[PATCH] perf, tools: Support static linking with libdw

[Andi Kleen <andi@firstfloor.org>]

From: Andi Kleen <ak@linux.intel.com>

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@linux.intel.com>
---
 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 463ed8f..a8a5b7f 100644
--- a/tools/build/feature/Makefile
+++ b/tools/build/feature/Makefile
@@ -69,8 +69,13 @@ 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 094ddae..e376a45 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
-- 
2.4.3