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From: "Ævar Arnfjörð Bjarmason" <avarab@gmail.com>
To: Junio C Hamano <gitster@pobox.com>
Cc: Ramsay Jones <ramsay@ramsayjones.plus.com>,
	Jeff King <peff@peff.net>,
	git@vger.kernel.org, Denton Liu <liu.denton@gmail.com>
Subject: Re: [PATCH 0/3] Makefile: make "sparse" and "hdr-check" non-.PHONY
Date: Thu, 23 Sep 2021 04:17:16 +0200	[thread overview]
Message-ID: <878rzo58z4.fsf@evledraar.gmail.com> (raw)
In-Reply-To: <xmqqtuic2igl.fsf@gitster.g>


On Wed, Sep 22 2021, Junio C Hamano wrote:

> Ævar Arnfjörð Bjarmason <avarab@gmail.com> writes:
>
>> I've got some WIP efforts in other areas to do that for some other
>> rules.
>>
>> The problem is that you need to "mkdir .shrapnel" to create a
>> ".shrapnel/revision.sp". So you need the ".shrapnel/revision.sp" to
>> depend on the ".shrapnel".
>>
>> Except you'll find that the naïve implementation of that fails, since
>> any file you create will bump the mtime of the containing directory, so
>> you'll keep re-making ".shrapnel/revision.sp" because ".shrapnel"
>> changed, because ".shrapnel/revision.sp" changed...
>
> We depend on GNU make anyway.  Isn't its "order-only-prerequisites"
> feature what you exactly want to use for the above?

It looks like it, and that I should probably take more time one of these
days to read the GNU make manual through.

But in any case, I do think that's worthwhile in general, i.e. you can
depend on %.h and not need to exclude generated %.h that we make
ourselves if we put that into "gen/" or whatever, "clean" also becomes a
lot easier.

But I'd like to leave it for some future effort of moving *.o, *.sp
etc. generated files around, rather than making *.sp an odd special-case
now.

  reply	other threads:[~2021-09-23  2:20 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-21 22:55 [PATCH 0/3] Makefile: make "sparse" and "hdr-check" non-.PHONY Ævar Arnfjörð Bjarmason
2021-09-21 22:55 ` [PATCH 1/3] Makefile: make the "sparse" target non-.PHONY Ævar Arnfjörð Bjarmason
2021-09-22  2:24   ` Jeff King
2021-09-21 22:55 ` [PATCH 2/3] Makefile: do one append in %.hcc rule Ævar Arnfjörð Bjarmason
2021-09-21 22:55 ` [PATCH 3/3] Makefile: make the "hdr-check" target non-.PHONY Ævar Arnfjörð Bjarmason
2021-09-22  2:11 ` [PATCH 0/3] Makefile: make "sparse" and "hdr-check" non-.PHONY Jeff King
2021-09-22 16:58   ` Ramsay Jones
2021-09-22 17:53     ` Jeff King
2021-09-22 19:17       ` Ramsay Jones
2021-09-22 23:28         ` Junio C Hamano
2021-09-23  1:07           ` Ævar Arnfjörð Bjarmason
2021-09-23  1:23             ` Junio C Hamano
2021-09-23  2:17               ` Ævar Arnfjörð Bjarmason [this message]
2021-09-22 19:24     ` Junio C Hamano
2021-09-23  0:07 ` [PATCH v2] Makefile: make the "sparse" target non-.PHONY Ævar Arnfjörð Bjarmason
2021-09-23 16:24   ` Jeff King
2021-09-23 17:06     ` Ævar Arnfjörð Bjarmason
2021-09-23 17:17       ` Jeff King
2021-09-23 17:39     ` Junio C Hamano
2021-09-23 23:28       ` Ramsay Jones
2021-09-24  1:16         ` Ævar Arnfjörð Bjarmason
2021-09-24 16:38           ` Ramsay Jones
2021-09-24  1:30       ` Ævar Arnfjörð Bjarmason
2021-09-24 19:37         ` Junio C Hamano
2021-09-28  1:15   ` [PATCH v3] Makefile: add a non-.PHONY "sparse-incr" target Ævar Arnfjörð Bjarmason
2021-09-28  1:43     ` [PATCH v4] " Ævar Arnfjörð Bjarmason
2021-09-28 17:44       ` Junio C Hamano
2021-09-28 19:45         ` Ævar Arnfjörð Bjarmason

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