compiling for Python

[almeida]

I all!!
I'm doing the introductory example of Swig, compiling a C code to  
include in Python. The sources file are:

/* File : example.c */

double My_variable = 3.0;

/* Compute factorial of n */
int fact(int n) {
        if (n <= 1) return 1;
        else return n*fact(n-1);
}

/* Compute n mod m */
int my_mod(int n, int m) {
        return(n % m);
}
---------------------------------
/* File : example.i */
%module example

%{
/* Put headers and other declarations here */
extern double My_variable;
extern int    fact(int);
extern int    my_mod(int n, int m);
%}

extern double My_variable;
extern int    fact(int);
extern int    my_mod(int n, int m);

Then i wrote:
swig -python example.i
gcc -c -fpic example.c example_wrap.c -I/usr/include/python2.5
gcc -shared example.o example_wrap.o -o _example.so

Then, in the python console, when i import the module, i get this:
>>> import example
Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
ImportError: ./example.so: wrong ELF class: ELFCLASS64

What's wrong? What's that mean?

I hope you help me...

Thanks








--
Lic. Yasser Almeida Hernández
Center of Molecular Inmunology (CIM)
Nanobiology Group
P.O.Box 16040, Havana 11600, Cuba
Phone: [phone], ext. 221

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Correo FENHI




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[Josh Cherry]

On Thu, 1 Oct 2009, Yasser Almeida Hernández wrote:

> Then i wrote:
> swig -python example.i
> gcc -c -fpic example.c example_wrap.c -I/usr/include/python2.5
> gcc -shared example.o example_wrap.o -o _example.so
>
> Then, in the python console, when i import the module, i get this:
>>>> import example
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> ImportError: ./example.so: wrong ELF class: ELFCLASS64

Since you're naming your shared library _example.so (as you should), there
shouldn't be any example.so to import.  You must have a different library
named example.so in your directory (or somewhere else on your Python path)
that takes precedence over example.py.  It might be a 64-bit library that
you're unintentionally loading into 32-bit Python, but in any case it's
going to cause you trouble.

Josh

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