It turns out that there is a second target that doesn't define ASM_OUTPUT_ADDR_DIFF_ELT: pdp11. I'll fix that.
The documentation is out of date as a consequence of this patch, because it
still says that ASM_OUTPUT_ADDR_DIFF_ELT is optional which is no longer the
case (or not unless you take some other actions as you did in the VAX port).
paul
