xcode, llvm, brew, and I have
clang on my system but not
clangd ..., I googled around and only find how install
brew install clangd but not found clangd. I even tried to go through the docs of llvm and still could not find the answer...
Here is another related question you should see to set that up: https://stackoverflow.com/questions/59185976/how-to-install-clangd-on-mac