Re: [PATCH tracing/kprobes v3 6/7] perf: Add perf probe subcommandfor kprobe-event setup helper

[Ingo Molnar]

* Frederic Weisbecker <fweisbec@xxxxxxxxx> 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
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