From a4eef8e20c41002accbfab281984ad169511a479 Mon Sep 17 00:00:00 2001
From: Jan Kratochvil <jan.kratochvil@redhat.com>
Date: Sun, 2 Apr 2017 22:39:23 +0200
Subject: [PATCH] Fix gcc -O -D_FORTIFY_SOURCE.

---
 tz.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tz.cpp b/tz.cpp
index e84f0fd..377968f 100644
--- a/tz.cpp
+++ b/tz.cpp
@@ -3134,7 +3134,8 @@ current_zone()
         {
             std::ostringstream os;
             char message[128];
-            (void)strerror_r(errno, message, 128);
+            if (strerror_r(errno, message, sizeof(message)) != 0)
+                message[0] = '\0';
             os << "realpath failure: errno = " << errno << "; " << message;
             throw std::runtime_error(os.str());
         }