* [PATCH] perf build: Fix LTO build of libperf-jvmti.so
@ 2026-07-01 4:21 Trevor Allison
0 siblings, 0 replies; only message in thread
From: Trevor Allison @ 2026-07-01 4:21 UTC (permalink / raw)
To: peterz, mingo, acme, namhyung
Cc: mark.rutland, alexander.shishkin, jolsa, irogers, adrian.hunter,
james.clark, linux-perf-users, linux-kernel, tallison
Linking libperf-jvmti.so through jvmti-in.o (ld -r) breaks LTO when
-flto is passed via LDFLAGS. Link the JVMTI object files directly
instead, and pass any LTO flags from LDFLAGS to the JVMTI compile step
Signed-off-by: Trevor Allison <tallison@redhat.com>
---
tools/perf/Makefile.perf | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
index 3f0544d37a7f..bc66d711fa39 100644
--- a/tools/perf/Makefile.perf
+++ b/tools/perf/Makefile.perf
@@ -686,10 +686,12 @@ ifndef NO_JVMTI
LIBJVMTI_IN := $(OUTPUT)jvmti/jvmti-in.o
$(LIBJVMTI_IN): prepare FORCE
- $(Q)$(MAKE) -f $(srctree)/tools/build/Makefile.build dir=jvmti obj=jvmti
+ $(Q)$(MAKE) -f $(srctree)/tools/build/Makefile.build dir=jvmti obj=jvmti \
+ CFLAGS="$(CFLAGS) $(filter -flto% -ffat-lto-objects,$(LDFLAGS))"
$(OUTPUT)$(LIBJVMTI): $(LIBJVMTI_IN)
- $(QUIET_LINK)$(CC) $(LDFLAGS) -shared -Wl,-soname -Wl,$(LIBJVMTI) -o $@ $<
+ $(QUIET_LINK)$(CC) $(LDFLAGS) -shared -Wl,-soname -Wl,$(LIBJVMTI) -o $@ \
+ $(addprefix $(OUTPUT)jvmti/,libjvmti.o jvmti_agent.o libstring.o libctype.o)
endif
$(patsubst perf-%,%.o,$(PROGRAMS)): $(wildcard */*.h)
--
2.50.1 (Apple Git-155)
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2026-07-01 4:21 [PATCH] perf build: Fix LTO build of libperf-jvmti.so Trevor Allison
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