linux-kernel - [tip:perf/urgent] tools build: Add -ldl to the disassembler-four-args feature test

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Date:   Thu, 2 May 2019 22:57:44 -0700
From:   tip-bot for Arnaldo Carvalho de Melo <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     adrian.hunter@...el.com, acme@...hat.com, hpa@...or.com,
        linux-kernel@...r.kernel.org, songliubraving@...com,
        tglx@...utronix.de, namhyung@...nel.org, tmb@...eia.org,
        mingo@...nel.org, jolsa@...nel.org
Subject: [tip:perf/urgent] tools build: Add -ldl to the
 disassembler-four-args feature test

Commit-ID:  c638417e1a64b1f43ebab589e697d1cd1a127a74
Gitweb:     https://git.kernel.org/tip/c638417e1a64b1f43ebab589e697d1cd1a127a74
Author:     Arnaldo Carvalho de Melo <acme@...hat.com>
AuthorDate: Wed, 1 May 2019 16:27:00 -0400
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Thu, 2 May 2019 16:00:20 -0400

tools build: Add -ldl to the disassembler-four-args feature test

Thomas Backlund reported that the perf build was failing on the Mageia 7
distro, that is because it uses:

  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

Mageia 7 uses these linker flags:
  $ rpm --eval %ldflags
    -Wl,--as-needed -Wl,--no-undefined -Wl,-z,relro -Wl,-O1 -Wl,--build-id -Wl,--enable-new-dtags

So add -ldl to this feature LDFLAGS.

Reported-by: Thomas Backlund <tmb@...eia.org>
Tested-by: Thomas Backlund <tmb@...eia.org>
Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Song Liu <songliubraving@...com>
Link: https://lkml.kernel.org/r/20190501173158.GC21436@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.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 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)
 
 FEATURE_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