linux-kernel - Re: [PATCH 34/34] perf tools unwinding: Use the per-feature check flags

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Date:	Tue, 3 Dec 2013 17:15:46 +0100
From:	Jean Pihet <jean.pihet@...aro.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Will Deacon <will.deacon@....com>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	Patch Tracking <patches@...aro.org>
Subject: Re: [PATCH 34/34] perf tools unwinding: Use the per-feature check flags

I just resent the patches as v2.

I tested on x86_64, ARMv7 and ARMv8 with and without LIBUNWIND_DIR=
set in 'make -C tools/perf'. Can you check on your build setup?

Thanks,
Jean

On 29 November 2013 16:45, Jiri Olsa <jolsa@...hat.com> wrote:
> On Thu, Nov 28, 2013 at 09:02:23PM +0100, Jean Pihet wrote:
>> On 28 November 2013 14:46, Arnaldo Carvalho de Melo <acme@...radead.org> wrote:
>> > Em Thu, Nov 28, 2013 at 09:56:19AM -0300, Arnaldo Carvalho de Melo escreveu:
>> >> Em Thu, Nov 28, 2013 at 10:58:01AM +0100, Jiri Olsa escreveu:
>> >> > On Wed, Nov 27, 2013 at 11:43:23PM +0100, Jiri Olsa wrote:
>> >> > > On Wed, Nov 27, 2013 at 05:16:34PM -0300, Arnaldo Carvalho de Melo wrote:
>> >> > >   LINK     perf
>> >> > > /bin/ld: cannot find -lunwind
>> >> > > /bin/ld: cannot find -lunwind-x86_64
>> >> > > collect2: error: ld returned 1 exit status
>> >> > > make[1]: *** [perf] Error 1
>> >> > > make[1]: *** Waiting for unfinished jobs....
>> >> > > make: *** [all] Error 2
>> >>
>> >> > > I haven't checked this one.. will do tomorrow
>> >>
>> >> > we need to plug libunwind flags/libs only if
>> >> > the $(feature-libunwind) is enabled..
>> >>
>> >> > NO_LIBUNWIND - user's decision not to link with libunwind or
>> >> >                architecture that does not support it
>> >>
>> >> > $(feature-libunwind) - if it's actually installed
>> >>
>> >> > attached change fixies that for me, feel free to use/merge it
>> >>
>> >> Argh, I used tests/make on one machine where those two patches by Jean
>> >> were not applied, then rebased on another, the one I use to submit,
>> >> those got included but not tests/make tested, which probably explains
>> >> why this got thru :-\
>> >>
>> >> Jean, can you please check that this works for you on ARM too?
>> >
>> > I just noticed that this patch breaks the feature detection mechanism,
>> > after it is applied it is back performing all tests at every make call,
>> > this needs rethinking, so I'm dropping both.
>> Oh I am sorry about that. I tested on ARM with and without the
>> LIBUNWIND_DIR option set.
>> Let me rethink/rework this and come back to you with a proper fix.
>>
>> >
>> > Ingo, please disregard, yet again, my latest pull request, sigh.
>> >
>> > Jiri, this could be something for tests/make, till then I'll try
>> > to check this manually.
>>
>> One question though: are you OK with the principle of having
>> per-feature check flags? This brings two things to the feature
>> detection and build:
>> 1. the ability to specify specific flags for the feature check, which
>> is not possible on the current code,
>> 2. a simplification in the Makefiles.
>
> looks good to me
>
> jirka
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