linux-kernel - Re: [PATCH] perf probe: Fix build failure

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Message-ID: <4B4EBA20.1000800@cn.fujitsu.com>
Date:	Thu, 14 Jan 2010 14:30:56 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Masami Hiramatsu <mhiramat@...hat.com>
CC:	Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] perf probe: Fix build failure

>>>> builtin-probe.c:121: error: 'opt_show_lines' defined but not used
>>> Please add some comment for explanation, like:
>>>
>>> This build error occurs when compiling perf-tools without dwarf
>>> support (no libdwarf).
>>>
>> But as simple as this patch, the code itself has explained
>> the cause of this compile error.
> 
> If someone looks git-log afterwords, below message seems too
> short.
> ---
> perf probe: Fix build failure
> 
> builtin-probe.c:121: error: 'opt_show_lines' defined but not used
> ---
> Especially, if there is libdwarf, we will not see above error. So
> IMHO, at least we'd better add a comment about how the error occurs.
> 

Fair enough, here's the updated patch, and I guess I can
add you acked-by.

=============

From: Li Zefan <lizf@...fujitsu.com>
Subject: [PATCH] perf probe: Fix build failure

When compiling perf-tools without dwarf support, I ran into this:

builtin-probe.c:121: error: 'opt_show_lines' defined but not used

Signed-off-by: Li Zefan <lizf@...fujitsu.com>
Acked-by: Masami Hiramatsu <mhiramat@...hat.com>
---
 tools/perf/builtin-probe.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
index 1d3a99e..9be8063 100644
--- a/tools/perf/builtin-probe.c
+++ b/tools/perf/builtin-probe.c
@@ -118,6 +118,7 @@ static int opt_del_probe_event(const struct option *opt __used,
 	return 0;
 }
 
+#ifndef NO_LIBDWARF
 static int opt_show_lines(const struct option *opt __used,
 			  const char *str, int unset __used)
 {
@@ -127,6 +128,8 @@ static int opt_show_lines(const struct option *opt __used,
 	session.show_lines = true;
 	return 0;
 }
+#endif
+
 /* Currently just checking function name from symbol map */
 static void evaluate_probe_point(struct probe_point *pp)
 {
-- 
1.6.3

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