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From:   Junio C Hamano <gitster@pobox.com>
To:     =?utf-8?B?w4Z2YXIgQXJuZmrDtnLDsA==?= Bjarmason <avarab@gmail.com>
Cc:     Johannes Schindelin <Johannes.Schindelin@gmx.de>,
        Jeff Hostetler via GitGitGadget <gitgitgadget@gmail.com>,
        git@vger.kernel.org, Jeff Hostetler <git@jeffhostetler.com>,
        Derrick Stolee <stolee@gmail.com>,
        Jeff Hostetler <jeffhost@microsoft.com>
Subject: Re: [PATCH v3 11/34] fsmonitor-fs-listen-win32: stub in backend for
 Windows
References: <pull.923.v2.git.1621691828.gitgitgadget@gmail.com>
        <pull.923.v3.git.1625150864.gitgitgadget@gmail.com>
        <5a9bda7220356ebf0689bb6aaa9068520dc6e33b.1625150864.git.gitgitgadget@gmail.com>
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        <nycvar.QRO.7.76.6.2107161747010.59@tvgsbejvaqbjf.bet>
        <87y2a6w61l.fsf@evledraar.gmail.com> <xmqqa6mlplo7.fsf@gitster.g>
Date:   Fri, 16 Jul 2021 22:21:42 -0700
In-Reply-To: <xmqqa6mlplo7.fsf@gitster.g> (Junio C. Hamano's message of "Fri,
        16 Jul 2021 22:13:44 -0700")
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Junio C Hamano <gitster@pobox.com> writes:

> #!/bin/sh
> cat >make.file <<\EOF
> all::
> ifeq ($(FSMONITOR_DAEMON_BACKEND),)
> 	echo it is empty
> endif
> ifdef FSMONITOR_DAEMON_BACKEND

An obvious typo.  This must be "ifndef", of course.

> 	echo it is undefined
> endif
> EOF
>
> echo "unset???"
> make -f make.file
>
> echo "set to empty???"
> make -f make.file FSMONITOR_DAEMON_BACKEND=
>
> These two make invocations will give us the same result, showing
> that "is it set to empty" and "is it unset" are the same.