您正在使用clang，这是对该问题的更好解释 https://***.com/a/14594287/497756 ，这是经过改进的过程(尚未显示在rvm头上): https://***.com/a/14940278/497756

you are using clang here is better explanation of the problem https://***.com/a/14594287/497756 and here is improved process (not yet on rvm head): https://***.com/a/14940278/497756