misc: fix various warnings

src/http.cpp

@@ -567,6 +567,8 @@ Connection::async_connect(std::vector<asio::ip::tcp::endpoint>&& endpoints, Conn
     }
     auto& base = ssl_socket_? ssl_socket_->lowest_layer() : *socket_;
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wunused-variable"
     ConnectHandlerCb wcb = [&base, cb=std::move(cb)](const asio::error_code& ec, const asio::ip::tcp::endpoint& endpoint) {
         if (!ec) {
             auto socket = base.native_handle();
@@ -614,6 +616,8 @@ Connection::async_connect(std::vector<asio::ip::tcp::endpoint>&& endpoints, Conn
         if (cb)
             cb(ec, endpoint);
     };
+#pragma GCC diagnostic pop
+
     if (ssl_socket_)
         asio::async_connect(ssl_socket_->lowest_layer(), std::move(endpoints), wrapCallabck(std::move(wcb)));
     else

src/network_utils.cpp

@@ -148,6 +148,8 @@ UdpSocket::sendTo(const SockAddr& dest, const uint8_t* data, size_t size, bool r
 #ifdef MSG_CONFIRM
     if (replied)
         flags |= MSG_CONFIRM;
+#else
+    (void) replied;
 #endif
 #ifdef MSG_NOSIGNAL
     flags |= MSG_NOSIGNAL;

tests/dhtproxytester.cpp

@@ -309,13 +309,13 @@ DhtProxyTester::testShutdownStop()
     for (size_t i = 0; i < C; i++) {
         auto nodeTest = std::make_shared<dht::DhtRunner>();
         nodeTest->run(0, clientConfig);
-        nodeTest->put(key, dht::Value(mtu), [&](bool ok) {
+        nodeTest->put(key, dht::Value(mtu), [&](bool /*ok*/) {
             callback_count++;
         });
         nodeTest->get(key, [&](const std::vector<std::shared_ptr<dht::Value>>& vals){
             values.insert(values.end(), vals.begin(), vals.end());
             return true;
-        },[&](bool ok){
+        },[&](bool /*ok*/){
             callback_count++;
         });
         bool done = false;

tests/dhtrunnertester.cpp

@@ -94,7 +94,6 @@ void
 DhtRunnerTester::testListen() {
     std::mutex mutex;
     std::condition_variable cv;
-    std::atomic_uint valueCount(0);
     std::atomic_uint valueCounta(0);
     std::atomic_uint valueCountb(0);
     std::atomic_uint valueCountc(0);