From mboxrd@z Thu Jan  1 00:00:00 1970
From: Olivier MATZ <olivier.matz-pdR9zngts4EAvxtiuMwx3w@public.gmane.org>
Subject: Re: Pcap question
Date: Mon, 03 Mar 2014 22:31:38 +0100
Message-ID: <5314F4BA.7020507@6wind.com>
References: <CA+Typ9mqB4nQ1MoztqSKQ1QvQX_nWQHDybw3tTuyuqghySLGRQ@mail.gmail.com>
 <5313905E.7000603@6wind.com>
 <CA+Typ9kW8gp4fLL7=q95ZbBjB030hAjMzh-CBn_iydWC1mPT4w@mail.gmail.com>
 <5314E6F4.2090709@6wind.com>
 <CA+Typ9kTXGfhs-t+NY+1A-Ui645JPKKSGkim9BjAU-h-d+xuNQ@mail.gmail.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Cc: dev-VfR2kkLFssw@public.gmane.org
To: Meir Tseitlin <mirots-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Return-path: <dev-bounces-VfR2kkLFssw@public.gmane.org>
In-Reply-To: <CA+Typ9kTXGfhs-t+NY+1A-Ui645JPKKSGkim9BjAU-h-d+xuNQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
List-Id: patches and discussions about DPDK <dev.dpdk.org>
List-Unsubscribe: <http://dpdk.org/ml/options/dev>,
 <mailto:dev-request-VfR2kkLFssw@public.gmane.org?subject=unsubscribe>
List-Archive: <http://dpdk.org/ml/archives/dev/>
List-Post: <mailto:dev-VfR2kkLFssw@public.gmane.org>
List-Help: <mailto:dev-request-VfR2kkLFssw@public.gmane.org?subject=help>
List-Subscribe: <http://dpdk.org/ml/listinfo/dev>,
 <mailto:dev-request-VfR2kkLFssw@public.gmane.org?subject=subscribe>
Errors-To: dev-bounces-VfR2kkLFssw@public.gmane.org
Sender: "dev" <dev-bounces-VfR2kkLFssw@public.gmane.org>

Hi Meir,

On 03/03/2014 10:09 PM, Meir Tseitlin wrote:
> -Wl,-lrte_pmd_pcap -Wl,-L/usr/local/lib -Wl,-Wl,-rpath,/usr/local/lib
> -Wl,-lpcap

The problem is related to the lines above. They are generated in
rte.app.mk:

   ifeq ($(CONFIG_RTE_LIBRTE_PMD_PCAP),y)
   LDLIBS += -lrte_pmd_pcap
   LIBPCAP_LDFLAGS ?= $(shell pcap-config --libs)
   $(if $(LIBPCAP_LDFLAGS),,$(error LIBPCAP_LDFLAGS is undefined))
   LDLIBS += $(LIBPCAP_LDFLAGS)
   endif

The output of "pcap-config --libs" on your computer is probably:
   -L/usr/local/lib -Wl,-rpath,/usr/local/lib -lpcap

The problem is that the DPDK makefile add the "-Wl," to convert the
linker arguments into gcc arguments. You may want to replace the
code above by:

   ifeq ($(CONFIG_RTE_LIBRTE_PMD_PCAP),y)
   LDLIBS += -lrte_pmd_pcap
   repl := -Wl,%
   LIBPCAP_LDFLAGS ?= $(patsubst -Wl$(comma),%,$(shell pcap-config --libs))
   $(if $(LIBPCAP_LDFLAGS),,$(error LIBPCAP_LDFLAGS is undefined))
   LDLIBS += $(LIBPCAP_LDFLAGS)
   endif

I don't know if it's the proper way to fix this. Maybe rte.app.mk
should take care of not adding "-Wl," if it's already there.

Regards,
Olivier