linux-kernel - Re: [PATCH] basic perf support for sparc

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Date:	Tue, 4 Aug 2009 13:28:59 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Arnaldo Carvalho de Melo <acme@...hat.com>
Cc:	Kyle McMartin <kyle@...artin.ca>,
	Jens Axboe <jens.axboe@...cle.com>,
	Anton Blanchard <anton@...ba.org>, davem@...emloft.net,
	linux-kernel@...r.kernel.org, a.p.zijlstra@...llo.nl,
	fweisbec@...il.com, benh@...nel.crashing.org,
	penberg@...helsinki.fi, vegard.nossum@...il.com, paulus@...ba.org,
	williams@...hat.com
Subject: Re: [PATCH] basic perf support for sparc


Btw., how about the solution below? Will the libbfd system library 
version override this weak alias properly?

	Ingo

-------------->
>From 238762507bb41689df191160ada1986b012b57df Mon Sep 17 00:00:00 2001
From: Ingo Molnar <mingo@...e.hu>
Date: Tue, 4 Aug 2009 13:27:41 +0200
Subject: [PATCH] perf_counter tools: Provide default bfd_demangle() function in case it's not around

Provide weak alias (which does nothing) in case the system does not
offer one.

Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Mike Galbraith <efault@....de>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 tools/perf/util/symbol.c |   11 +++++++++++
 1 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index b4fe057..7bd5128 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -8,6 +8,17 @@
 #include <elf.h>
 #include <bfd.h>
 
+/*
+ * Weak wrapper in case a library version is not available:
+ */
+extern char * __attribute__((weak)) bfd_demangle (bfd *, const char *, int);
+
+char * __attribute__((weak))
+ bfd_demangle (bfd *bfd __used, const char *name __used, int flags __used)
+{
+	return NULL;
+}
+
 const char *sym_hist_filter;
 
 #ifndef DMGL_PARAMS
--
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