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From: Junio C Hamano <gitster@pobox.com>
To: "Ævar Arnfjörð Bjarmason" <avarab@gmail.com>
Cc: Jeff King <peff@peff.net>, git@vger.kernel.org
Subject: Re: [PATCH 1/4] Makefile: don't re-define PERL_DEFINES
Date: Thu, 06 May 2021 17:42:41 +0900	[thread overview]
Message-ID: <xmqq7dkcz20u.fsf@gitster.g> (raw)
In-Reply-To: <87y2csv0qm.fsf@evledraar.gmail.com> (=?utf-8?B?IsOGdmFyIEFy?= =?utf-8?B?bmZqw7Zyw7A=?= Bjarmason"'s message of "Thu, 06 May 2021 08:23:28 +0200")

Ævar Arnfjörð Bjarmason <avarab@gmail.com> writes:

>>> -PERL_DEFINES = $(PERL_PATH_SQ):$(PERLLIB_EXTRA_SQ):$(perllibdir_SQ)
>>> -
>>> -PERL_DEFINES := $(PERL_PATH_SQ) $(PERLLIB_EXTRA_SQ) $(perllibdir_SQ)
>>> +PERL_DEFINES :=
>>> +PERL_DEFINES += $(PERL_PATH_SQ)
>>> +PERL_DEFINES += $(PERLLIB_EXTRA_SQ)
>>> +PERL_DEFINES += $(perllibdir_SQ)
>>>  PERL_DEFINES += $(RUNTIME_PREFIX)
>>
>> I don't think we generally use simply-expanded variables in our Makefile
>> unless there's a reason. Do we actually need it here? Obviously not new
>> in your patch, but just a curiosity I noticed while reading it.
>
> I didn't notice it at the time. I suppose it could be changed to not do
> expansion, but per-se unrelated to the more narrorw bugfix in this
> patch.

Actually, strictly speaking there was *no* bug because assigning
three items with := made sure the previous recursively expanded one
to be ineffective.  In other words, there was a valid reason to use
":=" there in the original version.

Now your patch removed the recursively expanded one that was
immediately invalidated, there no longer is a reason to use :=
there.  So "unrelated to the more narrow bugfix" is a rather lame
excuse to do only half a task.  If we remove that extra one (which
is a good thing), then we should correct := into = because the
original used := only because there was the unwanted extra one, no?

  reply	other threads:[~2021-05-06  8:42 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-05 12:21 [PATCH 0/4] Makefile/perl: correctly re-generate build/* + speed up under NO_GETTEXT=Y Ævar Arnfjörð Bjarmason
2021-05-05 12:21 ` [PATCH 1/4] Makefile: don't re-define PERL_DEFINES Ævar Arnfjörð Bjarmason
2021-05-05 14:08   ` Jeff King
2021-05-06  1:05     ` Junio C Hamano
2021-05-06 16:55       ` Jeff King
2021-05-06  6:23     ` Ævar Arnfjörð Bjarmason
2021-05-06  8:42       ` Junio C Hamano [this message]
2021-05-06  9:04         ` Ævar Arnfjörð Bjarmason
2021-05-06 16:59           ` Jeff King
2021-05-07  8:42           ` Junio C Hamano
2021-05-05 12:21 ` [PATCH 2/4] Makefile: regenerate perl/build/* if GIT-PERL-DEFINES changes Ævar Arnfjörð Bjarmason
2021-05-05 12:21 ` [PATCH 3/4] Makefile: regenerate *.pm on NO_PERL_CPAN_FALLBACKS change Ævar Arnfjörð Bjarmason
2021-05-05 12:21 ` [PATCH 4/4] perl: use mock i18n functions under NO_GETTEXT=Y Ævar Arnfjörð Bjarmason
2021-05-10 10:50 ` [PATCH v2 0/6] Makefile/perl: correctly re-generate build/* + speed up " Ævar Arnfjörð Bjarmason
2021-05-10 10:50   ` [PATCH v2 1/6] Makefile: regenerate perl/build/* if GIT-PERL-DEFINES changes Ævar Arnfjörð Bjarmason
2021-05-10 10:50   ` [PATCH v2 2/6] Makefile: don't re-define PERL_DEFINES Ævar Arnfjörð Bjarmason
2021-05-10 10:50   ` [PATCH v2 3/6] Makefile: make PERL_DEFINES recursively expanded Ævar Arnfjörð Bjarmason
2021-05-10 10:50   ` [PATCH v2 4/6] Makefile: split up the deceleration of PERL_DEFINES Ævar Arnfjörð Bjarmason
2021-05-10 10:50   ` [PATCH v2 5/6] Makefile: regenerate *.pm on NO_PERL_CPAN_FALLBACKS change Ævar Arnfjörð Bjarmason
2021-05-10 10:50   ` [PATCH v2 6/6] perl: use mock i18n functions under NO_GETTEXT=Y Ævar Arnfjörð Bjarmason
2021-05-10 18:17   ` [PATCH v2 0/6] Makefile/perl: correctly re-generate build/* + speed up " Junio C Hamano
2021-05-11  6:56     ` Ævar Arnfjörð Bjarmason
2021-05-11  7:05       ` Junio C Hamano
2021-05-12  9:49         ` [PATCH] Makefile: make PERL_DEFINES recursively expanded Ævar Arnfjörð Bjarmason
2021-05-12 19:53           ` Jeff King
2021-05-12 22:45             ` Junio C Hamano

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