Unused variable warnings under NDEBUG

[iphydf]

A possible solution:

diff --git a/src/listener.cpp b/src/listener.cpp
index 199af10..d35b56a 100644
--- a/src/listener.cpp
+++ b/src/listener.cpp
@@ -32,7 +32,9 @@ SocketListener::SocketListener(NetworkInterface* iface

 #ifdef ZMQ
     zmq_broadcast = zmq_socket(zmq, ZMQ_PUB);
+#ifndef NDEBUG
     int rc =
+#endif
         zmq_bind(zmq_broadcast,
                  (std::string("ipc://") + unixSocket + "broadcast").c_str());
     assert(rc == 0);
@@ -80,7 +82,10 @@ void SocketListener::broadcast(const char* msg) {
     char* hack = new char[4];
     strcpy(hack, "all");
     hack[3] = 0;
-    int rc = zmq_msg_init_data(&header, hack, 3, NULL, NULL);
+#ifndef NDEBUG
+    int rc =
+#endif
+        zmq_msg_init_data(&header, hack, 3, NULL, NULL);
     assert(rc == 0);
     zmq_msg_send(&header, zmq_broadcast, ZMQ_SNDMORE);

@@ -88,7 +93,10 @@ void SocketListener::broadcast(const char* msg) {
     strncpy(copy, msg, strlen(msg));

     zmq_msg_t msg_out;
-    rc = zmq_msg_init_data(&msg_out, (void*) copy, strlen(msg), NULL, NULL);
+#ifndef NDEBUG
+    rc =
+#endif
+        zmq_msg_init_data(&msg_out, (void*) copy, strlen(msg), NULL, NULL);
     assert(rc == 0);
     zmq_msg_send(&msg_out, zmq_broadcast, 0);
 #endif
diff --git a/src/main.cpp b/src/main.cpp
index 2a8287a..49ede36 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -49,7 +49,10 @@ void saveState(Tox* tox) {
     tox_get_savedata(tox, savedata);
     int fd = open("savedata", O_TRUNC | O_WRONLY | O_CREAT, 0644);
     assert(fd);
-    ssize_t written = write(fd, savedata, size);
+#ifndef NDEBUG
+    ssize_t written =
+#endif
+        write(fd, savedata, size);
     assert(written > 0); // FIXME: check even if NDEBUG is disabled
     close(fd);
     delete[] savedata;