[tip:perf/core] perf tools: Support static linking with libdw

[tip-bot for Andi Kleen]

Commit-ID:  7aec51cbf0646cc15d719b08caea931576dc7f2a
Gitweb:     http://git.kernel.org/tip/7aec51cbf0646cc15d719b08caea931576dc7f2a
Author:     Andi Kleen <ak@xxxxxxxxxxxxxxx>
AuthorDate: Wed, 12 Aug 2015 15:48:37 -0700
Committer:  Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Thu, 13 Aug 2015 14:49:11 -0300

perf tools: Support static linking with libdw

The Fedora 22 version of libdw requires a couple of extra libraries to
link. With a dynamic link the dependencies are pulled in automatically,
but this doesn't work for static linking. Add the needed libraries
explicitely to the feature probe and the Makefile.

v2: Explicitly check for static linking and only add the dependencies
    when -static is set. This is to avoid regressions on Arnaldo's system.

Signed-off-by: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Link: http://lkml.kernel.org/r/1439419717-20601-1-git-send-email-andi@xxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/build/feature/Makefile | 7 ++++++-
 tools/perf/config/Makefile   | 6 +++++-
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/tools/build/feature/Makefile b/tools/build/feature/Makefile
index 1c0d69f..74ca420 100644
--- a/tools/build/feature/Makefile
+++ b/tools/build/feature/Makefile
@@ -70,8 +70,13 @@ test-libelf.bin:
 test-glibc.bin:
 	$(BUILD)
 
+DWARFLIBS := -ldw
+ifeq ($(findstring -static,${LDFLAGS}),-static)
+DWARFLIBS += -lelf -lebl -lz -llzma -lbz2
+endif
+
 test-dwarf.bin:
-	$(BUILD) -ldw
+	$(BUILD) $(DWARFLIBS)
 
 test-libelf-mmap.bin:
 	$(BUILD) -lelf
diff --git a/tools/perf/config/Makefile b/tools/perf/config/Makefile
index 823195a..827557f 100644
--- a/tools/perf/config/Makefile
+++ b/tools/perf/config/Makefile
@@ -297,7 +297,11 @@ ifndef NO_LIBELF
     else
       CFLAGS += -DHAVE_DWARF_SUPPORT $(LIBDW_CFLAGS)
       LDFLAGS += $(LIBDW_LDFLAGS)
-      EXTLIBS += -ldw
+      DWARFLIBS := -ldw
+      ifeq ($(findstring -static,${LDFLAGS}),-static)
+	DWARFLIBS += -lelf -lebl -lz -llzma -lbz2
+      endif
+      EXTLIBS += ${DWARFLIBS}
       $(call detected,CONFIG_DWARF)
     endif # PERF_HAVE_DWARF_REGS
   endif # NO_DWARF
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