Re: GUC values - recommended way to declare the C variables?

On Thu, Oct 27, 2022 at 1:33 PM Michael Paquier <michael@paquier.xyz> wrote:
>
>...
>
> Anyway, per my previous comments in my last message of this thread as
> of https://www.postgresql.org/message-id/Y1nnwFTrnL3ItleP@paquier.xyz,
> I don't see a need for DYNAMIC_DEFAULT from the other thread, nor do I
> see a need to a style like that:
> +/* GUC variable */
> +bool           update_process_title =
> +#ifdef WIN32
> +               false;
> +#else
> +               true;
> +#endif
>
> I think that it would be cleaner to use the same approach as
> checking_after_flush and similar GUCs with a centralized definition,
> rather than spreading such style in two places for each GUC that this
> patch touches (aka its declaration and its default value in
> guc_tables.c).  In any case, the patch of this thread still needs some
> adjustments IMO.

PSA patch v6.

The GUC defaults of guc_tables.c, and the modified GUC C var
declarations now share the same common #define'd value (instead of
cut/paste preprocessor code).

Per Michael's suggestion [1] to use centralized definitions.

------
[1] https://www.postgresql.org/message-id/Y1nuDNZDncx7%2BA1j%40paquier.xyz

Kind Regards,
Peter Smith.
Fujitsu Australia