missing symbols

[costin_c]

In the following code, compiled with
g++   cls.cc -Wall -W -g3 -o cls

why only only virtual functions  f1, f2 and constructor is listed by nm.

Only debugging symbols for virtual functions are included in
executable output file ?

//cls.cc
#include <iostream>
using namespace std;

class test
{
public:
    int u;
    test(int t){u=t;};
    virtual void f1(){
    cout <<u<<endl;
    }
    virtual void f2(int t){u=t;};
    void f3(int t){u=t;};

};

int main(int argc, char **argv)
{
    test t(100);

}
$nm -C  cls | grep test::

0804874e W test::f1()
08048740 W test::f2(int)
08048728 W test::test(int)