.config/nvim/coc-settings.json

 {
     "languageserver": {
-        "clangd": {
-            "command": "clangd",
-            "args": ["--background-index"],
-            "rootPatterns": ["compile_flags.txt", "compile_commands.json", ".git/", ".hg/"],
-            "filetypes": ["c", "cpp", "objc", "objcpp"]
-        },
         "ccls": {
             "command": "ccls",
             "filetypes": ["c", "cpp", "cuda", "objc", "objcpp"],
@@ -802,6 +796,7 @@
       "gfmul",
       "gpio",
       "gridlayout",
+      "gsettings",
       "gwstat",
       "hackmd",
       "hasharea",

.vimrc

@@ -1032,7 +1032,7 @@ nnoremap <silent> <leader>p  :<C-u>CocListResume<CR>
 
 
 " Rust Coc needs
-" :CocInstall coc-rust-analyzer coc-spell-checker coc-cspell-dicts coc-json coc-markdownlint coc-yaml coc-pyright coc-vimtex
+" :CocInstall coc-rust-analyzer coc-spell-checker coc-cspell-dicts coc-json coc-markdownlint coc-yaml coc-pyright coc-vimtex coc-clangd
 "
 " For text linting to work via coc-diagnostic, install
 " yay -S languagetool alex proselint write-good
@@ -1047,6 +1047,7 @@ let g:coc_global_extensions = [
             \'coc-spell-checker',
             \'coc-ltex',
             \'coc-cspell-dicts',
+            \'coc-clangd',
             \'coc-vimtex']
 
 " Coc END