141 lines
5.1 KiB
Python
141 lines
5.1 KiB
Python
import re
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import functools
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import distutils.core
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import distutils.errors
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import distutils.extension
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from .monkey import get_unpatched
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def _have_cython():
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"""
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Return True if Cython can be imported.
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"""
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cython_impl = 'Cython.Distutils.build_ext'
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try:
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# from (cython_impl) import build_ext
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__import__(cython_impl, fromlist=['build_ext']).build_ext
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return True
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except Exception:
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pass
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return False
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# for compatibility
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have_pyrex = _have_cython
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_Extension = get_unpatched(distutils.core.Extension)
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class Extension(_Extension):
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"""
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Describes a single extension module.
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This means that all source files will be compiled into a single binary file
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``<module path>.<suffix>`` (with ``<module path>`` derived from ``name`` and
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``<suffix>`` defined by one of the values in
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``importlib.machinery.EXTENSION_SUFFIXES``).
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In the case ``.pyx`` files are passed as ``sources and`` ``Cython`` is **not**
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installed in the build environment, ``setuptools`` may also try to look for the
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equivalent ``.cpp`` or ``.c`` files.
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:arg str name:
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the full name of the extension, including any packages -- ie.
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*not* a filename or pathname, but Python dotted name
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:arg list[str] sources:
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list of source filenames, relative to the distribution root
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(where the setup script lives), in Unix form (slash-separated)
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for portability. Source files may be C, C++, SWIG (.i),
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platform-specific resource files, or whatever else is recognized
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by the "build_ext" command as source for a Python extension.
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:keyword list[str] include_dirs:
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list of directories to search for C/C++ header files (in Unix
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form for portability)
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:keyword list[tuple[str, str|None]] define_macros:
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list of macros to define; each macro is defined using a 2-tuple:
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the first item corresponding to the name of the macro and the second
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item either a string with its value or None to
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define it without a particular value (equivalent of "#define
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FOO" in source or -DFOO on Unix C compiler command line)
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:keyword list[str] undef_macros:
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list of macros to undefine explicitly
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:keyword list[str] library_dirs:
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list of directories to search for C/C++ libraries at link time
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:keyword list[str] libraries:
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list of library names (not filenames or paths) to link against
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:keyword list[str] runtime_library_dirs:
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list of directories to search for C/C++ libraries at run time
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(for shared extensions, this is when the extension is loaded)
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:keyword list[str] extra_objects:
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list of extra files to link with (eg. object files not implied
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by 'sources', static library that must be explicitly specified,
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binary resource files, etc.)
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:keyword list[str] extra_compile_args:
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any extra platform- and compiler-specific information to use
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when compiling the source files in 'sources'. For platforms and
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compilers where "command line" makes sense, this is typically a
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list of command-line arguments, but for other platforms it could
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be anything.
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:keyword list[str] extra_link_args:
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any extra platform- and compiler-specific information to use
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when linking object files together to create the extension (or
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to create a new static Python interpreter). Similar
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interpretation as for 'extra_compile_args'.
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:keyword list[str] export_symbols:
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list of symbols to be exported from a shared extension. Not
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used on all platforms, and not generally necessary for Python
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extensions, which typically export exactly one symbol: "init" +
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extension_name.
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:keyword list[str] swig_opts:
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any extra options to pass to SWIG if a source file has the .i
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extension.
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:keyword list[str] depends:
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list of files that the extension depends on
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:keyword str language:
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extension language (i.e. "c", "c++", "objc"). Will be detected
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from the source extensions if not provided.
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:keyword bool optional:
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specifies that a build failure in the extension should not abort the
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build process, but simply not install the failing extension.
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"""
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def __init__(self, name, sources, *args, **kw):
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# The *args is needed for compatibility as calls may use positional
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# arguments. py_limited_api may be set only via keyword.
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self.py_limited_api = kw.pop("py_limited_api", False)
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super().__init__(name, sources, *args, **kw)
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def _convert_pyx_sources_to_lang(self):
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"""
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Replace sources with .pyx extensions to sources with the target
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language extension. This mechanism allows language authors to supply
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pre-converted sources but to prefer the .pyx sources.
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"""
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if _have_cython():
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# the build has Cython, so allow it to compile the .pyx files
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return
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lang = self.language or ''
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target_ext = '.cpp' if lang.lower() == 'c++' else '.c'
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sub = functools.partial(re.sub, '.pyx$', target_ext)
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self.sources = list(map(sub, self.sources))
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class Library(Extension):
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"""Just like a regular Extension, but built as a library instead"""
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