cython

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PYTHON setup.py build_ext --inplace
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PYTHON -c "import a"
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# Rebuild it with a flag to pretend we're on a platform where sizeof(function_ptr) != sizeof(void*)
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PYTHON setup_large_func_pointers.py build_ext --inplace --force
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PYTHON -c "import a"
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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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######## setup_large_func_pointers.py ########
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from Cython.Build import cythonize
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from distutils.core import setup, Extension
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setup(
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  ext_modules = cythonize(Extension("*", ["*.pyx"],
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                                    extra_compile_args=["-D__Pyx_TEST_large_func_pointers=1"])),
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)
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######## other.pxd ########
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cdef class A:
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    pass
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cdef int foo(int)
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######## other.pyx ########
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cdef class A:
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    pass
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cdef int foo(int a):
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     return a**2
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######## pkg/__init__.py ########
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######## pkg/sub.pxd ########
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ctypedef int my_int
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######## pkg/subpkg/__init__.py ########
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######## pkg/subpkg/submod.pxd ########
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ctypedef int my_int
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######## a.pyx ########
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from other cimport (
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    A,
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    foo,
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)
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print(A, foo(10))
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cimport other
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cdef call_fooptr(int (*fptr)(int)):
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    return fptr(10)
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def call_other_foo():
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    x = other.foo  # GH4000 - failed because other was untyped
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    return call_fooptr(x) # check that x is correctly resolved as a function pointer
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print(other.A, other.foo(10), call_other_foo())
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from pkg cimport sub
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cdef sub.my_int a = 100
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from pkg.subpkg cimport submod
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