============**************==============
Error :
gcc -shared sum.o -o sum.so
/usr/bin/ld: crti.o: No such file: No such file or directory
collect2: ld returned 1 exit status

Error :
cdll.LoadLibrary(’sum.so’)
Traceback (most recent call last):
File “”, line 1, in
File “ctypes/__init__.py”, line 431, in LoadLibrary
File “ctypes/__init__.py”, line 348, in __init__
OSError: sum.so: cannot open shared object file: No such file or directory
=======***************==========
Solution to those problems
********==============*****************
For both OS
let’s say myfunction.c
int area_rect(int length, int breadth)
{
return length*breadth;
}

$ gcc -fPIC -c myfunction.c
$ gcc -shared myfunction.o -o myfunction.so
Note in Ubuntu i had error described in head, so i used
$ ld -shared myfunction.o -o myfunction.so
$ export LD_LIBRARY_PATH=$ # use it in ubuntu to describe the path
In windows, you can add the location in System variable path. Search in web, if you cannot.
Now use python
$python
>>>from ctypes import *
>>>cdll.LoadLibrary(‘myfunction.so’)

>>> libc = CDLL(‘myfunction.so’)
>>>libc.area_rect(12,34)
Got result ?

Good luck. You did it, enjoy
*************================***************

A compilação é feita com o compilador ICC, que é da Intel.

Mas quando você compila com o gcc, as flags de compilação do kernel não são lidas do make.conf =/

Porém, no meu sistema eu compilo com -O3 mesmo, embora, a otimização nem sempre aconteça e os binários ficam muito maiores.

Is there some way to benchmark the performance improvements?
-R

http://www.kanbal.com/index.php?/Electronics/sony-flex-vaio-contrast-the-foldable-laptop.html