linux-kernel - Re: perf build broken in 5.1-rc7

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Date:   Wed, 1 May 2019 16:26:34 -0400
From:   Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To:     Thomas Backlund <tmb@...eia.org>
Cc:     Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>,
        Song Liu <liu.song.a23@...il.com>,
        Linux List Kernel Mailing <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>
Subject: Re: perf build broken in 5.1-rc7

Em Wed, May 01, 2019 at 11:20:02PM +0300, Thomas Backlund escreveu:
> 
> Den 01-05-2019 kl. 20:31, skrev Arnaldo Carvalho de Melo:
> > Em Wed, May 01, 2019 at 05:09:59PM +0300, Thomas Backlund escreveu:
> > > Den 01-05-2019 kl. 16:07, skrev Arnaldo Carvalho de Melo:
> > > > Em Tue, Apr 30, 2019 at 04:31:14PM +0300, Thomas Backlund escreveu:
> > > > Can you check the output for
> > > > /tmp/build/perf/feature/test-disassembler-four-args.make.output in your
> > > > system? And also check what is the prototype for the disassembler()
> > > > routine on mageia7?
> > > I guess this is what fails the test:
> > > cat /tmp/build/perf/feature/test-disassembler-four-args.make.output
> > > /usr/bin/ld: /usr/lib64/libbfd.a(plugin.o): in function `try_load_plugin':
> > > /home/iurt/rpmbuild/BUILD/binutils-2.32/objs/bfd/../../bfd/plugin.c:243:
> > > undefined reference to `dlopen'
> > > /usr/bin/ld:
> > > /home/iurt/rpmbuild/BUILD/binutils-2.32/objs/bfd/../../bfd/plugin.c:271:
> > > undefined reference to `dlsym'
> > > /usr/bin/ld:
> > > /home/iurt/rpmbuild/BUILD/binutils-2.32/objs/bfd/../../bfd/plugin.c:256:
> > > undefined reference to `dlclose'
> > > /usr/bin/ld:
> > > /home/iurt/rpmbuild/BUILD/binutils-2.32/objs/bfd/../../bfd/plugin.c:246:
> > > undefined reference to `dlerror'
> > > as we allow dynamic linking and loading
> > > And we use linker flags:
> > > rpm --eval %ldflags
> > >   -Wl,--as-needed -Wl,--no-undefined -Wl,-z,relro -Wl,-O1 -Wl,--build-id
> > > -Wl,--enable-new-dtags
> > Would this help?
> > 
> > diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
> > index fe3f97e342fa..6d65874e16c3 100644
> > --- a/tools/perf/Makefile.config
> > +++ b/tools/perf/Makefile.config
> > @@ -227,7 +227,7 @@ FEATURE_CHECK_LDFLAGS-libpython-version := $(PYTHON_EMBED_LDOPTS)
> >   EATURE_CHECK_LDFLAGS-libaio = -lrt
> > -FEATURE_CHECK_LDFLAGS-disassembler-four-args = -lbfd -lopcodes
> > +FEATURE_CHECK_LDFLAGS-disassembler-four-args = -lbfd -lopcodes -ldl
> >   CFLAGS += -fno-omit-frame-pointer
> >   CFLAGS += -ggdb3
> > 
> 
> Yeah, that fixes it
> 
> and /tmp/build/perf/feature/test-disassembler-four-args.make.output is now empty as wanted.
> 
> 
> So I guess:
> 
> Reported-by: Thomas Backlund <tmb@...eia.org>
> 
> Tested-by: Thomas Backlund <tmb@...eia.org>

Great, thanks for testing!

- Arnaldo
 
> 
> 
> Thanks!
> 
> 
> --
> 
> Thomas
> 

-- 

- Arnaldo