# Copyright 2013-2017 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. # This file contains the detection logic for external dependencies. # Custom logic for several other packages are in separate files. import os import shutil import stat import sys from enum import Enum from .. import mlog from .. import mesonlib from ..mesonlib import MesonException, Popen_safe, flatten, version_compare_many # This must be defined in this file to avoid cyclical references. packages = {} class DependencyException(MesonException): '''Exceptions raised while trying to find dependencies''' class DependencyMethods(Enum): # Auto means to use whatever dependency checking mechanisms in whatever order meson thinks is best. AUTO = 'auto' PKGCONFIG = 'pkg-config' QMAKE = 'qmake' # Just specify the standard link arguments, assuming the operating system provides the library. SYSTEM = 'system' # Detect using sdl2-config SDLCONFIG = 'sdlconfig' # This is only supported on OSX - search the frameworks directory by name. EXTRAFRAMEWORK = 'extraframework' # Detect using the sysconfig module. SYSCONFIG = 'sysconfig' class Dependency: def __init__(self, type_name, kwargs): self.name = "null" self.language = None self.is_found = False self.type_name = type_name method = DependencyMethods(kwargs.get('method', 'auto')) # Set the detection method. If the method is set to auto, use any available method. # If method is set to a specific string, allow only that detection method. if method == DependencyMethods.AUTO: self.methods = self.get_methods() elif method in self.get_methods(): self.methods = [method] else: raise MesonException( 'Unsupported detection method: {}, allowed methods are {}'.format( method.value, mlog.format_list(map(lambda x: x.value, [DependencyMethods.AUTO] + self.get_methods())))) def __repr__(self): s = '<{0} {1}: {2}>' return s.format(self.__class__.__name__, self.name, self.is_found) def get_compile_args(self): return [] def get_link_args(self): return [] def found(self): return self.is_found def get_sources(self): """Source files that need to be added to the target. As an example, gtest-all.cc when using GTest.""" return [] def get_methods(self): return [DependencyMethods.AUTO] def get_name(self): return self.name def get_exe_args(self, compiler): return [] def need_threads(self): return False def get_pkgconfig_variable(self, variable_name): raise MesonException('Tried to get a pkg-config variable from a non-pkgconfig dependency.') class InternalDependency(Dependency): def __init__(self, version, incdirs, compile_args, link_args, libraries, sources, ext_deps): super().__init__('internal', {}) self.version = version self.is_found = True self.include_directories = incdirs self.compile_args = compile_args self.link_args = link_args self.libraries = libraries self.sources = sources self.ext_deps = ext_deps def get_compile_args(self): return self.compile_args def get_link_args(self): return self.link_args def get_version(self): return self.version class PkgConfigDependency(Dependency): # The class's copy of the pkg-config path. Avoids having to search for it # multiple times in the same Meson invocation. class_pkgbin = None def __init__(self, name, environment, kwargs): Dependency.__init__(self, 'pkgconfig', kwargs) self.is_libtool = False self.version_reqs = kwargs.get('version', None) self.required = kwargs.get('required', True) self.static = kwargs.get('static', False) self.silent = kwargs.get('silent', False) if not isinstance(self.static, bool): raise DependencyException('Static keyword must be boolean') # Store a copy of the pkg-config path on the object itself so it is # stored in the pickled coredata and recovered. self.pkgbin = None self.cargs = [] self.libs = [] if 'native' in kwargs and environment.is_cross_build(): self.want_cross = not kwargs['native'] else: self.want_cross = environment.is_cross_build() self.name = name self.modversion = 'none' # When finding dependencies for cross-compiling, we don't care about # the 'native' pkg-config if self.want_cross: if 'pkgconfig' not in environment.cross_info.config['binaries']: if self.required: raise DependencyException('Pkg-config binary missing from cross file') else: pkgname = environment.cross_info.config['binaries']['pkgconfig'] potential_pkgbin = ExternalProgram(pkgname, silent=True) if potential_pkgbin.found(): # FIXME, we should store all pkg-configs in ExternalPrograms. # However that is too destabilizing a change to do just before release. self.pkgbin = potential_pkgbin.get_command()[0] PkgConfigDependency.class_pkgbin = self.pkgbin else: mlog.debug('Cross pkg-config %s not found.' % potential_pkgbin.name) # Only search for the native pkg-config the first time and # store the result in the class definition elif PkgConfigDependency.class_pkgbin is None: self.pkgbin = self.check_pkgconfig() PkgConfigDependency.class_pkgbin = self.pkgbin else: self.pkgbin = PkgConfigDependency.class_pkgbin self.is_found = False if not self.pkgbin: if self.required: raise DependencyException('Pkg-config not found.') return if self.want_cross: self.type_string = 'Cross' else: self.type_string = 'Native' mlog.debug('Determining dependency {!r} with pkg-config executable ' '{!r}'.format(name, self.pkgbin)) ret, self.modversion = self._call_pkgbin(['--modversion', name]) if ret != 0: if self.required: raise DependencyException('{} dependency {!r} not found' ''.format(self.type_string, name)) return found_msg = [self.type_string + ' dependency', mlog.bold(name), 'found:'] if self.version_reqs is None: self.is_found = True else: if not isinstance(self.version_reqs, (str, list)): raise DependencyException('Version argument must be string or list.') if isinstance(self.version_reqs, str): self.version_reqs = [self.version_reqs] (self.is_found, not_found, found) = \ version_compare_many(self.modversion, self.version_reqs) if not self.is_found: found_msg += [mlog.red('NO'), 'found {!r} but need:'.format(self.modversion), ', '.join(["'{}'".format(e) for e in not_found])] if found: found_msg += ['; matched:', ', '.join(["'{}'".format(e) for e in found])] if not self.silent: mlog.log(*found_msg) if self.required: m = 'Invalid version of dependency, need {!r} {!r} found {!r}.' raise DependencyException(m.format(name, not_found, self.modversion)) return found_msg += [mlog.green('YES'), self.modversion] # 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() # Print the found message only at the very end because fetching cflags # and libs can also fail if other needed pkg-config files aren't found. if not self.silent: mlog.log(*found_msg) def __repr__(self): s = '<{0} {1}: {2} {3}>' return s.format(self.__class__.__name__, self.name, self.is_found, self.version_reqs) def _call_pkgbin(self, args): p, out = Popen_safe([self.pkgbin] + args, env=os.environ)[0:2] return p.returncode, out.strip() def _set_cargs(self): ret, out = self._call_pkgbin(['--cflags', self.name]) if ret != 0: raise DependencyException('Could not generate cargs for %s:\n\n%s' % (self.name, out)) self.cargs = out.split() def _set_libs(self): libcmd = [self.name, '--libs'] if self.static: libcmd.append('--static') ret, out = self._call_pkgbin(libcmd) if ret != 0: raise DependencyException('Could not generate libs for %s:\n\n%s' % (self.name, out)) self.libs = [] for lib in out.split(): if 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('Got a libtools specific "%s" dependencies' 'but we could not compute the actual shared' 'library path' % lib) lib = shared_lib self.is_libtool = True self.libs.append(lib) def get_pkgconfig_variable(self, variable_name): ret, out = self._call_pkgbin(['--variable=' + variable_name, self.name]) variable = '' if ret != 0: if self.required: raise DependencyException('%s dependency %s not found.' % (self.type_string, self.name)) else: variable = out.strip() mlog.debug('Got pkgconfig variable %s : %s' % (variable_name, variable)) return variable def get_modversion(self): return self.modversion def get_version(self): return self.modversion def get_compile_args(self): return self.cargs def get_link_args(self): return self.libs def get_methods(self): return [DependencyMethods.PKGCONFIG] def check_pkgconfig(self): evar = 'PKG_CONFIG' if evar in os.environ: pkgbin = os.environ[evar].strip() else: pkgbin = 'pkg-config' try: p, out = Popen_safe([pkgbin, '--version'])[0:2] if p.returncode != 0: # Set to False instead of None to signify that we've already # searched for it and not found it pkgbin = False except (FileNotFoundError, PermissionError): pkgbin = False if pkgbin and not os.path.isabs(pkgbin) and shutil.which(pkgbin): # Sometimes shutil.which fails where Popen succeeds, so # only find the abs path if it can be found by shutil.which pkgbin = shutil.which(pkgbin) if not self.silent: if pkgbin: mlog.log('Found pkg-config:', mlog.bold(pkgbin), '(%s)' % out.strip()) else: mlog.log('Found Pkg-config:', mlog.red('NO')) return pkgbin def found(self): return self.is_found def extract_field(self, la_file, fieldname): with open(la_file) 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): return self.extract_field(la_file, 'dlname') def extract_libdir_field(self, la_file): return self.extract_field(la_file, 'libdir') def extract_libtool_shlib(self, la_file): ''' 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 mesonlib.is_osx(): 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) class ExternalProgram: windows_exts = ('exe', 'msc', 'com', 'bat') def __init__(self, name, command=None, silent=False, search_dir=None): self.name = name if command is not None: if not isinstance(command, list): self.command = [command] else: self.command = command else: self.command = self._search(name, search_dir) if not silent: if self.found(): mlog.log('Program', mlog.bold(name), 'found:', mlog.green('YES'), '(%s)' % ' '.join(self.command)) else: mlog.log('Program', mlog.bold(name), 'found:', mlog.red('NO')) def __repr__(self): r = '<{} {!r} -> {!r}>' return r.format(self.__class__.__name__, self.name, self.command) @staticmethod def _shebang_to_cmd(script): """ Check if the file has a shebang and manually parse it to figure out the interpreter to use. This is useful if the script is not executable or if we're on Windows (which does not understand shebangs). """ try: with open(script) as f: first_line = f.readline().strip() if first_line.startswith('#!'): commands = first_line[2:].split('#')[0].strip().split() if mesonlib.is_windows(): # Windows does not have UNIX paths so remove them, # but don't remove Windows paths if commands[0].startswith('/'): commands[0] = commands[0].split('/')[-1] if len(commands) > 0 and commands[0] == 'env': commands = commands[1:] # Windows does not ship python3.exe, but we know the path to it if len(commands) > 0 and commands[0] == 'python3': commands[0] = sys.executable return commands + [script] except Exception: pass return False def _is_executable(self, path): suffix = os.path.splitext(path)[-1].lower()[1:] if mesonlib.is_windows(): if suffix in self.windows_exts: return True elif os.access(path, os.X_OK): return not os.path.isdir(path) return False def _search_dir(self, name, search_dir): if search_dir is None: return False trial = os.path.join(search_dir, name) if os.path.exists(trial): if self._is_executable(trial): return [trial] # Now getting desperate. Maybe it is a script file that is # a) not chmodded executable, or # b) we are on windows so they can't be directly executed. return self._shebang_to_cmd(trial) else: if mesonlib.is_windows(): for ext in self.windows_exts: trial_ext = '{}.{}'.format(trial, ext) if os.path.exists(trial_ext): return [trial_ext] return False def _search(self, name, search_dir): ''' Search in the specified dir for the specified executable by name and if not found search in PATH ''' commands = self._search_dir(name, search_dir) if commands: return commands # Do a standard search in PATH command = shutil.which(name) if not mesonlib.is_windows(): # On UNIX-like platforms, shutil.which() is enough to find # all executables whether in PATH or with an absolute path return [command] # HERE BEGINS THE TERROR OF WINDOWS if command: # On Windows, even if the PATH search returned a full path, we can't be # sure that it can be run directly if it's not a native executable. # For instance, interpreted scripts sometimes need to be run explicitly # with an interpreter if the file association is not done properly. name_ext = os.path.splitext(command)[1] if name_ext[1:].lower() in self.windows_exts: # Good, it can be directly executed return [command] # Try to extract the interpreter from the shebang commands = self._shebang_to_cmd(command) if commands: return commands else: # Maybe the name is an absolute path to a native Windows # executable, but without the extension. This is technically wrong, # but many people do it because it works in the MinGW shell. if os.path.isabs(name): for ext in self.windows_exts: command = '{}.{}'.format(name, ext) if os.path.exists(command): return [command] # On Windows, interpreted scripts must have an extension otherwise they # cannot be found by a standard PATH search. So we do a custom search # where we manually search for a script with a shebang in PATH. search_dirs = os.environ.get('PATH', '').split(';') for search_dir in search_dirs: commands = self._search_dir(name, search_dir) if commands: return commands return [None] def found(self): return self.command[0] is not None def get_command(self): return self.command[:] def get_path(self): if self.found(): # Assume that the last element is the full path to the script or # binary being run return self.command[-1] return None def get_name(self): return self.name class ExternalLibrary(Dependency): # TODO: Add `language` support to all Dependency objects so that languages # can be exposed for dependencies that support that (i.e., not pkg-config) def __init__(self, name, link_args, language, silent=False): super().__init__('external', {}) self.name = name self.language = language self.is_found = False self.link_args = [] self.lang_args = [] if link_args: self.is_found = True if not isinstance(link_args, list): link_args = [link_args] self.lang_args = {language: link_args} # We special-case Vala for now till the Dependency object gets # proper support for exposing the language it was written in. # Without this, vala-specific link args will end up in the C link # args list if you link to a Vala library. # This hack use to be in CompilerHolder.find_library(). if language != 'vala': self.link_args = link_args if not silent: if self.is_found: mlog.log('Library', mlog.bold(name), 'found:', mlog.green('YES')) else: mlog.log('Library', mlog.bold(name), 'found:', mlog.red('NO')) def found(self): return self.is_found def get_name(self): return self.name def get_link_args(self): return self.link_args def get_lang_args(self, lang): if lang in self.lang_args: return self.lang_args[lang] return [] class ExtraFrameworkDependency(Dependency): def __init__(self, name, required, path, kwargs): Dependency.__init__(self, 'extraframeworks', kwargs) self.name = None self.required = required self.detect(name, path) if self.found(): mlog.log('Dependency', mlog.bold(name), 'found:', mlog.green('YES'), os.path.join(self.path, self.name)) else: mlog.log('Dependency', name, 'found:', mlog.red('NO')) def detect(self, name, path): lname = name.lower() if path is None: paths = ['/Library/Frameworks'] else: paths = [path] for p in paths: for d in os.listdir(p): fullpath = os.path.join(p, d) if lname != d.split('.')[0].lower(): continue if not stat.S_ISDIR(os.stat(fullpath).st_mode): continue self.path = p self.name = d return if not self.found() and self.required: raise DependencyException('Framework dependency %s not found.' % (name, )) def get_compile_args(self): if self.found(): return ['-I' + os.path.join(self.path, self.name, 'Headers')] return [] def get_link_args(self): if self.found(): return ['-F' + self.path, '-framework', self.name.split('.')[0]] return [] def found(self): return self.name is not None def get_version(self): return 'unknown' def get_dep_identifier(name, kwargs, want_cross): # Need immutable objects since the identifier will be used as a dict key version_reqs = flatten(kwargs.get('version', [])) if isinstance(version_reqs, list): version_reqs = frozenset(version_reqs) identifier = (name, version_reqs, want_cross) for key, value in kwargs.items(): # 'version' is embedded above as the second element for easy access # 'native' is handled above with `want_cross` # 'required' is irrelevant for caching; the caller handles it separately # 'fallback' subprojects cannot be cached -- they must be initialized if key in ('version', 'native', 'required', 'fallback',): continue # All keyword arguments are strings, ints, or lists (or lists of lists) if isinstance(value, list): value = frozenset(flatten(value)) identifier += (key, value) return identifier def find_external_dependency(name, environment, kwargs): required = kwargs.get('required', True) if not isinstance(required, bool): raise DependencyException('Keyword "required" must be a boolean.') if not isinstance(kwargs.get('method', ''), str): raise DependencyException('Keyword "method" must be a string.') lname = name.lower() if lname in packages: dep = packages[lname](environment, kwargs) if required and not dep.found(): raise DependencyException('Dependency "%s" not found' % name) return dep pkg_exc = None pkgdep = None try: pkgdep = PkgConfigDependency(name, environment, kwargs) if pkgdep.found(): return pkgdep except Exception as e: pkg_exc = e if mesonlib.is_osx(): fwdep = ExtraFrameworkDependency(name, required, None, kwargs) if required and not fwdep.found(): m = 'Dependency {!r} not found, tried Extra Frameworks ' \ 'and Pkg-Config:\n\n' + str(pkg_exc) raise DependencyException(m.format(name)) return fwdep if pkg_exc is not None: raise pkg_exc mlog.log('Dependency', mlog.bold(name), 'found:', mlog.red('NO')) return pkgdep def dependency_get_compiler(language, environment, kwargs): if 'native' in kwargs and environment.is_cross_build(): want_cross = not kwargs['native'] else: want_cross = environment.is_cross_build() if want_cross: compilers = environment.coredata.cross_compilers else: compilers = environment.coredata.compilers return compilers.get(language, None)