Re: What generates pg_config.h?

Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org> writes:
> Travis Allison wrote:
>> No instance of Postgres 10 running. I took Tom's suggestion: I ran dpkg -S
>> /usr/include/postgresql/pg_config.h
>> Result: libpq-dev: /usr/include/postgresql/pg_config.h

Ah, thanks for clearing that up.

>> Any suggestions on what to do next?

> I wonder if there is a mistake in the use of INCLUDEDIR vs.
> INCLUDEDIR-SERVER for -I. Maybe both are being used, and looks like
> only the latter should be. It seems odd that there are two pg_config.h
> files getting included ...

Yeah ...

> but I do wonder why is there a pg_config.h in libpq-dev.

Now I seem to recall some discussion with a packager who felt that
providing just the latest-and-greatest libpq was sufficient for
clients, and only server-side code needed to depend on the server
version. So I'm betting that the intention on the Ubuntu packager's
end is that you use a -I for /usr/include/postgresql when building
client code, while if you want to build a server extension, you
point at the appropriate version subdirectory. Meanwhile, the
extension Travis is trying to build is unfamiliar with that idea
and is throwing in a bunch of -I switches willy-nilly.

In short, yeah, try removing the -I that's pointing at the upper
directory.

regards, tom lane