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Re: [PATCH tracing/kprobes v3 6/7] perf: Add perf probe subcommand for kprobe-event setup helper
- From: Ingo Molnar <mingo at elte dot hu>
- To: Frederic Weisbecker <fweisbec at gmail dot com>
- Cc: Masami Hiramatsu <mhiramat at redhat dot com>, Steven Rostedt <rostedt at goodmis dot org>, lkml <linux-kernel at vger dot kernel dot org>, systemtap <systemtap at sources dot redhat dot com>, DLE <dle-develop at lists dot sourceforge dot net>, Thomas Gleixner <tglx at linutronix dot de>, Arnaldo Carvalho de Melo <acme at redhat dot com>, Mike Galbraith <efault at gmx dot de>, Paul Mackerras <paulus at samba dot org>, Peter Zijlstra <a dot p dot zijlstra at chello dot nl>, Christoph Hellwig <hch at infradead dot org>, Ananth N Mavinakayanahalli <ananth at in dot ibm dot com>, Jim Keniston <jkenisto at us dot ibm dot com>, "Frank Ch. Eigler" <fche at redhat dot com>
- Date: Mon, 12 Oct 2009 21:07:07 +0200
- Subject: Re: [PATCH tracing/kprobes v3 6/7] perf: Add perf probe subcommand for kprobe-event setup helper
- References: <20091007222733.1684.32035.stgit@dhcp-100-2-132.bos.redhat.com> <20091007222822.1684.3251.stgit@dhcp-100-2-132.bos.redhat.com> <20091012190303.GA4748@nowhere>
* Frederic Weisbecker <fweisbec@gmail.com> wrote:
> On Wed, Oct 07, 2009 at 06:28:23PM -0400, Masami Hiramatsu wrote:
> > Add perf probe subcommand for kprobe-event setup helper to perf command.
> > This allows user to define kprobe events by C expressions (C line numbers,
> > C function names, and C local variables).
> >
>
>
> My libdwarf.h and dwarf.h are available through <libdwarf.h> and
> <dwarf.h>, these are in /usr/include
>
> But even by fixing the include path in the makefile and probe-finder.h,
> I get the following build error:
>
> util/probe-finder.c: In function âdie_get_entrypcâ:
> util/probe-finder.c:222: erreur: âDwarf_Rangesâ undeclared (first use in this function)
> util/probe-finder.c:222: erreur: (Each undeclared identifier is reported only once
> util/probe-finder.c:222: erreur: for each function it appears in.)
> util/probe-finder.c:222: erreur: ârangesâ undeclared (first use in this function)
> cc1: warnings being treated as errors
> util/probe-finder.c:223: erreur: ISO C90 forbids mixed declarations and code
> util/probe-finder.c:247: erreur: implicit declaration of function âdwarf_get_rangesâ
> util/probe-finder.c:247: erreur: nested extern declaration of âdwarf_get_rangesâ
> util/probe-finder.c:251: erreur: implicit declaration of function âdwarf_ranges_deallocâ
> util/probe-finder.c:251: erreur: nested extern declaration of âdwarf_ranges_deallocâ
> make: *** [util/probe-finder.o] Erreur 1
>
>
> I remember we talked about that before, but I don't remember well why it happened.
> This is because of a libdwarf version or something, right?
>
> Which one should I pick? Mine is:
>
> libdwarf.h
>
> $Revision: #9 $ $Date: 2008/01/17 $
if it's possible to still have a single set of APIs it would be nice to
auto-detect and massage all these libdwarf versions into a single
backend within perf.
Ingo