linux-kernel - Re: [PATCH] perf tool: Fix build for NO

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Date:	Wed, 03 Oct 2012 22:29:48 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Ben Guthro <ben.guthro@...il.com>,
	Ian Munsie <imunsie@....ibm.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	Namhyung Kim <namhyung.kim@....com>
Subject: Re: [PATCH] perf tool: Fix build for NO_DWARF=1 case

Hi all,

On Wed, 3 Oct 2012 12:29:28 +0200, Jiri Olsa wrote:
> On Tue, Oct 02, 2012 at 06:45:36PM -0300, Arnaldo Carvalho de Melo wrote:
>> Em Tue, Oct 02, 2012 at 03:10:49PM +0200, Jiri Olsa escreveu:
>> > On Tue, Oct 02, 2012 at 07:39:23AM -0400, Ben Guthro wrote:
>> > > Actually - I hadn't noticed these warnings before.
>> 
>> > > After installing libdw-dev - the perf build completed successfully.
>> > > Perhaps this should be fatal, rather than a warning?
>> 
>> > attached patch fixies the issue for me. Adding Arnaldo to the loop.
>> 
>> [acme@...dy linux]$ make -j8 -C tools/perf/ LIBUNWIND_DIR=/opt/libunwind O=/home/acme/git/build/perf install
>> cc1: warnings being treated as errors
>> arch/x86/util/dwarf-regs.c:72: error: no previous prototype for ‘get_arch_regstr’
>> make: *** [/home/acme/git/build/perf/arch/x86/util/dwarf-regs.o] Error 1
>> make: *** Waiting for unfinished jobs....
>> make: Leaving directory `/home/git/linux/tools/perf'
>> [acme@...dy linux]$
>> 
>> - Arnaldo
>
> ugh.. forgot the way you build perf ;)
> (also smells like 'automated make test' adept)
>
> Anyway, there's Makefile dependency on PERF_HAVE_DWARF_REGS which
> is defined in arch/x86/Makefile.
>
> So, there's only one right place for '-include arch/$(ARCH)/Makefile'.
> We should think of some other solution, since this seems fragile.
>
> I checked your make and simple make with attached patch
> (only x86_64 arch, and with and without libdw installed).

I posted similar patch few days ago and it slipped into acme/perf/core:

  https://lkml.org/lkml/2012/9/28/194

Can you reproduce it with above change?  Anyway, my apologies, sorry for
the inconvenience.

Thanks,
Namhyung
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