linux-kernel - Re: [PATCH] perf build: Disable libdw DWARF unwind when built with NO

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Message-ID: <20150511133604.GE13337@krava.redhat.com>
Date:	Mon, 11 May 2015 15:36:04 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	"Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf build: Disable libdw DWARF unwind when built with
 NO_DWARF

On Fri, May 08, 2015 at 04:44:04PM -0300, Arnaldo Carvalho de Melo wrote:
> Em Wed, Apr 29, 2015 at 04:45:31PM +0530, Naveen N. Rao escreveu:
> > We get a linker error if we try to build with NO_DWARF since we build
> > util/unwind-libdw.c, but do not include -ldw
> 
> Thanks, applied, but adding Jiri to the CC list, lets see if he pokes
> some hole on this one...

it seems reasonable ;-) ack

jirka

> 
> - Arnaldo
>  
> > Signed-off-by: Naveen N. Rao <naveen.n.rao@...ux.vnet.ibm.com>
> > ---
> >  tools/perf/config/Makefile | 4 ++++
> >  1 file changed, 4 insertions(+)
> > 
> > diff --git a/tools/perf/config/Makefile b/tools/perf/config/Makefile
> > index 59a98c6..d47c4dc 100644
> > --- a/tools/perf/config/Makefile
> > +++ b/tools/perf/config/Makefile
> > @@ -268,6 +268,10 @@ else
> >    endif # libelf support
> >  endif # NO_LIBELF
> >  
> > +ifdef NO_DWARF
> > +  NO_LIBDW_DWARF_UNWIND := 1
> > +endif
> > +
> >  ifndef NO_LIBELF
> >    CFLAGS += -DHAVE_LIBELF_SUPPORT
> >    EXTLIBS += -lelf
> > -- 
> > 2.3.5
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