tetst

    long long target_mtime = file_mtime(target);

    for (const auto& p : prereqs) {

        // A phony prerequisite (e.g. Kbuild's FORCE) is always considered out

        // of date by GNU make, so any target that lists it is always rebuilt.

        // This is what drives if_changed and forces e.g. tools/objtool and

        // archive (built-in.a) regeneration even when the target file exists.

        if (mf_.phony_targets.count(p)) return true;

        if (file_exists(p) && file_mtime(p) > target_mtime) return true;

    }

    return false;