linux-kernel - Re: [RFC 6/6] perf build: Introduce FEATURES

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Date:	Wed, 13 Jan 2016 18:11:23 +0800
From:	"Wangnan (F)" <wangnan0@...wei.com>
To:	Jiri Olsa <jolsa@...hat.com>
CC:	Jiri Olsa <jolsa@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	lkml <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	"Ingo Molnar" <mingo@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [RFC 6/6] perf build: Introduce FEATURES_DUMP make variable



On 2016/1/13 18:03, Jiri Olsa wrote:
> On Wed, Jan 13, 2016 at 05:46:13PM +0800, Wangnan (F) wrote:
>
> SNIP
>
>>> I'll try to check on that.. does this patch help to improve
>>> the current speed or do you need to solve this to get substantial
>>> speedup?
>> I'm working on it. I have already done it, but still have some
>> problem. On some machine 'make_static' test target lost
>> '-liberty -lz' in its linker options. Seems something wrong in
>> this part:
>>
>> ifeq ($(feature-libbfd), 1)
>>    EXTLIBS += -lbfd
>>
>>    # call all detections now so we get correct
>>    # status in VF output
>>    $(call feature_check,liberty)
>>    $(call feature_check,liberty-z)
>>    $(call feature_check,cplus-demangle)
>>
>>    ifeq ($(feature-liberty), 1)
>>      EXTLIBS += -liberty
>>    else
>>      ifeq ($(feature-liberty-z), 1)
>>        EXTLIBS += -liberty -lz
>>      endif
>>    endif
>> endif
> IIRC we had issues with this before.. different systems
> provide those libs in different way, like:
>    2cf9040714f3 perf tools: Fix bfd dependency libraries detection
>
> you might want to check feature detection code if it gets
> built properly on your system

No this problem. There's no feature-libiberty and feature-libiberty-z in
output feature-dump file. This is the key reason.

> jirka