linux-kernel - Re: [PATCH 1/2] tools lib traceevent: Export dynamic symbols used by traceevent plugins

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Date:	Tue, 12 May 2015 08:40:44 +0200
From:	Mathias Krause <minipli@...glemail.com>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	He Kuang <hekuang@...wei.com>, jolsa@...nel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Ingo Molnar <mingo@...hat.com>, wangnan0@...wei.com,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] tools lib traceevent: Export dynamic symbols used by
 traceevent plugins

On 11 May 2015 at 16:33, Jiri Olsa <jolsa@...hat.com> wrote:
> On Mon, May 11, 2015 at 09:35:26AM +0000, He Kuang wrote:
>> Traceevent plugins need dynamic symbols exported from libtraceevent.a,
>> otherwise a dlopen error will occur during plugins loading.
>>
>> This patch uses dynamic-list-file to export dynamic symbols which will
>> be used in plugins to perf executable.
>>
>> The problem is covered up if feature-libpython is enabled, because
>> PYTHON_EMBED_LDOPTS contains '-Xlinker --export-dynamic' which adds all
>> symbols to the dynamic symbol table. So we should reproduce the problem
>> by setting NO_LIBPYTHON=1.
>
> there's was another patch taking the shortcut:
>   http://marc.info/?l=linux-kernel&m=142885447432384&w=2
>
> it seems it's not merged yet, but I like this one better
>

I don't care much as long as it get fixed -- either using the big
hammer with -Wl,--export-dynamic or the fine grained approach using a
symbol file.

Thanks,
Mathias
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