linux-kernel - Re: [tip:perf/core] perf probe: Add --list option for listing current probe events

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Message-ID: <20091202060655.GB5719@nowhere>
Date:	Wed, 2 Dec 2009 07:06:57 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Wang Liming <liming.wang@...driver.com>
Cc:	Masami Hiramatsu <mhiramat@...hat.com>, mingo@...hat.com,
	peterz@...radead.org, linux-kernel@...r.kernel.org,
	acme@...hat.com, rostedt@...dmis.org, jbaron@...hat.com,
	tglx@...utronix.de, fche@...hat.com, jkenisto@...ibm.com,
	hch@...radead.org, ananth@...ibm.com, srikar@...ux.vnet.ibm.com,
	prasad@...ux.vnet.ibm.com
Subject: Re: [tip:perf/core] perf probe: Add --list option for listing
	current probe events

On Wed, Dec 02, 2009 at 01:35:39PM +0800, Wang Liming wrote:
> Yes, my glibc is old so that "perf" can't be built. I'm using ubuntu 8.04.
>
> Thanks a lot.



What is your glibc version?
%m appears to be supported since 2.7

But if possible we would like perf to be buildable on most
boxes. May be should we use %a instead there.

odd gcc versions will whine because of the confusion with the %a for
floating point things but that can be worked around with (float *) casts (sigh).
Well, since we also have strict aliasing checks, we'll actually need:

scanf("%a", (float *)(void *)str);

We do that in util/trace-event-parse.c

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