使用mips-linux-gnu-工具链编译代码时，遇到错误：
undefined reference to `__ctype_b_loc' undefined reference to `__ctype_tolower_loc' undefined reference to `__assert_fail' undefined reference to `uselocale' undefined reference to `duplocale' undefined reference to `newlocale' undefined reference to `freelocale' undefined reference to `__xstat'都是编译开源库中出现的问题，一路追踪，发现编译时使用了-muclibc选项，所以使用的非glibc；
在编译时加上-Wno-unused-local-typedefs即可。
