Re: [PATCH] Makefile: generate 'git' as 'cc [...] -o git+ && mv git+ git'

From: Junio C Hamano <gitster@pobox.com>
Date: Mar 7, 2021, 20:41 UTC
Message-ID: <xmqq35x68zob.fsf@gitster.c.googlers.com>
In-Reply-To: <20210307132001.7485-1-avarab@gmail.com>

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

> Change the compilation of the main 'git' binary to not have the CC
> clobber 'git' in-place. This means that e.g. running the test suite
> in-place and recompiling won't fail whatever tests happen to be
> running for the duration of the binary being regenerated.

I am not sure why I would want to support the workflow this is trying to help.

I do not want to see a patch on this list claiming that "While the whole test suite is running, I tweaked the source three times and recompiled, so some tests may have used my second iteration while others may have used my third and the final version of the code---in any case, all tests passed". And when a patch that was developed that way came in, I do not want to hear "Yes, the test suite used mixed binaries, but I KNOW the difference between my second and third iteration should not matter the parts of the earlier tests that used the older iteration".