coc-settings.json

{
    "suggest.timeout": 500,
    "suggest.triggerAfterInsertEnter": true,
    "suggest.minTriggerInputLength": 2,

    "codeLens.enable": false,
    "diagnostic.displayByAle": false,

    "coc.source.syntax.enable": true,
    "coc.source.word.enable": true,

    "yank.limit": 5,
    "yank.highlight.duration": 300,

    "suggest.languageSourcePriority": 4,
    "yank.priority": 6,
    "snippets.priority": 8,
    "coc.source.syntax.priority": 10,
    "coc.source.word.priority": 15,
    "coc.source.file.priority": 20,

    // The Language local to use when spell checking. "en" and "en-GB" are currently supported.
    "cSpell.language": "en",

    // Controls the number of suggestions shown.
    "cSpell.numSuggestions": 8,

    // The minimum length of a word before checking it against a dictionary.
    "cSpell.minWordLength": 4,

    // Enable / Disable the spell checker.
    "cSpell.enabled": true,

    // Display the spell checker status on the status bar.
    "cSpell.showStatus": true,

    // Enable / Disable compound words like 'errormessage'
    "cSpell.allowCompoundWords": false,

    // Set the delay before spell checking the document. Default is 50.
    "cSpell.spellCheckDelayMs": 50,

    "inlayHint.enable": false,
    "languageserver": {
        "clangd": {
            "command": "clangd",
            "rootPatterns": ["compile_flags.txt", "compile_commands.json", ".repo/", ".git/", ".hg/"],
            "filetypes": ["c", "cpp", "objc", "objcpp"],
            "args": [
                "--clang-tidy",
                "--all-scopes-completion",
                "--background-index",
                "--background-index-priority=normal",
                "--completion-style=detailed",
                "--fallback-style=llvm",
                "--function-arg-placeholders",
                "--header-insertion=never",
                "--pch-storage=memory",
                "--malloc-trim",
                "--limit-results=120",
                "--limit-references=120",
                "--hidden-features"
            ]
        }
     }
}