linux-kernel - Re: [PATCH v2] perf: perl: force to use stdbool.

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Date:	Tue, 20 Jan 2015 10:07:13 +0800
From:	Wang Nan <wangnan0@...wei.com>
To:	Namhyung Kim <namhyung@...nel.org>
CC:	<jolsa@...hat.com>, <linux-kernel@...r.kernel.org>,
	<lizefan@...wei.com>, <acme@...nel.org>
Subject: Re: [PATCH v2] perf: perl: force to use stdbool.

On 2015/1/19 22:26, Namhyung Kim wrote:
> On Mon, Jan 19, 2015 at 08:43:17PM +0800, Wang Nan wrote:
>> When building perf for arm64 I hit a warning (and be treated as an
>> error) like below:
>>
>>  aarch64-oe-linux-gcc -o .../util/scripting-engines/trace-event-python.o -c -Wbad-function-cast \
>> 	 ... util/scripting-engines/trace-event-python.c
> 
> s/python/perl/g ?
> 

I forgot I was using parallel building and simply pasted the previous line of the
error message here. The failed file should be 'scripts/perl/Perf-Trace-Util/Context.c'.
I posted a v3 patch with improved commit message.

> 
>>
>>  In file included from .../usr/lib64/perl/5.14.3/CORE/perl.h:2464:0,
>>                   from Context.xs:23:
>>  /.../usr/lib64/perl/5.14.3/CORE/handy.h:108:0: error: "bool" redefined [-Werror]
>>   #  define bool char
>>   ^
>>  In file included from /.../usr/src/kernel/tools/include/linux/types.h:4:0,
>>                   from /.../usr/src/kernel/arch/arm64/include/uapi/asm/sigcontext.h:19,
>> 		  from /.../usr/include/bits/sigcontext.h:27,
>> 		  from /.../usr/include/signal.h:340,
>> 		  from /.../usr/include/sys/param.h:28,
>> 		  from /.../usr/lib64/perl/5.14.3/CORE/perl.h:678,
>> 		  from Context.xs:23:
>>   /.../usr/lib/aarch64-oe-linux/gcc/aarch64-oe-linux/4.9.2/include/stdbool.h:33:0: note: this is the location of the previous definition
>>     #define bool _Bool
>>
>> Looks like the failure is caused by arm64 uapi/asm/sigcontext.h, which
>> includes linux/types.h while other archs not.
>>
>> Current perl consider this problem:
>>
>> http://perl5.git.perl.org/perl.git/commit/bd31be4baa3ee68abdb92c0db3200efe0fad903b
>>
>> However there are users which use old version of perl.
>>
>> This patch includes stdbool.h before Context.xs and define HAS_BOOL to
>> prevent perl'e headers define its own 'bool'. Code is learn from perl's
>> git tree.
>>
>> Signed-off-by: Wang Nan <wangnan0@...wei.com>
> 
> Other than that, looks good to me.
> 
> Acked-by: Namhyung Kim <namhyung@...nel.org>
> 
> Thanks,
> Namhyung
> 
> 
>> ---
>>  tools/perf/scripts/perl/Perf-Trace-Util/Context.c | 5 ++++-
>>  1 file changed, 4 insertions(+), 1 deletion(-)
>>
>> diff --git a/tools/perf/scripts/perl/Perf-Trace-Util/Context.c b/tools/perf/scripts/perl/Perf-Trace-Util/Context.c
>> index 790ceba..28431d1 100644
>> --- a/tools/perf/scripts/perl/Perf-Trace-Util/Context.c
>> +++ b/tools/perf/scripts/perl/Perf-Trace-Util/Context.c
>> @@ -5,7 +5,10 @@
>>   *	ANY CHANGES MADE HERE WILL BE LOST! 
>>   *
>>   */
>> -
>> +#include <stdbool.h>
>> +#ifndef HAS_BOOL
>> +# define HAS_BOOL 1
>> +#endif
>>  #line 1 "Context.xs"
>>  /*
>>   * Context.xs.  XS interfaces for perf script.
>> -- 
>> 1.8.4
>>


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