Adding upstream version 1.0.1.upstream/1.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 858 insertions, 0 deletions

diff --git a/mesonbuild/environment.py b/mesonbuild/environment.py
new file mode 100644
index 0000000..a06d35e
--- /dev/null
+++ b/mesonbuild/environment.py
@@ -0,0 +1,858 @@
+# Copyright 2012-2020 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.
+from __future__ import annotations
+
+import itertools
+import os, platform, re, sys, shutil
+import typing as T
+import collections
+
+from . import coredata
+from . import mesonlib
+from .mesonlib import (
+    MesonException, MachineChoice, Popen_safe, PerMachine,
+    PerMachineDefaultable, PerThreeMachineDefaultable, split_args, quote_arg, OptionKey,
+    search_version, MesonBugException
+)
+from . import mlog
+from .programs import ExternalProgram
+
+from .envconfig import (
+    BinaryTable, MachineInfo, Properties, known_cpu_families, CMakeVariables,
+)
+from . import compilers
+from .compilers import (
+    Compiler,
+    is_assembly,
+    is_header,
+    is_library,
+    is_llvm_ir,
+    is_object,
+    is_source,
+)
+
+from functools import lru_cache
+from mesonbuild import envconfig
+
+if T.TYPE_CHECKING:
+    import argparse
+    from configparser import ConfigParser
+
+    from .wrap.wrap import Resolver
+
+    CompilersDict = T.Dict[str, Compiler]
+
+
+build_filename = 'meson.build'
+
+
+def _get_env_var(for_machine: MachineChoice, is_cross: bool, var_name: str) -> T.Optional[str]:
+    """
+    Returns the exact env var and the value.
+    """
+    candidates = PerMachine(
+        # The prefixed build version takes priority, but if we are native
+        # compiling we fall back on the unprefixed host version. This
+        # allows native builds to never need to worry about the 'BUILD_*'
+        # ones.
+        ([var_name + '_FOR_BUILD'] if is_cross else [var_name]),
+        # Always just the unprefixed host versions
+        [var_name]
+    )[for_machine]
+    for var in candidates:
+        value = os.environ.get(var)
+        if value is not None:
+            break
+    else:
+        formatted = ', '.join([f'{var!r}' for var in candidates])
+        mlog.debug(f'None of {formatted} are defined in the environment, not changing global flags.')
+        return None
+    mlog.debug(f'Using {var!r} from environment with value: {value!r}')
+    return value
+
+
+def detect_gcovr(min_version='3.3', log=False):
+    gcovr_exe = 'gcovr'
+    try:
+        p, found = Popen_safe([gcovr_exe, '--version'])[0:2]
+    except (FileNotFoundError, PermissionError):
+        # Doesn't exist in PATH or isn't executable
+        return None, None
+    found = search_version(found)
+    if p.returncode == 0 and mesonlib.version_compare(found, '>=' + min_version):
+        if log:
+            mlog.log('Found gcovr-{} at {}'.format(found, quote_arg(shutil.which(gcovr_exe))))
+        return gcovr_exe, found
+    return None, None
+
+def detect_llvm_cov():
+    tools = get_llvm_tool_names('llvm-cov')
+    for tool in tools:
+        if mesonlib.exe_exists([tool, '--version']):
+            return tool
+    return None
+
+def find_coverage_tools() -> T.Tuple[T.Optional[str], T.Optional[str], T.Optional[str], T.Optional[str], T.Optional[str]]:
+    gcovr_exe, gcovr_version = detect_gcovr()
+
+    llvm_cov_exe = detect_llvm_cov()
+
+    lcov_exe = 'lcov'
+    genhtml_exe = 'genhtml'
+
+    if not mesonlib.exe_exists([lcov_exe, '--version']):
+        lcov_exe = None
+    if not mesonlib.exe_exists([genhtml_exe, '--version']):
+        genhtml_exe = None
+
+    return gcovr_exe, gcovr_version, lcov_exe, genhtml_exe, llvm_cov_exe
+
+def detect_ninja(version: str = '1.8.2', log: bool = False) -> T.List[str]:
+    r = detect_ninja_command_and_version(version, log)
+    return r[0] if r else None
+
+def detect_ninja_command_and_version(version: str = '1.8.2', log: bool = False) -> T.Tuple[T.List[str], str]:
+    env_ninja = os.environ.get('NINJA', None)
+    for n in [env_ninja] if env_ninja else ['ninja', 'ninja-build', 'samu']:
+        prog = ExternalProgram(n, silent=True)
+        if not prog.found():
+            continue
+        try:
+            p, found = Popen_safe(prog.command + ['--version'])[0:2]
+        except (FileNotFoundError, PermissionError):
+            # Doesn't exist in PATH or isn't executable
+            continue
+        found = found.strip()
+        # Perhaps we should add a way for the caller to know the failure mode
+        # (not found or too old)
+        if p.returncode == 0 and mesonlib.version_compare(found, '>=' + version):
+            if log:
+                name = os.path.basename(n)
+                if name.endswith('-' + found):
+                    name = name[0:-1 - len(found)]
+                if name == 'ninja-build':
+                    name = 'ninja'
+                if name == 'samu':
+                    name = 'samurai'
+                mlog.log('Found {}-{} at {}'.format(name, found,
+                         ' '.join([quote_arg(x) for x in prog.command])))
+            return (prog.command, found)
+
+def get_llvm_tool_names(tool: str) -> T.List[str]:
+    # Ordered list of possible suffixes of LLVM executables to try. Start with
+    # base, then try newest back to oldest (3.5 is arbitrary), and finally the
+    # devel version. Please note that the development snapshot in Debian does
+    # not have a distinct name. Do not move it to the beginning of the list
+    # unless it becomes a stable release.
+    suffixes = [
+        '', # base (no suffix)
+        '-14',  '14',
+        '-13',  '13',
+        '-12',  '12',
+        '-11',  '11',
+        '-10',  '10',
+        '-9',   '90',
+        '-8',   '80',
+        '-7',   '70',
+        '-6.0', '60',
+        '-5.0', '50',
+        '-4.0', '40',
+        '-3.9', '39',
+        '-3.8', '38',
+        '-3.7', '37',
+        '-3.6', '36',
+        '-3.5', '35',
+        '-15',    # Debian development snapshot
+        '-devel', # FreeBSD development snapshot
+    ]
+    names = []
+    for suffix in suffixes:
+        names.append(tool + suffix)
+    return names
+
+def detect_scanbuild() -> T.List[str]:
+    """ Look for scan-build binary on build platform
+
+    First, if a SCANBUILD env variable has been provided, give it precedence
+    on all platforms.
+
+    For most platforms, scan-build is found is the PATH contains a binary
+    named "scan-build". However, some distribution's package manager (FreeBSD)
+    don't. For those, loop through a list of candidates to see if one is
+    available.
+
+    Return: a single-element list of the found scan-build binary ready to be
+        passed to Popen()
+    """
+    exelist = []
+    if 'SCANBUILD' in os.environ:
+        exelist = split_args(os.environ['SCANBUILD'])
+
+    else:
+        tools = get_llvm_tool_names('scan-build')
+        for tool in tools:
+            if shutil.which(tool) is not None:
+                exelist = [shutil.which(tool)]
+                break
+
+    if exelist:
+        tool = exelist[0]
+        if os.path.isfile(tool) and os.access(tool, os.X_OK):
+            return [tool]
+    return []
+
+def detect_clangformat() -> T.List[str]:
+    """ Look for clang-format binary on build platform
+
+    Do the same thing as detect_scanbuild to find clang-format except it
+    currently does not check the environment variable.
+
+    Return: a single-element list of the found clang-format binary ready to be
+        passed to Popen()
+    """
+    tools = get_llvm_tool_names('clang-format')
+    for tool in tools:
+        path = shutil.which(tool)
+        if path is not None:
+            return [path]
+    return []
+
+def detect_windows_arch(compilers: CompilersDict) -> str:
+    """
+    Detecting the 'native' architecture of Windows is not a trivial task. We
+    cannot trust that the architecture that Python is built for is the 'native'
+    one because you can run 32-bit apps on 64-bit Windows using WOW64 and
+    people sometimes install 32-bit Python on 64-bit Windows.
+
+    We also can't rely on the architecture of the OS itself, since it's
+    perfectly normal to compile and run 32-bit applications on Windows as if
+    they were native applications. It's a terrible experience to require the
+    user to supply a cross-info file to compile 32-bit applications on 64-bit
+    Windows. Thankfully, the only way to compile things with Visual Studio on
+    Windows is by entering the 'msvc toolchain' environment, which can be
+    easily detected.
+
+    In the end, the sanest method is as follows:
+    1. Check environment variables that are set by Windows and WOW64 to find out
+       if this is x86 (possibly in WOW64), if so use that as our 'native'
+       architecture.
+    2. If the compiler toolchain target architecture is x86, use that as our
+      'native' architecture.
+    3. Otherwise, use the actual Windows architecture
+
+    """
+    os_arch = mesonlib.windows_detect_native_arch()
+    if os_arch == 'x86':
+        return os_arch
+    # If we're on 64-bit Windows, 32-bit apps can be compiled without
+    # cross-compilation. So if we're doing that, just set the native arch as
+    # 32-bit and pretend like we're running under WOW64. Else, return the
+    # actual Windows architecture that we deduced above.
+    for compiler in compilers.values():
+        if compiler.id == 'msvc' and (compiler.target in {'x86', '80x86'}):
+            return 'x86'
+        if compiler.id == 'clang-cl' and compiler.target == 'x86':
+            return 'x86'
+        if compiler.id == 'gcc' and compiler.has_builtin_define('__i386__'):
+            return 'x86'
+    return os_arch
+
+def any_compiler_has_define(compilers: CompilersDict, define):
+    for c in compilers.values():
+        try:
+            if c.has_builtin_define(define):
+                return True
+        except mesonlib.MesonException:
+            # Ignore compilers that do not support has_builtin_define.
+            pass
+    return False
+
+def detect_cpu_family(compilers: CompilersDict) -> str:
+    """
+    Python is inconsistent in its platform module.
+    It returns different values for the same cpu.
+    For x86 it might return 'x86', 'i686' or somesuch.
+    Do some canonicalization.
+    """
+    if mesonlib.is_windows():
+        trial = detect_windows_arch(compilers)
+    elif mesonlib.is_freebsd() or mesonlib.is_netbsd() or mesonlib.is_openbsd() or mesonlib.is_qnx() or mesonlib.is_aix():
+        trial = platform.processor().lower()
+    else:
+        trial = platform.machine().lower()
+    if trial.startswith('i') and trial.endswith('86'):
+        trial = 'x86'
+    elif trial == 'bepc':
+        trial = 'x86'
+    elif trial == 'arm64':
+        trial = 'aarch64'
+    elif trial.startswith('aarch64'):
+        # This can be `aarch64_be`
+        trial = 'aarch64'
+    elif trial.startswith('arm') or trial.startswith('earm'):
+        trial = 'arm'
+    elif trial.startswith(('powerpc64', 'ppc64')):
+        trial = 'ppc64'
+    elif trial.startswith(('powerpc', 'ppc')) or trial in {'macppc', 'power macintosh'}:
+        trial = 'ppc'
+    elif trial in {'amd64', 'x64', 'i86pc'}:
+        trial = 'x86_64'
+    elif trial in {'sun4u', 'sun4v'}:
+        trial = 'sparc64'
+    elif trial.startswith('mips'):
+        if '64' not in trial:
+            trial = 'mips'
+        else:
+            trial = 'mips64'
+    elif trial in {'ip30', 'ip35'}:
+        trial = 'mips64'
+
+    # On Linux (and maybe others) there can be any mixture of 32/64 bit code in
+    # the kernel, Python, system, 32-bit chroot on 64-bit host, etc. The only
+    # reliable way to know is to check the compiler defines.
+    if trial == 'x86_64':
+        if any_compiler_has_define(compilers, '__i386__'):
+            trial = 'x86'
+    elif trial == 'aarch64':
+        if any_compiler_has_define(compilers, '__arm__'):
+            trial = 'arm'
+    # Add more quirks here as bugs are reported. Keep in sync with detect_cpu()
+    # below.
+    elif trial == 'parisc64':
+        # ATM there is no 64 bit userland for PA-RISC. Thus always
+        # report it as 32 bit for simplicity.
+        trial = 'parisc'
+    elif trial == 'ppc':
+        # AIX always returns powerpc, check here for 64-bit
+        if any_compiler_has_define(compilers, '__64BIT__'):
+            trial = 'ppc64'
+
+    if trial not in known_cpu_families:
+        mlog.warning(f'Unknown CPU family {trial!r}, please report this at '
+                     'https://github.com/mesonbuild/meson/issues/new with the '
+                     'output of `uname -a` and `cat /proc/cpuinfo`')
+
+    return trial
+
+def detect_cpu(compilers: CompilersDict) -> str:
+    if mesonlib.is_windows():
+        trial = detect_windows_arch(compilers)
+    elif mesonlib.is_freebsd() or mesonlib.is_netbsd() or mesonlib.is_openbsd() or mesonlib.is_aix():
+        trial = platform.processor().lower()
+    else:
+        trial = platform.machine().lower()
+
+    if trial in {'amd64', 'x64', 'i86pc'}:
+        trial = 'x86_64'
+    if trial == 'x86_64':
+        # Same check as above for cpu_family
+        if any_compiler_has_define(compilers, '__i386__'):
+            trial = 'i686' # All 64 bit cpus have at least this level of x86 support.
+    elif trial.startswith('aarch64') or trial.startswith('arm64'):
+        # Same check as above for cpu_family
+        if any_compiler_has_define(compilers, '__arm__'):
+            trial = 'arm'
+        else:
+            # for aarch64_be
+            trial = 'aarch64'
+    elif trial.startswith('earm'):
+        trial = 'arm'
+    elif trial == 'e2k':
+        # Make more precise CPU detection for Elbrus platform.
+        trial = platform.processor().lower()
+    elif trial.startswith('mips'):
+        if '64' not in trial:
+            trial = 'mips'
+        else:
+            trial = 'mips64'
+    elif trial == 'ppc':
+        # AIX always returns powerpc, check here for 64-bit
+        if any_compiler_has_define(compilers, '__64BIT__'):
+            trial = 'ppc64'
+
+    # Add more quirks here as bugs are reported. Keep in sync with
+    # detect_cpu_family() above.
+    return trial
+
+def detect_system() -> str:
+    if sys.platform == 'cygwin':
+        return 'cygwin'
+    return platform.system().lower()
+
+def detect_msys2_arch() -> T.Optional[str]:
+    return os.environ.get('MSYSTEM_CARCH', None)
+
+def detect_machine_info(compilers: T.Optional[CompilersDict] = None) -> MachineInfo:
+    """Detect the machine we're running on
+
+    If compilers are not provided, we cannot know as much. None out those
+    fields to avoid accidentally depending on partial knowledge. The
+    underlying ''detect_*'' method can be called to explicitly use the
+    partial information.
+    """
+    return MachineInfo(
+        detect_system(),
+        detect_cpu_family(compilers) if compilers is not None else None,
+        detect_cpu(compilers) if compilers is not None else None,
+        sys.byteorder)
+
+# TODO make this compare two `MachineInfo`s purely. How important is the
+# `detect_cpu_family({})` distinction? It is the one impediment to that.
+def machine_info_can_run(machine_info: MachineInfo):
+    """Whether we can run binaries for this machine on the current machine.
+
+    Can almost always run 32-bit binaries on 64-bit natively if the host
+    and build systems are the same. We don't pass any compilers to
+    detect_cpu_family() here because we always want to know the OS
+    architecture, not what the compiler environment tells us.
+    """
+    if machine_info.system != detect_system():
+        return False
+    true_build_cpu_family = detect_cpu_family({})
+    return \
+        (machine_info.cpu_family == true_build_cpu_family) or \
+        ((true_build_cpu_family == 'x86_64') and (machine_info.cpu_family == 'x86')) or \
+        ((true_build_cpu_family == 'aarch64') and (machine_info.cpu_family == 'arm'))
+
+class Environment:
+    private_dir = 'meson-private'
+    log_dir = 'meson-logs'
+    info_dir = 'meson-info'
+
+    def __init__(self, source_dir: T.Optional[str], build_dir: T.Optional[str], options: 'argparse.Namespace') -> None:
+        self.source_dir = source_dir
+        self.build_dir = build_dir
+        # Do not try to create build directories when build_dir is none.
+        # This reduced mode is used by the --buildoptions introspector
+        if build_dir is not None:
+            self.scratch_dir = os.path.join(build_dir, Environment.private_dir)
+            self.log_dir = os.path.join(build_dir, Environment.log_dir)
+            self.info_dir = os.path.join(build_dir, Environment.info_dir)
+            os.makedirs(self.scratch_dir, exist_ok=True)
+            os.makedirs(self.log_dir, exist_ok=True)
+            os.makedirs(self.info_dir, exist_ok=True)
+            try:
+                self.coredata = coredata.load(self.get_build_dir())  # type: coredata.CoreData
+                self.first_invocation = False
+            except FileNotFoundError:
+                self.create_new_coredata(options)
+            except coredata.MesonVersionMismatchException as e:
+                # This is routine, but tell the user the update happened
+                mlog.log('Regenerating configuration from scratch:', str(e))
+                coredata.read_cmd_line_file(self.build_dir, options)
+                self.create_new_coredata(options)
+            except MesonException as e:
+                # If we stored previous command line options, we can recover from
+                # a broken/outdated coredata.
+                if os.path.isfile(coredata.get_cmd_line_file(self.build_dir)):
+                    mlog.warning('Regenerating configuration from scratch.')
+                    mlog.log('Reason:', mlog.red(str(e)))
+                    coredata.read_cmd_line_file(self.build_dir, options)
+                    self.create_new_coredata(options)
+                else:
+                    raise e
+        else:
+            # Just create a fresh coredata in this case
+            self.scratch_dir = ''
+            self.create_new_coredata(options)
+
+        ## locally bind some unfrozen configuration
+
+        # Stores machine infos, the only *three* machine one because we have a
+        # target machine info on for the user (Meson never cares about the
+        # target machine.)
+        machines: PerThreeMachineDefaultable[MachineInfo] = PerThreeMachineDefaultable()
+
+        # Similar to coredata.compilers, but lower level in that there is no
+        # meta data, only names/paths.
+        binaries = PerMachineDefaultable()  # type: PerMachineDefaultable[BinaryTable]
+
+        # Misc other properties about each machine.
+        properties = PerMachineDefaultable()  # type: PerMachineDefaultable[Properties]
+
+        # CMake toolchain variables
+        cmakevars = PerMachineDefaultable()  # type: PerMachineDefaultable[CMakeVariables]
+
+        ## Setup build machine defaults
+
+        # Will be fully initialized later using compilers later.
+        machines.build = detect_machine_info()
+
+        # Just uses hard-coded defaults and environment variables. Might be
+        # overwritten by a native file.
+        binaries.build = BinaryTable()
+        properties.build = Properties()
+
+        # Options with the key parsed into an OptionKey type.
+        #
+        # Note that order matters because of 'buildtype', if it is after
+        # 'optimization' and 'debug' keys, it override them.
+        self.options: T.MutableMapping[OptionKey, T.Union[str, T.List[str]]] = collections.OrderedDict()
+
+        ## Read in native file(s) to override build machine configuration
+
+        if self.coredata.config_files is not None:
+            config = coredata.parse_machine_files(self.coredata.config_files)
+            binaries.build = BinaryTable(config.get('binaries', {}))
+            properties.build = Properties(config.get('properties', {}))
+            cmakevars.build = CMakeVariables(config.get('cmake', {}))
+            self._load_machine_file_options(
+                config, properties.build,
+                MachineChoice.BUILD if self.coredata.cross_files else MachineChoice.HOST)
+
+        ## Read in cross file(s) to override host machine configuration
+
+        if self.coredata.cross_files:
+            config = coredata.parse_machine_files(self.coredata.cross_files)
+            properties.host = Properties(config.get('properties', {}))
+            binaries.host = BinaryTable(config.get('binaries', {}))
+            cmakevars.host = CMakeVariables(config.get('cmake', {}))
+            if 'host_machine' in config:
+                machines.host = MachineInfo.from_literal(config['host_machine'])
+            if 'target_machine' in config:
+                machines.target = MachineInfo.from_literal(config['target_machine'])
+            # Keep only per machine options from the native file. The cross
+            # file takes precedence over all other options.
+            for key, value in list(self.options.items()):
+                if self.coredata.is_per_machine_option(key):
+                    self.options[key.as_build()] = value
+            self._load_machine_file_options(config, properties.host, MachineChoice.HOST)
+
+        ## "freeze" now initialized configuration, and "save" to the class.
+
+        self.machines = machines.default_missing()
+        self.binaries = binaries.default_missing()
+        self.properties = properties.default_missing()
+        self.cmakevars = cmakevars.default_missing()
+
+        # Command line options override those from cross/native files
+        self.options.update(options.cmd_line_options)
+
+        # Take default value from env if not set in cross/native files or command line.
+        self._set_default_options_from_env()
+        self._set_default_binaries_from_env()
+        self._set_default_properties_from_env()
+
+        # Warn if the user is using two different ways of setting build-type
+        # options that override each other
+        bt = OptionKey('buildtype')
+        db = OptionKey('debug')
+        op = OptionKey('optimization')
+        if bt in self.options and (db in self.options or op in self.options):
+            mlog.warning('Recommend using either -Dbuildtype or -Doptimization + -Ddebug. '
+                         'Using both is redundant since they override each other. '
+                         'See: https://mesonbuild.com/Builtin-options.html#build-type-options')
+
+        exe_wrapper = self.lookup_binary_entry(MachineChoice.HOST, 'exe_wrapper')
+        if exe_wrapper is not None:
+            self.exe_wrapper = ExternalProgram.from_bin_list(self, MachineChoice.HOST, 'exe_wrapper')
+        else:
+            self.exe_wrapper = None
+
+        self.default_cmake = ['cmake']
+        self.default_pkgconfig = ['pkg-config']
+        self.wrap_resolver: T.Optional['Resolver'] = None
+
+    def _load_machine_file_options(self, config: 'ConfigParser', properties: Properties, machine: MachineChoice) -> None:
+        """Read the contents of a Machine file and put it in the options store."""
+
+        # Look for any options in the deprecated paths section, warn about
+        # those, then assign them. They will be overwritten by the ones in the
+        # "built-in options" section if they're in both sections.
+        paths = config.get('paths')
+        if paths:
+            mlog.deprecation('The [paths] section is deprecated, use the [built-in options] section instead.')
+            for k, v in paths.items():
+                self.options[OptionKey.from_string(k).evolve(machine=machine)] = v
+
+        # Next look for compiler options in the "properties" section, this is
+        # also deprecated, and these will also be overwritten by the "built-in
+        # options" section. We need to remove these from this section, as well.
+        deprecated_properties: T.Set[str] = set()
+        for lang in compilers.all_languages:
+            deprecated_properties.add(lang + '_args')
+            deprecated_properties.add(lang + '_link_args')
+        for k, v in properties.properties.copy().items():
+            if k in deprecated_properties:
+                mlog.deprecation(f'{k} in the [properties] section of the machine file is deprecated, use the [built-in options] section.')
+                self.options[OptionKey.from_string(k).evolve(machine=machine)] = v
+                del properties.properties[k]
+
+        for section, values in config.items():
+            if ':' in section:
+                subproject, section = section.split(':')
+            else:
+                subproject = ''
+            if section == 'built-in options':
+                for k, v in values.items():
+                    key = OptionKey.from_string(k)
+                    # If we're in the cross file, and there is a `build.foo` warn about that. Later we'll remove it.
+                    if machine is MachineChoice.HOST and key.machine is not machine:
+                        mlog.deprecation('Setting build machine options in cross files, please use a native file instead, this will be removed in meson 0.60', once=True)
+                    if key.subproject:
+                        raise MesonException('Do not set subproject options in [built-in options] section, use [subproject:built-in options] instead.')
+                    self.options[key.evolve(subproject=subproject, machine=machine)] = v
+            elif section == 'project options' and machine is MachineChoice.HOST:
+                # Project options are only for the host machine, we don't want
+                # to read these from the native file
+                for k, v in values.items():
+                    # Project options are always for the host machine
+                    key = OptionKey.from_string(k)
+                    if key.subproject:
+                        raise MesonException('Do not set subproject options in [built-in options] section, use [subproject:built-in options] instead.')
+                    self.options[key.evolve(subproject=subproject)] = v
+
+    def _set_default_options_from_env(self) -> None:
+        opts: T.List[T.Tuple[str, str]] = (
+            [(v, f'{k}_args') for k, v in compilers.compilers.CFLAGS_MAPPING.items()] +
+            [
+                ('PKG_CONFIG_PATH', 'pkg_config_path'),
+                ('CMAKE_PREFIX_PATH', 'cmake_prefix_path'),
+                ('LDFLAGS', 'ldflags'),
+                ('CPPFLAGS', 'cppflags'),
+            ]
+        )
+
+        env_opts: T.DefaultDict[OptionKey, T.List[str]] = collections.defaultdict(list)
+
+        for (evar, keyname), for_machine in itertools.product(opts, MachineChoice):
+            p_env = _get_env_var(for_machine, self.is_cross_build(), evar)
+            if p_env is not None:
+                # these may contain duplicates, which must be removed, else
+                # a duplicates-in-array-option warning arises.
+                if keyname == 'cmake_prefix_path':
+                    if self.machines[for_machine].is_windows():
+                        # Cannot split on ':' on Windows because its in the drive letter
+                        _p_env = p_env.split(os.pathsep)
+                    else:
+                        # https://github.com/mesonbuild/meson/issues/7294
+                        _p_env = re.split(r':|;', p_env)
+                    p_list = list(mesonlib.OrderedSet(_p_env))
+                elif keyname == 'pkg_config_path':
+                    p_list = list(mesonlib.OrderedSet(p_env.split(os.pathsep)))
+                else:
+                    p_list = split_args(p_env)
+                p_list = [e for e in p_list if e]  # filter out any empty elements
+
+                # Take env vars only on first invocation, if the env changes when
+                # reconfiguring it gets ignored.
+                # FIXME: We should remember if we took the value from env to warn
+                # if it changes on future invocations.
+                if self.first_invocation:
+                    if keyname == 'ldflags':
+                        key = OptionKey('link_args', machine=for_machine, lang='c')  # needs a language to initialize properly
+                        for lang in compilers.compilers.LANGUAGES_USING_LDFLAGS:
+                            key = key.evolve(lang=lang)
+                            env_opts[key].extend(p_list)
+                    elif keyname == 'cppflags':
+                        key = OptionKey('env_args', machine=for_machine, lang='c')
+                        for lang in compilers.compilers.LANGUAGES_USING_CPPFLAGS:
+                            key = key.evolve(lang=lang)
+                            env_opts[key].extend(p_list)
+                    else:
+                        key = OptionKey.from_string(keyname).evolve(machine=for_machine)
+                        if evar in compilers.compilers.CFLAGS_MAPPING.values():
+                            # If this is an environment variable, we have to
+                            # store it separately until the compiler is
+                            # instantiated, as we don't know whether the
+                            # compiler will want to use these arguments at link
+                            # time and compile time (instead of just at compile
+                            # time) until we're instantiating that `Compiler`
+                            # object. This is required so that passing
+                            # `-Dc_args=` on the command line and `$CFLAGS`
+                            # have subtely different behavior. `$CFLAGS` will be
+                            # added to the linker command line if the compiler
+                            # acts as a linker driver, `-Dc_args` will not.
+                            #
+                            # We still use the original key as the base here, as
+                            # we want to inherit the machine and the compiler
+                            # language
+                            key = key.evolve('env_args')
+                        env_opts[key].extend(p_list)
+
+        # Only store options that are not already in self.options,
+        # otherwise we'd override the machine files
+        for k, v in env_opts.items():
+            if k not in self.options:
+                self.options[k] = v
+
+    def _set_default_binaries_from_env(self) -> None:
+        """Set default binaries from the environment.
+
+        For example, pkg-config can be set via PKG_CONFIG, or in the machine
+        file. We want to set the default to the env variable.
+        """
+        opts = itertools.chain(envconfig.DEPRECATED_ENV_PROG_MAP.items(),
+                               envconfig.ENV_VAR_PROG_MAP.items())
+
+        for (name, evar), for_machine in itertools.product(opts, MachineChoice):
+            p_env = _get_env_var(for_machine, self.is_cross_build(), evar)
+            if p_env is not None:
+                self.binaries[for_machine].binaries.setdefault(name, mesonlib.split_args(p_env))
+
+    def _set_default_properties_from_env(self) -> None:
+        """Properties which can also be set from the environment."""
+        # name, evar, split
+        opts: T.List[T.Tuple[str, T.List[str], bool]] = [
+            ('boost_includedir', ['BOOST_INCLUDEDIR'], False),
+            ('boost_librarydir', ['BOOST_LIBRARYDIR'], False),
+            ('boost_root', ['BOOST_ROOT', 'BOOSTROOT'], True),
+            ('java_home', ['JAVA_HOME'], False),
+        ]
+
+        for (name, evars, split), for_machine in itertools.product(opts, MachineChoice):
+            for evar in evars:
+                p_env = _get_env_var(for_machine, self.is_cross_build(), evar)
+                if p_env is not None:
+                    if split:
+                        self.properties[for_machine].properties.setdefault(name, p_env.split(os.pathsep))
+                    else:
+                        self.properties[for_machine].properties.setdefault(name, p_env)
+                    break
+
+    def create_new_coredata(self, options: 'argparse.Namespace') -> None:
+        # WARNING: Don't use any values from coredata in __init__. It gets
+        # re-initialized with project options by the interpreter during
+        # build file parsing.
+        # meson_command is used by the regenchecker script, which runs meson
+        self.coredata = coredata.CoreData(options, self.scratch_dir, mesonlib.get_meson_command())
+        self.first_invocation = True
+
+    def is_cross_build(self, when_building_for: MachineChoice = MachineChoice.HOST) -> bool:
+        return self.coredata.is_cross_build(when_building_for)
+
+    def dump_coredata(self) -> str:
+        return coredata.save(self.coredata, self.get_build_dir())
+
+    def get_log_dir(self) -> str:
+        return self.log_dir
+
+    def get_coredata(self) -> coredata.CoreData:
+        return self.coredata
+
+    @staticmethod
+    def get_build_command(unbuffered: bool = False) -> T.List[str]:
+        cmd = mesonlib.get_meson_command()
+        if cmd is None:
+            raise MesonBugException('No command?')
+        cmd = cmd.copy()
+        if unbuffered and 'python' in os.path.basename(cmd[0]):
+            cmd.insert(1, '-u')
+        return cmd
+
+    def is_header(self, fname: 'mesonlib.FileOrString') -> bool:
+        return is_header(fname)
+
+    def is_source(self, fname: 'mesonlib.FileOrString') -> bool:
+        return is_source(fname)
+
+    def is_assembly(self, fname: 'mesonlib.FileOrString') -> bool:
+        return is_assembly(fname)
+
+    def is_llvm_ir(self, fname: 'mesonlib.FileOrString') -> bool:
+        return is_llvm_ir(fname)
+
+    def is_object(self, fname: 'mesonlib.FileOrString') -> bool:
+        return is_object(fname)
+
+    @lru_cache(maxsize=None)
+    def is_library(self, fname):
+        return is_library(fname)
+
+    def lookup_binary_entry(self, for_machine: MachineChoice, name: str) -> T.Optional[T.List[str]]:
+        return self.binaries[for_machine].lookup_entry(name)
+
+    def get_scratch_dir(self) -> str:
+        return self.scratch_dir
+
+    def get_source_dir(self) -> str:
+        return self.source_dir
+
+    def get_build_dir(self) -> str:
+        return self.build_dir
+
+    def get_import_lib_dir(self) -> str:
+        "Install dir for the import library (library used for linking)"
+        return self.get_libdir()
+
+    def get_shared_module_dir(self) -> str:
+        "Install dir for shared modules that are loaded at runtime"
+        return self.get_libdir()
+
+    def get_shared_lib_dir(self) -> str:
+        "Install dir for the shared library"
+        m = self.machines.host
+        # Windows has no RPATH or similar, so DLLs must be next to EXEs.
+        if m.is_windows() or m.is_cygwin():
+            return self.get_bindir()
+        return self.get_libdir()
+
+    def get_jar_dir(self) -> str:
+        """Install dir for JAR files"""
+        return f"{self.get_datadir()}/java"
+
+    def get_static_lib_dir(self) -> str:
+        "Install dir for the static library"
+        return self.get_libdir()
+
+    def get_prefix(self) -> str:
+        return self.coredata.get_option(OptionKey('prefix'))
+
+    def get_libdir(self) -> str:
+        return self.coredata.get_option(OptionKey('libdir'))
+
+    def get_libexecdir(self) -> str:
+        return self.coredata.get_option(OptionKey('libexecdir'))
+
+    def get_bindir(self) -> str:
+        return self.coredata.get_option(OptionKey('bindir'))
+
+    def get_includedir(self) -> str:
+        return self.coredata.get_option(OptionKey('includedir'))
+
+    def get_mandir(self) -> str:
+        return self.coredata.get_option(OptionKey('mandir'))
+
+    def get_datadir(self) -> str:
+        return self.coredata.get_option(OptionKey('datadir'))
+
+    def get_compiler_system_dirs(self, for_machine: MachineChoice):
+        for comp in self.coredata.compilers[for_machine].values():
+            if comp.id == 'clang':
+                index = 1
+                break
+            elif comp.id == 'gcc':
+                index = 2
+                break
+        else:
+            # This option is only supported by gcc and clang. If we don't get a
+            # GCC or Clang compiler return and empty list.
+            return []
+
+        p, out, _ = Popen_safe(comp.get_exelist() + ['-print-search-dirs'])
+        if p.returncode != 0:
+            raise mesonlib.MesonException('Could not calculate system search dirs')
+        out = out.split('\n')[index].lstrip('libraries: =').split(':')
+        return [os.path.normpath(p) for p in out]
+
+    def need_exe_wrapper(self, for_machine: MachineChoice = MachineChoice.HOST):
+        value = self.properties[for_machine].get('needs_exe_wrapper', None)
+        if value is not None:
+            return value
+        return not machine_info_can_run(self.machines[for_machine])
+
+    def get_exe_wrapper(self) -> T.Optional[ExternalProgram]:
+        if not self.need_exe_wrapper():
+            return None
+        return self.exe_wrapper