Re: Enhance Makefiles to rebuild objects on map file changes

> On Aug 19, 2025, at 23:43, Álvaro Herrera <alvherre(at)kurilemu(dot)de> wrote:
>
> On 2025-Aug-19, Chao Li wrote:
>
>> Hi John,
>>
>> Let me explain the Makefile patch in this separate thread, as this is generic to all maps.
>>
>> Let’s not use gb18030 as an example, instead, using utf8_and_win.
>>
>> When any of the win-related map file changes, it suppose to automatically rebuild utf8_and_win.o.
>>
>> WITHOUT this patch, after I touch a map file, it doesn’t rebuild the object file:
>
> Hmm. Yeah, this really looks somewhat bogus as you say. I wonder
> though if we shouldn't have the UCS_to_*.pl scripts generate a bunch of
> "mapdeps.mk" files instead, or something like that, given that these
> *.map files are themselves generated.
>
> Also, I suspect you should do something about Meson, but I don't know
> what that would look like.
>

Based on Tom’s response in the other thread [1], this is a problem with make, it’s worth fixing.

As suggested by Alvaro, I will study on the “mapdepds.mk” direction a little bit.

[1] https://www.postgresql.org/message-id/2814142.1759983649%40sss.pgh.pa.us

Best regards,
--
Chao Li (Evan)
HighGo Software Co., Ltd.
https://www.highgo.com/