code: func (l LDFlags) String() string {
  	var o []string
  	keys := make([]string, 0, len(l))
  	for k := range l {
  		keys = append(keys, k)
  	}
  	sort.Strings(keys)
  	for _, k := range keys {
  		ss := l[k]
  		if len(ss) == 0 {
  			o = append(o, "-"+k)
  			continue
  		}
  		for _, s := range ss {
  			o = append(o, fmt.Sprintf(`-%s %s`, k, s))
  		}
  	}
  	return strings.Join(o, " ")
  }
docs: // String returns the ldflags as a string