Uninitilised variable detection in C++

[naveen yadav]

Hi
I am using GNU compiler and i enable all warnings still i do not get any
warning.
Is there any way to get warning for uninitilised variables in c++ .

class Foo
{
private:
  int m_nValue;
public:
  Foo();
  int GetValue() { return m_bValue; }
};
Foo::Foo()
{
  // Oops, we forget to initialize m_nValue
}
int main()
{
  Foo cFoo;
  if (cFoo.GetValue() > 0)
      // do something
  else
      // do something else
}
Best regards
naveen