Is it undefined behavior to take the address of an uninitialized pointer?

Question

N1570 states that this is undefined behavior:

§J.2/1 The value of an object with automatic storage duration is used while it is indeterminate (6.2.4

Answer 1

In this expression:

&ptr

the address of the & operand, i. e., the address of the ptr object is yielded but the ptr object is never evaluated.

(C11, 6.3.2.1p2) "Except when it is the operand of the sizeof operator, the unary & operator, the ++ operator, the -- operator, or the left operand of the . operator or an assignment operator, an lvalue that does not have array type is converted to the value stored in the designated object (and is no longer an lvalue); this is called lvalue conversion."