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Subject: Re: perf build error with gcc 10 on arm and aarch64
To:     Leo Yan <leo.yan@linaro.org>
CC:     <linux-kernel@vger.kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Ingo Molnar <mingo@redhat.com>,
        Arnaldo Carvalho de Melo <acme@kernel.org>,
        Mathieu Poirier <mathieu.poirier@linaro.org>,
        Mike Leach <mike.leach@linaro.org>,
        Suzuki Kuruppassery Poulose <suzuki.poulose@arm.com>
References: <2869c4f6-9adf-3d55-a41d-a42865ae56f2@mageia.org>
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 <20200505041050.GA8131@leoy-ThinkPad-X240s>
From:   Thomas Backlund <tmb@mageia.org>
Message-ID: <ed17a79e-81cd-8514-aaa7-13223bd1c789@mageia.org>
Date:   Tue, 5 May 2020 16:11:14 +0300
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Den 05-05-2020 kl. 07:10, skrev Leo Yan:
> 
> Hi Thomas,
> 
> [ + Mathieu/Mike/Suzuki ]
> 
> On Mon, May 04, 2020 at 10:22:27PM +0300, Thomas Backlund wrote:
>> This is building perf from kernel-5.6.10 on armv7hl and aarch64:
>>
>> Compiler is gcc 10.1.0-RC
>>
>>
>>    LD       perf-in.o
>> ld: arch/perf-in.o: in function `.LANCHOR0':
>> /home/iurt/rpmbuild/BUILD/kernel-arm/linux-5.6/tools/perf/util/include/../../util/cs-etm.h:118:
>> multiple definition of `traceid_list'; util/perf-in.o:/home/iurt/rpmbuild/BUILD/kernel-arm/linux-5.6/tools/perf/util/cs-etm.h:118:
>> first defined here
>> make[3]: *** [/home/iurt/rpmbuild/BUILD/kernel-arm/linux-5.6/tools/build/Makefile.build:145:
>> perf-in.o] Error 1
>>
>>    LD       perf-in.o
>> ld: arch/perf-in.o:/home/iurt/rpmbuild/BUILD/kernel-aarch64/linux-5.6/tools/perf/util/include/../../util/cs-etm.h:118:
>> multiple definition of `traceid_list'; util/perf-in.o:/home/iurt/rpmbuild/BUILD/kernel-aarch64/linux-5.6/tools/perf/util/cs-etm.h:118:
>> first defined here
>> make[3]: *** [/home/iurt/rpmbuild/BUILD/kernel-aarch64/linux-5.6/tools/build/Makefile.build:145:
>> perf-in.o] Error 1
>> make[2]: *** [Makefile.perf:616: perf-in.o] Error 2
>> make[1]: *** [Makefile.perf:225: sub-make] Error 2
>> make: *** [Makefile:70: all] Error 2
>>
>>
>> The same build succeeds with gcc 9.3.0
> 
> Thanks for reporting the issue.
> 
> Could you help confirm if below change can resolve this issue?

Yes,

fix confirmed on i586, x86_64, armv7hl and aarch64 builds

so I guess you can add:

Reported-by: Thomas Backlund <tmb@mageia.org>
Tested-by: Thomas Backlund <tmb@mageia.org>


> 
> Thanks,
> Leo
> 
> ---8<---
> 
> Subject: [PATCH] perf cs-etm: Move defined of traceid_list
> 
> The variable 'traceid_list' is defined in the header file cs-etm.h,
> if multiple C files include cs-etm.h the compiler might complaint for
> multiple definition of 'traceid_list'.
> 
> To fix multiple definition error, move the definition of 'traceid_list'
> into cs-etm.c.
> 
> Signed-off-by: Leo Yan <leo.yan@linaro.org>
> ---
>   tools/perf/util/cs-etm.c | 3 +++
>   tools/perf/util/cs-etm.h | 3 ---
>   2 files changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/tools/perf/util/cs-etm.c b/tools/perf/util/cs-etm.c
> index 62d2f9b9ce1b..381d9708e9bd 100644
> --- a/tools/perf/util/cs-etm.c
> +++ b/tools/perf/util/cs-etm.c
> @@ -94,6 +94,9 @@ struct cs_etm_queue {
>   	struct cs_etm_traceid_queue **traceid_queues;
>   };
> 
> +/* RB tree for quick conversion between traceID and metadata pointers */
> +static struct intlist *traceid_list;
> +
>   static int cs_etm__update_queues(struct cs_etm_auxtrace *etm);
>   static int cs_etm__process_queues(struct cs_etm_auxtrace *etm);
>   static int cs_etm__process_timeless_queues(struct cs_etm_auxtrace *etm,
> diff --git a/tools/perf/util/cs-etm.h b/tools/perf/util/cs-etm.h
> index 650ecc2a6349..4ad925d6d799 100644
> --- a/tools/perf/util/cs-etm.h
> +++ b/tools/perf/util/cs-etm.h
> @@ -114,9 +114,6 @@ enum cs_etm_isa {
>   	CS_ETM_ISA_T32,
>   };
> 
> -/* RB tree for quick conversion between traceID and metadata pointers */
> -struct intlist *traceid_list;
> -
>   struct cs_etm_queue;
> 
>   struct cs_etm_packet {
> --
> 2.17.1
>