linux-kernel - Re: [PATCH 12/14] tools build: Allow to override feature checks setup

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Date:	Tue, 3 Mar 2015 18:55:31 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	David Ahern <david.ahern@...cle.com>
Cc:	Jiri Olsa <jolsa@...nel.org>, linux-kernel@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH 12/14] tools build: Allow to override feature checks setup

On Tue, Mar 03, 2015 at 10:49:08AM -0700, David Ahern wrote:
> On 3/3/15 7:26 AM, Jiri Olsa wrote:
> >Allowing to override configuration variables for feature
> >checks. Also adding automated test and documentation.
> 
> Rather than an 'override' why not require users to specify feature checks of
> interest? ie., the previous patch moved all of perf's feature checks to a
> common Makefile. Why not have perf specify features of interest to it
> instead?

well, thats what they can do as you can see in the example:

+  FEATURE_TESTS   := glibc backtrace
+  FEATURE_DISPLAY := glibc
+
+  srctree := ../../../..
+  include $(srctree)/tools/build/Makefile.feature

you specify features you want to check in FEATURE_TESTS variable
and features status you want to display in FEATURE_DISPLAY variable

at the mean time the default settings for those 2 is what
perf uses now (perf is the only user)

in future when there's multiple users, perf will set those
variables as well..

jirka
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