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meson/mesonbuild/dependencies/cmake.py

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# 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, DependencyMethods
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
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 ..mesonlib import MachineInfo
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(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 = None
def _gen_exception(self, msg):
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, language: T.Optional[str] = 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__('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 = None
self.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 = []
# Initialize with None before the first return to avoid
# AttributeError exceptions in derived classes
self.traceparser = None # type: CMakeTraceParser
# 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):
s = '<{0} {1}: {2} {3}>'
return s.format(self.__class__.__name__, self.name, self.is_found,
self.version_reqs)
def _get_cmake_info(self, cm_args):
mlog.debug("Extracting basic cmake information")
res = {}
# 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
l = [x.split(os.pathsep) for x in l]
else:
# https://github.com/mesonbuild/meson/issues/7294
l = [re.split(r':|;', x) for x in l]
l = [x for sublist in l for x in sublist]
return set(l)
# Extract the variables and sanity check them
root_paths = process_paths(temp_parser.get_cmake_var('MESON_FIND_ROOT_PATH'))
root_paths.update(process_paths(temp_parser.get_cmake_var('MESON_CMAKE_SYSROOT')))
root_paths = sorted(root_paths)
root_paths = list(filter(lambda x: os.path.isdir(x), root_paths))
module_paths = process_paths(temp_parser.get_cmake_var('MESON_PATHS_LIST'))
rooted_paths = []
for j in [Path(x) for x in root_paths]:
for i in [Path(x) for x in module_paths]:
rooted_paths.append(str(j / i.relative_to(i.anchor)))
module_paths = sorted(module_paths.union(rooted_paths))
module_paths = list(filter(lambda x: os.path.isdir(x), module_paths))
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 = {
'module_paths': module_paths,
'cmake_root': temp_parser.get_cmake_var('MESON_CMAKE_ROOT')[0],
'archs': archs,
'common_paths': common_paths
}
mlog.debug(' -- Module search paths: {}'.format(res['module_paths']))
mlog.debug(' -- CMake root: {}'.format(res['cmake_root']))
mlog.debug(' -- CMake architectures: {}'.format(res['archs']))
mlog.debug(' -- CMake lib search paths: {}'.format(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 ()
@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 <path>, <path>/cmake, <path>/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 <path>/(lib/<arch>|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 <path>/(lib/<arch>|lib*|share)/cmake/<name>*/
cm_dir = os.path.join(i, 'cmake')
if self._cached_isdir(cm_dir):
content = self._cached_listdir(cm_dir)
content = list(filter(lambda x: x[1].startswith(lname), content))
for k in content:
if find_module(os.path.join(cm_dir, k[0])):
return True
# <path>/(lib/<arch>|lib*|share)/<name>*/
# <path>/(lib/<arch>|lib*|share)/<name>*/(cmake|CMake)/
content = self._cached_listdir(i)
content = list(filter(lambda x: x[1].startswith(lname), content))
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 = list(filter(lambda x: x[1].startswith(lname), content))
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 ['{}.framework', '{}.app']:
j = j.format(lname)
if j in content:
if find_module(os.path.join(i, j[0], 'Resources')) or find_module(os.path.join(i, j[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]):
# 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:
e = self._gen_exception(str(e))
if self.required:
raise
else:
self.compile_args = []
self.link_args = []
self.is_found = False
self.reason = e
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:
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:
is_debug = self.env.coredata.get_option(OptionKey('debug'))
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)
mlog.cmd_ci_include(cm_file.absolute().as_posix())
return build_dir
def _call_cmake(self, args, cmake_file: str, env=None):
build_dir = self._setup_cmake_dir(cmake_file)
return self.cmakebin.call(args, build_dir, env=env)
@staticmethod
def get_methods():
return [DependencyMethods.CMAKE]
def log_tried(self):
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}')