clangd is really good these days (clangd-9), I suggest you give it a try. It's incredibly easy to set up if your distribution packages it. I'm using it with Ema

clangd is really good these days (clangd-9), I suggest you give it a try. It's incredibly easy to set up if your distribution packages it. I'm using it with Emacs' lsp-mode, it's great.