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

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Message-ID: <20190501173158.GC21436@kernel.org>
Date:   Wed, 1 May 2019 13:31:58 -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 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