diff options
Diffstat (limited to 'Lib/distutils/command/build_ext.py')
| -rw-r--r-- | Lib/distutils/command/build_ext.py | 68 |
1 files changed, 52 insertions, 16 deletions
diff --git a/Lib/distutils/command/build_ext.py b/Lib/distutils/command/build_ext.py index acbe648036..54ce13454f 100644 --- a/Lib/distutils/command/build_ext.py +++ b/Lib/distutils/command/build_ext.py @@ -4,7 +4,10 @@ Implements the Distutils 'build_ext' command, for building extension modules (currently limited to C extensions, should accommodate C++ extensions ASAP).""" -import sys, os, re +import contextlib +import os +import re +import sys from distutils.core import Command from distutils.errors import * from distutils.sysconfig import customize_compiler, get_python_version @@ -85,6 +88,8 @@ class build_ext(Command): "forcibly build everything (ignore file timestamps)"), ('compiler=', 'c', "specify the compiler type"), + ('parallel=', 'j', + "number of parallel build jobs"), ('swig-cpp', None, "make SWIG create C++ files (default is C)"), ('swig-opts=', None, @@ -124,6 +129,7 @@ class build_ext(Command): self.swig_cpp = None self.swig_opts = None self.user = None + self.parallel = None def finalize_options(self): from distutils import sysconfig @@ -134,6 +140,7 @@ class build_ext(Command): ('compiler', 'compiler'), ('debug', 'debug'), ('force', 'force'), + ('parallel', 'parallel'), ('plat_name', 'plat_name'), ) @@ -274,6 +281,12 @@ class build_ext(Command): self.library_dirs.append(user_lib) self.rpath.append(user_lib) + if isinstance(self.parallel, str): + try: + self.parallel = int(self.parallel) + except ValueError: + raise DistutilsOptionError("parallel should be an integer") + def run(self): from distutils.ccompiler import new_compiler @@ -442,15 +455,45 @@ class build_ext(Command): def build_extensions(self): # First, sanity-check the 'extensions' list self.check_extensions_list(self.extensions) + if self.parallel: + self._build_extensions_parallel() + else: + self._build_extensions_serial() + + def _build_extensions_parallel(self): + workers = self.parallel + if self.parallel is True: + workers = os.cpu_count() # may return None + try: + from concurrent.futures import ThreadPoolExecutor + except ImportError: + workers = None + + if workers is None: + self._build_extensions_serial() + return + + with ThreadPoolExecutor(max_workers=workers) as executor: + futures = [executor.submit(self.build_extension, ext) + for ext in self.extensions] + for ext, fut in zip(self.extensions, futures): + with self._filter_build_errors(ext): + fut.result() + def _build_extensions_serial(self): for ext in self.extensions: - try: + with self._filter_build_errors(ext): self.build_extension(ext) - except (CCompilerError, DistutilsError, CompileError) as e: - if not ext.optional: - raise - self.warn('building extension "%s" failed: %s' % - (ext.name, e)) + + @contextlib.contextmanager + def _filter_build_errors(self, ext): + try: + yield + except (CCompilerError, DistutilsError, CompileError) as e: + if not ext.optional: + raise + self.warn('building extension "%s" failed: %s' % + (ext.name, e)) def build_extension(self, ext): sources = ext.sources @@ -502,15 +545,8 @@ class build_ext(Command): extra_postargs=extra_args, depends=ext.depends) - # XXX -- this is a Vile HACK! - # - # The setup.py script for Python on Unix needs to be able to - # get this list so it can perform all the clean up needed to - # avoid keeping object files around when cleaning out a failed - # build of an extension module. Since Distutils does not - # track dependencies, we have to get rid of intermediates to - # ensure all the intermediates will be properly re-built. - # + # XXX outdated variable, kept here in case third-part code + # needs it. self._built_objects = objects[:] # Now link the object files together into a "shared object" -- |