Re: [PATCH v2 03/12] perf tools: include __WORDSIZE definition

From: Irina Tirdea
Date: Sat Sep 08 2012 - 18:21:00 EST

>> +#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 "("

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