linux-kernel - Re: perf build error with gcc 10 on arm and aarch64

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Date:   Tue, 5 May 2020 21:38:28 +0800
From:   Leo Yan <leo.yan@...aro.org>
To:     Thomas Backlund <tmb@...eia.org>
Cc:     linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Mike Leach <mike.leach@...aro.org>,
        Suzuki Kuruppassery Poulose <suzuki.poulose@....com>
Subject: Re: perf build error with gcc 10 on arm and aarch64

On Tue, May 05, 2020 at 04:11:14PM +0300, Thomas Backlund wrote:
> 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@...eia.org>
> Tested-by: Thomas Backlund <tmb@...eia.org>

Thanks, Thomas!  Have sent formal patch with your and Mike's tags.

Leo