Do wcout and wcin work with GCC?

["Alex J. Dam" <alexjotadam at yahoo dot com dot br>]

 Hi,

 I would like to use C++ as my primary language for computer
programming, but I'm having some problems dealing with
multi-byte strings in g++.
 How can I make wcin and wcout work? Whenever I read a string
from the console the string is truncated at the first non-ASCII
character. When I'm writing to wcout, the string is also
truncated.
 I've tried imbue(), setlocale(), etc. but it didn't solve my
problem.
 My locale is pt_BR.UTF-8, my gcc and g++ are version 3.3.1.
 EXAMPLE:

#include <iostream>
#include <string>
#include <locale>

using namespace std;

int main(){
  locale l("pt_BR.UTF-8");
  setlocale(LC_ALL, "pt_BR.UTF-8");
  locale::global(l);
  wcout.imbue(l);
  wcin.imbue(l);
  wstring s;
  wcin >> s;
  wcout << s.length() << endl;
}

Some output:
$ ./prog
arboris
7
$ ./prog
Ãrvore
0

 Any help?

 Alex