@aburka ...Running it, printf will attempt to find a format string at location 72 of the memory. And crash.

There are helpers in GCC for printf, but currently they only check if *the static string* is a proper format and match the argument. They currently cannot check that the wrong type (a character instead of a string) was provided.
C++ is more peeky about types and would probably complain about not converting int to pointer, but still no explanation why 'H' is considered int.