linux-kernel - [PATCH V2] perf: Fix parallel build

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Date:	Thu, 20 Sep 2012 20:12:50 -0500
From:	Eric Sandeen <sandeen@...hat.com>
To:	kernel list <linux-kernel@...r.kernel.org>
CC:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Namhyung Kim <namhyung@...nel.org>
Subject: [PATCH V2] perf: Fix parallel build

Parallel builds of perf were failing for me on a 32p box, with:

    * new build flags or prefix
util/pmu.l:7:23: error: pmu-bison.h: No such file or directory

...

make: *** [util/pmu-flex.o] Error 1
make: *** Waiting for unfinished jobs....

This can pretty quickly be seen by adding a sleep in front of
the bison calls in tools/perf/Makefile and running make -j4 on a
smaller box i.e.:

	sleep 10; $(QUIET_BISON)$(BISON) -v util/pmu.y -d -o $(OUTPUT)util/pmu-bison.c

Adding the following dependencies fixes it for me.

Signed-off-by: Eric Sandeen <sandeen@...hat.com>
---

V2: Fix other bison dependency caught by Namhyung Kim <namhyung@...nel.org>, thanks.

diff --git a/tools/perf/Makefile b/tools/perf/Makefile
index 35655c3..8d883de 100644
--- a/tools/perf/Makefile
+++ b/tools/perf/Makefile
@@ -221,13 +221,13 @@ export PERL_PATH
 FLEX = flex
 BISON= bison
 
-$(OUTPUT)util/parse-events-flex.c: util/parse-events.l
+$(OUTPUT)util/parse-events-flex.c: util/parse-events.l util/parse-events-bison.c
 	$(QUIET_FLEX)$(FLEX) --header-file=$(OUTPUT)util/parse-events-flex.h $(PARSER_DEBUG_FLEX) -t util/parse-events.l > $(OUTPUT)util/parse-events-flex.c
 
 $(OUTPUT)util/parse-events-bison.c: util/parse-events.y
 	$(QUIET_BISON)$(BISON) -v util/parse-events.y -d $(PARSER_DEBUG_BISON) -o $(OUTPUT)util/parse-events-bison.c
 
-$(OUTPUT)util/pmu-flex.c: util/pmu.l
+$(OUTPUT)util/pmu-flex.c: util/pmu.l util/pmu-bison.c
 	$(QUIET_FLEX)$(FLEX) --header-file=$(OUTPUT)util/pmu-flex.h -t util/pmu.l > $(OUTPUT)util/pmu-flex.c
 
 $(OUTPUT)util/pmu-bison.c: util/pmu.y

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