We don't use any built-in rules, so we can disable
make's checks for that and build faster.

Signed-off-by: Jiri Olsa <[email protected]>
Cc: Alexis Berlemont <[email protected]>
Cc: Arnaldo Carvalho de Melo <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Corey Ashford <[email protected]>
Cc: David Ahern <[email protected]>
Cc: Frederic Weisbecker <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Stephane Eranian <[email protected]>
---
 tools/perf/Makefile.perf | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
index aa6a50447c32..8087f97ee4e8 100644
--- a/tools/perf/Makefile.perf
+++ b/tools/perf/Makefile.perf
@@ -84,6 +84,10 @@ ifneq ($(OUTPUT),)
 #$(info Determined 'OUTPUT' to be $(OUTPUT))
 endif
 
+# Do not use make's built-in rules
+# (this increases performance and avoids hard-to-debug behaviour);
+MAKEFLAGS += -r
+
 $(OUTPUT)PERF-VERSION-FILE: ../../.git/HEAD
        @$(SHELL_PATH) util/PERF-VERSION-GEN $(OUTPUT)
        @touch $(OUTPUT)PERF-VERSION-FILE
-- 
1.9.3

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