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build_ext.py
import os import sys import itertools from importlib.machinery import EXTENSION_SUFFIXES from importlib.util import cache_from_source as _compiled_file_name from typing import Dict, Iterator, List, Tuple from pathlib import Path from distutils.command.build_ext import build_ext as _du_build_ext from distutils.ccompiler import new_compiler from distutils.sysconfig import customize_compiler, get_config_var from distutils import log from setuptools.errors import BaseError from setuptools.extension import Extension, Library try: # Attempt to use Cython for building extensions, if available from Cython.Distutils.build_ext import build_ext as _build_ext # Additionally, assert that the compiler module will load # also. Ref #1229. __import__('Cython.Compiler.Main') except ImportError: _build_ext = _du_build_ext # make sure _config_vars is initialized get_config_var("LDSHARED") from distutils.sysconfig import _config_vars as _CONFIG_VARS # noqa def _customize_compiler_for_shlib(compiler): if sys.platform == "darwin": # building .dylib requires additional compiler flags on OSX; here we # temporarily substitute the pyconfig.h variables so that distutils' # 'customize_compiler' uses them before we build the shared libraries. tmp = _CONFIG_VARS.copy() try: # XXX Help! I don't have any idea whether these are right... _CONFIG_VARS[ 'LDSHARED' ] = "gcc -Wl,-x -dynamiclib -undefined dynamic_lookup" _CONFIG_VARS['CCSHARED'] = " -dynamiclib" _CONFIG_VARS['SO'] = ".dylib" customize_compiler(compiler) finally: _CONFIG_VARS.clear() _CONFIG_VARS.update(tmp) else: customize_compiler(compiler) have_rtld = False use_stubs = False libtype = 'shared' if sys.platform == "darwin": use_stubs = True elif os.name != 'nt': try: import dl use_stubs = have_rtld = hasattr(dl, 'RTLD_NOW') except ImportError: pass def if_dl(s): return s if have_rtld else '' def get_abi3_suffix(): """Return the file extension for an abi3-compliant Extension()""" for suffix in EXTENSION_SUFFIXES: if '.abi3' in suffix: # Unix return suffix elif suffix == '.pyd': # Windows return suffix class build_ext(_build_ext): editable_mode: bool = False inplace: bool = False def run(self): """Build extensions in build directory, then copy if --inplace""" old_inplace, self.inplace = self.inplace, 0 _build_ext.run(self) self.inplace = old_inplace if old_inplace: self.copy_extensions_to_source() def _get_inplace_equivalent(self, build_py, ext: Extension) -> Tuple[str, str]: fullname = self.get_ext_fullname(ext.name) filename = self.get_ext_filename(fullname) modpath = fullname.split('.') package = '.'.join(modpath[:-1]) package_dir = build_py.get_package_dir(package) inplace_file = os.path.join(package_dir, os.path.basename(filename)) regular_file = os.path.join(self.build_lib, filename) return (inplace_file, regular_file) def copy_extensions_to_source(self): build_py = self.get_finalized_command('build_py') for ext in self.extensions: inplace_file, regular_file = self._get_inplace_equivalent(build_py, ext) # Always copy, even if source is older than destination, to ensure # that the right extensions for the current Python/platform are # used. if os.path.exists(regular_file) or not ext.optional: self.copy_file(regular_file, inplace_file, level=self.verbose) if ext._needs_stub: inplace_stub = self._get_equivalent_stub(ext, inplace_file) self._write_stub_file(inplace_stub, ext, compile=True) # Always compile stub and remove the original (leave the cache behind) # (this behaviour was observed in previous iterations of the code) def _get_equivalent_stub(self, ext: Extension, output_file: str) -> str: dir_ = os.path.dirname(output_file) _, _, name = ext.name.rpartition(".") return f"{os.path.join(dir_, name)}.py" def _get_output_mapping(self) -> Iterator[Tuple[str, str]]: if not self.inplace: return build_py = self.get_finalized_command('build_py') opt = self.get_finalized_command('install_lib').optimize or "" for ext in self.extensions: inplace_file, regular_file = self._get_inplace_equivalent(build_py, ext) yield (regular_file, inplace_file) if ext._needs_stub: # This version of `build_ext` always builds artifacts in another dir, # when "inplace=True" is given it just copies them back. # This is done in the `copy_extensions_to_source` function, which # always compile stub files via `_compile_and_remove_stub`. # At the end of the process, a `.pyc` stub file is created without the # corresponding `.py`. inplace_stub = self._get_equivalent_stub(ext, inplace_file) regular_stub = self._get_equivalent_stub(ext, regular_file) inplace_cache = _compiled_file_name(inplace_stub, optimization=opt) output_cache = _compiled_file_name(regular_stub, optimization=opt) yield (output_cache, inplace_cache) def get_ext_filename(self, fullname): so_ext = os.getenv('SETUPTOOLS_EXT_SUFFIX') if so_ext: filename = os.path.join(*fullname.split('.')) + so_ext else: filename = _build_ext.get_ext_filename(self, fullname) so_ext = get_config_var('EXT_SUFFIX') if fullname in self.ext_map: ext = self.ext_map[fullname] use_abi3 = getattr(ext, 'py_limited_api') and get_abi3_suffix() if use_abi3: filename = filename[: -len(so_ext)] so_ext = get_abi3_suffix() filename = filename + so_ext if isinstance(ext, Library): fn, ext = os.path.splitext(filename) return self.shlib_compiler.library_filename(fn, libtype) elif use_stubs and ext._links_to_dynamic: d, fn = os.path.split(filename) return os.path.join(d, 'dl-' + fn) return filename def initialize_options(self): _build_ext.initialize_options(self) self.shlib_compiler = None self.shlibs = [] self.ext_map = {} self.editable_mode = False def finalize_options(self): _build_ext.finalize_options(self) self.extensions = self.extensions or [] self.check_extensions_list(self.extensions) self.shlibs = [ext for ext in self.extensions if isinstance(ext, Library)] if self.shlibs: self.setup_shlib_compiler() for ext in self.extensions: ext._full_name = self.get_ext_fullname(ext.name) for ext in self.extensions: fullname = ext._full_name self.ext_map[fullname] = ext # distutils 3.1 will also ask for module names # XXX what to do with conflicts? self.ext_map[fullname.split('.')[-1]] = ext ltd = self.shlibs and self.links_to_dynamic(ext) or False ns = ltd and use_stubs and not isinstance(ext, Library) ext._links_to_dynamic = ltd ext._needs_stub = ns filename = ext._file_name = self.get_ext_filename(fullname) libdir = os.path.dirname(os.path.join(self.build_lib, filename)) if ltd and libdir not in ext.library_dirs: ext.library_dirs.append(libdir) if ltd and use_stubs and os.curdir not in ext.runtime_library_dirs: ext.runtime_library_dirs.append(os.curdir) if self.editable_mode: self.inplace = True def setup_shlib_compiler(self): compiler = self.shlib_compiler = new_compiler( compiler=self.compiler, dry_run=self.dry_run, force=self.force ) _customize_compiler_for_shlib(compiler) if self.include_dirs is not None: compiler.set_include_dirs(self.include_dirs) if self.define is not None: # 'define' option is a list of (name,value) tuples for name, value in self.define: compiler.define_macro(name, value) if self.undef is not None: for macro in self.undef: compiler.undefine_macro(macro) if self.libraries is not None: compiler.set_libraries(self.libraries) if self.library_dirs is not None: compiler.set_library_dirs(self.library_dirs) if self.rpath is not None: compiler.set_runtime_library_dirs(self.rpath) if self.link_objects is not None: compiler.set_link_objects(self.link_objects) # hack so distutils' build_extension() builds a library instead compiler.link_shared_object = link_shared_object.__get__(compiler) def get_export_symbols(self, ext): if isinstance(ext, Library): return ext.export_symbols return _build_ext.get_export_symbols(self, ext) def build_extension(self, ext): ext._convert_pyx_sources_to_lang() _compiler = self.compiler try: if isinstance(ext, Library): self.compiler = self.shlib_compiler _build_ext.build_extension(self, ext) if ext._needs_stub: build_lib = self.get_finalized_command('build_py').build_lib self.write_stub(build_lib, ext) finally: self.compiler = _compiler def links_to_dynamic(self, ext): """Return true if 'ext' links to a dynamic lib in the same package""" # XXX this should check to ensure the lib is actually being built # XXX as dynamic, and not just using a locally-found version or a # XXX static-compiled version libnames = dict.fromkeys([lib._full_name for lib in self.shlibs]) pkg = '.'.join(ext._full_name.split('.')[:-1] + ['']) return any(pkg + libname in libnames for libname in ext.libraries) def get_source_files(self) -> List[str]: return [*_build_ext.get_source_files(self), *self._get_internal_depends()] def _get_internal_depends(self) -> Iterator[str]: """Yield ``ext.depends`` that are contained by the project directory""" project_root = Path(self.distribution.src_root or os.curdir).resolve() depends = (dep for ext in self.extensions for dep in ext.depends) def skip(orig_path: str, reason: str) -> None: log.info( "dependency %s won't be automatically " "included in the manifest: the path %s", orig_path, reason, ) for dep in depends: path = Path(dep) if path.is_absolute(): skip(dep, "must be relative") continue if ".." in path.parts: skip(dep, "can't have `..` segments") continue try: resolved = (project_root / path).resolve(strict=True) except OSError: skip(dep, "doesn't exist") continue try: resolved.relative_to(project_root) except ValueError: skip(dep, "must be inside the project root") continue yield path.as_posix() def get_outputs(self) -> List[str]: if self.inplace: return list(self.get_output_mapping().keys()) return sorted(_build_ext.get_outputs(self) + self.__get_stubs_outputs()) def get_output_mapping(self) -> Dict[str, str]: """See :class:`setuptools.commands.build.SubCommand`""" mapping = self._get_output_mapping() return dict(sorted(mapping, key=lambda x: x[0])) def __get_stubs_outputs(self): # assemble the base name for each extension that needs a stub ns_ext_bases = ( os.path.join(self.build_lib, *ext._full_name.split('.')) for ext in self.extensions if ext._needs_stub ) # pair each base with the extension pairs = itertools.product(ns_ext_bases, self.__get_output_extensions()) return list(base + fnext for base, fnext in pairs) def __get_output_extensions(self): yield '.py' yield '.pyc' if self.get_finalized_command('build_py').optimize: yield '.pyo' def write_stub(self, output_dir, ext, compile=False): stub_file = os.path.join(output_dir, *ext._full_name.split('.')) + '.py' self._write_stub_file(stub_file, ext, compile) def _write_stub_file(self, stub_file: str, ext: Extension, compile=False): log.info("writing stub loader for %s to %s", ext._full_name, stub_file) if compile and os.path.exists(stub_file): raise BaseError(stub_file + " already exists! Please delete.") if not self.dry_run: f = open(stub_file, 'w') f.write( '\n'.join( [ "def __bootstrap__():", " global __bootstrap__, __file__, __loader__", " import sys, os, pkg_resources, importlib.util" + if_dl(", dl"), " __file__ = pkg_resources.resource_filename" "(__name__,%r)" % os.path.basename(ext._file_name), " del __bootstrap__", " if '__loader__' in globals():", " del __loader__", if_dl(" old_flags = sys.getdlopenflags()"), " old_dir = os.getcwd()", " try:", " os.chdir(os.path.dirname(__file__))", if_dl(" sys.setdlopenflags(dl.RTLD_NOW)"), " spec = importlib.util.spec_from_file_location(", " __name__, __file__)", " mod = importlib.util.module_from_spec(spec)", " spec.loader.exec_module(mod)", " finally:", if_dl(" sys.setdlopenflags(old_flags)"), " os.chdir(old_dir)", "__bootstrap__()", "", # terminal \n ] ) ) f.close() if compile: self._compile_and_remove_stub(stub_file) def _compile_and_remove_stub(self, stub_file: str): from distutils.util import byte_compile byte_compile([stub_file], optimize=0, force=True, dry_run=self.dry_run) optimize = self.get_finalized_command('install_lib').optimize if optimize > 0: byte_compile( [stub_file], optimize=optimize, force=True, dry_run=self.dry_run ) if os.path.exists(stub_file) and not self.dry_run: os.unlink(stub_file) if use_stubs or os.name == 'nt': # Build shared libraries # def link_shared_object( self, objects, output_libname, output_dir=None, libraries=None, library_dirs=None, runtime_library_dirs=None, export_symbols=None, debug=0, extra_preargs=None, extra_postargs=None, build_temp=None, target_lang=None, ): self.link( self.SHARED_LIBRARY, objects, output_libname, output_dir, libraries, library_dirs, runtime_library_dirs, export_symbols, debug, extra_preargs, extra_postargs, build_temp, target_lang, ) else: # Build static libraries everywhere else libtype = 'static' def link_shared_object( self, objects, output_libname, output_dir=None, libraries=None, library_dirs=None, runtime_library_dirs=None, export_symbols=None, debug=0, extra_preargs=None, extra_postargs=None, build_temp=None, target_lang=None, ): # XXX we need to either disallow these attrs on Library instances, # or warn/abort here if set, or something... # libraries=None, library_dirs=None, runtime_library_dirs=None, # export_symbols=None, extra_preargs=None, extra_postargs=None, # build_temp=None assert output_dir is None # distutils build_ext doesn't pass this output_dir, filename = os.path.split(output_libname) basename, ext = os.path.splitext(filename) if self.library_filename("x").startswith('lib'): # strip 'lib' prefix; this is kludgy if some platform uses # a different prefix basename = basename[3:] self.create_static_lib(objects, basename, output_dir, debug, target_lang)
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