[PATCH] perf tools: Suppress 'rm dlfilter' build message

[Adrian Hunter]

The following build message:

	rm dlfilters/dlfilter-test-api-v0.o

is unwanted.

The object fle is being treated as an intermediate file and being
automatically removed. Mark the object file as .SECONDARY to prevent
removal and hence the message.

Signed-off-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
---
 tools/perf/Makefile.perf | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
index e04313c4d840..ab8cb17d9ec5 100644
--- a/tools/perf/Makefile.perf
+++ b/tools/perf/Makefile.perf
@@ -787,6 +787,8 @@ $(OUTPUT)dlfilters/%.o: dlfilters/%.c include/perf/perf_dlfilter.h
 	$(Q)$(MKDIR) -p $(OUTPUT)dlfilters
 	$(QUIET_CC)$(CC) -c -Iinclude $(EXTRA_CFLAGS) -o $@ -fpic $<
 
+.SECONDARY: $(DLFILTERS:.so=.o)
+
 $(OUTPUT)dlfilters/%.so: $(OUTPUT)dlfilters/%.o
 	$(QUIET_LINK)$(CC) $(EXTRA_CFLAGS) -shared -o $@ $<
 
-- 
2.25.1