[PATCH v2] perf target: Ignore return value of strerror_r() explicitly

[Namhyung Kim]

From: Namhyung Kim <namhyung.kim@xxxxxxx>

Since glibc 2.16 added warn_unused_result (wur) attribute
to the function, we should check it or ignore it explicitly.

Also resets @buf not to access to garbages for an invalid
(negative) @errnum.

Reported-by: Markus Trippelsdorf <markus@xxxxxxxxxxxxxxx>
Signed-off-by: Namhyung Kim <namhyung@xxxxxxxxxx>
---
 tools/perf/util/target.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/target.c b/tools/perf/util/target.c
index 1064d5b148ad..c3a38918e8b6 100644
--- a/tools/perf/util/target.c
+++ b/tools/perf/util/target.c
@@ -110,8 +110,11 @@ int perf_target__strerror(struct perf_target *target, int errnum,
 	int idx;
 	const char *msg;
 
+	memset(buf, 0, buflen);
+
 	if (errnum >= 0) {
-		strerror_r(errnum, buf, buflen);
+		/* make glibc (>= 2.16) happy */
+		(void)strerror_r(errnum, buf, buflen);
 		return 0;
 	}
 
-- 
1.7.10.2

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