netdev - Re: [PATCH v7 perf,bpf 11/15] perf: add -lopcodes to feature-libbfd

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Date:   Thu, 7 Mar 2019 23:47:02 +0000
From:   Song Liu <songliubraving@...com>
To:     Stanislav Fomichev <sdf@...ichev.me>
CC:     "bpf@...r.kernel.org" <bpf@...r.kernel.org>,
        Networking <netdev@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        "Alexei Starovoitov" <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        "Kernel Team" <Kernel-team@...com>,
        Peter Zijlstra <peterz@...radead.org>,
        "Arnaldo Carvalho de Melo" <acme@...hat.com>,
        "jolsa@...nel.org" <jolsa@...nel.org>,
        "namhyung@...nel.org" <namhyung@...nel.org>
Subject: Re: [PATCH v7 perf,bpf 11/15] perf: add -lopcodes to feature-libbfd



> On Mar 7, 2019, at 3:26 PM, Stanislav Fomichev <sdf@...ichev.me> wrote:
> 
> On 03/07, Song Liu wrote:
>> Both libbfd and libopcodes are distributed with binutil-dev/devel. When
>> libbfd presents, it is OK to assume libopcodes also presents. This has
>> been a safe assumption for bpftool.
>> 
>> This patch adds -lopcodes to perf/Makefile.config. libopcodes will be
>> used in the next commit for bpf annotation.
>> 
>> Signed-off-by: Song Liu <songliubraving@...com>
>> ---
>> tools/perf/Makefile.config | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
>> 
>> diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
>> index b441c88cafa1..e0bafbc273af 100644
>> --- a/tools/perf/Makefile.config
>> +++ b/tools/perf/Makefile.config
>> @@ -701,7 +701,7 @@ else
>> endif
>> 
>> ifeq ($(feature-libbfd), 1)
>> -  EXTLIBS += -lbfd
>> +  EXTLIBS += -lbfd -lopcodes
> I think you need to add -lopcodes to the other feature checks as
> well (to work on the systems which require -liberty and/or -lz for
> libfd):
> 
> --
> 
> diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
> index b441c88cafa1..3fa2f5d7d54f 100644
> --- a/tools/perf/Makefile.config
> +++ b/tools/perf/Makefile.config
> @@ -701,7 +701,7 @@ else
> endif
> 
> ifeq ($(feature-libbfd), 1)
> -  EXTLIBS += -lbfd
> +  EXTLIBS += -lbfd -lopcodes
> else
>   # we are on a system that requires -liberty and (maybe) -lz
>   # to link against -lbfd; test each case individually here
> @@ -712,10 +712,10 @@ else
>   $(call feature_check,libbfd-liberty-z)
> 
>   ifeq ($(feature-libbfd-liberty), 1)
> -    EXTLIBS += -lbfd -liberty
> +    EXTLIBS += -lbfd -lopcodes -liberty
>   else
>     ifeq ($(feature-libbfd-liberty-z), 1)
> -      EXTLIBS += -lbfd -liberty -lz
> +      EXTLIBS += -lbfd -lopcodes -liberty -lz
>     endif
>   endif
> endif

Good point! I will fix it in next version. 

Thanks,
Song

> 
>> else
>>   # we are on a system that requires -liberty and (maybe) -lz
>>   # to link against -lbfd; test each case individually here
>> -- 
>> 2.17.1