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# Copyright 2012-2019 The Meson development team

# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at

#     http://www.apache.org/licenses/LICENSE-2.0

# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import abc
import contextlib, os.path, re
import enum
import itertools
import typing as T
from functools import lru_cache

from .. import coredata
from .. import mlog
from .. import mesonlib
from ..mesonlib import (
    EnvironmentException, MachineChoice, MesonException,
    Popen_safe, LibType, TemporaryDirectoryWinProof, OptionKey,
)

from ..arglist import CompilerArgs

if T.TYPE_CHECKING:
    from ..build import BuildTarget
    from ..coredata import OptionDictType, KeyedOptionDictType
    from ..envconfig import MachineInfo
    from ..environment import Environment
    from ..linkers import DynamicLinker  # noqa: F401
    from ..dependencies import Dependency

    CompilerType = T.TypeVar('CompilerType', bound=Compiler)
    _T = T.TypeVar('_T')

"""This file contains the data files of all compilers Meson knows
about. To support a new compiler, add its information below.
Also add corresponding autodetection code in environment.py."""

header_suffixes = ('h', 'hh', 'hpp', 'hxx', 'H', 'ipp', 'moc', 'vapi', 'di')  # type: T.Tuple[str, ...]
obj_suffixes = ('o', 'obj', 'res')  # type: T.Tuple[str, ...]
lib_suffixes = ('a', 'lib', 'dll', 'dll.a', 'dylib', 'so')  # type: T.Tuple[str, ...]
# Mapping of language to suffixes of files that should always be in that language
# This means we can't include .h headers here since they could be C, C++, ObjC, etc.
lang_suffixes = {
    'c': ('c',),
    'cpp': ('cpp', 'cc', 'cxx', 'c++', 'hh', 'hpp', 'ipp', 'hxx', 'ino', 'ixx'),
    'cuda': ('cu',),
    # f90, f95, f03, f08 are for free-form fortran ('f90' recommended)
    # f, for, ftn, fpp are for fixed-form fortran ('f' or 'for' recommended)
    'fortran': ('f90', 'f95', 'f03', 'f08', 'f', 'for', 'ftn', 'fpp'),
    'd': ('d', 'di'),
    'objc': ('m',),
    'objcpp': ('mm',),
    'rust': ('rs',),
    'vala': ('vala', 'vapi', 'gs'),
    'cs': ('cs',),
    'swift': ('swift',),
    'java': ('java',),
}  # type: T.Dict[str, T.Tuple[str, ...]]
all_languages = lang_suffixes.keys()
cpp_suffixes = lang_suffixes['cpp'] + ('h',)  # type: T.Tuple[str, ...]
c_suffixes = lang_suffixes['c'] + ('h',)  # type: T.Tuple[str, ...]
# List of languages that by default consume and output libraries following the
# C ABI; these can generally be used interchangeably
clib_langs = ('objcpp', 'cpp', 'objc', 'c', 'fortran',)  # type: T.Tuple[str, ...]
# List of languages that can be linked with C code directly by the linker
# used in build.py:process_compilers() and build.py:get_dynamic_linker()
clink_langs = ('d', 'cuda') + clib_langs  # type: T.Tuple[str, ...]
clink_suffixes = tuple()  # type: T.Tuple[str, ...]
for _l in clink_langs + ('vala',):
    clink_suffixes += lang_suffixes[_l]
clink_suffixes += ('h', 'll', 's')
all_suffixes = set(itertools.chain(*lang_suffixes.values(), clink_suffixes))  # type: T.Set[str]

# Languages that should use LDFLAGS arguments when linking.
LANGUAGES_USING_LDFLAGS = {'objcpp', 'cpp', 'objc', 'c', 'fortran', 'd', 'cuda'}  # type: T.Set[str]
# Languages that should use CPPFLAGS arguments when linking.
LANGUAGES_USING_CPPFLAGS = {'c', 'cpp', 'objc', 'objcpp'}  # type: T.Set[str]
soregex = re.compile(r'.*\.so(\.[0-9]+)?(\.[0-9]+)?(\.[0-9]+)?$')

# Environment variables that each lang uses.
CFLAGS_MAPPING: T.Mapping[str, str] = {
    'c': 'CFLAGS',
    'cpp': 'CXXFLAGS',
    'cuda': 'CUFLAGS',
    'objc': 'OBJCFLAGS',
    'objcpp': 'OBJCXXFLAGS',
    'fortran': 'FFLAGS',
    'd': 'DFLAGS',
    'vala': 'VALAFLAGS',
    'rust': 'RUSTFLAGS',
}

CEXE_MAPPING: T.Mapping = {
    'c': 'CC',
    'cpp': 'CXX',
}

# All these are only for C-linkable languages; see `clink_langs` above.

def sort_clink(lang: str) -> int:
    '''
    Sorting function to sort the list of languages according to
    reversed(compilers.clink_langs) and append the unknown langs in the end.
    The purpose is to prefer C over C++ for files that can be compiled by
    both such as assembly, C, etc. Also applies to ObjC, ObjC++, etc.
    '''
    if lang not in clink_langs:
        return 1
    return -clink_langs.index(lang)

def is_header(fname: 'mesonlib.FileOrString') -> bool:
    if isinstance(fname, mesonlib.File):
        fname = fname.fname
    suffix = fname.split('.')[-1]
    return suffix in header_suffixes

def is_source(fname: 'mesonlib.FileOrString') -> bool:
    if isinstance(fname, mesonlib.File):
        fname = fname.fname
    suffix = fname.split('.')[-1].lower()
    return suffix in clink_suffixes

def is_assembly(fname: 'mesonlib.FileOrString') -> bool:
    if isinstance(fname, mesonlib.File):
        fname = fname.fname
    return fname.split('.')[-1].lower() == 's'

def is_llvm_ir(fname: 'mesonlib.FileOrString') -> bool:
    if isinstance(fname, mesonlib.File):
        fname = fname.fname
    return fname.split('.')[-1] == 'll'

@lru_cache(maxsize=None)
def cached_by_name(fname: 'mesonlib.FileOrString') -> bool:
    suffix = fname.split('.')[-1]
    return suffix in obj_suffixes

def is_object(fname: 'mesonlib.FileOrString') -> bool:
    if isinstance(fname, mesonlib.File):
        fname = fname.fname
    return cached_by_name(fname)

def is_library(fname: 'mesonlib.FileOrString') -> bool:
    if isinstance(fname, mesonlib.File):
        fname = fname.fname

    if soregex.match(fname):
        return True

    suffix = fname.split('.')[-1]
    return suffix in lib_suffixes

def is_known_suffix(fname: 'mesonlib.FileOrString') -> bool:
    if isinstance(fname, mesonlib.File):
        fname = fname.fname
    suffix = fname.split('.')[-1]

    return suffix in all_suffixes


class CompileCheckMode(enum.Enum):

    PREPROCESS = 'preprocess'
    COMPILE = 'compile'
    LINK = 'link'


cuda_buildtype_args = {'plain': [],
                       'debug': ['-g', '-G'],
                       'debugoptimized': ['-g', '-lineinfo'],
                       'release': [],
                       'minsize': [],
                       'custom': [],
                       }  # type: T.Dict[str, T.List[str]]
java_buildtype_args = {'plain': [],
                       'debug': ['-g'],
                       'debugoptimized': ['-g'],
                       'release': [],
                       'minsize': [],
                       'custom': [],
                       }  # type: T.Dict[str, T.List[str]]

rust_buildtype_args = {'plain': [],
                       'debug': [],
                       'debugoptimized': [],
                       'release': [],
                       'minsize': [],
                       'custom': [],
                       }  # type: T.Dict[str, T.List[str]]

d_gdc_buildtype_args = {'plain': [],
                        'debug': [],
                        'debugoptimized': ['-finline-functions'],
                        'release': ['-finline-functions'],
                        'minsize': [],
                        'custom': [],
                        }  # type: T.Dict[str, T.List[str]]

d_ldc_buildtype_args = {'plain': [],
                        'debug': [],
                        'debugoptimized': ['-enable-inlining', '-Hkeep-all-bodies'],
                        'release': ['-enable-inlining', '-Hkeep-all-bodies'],
                        'minsize': [],
                        'custom': [],
                        }  # type: T.Dict[str, T.List[str]]

d_dmd_buildtype_args = {'plain': [],
                        'debug': [],
                        'debugoptimized': ['-inline'],
                        'release': ['-inline'],
                        'minsize': [],
                        'custom': [],
                        }  # type: T.Dict[str, T.List[str]]

mono_buildtype_args = {'plain': [],
                       'debug': [],
                       'debugoptimized': ['-optimize+'],
                       'release': ['-optimize+'],
                       'minsize': [],
                       'custom': [],
                       }  # type: T.Dict[str, T.List[str]]

swift_buildtype_args = {'plain': [],
                        'debug': [],
                        'debugoptimized': [],
                        'release': [],
                        'minsize': [],
                        'custom': [],
                        }  # type: T.Dict[str, T.List[str]]

gnu_winlibs = ['-lkernel32', '-luser32', '-lgdi32', '-lwinspool', '-lshell32',
               '-lole32', '-loleaut32', '-luuid', '-lcomdlg32', '-ladvapi32']  # type: T.List[str]

msvc_winlibs = ['kernel32.lib', 'user32.lib', 'gdi32.lib',
                'winspool.lib', 'shell32.lib', 'ole32.lib', 'oleaut32.lib',
                'uuid.lib', 'comdlg32.lib', 'advapi32.lib']  # type: T.List[str]

clike_optimization_args = {'0': [],
                           'g': [],
                           '1': ['-O1'],
                           '2': ['-O2'],
                           '3': ['-O3'],
                           's': ['-Os'],
                           }  # type: T.Dict[str, T.List[str]]

cuda_optimization_args = {'0': [],
                          'g': ['-O0'],
                          '1': ['-O1'],
                          '2': ['-O2'],
                          '3': ['-O3'],
                          's': ['-O3']
                          }  # type: T.Dict[str, T.List[str]]

cuda_debug_args = {False: [],
                   True: ['-g']}  # type: T.Dict[bool, T.List[str]]

clike_debug_args = {False: [],
                    True: ['-g']}  # type: T.Dict[bool, T.List[str]]

base_options: 'KeyedOptionDictType' = {
    OptionKey('b_pch'): coredata.UserBooleanOption('Use precompiled headers', True),
    OptionKey('b_lto'): coredata.UserBooleanOption('Use link time optimization', False),
    OptionKey('b_lto'): coredata.UserBooleanOption('Use link time optimization', False),
    OptionKey('b_lto_threads'): coredata.UserIntegerOption('Use multiple threads for Link Time Optimization', (None, None,0)),
    OptionKey('b_lto_mode'): coredata.UserComboOption('Select between different LTO modes.',
                                                      ['default', 'thin'],
                                                      'default'),
    OptionKey('b_sanitize'): coredata.UserComboOption('Code sanitizer to use',
                                                      ['none', 'address', 'thread', 'undefined', 'memory', 'address,undefined'],
                                                      'none'),
    OptionKey('b_lundef'): coredata.UserBooleanOption('Use -Wl,--no-undefined when linking', True),
    OptionKey('b_asneeded'): coredata.UserBooleanOption('Use -Wl,--as-needed when linking', True),
    OptionKey('b_pgo'): coredata.UserComboOption('Use profile guided optimization',
                                                 ['off', 'generate', 'use'],
                                                 'off'),
    OptionKey('b_coverage'): coredata.UserBooleanOption('Enable coverage tracking.', False),
    OptionKey('b_colorout'): coredata.UserComboOption('Use colored output',
                                                      ['auto', 'always', 'never'],
                                                      'always'),
    OptionKey('b_ndebug'): coredata.UserComboOption('Disable asserts', ['true', 'false', 'if-release'], 'false'),
    OptionKey('b_staticpic'): coredata.UserBooleanOption('Build static libraries as position independent', True),
    OptionKey('b_pie'): coredata.UserBooleanOption('Build executables as position independent', False),
    OptionKey('b_bitcode'): coredata.UserBooleanOption('Generate and embed bitcode (only macOS/iOS/tvOS)', False),
    OptionKey('b_vscrt'): coredata.UserComboOption('VS run-time library type to use.',
                                                   ['none', 'md', 'mdd', 'mt', 'mtd', 'from_buildtype', 'static_from_buildtype'],
                                                   'from_buildtype'),
}

def option_enabled(boptions: T.Set[OptionKey], options: 'KeyedOptionDictType',
                   option: OptionKey) -> bool:
    try:
        if option not in boptions:
            return False
        ret = options[option].value
        assert isinstance(ret, bool), 'must return bool'  # could also be str
        return ret
    except KeyError:
        return False


def get_option_value(options: 'KeyedOptionDictType', opt: OptionKey, fallback: '_T') -> '_T':
    """Get the value of an option, or the fallback value."""
    try:
        v: '_T' = options[opt].value
    except KeyError:
        return fallback

    assert isinstance(v, type(fallback)), f'Should have {type(fallback)!r} but was {type(v)!r}'
    # Mypy doesn't understand that the above assert ensures that v is type _T
    return v


def get_base_compile_args(options: 'KeyedOptionDictType', compiler: 'Compiler') -> T.List[str]:
    args = []  # type T.List[str]
    try:
        if options[OptionKey('b_lto')].value:
            args.extend(compiler.get_lto_compile_args(
                threads=get_option_value(options, OptionKey('b_lto_threads'), 0),
                mode=get_option_value(options, OptionKey('b_lto_mode'), 'default')))
    except KeyError:
        pass
    try:
        args += compiler.get_colorout_args(options[OptionKey('b_colorout')].value)
    except KeyError:
        pass
    try:
        args += compiler.sanitizer_compile_args(options[OptionKey('b_sanitize')].value)
    except KeyError:
        pass
    try:
        pgo_val = options[OptionKey('b_pgo')].value
        if pgo_val == 'generate':
            args.extend(compiler.get_profile_generate_args())
        elif pgo_val == 'use':
            args.extend(compiler.get_profile_use_args())
    except KeyError:
        pass
    try:
        if options[OptionKey('b_coverage')].value:
            args += compiler.get_coverage_args()
    except KeyError:
        pass
    try:
        if (options[OptionKey('b_ndebug')].value == 'true' or
                (options[OptionKey('b_ndebug')].value == 'if-release' and
                 options[OptionKey('buildtype')].value in {'release', 'plain'})):
            args += compiler.get_disable_assert_args()
    except KeyError:
        pass
    # This does not need a try...except
    if option_enabled(compiler.base_options, options, OptionKey('b_bitcode')):
        args.append('-fembed-bitcode')
    try:
        crt_val = options[OptionKey('b_vscrt')].value
        buildtype = options[OptionKey('buildtype')].value
        try:
            args += compiler.get_crt_compile_args(crt_val, buildtype)
        except AttributeError:
            pass
    except KeyError:
        pass
    return args

def get_base_link_args(options: 'KeyedOptionDictType', linker: 'Compiler',
                       is_shared_module: bool) -> T.List[str]:
    args = []  # type: T.List[str]
    try:
        if options[OptionKey('b_lto')].value:
            args.extend(linker.get_lto_link_args(
                threads=get_option_value(options, OptionKey('b_lto_threads'), 0),
                mode=get_option_value(options, OptionKey('b_lto_mode'), 'default')))
    except KeyError:
        pass
    try:
        args += linker.sanitizer_link_args(options[OptionKey('b_sanitize')].value)
    except KeyError:
        pass
    try:
        pgo_val = options[OptionKey('b_pgo')].value
        if pgo_val == 'generate':
            args.extend(linker.get_profile_generate_args())
        elif pgo_val == 'use':
            args.extend(linker.get_profile_use_args())
    except KeyError:
        pass
    try:
        if options[OptionKey('b_coverage')].value:
            args += linker.get_coverage_link_args()
    except KeyError:
        pass

    as_needed = option_enabled(linker.base_options, options, OptionKey('b_asneeded'))
    bitcode = option_enabled(linker.base_options, options, OptionKey('b_bitcode'))
    # Shared modules cannot be built with bitcode_bundle because
    # -bitcode_bundle is incompatible with -undefined and -bundle
    if bitcode and not is_shared_module:
        args.extend(linker.bitcode_args())
    elif as_needed:
        # -Wl,-dead_strip_dylibs is incompatible with bitcode
        args.extend(linker.get_asneeded_args())

    # Apple's ld (the only one that supports bitcode) does not like -undefined
    # arguments or -headerpad_max_install_names when bitcode is enabled
    if not bitcode:
        args.extend(linker.headerpad_args())
        if (not is_shared_module and
                option_enabled(linker.base_options, options, OptionKey('b_lundef'))):
            args.extend(linker.no_undefined_link_args())
        else:
            args.extend(linker.get_allow_undefined_link_args())

    try:
        crt_val = options[OptionKey('b_vscrt')].value
        buildtype = options[OptionKey('buildtype')].value
        try:
            args += linker.get_crt_link_args(crt_val, buildtype)
        except AttributeError:
            pass
    except KeyError:
        pass
    return args


class CrossNoRunException(MesonException):
    pass

class RunResult:
    def __init__(self, compiled: bool, returncode: int = 999,
                 stdout: str = 'UNDEFINED', stderr: str = 'UNDEFINED'):
        self.compiled = compiled
        self.returncode = returncode
        self.stdout = stdout
        self.stderr = stderr


class CompileResult:

    """The result of Compiler.compiles (and friends)."""

    def __init__(self, stdo: T.Optional[str] = None, stde: T.Optional[str] = None,
                 args: T.Optional[T.List[str]] = None,
                 returncode: int = 999, pid: int = -1,
                 text_mode: bool = True,
                 input_name: T.Optional[str] = None,
                 output_name: T.Optional[str] = None,
                 command: T.Optional[T.List[str]] = None, cached: bool = False):
        self.stdout = stdo
        self.stderr = stde
        self.input_name = input_name
        self.output_name = output_name
        self.command = command or []
        self.args = args or []
        self.cached = cached
        self.returncode = returncode
        self.pid = pid
        self.text_mode = text_mode


class Compiler(metaclass=abc.ABCMeta):
    # Libraries to ignore in find_library() since they are provided by the
    # compiler or the C library. Currently only used for MSVC.
    ignore_libs = []  # type: T.List[str]
    # Libraries that are internal compiler implementations, and must not be
    # manually searched.
    internal_libs = []  # type: T.List[str]

    LINKER_PREFIX = None  # type: T.Union[None, str, T.List[str]]
    INVOKES_LINKER = True

    # TODO: these could be forward declarations once we drop 3.5 support
    if T.TYPE_CHECKING:
        language = 'unset'
        id = ''
        warn_args = {}  # type: T.Dict[str, T.List[str]]

    def __init__(self, exelist: T.List[str], version: str,
                 for_machine: MachineChoice, info: 'MachineInfo',
                 linker: T.Optional['DynamicLinker'] = None,
                 full_version: T.Optional[str] = None, is_cross: bool = False):
        self.exelist = exelist
        # In case it's been overridden by a child class already
        if not hasattr(self, 'file_suffixes'):
            self.file_suffixes = lang_suffixes[self.language]
        if not hasattr(self, 'can_compile_suffixes'):
            self.can_compile_suffixes = set(self.file_suffixes)
        self.default_suffix = self.file_suffixes[0]
        self.version = version
        self.full_version = full_version
        self.for_machine = for_machine
        self.base_options: T.Set[OptionKey] = set()
        self.linker = linker
        self.info = info
        self.is_cross = is_cross

    def __repr__(self) -> str:
        repr_str = "<{0}: v{1} `{2}`>"
        return repr_str.format(self.__class__.__name__, self.version,
                               ' '.join(self.exelist))

    @lru_cache(maxsize=None)
    def can_compile(self, src: 'mesonlib.FileOrString') -> bool:
        if isinstance(src, mesonlib.File):
            src = src.fname
        suffix = os.path.splitext(src)[1].lower()
        return bool(suffix) and suffix[1:] in self.can_compile_suffixes

    def get_id(self) -> str:
        return self.id

    def get_linker_id(self) -> str:
        # There is not guarantee that we have a dynamic linker instance, as
        # some languages don't have separate linkers and compilers. In those
        # cases return the compiler id
        try:
            return self.linker.id
        except AttributeError:
            return self.id

    def get_version_string(self) -> str:
        details = [self.id, self.version]
        if self.full_version:
            details += ['"%s"' % (self.full_version)]
        return '(%s)' % (' '.join(details))

    def get_language(self) -> str:
        return self.language

    @classmethod
    def get_display_language(cls) -> str:
        return cls.language.capitalize()

    def get_default_suffix(self) -> str:
        return self.default_suffix

    def get_define(self, dname: str, prefix: str, env: 'Environment',
                   extra_args: T.List[str], dependencies: T.List['Dependency'],
                   disable_cache: bool = False) -> T.Tuple[str, bool]:
        raise EnvironmentException('%s does not support get_define ' % self.get_id())

    def compute_int(self, expression: str, low: T.Optional[int], high: T.Optional[int],
                    guess: T.Optional[int], prefix: str, env: 'Environment', *,
                    extra_args: T.Optional[T.List[str]], dependencies: T.Optional[T.List['Dependency']]) -> int:
        raise EnvironmentException('%s does not support compute_int ' % self.get_id())

    def compute_parameters_with_absolute_paths(self, parameter_list: T.List[str],
                                               build_dir: str) -> T.List[str]:
        raise EnvironmentException('%s does not support compute_parameters_with_absolute_paths ' % self.get_id())

    def has_members(self, typename: str, membernames: T.List[str],
                    prefix: str, env: 'Environment', *,
                    extra_args: T.Optional[T.List[str]] = None,
                    dependencies: T.Optional[T.List['Dependency']] = None) -> T.Tuple[bool, bool]:
        raise EnvironmentException('%s does not support has_member(s) ' % self.get_id())

    def has_type(self, typename: str, prefix: str, env: 'Environment',
                 extra_args: T.List[str], *,
                 dependencies: T.Optional[T.List['Dependency']] = None) -> T.Tuple[bool, bool]:
        raise EnvironmentException('%s does not support has_type ' % self.get_id())

    def symbols_have_underscore_prefix(self, env: 'Environment') -> bool:
        raise EnvironmentException('%s does not support symbols_have_underscore_prefix ' % self.get_id())

    def get_exelist(self) -> T.List[str]:
        return self.exelist.copy()

    def get_linker_exelist(self) -> T.List[str]:
        return self.linker.get_exelist()

    @abc.abstractmethod
    def get_output_args(self, outputname: str) -> T.List[str]:
        pass

    def get_linker_output_args(self, outputname: str) -> T.List[str]:
        return self.linker.get_output_args(outputname)

    def get_builtin_define(self, define: str) -> T.Optional[str]:
        raise EnvironmentException('%s does not support get_builtin_define.' % self.id)

    def has_builtin_define(self, define: str) -> bool:
        raise EnvironmentException('%s does not support has_builtin_define.' % self.id)

    def get_always_args(self) -> T.List[str]:
        return []

    def can_linker_accept_rsp(self) -> bool:
        """
        Determines whether the linker can accept arguments using the @rsp syntax.
        """
        return self.linker.get_accepts_rsp()

    def get_linker_always_args(self) -> T.List[str]:
        return self.linker.get_always_args()

    def get_linker_lib_prefix(self) -> str:
        return self.linker.get_lib_prefix()

    def gen_import_library_args(self, implibname: str) -> T.List[str]:
        """
        Used only on Windows for libraries that need an import library.
        This currently means C, C++, Fortran.
        """
        return []

    def get_options(self) -> 'KeyedOptionDictType':
        return {}

    def get_option_compile_args(self, options: 'KeyedOptionDictType') -> T.List[str]:
        return []

    def get_option_link_args(self, options: 'KeyedOptionDictType') -> T.List[str]:
        return self.linker.get_option_args(options)

    def check_header(self, hname: str, prefix: str, env: 'Environment', *,
                     extra_args: T.Optional[T.List[str]] = None,
                     dependencies: T.Optional[T.List['Dependency']] = None) -> T.Tuple[bool, bool]:
        """Check that header is usable.

        Returns a two item tuple of bools. The first bool is whether the
        check succeeded, the second is whether the result was cached (True)
        or run fresh (False).
        """
        raise EnvironmentException('Language %s does not support header checks.' % self.get_display_language())

    def has_header(self, hname: str, prefix: str, env: 'Environment', *,
                   extra_args: T.Optional[T.List[str]] = None,
                   dependencies: T.Optional[T.List['Dependency']] = None,
                   disable_cache: bool = False) -> T.Tuple[bool, bool]:
        """Check that header is exists.

        This check will return true if the file exists, even if it contains:

        ```c
        # error "You thought you could use this, LOLZ!"
        ```

        Use check_header if your header only works in some cases.

        Returns a two item tuple of bools. The first bool is whether the
        check succeeded, the second is whether the result was cached (True)
        or run fresh (False).
        """
        raise EnvironmentException('Language %s does not support header checks.' % self.get_display_language())

    def has_header_symbol(self, hname: str, symbol: str, prefix: str,
                          env: 'Environment', *,
                          extra_args: T.Optional[T.List[str]] = None,
                          dependencies: T.Optional[T.List['Dependency']] = None) -> T.Tuple[bool, bool]:
        raise EnvironmentException('Language %s does not support header symbol checks.' % self.get_display_language())

    def run(self, code: str, env: 'Environment', *,
            extra_args: T.Optional[T.List[str]] = None,
            dependencies: T.Optional[T.List['Dependency']] = None) -> RunResult:
        raise EnvironmentException('Language %s does not support run checks.' % self.get_display_language())

    def sizeof(self, typename: str, prefix: str, env: 'Environment', *,
               extra_args: T.Optional[T.List[str]] = None,
               dependencies: T.Optional[T.List['Dependency']] = None) -> int:
        raise EnvironmentException('Language %s does not support sizeof checks.' % self.get_display_language())

    def alignment(self, typename: str, prefix: str, env: 'Environment', *,
                 extra_args: T.Optional[T.List[str]] = None,
                 dependencies: T.Optional[T.List['Dependency']] = None) -> int:
        raise EnvironmentException('Language %s does not support alignment checks.' % self.get_display_language())

    def has_function(self, funcname: str, prefix: str, env: 'Environment', *,
                     extra_args: T.Optional[T.List[str]] = None,
                     dependencies: T.Optional[T.List['Dependency']] = None) -> T.Tuple[bool, bool]:
        """See if a function exists.

        Returns a two item tuple of bools. The first bool is whether the
        check succeeded, the second is whether the result was cached (True)
        or run fresh (False).
        """
        raise EnvironmentException('Language %s does not support function checks.' % self.get_display_language())

    def unix_args_to_native(self, args: T.List[str]) -> T.List[str]:
        "Always returns a copy that can be independently mutated"
        return args.copy()

    @classmethod
    def native_args_to_unix(cls, args: T.List[str]) -> T.List[str]:
        "Always returns a copy that can be independently mutated"
        return args.copy()

    def find_library(self, libname: str, env: 'Environment', extra_dirs: T.List[str],
                     libtype: LibType = LibType.PREFER_SHARED) -> T.Optional[T.List[str]]:
        raise EnvironmentException('Language {} does not support library finding.'.format(self.get_display_language()))

    def get_library_naming(self, env: 'Environment', libtype: LibType,
                           strict: bool = False) -> T.Optional[T.Tuple[str, ...]]:
        raise EnvironmentException(
            'Language {} does not support get_library_naming.'.format(
                self.get_display_language()))

    def get_program_dirs(self, env: 'Environment') -> T.List[str]:
        return []

    def has_multi_arguments(self, args: T.List[str], env: 'Environment') -> T.Tuple[bool, bool]:
        raise EnvironmentException(
            'Language {} does not support has_multi_arguments.'.format(
                self.get_display_language()))

    def has_multi_link_arguments(self, args: T.List[str], env: 'Environment') -> T.Tuple[bool, bool]:
        return self.linker.has_multi_arguments(args, env)

    def _get_compile_output(self, dirname: str, mode: str) -> str:
        # TODO: mode should really be an enum
        # In pre-processor mode, the output is sent to stdout and discarded
        if mode == 'preprocess':
            return None
        # Extension only matters if running results; '.exe' is
        # guaranteed to be executable on every platform.
        if mode == 'link':
            suffix = 'exe'
        else:
            suffix = 'obj'
        return os.path.join(dirname, 'output.' + suffix)

    def get_compiler_args_for_mode(self, mode: CompileCheckMode) -> T.List[str]:
        # TODO: mode should really be an enum
        args = []  # type: T.List[str]
        args += self.get_always_args()
        if mode is CompileCheckMode.COMPILE:
            args += self.get_compile_only_args()
        elif mode is CompileCheckMode.PREPROCESS:
            args += self.get_preprocess_only_args()
        else:
            assert mode is CompileCheckMode.LINK
        return args

    def compiler_args(self, args: T.Optional[T.Iterable[str]] = None) -> CompilerArgs:
        """Return an appropriate CompilerArgs instance for this class."""
        return CompilerArgs(self, args)

    @contextlib.contextmanager
    def compile(self, code: 'mesonlib.FileOrString',
                extra_args: T.Union[None, CompilerArgs, T.List[str]] = None,
                *, mode: str = 'link', want_output: bool = False,
                temp_dir: T.Optional[str] = None) -> T.Iterator[T.Optional[CompileResult]]:
        # TODO: there isn't really any reason for this to be a contextmanager
        if extra_args is None:
            extra_args = []