linux-kernel - Re: [PATCH] perf: fix wrong DEBUG configuration

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Message-ID: <20150520135333.GE2955@kernel.org>
Date:	Wed, 20 May 2015 10:53:34 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Martin Liška <mliska@...e.cz>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH] perf: fix wrong DEBUG configuration

Em Wed, May 20, 2015 at 03:29:37PM +0200, Martin Liška escreveu:
> On 05/20/2015 03:17 PM, Arnaldo Carvalho de Melo wrote:
> >Em Wed, May 20, 2015 at 03:07:39PM +0200, Martin Liška escreveu:
> >>Currently, GCC optimizes -O6 same as -O3 level. Right optimize debugging
> >>experience is given by passing -Og to compiler.

> >Is this is this -Og available in old gcc versions? When was it
> >introduced? Do you know?
 
> GCC 4.8.0 is the first version capable of the option: https://gcc.gnu.org/gcc-4.8/changes.html.
> That can be problematic, which GCC version do you support in linux/perf?

So the rule has been: What are the kernel requirements for the
toolchain? tools/perf/ should build with that.

Looking at the kernel's README, that is...

-------------

COMPILING the kernel:

 - Make sure you have at least gcc 3.2 available.
   For more information, refer to Documentation/Changes.

--------------

The oldest toolchain I personally test from time to time is:

[acme@...l5 ~]$ rpm -q gcc make binutils
gcc-4.1.2-55.el5
make-3.81-3.el5
binutils-2.17.50.0.6-26.el5
[acme@...l5 ~]$

- Arnaldo
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