PG Bug reporting form <noreply(at)postgresql(dot)org> writes:
> -fgnuc-version flag used to disable __builtin_xx functions in
> PotgreSQLv14.2
We do not support that, and I don't see any very good reason why
we should. If you want to use some other compiler, then do so,
but if you're on gcc then what's wrong with using its builtins?
regards, tom lane