Messages in this thread | | | Date | Mon, 12 Oct 2009 15:31:58 -0400 | From | Masami Hiramatsu <> | Subject | Re: [PATCH tracing/kprobes v3 6/7] perf: Add perf probe subcommand for kprobe-event setup helper |
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Ingo Molnar wrote: > > * 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 ‘die_get_entrypc’: >> util/probe-finder.c:222: erreur: ‘Dwarf_Ranges’ 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: ‘ranges’ 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 ‘dwarf_get_ranges’ >> util/probe-finder.c:247: erreur: nested extern declaration of ‘dwarf_get_ranges’ >> util/probe-finder.c:251: erreur: implicit declaration of function ‘dwarf_ranges_dealloc’ >> util/probe-finder.c:251: erreur: nested extern declaration of ‘dwarf_ranges_dealloc’ >> 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?
Yeah, you may use an old version.
>> >> Which one should I pick? Mine is: >> >> libdwarf.h >> >> $Revision: #9 $ $Date: 2008/01/17 $
AFAICS, the revision tag is not updated :( I'm usually using libdwarf later than 20090324, and dwarf_get_ranges() was introduced from 20081231.
> > 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.
Sure, it's not so hard to check APIs.
Thank you,
-- Masami Hiramatsu
Software Engineer Hitachi Computer Products (America), Inc. Software Solutions Division
e-mail: mhiramat@redhat.com
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