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Date: Sat, 12 Aug 2017 10:06:55 +0200
From: Sam Ravnborg <sam@ravnborg.org>
Subject: Re: make clean all broken with -j? + question regarding modpost
Message-ID: <20170812080655.GA19083@ravnborg.org>
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To: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: Jim Davis <jim.epost@gmail.com>, Randy Dunlap <rdunlap@infradead.org>, Thomas Meyer <thomas@m3y3r.de>, linux-kernel <linux-kernel@vger.kernel.org>, linux-kbuild <linux-kbuild@vger.kernel.org>

Hi Masahiro
> 
> Kbuild does not cater to the mixture of clean targets and build targets,
> but I do not know why.

The details has long escaped me but in general we do not want to
have a job deleting all .o files running in parallel with a job that
creates .o files.

So we wanted the following to work:

	$make mrproper defconfig

make would in the standard configuration execute "mrproper" and "defconfig"
in parallel which would result in a broken build.

This is the background for some of the ugly hacks in the
top-level makefile.

	Sam