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meson/mesonbuild/dependencies/pkgconfig.py

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# SPDX-License-Identifier: Apache-2.0
# Copyright 2013-2021 The Meson development team
from __future__ import annotations
from pathlib import Path
from .base import ExternalDependency, DependencyException, sort_libpaths, DependencyTypeName
from ..mesonlib import EnvironmentVariables, OptionKey, OrderedSet, PerMachine, Popen_safe, Popen_safe_logged, MachineChoice, join_args
from ..programs import find_external_program, ExternalProgram
from .. import mlog
from pathlib import PurePath
from functools import lru_cache
import re
import os
import shlex
import typing as T
if T.TYPE_CHECKING:
from typing_extensions import Literal
from .._typing import ImmutableListProtocol
from ..environment import Environment
from ..utils.core import EnvironOrDict
from ..interpreter.type_checking import PkgConfigDefineType
class PkgConfigInterface:
'''Base class wrapping a pkg-config implementation'''
class_impl: PerMachine[T.Union[Literal[False], T.Optional[PkgConfigInterface]]] = PerMachine(False, False)
class_cli_impl: PerMachine[T.Union[Literal[False], T.Optional[PkgConfigCLI]]] = PerMachine(False, False)
@staticmethod
def instance(env: Environment, for_machine: MachineChoice, silent: bool) -> T.Optional[PkgConfigInterface]:
'''Return a pkg-config implementation singleton'''
for_machine = for_machine if env.is_cross_build() else MachineChoice.HOST
impl = PkgConfigInterface.class_impl[for_machine]
if impl is False:
impl = PkgConfigCLI(env, for_machine, silent)
if not impl.found():
impl = None
if not impl and not silent:
mlog.log('Found pkg-config:', mlog.red('NO'))
PkgConfigInterface.class_impl[for_machine] = impl
return impl
@staticmethod
def _cli(env: Environment, for_machine: MachineChoice, silent: bool = False) -> T.Optional[PkgConfigCLI]:
'''Return the CLI pkg-config implementation singleton
Even when we use another implementation internally, external tools might
still need the CLI implementation.
'''
for_machine = for_machine if env.is_cross_build() else MachineChoice.HOST
impl: T.Union[Literal[False], T.Optional[PkgConfigInterface]] # Help confused mypy
impl = PkgConfigInterface.instance(env, for_machine, silent)
if impl and not isinstance(impl, PkgConfigCLI):
impl = PkgConfigInterface.class_cli_impl[for_machine]
if impl is False:
impl = PkgConfigCLI(env, for_machine, silent)
if not impl.found():
impl = None
PkgConfigInterface.class_cli_impl[for_machine] = impl
return T.cast('T.Optional[PkgConfigCLI]', impl) # Trust me, mypy
@staticmethod
def get_env(env: Environment, for_machine: MachineChoice, uninstalled: bool = False) -> EnvironmentVariables:
cli = PkgConfigInterface._cli(env, for_machine)
return cli._get_env(uninstalled) if cli else EnvironmentVariables()
@staticmethod
def setup_env(environ: EnvironOrDict, env: Environment, for_machine: MachineChoice,
uninstalled: bool = False) -> EnvironOrDict:
cli = PkgConfigInterface._cli(env, for_machine)
return cli._setup_env(environ, uninstalled) if cli else environ
def __init__(self, env: Environment, for_machine: MachineChoice) -> None:
self.env = env
self.for_machine = for_machine
def found(self) -> bool:
'''Return whether pkg-config is supported'''
raise NotImplementedError
def version(self, name: str) -> T.Optional[str]:
'''Return module version or None if not found'''
raise NotImplementedError
def cflags(self, name: str, allow_system: bool = False,
define_variable: PkgConfigDefineType = None) -> ImmutableListProtocol[str]:
'''Return module cflags
@allow_system: If False, remove default system include paths
'''
raise NotImplementedError
def libs(self, name: str, static: bool = False, allow_system: bool = False,
define_variable: PkgConfigDefineType = None) -> ImmutableListProtocol[str]:
'''Return module libs
@static: If True, also include private libraries
@allow_system: If False, remove default system libraries search paths
'''
raise NotImplementedError
def variable(self, name: str, variable_name: str,
define_variable: PkgConfigDefineType) -> T.Optional[str]:
'''Return module variable or None if variable is not defined'''
raise NotImplementedError
def list_all(self) -> ImmutableListProtocol[str]:
'''Return all available pkg-config modules'''
raise NotImplementedError
class PkgConfigCLI(PkgConfigInterface):
'''pkg-config CLI implementation'''
def __init__(self, env: Environment, for_machine: MachineChoice, silent: bool) -> None:
super().__init__(env, for_machine)
self._detect_pkgbin()
if self.pkgbin and not silent:
mlog.log('Found pkg-config:', mlog.green('YES'), mlog.bold(f'({self.pkgbin.get_path()})'), mlog.blue(self.pkgbin_version))
def found(self) -> bool:
return bool(self.pkgbin)
@lru_cache(maxsize=None)
def version(self, name: str) -> T.Optional[str]:
mlog.debug(f'Determining dependency {name!r} with pkg-config executable {self.pkgbin.get_path()!r}')
ret, version, _ = self._call_pkgbin(['--modversion', name])
return version if ret == 0 else None
@staticmethod
def _define_variable_args(define_variable: PkgConfigDefineType) -> T.List[str]:
ret = []
if define_variable:
for pair in define_variable:
ret.append('--define-variable=' + '='.join(pair))
return ret
@lru_cache(maxsize=None)
def cflags(self, name: str, allow_system: bool = False,
define_variable: PkgConfigDefineType = None) -> ImmutableListProtocol[str]:
env = None
if allow_system:
env = os.environ.copy()
env['PKG_CONFIG_ALLOW_SYSTEM_CFLAGS'] = '1'
args: T.List[str] = []
args += self._define_variable_args(define_variable)
args += ['--cflags', name]
ret, out, err = self._call_pkgbin(args, env=env)
if ret != 0:
raise DependencyException(f'Could not generate cflags for {name}:\n{err}\n')
return self._split_args(out)
@lru_cache(maxsize=None)
def libs(self, name: str, static: bool = False, allow_system: bool = False,
define_variable: PkgConfigDefineType = None) -> ImmutableListProtocol[str]:
env = None
if allow_system:
env = os.environ.copy()
env['PKG_CONFIG_ALLOW_SYSTEM_LIBS'] = '1'
args: T.List[str] = []
args += self._define_variable_args(define_variable)
if static:
args.append('--static')
args += ['--libs', name]
ret, out, err = self._call_pkgbin(args, env=env)
if ret != 0:
raise DependencyException(f'Could not generate libs for {name}:\n{err}\n')
return self._split_args(out)
@lru_cache(maxsize=None)
def variable(self, name: str, variable_name: str,
define_variable: PkgConfigDefineType) -> T.Optional[str]:
args: T.List[str] = []
args += self._define_variable_args(define_variable)
args += ['--variable=' + variable_name, name]
ret, out, err = self._call_pkgbin(args)
if ret != 0:
raise DependencyException(f'Could not get variable for {name}:\n{err}\n')
variable = out.strip()
# pkg-config doesn't distinguish between empty and nonexistent variables
# use the variable list to check for variable existence
if not variable:
ret, out, _ = self._call_pkgbin(['--print-variables', name])
if not re.search(rf'^{variable_name}$', out, re.MULTILINE):
return None
mlog.debug(f'Got pkg-config variable {variable_name} : {variable}')
return variable
@lru_cache(maxsize=None)
def list_all(self) -> ImmutableListProtocol[str]:
ret, out, err = self._call_pkgbin(['--list-all'])
if ret != 0:
raise DependencyException(f'could not list modules:\n{err}\n')
return [i.split(' ', 1)[0] for i in out.splitlines()]
@staticmethod
def _split_args(cmd: str) -> T.List[str]:
# pkg-config paths follow Unix conventions, even on Windows; split the
# output using shlex.split rather than mesonlib.split_args
return shlex.split(cmd)
def _detect_pkgbin(self) -> None:
for potential_pkgbin in find_external_program(
self.env, self.for_machine, 'pkg-config', 'Pkg-config',
self.env.default_pkgconfig, allow_default_for_cross=False):
version_if_ok = self._check_pkgconfig(potential_pkgbin)
if version_if_ok:
self.pkgbin = potential_pkgbin
self.pkgbin_version = version_if_ok
return
self.pkgbin = None
def _check_pkgconfig(self, pkgbin: ExternalProgram) -> T.Optional[str]:
if not pkgbin.found():
mlog.log(f'Did not find pkg-config by name {pkgbin.name!r}')
return None
command_as_string = ' '.join(pkgbin.get_command())
try:
helptext = Popen_safe(pkgbin.get_command() + ['--help'])[1]
if 'Pure-Perl' in helptext:
mlog.log(f'Found pkg-config {command_as_string!r} but it is Strawberry Perl and thus broken. Ignoring...')
return None
p, out = Popen_safe(pkgbin.get_command() + ['--version'])[0:2]
if p.returncode != 0:
mlog.warning(f'Found pkg-config {command_as_string!r} but it failed when ran')
return None
except FileNotFoundError:
mlog.warning(f'We thought we found pkg-config {command_as_string!r} but now it\'s not there. How odd!')
return None
except PermissionError:
msg = f'Found pkg-config {command_as_string!r} but didn\'t have permissions to run it.'
if not self.env.machines.build.is_windows():
msg += '\n\nOn Unix-like systems this is often caused by scripts that are not executable.'
mlog.warning(msg)
return None
return out.strip()
def _get_env(self, uninstalled: bool = False) -> EnvironmentVariables:
env = EnvironmentVariables()
key = OptionKey('pkg_config_path', machine=self.for_machine)
extra_paths: T.List[str] = self.env.coredata.options[key].value[:]
if uninstalled:
uninstalled_path = Path(self.env.get_build_dir(), 'meson-uninstalled').as_posix()
if uninstalled_path not in extra_paths:
extra_paths.append(uninstalled_path)
env.set('PKG_CONFIG_PATH', extra_paths)
sysroot = self.env.properties[self.for_machine].get_sys_root()
if sysroot:
env.set('PKG_CONFIG_SYSROOT_DIR', [sysroot])
pkg_config_libdir_prop = self.env.properties[self.for_machine].get_pkg_config_libdir()
if pkg_config_libdir_prop:
env.set('PKG_CONFIG_LIBDIR', pkg_config_libdir_prop)
env.set('PKG_CONFIG', [join_args(self.pkgbin.get_command())])
return env
def _setup_env(self, env: EnvironOrDict, uninstalled: bool = False) -> T.Dict[str, str]:
envvars = self._get_env(uninstalled)
env = envvars.get_env(env)
# Dump all PKG_CONFIG environment variables
for key, value in env.items():
if key.startswith('PKG_'):
mlog.debug(f'env[{key}]: {value}')
return env
def _call_pkgbin(self, args: T.List[str], env: T.Optional[EnvironOrDict] = None) -> T.Tuple[int, str, str]:
assert isinstance(self.pkgbin, ExternalProgram)
env = env or os.environ
env = self._setup_env(env)
cmd = self.pkgbin.get_command() + args
p, out, err = Popen_safe_logged(cmd, env=env)
return p.returncode, out.strip(), err.strip()
class PkgConfigDependency(ExternalDependency):
def __init__(self, name: str, environment: Environment, kwargs: T.Dict[str, T.Any], language: T.Optional[str] = None) -> None:
super().__init__(DependencyTypeName('pkgconfig'), environment, kwargs, language=language)
self.name = name
self.is_libtool = False
pkgconfig = PkgConfigInterface.instance(self.env, self.for_machine, self.silent)
if not pkgconfig:
msg = f'Pkg-config for machine {self.for_machine} not found. Giving up.'
if self.required:
raise DependencyException(msg)
mlog.debug(msg)
return
self.pkgconfig = pkgconfig
version = self.pkgconfig.version(name)
if version is None:
return
self.version = version
self.is_found = True
try:
# Fetch cargs to be used while using this dependency
self._set_cargs()
# Fetch the libraries and library paths needed for using this
self._set_libs()
except DependencyException as e:
mlog.debug(f"Pkg-config error with '{name}': {e}")
if self.required:
raise
else:
self.compile_args = []
self.link_args = []
self.is_found = False
self.reason = e
def __repr__(self) -> str:
s = '<{0} {1}: {2} {3}>'
return s.format(self.__class__.__name__, self.name, self.is_found,
self.version_reqs)
def _convert_mingw_paths(self, args: ImmutableListProtocol[str]) -> T.List[str]:
'''
Both MSVC and native Python on Windows cannot handle MinGW-esque /c/foo
paths so convert them to C:/foo. We cannot resolve other paths starting
with / like /home/foo so leave them as-is so that the user gets an
error/warning from the compiler/linker.
'''
if not self.env.machines.build.is_windows():
return args.copy()
converted = []
for arg in args:
pargs: T.Tuple[str, ...] = tuple()
# Library search path
if arg.startswith('-L/'):
pargs = PurePath(arg[2:]).parts
tmpl = '-L{}:/{}'
elif arg.startswith('-I/'):
pargs = PurePath(arg[2:]).parts
tmpl = '-I{}:/{}'
# Full path to library or .la file
elif arg.startswith('/'):
pargs = PurePath(arg).parts
tmpl = '{}:/{}'
elif arg.startswith(('-L', '-I')) or (len(arg) > 2 and arg[1] == ':'):
# clean out improper '\\ ' as comes from some Windows pkg-config files
arg = arg.replace('\\ ', ' ')
if len(pargs) > 1 and len(pargs[1]) == 1:
arg = tmpl.format(pargs[1], '/'.join(pargs[2:]))
converted.append(arg)
return converted
def _set_cargs(self) -> None:
allow_system = False
if self.language == 'fortran':
# gfortran doesn't appear to look in system paths for INCLUDE files,
# so don't allow pkg-config to suppress -I flags for system paths
allow_system = True
cflags = self.pkgconfig.cflags(self.name, allow_system)
self.compile_args = self._convert_mingw_paths(cflags)
def _search_libs(self, libs_in: ImmutableListProtocol[str], raw_libs_in: ImmutableListProtocol[str]) -> T.Tuple[T.List[str], T.List[str]]:
'''
@libs_in: PKG_CONFIG_ALLOW_SYSTEM_LIBS=1 pkg-config --libs
@raw_libs_in: pkg-config --libs
We always look for the file ourselves instead of depending on the
compiler to find it with -lfoo or foo.lib (if possible) because:
1. We want to be able to select static or shared
2. We need the full path of the library to calculate RPATH values
3. De-dup of libraries is easier when we have absolute paths
Libraries that are provided by the toolchain or are not found by
find_library() will be added with -L -l pairs.
'''
# Library paths should be safe to de-dup
#
# First, figure out what library paths to use. Originally, we were
# doing this as part of the loop, but due to differences in the order
# of -L values between pkg-config and pkgconf, we need to do that as
# a separate step. See:
# https://github.com/mesonbuild/meson/issues/3951
# https://github.com/mesonbuild/meson/issues/4023
#
# Separate system and prefix paths, and ensure that prefix paths are
# always searched first.
prefix_libpaths: OrderedSet[str] = OrderedSet()
# We also store this raw_link_args on the object later
raw_link_args = self._convert_mingw_paths(raw_libs_in)
for arg in raw_link_args:
if arg.startswith('-L') and not arg.startswith(('-L-l', '-L-L')):
path = arg[2:]
if not os.path.isabs(path):
# Resolve the path as a compiler in the build directory would
path = os.path.join(self.env.get_build_dir(), path)
prefix_libpaths.add(path)
# Library paths are not always ordered in a meaningful way
#
# Instead of relying on pkg-config or pkgconf to provide -L flags in a
# specific order, we reorder library paths ourselves, according to th
# order specified in PKG_CONFIG_PATH. See:
# https://github.com/mesonbuild/meson/issues/4271
#
# Only prefix_libpaths are reordered here because there should not be
# too many system_libpaths to cause library version issues.
pkg_config_path: T.List[str] = self.env.coredata.options[OptionKey('pkg_config_path', machine=self.for_machine)].value
pkg_config_path = self._convert_mingw_paths(pkg_config_path)
prefix_libpaths = OrderedSet(sort_libpaths(list(prefix_libpaths), pkg_config_path))
system_libpaths: OrderedSet[str] = OrderedSet()
full_args = self._convert_mingw_paths(libs_in)
for arg in full_args:
if arg.startswith(('-L-l', '-L-L')):
# These are D language arguments, not library paths
continue
if arg.startswith('-L') and arg[2:] not in prefix_libpaths:
system_libpaths.add(arg[2:])
# Use this re-ordered path list for library resolution
libpaths = list(prefix_libpaths) + list(system_libpaths)
# Track -lfoo libraries to avoid duplicate work
libs_found: OrderedSet[str] = OrderedSet()
# Track not-found libraries to know whether to add library paths
libs_notfound = []
# Generate link arguments for this library
link_args = []
for lib in full_args:
if lib.startswith(('-L-l', '-L-L')):
# These are D language arguments, add them as-is
pass
elif lib.startswith('-L'):
# We already handled library paths above
continue
elif lib.startswith('-l:'):
# see: https://stackoverflow.com/questions/48532868/gcc-library-option-with-a-colon-llibevent-a
# also : See the documentation of -lnamespec | --library=namespec in the linker manual
# https://sourceware.org/binutils/docs-2.18/ld/Options.html
# Don't resolve the same -l:libfoo.a argument again
if lib in libs_found:
continue
libfilename = lib[3:]
foundname = None
for libdir in libpaths:
target = os.path.join(libdir, libfilename)
if os.path.exists(target):
foundname = target
break
if foundname is None:
if lib in libs_notfound:
continue
else:
mlog.warning('Library {!r} not found for dependency {!r}, may '
'not be successfully linked'.format(libfilename, self.name))
libs_notfound.append(lib)
else:
lib = foundname
elif lib.startswith('-l'):
# Don't resolve the same -lfoo argument again
if lib in libs_found:
continue
if self.clib_compiler:
args = self.clib_compiler.find_library(lib[2:], self.env,
libpaths, self.libtype,
lib_prefix_warning=False)
# If the project only uses a non-clib language such as D, Rust,
# C#, Python, etc, all we can do is limp along by adding the
# arguments as-is and then adding the libpaths at the end.
else:
args = None
if args is not None:
libs_found.add(lib)
# Replace -l arg with full path to library if available
# else, library is either to be ignored, or is provided by
# the compiler, can't be resolved, and should be used as-is
if args:
if not args[0].startswith('-l'):
lib = args[0]
else:
continue
else:
# Library wasn't found, maybe we're looking in the wrong
# places or the library will be provided with LDFLAGS or
# LIBRARY_PATH from the environment (on macOS), and many
# other edge cases that we can't account for.
#
# Add all -L paths and use it as -lfoo
if lib in libs_notfound:
continue
if self.static:
mlog.warning('Static library {!r} not found for dependency {!r}, may '
'not be statically linked'.format(lib[2:], self.name))
libs_notfound.append(lib)
elif lib.endswith(".la"):
shared_libname = self.extract_libtool_shlib(lib)
shared_lib = os.path.join(os.path.dirname(lib), shared_libname)
if not os.path.exists(shared_lib):
shared_lib = os.path.join(os.path.dirname(lib), ".libs", shared_libname)
if not os.path.exists(shared_lib):
raise DependencyException(f'Got a libtools specific "{lib}" dependencies'
'but we could not compute the actual shared'
'library path')
self.is_libtool = True
lib = shared_lib
if lib in link_args:
continue
link_args.append(lib)
# Add all -Lbar args if we have -lfoo args in link_args
if libs_notfound:
# Order of -L flags doesn't matter with ld, but it might with other
# linkers such as MSVC, so prepend them.
link_args = ['-L' + lp for lp in prefix_libpaths] + link_args
return link_args, raw_link_args
def _set_libs(self) -> None:
# Force pkg-config to output -L fields even if they are system
# paths so we can do manual searching with cc.find_library() later.
libs = self.pkgconfig.libs(self.name, self.static, allow_system=True)
# Also get the 'raw' output without -Lfoo system paths for adding -L
# args with -lfoo when a library can't be found, and also in
# gnome.generate_gir + gnome.gtkdoc which need -L -l arguments.
raw_libs = self.pkgconfig.libs(self.name, self.static, allow_system=False)
self.link_args, self.raw_link_args = self._search_libs(libs, raw_libs)
def extract_field(self, la_file: str, fieldname: str) -> T.Optional[str]:
with open(la_file, encoding='utf-8') as f:
for line in f:
arr = line.strip().split('=')
if arr[0] == fieldname:
return arr[1][1:-1]
return None
def extract_dlname_field(self, la_file: str) -> T.Optional[str]:
return self.extract_field(la_file, 'dlname')
def extract_libdir_field(self, la_file: str) -> T.Optional[str]:
return self.extract_field(la_file, 'libdir')
def extract_libtool_shlib(self, la_file: str) -> T.Optional[str]:
'''
Returns the path to the shared library
corresponding to this .la file
'''
dlname = self.extract_dlname_field(la_file)
if dlname is None:
return None
# Darwin uses absolute paths where possible; since the libtool files never
# contain absolute paths, use the libdir field
if self.env.machines[self.for_machine].is_darwin():
dlbasename = os.path.basename(dlname)
libdir = self.extract_libdir_field(la_file)
if libdir is None:
return dlbasename
return os.path.join(libdir, dlbasename)
# From the comments in extract_libtool(), older libtools had
# a path rather than the raw dlname
return os.path.basename(dlname)
@staticmethod
def log_tried() -> str:
return 'pkgconfig'
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: PkgConfigDefineType = None) -> str:
if pkgconfig:
try:
variable = self.pkgconfig.variable(self.name, pkgconfig, pkgconfig_define)
if variable is not None:
return variable
except DependencyException:
pass
if default_value is not None:
return default_value
raise DependencyException(f'Could not get pkg-config variable and no default provided for {self!r}')