clion can not find declaration when using with docker

I follow the guid in https://blog.jetbrains.com/clion/2018/09/initial-remote-dev-support-clion/ and I can debug with docker in clion.

However Clion IDE can not provide any functionality to help me with coding, even do not notify an error when I miss the semicolon at the end of my code.

Now, it's easy debug but difficult to code.

How can I solve this problem