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extension.py
import re import functools import distutils.core import distutils.errors import distutils.extension from .monkey import get_unpatched def _have_cython(): """ Return True if Cython can be imported. """ cython_impl = 'Cython.Distutils.build_ext' try: # from (cython_impl) import build_ext __import__(cython_impl, fromlist=['build_ext']).build_ext return True except Exception: pass return False # for compatibility have_pyrex = _have_cython _Extension = get_unpatched(distutils.core.Extension) class Extension(_Extension): """ Describes a single extension module. This means that all source files will be compiled into a single binary file ``<module path>.<suffix>`` (with ``<module path>`` derived from ``name`` and ``<suffix>`` defined by one of the values in ``importlib.machinery.EXTENSION_SUFFIXES``). In the case ``.pyx`` files are passed as ``sources and`` ``Cython`` is **not** installed in the build environment, ``setuptools`` may also try to look for the equivalent ``.cpp`` or ``.c`` files. :arg str name: the full name of the extension, including any packages -- ie. *not* a filename or pathname, but Python dotted name :arg list[str] sources: 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. :keyword list[str] include_dirs: list of directories to search for C/C++ header files (in Unix form for portability) :keyword list[tuple[str, str|None]] define_macros: list of macros to define; each macro is defined using a 2-tuple: the first item corresponding to the name of the macro and the second item either a string with its value or None to define it without a particular value (equivalent of "#define FOO" in source or -DFOO on Unix C compiler command line) :keyword list[str] undef_macros: list of macros to undefine explicitly :keyword list[str] library_dirs: list of directories to search for C/C++ libraries at link time :keyword list[str] libraries: list of library names (not filenames or paths) to link against :keyword list[str] runtime_library_dirs: list of directories to search for C/C++ libraries at run time (for shared extensions, this is when the extension is loaded). Setting this will cause an exception during build on Windows platforms. :keyword list[str] extra_objects: 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.) :keyword list[str] extra_compile_args: 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. :keyword list[str] extra_link_args: 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'. :keyword list[str] export_symbols: 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. :keyword list[str] swig_opts: any extra options to pass to SWIG if a source file has the .i extension. :keyword list[str] depends: list of files that the extension depends on :keyword str language: extension language (i.e. "c", "c++", "objc"). Will be detected from the source extensions if not provided. :keyword bool optional: specifies that a build failure in the extension should not abort the build process, but simply not install the failing extension. :keyword bool py_limited_api: opt-in flag for the usage of :doc:`Python's limited API <python:c-api/stable>`. :raises setuptools.errors.PlatformError: if 'runtime_library_dirs' is specified on Windows. (since v63) """ def __init__(self, name, sources, *args, **kw): # The *args is needed for compatibility as calls may use positional # arguments. py_limited_api may be set only via keyword. self.py_limited_api = kw.pop("py_limited_api", False) super().__init__(name, sources, *args, **kw) def _convert_pyx_sources_to_lang(self): """ Replace sources with .pyx extensions to sources with the target language extension. This mechanism allows language authors to supply pre-converted sources but to prefer the .pyx sources. """ if _have_cython(): # the build has Cython, so allow it to compile the .pyx files return lang = self.language or '' target_ext = '.cpp' if lang.lower() == 'c++' else '.c' sub = functools.partial(re.sub, '.pyx$', target_ext) self.sources = list(map(sub, self.sources)) class Library(Extension): """Just like a regular Extension, but built as a library instead"""
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