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

No. It's not undefined behaviour. Only ptr is uninitialized and has indeterminate value but &ptr has a proper value.

What the standard quote on strtol says:

...If the subject sequence is empty or does not have the expected form, no conversion is performed; the value of nptr is stored in the object pointed to by endptr, provided that endptr is not a null pointer.

That above quote is talks about a call like this:

strtol(str, 0, 10);

The call in the man page and the linked answer are perfectly fine.