linux-kernel - Re: [PATCH] perf tools: Fix build error on read only source.

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Date:	Wed, 18 Aug 2010 14:01:58 -0300
From:	Arnaldo Carvalho de Melo <acme@...radead.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Kusanagi Kouichi <slash@...auone-net.jp>,
	Bernd Petrovitsch <bernd@...prog.at>,
	Paul Mackerras <paulus@...ba.org>, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf tools: Fix build error on read only source.

Em Wed, Aug 18, 2010 at 01:56:42PM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Wed, Aug 18, 2010 at 04:27:45PM +0200, Peter Zijlstra escreveu:
> > 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.
> 
> Not something I'll argue too much :)
> 
> I'll apply the patch as it fixes a bug and later make the perf Makefile
> complain about the output dir not existing, i.e. providing a message
> similar to what the kernel proper does instead of the cryptic message we
> get today.

[acme@...lia linux-2.6-tip]$ rm -rf ~/git/build/perf/
[acme@...lia linux-2.6-tip]$ make O=~/git/build/perf -C tools/perf 
make: Entering directory `/home/acme/git/linux-2.6-tip/tools/perf'
Makefile:503: No libdw.h found or old libdw.h found or elfutils is older than 0.138, disables dwarf support. Please install new elfutils-devel/libdw-dev
Makefile:534: *** No gnu/libc-version.h found, please install glibc-dev[el]/glibc-static.  Stop.
make: Leaving directory `/home/acme/git/linux-2.6-tip/tools/perf'
[acme@...lia linux-2.6-tip]$

- Arnaldo
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