test

    std::vector<std::string> results;

    for (const auto& pat : patterns) {

        // Fast path: a literal pattern (no glob metacharacters) does not need a

        // directory scan. GNU make's $(wildcard foo) just checks if foo exists.

        // This matters for performance: Kbuild .cmd files contain dozens of

        // $(wildcard include/config/FOO) per object, and include/config can hold

        // thousands of entries. Scanning the whole directory for every literal

        // lookup is catastrophically slow, so stat the path directly instead.

        if (pat.find_first_of("*?[") == std::string::npos) {

            std::error_code ec;

            if (fs::exists(pat, ec)) {

                results.push_back(pat);

            }

            continue;

        }

        fs::path p(pat);

        fs::path dir = p.parent_path();

        std::string name_pat = p.filename().string();