Craig Ringer <> writes:
> On 18 October 2016 at 04:19, Andres Freund <> wrote:
>> On 2016-10-17 16:16:37 -0400, Robert Haas wrote:
>>> I wouldn't think that cross-file references would be especially
>>> common.  Functions that take PG_FUNCTION_ARGS and return Datum aren't
>>> a lot of fun to call from C.  But maybe I'm wrong.

>> There's a fair number of DirectFunctionCall$Ns over the backend.

> It's only an issue if one contrib calls another contrib (or the core
> backend code calls into a contrib, but that's unlikely) via
> DirectFunctionCall .

No, it's cross *file* references within a single contrib module that
would be likely to need extern declarations in a header file.  That's
not especially weird IMO.  I'm not sure how many cases there actually
are though.

                        regards, tom lane

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