cython

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PYTHON setup.py build_ext --inplace
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PYTHON -c "import foo"
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PYTHON -c "import a"
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PYTHON -c "import b"
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######## setup.py ########
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from Cython.Build import cythonize
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from distutils.core import setup
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setup(
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  ext_modules = cythonize("*.pyx"),
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)
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######## foo.pxd ########
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cdef int bar() except *
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cdef extern from "bar_impl.c":
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    struct mystruct:
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        int (*func_ptr)(int param) nogil
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######## foo.pyx ########
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cdef extern from "bar_impl.c":
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    int bar() except *
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######## bar_impl.c ########
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static int bar() { return -1; }
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typedef struct mystruct {
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  int (*func_ptr)(int param);
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} mystruct_t;
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######## a.pyx ########
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cimport cython
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from foo cimport bar
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assert bar() == -1
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######## b.pyx ########
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from foo cimport mystruct
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cdef int cb(int param) noexcept nogil:
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    return param
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cdef mystruct ms = mystruct(&cb)
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assert ms.func_ptr(5) == 5
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