linux-kernel - Re: perf and libdwarf on debian

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Date:	Wed, 16 Dec 2009 14:05:13 -0500
From:	Masami Hiramatsu <mhiramat@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Borislav Petkov <borislav.petkov@....com>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org
Subject: Re: perf and libdwarf on debian



Peter Zijlstra wrote:
> On Wed, 2009-12-16 at 14:54 +0100, Borislav Petkov wrote:
>> Hi,
>>
>> even after installing libdwarf-dev on my debian box here, make in tools/perf/
>> still complains that it cannot find libdwarf:
>>
>> Makefile:491: No libdwarf.h found or old libdwarf.h found, disables dwarf support. Please install libdwarf-dev/libdwarf-devel >= 20081231
>>
>> The problem is that the include path on debian is not
>> /usr/include/libdwarf/ but simply /usr/include because the debian
>> package libdwarf-dev puts the headers straight into /usr/include.
>>
>> Now, fixing this in the build system could get ugly and too much (see
>> below), IMHO, so how about adding a README file in <tools/perf/>
>> which explains that on Debian-like systems, one should mkdir
>> /usr/include/libdwarf/ and symlink libdwarf.h and dwarf.h into it?
>>
>> There could be a better solution though...?
> 
> Yeah, like file a bug with RH for placing them in such an utterly stupid
> location.
> 
> Also, I'd not bother with testing debian, just do
> 
> #include <dwarf.h>
> 
> and simply add -I/usr/include/libdwarf to CPPFLAGS or something like
> that.

Ah, right, I was stupid!

Masami Hiramatsu wrote:
> e.g.
> 
> ifeq ($(shell sh -c "(test -d /usr/include/libdwarf/ && echo y)", y)
> 	BASIC_CFLAGS += -I /usr/include/libdwarf 
> endif

So, it just need;

BASIC_CFLAGS += -I/usr/include/libdwarf 

And including just libdwarf.h and dwarf.h.


Thank you,

-- 
Masami Hiramatsu

Software Engineer
Hitachi Computer Products (America), Inc.
Software Solutions Division

e-mail: mhiramat@...hat.com

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