Warning fix on gcc 9.3.0 with logging disabled

Author: King_DuckZ

include/restc-cpp/restc-cpp.h

@@ -145,7 +145,7 @@ class Request {
     class Properties {
     public:
         using ptr_t = std::shared_ptr<Properties>;
-        using redirect_fn_t = std::function<void (int code, std::string& url, 
+        using redirect_fn_t = std::function<void (int code, std::string& url,
                                                   const Reply& reply)>;
 
         int maxRedirects = 3;
@@ -382,7 +382,7 @@ class RestClient {
             done_handler.reset();
         });
 
-        return move(future);
+        return future;
     }
 
 

src/ChunkedReaderImpl.cpp

@@ -46,8 +46,15 @@ class ChunkedReaderImpl : public DataReader {
     }
 
     void Log(const boost::asio::const_buffers_1 buffers, const char *tag) {
+#if __cplusplus >= 201703L
+        [[maybe_unused]]
+#endif
         const auto buf_len = boost::asio::buffer_size(*buffers.begin());
 
+#if __cplusplus < 201703L
+        static_cast<void>(buf_len);
+#endif
+
         // At the time of the implementation, there are never multiple buffers.
         RESTC_CPP_LOG_TRACE_(tag << ' ' << "# " << buf_len
             << " bytes: "

src/IoWriterImpl.cpp

@@ -33,9 +33,7 @@ class IoWriterImpl : public DataWriter {
             connection_->GetSocket().AsyncWrite(buffers, ctx_.GetYield());
         }
 
-        const auto bytes = boost::asio::buffer_size(buffers);
-
-        RESTC_CPP_LOG_TRACE_("Wrote #" << bytes
+        RESTC_CPP_LOG_TRACE_("Wrote #" << boost::asio::buffer_size(buffers)
             << " bytes to " << connection_);
     }
 
@@ -49,9 +47,7 @@ class IoWriterImpl : public DataWriter {
             connection_->GetSocket().AsyncWrite(buffers, ctx_.GetYield());
         }
 
-        const auto bytes = boost::asio::buffer_size(buffers);
-
-        RESTC_CPP_LOG_TRACE_("Wrote #" << bytes
+        RESTC_CPP_LOG_TRACE_("Wrote #" << boost::asio::buffer_size(buffers)
             << " bytes to " << connection_);
     }