lgtm: Fix Module imported with `import` and `import from`

6 files changed, 84 insertions, 88 deletions

diff --git a/mesonbuild/compilers/compilers.py b/mesonbuild/compilers/compilers.py
index 52a2788..3400c48 100644
--- a/mesonbuild/compilers/compilers.py
+++ b/mesonbuild/compilers/compilers.py
@@ -13,8 +13,7 @@
 # limitations under the License.
 
 import contextlib, os.path, re, tempfile
-import typing
-from typing import Optional, Tuple, List
+from typing import TYPE_CHECKING, Optional, Tuple, List, Union
 
 from ..linkers import StaticLinker, GnuLikeDynamicLinkerMixin, SolarisDynamicLinker
 from .. import coredata
@@ -28,7 +27,7 @@ from ..envconfig import (
     Properties,
 )
 
-if typing.TYPE_CHECKING:
+if TYPE_CHECKING:
     from ..coredata import OptionDictType
     from ..envconfig import MachineInfo
     from ..environment import Environment
@@ -522,7 +521,7 @@ class CompilerArgs(list):
             return True
         return False
 
-    def to_native(self, copy: bool = False) -> typing.List[str]:
+    def to_native(self, copy: bool = False) -> List[str]:
         # Check if we need to add --start/end-group for circular dependencies
         # between static libraries, and for recursively searching for symbols
         # needed by static libraries that are provided by object files or
@@ -669,10 +668,10 @@ class Compiler:
     # manually searched.
     internal_libs = ()
 
-    LINKER_PREFIX = None  # type: typing.Union[None, str, typing.List[str]]
+    LINKER_PREFIX = None  # type: Union[None, str, List[str]]
 
     def __init__(self, exelist, version, for_machine: MachineChoice, info: 'MachineInfo',
-                 linker: typing.Optional['DynamicLinker'] = None, **kwargs):
+                 linker: Optional['DynamicLinker'] = None, **kwargs):
         if isinstance(exelist, str):
             self.exelist = [exelist]
         elif isinstance(exelist, list):
@@ -747,10 +746,10 @@ class Compiler:
     def get_exelist(self):
         return self.exelist[:]
 
-    def get_linker_exelist(self) -> typing.List[str]:
+    def get_linker_exelist(self) -> List[str]:
         return self.linker.get_exelist()
 
-    def get_linker_output_args(self, outputname: str) -> typing.List[str]:
+    def get_linker_output_args(self, outputname: str) -> List[str]:
         return self.linker.get_output_args(outputname)
 
     def get_builtin_define(self, *args, **kwargs):
@@ -793,10 +792,10 @@ class Compiler:
         """
         return self.get_language() in languages_using_ldflags
 
-    def get_linker_args_from_envvars(self) -> typing.List[str]:
+    def get_linker_args_from_envvars(self) -> List[str]:
         return self.linker.get_args_from_envvars()
 
-    def get_args_from_envvars(self) -> typing.Tuple[typing.List[str], typing.List[str]]:
+    def get_args_from_envvars(self) -> Tuple[List[str], List[str]]:
         """
         Returns a tuple of (compile_flags, link_flags) for the specified language
         from the inherited environment
@@ -813,8 +812,8 @@ class Compiler:
         if lang not in cflags_mapping:
             return [], []
 
-        compile_flags = []  # type: typing.List[str]
-        link_flags = []     # type: typing.List[str]
+        compile_flags = []  # type: List[str]
+        link_flags = []     # type: List[str]
 
         env_compile_flags = os.environ.get(cflags_mapping[lang])
         log_var(cflags_mapping[lang], env_compile_flags)
@@ -885,7 +884,7 @@ class Compiler:
     def get_option_compile_args(self, options):
         return []
 
-    def get_option_link_args(self, options: 'OptionDictType') -> typing.List[str]:
+    def get_option_link_args(self, options: 'OptionDictType') -> List[str]:
         return self.linker.get_option_args(options)
 
     def check_header(self, *args, **kwargs) -> Tuple[bool, bool]:
@@ -921,7 +920,7 @@ class Compiler:
         return args[:]
 
     @classmethod
-    def native_args_to_unix(cls, args: typing.List[str]) -> typing.List[str]:
+    def native_args_to_unix(cls, args: List[str]) -> List[str]:
         "Always returns a copy that can be independently mutated"
         return args[:]
 
@@ -939,7 +938,7 @@ class Compiler:
             'Language {} does not support has_multi_arguments.'.format(
                 self.get_display_language()))
 
-    def has_multi_link_arguments(self, args: typing.List[str], env: 'Environment') -> Tuple[bool, bool]:
+    def has_multi_link_arguments(self, args: List[str], env: 'Environment') -> Tuple[bool, bool]:
         return self.linker.has_multi_arguments(args, env)
 
     def _get_compile_output(self, dirname, mode):
@@ -1053,22 +1052,22 @@ class Compiler:
     def get_compile_debugfile_args(self, rel_obj, **kwargs):
         return []
 
-    def get_link_debugfile_args(self, targetfile: str) -> typing.List[str]:
+    def get_link_debugfile_args(self, targetfile: str) -> List[str]:
         return self.linker.get_debugfile_args(targetfile)
 
-    def get_std_shared_lib_link_args(self) -> typing.List[str]:
+    def get_std_shared_lib_link_args(self) -> List[str]:
         return self.linker.get_std_shared_lib_args()
 
-    def get_std_shared_module_link_args(self, options: 'OptionDictType') -> typing.List[str]:
+    def get_std_shared_module_link_args(self, options: 'OptionDictType') -> List[str]:
         return self.linker.get_std_shared_module_args(options)
 
-    def get_link_whole_for(self, args: typing.List[str]) -> typing.List[str]:
+    def get_link_whole_for(self, args: List[str]) -> List[str]:
         return self.linker.get_link_whole_for(args)
 
-    def get_allow_undefined_link_args(self) -> typing.List[str]:
+    def get_allow_undefined_link_args(self) -> List[str]:
         return self.linker.get_allow_undefined_args()
 
-    def no_undefined_link_args(self) -> typing.List[str]:
+    def no_undefined_link_args(self) -> List[str]:
         return self.linker.no_undefined_args()
 
     # Compiler arguments needed to enable the given instruction set.
@@ -1079,7 +1078,7 @@ class Compiler:
 
     def build_rpath_args(self, env: 'Environment', build_dir: str, from_dir: str,
                          rpath_paths: str, build_rpath: str,
-                         install_rpath: str) -> typing.List[str]:
+                         install_rpath: str) -> List[str]:
         return self.linker.build_rpath_args(
             env, build_dir, from_dir, rpath_paths, build_rpath, install_rpath)
 
@@ -1110,7 +1109,7 @@ class Compiler:
         m = 'Language {} does not support position-independent executable'
         raise EnvironmentException(m.format(self.get_display_language()))
 
-    def get_pie_link_args(self) -> typing.List[str]:
+    def get_pie_link_args(self) -> List[str]:
         return self.linker.get_pie_args()
 
     def get_argument_syntax(self):
@@ -1132,7 +1131,7 @@ class Compiler:
         raise EnvironmentException(
             '%s does not support get_profile_use_args ' % self.get_id())
 
-    def get_undefined_link_args(self) -> typing.List[str]:
+    def get_undefined_link_args(self) -> List[str]:
         return self.linker.get_undefined_link_args()
 
     def remove_linkerlike_args(self, args):
@@ -1150,21 +1149,21 @@ class Compiler:
     def sanitizer_link_args(self, value: str) -> List[str]:
         return self.linker.sanitizer_args(value)
 
-    def get_asneeded_args(self) -> typing.List[str]:
+    def get_asneeded_args(self) -> List[str]:
         return self.linker.get_asneeded_args()
 
-    def bitcode_args(self) -> typing.List[str]:
+    def bitcode_args(self) -> List[str]:
         return self.linker.bitcode_args()
 
-    def get_linker_debug_crt_args(self) -> typing.List[str]:
+    def get_linker_debug_crt_args(self) -> List[str]:
         return self.linker.get_debug_crt_args()
 
-    def get_buildtype_linker_args(self, buildtype: str) -> typing.List[str]:
+    def get_buildtype_linker_args(self, buildtype: str) -> List[str]:
         return self.linker.get_buildtype_args(buildtype)
 
     def get_soname_args(self, env: 'Environment', prefix: str, shlib_name: str,
-                        suffix: str, soversion: str, darwin_versions: typing.Tuple[str, str],
-                        is_shared_module: bool) -> typing.List[str]:
+                        suffix: str, soversion: str, darwin_versions: Tuple[str, str],
+                        is_shared_module: bool) -> List[str]:
         return self.linker.get_soname_args(
             env, prefix, shlib_name, suffix, soversion,
             darwin_versions, is_shared_module)
diff --git a/mesonbuild/compilers/fortran.py b/mesonbuild/compilers/fortran.py
index fdd6204..f66ff38 100644
--- a/mesonbuild/compilers/fortran.py
+++ b/mesonbuild/compilers/fortran.py
@@ -13,9 +13,8 @@
 # limitations under the License.
 
 from pathlib import Path
-from typing import List
+from typing import TYPE_CHECKING, List
 import subprocess, os
-import typing
 
 from .. import coredata
 from .compilers import (
@@ -36,7 +35,7 @@ from mesonbuild.mesonlib import (
     version_compare, EnvironmentException, MesonException, MachineChoice, LibType
 )
 
-if typing.TYPE_CHECKING:
+if TYPE_CHECKING:
     from ..envconfig import MachineInfo
 
 
@@ -192,7 +191,7 @@ class GnuFortranCompiler(GnuCompiler, FortranCompiler):
                                                              'none')})
         return opts
 
-    def get_option_compile_args(self, options) -> typing.List[str]:
+    def get_option_compile_args(self, options) -> List[str]:
         args = []
         std = options['fortran_std']
         if std.value != 'none':
@@ -298,7 +297,7 @@ class IntelFortranCompiler(IntelGnuLikeCompiler, FortranCompiler):
                                                              'none')})
         return opts
 
-    def get_option_compile_args(self, options) -> typing.List[str]:
+    def get_option_compile_args(self, options) -> List[str]:
         args = []
         std = options['fortran_std']
         stds = {'legacy': 'none', 'f95': 'f95', 'f2003': 'f03', 'f2008': 'f08', 'f2018': 'f18'}
@@ -318,7 +317,7 @@ class IntelFortranCompiler(IntelGnuLikeCompiler, FortranCompiler):
     def language_stdlib_only_link_flags(self):
         return ['-lifcore', '-limf']
 
-    def get_dependency_gen_args(self, outtarget: str, outfile: str) -> typing.List[str]:
+    def get_dependency_gen_args(self, outtarget: str, outfile: str) -> List[str]:
         return ['-gen-dep=' + outtarget, '-gen-depformat=make']
 
 
@@ -348,7 +347,7 @@ class IntelClFortranCompiler(IntelVisualStudioLikeCompiler, FortranCompiler):
                                                              'none')})
         return opts
 
-    def get_option_compile_args(self, options) -> typing.List[str]:
+    def get_option_compile_args(self, options) -> List[str]:
         args = []
         std = options['fortran_std']
         stds = {'legacy': 'none', 'f95': 'f95', 'f2003': 'f03', 'f2008': 'f08', 'f2018': 'f18'}
diff --git a/mesonbuild/coredata.py b/mesonbuild/coredata.py
index a5898f1..cc9ca20 100644
--- a/mesonbuild/coredata.py
+++ b/mesonbuild/coredata.py
@@ -27,16 +27,16 @@ import ast
 import argparse
 import configparser
 from typing import (
-    Any, Dict, Generic, Iterable, List, Optional, Type, TypeVar, Union
+    Any, Dict, Generic, Iterable, Iterator, List, MutableMapping, Optional, Tuple, Type, TypeVar, Union,
+    TYPE_CHECKING,
 )
-import typing
 import enum
 import shlex
 
-if typing.TYPE_CHECKING:
+if TYPE_CHECKING:
     from . import dependencies
 
-    OptionDictType = typing.Dict[str, 'UserOption[Any]']
+    OptionDictType = Dict[str, 'UserOption[Any]']
 
 version = '0.52.999'
 backendlist = ['ninja', 'vs', 'vs2010', 'vs2015', 'vs2017', 'vs2019', 'xcode']
@@ -231,9 +231,9 @@ def load_configs(filenames: List[str]) -> configparser.ConfigParser:
     return config
 
 
-if typing.TYPE_CHECKING:
-    CacheKeyType = typing.Tuple[typing.Tuple[typing.Any, ...], ...]
-    SubCacheKeyType = typing.Tuple[typing.Any, ...]
+if TYPE_CHECKING:
+    CacheKeyType = Tuple[Tuple[Any, ...], ...]
+    SubCacheKeyType = Tuple[Any, ...]
 
 
 class DependencyCacheType(enum.Enum):
@@ -257,7 +257,7 @@ class DependencySubCache:
 
     def __init__(self, type_: DependencyCacheType):
         self.types = [type_]
-        self.__cache = {}  # type: typing.Dict[SubCacheKeyType, dependencies.Dependency]
+        self.__cache = {}  # type: Dict[SubCacheKeyType, dependencies.Dependency]
 
     def __getitem__(self, key: 'SubCacheKeyType') -> 'dependencies.Dependency':
         return self.__cache[key]
@@ -268,7 +268,7 @@ class DependencySubCache:
     def __contains__(self, key: 'SubCacheKeyType') -> bool:
         return key in self.__cache
 
-    def values(self) -> typing.Iterable['dependencies.Dependency']:
+    def values(self) -> Iterable['dependencies.Dependency']:
         return self.__cache.values()
 
 
@@ -280,12 +280,12 @@ class DependencyCache:
     successfully lookup by providing a simple get/put interface.
     """
 
-    def __init__(self, builtins_per_machine: PerMachine[typing.Dict[str, UserOption[typing.Any]]], for_machine: MachineChoice):
-        self.__cache = OrderedDict()  # type: typing.MutableMapping[CacheKeyType, DependencySubCache]
+    def __init__(self, builtins_per_machine: PerMachine[Dict[str, UserOption[Any]]], for_machine: MachineChoice):
+        self.__cache = OrderedDict()  # type: MutableMapping[CacheKeyType, DependencySubCache]
         self.__builtins_per_machine = builtins_per_machine
         self.__for_machine = for_machine
 
-    def __calculate_subkey(self, type_: DependencyCacheType) -> typing.Tuple[typing.Any, ...]:
+    def __calculate_subkey(self, type_: DependencyCacheType) -> Tuple[Any, ...]:
         if type_ is DependencyCacheType.PKG_CONFIG:
             return tuple(self.__builtins_per_machine[self.__for_machine]['pkg_config_path'].value)
         elif type_ is DependencyCacheType.CMAKE:
@@ -293,7 +293,7 @@ class DependencyCache:
         assert type_ is DependencyCacheType.OTHER, 'Someone forgot to update subkey calculations for a new type'
         return tuple()
 
-    def __iter__(self) -> typing.Iterator['CacheKeyType']:
+    def __iter__(self) -> Iterator['CacheKeyType']:
         return self.keys()
 
     def put(self, key: 'CacheKeyType', dep: 'dependencies.Dependency') -> None:
@@ -303,7 +303,7 @@ class DependencyCache:
         subkey = self.__calculate_subkey(t)
         self.__cache[key][subkey] = dep
 
-    def get(self, key: 'CacheKeyType') -> typing.Optional['dependencies.Dependency']:
+    def get(self, key: 'CacheKeyType') -> Optional['dependencies.Dependency']:
         """Get a value from the cache.
 
         If there is no cache entry then None will be returned.
@@ -321,14 +321,14 @@ class DependencyCache:
                 pass
         return None
 
-    def values(self) -> typing.Iterator['dependencies.Dependency']:
+    def values(self) -> Iterator['dependencies.Dependency']:
         for c in self.__cache.values():
             yield from c.values()
 
-    def keys(self) -> typing.Iterator['CacheKeyType']:
+    def keys(self) -> Iterator['CacheKeyType']:
         return iter(self.__cache.keys())
 
-    def items(self) -> typing.Iterator[typing.Tuple['CacheKeyType', typing.List['dependencies.Dependency']]]:
+    def items(self) -> Iterator[Tuple['CacheKeyType', List['dependencies.Dependency']]]:
         for k, v in self.__cache.items():
             vs = []
             for t in v.types:
@@ -390,9 +390,9 @@ class CoreData:
         if not filenames:
             return []
 
-        found_invalid = []  # type: typing.List[str]
-        missing = []        # type: typing.List[str]
-        real = []           # type: typing.List[str]
+        found_invalid = []  # type: List[str]
+        missing = []        # type: List[str]
+        real = []           # type: List[str]
         for i, f in enumerate(filenames):
             f = os.path.expanduser(os.path.expandvars(f))
             if os.path.exists(f):
diff --git a/mesonbuild/dependencies/base.py b/mesonbuild/dependencies/base.py
index 06ea1c3..a151915 100644
--- a/mesonbuild/dependencies/base.py
+++ b/mesonbuild/dependencies/base.py
@@ -23,8 +23,7 @@ import shlex
 import shutil
 import textwrap
 import platform
-import typing
-from typing import Any, Dict, List, Tuple
+from typing import Any, Dict, List, Optional, Tuple, Type, Union
 from enum import Enum
 from pathlib import Path, PurePath
 
@@ -208,8 +207,8 @@ class Dependency:
         """
         raise RuntimeError('Unreachable code in partial_dependency called')
 
-    def _add_sub_dependency(self, dep_type: typing.Type['Dependency'], env: Environment,
-                            kwargs: typing.Dict[str, typing.Any], *,
+    def _add_sub_dependency(self, dep_type: Type['Dependency'], env: Environment,
+                            kwargs: Dict[str, Any], *,
                             method: DependencyMethods = DependencyMethods.AUTO) -> None:
         """Add an internal dependency of of the given type.
 
@@ -222,14 +221,14 @@ class Dependency:
         kwargs['method'] = method
         self.ext_deps.append(dep_type(env, kwargs))
 
-    def get_variable(self, *, cmake: typing.Optional[str] = None, pkgconfig: typing.Optional[str] = None,
-                     configtool: typing.Optional[str] = None, default_value: typing.Optional[str] = None,
-                     pkgconfig_define: typing.Optional[typing.List[str]] = None) -> typing.Union[str, typing.List[str]]:
+    def get_variable(self, *, cmake: Optional[str] = None, pkgconfig: Optional[str] = None,
+                     configtool: Optional[str] = None, default_value: Optional[str] = None,
+                     pkgconfig_define: Optional[List[str]] = None) -> Union[str, List[str]]:
         if default_value is not None:
             return default_value
         raise DependencyException('No default provided for dependency {!r}, which is not pkg-config, cmake, or config-tool based.'.format(self))
 
-    def generate_system_dependency(self, include_type: str) -> typing.Type['Dependency']:
+    def generate_system_dependency(self, include_type: str) -> Type['Dependency']:
         new_dep = copy.deepcopy(self)
         new_dep.include_type = self._process_include_type_kw({'include_type': include_type})
         return new_dep
@@ -550,9 +549,9 @@ class ConfigToolDependency(ExternalDependency):
     def log_tried(self):
         return self.type_name
 
-    def get_variable(self, *, cmake: typing.Optional[str] = None, pkgconfig: typing.Optional[str] = None,
-                     configtool: typing.Optional[str] = None, default_value: typing.Optional[str] = None,
-                     pkgconfig_define: typing.Optional[typing.List[str]] = None) -> typing.Union[str, typing.List[str]]:
+    def get_variable(self, *, cmake: Optional[str] = None, pkgconfig: Optional[str] = None,
+                     configtool: Optional[str] = None, default_value: Optional[str] = None,
+                     pkgconfig_define: Optional[List[str]] = None) -> Union[str, List[str]]:
         if configtool:
             # In the not required case '' (empty string) will be returned if the
             # variable is not found. Since '' is a valid value to return we
@@ -984,9 +983,9 @@ class PkgConfigDependency(ExternalDependency):
     def log_tried(self):
         return self.type_name
 
-    def get_variable(self, *, cmake: typing.Optional[str] = None, pkgconfig: typing.Optional[str] = None,
-                     configtool: typing.Optional[str] = None, default_value: typing.Optional[str] = None,
-                     pkgconfig_define: typing.Optional[typing.List[str]] = None) -> typing.Union[str, typing.List[str]]:
+    def get_variable(self, *, cmake: Optional[str] = None, pkgconfig: Optional[str] = None,
+                     configtool: Optional[str] = None, default_value: Optional[str] = None,
+                     pkgconfig_define: Optional[List[str]] = None) -> Union[str, List[str]]:
         if pkgconfig:
             kwargs = {}
             if default_value is not None:
@@ -1479,9 +1478,9 @@ class CMakeDependency(ExternalDependency):
             return 'modules: ' + ', '.join(modules)
         return ''
 
-    def get_variable(self, *, cmake: typing.Optional[str] = None, pkgconfig: typing.Optional[str] = None,
-                     configtool: typing.Optional[str] = None, default_value: typing.Optional[str] = None,
-                     pkgconfig_define: typing.Optional[typing.List[str]] = None) -> typing.Union[str, typing.List[str]]:
+    def get_variable(self, *, cmake: Optional[str] = None, pkgconfig: Optional[str] = None,
+                     configtool: Optional[str] = None, default_value: Optional[str] = None,
+                     pkgconfig_define: Optional[List[str]] = None) -> Union[str, List[str]]:
         if cmake:
             try:
                 v = self.traceparser.vars[cmake]
@@ -1696,8 +1695,8 @@ class ExternalProgram:
     # An 'ExternalProgram' always runs on the build machine
     for_machine = MachineChoice.BUILD
 
-    def __init__(self, name: str, command: typing.Optional[typing.List[str]] = None,
-                 silent: bool = False, search_dir: typing.Optional[str] = None):
+    def __init__(self, name: str, command: Optional[List[str]] = None,
+                 silent: bool = False, search_dir: Optional[str] = None):
         self.name = name
         if command is not None:
             self.command = listify(command)
diff --git a/mesonbuild/mlog.py b/mesonbuild/mlog.py
index ace47f4..c779a58 100644
--- a/mesonbuild/mlog.py
+++ b/mesonbuild/mlog.py
@@ -18,8 +18,7 @@ import sys
 import time
 import platform
 from contextlib import contextmanager
-import typing
-from typing import Any, Generator, List, Optional, Sequence, TextIO, Union
+from typing import Any, Generator, List, Optional, Sequence, TextIO, Union, cast
 from pathlib import Path
 
 """This is (mostly) a standalone module used to write logging
@@ -232,7 +231,7 @@ def _log_error(severity: str, *rargs: Union[str, AnsiDecorator], **kwargs: Any)
         location_str = get_error_location_string(location_file, location.lineno)
         # Unions are frankly awful, and we have to cast here to get mypy
         # to understand that the list concatenation is safe
-        location_list = typing.cast(List[Union[str, AnsiDecorator]], [location_str])
+        location_list = cast(List[Union[str, AnsiDecorator]], [location_str])
         args = location_list + args
 
     log(*args, **kwargs)
diff --git a/run_tests.py b/run_tests.py
index 504e6ac..33dc1be 100755
--- a/run_tests.py
+++ b/run_tests.py
@@ -26,7 +26,8 @@ from io import StringIO
 from enum import Enum
 from glob import glob
 from pathlib import Path
-import mesonbuild
+from mesonbuild import compilers
+from mesonbuild import dependencies
 from mesonbuild import mesonlib
 from mesonbuild import mesonmain
 from mesonbuild import mtest
@@ -95,7 +96,6 @@ class FakeCompilerOptions:
         self.value = []
 
 def get_fake_options(prefix=''):
-    import argparse
     opts = argparse.Namespace()
     opts.native_file = []
     opts.cross_file = None
@@ -135,7 +135,7 @@ def get_meson_script():
     running in-process (which is the default).
     '''
     # Is there a meson.py next to the mesonbuild currently in use?
-    mesonbuild_dir = Path(mesonbuild.__file__).resolve().parent.parent
+    mesonbuild_dir = Path(mesonmain.__file__).resolve().parent.parent
     meson_script = mesonbuild_dir / 'meson.py'
     if meson_script.is_file():
         return str(meson_script)
@@ -263,12 +263,12 @@ def run_mtest_inprocess(commandlist):
     return returncode, mystdout.getvalue(), mystderr.getvalue()
 
 def clear_meson_configure_class_caches():
-    mesonbuild.compilers.CCompiler.library_dirs_cache = {}
-    mesonbuild.compilers.CCompiler.program_dirs_cache = {}
-    mesonbuild.compilers.CCompiler.find_library_cache = {}
-    mesonbuild.compilers.CCompiler.find_framework_cache = {}
-    mesonbuild.dependencies.PkgConfigDependency.pkgbin_cache = {}
-    mesonbuild.dependencies.PkgConfigDependency.class_pkgbin = mesonlib.PerMachine(None, None)
+    compilers.CCompiler.library_dirs_cache = {}
+    compilers.CCompiler.program_dirs_cache = {}
+    compilers.CCompiler.find_library_cache = {}
+    compilers.CCompiler.find_framework_cache = {}
+    dependencies.PkgConfigDependency.pkgbin_cache = {}
+    dependencies.PkgConfigDependency.class_pkgbin = mesonlib.PerMachine(None, None)
 
 def run_configure_inprocess(commandlist, env=None):
     old_stdout = sys.stdout