[tip:perf/core] perf build: Disable make's built-in rules

[tip-bot for Jiri Olsa]

Commit-ID:  6dd280cdb8a2cf53deacd6240707ec2f22222b20
Gitweb:     http://git.kernel.org/tip/6dd280cdb8a2cf53deacd6240707ec2f22222b20
Author:     Jiri Olsa <jolsa@xxxxxxxxxx>
AuthorDate: Sat, 10 Jan 2015 21:43:32 +0100
Committer:  Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Thu, 12 Feb 2015 11:24:46 -0300

perf build: Disable make's built-in rules

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 <jolsa@xxxxxxxxxx>
Tested-by: Sukadev Bhattiprolu <sukadev@xxxxxxxxxxxxxxxxxx>
Tested-by: Will Deacon <will.deacon@xxxxxxx>
Cc: Alexis Berlemont <alexis.berlemont@xxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Corey Ashford <cjashfor@xxxxxxxxxxxxxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Stephane Eranian <eranian@xxxxxxxxxx>
Link: http://lkml.kernel.org/n/tip-fr54ist3woy7efz6z3m720vb@xxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/perf/Makefile.perf | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
index aa6a504..0a256fe 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 improves 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
--
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