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

[Arnaldo Carvalho de Melo]

Em Mon, May 10, 2010 at 02:57:34PM -0400, Masami Hiramatsu escreveu:
> Hmm, ok, version.h is also introduced at the same time.
> 
> # git log ./config/version.h.in
> commit fbc7245df72ce0142f0a21fa0f4f88c97278bf60
> Author: Roland McGrath <roland@redhat.com>
> Date:   Tue Dec 16 17:03:03 2008 -0800
> 
>     Install elfutils/version.h header for library compatibility checking.
> 
> So, I think we'd better set NO_DWARF if the elfutils
> is older than 0.138, since we can't check API compatibility
> easily.

Well, for that you can just add some of the code you ifdefed in this
patch into the tools/perf/Makefile test, or better, duplicate the test,
including just the CPI stuff in the new test, and then set NO_DWARF_CFI
and use it as the ifdef condition :-)

- Arnaldo