[PATCH 1 of 7 V2] util: add a macro initializing CPython modules

[Yuya Nishihara]

On Sat, 13 May 2017 11:55:23 -0700, Jun Wu wrote:
> # HG changeset patch
> # User Jun Wu <quark at fb.com>
> # Date 1494288921 25200
> #      Mon May 08 17:15:21 2017 -0700
> # Node ID 55ae1324c950e76270ccb0f68c098513bc36fc91
> # Parent  78496ac300255e9996b3e282086661afc08af37c
> # Available At https://bitbucket.org/quark-zju/hg-draft
> #              hg pull https://bitbucket.org/quark-zju/hg-draft -r 55ae1324c950
> util: add a macro initializing CPython modules

> +#define PYMODULEINIT(name, methods, doc, version, precheck, postinit) \
> +	PyMODINIT_FUNC (init ## name)(void) \
> +	{ \
> +		PyObject *m; \
> +		if ((precheck) == -1) \
> +			return; \
> +		m = Py_InitModule3(#name, methods, doc); \
> +		if (m == NULL) \
> +			return; \
> +		if (PyModule_AddIntConstant(m, "version", version) == -1) \
> +			return; \
> +		(void)postinit; \
> +	}
> +#endif

Maybe I'm a bit conservative about a macro use, but my concern here is, it's
so easy to make postinint never be called.

  PYMODULEINIT(parsers, methods, parsers_doc, 1, check_python_version(),
               module_init)