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58 lines
2.1 KiB
ReStructuredText
58 lines
2.1 KiB
ReStructuredText
.. highlight:: c
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.. _building:
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*****************************
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Building C and C++ Extensions
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*****************************
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A C extension for CPython is a shared library (e.g. a ``.so`` file on Linux,
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``.pyd`` on Windows), which exports an *initialization function*.
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To be importable, the shared library must be available on :envvar:`PYTHONPATH`,
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and must be named after the module name, with an appropriate extension.
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When using setuptools, the correct filename is generated automatically.
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The initialization function has the signature:
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.. c:function:: PyObject* PyInit_modulename(void)
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It returns either a fully initialized module, or a :c:type:`PyModuleDef`
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instance. See :ref:`initializing-modules` for details.
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.. highlight:: python
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For modules with ASCII-only names, the function must be named
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``PyInit_<modulename>``, with ``<modulename>`` replaced by the name of the
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module. When using :ref:`multi-phase-initialization`, non-ASCII module names
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are allowed. In this case, the initialization function name is
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``PyInitU_<modulename>``, with ``<modulename>`` encoded using Python's
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*punycode* encoding with hyphens replaced by underscores. In Python::
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def initfunc_name(name):
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try:
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suffix = b'_' + name.encode('ascii')
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except UnicodeEncodeError:
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suffix = b'U_' + name.encode('punycode').replace(b'-', b'_')
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return b'PyInit' + suffix
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It is possible to export multiple modules from a single shared library by
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defining multiple initialization functions. However, importing them requires
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using symbolic links or a custom importer, because by default only the
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function corresponding to the filename is found.
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See the *"Multiple modules in one library"* section in :pep:`489` for details.
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.. highlight:: c
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.. _install-index:
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.. _setuptools-index:
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Building C and C++ Extensions with setuptools
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=============================================
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Python 3.12 and newer no longer come with distutils. Please refer to the
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``setuptools`` documentation at
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https://setuptools.readthedocs.io/en/latest/setuptools.html
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to learn more about how build and distribute C/C++ extensions with setuptools.
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