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Subject: Re: [PATCH] perf tools: Fix build error on read only source.
From: Peter Zijlstra <peterz@infradead.org>
To: Arnaldo Carvalho de Melo <acme@infradead.org>
Cc: Kusanagi Kouichi <slash@ac.auone-net.jp>,
        Paul Mackerras <paulus@samba.org>, Ingo Molnar <mingo@elte.hu>,
        linux-kernel@vger.kernel.org
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Date: Wed, 18 Aug 2010 16:27:45 +0200
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On Wed, 2010-08-18 at 11:16 -0300, Arnaldo Carvalho de Melo wrote:
> rm -rf ~/build
> make O=~/build
> 
> and have everything work? Saving some keystrokes 8)

The turn side is that if you typo the output dir you'll probably not
ever find it again.. and you could have typed: rm -rf ~/build/* instead.