解决 error LNK2001: unresolved external symbol "public: static void __cdecl std::_String_base::_Xran(void)

VC工程用到了std:map，debug编译、使用正常，但是Release时老是出错

: error LNK2001: unresolved external symbol "public: static void __cdecl std::_String_base::_Xran(void)const " (?_Xran@_String_base@std@@QBEXXZ)
 : error LNK2001: unresolved external symbol "public: static void __cdecl std::_String_base::_Xlen(void)const " (?_Xlen@_String_base@std@@QBEXXZ)

添加libcpmt.lib到link->input中就OK了。

参考：http://social.msdn.microsoft.com/Forums/zh/Vsexpressvc/thread/fcda929b-dd8c-4f38-a201-38d02b027e01