I wrote:
> Several of Andres' buildfarm animals have recently started to whine
> that "performing pointer subtraction with a null pointer has undefined
> behavior" for assorted places in freepage.c.
Ah, sorry, I meant to include a link:
https://buildfarm.postgresql.org/cgi-bin/show_stage_log.pl?nm=mylodon&dt=2022-03-26%2000%3A02%3A10&stg=make
This code is old, but mylodon wasn't doing that a week ago, so
Andres must've updated the compiler and/or changed its options.
kestrel and olingo are reporting it too, but they're new.
regards, tom lane
