Can deduced return type of member function be used as default argument value of a friend function template?

In the program as follows, static function A::f has an automatically deduced return type. Despite it is defined in the code before its usage in default template parameter class T = decltype(A::f()):

struct A{
    static auto f() {}
    template<class T = decltype(A::f())>
    friend void g(A) {}
};

int main(){
    g(A{});
}

Clang refuses the program with the error:

function 'f' with deduced return type cannot be used before it is defined

while GCC is fine with the code, demo: https://gcc.godbolt.org/z/5Tc879od8

Which compiler is right here?