linux-kernel - Re: [PATCHv2 00/36] perf tools: New build framework

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Date:	Thu, 15 Jan 2015 09:08:00 -0700
From:	David Ahern <dsahern@...il.com>
To:	Jiri Olsa <jolsa@...nel.org>, linux-kernel@...r.kernel.org
CC:	Adrian Hunter <adrian.hunter@...el.com>,
	Alexis Berlemont <alexis.berlemont@...il.com>,
	Andi Kleen <ak@...ux.intel.com>,
	Anton Blanchard <anton@...ba.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Borislav Petkov <bp@...en8.de>, Borislav Petkov <bp@...e.de>,
	Cody P Schafer <cody@...ux.vnet.ibm.com>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	Florian Fainelli <florian@...nwrt.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Jean Pihet <jean.pihet@...aro.org>,
	Mark Salter <msalter@...hat.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <peterz@...radead.org>,
	"S. Lockwood-Childs" <sjl@...labs.com>,
	Sam Ravnborg <sam@...nborg.org>,
	Sasha Levin <sasha.levin@...cle.com>,
	Stephane Eranian <eranian@...gle.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>,
	Will Deacon <will.deacon@....com>
Subject: Re: [PATCHv2 00/36] perf tools: New build framework

On 1/15/15 5:54 AM, Jiri Olsa wrote:
> Since it's actually small portion of kbuild that perf needs,
> I realized it's actually better to steal it than 'reconfigure'
> kbuild to be usable for perf.
>
> Also this patchset is kind of incremental version of the latest:
>    perf tools: Add kbuild support into Makefile.kbuild
> so it should be easier to review.
>
> NOTE I couldn't find any copyright/credit messages in the kbuild
> system, but would be happy to include it if someone suggests one.
>
> The stolen parts are in files:
>    Makefile.kbuild
>    Build.include
>
> The idea and more details are explained in the 'Documentation/Build'
> file. The basic idea is the same as in kbuild system, with some minor
> changes to allow for multiple binaries build definitions.
>
> User provides 'Build' files with objects definitions like:
>    perf-y += perf.o
>    perf-y += builtin-bench.o
>    ...
>
>    libperf-y += util/
>    ...
>

It is not obvious to me how this works. Users provide a .config file for 
building perf? Or do users provide Build files like you state above? If 
it is a .config file then what if a .config file is not present is it 
auto generated using the current autoprobing?

David


> and the build framework outputs files:
>    perf-in.o
>    libperf-in.o
>
> which are then linked into appropriate binaries/libraries.
> (perf libperf.a libperf-gtk.so)
>


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