linux-kernel - Re: [PATCH -tip] perf probe: Don't compile CFI related code if elfutils is old

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Date:	Tue, 11 May 2010 10:12:56 +0200
From:	Mark Wielaard <mjw@...hat.com>
To:	Masami Hiramatsu <mhiramat@...hat.com>
Cc:	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Robert Richter <robert.richter@....com>,
	Ingo Molnar <mingo@...e.hu>,
	lkml <linux-kernel@...r.kernel.org>,
	systemtap <systemtap@...rces.redhat.com>,
	Roland McGrath <roland@...hat.com>,
	DLE <dle-develop@...ts.sourceforge.net>
Subject: Re: [PATCH -tip] perf probe: Don't compile CFI related code if
 elfutils is old

On Mon, 2010-05-10 at 15:19 -0400, Masami Hiramatsu wrote:
> Hm, I'd like to add just '#ifndef _ELFUTILS_PREREQ;#error;#endif' to
> NO_DWARF checking in Makefile, because it's easier to expand to another
> API dependency.

You might want to check systemtap/dwarf-wrappers.h which handles missing
_ELFUTILS_PREREQ, so you can use it as if it is always defined. That
said, 0.138 is pretty old (latest is 0.147), so just requiring something
fresh might not be a bad thing.

Cheers,

Mark

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