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From:   Junio C Hamano <gitster@pobox.com>
To:     Ramsay Jones <ramsay@ramsayjones.plus.com>
Cc:     GIT Mailing-list <git@vger.kernel.org>,
        Pratyush Yadav <me@yadavpratyush.com>,
        Adam Dinwoodie <adam@dinwoodie.org>
Subject: Re: [RFC PATCH 0/8] speed up 'make clean'
References: <e1d218bb-7658-565e-0931-2411efbb561c@ramsayjones.plus.com>
Date:   Thu, 05 Nov 2020 13:48:29 -0800
In-Reply-To: <e1d218bb-7658-565e-0931-2411efbb561c@ramsayjones.plus.com>
        (Ramsay Jones's message of "Thu, 5 Nov 2020 21:01:08 +0000")
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Ramsay Jones <ramsay@ramsayjones.plus.com> writes:

> [Yes, 'cd Documentation; make clean all' will be slower that a doing
> separate 'make clean; make', but the extra 10s, or so, will be swamped
> by the documentation build time! ;-) ]

Hmph, the "all" part in "make clean all" needs the information we
read from these generated files, and time must be spent to generate
them whether "make clean all" or "make clean; make all" is used.  In
the latter, we may not generate and read them in the first phase,
but the second one "make all" would need to do so anyway.  So I am
puzzled why "make clean all" needs to be slower---don't we generate
and read them only once in either case?