Why does C++ not allow inherited friendship?

Question

Why is friendship not at least optionally inheritable in C++? I understand transitivity and reflexivity being forbidden for obvious reasons (I say this only to head off sim

Answer 1

Friend function in a class assigns the extern property to the function. i.e. extern means that the function has been declared and defined somewhere out of the class.

Hence it means friend function is not a member of a class. So the inheritance only allows you to inherit the properties of a class not external things. And also if inheritance is allowed for friend functions, then a third party class inheriting.