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

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Message-ID: <CA+C-WL9eP2p0SVF8CZi+KABvBOgHiuFKe9Znx2ioJfYLxxH0OA@mail.gmail.com>
Date:	Thu, 24 Oct 2013 16:36:47 -0400
From:	Patrick Palka <patrick@...cs.ath.cx>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
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

On Thu, Oct 24, 2013 at 4:13 PM, Arnaldo Carvalho de Melo
<acme@...stprotocols.net> wrote:
> 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

I can't reproduce the detection failure in your branch, and a quick inspection
shows that the new feature-detection code is not subject to the kind of bug
that my patch fixed. So consider my patch obsolete.

Thanks,
Patrick
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