Re: Avoid circular header file dependency

Tom Lane <tgl@sss.pgh.pa.us>

From: Tom Lane <tgl@sss.pgh.pa.us>
To: Bertrand Drouvot <bertranddrouvot.pg@gmail.com>
Cc: PostgreSQL Hackers <pgsql-hackers@postgresql.org>
Date: 2025-04-27T15:46:10Z
Lists: pgsql-hackers
Bertrand Drouvot <bertranddrouvot.pg@gmail.com> writes:
> On Sat, Apr 26, 2025 at 02:55:51PM -0400, Tom Lane wrote:
>> I think the actual problem is that plpython.h
>> does this:
>> 
>> /*
>> * Used throughout, so it's easier to just include it everywhere.
>> */
>> #include "plpy_util.h"

> Agree.

>> which is exactly the sort of cowboy modularity violation that hurts
>> when you have to clean it up.  Taking that out requires having to
>> manually include plpy_util.h in all the relevant .c files, but on
>> the other hand we can remove their vestigial direct inclusions of
>> plpython.h.

> Yeah, makes sense. I checked the s/plpython.h/plpy_util.h/ replacements and
> the includes alphabetical ordering is still preserved. Also misc-header-include-cycle
> is now happy so LGTM.

Pushed, thanks for reviewing.  I'll leave the wait_event.h issue
to Michael.

			regards, tom lane



Commits

  1. Remove circular #include's between wait_event.h and wait_event_types.h

  2. Remove circular #include's between plpython.h and plpy_util.h.