linux-kernel - Re: [PATCH v2 03/12] perf tools: include _

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Date:	Tue, 11 Sep 2012 00:42:29 +0300
From:	Irina Tirdea <irina.tirdea@...il.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Pekka Enberg <penberg@...nel.org>, mingo@...hat.com,
	acme@...stprotocols.net, rostedt@...dmis.org, paulus@...ba.org,
	dsahern@...il.com, namhyung.kim@....com,
	linux-kernel@...r.kernel.org, Irina Tirdea <irina.tirdea@...el.com>
Subject: Re: [PATCH v2 03/12] perf tools: include __WORDSIZE definition

On Mon, Sep 10, 2012 at 5:44 PM, Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:
> On Sun, 2012-09-09 at 01:19 +0300, Irina Tirdea wrote:
>> >> +#ifndef __WORDSIZE
>> >> +#if defined(__x86_64__)
>> >> +# define __WORDSIZE 64
>> >> +#endif
>> >> +#if defined(__i386__) || defined(__arm__)
>> >> +# define __WORDSIZE 32
>> >> +#endif
>> >> +#endif
>> >
>> > Why not use "sizeof(unsigned long) * 8" ?
>>
>> I tried to do it this, but the compilation crashes because this value
>> is tested in an #if:
>>
>> target  C: libperf <= tools/perf/util/annotate.c
>> In file included from tools/perf/util/include/linux/bitmap.h:5:0,
>>                  from tools/perf/util/header.h:10,
>>                  from tools/perf/util/session.h:6,
>>                  from tools/perf/util/build-id.h:4,
>>                  from tools/perf/util/annotate.c:11:
>> tools/perf/util/include/linux/bitops.h: In function '__ffs':
>> tools/perf/util/include/linux/bitops.h:62:5: warning: "sizeof" is not
>> defined [-Wundef]
>> tools/perf/util/include/linux/bitops.h:62:5: error: missing binary
>> operator before token "("
>
> Use either: __SIZEOF_LONG__ (8) or __LP64__ (1)

Thanks! Using __SIZEOF_LONG__ works. I'll update the patch.

Thanks,
Irina
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