linux-kernel - Re: [PATCH v6 05/11] perf tools: Separate local/remote libunwind config

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Date:	Mon, 30 May 2016 10:52:44 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	He Kuang <hekuang@...wei.com>
Cc:	peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
	alexander.shishkin@...ux.intel.com, wangnan0@...wei.com,
	jpoimboe@...hat.com, ak@...ux.intel.com, eranian@...gle.com,
	namhyung@...nel.org, adrian.hunter@...el.com,
	sukadev@...ux.vnet.ibm.com, masami.hiramatsu.pt@...achi.com,
	tumanova@...ux.vnet.ibm.com, kan.liang@...el.com,
	penberg@...nel.org, dsahern@...il.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 05/11] perf tools: Separate local/remote libunwind
 config

On Sat, May 28, 2016 at 11:59:54AM +0000, He Kuang wrote:

SNIP

> diff --git a/tools/perf/config/Makefile b/tools/perf/config/Makefile
> index 6f9f566..3a304a3 100644
> --- a/tools/perf/config/Makefile
> +++ b/tools/perf/config/Makefile
> @@ -354,10 +354,24 @@ ifeq ($(ARCH),powerpc)
>  endif
>  
>  ifndef NO_LIBUNWIND
> +  have_libunwind :=
>    ifneq ($(feature-libunwind), 1)
>      msg := $(warning No libunwind found. Please install libunwind-dev[el] >= 1.1 and/or set LIBUNWIND_DIR);
> +    NO_LOCAL_LIBUNWIND := 1
> +  else
> +    have_libunwind := 1
> +    CFLAGS += -DHAVE_LIBUNWIND_LOCAL_SUPPORT
> +    $(call detected,CONFIG_LOCAL_LIBUNWIND)
> +  endif
> +
> +  ifneq ($(have_libunwind), 1)
>      NO_LIBUNWIND := 1
> +  else
> +    CFLAGS += -I$(LIBUNWIND_DIR)/include
> +    LDFLAGS += -L$(LIBUNWIND_DIR)/lib

changelog says it's just switch, then why do we need to add above setup?

jirka