ydb/build/ymake_conf.py

#!/usr/bin/env python
# coding=utf-8

from __future__ import print_function

import base64
import itertools
import json
import logging
import ntpath
import optparse
import os
import posixpath
import re
import subprocess
import sys
import tempfile

import six

from functools import total_ordering

logger = logging.getLogger(__name__ if __name__ != '__main__' else 'ymake_conf.py')


class WindowsVersion(object):
    """
    Predefined values for _WIN32_WINNT macro.
    This macro specifies minimal Windows version required by the binary being build.

    A complete list of the values supported by the Windows SDK can be found at
    https://docs.microsoft.com/en-us/cpp/porting/modifying-winver-and-win32-winnt
    """
    Windows07 = '0x0601'
    Windows08 = '0x0602'
    Windows10 = '0x0A00'


# This is default Android API level unless `-DANDROID_API` is specified in cmdline
# Android api level can be resolved to Android version using
# https://android.googlesource.com/platform/bionic/+/master/docs/status.md
ANDROID_API_DEFAULT = 21

# This is default Linux SDK unless `-DOS_SDK` is specified in cmdline
LINUX_SDK_DEFAULT = "ubuntu-14"

MACOS_VERSION_MIN = "11.0"
IOS_VERSION_MIN = "13.0"
WINDOWS_VERSION_MIN = WindowsVersion.Windows07


def init_logger(verbose):
    logging.basicConfig(level=logging.DEBUG if verbose else logging.INFO)


def find_conf(conf_file):
    script_dir = os.path.dirname(__file__)
    full_path = os.path.join(script_dir, conf_file)
    if os.path.exists(full_path):
        return full_path
    return None


# All paths in build graph shall be in posix format.
# This ensures that UIDs of cross and native builds won't diverge
# due to paths difference. This function is to be used to fix paths produced
# by os.path.join on Windows.
#
# FIXME: upon complete switch to Python3 os.path.join may be replaced by posixpath.join
#        and this function will become unnecessary
def win_path_fix(path):
    return path if sys.platform != 'win32' else path.replace('\\', '/')


class DebugString(object):
    def __init__(self, get_string_func):
        self.get_string_func = get_string_func

    def __str__(self):
        return self.get_string_func()


class ConfigureError(Exception):
    pass


@total_ordering
class Platform(object):
    def __init__(self, name, os, arch):
        """
        :type name: str
        :type os: str
        :type arch: str
        """
        self.name = name
        self.os = self._parse_os(os)
        self.arch = arch.lower()

        self.is_i386 = self.arch in ('i386', 'x86')
        self.is_i686 = self.arch == 'i686'
        self.is_x86 = self.is_i386 or self.is_i686
        self.is_x86_64 = self.arch in ('x86_64', 'amd64')
        self.is_intel = self.is_x86 or self.is_x86_64

        self.is_armv7 = self.arch in ('armv7', 'armv7a', 'armv7ahf', 'armv7a_neon', 'arm', 'armv7a_cortex_a9', 'armv7ahf_cortex_a35', 'armv7ahf_cortex_a53')
        self.is_armv8 = self.arch in ('armv8', 'armv8a', 'arm64', 'aarch64', 'armv8a_cortex_a35', 'armv8a_cortex_a53')
        self.is_armv8m = self.arch in ('armv8m_cortex_m33', 'armv8m_cortex_m23')
        self.is_armv7em = self.arch in ('armv7em_cortex_m4', 'armv7em_cortex_m7')
        self.is_arm64 = self.arch in ('arm64',)
        self.is_arm = self.is_armv7 or self.is_armv8 or self.is_armv8m or self.is_armv7em
        self.is_armv7_neon = self.arch in ('armv7a_neon', 'armv7ahf', 'armv7a_cortex_a9', 'armv7ahf_cortex_a35', 'armv7ahf_cortex_a53')
        self.is_armv7hf = self.arch in ('armv7ahf', 'armv7ahf_cortex_a35', 'armv7ahf_cortex_a53')
        self.is_armv5te = self.arch in ('armv5te_arm968e_s')

        self.is_rv32imc = self.arch in ('riscv32_esp',)
        self.is_riscv32 = self.is_rv32imc

        self.is_nds32 = self.arch in ('nds32le_elf_mculib_v5f',)
        self.is_tc32 = self.arch in ('tc32_elf',)

        self.is_xtensa = self.arch in ('xtensa_hifi5',)

        self.armv7_float_abi = None
        if self.is_armv7:
            if self.is_armv7hf:
                self.armv7_float_abi = 'hard'
            else:
                self.armv7_float_abi = 'softfp'

        self.is_cortex_a9 = self.arch in ('armv7a_cortex_a9',)
        self.is_cortex_a35 = self.arch in ('armv7ahf_cortex_a35', 'armv8a_cortex_a35')
        self.is_cortex_a53 = self.arch in ('armv7ahf_cortex_a53', 'armv8a_cortex_a53')
        self.is_cortex_m33 = self.arch in ('armv8m_cortex_m33',)
        self.is_cortex_m23 = self.arch in ('armv8m_cortex_m23',)
        self.is_cortex_m4 = self.arch in ('armv7em_cortex_m4',)
        self.is_cortex_m7 = self.arch in ('armv7em_cortex_m7')
        self.is_arm968e_s = self.arch in ('armv5te_arm968e_s')

        self.is_power8le = self.arch == 'ppc64le'
        self.is_power9le = self.arch == 'power9le'
        self.is_powerpc = self.is_power8le or self.is_power9le

        self.is_wasm64 = self.arch == 'wasm64'
        self.is_wasm = self.is_wasm64

        self.is_32_bit = self.is_x86 or self.is_armv5te or self.is_armv7 or self.is_armv8m or self.is_riscv32 or self.is_nds32 or self.is_armv7em or self.is_xtensa or self.is_tc32
        self.is_64_bit = self.is_x86_64 or self.is_armv8 or self.is_powerpc or self.is_wasm64

        assert self.is_32_bit or self.is_64_bit
        assert not (self.is_32_bit and self.is_64_bit)

        self.is_linux = self.os == 'linux' or 'yocto' in self.os
        self.is_linux_x86_64 = self.is_linux and self.is_x86_64
        self.is_linux_armv8 = self.is_linux and self.is_armv8
        self.is_linux_armv7 = self.is_linux and self.is_armv7
        self.is_linux_power8le = self.is_linux and self.is_power8le
        self.is_linux_power9le = self.is_linux and self.is_power9le
        self.is_linux_powerpc = self.is_linux_power8le or self.is_linux_power9le

        self.is_macos = self.os == 'macos'
        self.is_macos_x86_64 = self.is_macos and self.is_x86_64
        self.is_macos_arm64 = self.is_macos and self.is_arm64
        self.is_iossim = self.os == 'iossim' or (self.os == 'ios' and self.is_intel)
        self.is_ios = self.os == 'ios' or self.is_iossim
        self.is_apple = self.is_macos or self.is_ios

        self.is_windows = self.os == 'windows'
        self.is_windows_x86_64 = self.is_windows and self.is_x86_64

        self.is_android = self.os == 'android'
        if self.is_android:
            self.android_api = int(preset('ANDROID_API', ANDROID_API_DEFAULT))

        self.is_cygwin = self.os == 'cygwin'
        self.is_yocto = self.os == 'yocto'
        self.is_emscripten = self.os == 'emscripten'

        self.is_none = self.os == 'none'

        self.is_posix = self.is_linux or self.is_apple or self.is_android or self.is_cygwin or self.is_yocto

    @staticmethod
    def from_json(data):
        name = data.get('visible_name', data['toolchain'])
        return Platform(name, os=data['os'], arch=data['arch'])

    @property
    def os_variables(self):
        # 'LINUX' variable, for backward compatibility
        yield self.os.upper()

        # 'OS_LINUX' variable
        yield 'OS_{}'.format(self.os.upper())

        # yocto is linux
        if 'yocto' in self.os:
            yield 'LINUX'
            yield 'OS_LINUX'

        if self.is_macos:
            yield 'DARWIN'
            yield 'OS_DARWIN'
        if self.is_iossim:
            yield 'IOS'
            yield 'OS_IOS'
            yield 'OS_IOSSIM'

    @property
    def arch_variables(self):
        return select_multiple((
            (self.is_i386 or self.is_i686, 'ARCH_I386'),
            (self.is_i686, 'ARCH_I686'),
            (self.is_x86_64, 'ARCH_X86_64'),
            (self.is_armv7, 'ARCH_ARM7'),
            (self.is_armv7_neon, 'ARCH_ARM7_NEON'),
            (self.is_armv8, 'ARCH_ARM64'),
            (self.is_armv8m, 'ARCH_ARM8M'),
            (self.is_armv7em, 'ARCH_ARM7EM'),
            (self.is_armv5te, 'ARCH_ARM5TE'),
            (self.is_arm, 'ARCH_ARM'),
            (self.is_linux_armv8 or self.is_macos_arm64, 'ARCH_AARCH64'),
            (self.is_powerpc, 'ARCH_PPC64LE'),
            (self.is_power8le, 'ARCH_POWER8LE'),
            (self.is_power9le, 'ARCH_POWER9LE'),
            (self.is_riscv32, 'ARCH_RISCV32'),
            (self.is_xtensa, 'ARCH_XTENSA'),
            (self.is_nds32, 'ARCH_NDS32'),
            (self.is_tc32, 'ARCH_TC32'),
            (self.is_wasm64, 'ARCH_WASM64'),
            (self.is_32_bit, 'ARCH_TYPE_32'),
            (self.is_64_bit, 'ARCH_TYPE_64'),
        ))

    @property
    def library_path_variables(self):
        return ['LD_LIBRARY_PATH', 'DYLD_LIBRARY_PATH']

    def find_in_dict(self, dict_, default=None):
        if dict_ is None:
            return default
        for key in six.iterkeys(dict_):
            if self._parse_os(key) == self.os:
                return dict_[key]
        return default

    @property
    def os_compat(self):
        if self.is_macos:
            return 'DARWIN'
        else:
            return self.os.upper()

    @property
    def canonized_platform(self):
        os = None
        if self.os == 'macos':
            os = 'darwin'
        elif self.os == 'windows':
            os = 'win32'
        else:
            os = self.os
        if self.arch != 'x86_64':
            return '-'.join([os, self.arch])
        else:
            return os

    def exe(self, *paths):
        if self.is_windows:
            return ntpath.join(*itertools.chain(paths[:-1], (paths[-1] + '.exe',)))
        else:
            return posixpath.join(*paths)

    def __str__(self):
        return '{name}-{os}-{arch}'.format(name=self.name, os=self.os, arch=self.arch)

    def __eq__(self, other):
        return (self.name, self.os, self.arch) == (other.name, other.os, other.arch)

    def __lt__(self, other):
        return (self.name, self.os, self.arch) < (other.name, other.os, other.arch)

    def __hash__(self):
        return hash((self.name, self.os, self.arch))

    @staticmethod
    def _parse_os(os):
        os = os.lower()

        if os == 'darwin':
            return 'macos'
        if os in ('win', 'win32', 'win64'):
            return 'windows'
        if os.startswith('cygwin'):
            return 'cygwin'

        return os


def which(prog):
    if os.path.exists(prog) and os.access(prog, os.X_OK):
        return prog

    # Ищем в $PATH только простые команды, без путей.
    if os.path.dirname(prog) != '':
        return None

    path = os.getenv('PATH', '')

    pathext = os.environ.get('PATHEXT')
    # На Windows %PATHEXT% указывает на список расширений, которые нужно проверять
    # при поиске команды в пути. Точное совпадение без расширения имеет приоритет.
    pathext = [''] if pathext is None else [''] + pathext.lower().split(os.pathsep)

    for dir_ in path.split(os.path.pathsep):
        for ext in pathext:
            p = os.path.join(dir_, prog + ext)
            if os.path.exists(p) and os.path.isfile(p) and os.access(p, os.X_OK):
                return win_path_fix(p)

    return None


def get_stdout(command):
    stdout, code = get_stdout_and_code(command)
    return stdout if code == 0 else None


def get_stdout_and_code(command):
    # noinspection PyBroadException
    try:
        process = subprocess.Popen(command, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
        stdout, _ = process.communicate()
        return six.ensure_str(stdout), process.returncode
    except Exception as e:
        logger.info("While run: `%s`", e)
        return None, None


def to_strings(o):
    if isinstance(o, (list, tuple)):
        for s in o:
            for ss in to_strings(s):
                yield ss
    else:
        if o is not None:
            if isinstance(o, bool):
                yield 'yes' if o else 'no'
            elif isinstance(o, (str, int)):
                yield str(o)
            else:
                raise ConfigureError('Unexpected value {} {}'.format(type(o), o))


def emit(key, *value):
    print('{0}={1}'.format(key, ' '.join(to_strings(value))))


def emit_with_comment(comment, key, *value):
    print('# {}'.format(comment))
    emit(key, *value)


def emit_with_ignore_comment(key, *value):
    emit_with_comment('IGNORE YMAKE CONF CONTEXT', key, *value)


def append(key, *value):
    print('{0}+={1}'.format(key, ' '.join(to_strings(value))))


def emit_big(text):
    prefix = None
    first = True
    for line in text.split('\n'):
        if prefix is None:
            if not line:
                continue

            prefix = 0
            while prefix < len(line) and line[prefix] == ' ':
                prefix += 1

        if first:  # Be pretty, prepend an empty line before the output
            print()
            first = False

        print(line[prefix:])


class Variables(dict):
    def emit(self, with_ignore_comment=[]):
        with_ignore_comment_set = set(with_ignore_comment)
        for k in sorted(self.keys()):
            if k in with_ignore_comment_set:
                emit_with_ignore_comment(k, self[k])
            else:
                emit(k, self[k])

    def update_from_presets(self):
        for k in six.iterkeys(self):
            v = preset(k)
            if v is not None:
                self[k] = v

    def reset_if_any(self, value_check=None, reset_value=None):
        if value_check is None:
            def value_check(v_):
                return v_ is None

        if any(map(value_check, six.itervalues(self))):
            for k in six.iterkeys(self):
                self[k] = reset_value


def format_env(env, list_separator=':'):
    def format_value(value):
        return value if isinstance(value, str) else ('\\' + list_separator).join(value)

    def format(kv):
        return '${env:"%s=%s"}' % (kv[0], format_value(kv[1]))

    return ' '.join(map(format, sorted(six.iteritems(env))))


# TODO(somov): Проверить, используется ли это. Может быть, выпилить.
def userify_presets(presets, keys):
    for key in keys:
        user_key = 'USER_{}'.format(key)
        values = [presets.pop(key, None), presets.get(user_key)]
        presets[user_key] = ' '.join(filter(None, values))


def preset(key, default=None):
    return opts().presets.get(key, default)


def is_positive(key):
    return is_positive_str(preset(key, ''))


def is_positive_str(s):
    return s.lower() in ('yes', 'true', 'on', '1')


def is_negative(key):
    return is_negative_str(preset(key, ''))


def is_negative_str(s):
    return s.lower() in ('no', 'false', 'off', '0')


def to_bool(s, default=None):
    if isinstance(s, six.string_types):
        if is_positive_str(s):
            return True
        if is_negative_str(s):
            return False
    if default is None:
        raise ConfigureError('{} is not a bool value'.format(s))
    return default


def select(selectors, default=None, no_default=False):
    for enabled, value in selectors:
        if enabled:
            return value
    if no_default:
        raise ConfigureError()
    return default


def select_multiple(selectors):
    for enabled, value in selectors:
        if enabled:
            yield value


def unique(it):
    known = set()
    for i in it:
        if i not in known:
            known.add(i)
            yield i


class Options(object):
    def __init__(self, argv):
        def parse_presets(raw_presets):
            presets = {}
            for p in raw_presets:
                toks = p.split('=', 1)
                name = toks[0]
                value = toks[1] if len(toks) >= 2 else ''
                presets[name] = value
            return presets

        parser = optparse.OptionParser(add_help_option=False)
        opt_group = optparse.OptionGroup(parser, 'Conf script options')
        opt_group.add_option('--toolchain-params', dest='toolchain_params', action='store', help='Set toolchain params via file')
        opt_group.add_option('-D', '--preset', dest='presets', action='append', default=[], help='set or override presets')
        opt_group.add_option('-l', '--local-distbuild', dest='local_distbuild', action='store_true', default=False, help='conf for local distbuild')
        parser.add_option_group(opt_group)

        self.options, self.arguments = parser.parse_args(argv)

        argv = self.arguments
        if len(argv) < 4:
            print('Usage: ArcRoot, --BuildType--, Verbosity, [Path to local.ymake]', file=sys.stderr)
            sys.exit(1)

        self.arcadia_root = argv[1]
        init_logger(argv[3] == 'verbose')

        # Эти переменные не надо использоваться напрямую. Их значения уже разбираются в других местах.
        self.build_type = argv[2].lower()
        self.local_distbuild = self.options.local_distbuild
        self.toolchain_params = self.options.toolchain_params

        self.presets = parse_presets(self.options.presets)
        userify_presets(self.presets, ('CFLAGS', 'CXXFLAGS', 'CONLYFLAGS', 'LDFLAGS', 'GO_COMPILE_FLAGS', 'GO_LINK_FLAGS', 'STD_CXX_VERSION'))

    Instance = None


def opts():
    if Options.Instance is None:
        Options.Instance = Options(sys.argv)
    return Options.Instance


class Profiler(object):
    Generic = 'generic'
    GProf = 'gprof'


class Arcadia(object):
    def __init__(self, root):
        self.root = root


class Build(object):
    def __init__(self, arcadia, build_type, toolchain_params, force_ignore_local_files=False):
        self.arcadia = arcadia
        self.params = self._load_json_from_base64(toolchain_params)
        self.build_type = build_type

        platform = self.params['platform']
        self.host = Platform.from_json(platform['host'])
        self.target = Platform.from_json(platform['target'])

        self.tc = self._get_toolchain_options()

        # TODO(somov): Удалить, когда перестанет использоваться.
        self.build_system = 'ymake'

        self.ignore_local_files = False

        dist_prefix = 'dist-'
        if self.build_type.startswith(dist_prefix):
            self.build_system = 'distbuild'
            self.build_type = self.build_type[len(dist_prefix):]

        if force_ignore_local_files:
            self.ignore_local_files = True

        if self.is_ide_build_type(self.build_type):
            self.ignore_local_files = True

        self.pic = not is_positive('FORCE_NO_PIC')

    @property
    def host_target(self):
        return self.host, self.target

    def print_build(self):
        self._print_build_settings()

        host_os = System(self.host)
        host_os.print_host_settings()

        target_os = System(self.target)
        target_os.print_target_settings()

        if self.pic:
            emit('PIC', 'yes')

        emit('COMPILER_ID', self.tc.type.upper())

        if self.is_valgrind:
            emit('WITH_VALGRIND', 'yes')

        if self.is_coverage:
            emit('_BUILD_COVERAGE', 'yes')

        if self.is_debug:
            emit('_BUILD_DEBUG', 'yes')

        if self.is_fast_debug:
            emit('_BUILD_FAST_DEBUG', 'yes')

        if self.is_release:
            emit('_BUILD_RELEASE', 'yes')

        if self.is_sanitized:
            emit('_BUILD_SANITIZED', 'yes')

        if self.is_size_optimized:
            emit('_BUILD_SIZE_OPTIMIZED', 'yes')

        if self.with_ndebug:
            emit('_BUILD_WITH_NDEBUG', 'yes')

        toolchain_type, compiler_type, linker_type = Compilers[self.tc.type]
        toolchain = toolchain_type(self.tc, self)
        compiler = compiler_type(self.tc, self)
        linker = linker_type(self.tc, self)

        toolchain.print_toolchain()
        compiler.print_compiler()
        linker.print_linker()

        self._print_other_settings(compiler)

    def _print_build_settings(self):
        emit('BUILD_TYPE', self.build_type.upper())
        emit('BT_' + self.build_type.upper().replace('-', '_'), 'yes')

        if self.build_system == 'distbuild':
            emit('DISTBUILD', 'yes')
        elif self.build_system != 'ymake':
            raise ConfigureError()

        python_bin = preset('BUILD_PYTHON_BIN', '$(PYTHON)/python')

        emit('YMAKE_PYTHON', python_bin)
        emit('YMAKE_UNPICKLER', python_bin, '$ARCADIA_ROOT/build/plugins/_unpickler.py')

    @property
    def is_release(self):
        # TODO(somov): Проверить, бывают ли тут суффиксы на самом деле
        return self.build_type in ('release', 'relwithdebinfo', 'minsizerel', 'profile', 'gprof') or self.build_type.endswith('-release')

    @property
    def is_debug(self):
        return self.build_type in ('debug', 'debugnoasserts', 'fastdebug') or self.build_type.endswith('-debug')

    @property
    def is_fast_debug(self):
        return self.build_type == 'fastdebug'

    @property
    def is_size_optimized(self):
        return self.build_type == 'minsizerel'

    @property
    def is_coverage(self):
        return self.build_type == 'coverage'

    @property
    def is_sanitized(self):
        sanitizer = preset('SANITIZER_TYPE')
        return bool(sanitizer) and not is_negative_str(sanitizer)

    @property
    def with_ndebug(self):
        return self.build_type in ('release', 'minsizerel', 'valgrind-release', 'profile', 'gprof', 'debugnoasserts')

    @property
    def is_valgrind(self):
        return self.build_type == 'valgrind' or self.build_type == 'valgrind-release'

    @property
    def is_ide(self):
        return self.is_ide_build_type(self.build_type)

    @property
    def profiler_type(self):
        if self.build_type == 'profile':
            return Profiler.Generic
        elif self.build_type == 'gprof':
            return Profiler.GProf
        else:
            return None

    @staticmethod
    def is_ide_build_type(build_type):
        return build_type == 'nobuild'

    def _configure_runtime_versions(self):
        try:
            res = subprocess.check_output(['xcrun', 'simctl', 'list', '--json', 'runtimes'])
        except subprocess.CalledProcessError as exc:
            logger.warning(exc)
            return
        raw_object = json.loads(res)
        raw_object = raw_object['runtimes']
        for runtime in raw_object:
            if runtime['isAvailable']:
                if "iOS" in runtime['identifier']:
                    emit('DEFAULT_IOS_RUNTIME', '{}'.format(runtime['identifier']))

    def _get_toolchain_options(self):
        type_ = self.params['params']['type']

        if self.params['params'].get('local') and type_ == 'xcode':
            detector = CompilerDetector()
            detector.detect(self.params['params']['c_compiler'], self.params['params']['cxx_compiler'])
            emit('LOCAL_XCODE_TOOLS', 'yes')
            emit('XCODE', 'yes')
            emit('ACTOOL_PATH', self.params['params']['actool'])
            emit('IBTOOL_PATH', self.params['params']['ibtool'])
            self._configure_runtime_versions()
        elif type_ == 'system_cxx':
            c_compiler = self.params['params'].get('c_compiler')
            cxx_compiler = self.params['params'].get('cxx_compiler')
            if is_positive('USE_CLANG_CL'):
                c_compiler = 'clang-cl.exe' if c_compiler == 'cl.exe' else c_compiler
                cxx_compiler = 'clang-cl.exe' if cxx_compiler == 'cl.exe' else cxx_compiler
            detector = CompilerDetector()
            detector.detect(c_compiler, cxx_compiler)
            type_ = detector.type
        else:
            detector = None

        if type_ == 'msvc':
            return MSVCToolchainOptions(self, detector)
        else:
            return GnuToolchainOptions(self, detector)

    def _print_other_settings(self, compiler):
        host = self.host

        emit('USE_LOCAL_TOOLS', 'no' if self.ignore_local_files else 'yes')

        ragel = Ragel()
        ragel.configure_toolchain(self, compiler)
        ragel.print_variables()

        swiftc = SwiftCompiler(self)
        swiftc.configure()
        swiftc.print_compiler()

        if host.is_linux or host.is_macos or host.is_cygwin:
            if is_negative('USE_ARCADIA_PYTHON'):
                python = Python(self.tc)
                python.configure_posix()
                python.print_variables()

        cuda = Cuda(self)
        cuda.print_()
        CuDNN(cuda).print_()

        if self.ignore_local_files or host.is_windows or is_positive('NO_SVN_DEPENDS'):
            emit_with_ignore_comment('SVN_DEPENDS_CACHE__NO_UID__')
        else:
            emit_with_ignore_comment('SVN_DEPENDS_CACHE__NO_UID__', '${hide;kv:"disable_cache"}')

    @staticmethod
    def _load_json_from_base64(base64str):
        """
        :rtype: dict[str, Any]
        """

        def un_unicode(o):
            if isinstance(o, six.text_type):
                return six.ensure_str(o)
            if isinstance(o, list):
                return [un_unicode(oo) for oo in o]
            if isinstance(o, dict):
                return {un_unicode(k): un_unicode(v) for k, v in six.iteritems(o)}
            return o

        return un_unicode(json.loads(base64.b64decode(base64str)))


class YMake(object):
    def __init__(self, arcadia):
        self.arcadia = arcadia

    def print_presets(self):
        presets = opts().presets
        if is_positive_str(presets.get('EXPORT_GRADLE', 'no')):
            print('@import "${CONF_ROOT}/conf/export_gradle.yes.conf"')
        else:
            print('@import "${CONF_ROOT}/conf/export_gradle.no.conf"')

        if presets.get('CLANG_COVERAGE', None) is None:
            print('@import "${CONF_ROOT}/conf/coverage_full_instrumentation.conf"')
        else:
            print('@import "${CONF_ROOT}/conf/coverage_selective_instrumentation.conf"')

        if presets:
            print('# Variables set from command line by -D options')
            for key in sorted(presets):
                emit(key, opts().presets[key])

    @staticmethod
    def _print_conf_content(path):
        with open(path, 'r') as fin:
            print(fin.read())

    def print_core_conf(self):
        print('@import "${CONF_ROOT}/ymake.core.conf"')

    def print_settings(self):
        pass


class System(object):
    def __init__(self, platform):
        """
        :type platform: Platform
        """
        self.platform = platform

    def print_windows_target_const(self):
        # TODO(somov): Remove this variables, use generic OS/arch variables in makelists.
        emit('WINDOWS', 'yes')
        emit('WIN32', 'yes')
        if self.platform.is_64_bit == 64:
            emit('WIN64', 'yes')

    def print_nix_target_const(self):
        emit('JAVA_INCLUDE', '-I{0}/include -I{0}/include/{1}'.format('/usr/lib/jvm/default-java', self.platform.os_compat))

        emit('UNIX', 'yes')
        emit('REALPRJNAME')
        emit('SONAME')

    def print_target_settings(self):
        emit('TARGET_PLATFORM', self.platform.os_compat)
        emit('CANONIZED_TARGET_PLATFORM', self.platform.canonized_platform)
        emit('HARDWARE_ARCH', '32' if self.platform.is_32_bit else '64')
        emit('HARDWARE_TYPE', self.platform.arch)

        for variable in self.platform.arch_variables:
            emit(variable, 'yes')

        for variable in self.platform.os_variables:
            emit(variable, 'yes')

        if self.platform.is_armv7:
            emit('ARM7_FLOAT_ABI', self.platform.armv7_float_abi)

        if self.platform.is_android:
            emit('ANDROID_API', str(self.platform.android_api))

        if self.platform.is_posix:
            self.print_nix_target_const()
        elif self.platform.is_windows:
            self.print_windows_target_const()

    def print_host_settings(self):
        emit('HOST_PLATFORM', self.platform.os_compat)
        emit('CANONIZED_HOST_PLATFORM', self.platform.canonized_platform)

        for variable in itertools.chain(self.platform.os_variables, self.platform.arch_variables):
            emit('HOST_{var}'.format(var=variable), 'yes')


class CompilerDetector(object):
    def __init__(self):
        self.type = None
        self.c_compiler = None
        self.cxx_compiler = None
        self.version_list = None

    @staticmethod
    def preprocess_source(compiler, source):
        # noinspection PyBroadException
        try:
            fd, path = tempfile.mkstemp(suffix='.cpp')
            try:
                with os.fdopen(fd, 'w') as output:
                    output.write(source)
                stdout, code = get_stdout_and_code([compiler, '-E', path])
            except Exception as e:
                logger.info("While writing: `%s`", e)
            finally:
                os.remove(path)
            return stdout, code

        except Exception as e:
            logger.debug('Preprocessing failed: %s', e)
            return None, None

    @staticmethod
    def get_compiler_vars(compiler, names):
        prefix = '____YA_VAR_'
        source = '\n'.join(['{prefix}{name}={name}\n'.format(prefix=prefix, name=n) for n in names])

        # Некоторые препроцессоры возвращают ненулевой код возврата. Поэтому его проверять нельзя.
        # Мы можем только удостовериться после разбора stdout, что в нём
        # присутствовала хотя бы одна подставленная переменная.
        # TODO(somov): Исследовать, можно ли проверять ограниченный набор кодов возврата.
        # TODO(v-korovin): Нормально прокидывать Exception-ы, оно и так упадёт
        stdout, _ = CompilerDetector.preprocess_source(compiler, source)

        if stdout is None:
            return None

        vars_ = {}
        for line in six.ensure_str(stdout).split('\n'):
            parts = line.split('=', 1)
            if len(parts) == 2 and parts[0].startswith(prefix):
                name, value = parts[0][len(prefix):], parts[1]
                if value == name:
                    continue  # Preprocessor variable was not substituted
                vars_[name] = value

        return vars_

    def detect(self, c_compiler=None, cxx_compiler=None):
        c_compiler = c_compiler or os.environ.get('CC')
        cxx_compiler = cxx_compiler or os.environ.get('CXX') or c_compiler
        c_compiler = c_compiler or cxx_compiler

        logger.debug('e=%s', os.environ)
        if c_compiler is None:
            raise ConfigureError('Custom compiler was requested but not specified')

        c_compiler_path = which(c_compiler)

        clang_vars = ['__clang_major__', '__clang_minor__', '__clang_patchlevel__']
        gcc_vars = ['__GNUC__', '__GNUC_MINOR__', '__GNUC_PATCHLEVEL__']
        msvc_vars = ['_MSC_VER']
        apple_var = '__apple_build_version__'

        compiler_vars = self.get_compiler_vars(c_compiler_path, clang_vars + [apple_var] + gcc_vars + msvc_vars)

        if not compiler_vars:
            raise ConfigureError('Could not determine custom compiler version: {}'.format(c_compiler))

        def version(version_names):
            def iter_version():
                for name in version_names:
                    yield int(compiler_vars[name])

            # noinspection PyBroadException
            try:
                return list(iter_version())
            except Exception:
                return None

        clang_version = version(clang_vars)
        apple_build = apple_var in compiler_vars
        # TODO(somov): Учитывать номера версий сборки Apple компилятора Clang.
        _ = apple_build
        gcc_version = version(gcc_vars)
        msvc_version = version(msvc_vars)

        if msvc_version:
            logger.debug('Detected MSVC version %s', msvc_version)
            self.type = 'msvc'
        elif clang_version:
            logger.debug('Detected Clang version %s', clang_version)
            self.type = 'clang'
        elif gcc_version:
            logger.debug('Detected GCC version %s', gcc_version)
            # TODO(somov): Переименовать в gcc.
            self.type = 'gnu'
        else:
            raise ConfigureError('Could not determine custom compiler type: {}'.format(c_compiler))

        self.version_list = clang_version or gcc_version or msvc_version

        self.c_compiler = c_compiler_path
        self.cxx_compiler = cxx_compiler and which(cxx_compiler) or c_compiler_path


class ToolchainOptions(object):
    def __init__(self, build, detector):
        """
        :type build: Build
        """
        self.host = build.host
        self.target = build.target

        tc_json = build.params

        logger.debug('Toolchain host %s', self.host)
        logger.debug('Toolchain target %s', self.target)
        logger.debug('Toolchain json %s', DebugString(lambda: json.dumps(tc_json, indent=4, sort_keys=True)))

        self.params = tc_json['params']
        self._name = tc_json.get('name', 'theyknow')

        if detector:
            self.type = detector.type
            self.from_arcadia = False

            self.c_compiler = detector.c_compiler
            self.cxx_compiler = detector.cxx_compiler
            self.compiler_version_list = detector.version_list
            self.compiler_version = '.'.join(map(lambda part: six.ensure_str(str(part)), self.compiler_version_list))

        else:
            self.type = self.params['type']
            self.from_arcadia = True

            self.c_compiler = self.params['c_compiler']
            self.cxx_compiler = self.params['cxx_compiler']

            # TODO(somov): Требовать номер версии всегда.
            self.compiler_version = self.params.get('gcc_version') or self.params.get('version') or '0'
            self.compiler_version_list = list(map(int, self.compiler_version.split('.')))

        # 'match_root' at this point contains real name for references via toolchain
        self.name_marker = '$(%s)' % self.params.get('match_root', self._name.upper())

        self.arch_opt = self.params.get('arch_opt', [])
        self.triplet_opt = self.params.get('triplet_opt', {})
        self.target_opt = self.params.get('target_opt', [])

        # TODO(somov): Убрать чтение настройки из os.environ.
        self.werror_mode = preset('WERROR_MODE') or os.environ.get('WERROR_MODE') or self.params.get('werror_mode') or 'compiler_specific'

        # default C++ standard is set here, some older toolchains might need to redefine it in ya.conf.json
        self.cxx_std = self.params.get('cxx_std', 'c++20')

        self._env = tc_json.get('env', {})

        self.android_ndk_version = self.params.get('android_ndk_version', None)

        logger.debug('c_compiler=%s', self.c_compiler)
        logger.debug('cxx_compiler=%s', self.cxx_compiler)

        self.compiler_platform_projects = self.target.find_in_dict(self.params.get('platform'), [])

    def version_at_least(self, *args):
        return args <= tuple(self.compiler_version_list)

    def version_exactly(self, *args):
        if not args or len(args) > len(self.compiler_version_list):
            return False
        for left, right in zip(args, list(self.compiler_version_list)[:len(args)]):
            if left != right:
                return False
        return True

    @property
    def is_gcc(self):
        return self.type == 'gnu'

    @property
    def is_clang(self):
        return self.type in ('clang', 'xcode')

    @property
    def is_xcode(self):
        return self.type == 'xcode'

    @property
    def is_from_arcadia(self):
        return self.from_arcadia

    @property
    def is_system_cxx(self):
        return self._name == "system_cxx"

    def get_env(self, convert_list=None):
        convert_list = convert_list or (lambda x: x)
        r = {}
        for k, v in six.iteritems(self._env):
            if isinstance(v, str):
                r[k] = v
            elif isinstance(v, list):
                r[k] = convert_list(v)
            else:
                logger.debug('Unexpected values in environment: %s', self._env)
                raise ConfigureError('Internal error')
        return r


class GnuToolchainOptions(ToolchainOptions):
    def __init__(self, build, detector):
        super(GnuToolchainOptions, self).__init__(build, detector)

        self.ar = self.params.get('ar')
        self.ar_plugin = self.params.get('ar_plugin')
        self.strip = self.params.get('strip')
        self.objcopy = self.params.get('objcopy')
        self.objdump = self.params.get('objdump')
        self.isystem = self.params.get('isystem')

        self.dwarf_tool = self.target.find_in_dict(self.params.get('dwarf_tool'))

        # TODO(somov): Унифицировать формат sys_lib
        self.sys_lib = self.params.get('sys_lib', {})
        if isinstance(self.sys_lib, dict):
            self.sys_lib = self.target.find_in_dict(self.sys_lib, [])

        self.os_sdk = preset('OS_SDK') or self._default_os_sdk()

        self.os_sdk_local = False

        if build.host.is_apple and build.target.is_apple and to_bool(preset('APPLE_SDK_LOCAL'), default=False):
            self.os_sdk_local = True

        if build.host.is_apple and build.target.is_ios and to_bool(preset('MAPSMOBI_BUILD_TARGET'), default=False):
            self.os_sdk_local = True

        if self.os_sdk == 'local':
            self.os_sdk_local = True

    def _default_os_sdk(self):
        if self.target.is_linux:
            if self.target.is_armv8:
                return 'ubuntu-16'

            if self.target.is_armv7 and self.target.armv7_float_abi == 'hard':
                return 'ubuntu-16'

            if self.target.is_armv7 and self.target.armv7_float_abi == 'softfp':
                return 'ubuntu-18'

            # Default OS SDK for Linux builds
            return LINUX_SDK_DEFAULT


class Toolchain(object):
    def __init__(self, tc, build):
        """
        :type tc: ToolchainOptions
        :type build: Build
        """
        self.tc = tc
        self.build = build
        self.platform_projects = self.tc.compiler_platform_projects

    def print_toolchain(self):
        if self.platform_projects:
            emit('COMPILER_PLATFORM', list(unique(self.platform_projects)))


class Compiler(object):
    def __init__(self, tc, compiler_variable):
        self.compiler_variable = compiler_variable
        self.tc = tc

    def print_compiler(self):
        # CLANG and CLANG_VER variables
        emit(self.compiler_variable, 'yes')
        cv = self.tc.compiler_version
        if '.' in cv:
            cv = cv[:cv.index('.')]
        emit('{}_VER'.format(self.compiler_variable), cv)
        if self.tc.is_xcode:
            emit('XCODE', 'yes')


class GnuToolchain(Toolchain):
    def __init__(self, tc, build):
        """
        :type tc: GnuToolchainOptions
        :type build: Build
        """

        def get_os_sdk(target):
            sdk_native_version = 10.11 if not preset('EXPERIMENTAL_MACOS_M1_SUPPORT') else '11.1'
            if target.is_macos:
                return '$MACOS_SDK_RESOURCE_GLOBAL/MacOSX{}.sdk'.format(sdk_native_version)
            elif target.is_yocto:
                return '$YOCTO_SDK_RESOURCE_GLOBAL'
            return '$OS_SDK_ROOT_RESOURCE_GLOBAL'

        super(GnuToolchain, self).__init__(tc, build)
        self.tc = tc

        host = build.host
        target = build.target

        self.c_flags_platform = list(tc.target_opt)

        self.default_os_sdk_root = get_os_sdk(target)

        self.env = self.tc.get_env()

        self.env_go = {}
        if self.tc.is_clang and not self.tc.is_system_cxx:
            self.env_go = {'PATH': ['{}/bin'.format(self.tc.name_marker)]}
        if self.tc.is_gcc:
            self.env_go = {'PATH': ['{}/gcc/bin'.format(self.tc.name_marker)]}
        if 'PATH' in self.env_go:
            if target.is_linux:
                self.env_go['PATH'].append('$OS_SDK_ROOT_RESOURCE_GLOBAL/usr/bin')
            elif target.is_macos:
                self.env_go['PATH'].extend([
                    '$MACOS_SDK_RESOURCE_GLOBAL/usr/bin',
                    '$GO_FAKE_XCRUN_RESOURCE_GLOBAL',
                ])

        self.swift_flags_platform = []
        self.swift_lib_path = None

        if self.tc.is_from_arcadia:
            for lib_path in build.host.library_path_variables:
                self.env.setdefault(lib_path, []).append('{}/lib'.format(self.tc.name_marker))

        swift_target = select(default=None, selectors=[
            (target.is_iossim and target.is_x86_64, 'x86_64-apple-ios{}-simulator'.format(IOS_VERSION_MIN)),
            (target.is_iossim and target.is_x86, 'i386-apple-ios{}-simulator'.format(IOS_VERSION_MIN)),
            (target.is_iossim and target.is_armv8, 'arm64-apple-ios{}-simulator'.format(IOS_VERSION_MIN)),
            (not target.is_iossim and target.is_ios and target.is_armv8, 'arm64-apple-ios9'),
            (not target.is_iossim and target.is_ios and target.is_armv7, 'armv7-apple-ios9'),
        ])
        if swift_target:
            self.swift_flags_platform += ['-target', swift_target]

        if self.tc.is_from_arcadia:
            self.swift_lib_path = select(default=None, selectors=[
                (host.is_macos and target.is_iossim, '$SWIFT_XCODE_TOOLCHAIN_ROOT_RESOURCE_GLOBAL/usr/lib/swift/iphonesimulator'),
                (host.is_macos and not target.is_iossim and target.is_ios and (target.is_armv8 or target.is_armv7), '$SWIFT_XCODE_TOOLCHAIN_ROOT_RESOURCE_GLOBAL/usr/lib/swift/iphoneos'),
            ])

        if self.tc.is_clang:
            target_triple = self.tc.triplet_opt.get(target.arch, None)
            if not target_triple:
                target_triple = select(default=None, selectors=[
                    (target.is_linux and target.is_x86_64, 'x86_64-linux-gnu'),
                    (target.is_linux and target.is_armv8, 'aarch64-linux-gnu'),
                    (target.is_linux and target.is_armv7 and target.armv7_float_abi == 'hard', 'armv7-linux-gnueabihf'),
                    (target.is_linux and target.is_armv7 and target.armv7_float_abi == 'softfp', 'armv7-linux-gnueabi'),
                    (target.is_linux and target.is_powerpc, 'powerpc64le-linux-gnu'),

                    (target.is_iossim and target.is_x86_64, 'x86_64-apple-ios{}-simulator'.format(IOS_VERSION_MIN)),
                    (target.is_iossim and target.is_x86, 'i386-apple-ios{}-simulator'.format(IOS_VERSION_MIN)),
                    (target.is_iossim and target.is_armv8, 'arm64-apple-ios{}-simulator'.format(IOS_VERSION_MIN)),
                    (not target.is_iossim and target.is_ios and target.is_armv8, 'arm64-apple-ios{}'.format(IOS_VERSION_MIN)),
                    (not target.is_iossim and target.is_ios and target.is_armv7, 'armv7-apple-ios{}'.format(IOS_VERSION_MIN)),

                    (target.is_apple and target.is_x86, 'i386-apple-darwin14'),
                    (target.is_apple and target.is_x86_64, 'x86_64-apple-darwin14'),
                    (target.is_apple and target.is_macos_arm64, 'arm64-apple-macos11'),
                    (target.is_apple and target.is_armv7, 'armv7-apple-darwin14'),
                    (target.is_apple and target.is_armv8, 'arm64-apple-darwin14'),

                    (target.is_yocto and target.is_armv7, 'arm-poky-linux-gnueabi'),

                    (target.is_android and target.is_x86, 'i686-linux-android'),
                    (target.is_android and target.is_x86_64, 'x86_64-linux-android'),
                    (target.is_android and target.is_armv7, 'armv7a-linux-androideabi'),
                    (target.is_android and target.is_armv8, 'aarch64-linux-android'),

                    (target.is_emscripten and target.is_wasm64, 'wasm64-unknown-emscripten'),
                ])

            if target.is_android:
                # Android NDK allows specification of API level in target triple, e.g.:
                # armv7a-linux-androideabi16, aarch64-linux-android21
                target_triple += str(target.android_api)

            if target_triple:
                self.c_flags_platform.append('--target={}'.format(target_triple))

        if self.tc.isystem:
            for root in list(self.tc.isystem):
                self.c_flags_platform.extend(['-isystem', root])

        if target.is_android:
            self.c_flags_platform.extend(['-isystem', '{}/sources/cxx-stl/llvm-libc++abi/include'.format(self.tc.name_marker)])

        if target.is_cortex_a9:
            self.c_flags_platform.append('-mcpu=cortex-a9')

        if target.is_cortex_a35:
            self.c_flags_platform.append('-mcpu=cortex-a35')

        elif target.is_cortex_a53:
            self.c_flags_platform.append('-mcpu=cortex-a53')

        elif target.is_cortex_m4:
            self.c_flags_platform.append('-mcpu=cortex-m4 -mfpu=fpv4-sp-d16')

        elif target.is_cortex_m7:
            self.c_flags_platform.append('-mcpu=cortex-m7 -mfpu=fpv5-sp-d16')

        elif target.is_cortex_m23:
            self.c_flags_platform.append('-mcpu=cortex-m23')

        elif target.is_cortex_m33:
            self.c_flags_platform.append('-mcpu=cortex-m33 -mfpu=fpv5-sp-d16')

        elif target.is_armv7_neon:
            self.c_flags_platform.append('-mfpu=neon')

        elif target.is_arm968e_s:
            self.c_flags_platform.append('-march=armv5te -mcpu=arm968e-s -mthumb-interwork -mlittle-endian')

        if (target.is_armv7 or target.is_armv8m or target.is_armv7em or target.is_armv5te) and build.is_size_optimized:
            # Enable ARM Thumb2 variable-length instruction encoding
            # to reduce code size
            self.c_flags_platform.append('-mthumb')

        if target.is_arm or target.is_powerpc:
            # On linux, ARM and PPC default to unsigned char
            # However, Arcadia requires char to be signed
            self.c_flags_platform.append('-fsigned-char')

        if target.is_rv32imc:
            self.c_flags_platform.append('-march=rv32imc')

        if self.tc.is_clang or self.tc.is_gcc and self.tc.version_at_least(8, 2):
            target_flags = select(default=[], selectors=[
                (target.is_linux and target.is_power8le, ['-mcpu=power8', '-mtune=power8', '-maltivec']),
                (target.is_linux and target.is_power9le, ['-mcpu=power9', '-mtune=power9', '-maltivec']),
                (target.is_linux and target.is_armv8, ['-march=armv8a']),
                (target.is_macos, ['-mmacosx-version-min={}'.format(MACOS_VERSION_MIN)]),
                (target.is_ios and not target.is_iossim, ['-mios-version-min={}'.format(IOS_VERSION_MIN)]),
                (target.is_iossim, ['-mios-simulator-version-min={}'.format(IOS_VERSION_MIN)]),
                (target.is_android and target.is_armv7, ['-march=armv7-a', '-mfloat-abi=softfp']),
                (target.is_android and target.is_armv8, ['-march=armv8-a']),
                (target.is_yocto and target.is_armv7, ['-march=armv7-a', '-mfpu=neon', '-mfloat-abi=hard', '-mcpu=cortex-a9', '-O1'])
            ])

            if target_flags:
                self.c_flags_platform.extend(target_flags)

            if target.is_ios:
                self.c_flags_platform.append('-D__IOS__=1')

            if target.is_apple:
                self.setup_apple_sdk(target)

            if self.tc.is_from_arcadia or self.tc.is_system_cxx:
                if target.is_linux:
                    if not tc.os_sdk_local:
                        self.setup_sdk(project='build/platform/linux_sdk', var='$OS_SDK_ROOT_RESOURCE_GLOBAL')

                    if target.is_x86_64:
                        if host.is_linux and not self.tc.is_gcc:
                            self.setup_tools(project='build/platform/linux_sdk', var='$OS_SDK_ROOT_RESOURCE_GLOBAL', bin='usr/bin', ldlibs='usr/lib/x86_64-linux-gnu')
                        elif host.is_macos:
                            self.setup_tools(project='build/platform/binutils', var='$BINUTILS_ROOT_RESOURCE_GLOBAL', bin='x86_64-linux-gnu/bin', ldlibs=None)
                    elif target.is_powerpc:
                        self.setup_tools(project='build/platform/linux_sdk', var='$OS_SDK_ROOT_RESOURCE_GLOBAL', bin='usr/bin', ldlibs='usr/x86_64-linux-gnu/powerpc64le-linux-gnu/lib')
                    elif target.is_armv8:
                        self.setup_tools(project='build/platform/linux_sdk', var='$OS_SDK_ROOT_RESOURCE_GLOBAL', bin='usr/bin', ldlibs='usr/lib/x86_64-linux-gnu')

                if target.is_yocto:
                    self.setup_sdk(project='build/platform/yocto_sdk/yocto_sdk', var='${YOCTO_SDK_ROOT_RESOURCE_GLOBAL}')

    def setup_apple_sdk(self, target):
        if not self.tc.os_sdk_local:
            self.setup_apple_arcadia_sdk(target)
        else:
            self.setup_apple_local_sdk(target)

    def setup_apple_arcadia_sdk(self, target):
        if target.is_ios:
            self.setup_xcode_sdk(project='build/internal/platform/ios_sdk', var='${IOS_SDK_ROOT_RESOURCE_GLOBAL}')
            self.platform_projects.append('build/internal/platform/macos_system_stl')
        if target.is_macos:
            self.setup_xcode_sdk(project='build/internal/platform/macos_sdk', var='${MACOS_SDK_RESOURCE_GLOBAL}')
            self.platform_projects.append('build/internal/platform/macos_system_stl')

    def setup_apple_local_sdk(self, target):
        def get_output(*args):
            return six.ensure_str(subprocess.check_output(tuple(args))).strip()

        def get_sdk_root(sdk):
            root = self.env.get('SDKROOT')
            if root not in (None, '', ['']):
                return root

            root = os.environ.get('SDKROOT')
            if root:
                return root

            return get_output('xcrun', '-sdk', sdk, '--show-sdk-path')

        if target.is_iossim:
            self.env['SDKROOT'] = get_sdk_root('iphonesimulator')
        elif target.is_ios:
            self.env['SDKROOT'] = get_sdk_root('iphoneos')
        elif target.is_macos:
            self.env['SDKROOT'] = get_sdk_root('macosx')

    def setup_sdk(self, project, var):
        self.platform_projects.append(project)
        self.c_flags_platform.append('--sysroot={}'.format(var))
        self.swift_flags_platform += ['-sdk', var]

    def setup_xcode_sdk(self, project, var):
        self.platform_projects.append(project)
        self.c_flags_platform.append('-isysroot')
        self.c_flags_platform.append(var)
        self.swift_flags_platform += ['-sdk', var]

    # noinspection PyShadowingBuiltins
    def setup_tools(self, project, var, bin, ldlibs):
        self.platform_projects.append(project)
        self.c_flags_platform.append('-B{}/{}'.format(var, bin))
        if ldlibs:
            for lib_path in self.build.host.library_path_variables:
                self.env.setdefault(lib_path, []).append('{}/{}'.format(var, ldlibs))

    def print_toolchain(self):
        super(GnuToolchain, self).print_toolchain()

        emit('TOOLCHAIN_ENV', format_env(self.env, list_separator=':'))
        emit('_GO_TOOLCHAIN_ENV_PATH', format_env(self.env_go, list_separator=':'))
        emit('C_FLAGS_PLATFORM', self.c_flags_platform)
        emit('SWIFT_FLAGS_PLATFORM', self.swift_flags_platform)
        emit('SWIFT_LD_FLAGS', '-L{}'.format(self.swift_lib_path) if self.swift_lib_path else '')

        emit('PERL_SDK', preset('OS_SDK') or self.tc.os_sdk)
        if preset('OS_SDK') is None:
            emit('OS_SDK', self.tc.os_sdk)
        emit('OS_SDK_ROOT', None if self.tc.os_sdk_local else self.default_os_sdk_root)


class GnuCompiler(Compiler):
    def __init__(self, tc, build):
        """
        :type tc: GnuToolchainOptions
        :type build: Build
        """
        compiler_variable = 'CLANG' if tc.is_clang else 'GCC'
        super(GnuCompiler, self).__init__(tc, compiler_variable)

        self.build = build
        self.host = self.build.host
        self.target = self.build.target
        self.tc = tc

        self.c_foptions = [
            # Enable C++ exceptions (and allow them to be throw through pure C code)
            '-fexceptions',
            # Enable standard-conforming behavior and generate duplicate symbol error in case of duplicated global constants.
            # See: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85678#c0
            '-fno-common',

            # Split all functions and data into separate sections for DCE and ICF linker passes
            '-ffunction-sections',
            '-fdata-sections'
        ]

        if self.tc.is_clang and self.target.is_linux:
            # Use .init_array instead of .ctors (default for old clang versions)
            # See: https://maskray.me/blog/2021-11-07-init-ctors-init-array
            self.c_foptions.append('-fuse-init-array')

        if self.target.is_xtensa:
            self.c_foptions.append('-mlongcalls')

        if self.tc.is_clang:
            self.c_foptions += [
                # Set up output colorization
                '-fcolor-diagnostics',
                # Enable aligned allocation
                '-faligned-allocation',
                '-fdebug-default-version=4',
            ]
        elif self.tc.is_gcc:
            if self.target.is_xtensa or self.target.is_tc32:
                # Xtensa and tc32 toolchains does not support this flag
                pass
            else:
                self.c_foptions += [
                    # Set up output colorization
                    '-fdiagnostics-color=always',
                    # It looks like there is no way to enable aligned allocation in gcc
                ]

        self.c_warnings = [
            # Enable default warnings subset
            '-Wall',
            '-Wextra',
        ]
        self.cxx_warnings = [
            # Issue a warning if certain overload is hidden due to inheritance
            '-Woverloaded-virtual',
        ]

        # Disable some warnings which will fail compilation at the time
        self.c_warnings += [
            '-Wno-parentheses',
        ]

        self.c_defines = ['${hide:CPP_FAKEID}']
        if self.target.is_android:
            self.c_defines.append('${hide:ANDROID_FAKEID}')

        self.c_defines.extend([
            '-DARCADIA_ROOT=${ARCADIA_ROOT}',
            '-DARCADIA_BUILD_ROOT=${ARCADIA_BUILD_ROOT}',
        ])

        self.c_defines.extend([
            '-D_THREAD_SAFE', '-D_PTHREADS', '-D_REENTRANT',
            '-D_LARGEFILE_SOURCE', '-D__STDC_CONSTANT_MACROS', '-D__STDC_FORMAT_MACROS',
        ])

        if not self.target.is_android:
            # There is no usable _FILE_OFFSET_BITS=64 support in Androids until API 21. And it's incomplete until at least API 24.
            # https://android.googlesource.com/platform/bionic/+/master/docs/32-bit-abi.md
            # Arcadia have API 16 for 32-bit Androids.
            self.c_defines.append('-D_FILE_OFFSET_BITS=64')

        if self.target.is_linux or self.target.is_android or self.target.is_cygwin or self.target.is_none:
            self.c_defines.append('-D_GNU_SOURCE')

        if self.tc.is_clang and self.target.is_linux and self.target.is_x86_64:
            self.c_defines.append('-D_YNDX_LIBUNWIND_ENABLE_EXCEPTION_BACKTRACE')

        self.c_flags = ['$CL_DEBUG_INFO', '$CL_DEBUG_INFO_DISABLE_CACHE__NO_UID__']
        self.c_flags += self.tc.arch_opt + ['-pipe']

        self.sfdl_flags = ['-E', '-C', '-x', 'c++']

        if self.target.is_x86:
            self.c_flags.append('-m32')
        if self.target.is_x86_64:
            self.c_flags.append('-m64')

        if self.target.is_wasm64:
            # WebAssembly-specific exception handling flags
            self.c_foptions += [
                '-fwasm-exceptions',
            ]

        self.debug_info_flags = ['-g']
        if self.target.is_linux:
            self.debug_info_flags.append('-ggnu-pubnames')

        self.cross_suffix = '' if is_positive('FORCE_NO_PIC') else '.pic'

        self.optimize = None

        self.configure_build_type()

        if self.tc.is_clang:
            self.sfdl_flags.append('-Qunused-arguments')

            self.c_warnings += [
                '-Wno-implicit-const-int-float-conversion',
                # For nvcc to accept the above.
                '-Wno-unknown-warning-option',
            ]

            self.cxx_warnings += [
                '-Wimport-preprocessor-directive-pedantic',
                '-Wno-ambiguous-reversed-operator',
                '-Wno-defaulted-function-deleted',
                '-Wno-deprecated-anon-enum-enum-conversion',
                '-Wno-deprecated-enum-enum-conversion',
                '-Wno-deprecated-enum-float-conversion',
                '-Wno-deprecated-volatile',
                '-Wno-pessimizing-move',
                '-Wno-return-std-move',
                '-Wno-undefined-var-template',
            ]

        elif self.tc.is_gcc:
            if self.target.is_xtensa:
                # Xtensa toolchain does not support this flags
                pass
            else:
                self.c_foptions.append('-fno-delete-null-pointer-checks')
                self.c_foptions.append('-fabi-version=8')

    def configure_build_type(self):
        if self.build.is_valgrind:
            self.c_defines.append('-DWITH_VALGRIND=1')

        if self.build.is_debug:
            self.c_foptions.append('$FSTACK')

        if self.build.is_fast_debug:
            self.c_flags.append('-Og')

        if self.build.is_release:
            self.c_flags.append('$OPTIMIZE')
            if self.build.is_size_optimized:
                # -Oz is clang's more size-aggressive version of -Os
                # For ARM specifically, clang -Oz is on par with gcc -Os:
                # https://github.com/android/ndk/issues/133#issuecomment-365763507
                if self.tc.is_clang:
                    self.optimize = '-Oz'
                else:
                    self.optimize = '-Os'

                # Generate sections with address significance tables for ICF linker pass
                if self.tc.is_clang:
                    self.c_foptions.extend(['-faddrsig'])
            else:
                self.optimize = '-O3'

        if self.build.with_ndebug:
            self.c_defines.append('-DNDEBUG')
        else:
            self.c_defines.append('-UNDEBUG')

        if self.build.profiler_type in (Profiler.Generic, Profiler.GProf):
            self.c_foptions.append('-fno-omit-frame-pointer')

        if self.build.profiler_type == Profiler.GProf:
            self.c_flags.append('-pg')

    def print_compiler(self):
        super(GnuCompiler, self).print_compiler()

        emit('C_COMPILER', '"{}"'.format(self.tc.c_compiler))
        emit('C_COMPILER_OLD_UNQUOTED', self.tc.c_compiler)
        emit('C_COMPILER_OLD', '${quo:C_COMPILER_OLD_UNQUOTED}')
        emit('OPTIMIZE', self.optimize)
        emit('WERROR_MODE', self.tc.werror_mode)
        emit('_C_FLAGS', self.c_flags)
        emit('_C_FOPTIONS', self.c_foptions)
        emit('_STD_CXX_VERSION', preset('USER_STD_CXX_VERSION') or self.tc.cxx_std)
        append('C_DEFINES', self.c_defines)
        append('C_WARNING_OPTS', self.c_warnings)
        append('CXX_WARNING_OPTS', self.cxx_warnings)
        emit('CXX_COMPILER', '"{}"'.format(self.tc.cxx_compiler))
        emit('CXX_COMPILER_OLD_UNQUOTED', format(self.tc.cxx_compiler))
        emit('CXX_COMPILER_OLD', '${quo:CXX_COMPILER_OLD_UNQUOTED}')
        # TODO(somov): Убрать чтение настройки из os.environ
        emit('USE_ARC_PROFILE', 'yes' if preset('USE_ARC_PROFILE') or os.environ.get('USE_ARC_PROFILE') else 'no')
        emit('DEBUG_INFO_FLAGS', self.debug_info_flags)

        if self.build.is_coverage:
            emit('_IS_COVERAGE', 'yes')

        if self.tc.is_clang and self.tc.version_at_least(9):
            emit('_HAS_TIME_TRACE', 'yes')

        print('@import "${CONF_ROOT}/conf/compilers/gnu_compiler.conf"')


class SwiftCompiler(object):
    def __init__(self, build):
        self.host = build.host
        self.compiler = None

    def configure(self):
        if self.host.is_macos:
            self.compiler = '$SWIFT_XCODE_TOOLCHAIN_ROOT_RESOURCE_GLOBAL/usr/bin/swiftc'

    def print_compiler(self):
        emit('SWIFT_COMPILER', self.compiler or '')


class Linker(object):
    BFD = 'bfd'
    LLD = 'lld'
    GOLD = 'gold'

    def __init__(self, tc, build):
        """
        :type tc: ToolchainOptions
        :type build: Build
        """
        self.tc = tc
        self.build = build
        self.type = self._get_default_linker_type()

    def _get_default_linker_type(self):
        if not self.tc.is_from_arcadia or is_positive('EXPORT_CMAKE'):
            # External (e.g. system) toolchain: disable linker selection logic
            return None

        if self.build.target.is_android:
            # Android toolchain is NDK, LLD works on all supported platforms
            return Linker.LLD

        elif self.build.target.is_linux or self.build.target.is_macos or self.build.target.is_ios or self.build.target.is_wasm:
            return Linker.LLD

        # There is no linker choice on Windows (link.exe)
        return None

    def print_linker(self):
        self._print_linker_selector()

    def _print_linker_selector(self):
        # if self.type is None then _DEFAULT_LINKER is set to empty string value
        emit('_DEFAULT_LINKER_ID', self.type)


class LD(Linker):
    def __init__(self, tc, build):
        """
        :type tc: GnuToolchainOptions
        :type build: Build
        """
        super(LD, self).__init__(tc, build)

        self.build = build
        self.host = self.build.host
        self.target = self.build.target
        self.tc = tc

        target = self.target

        self.ar = preset('AR') or self.tc.ar
        self.ar_plugin = self.tc.ar_plugin
        self.strip = self.tc.strip
        self.objcopy = self.tc.objcopy
        self.objdump = self.tc.objdump

        self.musl = Setting('MUSL', convert=to_bool)

        if self.ar is None:
            if self.tc.is_from_arcadia:
                if self.tc.is_clang:
                    self.ar = '{}/bin/llvm-ar'.format(self.tc.name_marker)
                if self.tc.is_gcc:
                    self.ar = '{}/gcc/bin/gcc-ar'.format(self.tc.name_marker)
            else:
                self.ar = 'ar'

        self.ar_type = 'GNU_AR'
        self.llvm_ar_format = 'None'

        if 'libtool' in self.ar:
            self.ar_type = 'LIBTOOL'
        elif 'llvm-ar' in self.ar:
            self.ar_type = 'LLVM_AR'
            if target.is_apple:
                self.llvm_ar_format = "darwin"
            else:
                self.llvm_ar_format = "gnu"

        self.ld_flags = []

        if self.musl.value:
            self.ld_flags.extend(['-Wl,--no-as-needed'])
        elif target.is_linux:
            self.ld_flags.extend(['-ldl', '-lrt', '-Wl,--no-as-needed'])
            if self.tc.is_gcc:
                self.ld_flags.extend(('-Wl,-Bstatic', '-latomic', '-Wl,-Bdynamic'))
        elif target.is_android:
            self.ld_flags.extend(['-ldl', '-Wl,--no-as-needed'])

        self.ld_sdk = select(default=None, selectors=[
            # -platform_version <platform> <min_version> <sdk_version>
            (target.is_macos, '-Wl,-platform_version,macos,{MACOS_VERSION_MIN},11.0'.format(MACOS_VERSION_MIN=MACOS_VERSION_MIN)),
            (not target.is_iossim and target.is_ios, '-Wl,-platform_version,ios,{IOS_VERSION_MIN},13.1'.format(IOS_VERSION_MIN=IOS_VERSION_MIN)),
            (target.is_iossim, '-Wl,-platform_version,ios-simulator,{IOS_VERSION_MIN},14.5'.format(IOS_VERSION_MIN=IOS_VERSION_MIN)),
        ])

        if self.build.profiler_type == Profiler.GProf:
            self.ld_flags.append('-pg')

        if self.ld_sdk:
            self.ld_flags.append(self.ld_sdk)

        self.sys_lib = self.tc.sys_lib

        if target.is_android:
            # Use toolchain defaults to link with libunwind/clang_rt.builtins
            self.use_stdlib = '-nostdlib++'

    def print_linker(self):
        super(LD, self).print_linker()

        emit('AR_TOOL', self.ar)
        emit('AR_TYPE', self.ar_type)
        emit('_LD_LLVM_AR_FORMAT', self.llvm_ar_format)
        emit('_LD_AR_PLUGIN', self.ar_plugin or 'None')

        emit('STRIP_TOOL_VENDOR', self.strip)
        emit('OBJCOPY_TOOL_VENDOR', self.objcopy)
        emit('OBJDUMP_TOOL_VENDOR', self.objdump)

        emit('_LD_FLAGS', self.ld_flags)
        emit('_LD_SYS_LIB', self.sys_lib)
        emit('LD_SDK_VERSION', self.ld_sdk)

        dwarf_tool = self.tc.dwarf_tool
        if dwarf_tool is None and self.tc.is_clang and (self.target.is_macos or self.target.is_ios):
            dsymutil = '{}/bin/{}dsymutil'.format(self.tc.name_marker, '' if self.tc.version_at_least(7) else 'llvm-')
            dwarf_tool = '${YMAKE_PYTHON} ${input:"build/scripts/run_llvm_dsymutil.py"} ' + dsymutil
            if self.tc.version_at_least(5, 0):
                dwarf_tool += ' -flat'

        if dwarf_tool is not None:
            emit('DWARF_TOOL', dwarf_tool)

        arch_flag = '--arch={arch}'.format(arch=self.target.os_compat)
        emit('_LD_ARCH_FLAG', arch_flag)

        print('@import "${CONF_ROOT}/conf/linkers/ld.conf"')


class MSVCToolchainOptions(ToolchainOptions):
    def __init__(self, build, detector):
        super(MSVCToolchainOptions, self).__init__(build, detector)

        # C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Tools\MSVC\14.14.26428
        self.vc_root = None

        # C:\Program Files (x86)\Windows Kits\10\Include\10.0.14393.0
        self.kit_includes = None

        # C:\Program Files (x86)\Windows Kits\10\Lib\10.0.14393.0
        self.kit_libs = None

        self.under_wine_compiler = self.params.get('wine', False)
        self.under_wine_tools = not build.host.is_windows
        self.under_wine_link = self.under_wine_tools
        self.under_wine_lib = self.under_wine_tools
        self.system_msvc = self.params.get('system_msvc', False)
        self.ide_msvs = self.params.get('ide_msvs', False)
        self.use_clang = self.params.get('use_clang', False)
        self.use_msvc_linker = is_positive('USE_MSVC_LINKER')
        self.use_arcadia_toolchain = self.params.get('use_arcadia_toolchain', False)

        self.sdk_version = None

        if self.ide_msvs:
            bindir = '$(VC_ExecutablePath_x64_x64)\\'
            self.c_compiler = bindir + 'cl.exe'
            self.cxx_compiler = self.c_compiler

            self.link = bindir + 'link.exe'
            self.lib = bindir + 'lib.exe'
            self.masm_compiler = bindir + 'ml64.exe'

            self.vc_root = None

            sdk_dir = '$(WindowsSdkDir)'
            self.sdk_version = '$(WindowsTargetPlatformVersion)'
            self.kit_includes = win_path_fix(os.path.join(sdk_dir, 'Include', self.sdk_version))
            self.kit_libs = win_path_fix(os.path.join(sdk_dir, 'Lib', self.sdk_version))

        elif detector:
            self.use_clang = is_positive('USE_CLANG_CL')

            self.masm_compiler = which('ml64.exe')
            self.link = which('link.exe')
            self.lib = which('lib.exe')

            sdk_dir = os.environ.get('WindowsSdkDir')
            self.sdk_version = os.environ.get('WindowsSDKVersion').replace('\\', '')
            vc_install_dir = os.environ.get('VCToolsInstallDir')

            if any([x is None for x in (sdk_dir, self.sdk_version, vc_install_dir)]):
                raise ConfigureError('No %WindowsSdkDir%, %WindowsSDKVersion% or %VCINSTALLDIR% present. Please, run vcvars64.bat to setup preferred environment.')

            self.vc_root = os.path.normpath(vc_install_dir)
            self.kit_includes = win_path_fix(os.path.normpath(os.path.join(sdk_dir, 'Include', self.sdk_version)))
            self.kit_libs = win_path_fix(os.path.normpath(os.path.join(sdk_dir, 'Lib', self.sdk_version)))

            # TODO(somov): Определять автоматически self.version в этом случае

        else:
            if self.version_at_least(2019):
                self.sdk_version = '10.0.18362.0'
                if is_positive('MSVC20'):  # XXX: temporary flag, remove after DTCC-123 is completed
                    self.cxx_std = 'c++latest'
            else:
                self.sdk_version = '10.0.16299.0'
            sdk_dir = '$WINDOWS_KITS_RESOURCE_GLOBAL'

            self.vc_root = self.name_marker if not self.use_clang else '$MSVC_FOR_CLANG_RESOURCE_GLOBAL'
            self.kit_includes = win_path_fix(os.path.join(sdk_dir, 'Include', self.sdk_version))
            self.kit_libs = win_path_fix(os.path.join(sdk_dir, 'Lib', self.sdk_version))

            bindir = win_path_fix(os.path.join(self.vc_root, 'bin', 'Hostx64'))

            tools_name = select(selectors=[
                (build.target.is_x86, 'x86'),
                (build.target.is_x86_64, 'x64'),
                (build.target.is_armv7, 'arm'),
            ])

            asm_name = select(selectors=[
                (build.target.is_x86, 'ml.exe'),
                (build.target.is_x86_64, 'ml64.exe'),
                (build.target.is_armv7, 'armasm.exe'),
            ])

            self.masm_compiler = win_path_fix(os.path.join(bindir, tools_name, asm_name))

            if self.use_clang and not self.use_msvc_linker:
                self.link = self.host.exe(self.name_marker, "bin", "lld-link")
                self.under_wine_link = False
            else:
                self.link = win_path_fix(os.path.join(bindir, tools_name, 'link.exe'))
                self.under_wine_link = self.under_wine_tools

            if self.use_clang:
                self.lib = self.host.exe(self.name_marker, "bin", "llvm-lib")
                self.under_wine_lib = False
            else:
                self.lib = win_path_fix(os.path.join(bindir, tools_name, 'lib.exe'))
                self.under_wine_lib = self.under_wine_tools

            logger.debug("link {}; lib {}".format(self.link, self.lib))


class MSVC(object):
    def __init__(self, tc, build):
        """
        :type tc: MSVCToolchainOptions
        :type build: Build
        """
        if not isinstance(tc, MSVCToolchainOptions):
            raise TypeError('Got {} ({}) instead of an MSVCToolchainOptions'.format(tc, type(tc)))

        self.build = build
        self.tc = tc


class MSVCToolchain(MSVC, Toolchain):
    def __init__(self, tc, build):
        """
        :type tc: MSVCToolchainOptions
        :param build: Build
        """
        Toolchain.__init__(self, tc, build)
        MSVC.__init__(self, tc, build)

        if self.tc.from_arcadia and not self.tc.ide_msvs:
            self.platform_projects.append('build/internal/platform/msvc')
            if tc.under_wine_compiler or tc.under_wine_tools:
                self.platform_projects.append('build/platform/wine')

    def print_toolchain(self):
        super(MSVCToolchain, self).print_toolchain()

        emit('TOOLCHAIN_ENV', format_env(self.tc.get_env(), list_separator=';'))

        if self.tc.sdk_version:
            emit('WINDOWS_KITS_VERSION', self.tc.sdk_version)

        if self.tc.under_wine_tools:
            emit('_UNDER_WINE_TOOLS', 'yes')
        if self.tc.under_wine_link:
            emit('_UNDER_WINE_LINK', 'yes')
        if self.tc.under_wine_lib:
            emit('_UNDER_WINE_LIB', 'yes')
        if self.tc.under_wine_compiler:
            emit('_UNDER_WINE_COMPILER', 'yes')
        if self.tc.use_clang:
            emit('CLANG_CL', 'yes')
        if self.tc.ide_msvs:
            emit('IDE_MSVS', 'yes')
        if self.tc.use_arcadia_toolchain:
            emit('USE_ARCADIA_TOOLCHAIN', 'yes')
        emit('_MSVC_TC_KIT_LIBS', self.tc.kit_libs)
        emit('_MSVC_TC_VC_ROOT', self.tc.vc_root)

        print('@import "${CONF_ROOT}/conf/toolchains/msvc_toolchain.conf"')


class MSVCCompiler(MSVC, Compiler):
    def __init__(self, tc, build):
        Compiler.__init__(self, tc, 'MSVC')
        MSVC.__init__(self, tc, build)

    def print_compiler(self):
        super(MSVCCompiler, self).print_compiler()

        target = self.build.target

        warns_enabled = [
            4018,  # 'expression' : signed/unsigned mismatch
            4265,  # 'class' : class has virtual functions, but destructor is not virtual
            4296,  # 'operator' : expression is always false
            4431,  # missing type specifier - int assumed
        ]
        warns_as_error = [
            4013,  # 'function' undefined; assuming extern returning int
        ]
        warns_disabled = [
            # While this warning corresponds to enabled-by-default -Wmacro-redefinition,
            # it floods clog with abundant amount of log lines,
            # as yvals_core.h from Windows SDK redefines certain
            # which macros logically belong to libcxx
            4005,  # '__cpp_lib_*': macro redefinition.

            # Ne need to recheck this, but it looks like _CRT_USE_BUILTIN_OFFSETOF still makes sense
            4117,  # macro name '_CRT_USE_BUILTIN_OFFSETOF' is reserved, '#define' ignored

            4127,  # conditional expression is constant
            4200,  # nonstandard extension used : zero-sized array in struct/union
            4201,  # nonstandard extension used : nameless struct/union
            4351,  # elements of array will be default initialized
            4355,  # 'this' : used in base member initializer list
            4503,  # decorated name length exceeded, name was truncated
            4510,  # default constructor could not be generated
            4511,  # copy constructor could not be generated
            4512,  # assignment operator could not be generated
            4554,  # check operator precedence for possible error; use parentheses to clarify precedence
            4610,  # 'object' can never be instantiated - user defined constructor required
            4706,  # assignment within conditional expression
            4800,  # forcing value to bool 'true' or 'false' (performance warning)
            4996,  # The POSIX name for this item is deprecated
            4714,  # function marked as __forceinline not inlined
            4197,  # 'TAtomic' : top-level volatile in cast is ignored
            4245,  # 'initializing' : conversion from 'int' to 'ui32', signed/unsigned mismatch
            4324,  # 'ystd::function<void (uint8_t *)>': structure was padded due to alignment specifier
            5033,  # 'register' is no longer a supported storage class
        ]

        defines = [
            '${hide:CPP_FAKEID}',
            # FIXME: This is quick fix to let catboost build from MSVS IDE
            # This place is questionable overall, see YMAKE-437
            '/DARCADIA_ROOT=' + ('${ARCADIA_ROOT}' if not self.tc.ide_msvs else '.'),
            '/DARCADIA_BUILD_ROOT=' + ('${ARCADIA_BUILD_ROOT}' if not self.tc.ide_msvs else '.'),
            '/DWIN32',
            '/D_WIN32',
            '/D_WINDOWS',
            # Define _CRT_*_NO_WARNINGS macros to prevent ucrt from issuing a warning whenever
            # a POSIX-style function is used instead of the alternative Microsoft suggests as a secure / standard replacement
            # (e. g. `strncpy()` instead of `strncpy_s()`, `access()` instead of `_access()`)
            # For details see:
            # https://docs.microsoft.com/en-us/cpp/c-runtime-library/security-features-in-the-crt
            '/D_CRT_SECURE_NO_WARNINGS',
            '/D_CRT_NONSTDC_NO_WARNINGS',
            # Math constants (such as M_PI, M_E, M_SQRT2) are not defined in standard C / C++
            # In order to get them defined by Windows ucrt library,
            # you must first define _USE_MATH_DEFINES before #including <cmath> or math.h>.
            # (NB: glibc defines these macros whenever _XOPEN_SOURCE is defined)
            '/D_USE_MATH_DEFINES',
            '/D__STDC_CONSTANT_MACROS',
            '/D__STDC_FORMAT_MACROS',
            '/D_USING_V110_SDK71_',
            # Below defines are covered at
            # https://docs.microsoft.com/en-us/windows/win32/winprog/using-the-windows-headers#faster-builds-with-smaller-header-files
            # Exclude APIs such as Cryptography, DDE, RPC, Shell, and Windows Sockets (while including <windows.h>)
            '/DWIN32_LEAN_AND_MEAN',
            # Define NOMINMAX to avoid min() and max() macros definition (while including <windows.h>)
            '/DNOMINMAX',
        ]

        cxx_defines = [
            # Use builtin offsetof implementation
            # instead of a crutcy macro defined in ucrt/stddef.h.
            # The latter can not be used in constexpr statements.
            '/D_CRT_USE_BUILTIN_OFFSETOF',
        ]

        if target.is_x86_64:
            defines.extend(('/D_WIN64', '/DWIN64'))

        if target.is_armv7:
            defines.extend(('/D_ARM_WINAPI_PARTITION_DESKTOP_SDK_AVAILABLE', '/D__arm__'))

        winapi_unicode = False

        flags = [
            '/nologo', '/Zm500', '/GR', '/bigobj', '/FC', '/EHs', '/errorReport:prompt', '$MSVC_INLINE_FLAG', '/utf-8',
            # enable standard conforming mode
            '/permissive-'
        ]
        flags += self.tc.arch_opt

        c_warnings = ['/we{}'.format(code) for code in warns_as_error]
        c_warnings += ['/w1{}'.format(code) for code in warns_enabled]
        c_warnings += ['/wd{}'.format(code) for code in warns_disabled]
        cxx_warnings = []

        if self.tc.use_clang:
            if not self.tc.is_system_cxx:
                flags += [
                    # Allow <windows.h> to be included via <Windows.h> in case-sensitive file-systems.
                    '-fcase-insensitive-paths',
                ]
            flags += [
                # At the time clang-cl identifies itself as MSVC 19.11:
                # (actual value can be found in clang/lib/Driver/ToolChains/MSVC.cpp, the syntax would be like
                # ```
                # MSVT = VersionTuple(19, 11);
                # ```
                #
                # We override this value to match current value of the actual MSVC being used.
                '-fms-compatibility-version=19.21',
                # for msvc compatibility
                # https://clang.llvm.org/docs/UsersManual.html#microsoft-extensions
                '-fdelayed-template-parsing',
            ]
            if target.is_x86:
                flags.append('-m32')
            elif target.is_x86_64:
                flags.append('-m64')

            c_warnings.extend((
                '-Wno-format',
                '-Wno-parentheses',
                '-Wno-unknown-warning-option',
            ))

            cxx_warnings += [
                '-Wimport-preprocessor-directive-pedantic',
                '-Woverloaded-virtual',
                '-Wno-ambiguous-reversed-operator',
                '-Wno-defaulted-function-deleted',
                '-Wno-deprecated-anon-enum-enum-conversion',
                '-Wno-deprecated-enum-enum-conversion',
                '-Wno-deprecated-enum-float-conversion',
                '-Wno-deprecated-volatile',
                '-Wno-undefined-var-template',
            ]

            if self.tc.ide_msvs:
                cxx_warnings += [
                    '-Wno-unused-command-line-argument',
                ]

        defines.append('/D_WIN32_WINNT={0}'.format(WINDOWS_VERSION_MIN))

        if winapi_unicode:
            defines += ['/DUNICODE', '/D_UNICODE']
        else:
            defines += ['/D_MBCS']

        vc_include = win_path_fix(os.path.join(self.tc.vc_root, 'include')) if not self.tc.ide_msvs else "$(VC_VC_IncludePath.Split(';')[0].Replace('\\','/'))"

        if not self.tc.ide_msvs:
            def include_flag(path):
                return '{flag}"{path}"'.format(path=path, flag='/I ' if not self.tc.use_clang else '-imsvc')

            for name in ('shared', 'ucrt', 'um', 'winrt'):
                flags.append(include_flag(win_path_fix(os.path.join(self.tc.kit_includes, name))))
            flags.append(include_flag(vc_include))

        if self.tc.use_clang:
            emit('CLANG_CL', 'yes')
        if self.tc.ide_msvs:
            emit('IDE_MSVS', 'yes')
        if self.tc.use_arcadia_toolchain:
            emit('USE_ARCADIA_TOOLCHAIN', 'yes')

        emit('CXX_COMPILER_UNQUOTED', '"{}"'.format(self.tc.cxx_compiler))
        emit('CXX_COMPILER_OLD_UNQUOTED', self.tc.cxx_compiler)
        emit('C_COMPILER_UNQUOTED', '"{}"'.format(self.tc.c_compiler))
        emit('C_COMPILER_OLD_UNQUOTED', self.tc.c_compiler)
        emit('MASM_COMPILER_UNQUOTED', '"{}"'.format(self.tc.masm_compiler))
        emit('MASM_COMPILER_OLD_UNQUOTED', self.tc.masm_compiler)
        append('C_DEFINES', defines)
        append('C_WARNING_OPTS', c_warnings)
        emit('_CXX_DEFINES', cxx_defines)
        append('CXX_WARNING_OPTS', cxx_warnings)

        if self.build.is_release:
            emit('CFLAGS_PER_TYPE', '$CFLAGS_RELEASE')
        if self.build.is_debug:
            emit('CFLAGS_PER_TYPE', '$CFLAGS_DEBUG')
        if self.build.is_ide:
            emit('CFLAGS_PER_TYPE', '@[debug|$CFLAGS_DEBUG]@[release|$CFLAGS_RELEASE]')

        emit('_STD_CXX_VERSION', preset('USER_STD_CXX_VERSION') or self.tc.cxx_std)

        emit('_MSVC_FLAGS', flags)

        ucrt_include = win_path_fix(os.path.join(self.tc.kit_includes, 'ucrt')) if not self.tc.ide_msvs else "$(UniversalCRT_IncludePath.Split(';')[0].Replace('\\','/'))"

        # clang-cl has '#include_next', and MSVC hasn't. It needs separately specified CRT and VC include directories for libc++ to include second in order standard C and C++ headers.
        if not self.tc.use_clang:
            emit('_CFLAGS_UCRT_VC_INCLUDES', '/DY_UCRT_INCLUDE="%s"' % ucrt_include, '/DY_MSVC_INCLUDE="%s"' % vc_include)
        else:
            emit('_CFLAGS_UCRT_VC_INCLUDES')

        emit('WERROR_MODE', self.tc.werror_mode)

        print('@import "${CONF_ROOT}/conf/compilers/msvc_compiler.conf"')


class MSVCLinker(MSVC, Linker):
    def __init__(self, tc, build):
        MSVC.__init__(self, tc, build)
        Linker.__init__(self, tc, build)

    def print_linker(self):
        super(MSVCLinker, self).print_linker()

        linker = self.tc.link
        linker_lib = self.tc.lib

        emit('_MSVC_LIB', '"{}"'.format(linker_lib))
        emit('_MSVC_LIB_OLD_UNQUOTED', linker_lib)
        emit('_MSVC_LIB_OLD', '${quo:_MSVC_LIB_OLD_UNQUOTED}')
        emit('_MSVC_LINK', '"{}"'.format(linker))
        emit('_MSVC_LINK_OLD_UNQUOTED', linker)
        emit('_MSVC_LINK_OLD', '${quo:_MSVC_LINK_OLD_UNQUOTED}')

        if self.build.is_release:
            emit('LINK_EXE_FLAGS_PER_TYPE', '$LINK_EXE_FLAGS_RELEASE')
        if self.build.is_debug:
            emit('LINK_EXE_FLAGS_PER_TYPE', '$LINK_EXE_FLAGS_DEBUG')
        if self.build.is_ide and self.tc.ide_msvs:
            emit('LINK_EXE_FLAGS_PER_TYPE', '@[debug|$LINK_EXE_FLAGS_DEBUG]@[release|$LINK_EXE_FLAGS_RELEASE]')

        print('@import "${CONF_ROOT}/conf/linkers/msvc_linker.conf"')


# TODO(somov): Rename!
Compilers = {
    'gnu': (GnuToolchain, GnuCompiler, LD),
    'clang': (GnuToolchain, GnuCompiler, LD),
    'xcode': (GnuToolchain, GnuCompiler, LD),
    'msvc': (MSVCToolchain, MSVCCompiler, MSVCLinker),
}


class Ragel(object):
    def __init__(self):
        self.rlgen_flags = []
        self.ragel_flags = []
        self.ragel6_flags = []

    def configure_toolchain(self, build, compiler):
        if isinstance(compiler, MSVCCompiler):
            self.set_default_flags(optimized=False)
        elif isinstance(compiler, GnuCompiler):
            self.set_default_flags(optimized=build.is_release and not build.is_sanitized)
        else:
            raise ConfigureError('Unexpected compiler {}'.format(compiler))

    def set_default_flags(self, optimized):
        if optimized:
            self.rlgen_flags.append('-G2')
            self.ragel6_flags.append('-CG2')
        else:
            self.rlgen_flags.append('-T0')
            self.ragel6_flags.append('-CT0')

    def print_variables(self):
        emit('RLGEN_FLAGS', self.rlgen_flags)
        emit('RAGEL_FLAGS', self.ragel_flags)
        emit('RAGEL6_FLAGS', self.ragel6_flags)


class Python(object):
    def __init__(self, tc):
        self.python = None
        self.flags = None
        self.ldflags = None
        self.libraries = None
        self.includes = None
        self.tc = tc

    def configure_posix(self, python=None, python_config=None):
        self.check_configuration()

        python = python or preset('PYTHON_BIN') or which('python')
        python_config = python_config or preset('PYTHON_CONFIG') or which('python-config')

        if python is None or python_config is None:
            return

        # python-config dumps each option on one line in the specified order
        config = get_stdout([python_config, '--cflags', '--ldflags', '--includes']) or ''
        config = config.split('\n')
        if len(config) < 3:
            return

        self.python = python
        self.flags = config[0]
        self.ldflags = config[1]
        self.includes = config[2]
        # Do not split libraries from ldflags.
        # They are not used separately and get overriden together, so it is safe.
        # TODO(somov): Удалить эту переменную и PYTHON_LIBRARIES из makelist-ов.
        self.libraries = ''

    def check_configuration(self):
        if preset('USE_ARCADIA_PYTHON') == 'no':

            # Set USE_LOCAL_PYTHON to enable configuration
            # when we still using fixed OS SDK,
            # but at the same time using Python from the local system.
            #
            # This configuration is not guaranteed to work,
            # for example, if local and fixed OS SDKs differ much.
            if preset('USE_LOCAL_PYTHON') == 'yes':
                return

            if not preset('USE_SYSTEM_PYTHON') and not self.tc.os_sdk_local:
                raise Exception("Use fixed python (see https://clubs.at.yandex-team.ru/arcadia/15392) or set OS_SDK=local flag")

    def print_variables(self):
        variables = Variables({
            'PYTHON_BIN': self.python,
            'PYTHON_FLAGS': self.flags,
            'PYTHON_LDFLAGS': self.ldflags,
            'PYTHON_LIBRARIES': self.libraries,
            'PYTHON_INCLUDE': self.includes
        })

        variables.update_from_presets()
        variables.reset_if_any(reset_value='PYTHON-NOT-FOUND')
        variables.emit()


class Setting(object):
    def __init__(self, key, auto=None, convert=None, rewrite=False):
        self.key = key

        self.auto = auto
        self.convert = convert

        self.preset = preset(key)
        self.from_user = self.preset is not None
        self.rewrite = rewrite

        self._value = Setting.no_value

    @property
    def value(self):
        if self._value is Setting.no_value:
            self._value = self.calculate_value()
        return self._value

    def calculate_value(self):
        if not self.from_user:
            return self.auto if not callable(self.auto) else self.auto()
        else:
            return self.preset if not self.convert else self.convert(self.preset)

    @value.setter
    def value(self, value):
        if self.from_user:
            raise ConfigureError("Variable {key} already set by user to {old}. Can not change it's value to {new}".format(key=self.key, old=self._value, new=value))
        self._value = value

    def emit(self):
        if not self.from_user or self.rewrite:
            emit(self.key, self.value)

    no_value = object()


class Cuda(object):
    def __init__(self, build):
        """
        :type build: Build
        """
        self.build = build

        self.have_cuda = Setting('HAVE_CUDA', auto=self.auto_have_cuda, convert=to_bool)

        self.cuda_root = Setting('CUDA_ROOT')
        self.cuda_version = Setting('CUDA_VERSION', auto=self.auto_cuda_version, convert=self.convert_major_version, rewrite=True)
        self.cuda_architectures = Setting('CUDA_ARCHITECTURES', auto=self.auto_cuda_architectures, rewrite=True)
        self.use_arcadia_cuda = Setting('USE_ARCADIA_CUDA', auto=self.auto_use_arcadia_cuda, convert=to_bool)
        self.use_arcadia_cuda_host_compiler = Setting('USE_ARCADIA_CUDA_HOST_COMPILER', auto=self.auto_use_arcadia_cuda_host_compiler, convert=to_bool)
        self.cuda_use_clang = Setting('CUDA_USE_CLANG', auto=False, convert=to_bool)
        self.cuda_host_compiler = Setting('CUDA_HOST_COMPILER', auto=self.auto_cuda_host_compiler)
        self.cuda_host_compiler_env = Setting('CUDA_HOST_COMPILER_ENV')
        self.cuda_host_msvc_version = Setting('CUDA_HOST_MSVC_VERSION')
        self.cuda_nvcc_flags = Setting('CUDA_NVCC_FLAGS', auto=[])

        self.peerdirs = ['build/platform/cuda']

        self.nvcc_flags = [
            # Compress fatbinary to reduce size of .nv_fatbin and prevent problems with linking
            #
            # Idea comes from many resources, one of them is https://discourse.llvm.org/t/lld-relocation-overflows-and-nv-fatbin/58889/6
            # Some sources suggest using `-Xfatbin=-compress-all`, other suggest using `-Xcuda-fatbinary --compress-all`
            # We will use the same flag as in nixpkgs
            # (https://github.com/NixOS/nixpkgs/pull/220402/files#diff-a38e6c4e8421c03dc6c2a60c9a172ceb4059048b65798e5d4a400a7a4a5720ffR167)
            "-Xfatbin=-compress-all",
            # Allow __host__, __device__ annotations in lambda declaration.
            "--expt-extended-lambda",
            # Allow host code to invoke __device__ constexpr functions and vice versa
            "--expt-relaxed-constexpr",
            # Allow to use newer compilers than CUDA Toolkit officially supports
            "--allow-unsupported-compiler",
        ]

        if not self.have_cuda.value:
            return

        if self.cuda_host_compiler.value:
            self.nvcc_flags.append('--compiler-bindir=$CUDA_HOST_COMPILER')

        if self.use_arcadia_cuda.value:
            self.cuda_root.value = '$CUDA_RESOURCE_GLOBAL'

            if self.build.target.is_linux_x86_64 and self.build.tc.is_clang:
                # TODO(somov): Эта настройка должна приезжать сюда автоматически из другого места
                self.nvcc_flags.append('-I$OS_SDK_ROOT/usr/include/x86_64-linux-gnu')

    def print_(self):
        self.print_variables()
        self.print_macros()
        print('@import "${CONF_ROOT}/conf/compilers/nvcc.conf"')

    def print_variables(self):
        self.have_cuda.emit()
        if not self.have_cuda.value:
            return

        if self.use_arcadia_cuda.value and self.cuda_host_compiler.value is None:
            logger.warning('$USE_ARCADIA_CUDA is set, but no $CUDA_HOST_COMPILER')

        self.setup_vc_root()

        self.cuda_root.emit()
        self.cuda_version.emit()
        self.cuda_architectures.emit()
        self.use_arcadia_cuda.emit()
        self.use_arcadia_cuda_host_compiler.emit()
        self.cuda_use_clang.emit()
        self.cuda_host_compiler.emit()
        self.cuda_host_compiler_env.emit()
        self.cuda_host_msvc_version.emit()
        self.cuda_nvcc_flags.emit()

        emit('NVCC', '"{}"'.format(self.build.host.exe('$CUDA_ROOT', 'bin', 'nvcc')))
        emit('NVCC_OLD_UNQUOTED', self.build.host.exe('$CUDA_ROOT', 'bin', 'nvcc'))
        emit('NVCC_OLD', '${quo:NVCC_OLD_UNQUOTED}')
        emit('NVCC_FLAGS', self.nvcc_flags, '$CUDA_NVCC_FLAGS')
        emit('NVCC_OBJ_EXT', '.o' if not self.build.target.is_windows else '.obj')

    def print_macros(self):
        mtime = ' '
        if self.build.host_target[1].is_linux:
            mtime = ' --mtime ${tool:"tools/mtime0"} '
        if not self.cuda_use_clang.value:
            cmd = '$YMAKE_PYTHON ${input:"build/scripts/compile_cuda.py"}' + mtime + '$NVCC_OLD $NVCC_STD $NVCC_FLAGS -c ${input:SRC} -o ${output;suf=${OBJ_SUF}${NVCC_OBJ_EXT}:SRC} ${pre=-I:_C__INCLUDE} --cflags $C_FLAGS_PLATFORM $CXXFLAGS $NVCC_STD $NVCC_CFLAGS $SRCFLAGS ${input;hide:"build/platform/cuda/cuda_runtime_include.h"} $CUDA_HOST_COMPILER_ENV ${kv;hide:"p CC"} ${kv;hide:"pc light-green"}'  # noqa E501
        else:
            cmd = '$CXX_COMPILER_OLD --cuda-path=$CUDA_ROOT $C_FLAGS_PLATFORM -c ${input:SRC} -o ${output;suf=${OBJ_SUF}${NVCC_OBJ_EXT}:SRC} ${pre=-I:_C__INCLUDE} $CXXFLAGS $SRCFLAGS $TOOLCHAIN_ENV ${kv;hide:"p CU"} ${kv;hide:"pc green"}'  # noqa E501

        emit('_SRC_CU_CMD', cmd)
        emit('_SRC_CU_PEERDIR', ' '.join(sorted(self.peerdirs)))

    # This method is only used to set HAVE_CUDA=no automatically during ymake initialization
    # (i.e. is used only in `auto_have_cuda` invocation)
    def have_cuda_in_arcadia(self):
        host, target = self.build.host_target

        if not any((host.is_linux_x86_64, host.is_windows_x86_64)):
            return False

        if host != target:
            if not (host.is_linux_x86_64 and target.is_linux_armv8):
                return False
            if not self.cuda_version.from_user:
                return False

        if self.cuda_version.value in ('11.4', '11.8', '12.1', '12.2'):
            return True
        else:
            raise ConfigureError('CUDA version {} is not supported in Arcadia'.format(self.cuda_version.value))

    def auto_have_cuda(self):
        if is_positive('MUSL'):
            return False
        if self.build.is_sanitized:
            return False
        return self.cuda_root.from_user or self.use_arcadia_cuda.value and self.have_cuda_in_arcadia()

    def auto_cuda_version(self):
        if self.use_arcadia_cuda.value:
            return '11.4'

        if not self.have_cuda.value:
            return None

        nvcc_exe = self.build.host.exe(os.path.expanduser(self.cuda_root.value), 'bin', 'nvcc')

        def error():
            raise ConfigureError('Failed to get CUDA version from {}'.format(nvcc_exe))

        version_output = get_stdout([nvcc_exe, '--version']) or error()
        match = re.search(r'^Cuda compilation tools, release (\d+)\.\d+,', version_output, re.MULTILINE) or error()

        return match.group(1)

    def convert_major_version(self, value):
        if value == '11':
            return '11.4'
        else:
            return value

    def auto_cuda_architectures(self):
        # empty list does not mean "no architectures"
        # it means "no restriction -- any available architecture"

        host, target = self.build.host_target
        if not target.is_linux_x86_64:
            # do not impose any restrictions, when build not for "linux 64-bit"
            return ''

        # Equality to CUDA 11.4 is rather strict comparison
        # TODO: find out how we can relax check (e.g. to include more version of CUDA toolkit)
        if self.cuda_version.value == '11.4':
            # * use output of CUDA 11.4 `nvcc --help`
            # * drop support for '53', '62', '72' and '87'
            #   (these devices run only on arm64)
            # * drop support for '37'
            #   the single place it's used in Arcadia is https://a.yandex-team.ru/arcadia/sdg/sdc/third_party/cub/common.mk?rev=r13268523#L69
            return ':'.join(
                ['sm_35',
                 'sm_50', 'sm_52',
                 'sm_60', 'sm_61',
                 'sm_70', 'sm_75',
                 'sm_80', 'sm_86',
                 'compute_86'])
        else:
            return ''

    def auto_use_arcadia_cuda(self):
        return not self.cuda_root.from_user

    def auto_use_arcadia_cuda_host_compiler(self):
        return not self.cuda_host_compiler.from_user and not self.cuda_use_clang.value

    def auto_cuda_host_compiler(self):
        if not self.use_arcadia_cuda_host_compiler.value:
            return None

        host, target = self.build.host_target

        if host.is_windows_x86_64 and target.is_windows_x86_64:
            return self.cuda_windows_host_compiler()

        return select((
            (host.is_linux_x86_64 and target.is_linux_x86_64, '$CUDA_HOST_TOOLCHAIN_RESOURCE_GLOBAL/bin/clang'),
            (host.is_linux_x86_64 and target.is_linux_armv8, '$CUDA_HOST_TOOLCHAIN_RESOURCE_GLOBAL/bin/clang'),
        ))

    def cuda_windows_host_compiler(self):
        vc_version = '14.28.29910'

        env = {
            'Y_VC_Version': vc_version,
            'Y_VC_Root': '$CUDA_HOST_TOOLCHAIN_RESOURCE_GLOBAL/VC/Tools/MSVC/{}'.format(vc_version),
            'Y_SDK_Version': self.build.tc.sdk_version,
            'Y_SDK_Root': '$WINDOWS_KITS_RESOURCE_GLOBAL',
        }

        if not self.build.tc.ide_msvs:
            self.peerdirs.append('build/internal/platform/msvc')
        self.cuda_host_compiler_env.value = format_env(env)
        self.cuda_host_msvc_version.value = vc_version
        return '%(Y_VC_Root)s/bin/HostX64/x64/cl.exe' % env

    def setup_vc_root(self):
        if not self.cuda_host_compiler.from_user:
            return  # Already set in cuda_windows_host_compiler()

        if self.cuda_host_compiler_env.from_user:
            return  # We won't override user setting

        def is_root(dir):
            return all(os.path.isdir(os.path.join(dir, name)) for name in ('bin', 'include', 'lib'))

        def get_root():
            path, old_path = os.path.normpath(self.cuda_host_compiler.value), None
            while path != old_path:
                if is_root(path):
                    return path
                path, old_path = os.path.dirname(path), path

        vc_root = get_root()
        if vc_root:
            self.cuda_host_compiler_env.value = format_env({'Y_VC_Root': vc_root})


class CuDNN(object):
    def __init__(self, cuda):
        """
        :type cuda: Cuda
        """
        self.cuda = cuda

        self.cudnn_version = Setting('CUDNN_VERSION', auto=self.auto_cudnn_version)

    def have_cudnn(self):
        return self.cudnn_version.value in ('7.6.5', '8.0.5')

    def auto_cudnn_version(self):
        return '8.0.5'

    def print_(self):
        if self.cuda.have_cuda.value and self.have_cudnn():
            self.cudnn_version.emit()


def customization():
    if not is_positive('DISABLE_YMAKE_CONF_CUSTOMIZATION'):
        try:
            sys.path.insert(0, os.path.join(os.path.dirname(__file__), 'internal'))
            from custom_conf import CustomConf
            logger.debug('Customization extension was successfully loaded')
            return CustomConf
        except Exception as e:
            logger.debug('Customization extension was not found; [{}]'.format(str(e)))
    else:
        logger.debug('Customization extension was disabled')

    class DummyConf:
        def __init__(self, options):
            pass

        def print_prologue(self):
            pass

        def print_epilogue(self):
            pass

    return DummyConf


def main():
    options = opts()

    CustomConfig = customization()
    custom_conf = CustomConfig(options)

    arcadia = Arcadia(options.arcadia_root)

    ymake = YMake(arcadia)

    ymake.print_core_conf()

    _INTERNAL_CONF = 'internal/conf/internal.conf'
    internal_conf_full_path = find_conf(_INTERNAL_CONF)
    if internal_conf_full_path and not is_positive('DISABLE_YMAKE_CONF_CUSTOMIZATION'):
        print('@import "${{CONF_ROOT}}/{}"'.format(_INTERNAL_CONF))

    custom_conf.print_prologue()

    ymake.print_presets()
    ymake.print_settings()

    build = Build(arcadia, options.build_type, options.toolchain_params, force_ignore_local_files=not options.local_distbuild)
    build.print_build()

    custom_conf.print_epilogue()


if __name__ == '__main__':
    main()