linux-kernel - Re: [PATCH] perf: allow user to indicate path to objdump in command line

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Message-ID: <1346822564.18428.3.camel@localhost.localdomain>
Date:	Wed, 05 Sep 2012 07:22:44 +0200
From:	Maciek Borzecki <maciek.borzecki@...il.com>
To:	Michael Ellerman <michael@...erman.id.au>,
	David Ahern <dsahern@...il.com>
Cc:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-perf-users@...r.kernel.org
Subject: Re: [PATCH] perf: allow user to indicate path to objdump in command
 line

On Wed, 2012-09-05 at 12:11 +1000, Michael Ellerman wrote:
> On Tue, 2012-09-04 at 10:05 -0600, David Ahern wrote:
> > On 9/4/12 4:32 AM, Maciek Borzecki wrote:
> > > When analyzing perf data from hosts of other architecture than one of the local
> > > host it's useful to call objdump that is part of a toolchain for that
> > > architecture. Instead of calling regular objdump, call one that user specified
> > > in command line.
> > 
> > Why not set the PATH to make the toolchain's version the one used by perf?
> 
> At least one reason is that cross toolchains are usually built such that
> the resulting binaries are called <target>-objdump, <target>-gcc etc.
Correct, PATH won't work. First I thought, why not hardcode objdump
based on CROSS. But then, I'd need to rebuild perf for each toolchain,
bad idea.
Passing objdump in command line seems like a good compromise to me,
especially as I haven't noticed any other binutils tools to be used by
perf same way as objdump is.

-- 
Maciek Borzecki <maciek.borzecki@...il.com>

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