linux-kernel - Re: [PATCH] perf tools: add compatibility with libelf 0.8 and autodetect

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Date:	Sat, 24 Oct 2009 11:26:31 -0200
From:	Lucas De Marchi <lucas.de.marchi@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Marti Raudsepp <marti@...fo.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Mike Galbraith <efault@....de>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf tools: add compatibility with libelf 0.8 and 
	autodetect

On Sat, Oct 24, 2009 at 06:30, Ingo Molnar <mingo@...e.hu> wrote:
> I.e. something like this:
>
> /*
>  * libelf 0.8 and earlier do not support ELF_C_READ_MMAP;
>  * for newer versions we can use mmap to reduce memory usage:
>  */
> #ifndef ELF_C_READ_MMAP
> # define PERF_ELF_C_READ_MMAP ELF_C_READ
> #endif

In this case you should define PERF_ELF_C_READ_MMAP as ELF_C_READ_MMAP
when using elftutils:
#ifndef ELF_C_READ_MMAP
# define PERF_ELF_C_READ_MMAP ELF_C_READ
#else
# define PERF_ELF_C_READ_MMAP ELF_C_READ_MMAP
#endif

and change all places to use PERF_ELF_C_READ_MMAP


I think the comment is wrong. I downloaded the latest version of
libelf, i.e. 0.8.12 at http://www.mr511.de/software/english.html, and
there's no support to ELF_C_READ_MMAP. It's a elfutils' feature only.
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