linux-kernel - perf probe: Build error with missing libraries

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Message-ID: <20140113180400.GD5318@ghostprotocols.net>
Date:	Mon, 13 Jan 2014 15:04:00 -0300
From:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	Jiri Olsa <jolsa@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: perf probe: Build error with missing libraries

On a Ubuntu system just installed (13.10, x86_64), I'm installing the
devel libs one by one to check if there are problems with the automatic
disabling of features that requires libraries not installed.

Stumbled at this:

  CC       /tmp/build/perf/util/probe-event.o
util/probe-event.c: In function ‘try_to_find_probe_trace_events’:
util/probe-event.c:753:46: error: unused parameter ‘target’
[-Werror=unused-parameter]
     int max_tevs __maybe_unused, const char *target)
                                              ^
util/probe-event.c: At top level:
util/probe-event.c:193:12: error: ‘get_text_start_address’ defined but
not used [-Werror=unused-function]
 static int get_text_start_address(const char *exec, unsigned long
*address)
            ^
cc1: all warnings being treated as errors
make[1]: *** [/tmp/build/perf/util/probe-event.o] Error 1
make[1]: *** Waiting for unfinished jobs....
make: *** [install] Error 2
make: Leaving directory `/home/acme/git/linux/tools/perf'
acme@...ntu13:~/git/linux$ 

Investigating...

- Arnaldo
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