
+                                 and self.cxx_stdlib_under_test != 'libc++'):
+            self.lit_config.note('using the system cxx headers')
+            return
+        self.cxx.compile_flags += ['-nostdinc++']
+        if cxx_headers is None:
+            cxx_headers = os.path.join(self.libcxx_src_root, 'include')
+        if not os.path.isdir(cxx_headers):
+            self.lit_config.fatal("cxx_headers='%s' is not a directory."
+                                  % cxx_headers)
+        self.cxx.compile_flags += ['-I' + cxx_headers]
+        if self.libcxx_obj_root is not None:
+            cxxabi_headers = os.path.join(self.libcxx_obj_root, 'include',
+                                          'c++build')
+            if os.path.isdir(cxxabi_headers):
+                self.cxx.compile_flags += ['-I' + cxxabi_headers]
+
+    def configure_config_site_header(self):
+        # Check for a possible __config_site in the build directory. We
+        # use this if it exists.
+        if self.libcxx_obj_root is None:
+            return
+        config_site_header = os.path.join(self.libcxx_obj_root, '__config_site')
+        if not os.path.isfile(config_site_header):
+            return
+        contained_macros = self.parse_config_site_and_add_features(
+            config_site_header)
+        self.lit_config.note('Using __config_site header %s with macros: %r'
+            % (config_site_header, contained_macros))
+        # FIXME: This must come after the call to
+        # 'parse_config_site_and_add_features(...)' in order for it to work.
+        self.cxx.compile_flags += ['-include', config_site_header]
+
+    def parse_config_site_and_add_features(self, header):
+        """ parse_config_site_and_add_features - Deduce and add the test
+            features that that are implied by the #define's in the __config_site
+            header. Return a dictionary containing the macros found in the
+            '__config_site' header.
+        """
+        # Parse the macro contents of __config_site by dumping the macros
+        # using 'c++ -dM -E' and filtering the predefines.
+        predefines = self.cxx.dumpMacros()
+        macros = self.cxx.dumpMacros(header)
+        feature_macros_keys = set(macros.keys()) - set(predefines.keys())
+        feature_macros = {}
+        for k in feature_macros_keys:
+            feature_macros[k] = macros[k]
+        # We expect the header guard to be one of the definitions
+        assert '_LIBCPP_CONFIG_SITE' in feature_macros
+        del feature_macros['_LIBCPP_CONFIG_SITE']
+        # The __config_site header should be non-empty. Otherwise it should
+        # have never been emitted by CMake.
+        assert len(feature_macros) > 0
+        # Transform each macro name into the feature name used in the tests.
+        # Ex. _LIBCPP_HAS_NO_THREADS -> libcpp-has-no-threads
+        for m in feature_macros:
+            if m == '_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS':
+                continue
+            if m == '_LIBCPP_ABI_VERSION':
+                self.config.available_features.add('libcpp-abi-version-v%s'
+                    % feature_macros[m])
+                continue
+            assert m.startswith('_LIBCPP_HAS_') or m == '_LIBCPP_ABI_UNSTABLE'
+            m = m.lower()[1:].replace('_', '-')
+            self.config.available_features.add(m)
+        return feature_macros
+
+
+
+    def configure_compile_flags_exceptions(self):
+        enable_exceptions = self.get_lit_bool('enable_exceptions', True)
+        if not enable_exceptions:
+            self.config.available_features.add('libcpp-no-exceptions')
+            self.cxx.compile_flags += ['-fno-exceptions']
+
+    def configure_compile_flags_rtti(self):
+        enable_rtti = self.get_lit_bool('enable_rtti', True)
+        if not enable_rtti:
+            self.config.available_features.add('libcpp-no-rtti')
+            self.cxx.compile_flags += ['-fno-rtti', '-D_LIBCPP_NO_RTTI']
+
+    def configure_compile_flags_abi_version(self):
+        abi_version = self.get_lit_conf('abi_version', '').strip()
+        abi_unstable = self.get_lit_bool('abi_unstable')
+        # Only add the ABI version when it is non-default.
+        # FIXME(EricWF): Get the ABI version from the "__config_site".
+        if abi_version and abi_version != '1':
+          self.cxx.compile_flags += ['-D_LIBCPP_ABI_VERSION=' + abi_version]
+        if abi_unstable:
+          self.config.available_features.add('libcpp-abi-unstable')
+          self.cxx.compile_flags += ['-D_LIBCPP_ABI_UNSTABLE']
+
+    def configure_filesystem_compile_flags(self):
+        enable_fs = self.get_lit_bool('enable_filesystem', default=False)
+        if not enable_fs:
+            return
+        enable_experimental = self.get_lit_bool('enable_experimental', default=False)
+        if not enable_experimental:
+            self.lit_config.fatal(
+                'filesystem is enabled but libc++experimental.a is not.')
+        self.config.available_features.add('c++filesystem')
+        static_env = os.path.join(self.libcxx_src_root, 'test', 'std',
+                                  'experimental', 'filesystem', 'Inputs', 'static_test_env')
+        static_env = os.path.realpath(static_env)
+        assert os.path.isdir(static_env)
+        self.cxx.compile_flags += ['-DLIBCXX_FILESYSTEM_STATIC_TEST_ROOT="%s"' % static_env]
+
+        dynamic_env = os.path.join(self.config.test_exec_root,
+                                   'filesystem', 'Output', 'dynamic_env')
+        dynamic_env = os.path.realpath(dynamic_env)
+        if not os.path.isdir(dynamic_env):
+            os.makedirs(dynamic_env)
+        self.cxx.compile_flags += ['-DLIBCXX_FILESYSTEM_DYNAMIC_TEST_ROOT="%s"' % dynamic_env]
+        self.exec_env['LIBCXX_FILESYSTEM_DYNAMIC_TEST_ROOT'] = ("%s" % dynamic_env)
+
+        dynamic_helper = os.path.join(self.libcxx_src_root, 'test', 'support',
+                                      'filesystem_dynamic_test_helper.py')
+        assert os.path.isfile(dynamic_helper)
+
+        self.cxx.compile_flags += ['-DLIBCXX_FILESYSTEM_DYNAMIC_TEST_HELPER="%s %s"'
+                                   % (sys.executable, dynamic_helper)]
+
+
+    def configure_link_flags(self):
+        no_default_flags = self.get_lit_bool('no_default_flags', False)
+        if not no_default_flags:
+            # Configure library path
+            self.configure_link_flags_cxx_library_path()
+            self.configure_link_flags_abi_library_path()
+
+            # Configure libraries
+            if self.cxx_stdlib_under_test == 'libc++':
+                self.cxx.link_flags += ['-nodefaultlibs']
+                # FIXME: Handle MSVCRT as part of the ABI library handling.
+                if self.is_windows:
+                    self.cxx.link_flags += ['-nostdlib']
+                self.configure_link_flags_cxx_library()
+                self.configure_link_flags_abi_library()
+                self.configure_extra_library_flags()
+            elif self.cxx_stdlib_under_test == 'libstdc++':
+                enable_fs = self.get_lit_bool('enable_filesystem',
+                                              default=False)
+                if enable_fs:
+                    self.config.available_features.add('c++experimental')
+                    self.cxx.link_flags += ['-lstdc++fs']
+                self.cxx.link_flags += ['-lm', '-pthread']
+            elif self.cxx_stdlib_under_test == 'msvc':
+                # FIXME: Correctly setup debug/release flags here.
+                pass
+            elif self.cxx_stdlib_under_test == 'cxx_default':
+                self.cxx.link_flags += ['-pthread']
+            else:
+                self.lit_config.fatal(
+                    'unsupported value for "use_stdlib_type": %s'
+                    %  use_stdlib_type)
+
+        link_flags_str = self.get_lit_conf('link_flags', '')
+        self.cxx.link_flags += shlex.split(link_flags_str)
+
+    def configure_link_flags_cxx_library_path(self):
+        if not self.use_system_cxx_lib:
+            if self.cxx_library_root:
+                self.cxx.link_flags += ['-L' + self.cxx_library_root]
+                if self.is_windows and self.link_shared:
+                    self.add_path(self.cxx.compile_env, self.cxx_library_root)
+            if self.cxx_runtime_root:
+                if not self.is_windows:
+                    self.cxx.link_flags += ['-Wl,-rpath,' +
+                                            self.cxx_runtime_root]
+                elif self.is_windows and self.link_shared:
+                    self.add_path(self.exec_env, self.cxx_runtime_root)
+        elif os.path.isdir(str(self.use_system_cxx_lib)):
+            self.cxx.link_flags += ['-L' + self.use_system_cxx_lib]
+            if not self.is_windows:
+                self.cxx.link_flags += ['-Wl,-rpath,' +
+                                        self.use_system_cxx_lib]
+            if self.is_windows and self.link_shared:
+                self.add_path(self.cxx.compile_env, self.use_system_cxx_lib)
+
+    def configure_link_flags_abi_library_path(self):
+        # Configure ABI library paths.
+        self.abi_library_root = self.get_lit_conf('abi_library_path')
+        if self.abi_library_root:
+            self.cxx.link_flags += ['-L' + self.abi_library_root]
+            if not self.is_windows:
+                self.cxx.link_flags += ['-Wl,-rpath,' + self.abi_library_root]
+            else:
+                self.add_path(self.exec_env, self.abi_library_root)
+
+    def configure_link_flags_cxx_library(self):
+        libcxx_experimental = self.get_lit_bool('enable_experimental', default=False)
+        if libcxx_experimental:
+            self.config.available_features.add('c++experimental')
+            self.cxx.link_flags += ['-lc++experimental']
+        if self.link_shared:
+            self.cxx.link_flags += ['-lc++']
+        else:
+            cxx_library_root = self.get_lit_conf('cxx_library_root')
+            if cxx_library_root:
+                libname = self.make_static_lib_name('c++')
+                abs_path = os.path.join(cxx_library_root, libname)
+                assert os.path.exists(abs_path) and \
+                       "static libc++ library does not exist"
+                self.cxx.link_flags += [abs_path]
+            else:
+                self.cxx.link_flags += ['-lc++']
+
+    def configure_link_flags_abi_library(self):
+        cxx_abi = self.get_lit_conf('cxx_abi', 'libcxxabi')
+        if cxx_abi == 'libstdc++':
+            self.cxx.link_flags += ['-lstdc++']
+        elif cxx_abi == 'libsupc++':
+            self.cxx.link_flags += ['-lsupc++']
+        elif cxx_abi == 'libcxxabi':
+            if self.target_info.allow_cxxabi_link():
+                libcxxabi_shared = self.get_lit_bool('libcxxabi_shared', default=True)
+                if libcxxabi_shared:
+                    self.cxx.link_flags += ['-lc++abi']
+                else:
+                    cxxabi_library_root = self.get_lit_conf('abi_library_path')
+                    if cxxabi_library_root:
+                        libname = self.make_static_lib_name('c++abi')
+                        abs_path = os.path.join(cxxabi_library_root, libname)
+                        self.cxx.link_flags += [abs_path]
+                    else:
+                        self.cxx.link_flags += ['-lc++abi']
+        elif cxx_abi == 'libcxxrt':
+            self.cxx.link_flags += ['-lcxxrt']
+        elif cxx_abi == 'vcruntime':
+            debug_suffix = 'd' if self.debug_build else ''
+            self.cxx.link_flags += ['-l%s%s' % (lib, debug_suffix) for lib in
+                                    ['vcruntime', 'ucrt', 'msvcrt']]
+        elif cxx_abi == 'none' or cxx_abi == 'default':
+            if self.is_windows:
+                debug_suffix = 'd' if self.debug_build else ''
+                self.cxx.link_flags += ['-lmsvcrt%s' % debug_suffix]
+        else:
+            self.lit_config.fatal(
+                'C++ ABI setting %s unsupported for tests' % cxx_abi)
+
+    def configure_extra_library_flags(self):
+        if self.get_lit_bool('cxx_ext_threads', default=False):
+            self.cxx.link_flags += ['-lc++external_threads']
+        self.target_info.add_cxx_link_flags(self.cxx.link_flags)
+
+    def configure_color_diagnostics(self):
+        use_color = self.get_lit_conf('color_diagnostics')
+        if use_color is None:
+            use_color = os.environ.get('LIBCXX_COLOR_DIAGNOSTICS')
+        if use_color is None:
+            return
+        if use_color != '':
+            self.lit_config.fatal('Invalid value for color_diagnostics "%s".'
+                                  % use_color)
+        color_flag = '-fdiagnostics-color=always'
+        # Check if the compiler supports the color diagnostics flag. Issue a
+        # warning if it does not since color diagnostics have been requested.
+        if not self.cxx.hasCompileFlag(color_flag):
+            self.lit_config.warning(
+                'color diagnostics have been requested but are not supported '
+                'by the compiler')
+        else:
+            self.cxx.flags += [color_flag]
+
+    def configure_debug_mode(self):
+        debug_level = self.get_lit_conf('debug_level', None)
+        if not debug_level:
+            return
+        if debug_level not in ['0', '1']:
+            self.lit_config.fatal('Invalid value for debug_level "%s".'
+                                  % debug_level)
+        self.cxx.compile_flags += ['-D_LIBCPP_DEBUG=%s' % debug_level]
+
+    def configure_warnings(self):
+        # Turn on warnings by default for Clang based compilers when C++ >= 11
+        default_enable_warnings = self.cxx.type in ['clang', 'apple-clang'] \
+            and len(self.config.available_features.intersection(
+                ['c++11', 'c++14', 'c++1z'])) != 0
+        enable_warnings = self.get_lit_bool('enable_warnings',
+                                            default_enable_warnings)
+        self.cxx.useWarnings(enable_warnings)
+        self.cxx.warning_flags += [
+            '-D_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER',
+            '-Wall', '-Wextra', '-Werror'
+        ]
+        if self.cxx.hasWarningFlag('-Wuser-defined-warnings'):
+            self.cxx.warning_flags += ['-Wuser-defined-warnings']
+            self.config.available_features.add('diagnose-if-support')
+        self.cxx.addWarningFlagIfSupported('-Wshadow')
+        self.cxx.addWarningFlagIfSupported('-Wno-unused-command-line-argument')
+        self.cxx.addWarningFlagIfSupported('-Wno-attributes')
+        self.cxx.addWarningFlagIfSupported('-Wno-pessimizing-move')
+        self.cxx.addWarningFlagIfSupported('-Wno-c++11-extensions')
+        self.cxx.addWarningFlagIfSupported('-Wno-user-defined-literals')
+        self.cxx.addWarningFlagIfSupported('-Wno-noexcept-type')
+        # These warnings should be enabled in order to support the MSVC
+        # team using the test suite; They enable the warnings below and
+        # expect the test suite to be clean.
+        self.cxx.addWarningFlagIfSupported('-Wsign-compare')
+        self.cxx.addWarningFlagIfSupported('-Wunused-variable')
+        self.cxx.addWarningFlagIfSupported('-Wunused-parameter')
+        self.cxx.addWarningFlagIfSupported('-Wunreachable-code')
+        # FIXME: Enable the two warnings below.
+        self.cxx.addWarningFlagIfSupported('-Wno-conversion')
+        self.cxx.addWarningFlagIfSupported('-Wno-unused-local-typedef')
+        std = self.get_lit_conf('std', None)
+        if std in ['c++98', 'c++03']:
+            # The '#define static_assert' provided by libc++ in C++03 mode
+            # causes an unused local typedef whenever it is used.
+            self.cxx.addWarningFlagIfSupported('-Wno-unused-local-typedef')
+
+    def configure_sanitizer(self):
+        san = self.get_lit_conf('use_sanitizer', '').strip()
+        if san:
+            self.target_info.add_sanitizer_features(san, self.config.available_features)
+            # Search for llvm-symbolizer along the compiler path first
+            # and then along the PATH env variable.
+            symbolizer_search_paths = os.environ.get('PATH', '')
+            cxx_path = libcxx.util.which(self.cxx.path)
+            if cxx_path is not None:
+                symbolizer_search_paths = (
+                    os.path.dirname(cxx_path) +
+                    os.pathsep + symbolizer_search_paths)
+            llvm_symbolizer = libcxx.util.which('llvm-symbolizer',
+                                                symbolizer_search_paths)
+
+            def add_ubsan():
+                self.cxx.flags += ['-fsanitize=undefined',
+                                   '-fno-sanitize=vptr,function,float-divide-by-zero',
+                                   '-fno-sanitize-recover=all']
+                self.exec_env['UBSAN_OPTIONS'] = 'print_stacktrace=1'
+                self.config.available_features.add('ubsan')
+
+            # Setup the sanitizer compile flags
+            self.cxx.flags += ['-g', '-fno-omit-frame-pointer']
+            if san == 'Address' or san == 'Address;Undefined' or san == 'Undefined;Address':
+                self.cxx.flags += ['-fsanitize=address']
+                if llvm_symbolizer is not None:
+                    self.exec_env['ASAN_SYMBOLIZER_PATH'] = llvm_symbolizer
+                # FIXME: Turn ODR violation back on after PR28391 is resolved
+                # https://bugs.llvm.org/show_bug.cgi?id=28391
+                self.exec_env['ASAN_OPTIONS'] = 'detect_odr_violation=0'
+                self.config.available_features.add('asan')
+                self.config.available_features.add('sanitizer-new-delete')
+                self.cxx.compile_flags += ['-O1']
+                if san == 'Address;Undefined' or san == 'Undefined;Address':
+                    add_ubsan()
+            elif san == 'Memory' or san == 'MemoryWithOrigins':
+                self.cxx.flags += ['-fsanitize=memory']
+                if san == 'MemoryWithOrigins':
+                    self.cxx.compile_flags += [
+                        '-fsanitize-memory-track-origins']
+                if llvm_symbolizer is not None:
+                    self.exec_env['MSAN_SYMBOLIZER_PATH'] = llvm_symbolizer
+                self.config.available_features.add('msan')
+                self.config.available_features.add('sanitizer-new-delete')
+                self.cxx.compile_flags += ['-O1']
+            elif san == 'Undefined':
+                add_ubsan()
+                self.cxx.compile_flags += ['-O2']
+            elif san == 'Thread':
+                self.cxx.flags += ['-fsanitize=thread']
+                self.config.available_features.add('tsan')
+                self.config.available_features.add('sanitizer-new-delete')
+            else:
+                self.lit_config.fatal('unsupported value for '
+                                      'use_sanitizer: {0}'.format(san))
+            san_lib = self.get_lit_conf('sanitizer_library')
+            if san_lib:
+                self.cxx.link_flags += [
+                    san_lib, '-Wl,-rpath,%s' % os.path.dirname(san_lib)]
+
+    def configure_coverage(self):
+        self.generate_coverage = self.get_lit_bool('generate_coverage', False)
+        if self.generate_coverage:
+            self.cxx.flags += ['-g', '--coverage']
+            self.cxx.compile_flags += ['-O0']
+
+    def configure_modules(self):
+        modules_flags = ['-fmodules']
+        if platform.system() != 'Darwin':
+            modules_flags += ['-Xclang', '-fmodules-local-submodule-visibility']
+        supports_modules = self.cxx.hasCompileFlag(modules_flags)
+        enable_modules = self.get_lit_bool('enable_modules',
+                                           default=False,
+                                           env_var='LIBCXX_ENABLE_MODULES')
+        if enable_modules and not supports_modules:
+            self.lit_config.fatal(
+                '-fmodules is enabled but not supported by the compiler')
+        if not supports_modules:
+            return
+        self.config.available_features.add('modules-support')
+        module_cache = os.path.join(self.config.test_exec_root,
+                                   'modules.cache')
+        module_cache = os.path.realpath(module_cache)
+        if os.path.isdir(module_cache):
+            shutil.rmtree(module_cache)
+        os.makedirs(module_cache)
+        self.cxx.modules_flags = modules_flags + \
+            ['-fmodules-cache-path=' + module_cache]
+        if enable_modules:
+            self.config.available_features.add('-fmodules')
+            self.cxx.useModules()
+
+    def configure_substitutions(self):
+        sub = self.config.substitutions
+        cxx_path = pipes.quote(self.cxx.path)
+        # Configure compiler substitutions
+        sub.append(('%cxx', cxx_path))
+        # Configure flags substitutions
+        flags_str = ' '.join([pipes.quote(f) for f in self.cxx.flags])
+        compile_flags_str = ' '.join([pipes.quote(f) for f in self.cxx.compile_flags])
+        link_flags_str = ' '.join([pipes.quote(f) for f in self.cxx.link_flags])
+        all_flags = '%s %s %s' % (flags_str, compile_flags_str, link_flags_str)
+        sub.append(('%flags', flags_str))
+        sub.append(('%compile_flags', compile_flags_str))
+        sub.append(('%link_flags', link_flags_str))
+        sub.append(('%all_flags', all_flags))
+        if self.cxx.isVerifySupported():
+            verify_str = ' ' + ' '.join(self.cxx.verify_flags) + ' '
+            sub.append(('%verify', verify_str))
+        # Add compile and link shortcuts
+        compile_str = (cxx_path + ' -o %t.o %s -c ' + flags_str
+                       + ' ' + compile_flags_str)
+        link_str = (cxx_path + ' -o %t.exe %t.o ' + flags_str + ' '
+                    + link_flags_str)
+        assert type(link_str) is str
+        build_str = cxx_path + ' -o %t.exe %s ' + all_flags
+        if self.cxx.use_modules:
+            sub.append(('%compile_module', compile_str))
+            sub.append(('%build_module', build_str))
+        elif self.cxx.modules_flags is not None:
+            modules_str = ' '.join(self.cxx.modules_flags) + ' '
+            sub.append(('%compile_module', compile_str + ' ' + modules_str))
+            sub.append(('%build_module', build_str + ' ' + modules_str))
+        sub.append(('%compile', compile_str))
+        sub.append(('%link', link_str))
+        sub.append(('%build', build_str))
+        # Configure exec prefix substitutions.
+        exec_env_str = ''
+        if not self.is_windows and len(self.exec_env) != 0:
+            exec_env_str = 'env '
+            for k, v in self.exec_env.items():
+                exec_env_str += ' %s=%s' % (k, v)
+        # Configure run env substitution.
+        exec_str = exec_env_str
+        if self.lit_config.useValgrind:
+            exec_str = ' '.join(self.lit_config.valgrindArgs) + exec_env_str
+        sub.append(('%exec', exec_str))
+        # Configure run shortcut
+        sub.append(('%run', exec_str + ' %t.exe'))
+        # Configure not program substitutions
+        not_py = os.path.join(self.libcxx_src_root, 'utils', 'not.py')
+        not_str = '%s %s ' % (pipes.quote(sys.executable), pipes.quote(not_py))
+        sub.append(('not ', not_str))
+
+    def can_use_deployment(self):
+        # Check if the host is on an Apple platform using clang.
+        if not self.target_info.platform() == "darwin":
+            return False
+        if not self.target_info.is_host_macosx():
+            return False
+        if not self.cxx.type.endswith('clang'):
+            return False
+        return True
+
+    def configure_triple(self):
+        # Get or infer the target triple.
+        target_triple = self.get_lit_conf('target_triple')
+        self.use_target = self.get_lit_bool('use_target', False)
+        if self.use_target and target_triple:
+            self.lit_config.warning('use_target is true but no triple is specified')
+
+        # Use deployment if possible.
+        self.use_deployment = not self.use_target and self.can_use_deployment()
+        if self.use_deployment:
+            return
+
+        # Save the triple (and warn on Apple platforms).
+        self.config.target_triple = target_triple
+        if self.use_target and 'apple' in target_triple:
+            self.lit_config.warning('consider using arch and platform instead'
+                                    ' of target_triple on Apple platforms')
+
+        # If no target triple was given, try to infer it from the compiler
+        # under test.
+        if not self.config.target_triple:
+            target_triple = self.cxx.getTriple()
+            # Drop sub-major version components from the triple, because the
+            # current XFAIL handling expects exact matches for feature checks.
+            # Example: x86_64-apple-darwin14.0.0 -> x86_64-apple-darwin14
+            # The 5th group handles triples greater than 3 parts
+            # (ex x86_64-pc-linux-gnu).
+            target_triple = re.sub(r'([^-]+)-([^-]+)-([^.]+)([^-]*)(.*)',
+                                   r'\1-\2-\3\5', target_triple)
+            # linux-gnu is needed in the triple to properly identify linuxes
+            # that use GLIBC. Handle redhat and opensuse triples as special
+            # cases and append the missing `-gnu` portion.
+            if (target_triple.endswith('redhat-linux') or
+                target_triple.endswith('suse-linux')):
+                target_triple += '-gnu'
+            self.config.target_triple = target_triple
+            self.lit_config.note(
+                "inferred target_triple as: %r" % self.config.target_triple)
+
+    def configure_deployment(self):
+        assert not self.use_deployment is None
+        assert not self.use_target is None
+        if not self.use_deployment:
+            # Warn about ignored parameters.
+            if self.get_lit_conf('arch'):
+                self.lit_config.warning('ignoring arch, using target_triple')
+            if self.get_lit_conf('platform'):
+                self.lit_config.warning('ignoring platform, using target_triple')
+            return
+
+        assert not self.use_target
+        assert self.target_info.is_host_macosx()
+
+        # Always specify deployment explicitly on Apple platforms, since
+        # otherwise a platform is picked up from the SDK.  If the SDK version
+        # doesn't match the system version, tests that use the system library
+        # may fail spuriously.
+        arch = self.get_lit_conf('arch')
+        if not arch:
+            arch = self.cxx.getTriple().split('-', 1)[0]
+            self.lit_config.note("inferred arch as: %r" % arch)
+
+        inferred_platform, name, version = self.target_info.get_platform()
+        if inferred_platform:
+            self.lit_config.note("inferred platform as: %r" % (name + version))
+        self.config.deployment = (arch, name, version)
+
+        # Set the target triple for use by lit.
+        self.config.target_triple = arch + '-apple-' + name + version
+        self.lit_config.note(
+            "computed target_triple as: %r" % self.config.target_triple)
+
+    def configure_env(self):
+        self.target_info.configure_env(self.exec_env)
+
+    def add_path(self, dest_env, new_path):
+        if 'PATH' not in dest_env:
+            dest_env['PATH'] = new_path
+        else:
+            split_char = ';' if self.is_windows else ':'
+            dest_env['PATH'] = '%s%s%s' % (new_path, split_char,
+                                           dest_env['PATH'])