linux-kernel - [PATCH 05/43] perf build: Disable make's built-in rules

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Date:	Fri, 13 Feb 2015 17:48:54 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	linux-kernel@...r.kernel.org, Jiri Olsa <jolsa@...nel.org>,
	Alexis Berlemont <alexis.berlemont@...il.com>,
	Borislav Petkov <bp@...en8.de>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Stephane Eranian <eranian@...gle.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: [PATCH 05/43] perf build: Disable make's built-in rules

From: Jiri Olsa <jolsa@...nel.org>

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@...nel.org>
Tested-by: Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
Tested-by: Will Deacon <will.deacon@....com>
Cc: Alexis Berlemont <alexis.berlemont@...il.com>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Corey Ashford <cjashfor@...ux.vnet.ibm.com>
Cc: David Ahern <dsahern@...il.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Stephane Eranian <eranian@...gle.com>
Link: http://lkml.kernel.org/n/tip-fr54ist3woy7efz6z3m720vb@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/Makefile.perf | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
index aa6a50447c32..0a256fe193ce 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
-- 
1.9.3

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