Re: makefiles writing to $@ should first write to $@.new

From: Julien Rouhaud <rjuju123(at)gmail(dot)com>
To: Michael Paquier <michael(at)paquier(dot)xyz>
Cc: Justin Pryzby <pryzby(at)telsasoft(dot)com>, pgsql-hackers(at)lists(dot)postgresql(dot)org
Subject: Re: makefiles writing to $@ should first write to $@.new
Date: 2022-01-24 04:07:50
Message-ID: 20220124040750.iizc42vlhjpyblnn@jrouhaud
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Hi,

On Mon, Jan 24, 2022 at 12:41:49PM +0900, Michael Paquier wrote:
> On Sun, Jan 23, 2022 at 09:23:05PM -0600, Justin Pryzby wrote:
> > If the rule is interrupted (due to ^C or ENOSPC), foo can be 0 bytes or
> > partially written, but won't be rebuilt until someone runs distclean or debugs
> > it and removes the individual file, as I did for errcodes.h.
>
> Honestly, I am not sure that this worth bothering about. This comes
> down to a balance between the code complexity and the likelihood of a
> failure, and the odds are not in favor of the later IMO. Now, it
> could be perhaps possible to make such a change simple enough while it
> avoids a lot of technical debt, but we have a lot of custom rules
> particularly in src/bin/, so changing all that or even require that in
> future changes is not really appealing.

I agree, it doesn't seem worth it.

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