# Copyright 2013-2021 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 .base import ExternalDependency, DependencyException, DependencyTypeName from ..mesonlib import is_windows, MesonException, OptionKey, PerMachine, stringlistify, extract_as_list from ..mesondata import mesondata from ..cmake import CMakeExecutor, CMakeTraceParser, CMakeException, CMakeToolchain, CMakeExecScope, check_cmake_args, CMakeTarget from .. import mlog from pathlib import Path import functools import re import os import shutil import textwrap import typing as T if T.TYPE_CHECKING: from ..environment import Environment from ..envconfig import MachineInfo class CMakeInfo(T.NamedTuple): module_paths: T.List[str] cmake_root: str archs: T.List[str] common_paths: T.List[str] class CMakeDependency(ExternalDependency): # The class's copy of the CMake path. Avoids having to search for it # multiple times in the same Meson invocation. class_cmakeinfo: PerMachine[T.Optional[CMakeInfo]] = PerMachine(None, None) # Version string for the minimum CMake version class_cmake_version = '>=3.4' # CMake generators to try (empty for no generator) class_cmake_generators = ['', 'Ninja', 'Unix Makefiles', 'Visual Studio 10 2010'] class_working_generator: T.Optional[str] = None def _gen_exception(self, msg: str) -> DependencyException: return DependencyException(f'Dependency {self.name} not found: {msg}') def _main_cmake_file(self) -> str: return 'CMakeLists.txt' def _extra_cmake_opts(self) -> T.List[str]: return [] def _map_module_list(self, modules: T.List[T.Tuple[str, bool]], components: T.List[T.Tuple[str, bool]]) -> T.List[T.Tuple[str, bool]]: # Map the input module list to something else # This function will only be executed AFTER the initial CMake # interpreter pass has completed. Thus variables defined in the # CMakeLists.txt can be accessed here. # # Both the modules and components inputs contain the original lists. return modules def _map_component_list(self, modules: T.List[T.Tuple[str, bool]], components: T.List[T.Tuple[str, bool]]) -> T.List[T.Tuple[str, bool]]: # Map the input components list to something else. This # function will be executed BEFORE the initial CMake interpreter # pass. Thus variables from the CMakeLists.txt can NOT be accessed. # # Both the modules and components inputs contain the original lists. return components def _original_module_name(self, module: str) -> str: # Reverse the module mapping done by _map_module_list for # one module return module def __init__(self, name: str, environment: 'Environment', kwargs: T.Dict[str, T.Any], language: T.Optional[str] = None) -> None: # Gather a list of all languages to support self.language_list = [] # type: T.List[str] if language is None: compilers = None if kwargs.get('native', False): compilers = environment.coredata.compilers.build else: compilers = environment.coredata.compilers.host candidates = ['c', 'cpp', 'fortran', 'objc', 'objcxx'] self.language_list += [x for x in candidates if x in compilers] else: self.language_list += [language] # Add additional languages if required if 'fortran' in self.language_list: self.language_list += ['c'] # Ensure that the list is unique self.language_list = list(set(self.language_list)) super().__init__(DependencyTypeName('cmake'), environment, kwargs, language=language) self.name = name self.is_libtool = False # Store a copy of the CMake path on the object itself so it is # stored in the pickled coredata and recovered. self.cmakebin: T.Optional[CMakeExecutor] = None self.cmakeinfo: T.Optional[CMakeInfo] = None # Where all CMake "build dirs" are located self.cmake_root_dir = environment.scratch_dir # T.List of successfully found modules self.found_modules: T.List[str] = [] # Initialize with None before the first return to avoid # AttributeError exceptions in derived classes self.traceparser: T.Optional[CMakeTraceParser] = None # TODO further evaluate always using MachineChoice.BUILD self.cmakebin = CMakeExecutor(environment, CMakeDependency.class_cmake_version, self.for_machine, silent=self.silent) if not self.cmakebin.found(): self.cmakebin = None msg = f'CMake binary for machine {self.for_machine} not found. Giving up.' if self.required: raise DependencyException(msg) mlog.debug(msg) return # Setup the trace parser self.traceparser = CMakeTraceParser(self.cmakebin.version(), self._get_build_dir()) cm_args = stringlistify(extract_as_list(kwargs, 'cmake_args')) cm_args = check_cmake_args(cm_args) if CMakeDependency.class_cmakeinfo[self.for_machine] is None: CMakeDependency.class_cmakeinfo[self.for_machine] = self._get_cmake_info(cm_args) self.cmakeinfo = CMakeDependency.class_cmakeinfo[self.for_machine] if self.cmakeinfo is None: raise self._gen_exception('Unable to obtain CMake system information') package_version = kwargs.get('cmake_package_version', '') if not isinstance(package_version, str): raise DependencyException('Keyword "cmake_package_version" must be a string.') components = [(x, True) for x in stringlistify(extract_as_list(kwargs, 'components'))] modules = [(x, True) for x in stringlistify(extract_as_list(kwargs, 'modules'))] modules += [(x, False) for x in stringlistify(extract_as_list(kwargs, 'optional_modules'))] cm_path = stringlistify(extract_as_list(kwargs, 'cmake_module_path')) cm_path = [x if os.path.isabs(x) else os.path.join(environment.get_source_dir(), x) for x in cm_path] if cm_path: cm_args.append('-DCMAKE_MODULE_PATH=' + ';'.join(cm_path)) if not self._preliminary_find_check(name, cm_path, self.cmakebin.get_cmake_prefix_paths(), environment.machines[self.for_machine]): mlog.debug('Preliminary CMake check failed. Aborting.') return self._detect_dep(name, package_version, modules, components, cm_args) def __repr__(self) -> str: return f'<{self.__class__.__name__} {self.name}: {self.is_found} {self.version_reqs}>' def _get_cmake_info(self, cm_args: T.List[str]) -> T.Optional[CMakeInfo]: mlog.debug("Extracting basic cmake information") # Try different CMake generators since specifying no generator may fail # in cygwin for some reason gen_list = [] # First try the last working generator if CMakeDependency.class_working_generator is not None: gen_list += [CMakeDependency.class_working_generator] gen_list += CMakeDependency.class_cmake_generators temp_parser = CMakeTraceParser(self.cmakebin.version(), self._get_build_dir()) toolchain = CMakeToolchain(self.cmakebin, self.env, self.for_machine, CMakeExecScope.DEPENDENCY, self._get_build_dir()) toolchain.write() for i in gen_list: mlog.debug('Try CMake generator: {}'.format(i if len(i) > 0 else 'auto')) # Prepare options cmake_opts = temp_parser.trace_args() + toolchain.get_cmake_args() + ['.'] cmake_opts += cm_args if len(i) > 0: cmake_opts = ['-G', i] + cmake_opts # Run CMake ret1, out1, err1 = self._call_cmake(cmake_opts, 'CMakePathInfo.txt') # Current generator was successful if ret1 == 0: CMakeDependency.class_working_generator = i break mlog.debug(f'CMake failed to gather system information for generator {i} with error code {ret1}') mlog.debug(f'OUT:\n{out1}\n\n\nERR:\n{err1}\n\n') # Check if any generator succeeded if ret1 != 0: return None try: temp_parser.parse(err1) except MesonException: return None def process_paths(l: T.List[str]) -> T.Set[str]: if is_windows(): # Cannot split on ':' on Windows because its in the drive letter tmp = [x.split(os.pathsep) for x in l] else: # https://github.com/mesonbuild/meson/issues/7294 tmp = [re.split(r':|;', x) for x in l] flattened = [x for sublist in tmp for x in sublist] return set(flattened) # Extract the variables and sanity check them root_paths_set = process_paths(temp_parser.get_cmake_var('MESON_FIND_ROOT_PATH')) root_paths_set.update(process_paths(temp_parser.get_cmake_var('MESON_CMAKE_SYSROOT'))) root_paths = sorted(root_paths_set) root_paths = [x for x in root_paths if os.path.isdir(x)] module_paths_set = process_paths(temp_parser.get_cmake_var('MESON_PATHS_LIST')) rooted_paths: T.List[str] = [] for j in [Path(x) for x in root_paths]: for p in [Path(x) for x in module_paths_set]: rooted_paths.append(str(j / p.relative_to(p.anchor))) module_paths = sorted(module_paths_set.union(rooted_paths)) module_paths = [x for x in module_paths if os.path.isdir(x)] archs = temp_parser.get_cmake_var('MESON_ARCH_LIST') common_paths = ['lib', 'lib32', 'lib64', 'libx32', 'share'] for i in archs: common_paths += [os.path.join('lib', i)] res = CMakeInfo( module_paths=module_paths, cmake_root=temp_parser.get_cmake_var('MESON_CMAKE_ROOT')[0], archs=archs, common_paths=common_paths, ) mlog.debug(f' -- Module search paths: {res.module_paths}') mlog.debug(f' -- CMake root: {res.cmake_root}') mlog.debug(f' -- CMake architectures: {res.archs}') mlog.debug(f' -- CMake lib search paths: {res.common_paths}') return res @staticmethod @functools.lru_cache(maxsize=None) def _cached_listdir(path: str) -> T.Tuple[T.Tuple[str, str], ...]: try: return tuple((x, str(x).lower()) for x in os.listdir(path)) except OSError: return tuple() @staticmethod @functools.lru_cache(maxsize=None) def _cached_isdir(path: str) -> bool: try: return os.path.isdir(path) except OSError: return False def _preliminary_find_check(self, name: str, module_path: T.List[str], prefix_path: T.List[str], machine: 'MachineInfo') -> bool: lname = str(name).lower() # Checks , /cmake, /CMake def find_module(path: str) -> bool: for i in [path, os.path.join(path, 'cmake'), os.path.join(path, 'CMake')]: if not self._cached_isdir(i): continue # Check the directory case insensitive content = self._cached_listdir(i) candidates = ['Find{}.cmake', '{}Config.cmake', '{}-config.cmake'] candidates = [x.format(name).lower() for x in candidates] if any([x[1] in candidates for x in content]): return True return False # Search in /(lib/|lib*|share) for cmake files def search_lib_dirs(path: str) -> bool: for i in [os.path.join(path, x) for x in self.cmakeinfo.common_paths]: if not self._cached_isdir(i): continue # Check /(lib/|lib*|share)/cmake/*/ cm_dir = os.path.join(i, 'cmake') if self._cached_isdir(cm_dir): content = self._cached_listdir(cm_dir) content = tuple(x for x in content if x[1].startswith(lname)) for k in content: if find_module(os.path.join(cm_dir, k[0])): return True # /(lib/|lib*|share)/*/ # /(lib/|lib*|share)/*/(cmake|CMake)/ content = self._cached_listdir(i) content = tuple(x for x in content if x[1].startswith(lname)) for k in content: if find_module(os.path.join(i, k[0])): return True return False # Check the user provided and system module paths for i in module_path + [os.path.join(self.cmakeinfo.cmake_root, 'Modules')]: if find_module(i): return True # Check the user provided prefix paths for i in prefix_path: if search_lib_dirs(i): return True # Check PATH system_env = [] # type: T.List[str] for i in os.environ.get('PATH', '').split(os.pathsep): if i.endswith('/bin') or i.endswith('\\bin'): i = i[:-4] if i.endswith('/sbin') or i.endswith('\\sbin'): i = i[:-5] system_env += [i] # Check the system paths for i in self.cmakeinfo.module_paths + system_env: if find_module(i): return True if search_lib_dirs(i): return True content = self._cached_listdir(i) content = tuple(x for x in content if x[1].startswith(lname)) for k in content: if search_lib_dirs(os.path.join(i, k[0])): return True # Mac framework support if machine.is_darwin(): for j in [f'{lname}.framework', f'{lname}.app']: for k in content: if k[1] != j: continue if find_module(os.path.join(i, k[0], 'Resources')) or find_module(os.path.join(i, k[0], 'Version')): return True # Check the environment path env_path = os.environ.get(f'{name}_DIR') if env_path and find_module(env_path): return True return False def _detect_dep(self, name: str, package_version: str, modules: T.List[T.Tuple[str, bool]], components: T.List[T.Tuple[str, bool]], args: T.List[str]) -> None: # Detect a dependency with CMake using the '--find-package' mode # and the trace output (stderr) # # When the trace output is enabled CMake prints all functions with # parameters to stderr as they are executed. Since CMake 3.4.0 # variables ("${VAR}") are also replaced in the trace output. mlog.debug('\nDetermining dependency {!r} with CMake executable ' '{!r}'.format(name, self.cmakebin.executable_path())) # Try different CMake generators since specifying no generator may fail # in cygwin for some reason gen_list = [] # First try the last working generator if CMakeDependency.class_working_generator is not None: gen_list += [CMakeDependency.class_working_generator] gen_list += CMakeDependency.class_cmake_generators # Map the components comp_mapped = self._map_component_list(modules, components) toolchain = CMakeToolchain(self.cmakebin, self.env, self.for_machine, CMakeExecScope.DEPENDENCY, self._get_build_dir()) toolchain.write() for i in gen_list: mlog.debug('Try CMake generator: {}'.format(i if len(i) > 0 else 'auto')) # Prepare options cmake_opts = [] cmake_opts += [f'-DNAME={name}'] cmake_opts += ['-DARCHS={}'.format(';'.join(self.cmakeinfo.archs))] cmake_opts += [f'-DVERSION={package_version}'] cmake_opts += ['-DCOMPS={}'.format(';'.join([x[0] for x in comp_mapped]))] cmake_opts += args cmake_opts += self.traceparser.trace_args() cmake_opts += toolchain.get_cmake_args() cmake_opts += self._extra_cmake_opts() cmake_opts += ['.'] if len(i) > 0: cmake_opts = ['-G', i] + cmake_opts # Run CMake ret1, out1, err1 = self._call_cmake(cmake_opts, self._main_cmake_file()) # Current generator was successful if ret1 == 0: CMakeDependency.class_working_generator = i break mlog.debug(f'CMake failed for generator {i} and package {name} with error code {ret1}') mlog.debug(f'OUT:\n{out1}\n\n\nERR:\n{err1}\n\n') # Check if any generator succeeded if ret1 != 0: return try: self.traceparser.parse(err1) except CMakeException as e: e2 = self._gen_exception(str(e)) if self.required: raise else: self.compile_args = [] self.link_args = [] self.is_found = False self.reason = e2 return # Whether the package is found or not is always stored in PACKAGE_FOUND self.is_found = self.traceparser.var_to_bool('PACKAGE_FOUND') if not self.is_found: return # Try to detect the version vers_raw = self.traceparser.get_cmake_var('PACKAGE_VERSION') if len(vers_raw) > 0: self.version = vers_raw[0] self.version.strip('"\' ') # Post-process module list. Used in derived classes to modify the # module list (append prepend a string, etc.). modules = self._map_module_list(modules, components) autodetected_module_list = False # Try guessing a CMake target if none is provided if len(modules) == 0: for i in self.traceparser.targets: tg = i.lower() lname = name.lower() if f'{lname}::{lname}' == tg or lname == tg.replace('::', ''): mlog.debug(f'Guessed CMake target \'{i}\'') modules = [(i, True)] autodetected_module_list = True break # Failed to guess a target --> try the old-style method if len(modules) == 0: # Warn when there might be matching imported targets but no automatic match was used partial_modules: T.List[CMakeTarget] = [] for k, v in self.traceparser.targets.items(): tg = k.lower() lname = name.lower() if tg.startswith(f'{lname}::'): partial_modules += [v] if partial_modules: mlog.warning(textwrap.dedent(f'''\ Could not find and exact match for the CMake dependency {name}. However, Meson found the following partial matches: {[x.name for x in partial_modules]} Using imported is recommended, since this approach is less error prone and better supported by Meson. Consider explicitly specifying one of these in the dependency call with: dependency('{name}', modules: ['{name}::', ...]) Meson will now continue to use the old-style {name}_LIBRARIES CMake variables to extract the dependency information since no explicit target is currently specified. ''')) mlog.debug('More info for the partial match targets:') for tgt in partial_modules: mlog.debug(tgt) incDirs = [x for x in self.traceparser.get_cmake_var('PACKAGE_INCLUDE_DIRS') if x] defs = [x for x in self.traceparser.get_cmake_var('PACKAGE_DEFINITIONS') if x] libs = [x for x in self.traceparser.get_cmake_var('PACKAGE_LIBRARIES') if x] # Try to use old style variables if no module is specified if len(libs) > 0: self.compile_args = list(map(lambda x: f'-I{x}', incDirs)) + defs self.link_args = libs mlog.debug(f'using old-style CMake variables for dependency {name}') mlog.debug(f'Include Dirs: {incDirs}') mlog.debug(f'Compiler Definitions: {defs}') mlog.debug(f'Libraries: {libs}') return # Even the old-style approach failed. Nothing else we can do here self.is_found = False raise self._gen_exception('CMake: failed to guess a CMake target for {}.\n' 'Try to explicitly specify one or more targets with the "modules" property.\n' 'Valid targets are:\n{}'.format(name, list(self.traceparser.targets.keys()))) # Set dependencies with CMake targets # recognise arguments we should pass directly to the linker reg_is_lib = re.compile(r'^(-l[a-zA-Z0-9_]+|-pthread|-delayload:[a-zA-Z0-9_\.]+|[a-zA-Z0-9_]+\.lib)$') reg_is_maybe_bare_lib = re.compile(r'^[a-zA-Z0-9_]+$') processed_targets = [] incDirs = [] compileDefinitions = [] compileOptions = [] libraries = [] for i, required in modules: if i not in self.traceparser.targets: if not required: mlog.warning('CMake: T.Optional module', mlog.bold(self._original_module_name(i)), 'for', mlog.bold(name), 'was not found') continue raise self._gen_exception('CMake: invalid module {} for {}.\n' 'Try to explicitly specify one or more targets with the "modules" property.\n' 'Valid targets are:\n{}'.format(self._original_module_name(i), name, list(self.traceparser.targets.keys()))) targets = [i] if not autodetected_module_list: self.found_modules += [i] while len(targets) > 0: curr = targets.pop(0) # Skip already processed targets if curr in processed_targets: continue tgt = self.traceparser.targets[curr] cfgs = [] cfg = '' otherDeps = [] mlog.debug(tgt) if 'INTERFACE_INCLUDE_DIRECTORIES' in tgt.properties: incDirs += [x for x in tgt.properties['INTERFACE_INCLUDE_DIRECTORIES'] if x] if 'INTERFACE_COMPILE_DEFINITIONS' in tgt.properties: compileDefinitions += ['-D' + re.sub('^-D', '', x) for x in tgt.properties['INTERFACE_COMPILE_DEFINITIONS'] if x] if 'INTERFACE_COMPILE_OPTIONS' in tgt.properties: compileOptions += [x for x in tgt.properties['INTERFACE_COMPILE_OPTIONS'] if x] if 'IMPORTED_CONFIGURATIONS' in tgt.properties: cfgs = [x for x in tgt.properties['IMPORTED_CONFIGURATIONS'] if x] cfg = cfgs[0] if OptionKey('b_vscrt') in self.env.coredata.options: is_debug = self.env.coredata.get_option(OptionKey('buildtype')) == 'debug' if self.env.coredata.options[OptionKey('b_vscrt')].value in {'mdd', 'mtd'}: is_debug = True else: # Don't directly assign to is_debug to make mypy happy debug_opt = self.env.coredata.get_option(OptionKey('debug')) assert isinstance(debug_opt, bool) is_debug = debug_opt if is_debug: if 'DEBUG' in cfgs: cfg = 'DEBUG' elif 'RELEASE' in cfgs: cfg = 'RELEASE' else: if 'RELEASE' in cfgs: cfg = 'RELEASE' if f'IMPORTED_IMPLIB_{cfg}' in tgt.properties: libraries += [x for x in tgt.properties[f'IMPORTED_IMPLIB_{cfg}'] if x] elif 'IMPORTED_IMPLIB' in tgt.properties: libraries += [x for x in tgt.properties['IMPORTED_IMPLIB'] if x] elif f'IMPORTED_LOCATION_{cfg}' in tgt.properties: libraries += [x for x in tgt.properties[f'IMPORTED_LOCATION_{cfg}'] if x] elif 'IMPORTED_LOCATION' in tgt.properties: libraries += [x for x in tgt.properties['IMPORTED_LOCATION'] if x] if 'INTERFACE_LINK_LIBRARIES' in tgt.properties: otherDeps += [x for x in tgt.properties['INTERFACE_LINK_LIBRARIES'] if x] if f'IMPORTED_LINK_DEPENDENT_LIBRARIES_{cfg}' in tgt.properties: otherDeps += [x for x in tgt.properties[f'IMPORTED_LINK_DEPENDENT_LIBRARIES_{cfg}'] if x] elif 'IMPORTED_LINK_DEPENDENT_LIBRARIES' in tgt.properties: otherDeps += [x for x in tgt.properties['IMPORTED_LINK_DEPENDENT_LIBRARIES'] if x] for j in otherDeps: if j in self.traceparser.targets: targets += [j] elif reg_is_lib.match(j): libraries += [j] elif os.path.isabs(j) and os.path.exists(j): libraries += [j] elif self.env.machines.build.is_windows() and reg_is_maybe_bare_lib.match(j): # On Windows, CMake library dependencies can be passed as bare library names, # e.g. 'version' should translate into 'version.lib'. CMake brute-forces a # combination of prefix/suffix combinations to find the right library, however # as we do not have a compiler environment available to us, we cannot do the # same, but must assume any bare argument passed which is not also a CMake # target must be a system library we should try to link against libraries += [f"{j}.lib"] else: mlog.warning('CMake: Dependency', mlog.bold(j), 'for', mlog.bold(name), 'target', mlog.bold(self._original_module_name(curr)), 'was not found') processed_targets += [curr] # Make sure all elements in the lists are unique and sorted incDirs = sorted(set(incDirs)) compileDefinitions = sorted(set(compileDefinitions)) compileOptions = sorted(set(compileOptions)) libraries = sorted(set(libraries)) mlog.debug(f'Include Dirs: {incDirs}') mlog.debug(f'Compiler Definitions: {compileDefinitions}') mlog.debug(f'Compiler Options: {compileOptions}') mlog.debug(f'Libraries: {libraries}') self.compile_args = compileOptions + compileDefinitions + [f'-I{x}' for x in incDirs] self.link_args = libraries def _get_build_dir(self) -> Path: build_dir = Path(self.cmake_root_dir) / f'cmake_{self.name}' build_dir.mkdir(parents=True, exist_ok=True) return build_dir def _setup_cmake_dir(self, cmake_file: str) -> Path: # Setup the CMake build environment and return the "build" directory build_dir = self._get_build_dir() # Remove old CMake cache so we can try out multiple generators cmake_cache = build_dir / 'CMakeCache.txt' cmake_files = build_dir / 'CMakeFiles' if cmake_cache.exists(): cmake_cache.unlink() shutil.rmtree(cmake_files.as_posix(), ignore_errors=True) # Insert language parameters into the CMakeLists.txt and write new CMakeLists.txt cmake_txt = mesondata['dependencies/data/' + cmake_file].data # In general, some Fortran CMake find_package() also require C language enabled, # even if nothing from C is directly used. An easy Fortran example that fails # without C language is # find_package(Threads) # To make this general to # any other language that might need this, we use a list for all # languages and expand in the cmake Project(... LANGUAGES ...) statement. from ..cmake import language_map cmake_language = [language_map[x] for x in self.language_list if x in language_map] if not cmake_language: cmake_language += ['NONE'] cmake_txt = textwrap.dedent(""" cmake_minimum_required(VERSION ${{CMAKE_VERSION}}) project(MesonTemp LANGUAGES {}) """).format(' '.join(cmake_language)) + cmake_txt cm_file = build_dir / 'CMakeLists.txt' cm_file.write_text(cmake_txt, encoding='utf-8') mlog.cmd_ci_include(cm_file.absolute().as_posix()) return build_dir def _call_cmake(self, args: T.List[str], cmake_file: str, env: T.Optional[T.Dict[str, str]] = None) -> T.Tuple[int, T.Optional[str], T.Optional[str]]: build_dir = self._setup_cmake_dir(cmake_file) return self.cmakebin.call(args, build_dir, env=env) def log_tried(self) -> str: return self.type_name def log_details(self) -> str: modules = [self._original_module_name(x) for x in self.found_modules] modules = sorted(set(modules)) if modules: return 'modules: ' + ', '.join(modules) return '' def get_variable(self, *, cmake: T.Optional[str] = None, pkgconfig: T.Optional[str] = None, configtool: T.Optional[str] = None, internal: T.Optional[str] = None, default_value: T.Optional[str] = None, pkgconfig_define: T.Optional[T.List[str]] = None) -> T.Union[str, T.List[str]]: if cmake and self.traceparser is not None: try: v = self.traceparser.vars[cmake] except KeyError: pass else: if len(v) == 1: return v[0] elif v: return v if default_value is not None: return default_value raise DependencyException(f'Could not get cmake variable and no default provided for {self!r}')