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

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Date:	Thu, 20 Sep 2012 20:08:19 -0500
From:	Eric Sandeen <sandeen@...hat.com>
To:	Namhyung Kim <namhyung@...nel.org>
CC:	kernel list <linux-kernel@...r.kernel.org>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Subject: Re: [PATCH] perf: Fix parallel build

On 9/20/12 7:24 PM, Namhyung Kim wrote:
> Hi Eric,
> 
> On Thu, 20 Sep 2012 18:53:01 -0500, Eric Sandeen wrote:
>> 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 call in tools/perf/Makefile and running make -j4 on a
>> smaller box:
>>
>> 	sleep 10; $(QUIET_BISON)$(BISON) -v util/pmu.y -d -o $(OUTPUT)util/pmu-bison.c
>>
>> Adding the following dependency fixes it for me:
>>
>> Signed-off-by: Eric Sandeen <sandeen@...hat.com>
>> ---
>>
>> diff --git a/tools/perf/Makefile b/tools/perf/Makefile
>> index bad726a..6c389d9 100644
>> --- a/tools/perf/Makefile
>> +++ b/tools/perf/Makefile
>> @@ -219,7 +219,7 @@ $(OUTPUT)util/parse-events-flex.c: util/parse-events.l
>>  $(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
> 
> I guess the $(OUTPUT)util/parse-events-flex.c: line has the same
> problem.  Could you check and submit a patch for that too?
> 
> Thanks,
> Namhyung
> 

Whoops you are right, will resent V2 shortly, thanks.

-Eric
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