linux-kernel - [tip:perf/core] perf tools: Fix static linking with libunwind

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Date:   Thu, 24 Aug 2017 01:25:03 -0700
From:   tip-bot for Konstantin Khlebnikov <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     acme@...hat.com, tglx@...utronix.de, khlebnikov@...dex-team.ru,
        alexander.shishkin@...ux.intel.com, peterz@...radead.org,
        hpa@...or.com, linux-kernel@...r.kernel.org, mingo@...nel.org
Subject: [tip:perf/core] perf tools: Fix static linking with libunwind

Commit-ID:  60913e005c8d19ec5187a638eafdd088509dfb9e
Gitweb:     http://git.kernel.org/tip/60913e005c8d19ec5187a638eafdd088509dfb9e
Author:     Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
AuthorDate: Sun, 20 Aug 2017 14:39:32 +0300
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Tue, 22 Aug 2017 13:24:55 -0300

perf tools: Fix static linking with libunwind

* libunwind-x86_64 must be linked before libunwind
* libunwind requires liblzma
* static libunwind conflicts with static libgcc_eh

Signed-off-by: Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Link: http://lkml.kernel.org/r/150322917247.129799.14247751517961953155.stgit@buzz
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/Makefile.config | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
index bb4735b..6a64c6b 100644
--- a/tools/perf/Makefile.config
+++ b/tools/perf/Makefile.config
@@ -35,7 +35,7 @@ ifeq ($(SRCARCH),x86)
   ifeq (${IS_64_BIT}, 1)
     CFLAGS += -DHAVE_ARCH_X86_64_SUPPORT -DHAVE_SYSCALL_TABLE -I$(OUTPUT)arch/x86/include/generated
     ARCH_INCLUDE = ../../arch/x86/lib/memcpy_64.S ../../arch/x86/lib/memset_64.S
-    LIBUNWIND_LIBS = -lunwind -lunwind-x86_64
+    LIBUNWIND_LIBS = -lunwind-x86_64 -lunwind -llzma
     $(call detected,CONFIG_X86_64)
   else
     LIBUNWIND_LIBS = -lunwind-x86 -llzma -lunwind
@@ -505,6 +505,10 @@ ifndef NO_LOCAL_LIBUNWIND
   EXTLIBS += $(LIBUNWIND_LIBS)
   LDFLAGS += $(LIBUNWIND_LIBS)
 endif
+ifeq ($(findstring -static,${LDFLAGS}),-static)
+  # gcc -static links libgcc_eh which contans piece of libunwind
+  LIBUNWIND_LDFLAGS += -Wl,--allow-multiple-definition
+endif
 
 ifndef NO_LIBUNWIND
   CFLAGS  += -DHAVE_LIBUNWIND_SUPPORT