Re: [tip:perf/core] perf probe: Don't compile CFI related code if elfutils is old

[Stephane Eranian]

On Tue, May 18, 2010 at 11:35 AM, Robert Richter <robert.richter@xxxxxxx> wrote:
> On 17.05.10 21:57:38, tip-bot for Masami Hiramatsu wrote:
>> Commit-ID: Â7752f1b096e13991f20b59fd11ba73da3809d93c
>> Gitweb: Â Â http://git.kernel.org/tip/7752f1b096e13991f20b59fd11ba73da3809d93c
>> Author: Â Â Masami Hiramatsu <mhiramat@xxxxxxxxxx>
>> AuthorDate: Mon, 10 May 2010 13:12:07 -0400
>> Committer: ÂArnaldo Carvalho de Melo <acme@xxxxxxxxxx>
>> CommitDate: Mon, 17 May 2010 22:13:51 -0300
>>
>> perf probe: Don't compile CFI related code if elfutils is old
>>
>> Check elfutils version, and if it is old don't compile CFI analysis code. This
>> allows to compile perf with old elfutils.
>>
>> Signed-off-by: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
>> Tested-by: Stephane Eranian <eranian@xxxxxxxxxx>
>> Reported-by: Robert Richter <robert.richter@xxxxxxx>
>> Cc: Ingo Molnar <mingo@xxxxxxx>
>> LKML-Reference: <20100510171207.26029.97604.stgit@xxxxxxxxxxxxxxxxxxxxxxx>
>> Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
>> ---
>
> I think this patch is not needed as we came up with an alternative
> solution with commit:
>
> Â6b3c4ef perf probe: Check older elfutils and set NO_DWARF
>
But I am compiling tip, so this patch is in and I still got the problem.
It is because the test program does not check for Dwarf_CFI so it
assumes you have the right version of libdw.

If I understand Masami's patch, you can still compile dwarf support
in despite the lack of Dwarf_CFI.
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