Re: making the backend's json parser work in frontend code

Robert Haas <robertmhaas@gmail.com> writes:
> On Tue, Jan 28, 2020 at 11:35 AM Tom Lane <tgl@sss.pgh.pa.us> wrote:
>> 3. Some compilers still don't understand that elog(ERROR) doesn't
>> return, so you need a dummy return.  Perhaps pg_unreachable()
>> would do as well, but project style has been the dummy return for
>> a long time ... and I'm not entirely convinced by the assumption
>> that every compiler understands pg_unreachable(), anyway.

> Is the example of CreateDestReceiver() sufficient to show that this is
> not a problem in practice?

Dunno.  I don't see any warnings about that in the buildfarm, but
that's not a very large sample of non-gcc compilers.

Another angle here is that on non-gcc compilers, pg_unreachable()
is going to expand to an abort() call, which is likely to eat more
code space than a dummy "return 0".

            regards, tom lane