Background of the Microsoft C Run-time Libraries

The Microsoft C Run-time Libraries

纯C运行库：

 

Pure C run-time library	Characteristics	Compiler Option	Preprocessor directives
LIBC.LIB	Single-threaded, static link.	/ML	-
LIBCMT.LIB	Multithreaded, static link.	/MT	_MT
MSVCRT.LIB	Multithreaded, dynamic link (import library for MSVCR70.DLL).  Be aware that if you use the Standard C++ Library, your program will need MSVCP70.DLL to run.	/MD	_MT, _DLL
LIBCD.LIB	Single-threaded, static link (debug).	/MLd	_DEBUG
LIBCMTD.LIB	Multithreaded, static link (debug).	/MTd	_DEBUG, _MT
MSVCRTD.LIB	Multithreaded, dynamic link (import library for MSVCR70D.DLL) (debug)	/MDd	_DEBUG, _MT, _DLL

The Standard C++ Library（标准C++运行库）

VC中有2中标准C++库

1）old iostream library

Old iostream library	Characteristics	Compiler Option	Preprocessor directives
LIBCI.LIB	Single-threaded, static link.	/ML	-
LIBCIMT.LIB	Multithreaded, static link.	/MT	_MT
MSVCIRT.LIB	Multithreaded, dynamic link (import library for MSVCI70.DLL).	/MD	_MT, _DLL
LIBCID.LIB	Single threaded, static link.	/MLd	_DEBUG
LIBCIMTD.LIB	Multithreaded, static link.	/MTd	_DEBUG, _MT
MSVCIRTD.LIB	Multithreaded, dynamic link (import library for MSVCI70D.DLL).	/MDd	_DEBUG, _MT, _DLL

2） new iostream library

Standard C++ Library	Characteristics	Compiler Option	Preprocessor directives
LIBCP.LIB	Single-threaded, static link	/ML	-
LIBCPMT.LIB	Multithreaded, static link	/MT	_MT
MSVCPRT.LIB	Multithreaded, dynamic link (import library for MSVCP70.dll)	/MD	_MT, _DLL
LIBCPD.LIB	Single-threaded, static link	/MLd	_DEBUG
LIBCPMTD.LIB	Multithreaded, static link	/MTd	_DEBUG, _MT
MSVCPRTD.LIB	Multithreaded, dynamic link (import library for MSVCP70.DLL)	/MDd	_DEBUG, _MT, _DLL

两种库不兼容，只有一个可以链接到我们的工程上面去。：）

如果你使用标准C++头（e.g. #include<iostream>）,VC编译器会自动选择标准C++库；而使用老式的头（e.g. #include<iostream.h>），VC编译器会自动选择 旧的库(old iostream library)。