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

On Mon, Jan 27, 2020 at 2:02 PM Mahendra Singh Thalor
<mahi6run(at)gmail(dot)com> wrote:
> I can see one warning on HEAD.
>
> jsonapi.c: In function ‘json_errdetail’:
> jsonapi.c:1068:1: warning: control reaches end of non-void function
> [-Wreturn-type]
> }
> ^
>
> Attaching a patch to fix warning.

Hmm, I don't get a warning there. This function is a switch over an
enum type with a case for every value of the enum, and every branch
either does a "return" or an "elog," so any code after the switch
should be unreachable. It's possible your compiler is too dumb to know
that, but I thought there were other places in the code base where we
assumed that if we handled every defined value of enum, that was good
enough.

But maybe not. I found similar coding in CreateDestReceiver(), and
that ends with:

/* should never get here */
pg_unreachable();

So perhaps we need the same thing here. Does adding that fix it for you?

--
Robert Haas
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