[Pyrex] How to use C functions in many Pyrex files?

[Tomasz Primke]

> If you want to have the literal equivalent of a C include, you can use:
>
>     include "p1.pyx"
>
> Wherever you want to use that function.

I'm not sure, what do you mean by "literal equivalent", so I'll try to 
describe what I want to achieve.

I have a Pyrex module, called p1 (p1.pyx). I can "compile" it with pyrexc, 
so I'll get p1.c file. The file is then used to make a Python extension 
module, with my setup.py file - so I get the p1.so file (I work on a 
GNU/Linux box).

Now: I have also other Pyrex modules, called p2 (p2.pyx), p3 (p3.pyx), and 
so on. I want to use that C_function function, defined in the p1 module, in 
my p2.pyx, p3.pyx (and so on) files (modules). In general: p2, p3 modules 
should use some functions from the p1 module. Or in another words: I need 
my modules to *share* some C (Pyrex) functions.

I have already tried:

--- p1.pyx file ---
cdef public void C_function( int i ):
  print "i =", i

--- p2.pyx file ---
#include "p1.pxi"

def Cfun( int ):
  C_function( i )



And I was able to compile it and make Python modules (p1.so and p2.so), but 
when I did:

>>> import p2

I got some message about unresolved symbols or something... In general - 
Python wasn't able to find out, that the p1.so shared library should be 
also loaded (because it has the needed functionality).


I realize, that I could do just:

#include "p1.pyx"


but wouldn't it cause code duplication in p2.so file? In the real life my 
modules will be much more complicated, so the code duplication is not a 
good idea...


Best regards,

	Tomek