cpython/Lib/distutils/extension.py

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"""distutils.extension
Provides the Extension class, used to describe C/C++ extension
modules in setup scripts."""
__revision__ = "$Id$"
import os
import warnings
# This class is really only used by the "build_ext" command, so it might
# make sense to put it in distutils.command.build_ext. However, that
# module is already big enough, and I want to make this class a bit more
# complex to simplify some common cases ("foo" module in "foo.c") and do
# better error-checking ("foo.c" actually exists).
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#
# Also, putting this in build_ext.py means every setup script would have to
# import that large-ish module (indirectly, through distutils.core) in
# order to do anything.
class Extension:
"""Just a collection of attributes that describes an extension
module and everything needed to build it (hopefully in a portable
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way, but there are hooks that let you be as unportable as you need).
Instance attributes:
name : string
the full name of the extension, including any packages -- ie.
*not* a filename or pathname, but Python dotted name
sources : [string]
list of source filenames, relative to the distribution root
(where the setup script lives), in Unix form (slash-separated)
for portability. Source files may be C, C++, SWIG (.i),
platform-specific resource files, or whatever else is recognized
by the "build_ext" command as source for a Python extension.
include_dirs : [string]
list of directories to search for C/C++ header files (in Unix
form for portability)
define_macros : [(name : string, value : string|None)]
list of macros to define; each macro is defined using a 2-tuple,
where 'value' is either the string to define it to or None to
define it without a particular value (equivalent of "#define
FOO" in source or -DFOO on Unix C compiler command line)
undef_macros : [string]
list of macros to undefine explicitly
library_dirs : [string]
list of directories to search for C/C++ libraries at link time
libraries : [string]
list of library names (not filenames or paths) to link against
runtime_library_dirs : [string]
list of directories to search for C/C++ libraries at run time
(for shared extensions, this is when the extension is loaded)
extra_objects : [string]
list of extra files to link with (eg. object files not implied
by 'sources', static library that must be explicitly specified,
binary resource files, etc.)
extra_compile_args : [string]
any extra platform- and compiler-specific information to use
when compiling the source files in 'sources'. For platforms and
compilers where "command line" makes sense, this is typically a
list of command-line arguments, but for other platforms it could
be anything.
extra_link_args : [string]
any extra platform- and compiler-specific information to use
when linking object files together to create the extension (or
to create a new static Python interpreter). Similar
interpretation as for 'extra_compile_args'.
export_symbols : [string]
list of symbols to be exported from a shared extension. Not
used on all platforms, and not generally necessary for Python
extensions, which typically export exactly one symbol: "init" +
extension_name.
swig_opts : [string]
any extra options to pass to SWIG if a source file has the .i
extension.
depends : [string]
list of files that the extension depends on
This patch fixes the following bugs: [#413582] g++ must be called for c++ extensions [#454030] distutils cannot link C++ code with GCC topdir = "Lib/distutils" * bcppcompiler.py (BCPPCompiler.create_static_lib): Fixed prototype, removing extra_preargs and extra_postargs parameters. Included target_lang parameter. (BCPPCompiler.link): Included target_lang parameter. * msvccompiler.py (MSVCCompiler.create_static_lib): Fixed prototype, removing extra_preargs and extra_postargs parameters. Included target_lang parameter. (MSVCCompiler.link): Included target_lang parameter. * ccompiler.py (CCompiler): New language_map and language_order attributes, used by CCompiler.detect_language(). (CCompiler.detect_language): New method, will return the language of a given source, or list of sources. Individual source language is detected using the language_map dict. When mixed sources are used, language_order will stablish the language precedence. (CCompiler.create_static_lib, CCompiler.link, CCompiler.link_executable, CCompiler.link_shared_object, CCompiler.link_shared_lib): Inlcuded target_lang parameter. * cygwinccompiler.py (CygwinCCompiler.link): Included target_lang parameter. * emxccompiler.py (EMXCCompiler.link): Included target_lang parameter. * mwerkscompiler.py (MWerksCompiler.link): Included target_lang parameter. * extension.py (Extension.__init__): New 'language' parameter/attribute, initialized to None by default. If provided will overlap the automatic detection made by CCompiler.detect_language(), in build_ext command. * sysconfig.py (customize_compiler): Check Makefile for CXX option, and also the environment variable CXX. Use the resulting value in the 'compiler_cxx' parameter of compiler.set_executables(). * unixccompiler.py (UnixCCompiler): Included 'compiler_cxx' in executables dict, defaulting to 'cc'. (UnixCCompiler.create_static_lib): Included target_lang parameter. (UnixCCompiler.link): Included target_lang parameter, and made linker command use compiler_cxx, if target_lang is 'c++'. * command/build_ext.py (build_ext.build_extension): Pass new ext.language attribute to compiler.link_shared_object()'s target_lang parameter. If ext.language is not provided, detect language using compiler.detect_language(sources) instead. * command/config.py (config._link): Pass already available lang parameter as target_lang parameter of compiler.link_executable().
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language : string
extension language (i.e. "c", "c++", "objc"). Will be detected
from the source extensions if not provided.
optional : boolean
specifies that a build failure in the extension should not abort the
build process, but simply not install the failing extension.
"""
# When adding arguments to this constructor, be sure to update
# setup_keywords in core.py.
def __init__ (self, name, sources,
include_dirs=None,
define_macros=None,
undef_macros=None,
library_dirs=None,
libraries=None,
runtime_library_dirs=None,
extra_objects=None,
extra_compile_args=None,
extra_link_args=None,
export_symbols=None,
swig_opts = None,
depends=None,
This patch fixes the following bugs: [#413582] g++ must be called for c++ extensions [#454030] distutils cannot link C++ code with GCC topdir = "Lib/distutils" * bcppcompiler.py (BCPPCompiler.create_static_lib): Fixed prototype, removing extra_preargs and extra_postargs parameters. Included target_lang parameter. (BCPPCompiler.link): Included target_lang parameter. * msvccompiler.py (MSVCCompiler.create_static_lib): Fixed prototype, removing extra_preargs and extra_postargs parameters. Included target_lang parameter. (MSVCCompiler.link): Included target_lang parameter. * ccompiler.py (CCompiler): New language_map and language_order attributes, used by CCompiler.detect_language(). (CCompiler.detect_language): New method, will return the language of a given source, or list of sources. Individual source language is detected using the language_map dict. When mixed sources are used, language_order will stablish the language precedence. (CCompiler.create_static_lib, CCompiler.link, CCompiler.link_executable, CCompiler.link_shared_object, CCompiler.link_shared_lib): Inlcuded target_lang parameter. * cygwinccompiler.py (CygwinCCompiler.link): Included target_lang parameter. * emxccompiler.py (EMXCCompiler.link): Included target_lang parameter. * mwerkscompiler.py (MWerksCompiler.link): Included target_lang parameter. * extension.py (Extension.__init__): New 'language' parameter/attribute, initialized to None by default. If provided will overlap the automatic detection made by CCompiler.detect_language(), in build_ext command. * sysconfig.py (customize_compiler): Check Makefile for CXX option, and also the environment variable CXX. Use the resulting value in the 'compiler_cxx' parameter of compiler.set_executables(). * unixccompiler.py (UnixCCompiler): Included 'compiler_cxx' in executables dict, defaulting to 'cc'. (UnixCCompiler.create_static_lib): Included target_lang parameter. (UnixCCompiler.link): Included target_lang parameter, and made linker command use compiler_cxx, if target_lang is 'c++'. * command/build_ext.py (build_ext.build_extension): Pass new ext.language attribute to compiler.link_shared_object()'s target_lang parameter. If ext.language is not provided, detect language using compiler.detect_language(sources) instead. * command/config.py (config._link): Pass already available lang parameter as target_lang parameter of compiler.link_executable().
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language=None,
optional=None,
**kw # To catch unknown keywords
):
if not isinstance(name, str):
raise AssertionError("'name' must be a string")
if not (isinstance(sources, list) and
all(isinstance(v, str) for v in sources)):
raise AssertionError("'sources' must be a list of strings")
self.name = name
self.sources = sources
self.include_dirs = include_dirs or []
self.define_macros = define_macros or []
self.undef_macros = undef_macros or []
self.library_dirs = library_dirs or []
self.libraries = libraries or []
self.runtime_library_dirs = runtime_library_dirs or []
self.extra_objects = extra_objects or []
self.extra_compile_args = extra_compile_args or []
self.extra_link_args = extra_link_args or []
self.export_symbols = export_symbols or []
self.swig_opts = swig_opts or []
self.depends = depends or []
This patch fixes the following bugs: [#413582] g++ must be called for c++ extensions [#454030] distutils cannot link C++ code with GCC topdir = "Lib/distutils" * bcppcompiler.py (BCPPCompiler.create_static_lib): Fixed prototype, removing extra_preargs and extra_postargs parameters. Included target_lang parameter. (BCPPCompiler.link): Included target_lang parameter. * msvccompiler.py (MSVCCompiler.create_static_lib): Fixed prototype, removing extra_preargs and extra_postargs parameters. Included target_lang parameter. (MSVCCompiler.link): Included target_lang parameter. * ccompiler.py (CCompiler): New language_map and language_order attributes, used by CCompiler.detect_language(). (CCompiler.detect_language): New method, will return the language of a given source, or list of sources. Individual source language is detected using the language_map dict. When mixed sources are used, language_order will stablish the language precedence. (CCompiler.create_static_lib, CCompiler.link, CCompiler.link_executable, CCompiler.link_shared_object, CCompiler.link_shared_lib): Inlcuded target_lang parameter. * cygwinccompiler.py (CygwinCCompiler.link): Included target_lang parameter. * emxccompiler.py (EMXCCompiler.link): Included target_lang parameter. * mwerkscompiler.py (MWerksCompiler.link): Included target_lang parameter. * extension.py (Extension.__init__): New 'language' parameter/attribute, initialized to None by default. If provided will overlap the automatic detection made by CCompiler.detect_language(), in build_ext command. * sysconfig.py (customize_compiler): Check Makefile for CXX option, and also the environment variable CXX. Use the resulting value in the 'compiler_cxx' parameter of compiler.set_executables(). * unixccompiler.py (UnixCCompiler): Included 'compiler_cxx' in executables dict, defaulting to 'cc'. (UnixCCompiler.create_static_lib): Included target_lang parameter. (UnixCCompiler.link): Included target_lang parameter, and made linker command use compiler_cxx, if target_lang is 'c++'. * command/build_ext.py (build_ext.build_extension): Pass new ext.language attribute to compiler.link_shared_object()'s target_lang parameter. If ext.language is not provided, detect language using compiler.detect_language(sources) instead. * command/config.py (config._link): Pass already available lang parameter as target_lang parameter of compiler.link_executable().
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self.language = language
self.optional = optional
# If there are unknown keyword options, warn about them
if len(kw) > 0:
options = [repr(option) for option in kw]
options = ', '.join(sorted(options))
msg = "Unknown Extension options: %s" % options
warnings.warn(msg)
def read_setup_file(filename):
"""Reads a Setup file and returns Extension instances."""
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warnings.warn('distutils.extensions.read_setup_file is deprecated. '
'It will be removed in the next Python release.')
_sysconfig = __import__('sysconfig')
from distutils.sysconfig import (expand_makefile_vars,
_variable_rx)
from distutils.text_file import TextFile
from distutils.util import split_quoted
# First pass over the file to gather "VAR = VALUE" assignments.
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vars = _sysconfig._parse_makefile(filename)
# Second pass to gobble up the real content: lines of the form
# <module> ... [<sourcefile> ...] [<cpparg> ...] [<library> ...]
file = TextFile(filename,
strip_comments=1, skip_blanks=1, join_lines=1,
lstrip_ws=1, rstrip_ws=1)
extensions = []
while 1:
line = file.readline()
if line is None: # eof
break
if _variable_rx.match(line): # VAR=VALUE, handled in first pass
continue
if line[0] == line[-1] == "*":
file.warn("'%s' lines not handled yet" % line)
continue
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with warnings.catch_warnings():
warnings.simplefilter("ignore")
line = expand_makefile_vars(line, vars)
words = split_quoted(line)
# NB. this parses a slightly different syntax than the old
# makesetup script: here, there must be exactly one extension per
# line, and it must be the first word of the line. I have no idea
# why the old syntax supported multiple extensions per line, as
# they all wind up being the same.
module = words[0]
ext = Extension(module, [])
append_next_word = None
for word in words[1:]:
if append_next_word is not None:
append_next_word.append(word)
append_next_word = None
continue
suffix = os.path.splitext(word)[1]
switch = word[0:2] ; value = word[2:]
if suffix in (".c", ".cc", ".cpp", ".cxx", ".c++", ".m", ".mm"):
# hmm, should we do something about C vs. C++ sources?
# or leave it up to the CCompiler implementation to
# worry about?
ext.sources.append(word)
elif switch == "-I":
ext.include_dirs.append(value)
elif switch == "-D":
equals = value.find("=")
if equals == -1: # bare "-DFOO" -- no value
ext.define_macros.append((value, None))
else: # "-DFOO=blah"
ext.define_macros.append((value[0:equals],
value[equals+2:]))
elif switch == "-U":
ext.undef_macros.append(value)
elif switch == "-C": # only here 'cause makesetup has it!
ext.extra_compile_args.append(word)
elif switch == "-l":
ext.libraries.append(value)
elif switch == "-L":
ext.library_dirs.append(value)
elif switch == "-R":
ext.runtime_library_dirs.append(value)
elif word == "-rpath":
append_next_word = ext.runtime_library_dirs
elif word == "-Xlinker":
append_next_word = ext.extra_link_args
elif word == "-Xcompiler":
append_next_word = ext.extra_compile_args
elif switch == "-u":
ext.extra_link_args.append(word)
if not value:
append_next_word = ext.extra_link_args
elif suffix in (".a", ".so", ".sl", ".o", ".dylib"):
# NB. a really faithful emulation of makesetup would
# append a .o file to extra_objects only if it
# had a slash in it; otherwise, it would s/.o/.c/
# and append it to sources. Hmmmm.
ext.extra_objects.append(word)
else:
file.warn("unrecognized argument '%s'" % word)
extensions.append(ext)
return extensions