linux-kernel - Re: [PATCH 9/9] perf tools: Remove auto-generated bison/flex files

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Date:	Fri, 30 Mar 2012 10:09:14 -0700
From:	David Daney <ddaney.cavm@...il.com>
To:	Namhyung Kim <namhyung@...il.com>, Ingo Molnar <mingo@...nel.org>
CC:	Arnaldo Carvalho de Melo <acme@...radead.org>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Jiri Olsa <jolsa@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [PATCH 9/9] perf tools: Remove auto-generated bison/flex files

On 03/30/2012 09:43 AM, Namhyung Kim wrote:
> Hi,
>
> Arnaldo Carvalho de Melo<acme@...radead.org>  wrote:
>> From: Ingo Molnar<mingo@...nel.org>
>>
>> These should not be in the Git history - they are auto-generated.
>>
>> Extend the Makefile rules of the parser files to include the generation
>> run.
>>
>> Signed-off-by: Ingo Molnar<mingo@...e.hu>
[...]
>>
>> +FLEX = $(CROSS_COMPILE)flex
>> +BISON= $(CROSS_COMPILE)bison
>
> Just out of curiousity, is this $(CROSS_COMPILE) prefix really needed
> for flex/bison?
>

I think not.  Actually, I think it is actively incorrect.

I have done quite a bit of cross building of things requiring either 
bison or flex, and have never encountered  $(CROSS_COMPILE)bison, so I 
would think that it is unlikely that many people have one.  On the other 
hand the native tools work fine.

David Daney



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