LunarVim/ftplugin/c.lua

local clangd_flags = {"--background-index"};

if O.lang.clang.cross_file_rename then
   table.insert(clangd_flags, "--cross-file-rename")
end

table.insert(clangd_flags, "--header-insertion=" .. O.lang.clang.header_insertion)

require'lspconfig'.clangd.setup {
    cmd = {DATA_PATH .. "/lspinstall/cpp/clangd/bin/clangd",  unpack(clangd_flags)},
    on_attach = require'lsp'.common_on_attach,
    handlers = {
        ["textDocument/publishDiagnostics"] = vim.lsp.with(vim.lsp.diagnostic.on_publish_diagnostics, {
            virtual_text = O.lang.clang.diagnostics.virtual_text,
            signs = O.lang.clang.diagnostics.signs,
            underline = O.lang.clang.diagnostics.underline,
            update_in_insert = true

        })
    }
}