Re: More const-marking cleanup

Hi,

On Fri, Dec 05, 2025 at 03:52:40PM -0500, Tom Lane wrote:
> I wrote:
> > Ah. Your script didn't notice the need for const'ification of
> > additional variables in map_locale() :-(.

Ah, right, thanks for letting me know. It would need more work to catch those.

That said I improved the script [1] so that:

- It found one more (see the attached)
- It is able to detect cases even for functions created in the code tree. It found
that skip_drive() (path.c) and bsearch_arg() (bsearch_arg.c) are also functions
that cast away const in their return values
- It also checked callers for the 2 functions above and did not find const to add

> Adding these comments feels a bit like putting lipstick on a pig.
> find_variable and its subroutines are an inelegant, duplicative
> mess that fails to handle cases it easily could handle if it were
> rewritten. But I've put enough brain cells into this already,
> and also it appears that there are restrictions elsewhere in ecpg
> that'd have to be lifted before it'd make a difference.

I also look at those (even if already pushed in 4eda42e8bdf) and they LGTM.

[1]: https://github.com/bdrouvot/coccinelle_on_pg/blob/main/misc/indirectly_casting_away_const.cocci

Regards,

--
Bertrand Drouvot
PostgreSQL Contributors Team
RDS Open Source Databases
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