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

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Message-ID: <20150119142656.GB4624@danjae>
Date:	Mon, 19 Jan 2015 23:26:56 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Wang Nan <wangnan0@...wei.com>
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 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 ?


> 
>  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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