linux-kernel - Re: [PATCH] perf: Fix library detection when building without libelf

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Message-ID: <20131024201349.GG4998@ghostprotocols.net>
Date:	Thu, 24 Oct 2013 17:13:49 -0300
From:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
To:	Patrick Palka <patrick@...cs.ath.cx>
Cc:	linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>, Jiri Olsa <jolsa@...hat.com>
Subject: Re: [PATCH] perf: Fix library detection when building without libelf

Em Wed, Oct 23, 2013 at 10:51:09PM -0400, Patrick Palka escreveu:
> When I attempt to build perf on a system with slang but without libelf,
> 'make' would wrongly complain that the slang library could not be found.
> 
> It turns out that this was happening because we are not filtering -lelf
> from EXTLIBS early enough.  As a result, the library test for slang
> (ditto for gtk, libaudit, etc) erroneously passes -lelf to try-cc, which
> of course fails on a system without libelf.
> 
> This patch makes the filtering of -lelf from EXTLIBS occur right after
> testing for libelf support, so that the subsequent library tests will
> not erroneously pass -lelf to try-cc when building without libelf
> support.

Can you please check with the perf/core branch in my tree or Ingo's?

git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git perf/core

or Ingo's:

git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git perf/core

The feature detection was reworked and perhaps it is fixed there.

- Arnaldo
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