[Cython] Proposal: extern implementations of functions

[Jeroen Demeyer]

Hello Cython developers,

I would like to propose a new mechanism to implement functions in an 
external .c file. The goal is to solve the problem I was having in
https://groups.google.com/forum/#!topic/cython-users/TsbBNyvwZn4

With the attached patch, you can do the following:

* in foo.pxd, declare the function as usual:
cdef void myfunc()

* in foo.c, actually implement the function:
static void myfunc()
{
     /* ... */
}

* in foo.pyx, declare the function extern:
cdef extern from "foo.c":
     void myfunc()

With my patch, the extern declaration in foo.pyx will be interpreted as 
implementing the function. Therefore, myfunc() is now available in the 
module foo, and it can also be cimported by other modules.

What do you think of this proposed feature?


Jeroen.
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