[PATCH] tools: perf: fix linker error when libelf config is disabled

Sudeep Holla
2017-01-04T13:56:08Z

When libelf is disabled in the configuration, we get the following
linker error:
LINK libperf-jvmti.so
ld: cannot find -lelf
Makefile.perf:515: recipe for target 'libperf-jvmti.so' failed

This patch fixes the error by using the configuration macro EXTLIBS.

Fixes: d4dfdf00d43e ("perf jvmti: Plug compilation into perf build")
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
---
tools/perf/Makefile.perf | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
index 8fc24824705e..6defd9b00bc4 100644
--- a/tools/perf/Makefile.perf
+++ b/tools/perf/Makefile.perf
@@ -512,7 +512,7 @@ $(LIBJVMTI_IN): FORCE
$(Q)$(MAKE) -f $(srctree)/tools/build/Makefile.build dir=jvmti obj=jvmti

$(OUTPUT)$(LIBJVMTI): $(LIBJVMTI_IN)
- $(QUIET_LINK)$(CC) -shared -Wl,-soname -Wl,$(LIBJVMTI) -o $@ $< -lelf -lrt
+ $(QUIET_LINK)$(CC) -shared -Wl,-soname -Wl,$(LIBJVMTI) -o $@ $< $(EXTLIBS) -lrt
endif

$(patsubst perf-%,%.o,$(PROGRAMS)): $(wildcard */*.h)
--
2.7.4