# 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 ..utils.core import EnvironOrDict 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 = self._detect_pkgbin(self.silent, self.env, 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) @classmethod def _detect_pkgbin(cls, silent: bool, env: Environment, for_machine: MachineChoice) -> T.Union[None, bool, ExternalProgram]: # Only search for pkg-config for each machine the first time and store # the result in the class definition if cls.class_pkgbin[for_machine] is False: mlog.debug(f'Pkg-config binary for {for_machine} is cached as not found.') elif cls.class_pkgbin[for_machine] is not None: mlog.debug(f'Pkg-config binary for {for_machine} is cached.') else: assert cls.class_pkgbin[for_machine] is None, 'for mypy' mlog.debug(f'Pkg-config binary for {for_machine} is not cached.') for potential_pkgbin in find_external_program( env, for_machine, 'pkgconfig', 'Pkg-config', env.default_pkgconfig, allow_default_for_cross=False): version_if_ok = cls.check_pkgconfig(env, potential_pkgbin) if not version_if_ok: continue if not silent: mlog.log('Found pkg-config:', mlog.bold(potential_pkgbin.get_path()), f'({version_if_ok})') cls.class_pkgbin[for_machine] = potential_pkgbin break else: if not 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 cls.class_pkgbin[for_machine] = False return cls.class_pkgbin[for_machine] 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}") if out: mlog.debug(f'stdout:\n{out}\n-----------') if err: mlog.debug(f'stderr:\n{err}\n-----------') 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: EnvironOrDict, 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[EnvironOrDict] = 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, 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: env = None libcmd = ['--libs'] if self.static or \ (self.env.properties[self.for_machine].get('pkg_config_static', None) == 'true'): 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 nonexistent 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 @staticmethod def check_pkgconfig(env: Environment, 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 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) @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: 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}')