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[4/4] tools: perf: Fix linker error when libelf config is disabled

Message ID 20170719011839.99399-5-davidcc@google.com
State Superseded
Headers show
Series None | expand

Commit Message

David Carrillo-Cisneros July 19, 2017, 1:18 a.m. UTC 
From: Sudeep Holla <Sudeep.Holla@arm.com>


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

Jiri pointed out that both librt and libelf are not really required. So
this patch fixes the linker error by getting rid of unwanted libraries
in the linker stage.

Fixes: 209045adc2bb ("perf tools: add JVMTI agent library")
Acked-by: Jiri Olsa <jolsa@kernel.org>

Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Stephane Eranian <eranian@google.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>

Acked-by: David Carrillo-Cisneros <davidcc@google.com>

---
 tools/perf/Makefile.perf | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

-- 
2.13.2.932.g7449e964c-goog
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Patch

diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
index 100a6c1670c8..d66f90e6be5c 100644
--- a/tools/perf/Makefile.perf
+++ b/tools/perf/Makefile.perf
@@ -518,7 +518,7 @@  $(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 $@ $<
 endif
 
 $(patsubst perf-%,%.o,$(PROGRAMS)): $(wildcard */*.h)