How to bind friend operators in GCC?

The following binding definitions works in MS VC++.

          .def("__mul", (vector3 (*)(matrix3 const& a, vector3 const&
b))&operator*)
          .def("__mul", (vector3 (*)(vector3 const& b, matrix3 const&
a))&operator*)
          .def("__mul", (matrix3 (*)(matrix3 const& a, matrix3 const&
b))&operator*)

class matrix3
{
...
    friend vector3 operator*(matrix3 const& a, vector3 const& b);
    friend vector3 operator*(vector3 const& b, matrix3 const& a);
    friend matrix3 operator*(matrix3 const& a, matrix3 const& b)    {
matrix3 c; c.mult(a,b); return c;}
...
};

However the same binding gives an error message in GCC.

 error: address of overloaded function with no contextual type information

I am not familiar with GCC nor am sure if the binding definition is standard
C++ or not.
But is there any way work around this (other than writing a wrapper
function)?

Thanks,

Taesoo.

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