Merge pull request #3196 from Carbenium/clang-build-fix

Fix build under clang

cmake/compiler/gcc/settings.cmake

@@ -1,6 +1,7 @@
 target_compile_options(zm-warning-interface
   INTERFACE
     -Wall
+    -Wconditionally-supported
     -Wextra
     -Wformat-security
     -Wno-cast-function-type

src/zm_remote_camera_http.cpp

@@ -289,7 +289,7 @@ int RemoteCameraHttp::ReadData(Buffer &buffer, unsigned int bytes_expected) {
     total_bytes_to_read -= bytes_read;
   } while (total_bytes_to_read);
 
-  Debug(4, "buffer: %s", buffer);
+  Debug(4, "buffer size: %d", static_cast<int>(buffer));
 
   return total_bytes_read;
 }  // end readData