linux-kernel - Re: [PATCH] perf symbols: Define STT_GNU

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Date:	Tue, 10 Feb 2015 23:24:44 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Vinson Lee <vlee@...pensource.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Jiri Olsa <jolsa@...hat.com>, Waiman Long <Waiman.Long@...com>,
	Stephane Eranian <eranian@...gle.com>,
	Anton Blanchard <anton@...ba.org>,
	Avi Kivity <avi@...udius-systems.com>,
	linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
	Vinson Lee <vlee@...tter.com>
Subject: Re: [PATCH] perf symbols: Define STT_GNU_IFUNC for glibc 2.9 and
 older.

Hi Vinson,

On Mon, Feb 09, 2015 at 04:29:37PM -0800, Vinson Lee wrote:
> From: Vinson Lee <vlee@...tter.com>
> 
> The token STT_GNU_IFUNC is not available with glibc 2.9 and older.
> Define this token if it is not already defined.
> 
> This patch fixes this build errors with older versions of glibc.
> 
>   CC       util/symbol-elf.o
> util/symbol-elf.c: In function ‘elf_sym__is_function’:
> util/symbol-elf.c:75: error: ‘STT_GNU_IFUNC’ undeclared (first use in this function)
> util/symbol-elf.c:75: error: (Each undeclared identifier is reported only once
> util/symbol-elf.c:75: error: for each function it appears in.)
> make: *** [util/symbol-elf.o] Error 1
> 
> Cc: stable@...r.kernel.org # 3.17+
> Signed-off-by: Vinson Lee <vlee@...tter.com>

Acked-by: Namhyung Kim <namhyung@...nel.org>

Thanks,
Namhyung


> ---
>  tools/perf/util/symbol-elf.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/tools/perf/util/symbol-elf.c b/tools/perf/util/symbol-elf.c
> index 06fcd1b..eafee11 100644
> --- a/tools/perf/util/symbol-elf.c
> +++ b/tools/perf/util/symbol-elf.c
> @@ -69,6 +69,10 @@ static inline uint8_t elf_sym__type(const GElf_Sym *sym)
>  	return GELF_ST_TYPE(sym->st_info);
>  }
>  
> +#ifndef STT_GNU_IFUNC
> +#define STT_GNU_IFUNC 10
> +#endif
> +
>  static inline int elf_sym__is_function(const GElf_Sym *sym)
>  {
>  	return (elf_sym__type(sym) == STT_FUNC ||
> -- 
> 1.8.2.1
> 
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