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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"""