linux-kernel - Unfortunate infinite make recursion

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Message-ID: <Pine.LNX.4.64.0709221319440.15712@fbirervta.pbzchgretzou.qr>
Date:	Sat, 22 Sep 2007 13:24:32 +0200 (CEST)
From:	Jan Engelhardt <jengelh@...putergmbh.de>
To:	sam@...nborg.org, zippel@...ux-m68k.org
cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Unfortunate infinite make recursion

Hi,

You can cause a recursion in kbuild/make with the following:

make O=$PWD kernel/time.o
make mrproper

Of course no one would use O=$PWD (that's just the testcase),
but this happened too often:

/ws/linux/linux-2.6.23$ make O=/ws/linux/linux-2.6.23 kernel/time.o
(Oops - should have been O=/ws/linux/obj-2.6.23!)

The make O=$PWD truncates the Makefile, making it necessary to run `git 
checkout Makefile` - should you have git; or reextract the tarball 
(should you /still/ have it). Well, can we catch this case somehow?

thanks,
Jan
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