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

[Masami H. <mhi...@re...>]

Arnaldo Carvalho de Melo wrote:
> 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 <ro...@re...>
>> 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 :-)

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.

Thank you,

-- 
Masami Hiramatsu
e-mail: mhi...@re...