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meson/mesonbuild/dependencies/pkgconfig.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 __future__ import annotations
from pathlib import Path
from .base import ExternalDependency, DependencyException, sort_libpaths, DependencyTypeName
from ..mesonlib import OptionKey, OrderedSet, PerMachine, Popen_safe
from ..programs import find_external_program, ExternalProgram
from .. import mlog
from pathlib import PurePath
import re
import os
import shlex
import typing as T
if T.TYPE_CHECKING:
from ..environment import Environment
from ..mesonlib import MachineChoice
from .._typing import ImmutableListProtocol
from ..build import EnvironmentVariables
class PkgConfigDependency(ExternalDependency):
# The class's copy of the pkg-config path. Avoids having to search for it
# multiple times in the same Meson invocation.
class_pkgbin: PerMachine[T.Union[None, bool, ExternalProgram]] = PerMachine(None, None)
# We cache all pkg-config subprocess invocations to avoid redundant calls
pkgbin_cache: T.Dict[
T.Tuple[ExternalProgram, T.Tuple[str, ...], T.FrozenSet[T.Tuple[str, str]]],
T.Tuple[int, str, str]
] = {}
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
# Store a copy of the pkg-config path on the object itself so it is
# stored in the pickled coredata and recovered.
self.pkgbin: T.Union[None, bool, ExternalProgram] = None
# Only search for pkg-config for each machine the first time and store
# the result in the class definition
if PkgConfigDependency.class_pkgbin[self.for_machine] is False:
mlog.debug(f'Pkg-config binary for {self.for_machine} is cached as not found.')
elif PkgConfigDependency.class_pkgbin[self.for_machine] is not None:
mlog.debug(f'Pkg-config binary for {self.for_machine} is cached.')
else:
assert PkgConfigDependency.class_pkgbin[self.for_machine] is None
mlog.debug(f'Pkg-config binary for {self.for_machine} is not cached.')
for potential_pkgbin in find_external_program(
self.env, self.for_machine, 'pkgconfig', 'Pkg-config',
environment.default_pkgconfig, allow_default_for_cross=False):
version_if_ok = self.check_pkgconfig(potential_pkgbin)
if not version_if_ok:
continue
if not self.silent:
mlog.log('Found pkg-config:', mlog.bold(potential_pkgbin.get_path()),
f'({version_if_ok})')
PkgConfigDependency.class_pkgbin[self.for_machine] = potential_pkgbin
break
else:
if not self.silent:
mlog.log('Found Pkg-config:', mlog.red('NO'))
# Set to False instead of None to signify that we've already
# searched for it and not found it
PkgConfigDependency.class_pkgbin[self.for_machine] = False
self.pkgbin = PkgConfigDependency.class_pkgbin[self.for_machine]
if self.pkgbin is False:
self.pkgbin = None
msg = f'Pkg-config binary for machine {self.for_machine} not found. Giving up.'
if self.required:
raise DependencyException(msg)
else:
mlog.debug(msg)
return
assert isinstance(self.pkgbin, ExternalProgram)
mlog.debug('Determining dependency {!r} with pkg-config executable '
'{!r}'.format(name, self.pkgbin.get_path()))
ret, self.version, _ = self._call_pkgbin(['--modversion', name])
if ret != 0:
return
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 _call_pkgbin_real(self, args: T.List[str], env: T.Dict[str, str]) -> T.Tuple[int, str, str]:
assert isinstance(self.pkgbin, ExternalProgram)
cmd = self.pkgbin.get_command() + args
p, out, err = Popen_safe(cmd, env=env)
rc, out, err = p.returncode, out.strip(), err.strip()
call = ' '.join(cmd)
mlog.debug(f"Called `{call}` -> {rc}\n{out}")
return rc, out, err
@staticmethod
def get_env(environment: 'Environment', for_machine: MachineChoice,
uninstalled: bool = False) -> 'EnvironmentVariables':
from ..build import EnvironmentVariables
env = EnvironmentVariables()
key = OptionKey('pkg_config_path', machine=for_machine)
extra_paths: T.List[str] = environment.coredata.options[key].value[:]
if uninstalled:
uninstalled_path = Path(environment.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 = environment.properties[for_machine].get_sys_root()
if sysroot:
env.set('PKG_CONFIG_SYSROOT_DIR', [sysroot])
pkg_config_libdir_prop = environment.properties[for_machine].get_pkg_config_libdir()
if pkg_config_libdir_prop:
env.set('PKG_CONFIG_LIBDIR', pkg_config_libdir_prop)
return env
@staticmethod
def setup_env(env: T.MutableMapping[str, str], environment: 'Environment', for_machine: MachineChoice,
uninstalled: bool = False) -> T.Dict[str, str]:
envvars = PkgConfigDependency.get_env(environment, for_machine, 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[T.MutableMapping[str, str]] = None) -> T.Tuple[int, str, str]:
assert isinstance(self.pkgbin, ExternalProgram)
env = env or os.environ
env = PkgConfigDependency.setup_env(env, self.env, self.for_machine)
fenv = frozenset(env.items())
targs = tuple(args)
cache = PkgConfigDependency.pkgbin_cache
if (self.pkgbin, targs, fenv) not in cache:
cache[(self.pkgbin, targs, fenv)] = self._call_pkgbin_real(args, env)
return cache[(self.pkgbin, targs, fenv)]
def _convert_mingw_paths(self, args: T.List[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
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 _split_args(self, 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 _set_cargs(self) -> None:
env = None
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
env = os.environ.copy()
env['PKG_CONFIG_ALLOW_SYSTEM_CFLAGS'] = '1'
ret, out, err = self._call_pkgbin(['--cflags', self.name], env=env)
if ret != 0:
raise DependencyException(f'Could not generate cargs for {self.name}:\n{err}\n')
self.compile_args = self._convert_mingw_paths(self._split_args(out))
def _search_libs(self, out: str, out_raw: str) -> T.Tuple[T.List[str], T.List[str]]:
'''
@out: PKG_CONFIG_ALLOW_SYSTEM_LIBS=1 pkg-config --libs
@out_raw: 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(self._split_args(out_raw))
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(self._split_args(out))
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)
# 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:
env = None
libcmd = ['--libs']
if self.static:
libcmd.append('--static')
libcmd.append(self.name)
# Force pkg-config to output -L fields even if they are system
# paths so we can do manual searching with cc.find_library() later.
env = os.environ.copy()
env['PKG_CONFIG_ALLOW_SYSTEM_LIBS'] = '1'
ret, out, err = self._call_pkgbin(libcmd, env=env)
if ret != 0:
raise DependencyException(f'Could not generate libs for {self.name}:\n{err}\n')
# 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.
ret, out_raw, err_raw = self._call_pkgbin(libcmd)
if ret != 0:
raise DependencyException(f'Could not generate libs for {self.name}:\n\n{out_raw}')
self.link_args, self.raw_link_args = self._search_libs(out, out_raw)
def get_pkgconfig_variable(self, variable_name: str,
define_variable: 'ImmutableListProtocol[str]',
default: T.Optional[str]) -> str:
options = ['--variable=' + variable_name, self.name]
if define_variable:
options = ['--define-variable=' + '='.join(define_variable)] + options
ret, out, err = self._call_pkgbin(options)
variable = ''
if ret != 0:
if self.required:
raise DependencyException(f'dependency {self.name} not found:\n{err}\n')
else:
variable = out.strip()
# pkg-config doesn't distinguish between empty and non-existent variables
# use the variable list to check for variable existence
if not variable:
ret, out, _ = self._call_pkgbin(['--print-variables', self.name])
if not re.search(r'^' + variable_name + r'$', out, re.MULTILINE):
if default is not None:
variable = default
else:
mlog.warning(f"pkgconfig variable '{variable_name}' not defined for dependency {self.name}.")
mlog.debug(f'Got pkgconfig variable {variable_name} : {variable}')
return variable
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 run')
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 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)
def log_tried(self) -> str:
return self.type_name
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) -> str:
if pkgconfig:
try:
return self.get_pkgconfig_variable(pkgconfig, pkgconfig_define or [], default_value)
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}')