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C run-time debug Libraries The following table lists the DEBUG Versions of the C run-time library files, along with their associated compiler options and environment variables. for a list of the release versions of these libraries, see C run-time libraries. Prior to Visual C ++ 4.2, the C run-time libraries contained the iostream library functions. in Visual C ++ 4.2, the old iostream library functions were removed from libcd. lib, libcmtd. lib, and msvcrtd. lib. this change was made because the standard C ++ library was added to Visual C ++, and it contains a new set of iostream libraries. Two sets of iostream functions are now supported in Visual C ++. the old iostream functions now exist in their own libraries: libcid. lib, libcimtd. lib, and msvcirtd. lib. the new iostream functions, as well as other new functions, exist in the Standard C ++ libraries: libcpd. lib, libcpmtd. lib, and msvcprtd. lib. The standard C ++ Library and the old iostream library are incompatible and only one of them can be linked with your project. see the Standard C ++ library overview and make the old iostream library the default for details. When you build a debug version of your project, one of the basic C run-time debug libraries (libcd. lib, libcmtd. lib, and msvcrtd. lib) is linked by default, depending on the compiler option you choose (single-threaded, multithreaded, or DLL ). depending on the headers you use in your code, a debug library from the Standard C ++ libraries or one from the old iostream libraries may also be linked. If you include a standard C ++ library header in your code, a standard C ++ library will be linked in automatically by Visual C ++ at compile time. For example: #include <ios> If you include an old iostream library header, an old iostream library will be linked in automatically by Visual C ++ at compile time. For example: #include <ios.h> Note that headers from the Standard C ++ Library and the old iostream library cannot be mixed. Headers determine whether a standard C ++ library, an old iostream library, or neither will be linked. compiler Options determine which of the libraries to be linked is the default (single-threaded, multithreaded, or DLL ). when a specific library compiler option is defined, that library is considered to be the default and its environment variables are automatically defined. C run-time debug Library (without iostream) Characteristics Option Defined Libcd. Lib Single-threaded, static Link /MLD _ Debug Libcmtd. Lib Multithreaded, static Link /MTD _ Debug,_ Mt Msvcrtd. Lib Multithreaded, dynamic link (Import library for msvcrtd. dll) 1 /MDD _ Debug,_ Mt,_ DLL 1 in place of the "X" in the DLL name, substitute the major version numeral of Visual C ++ that you are using. for example, if you are using Visual C ++ version 4, then the library name wocould be msvcr40d. DLL. Standard C ++ debug Library Characteristics Option Defined Libcpd. Lib Single-threaded, static Link /MLD _ Debug Libcpmtd. Lib Multithreaded, static Link /MTD _ Debug,_ Mt Msvcprtd. Lib Multithreaded, Dynamic Link (import library for msvcrtd. dll) /MDD _ Debug,_ Mt,_ DLL Iostream debug Library Characteristics Option Defined Libcid. Lib Single threaded, static Link /MLD _ Debug Libcimtd. Lib Multithreaded, static Link /MTD _ Debug,_ Mt Msvcirtd. Lib Multithreaded, Dynamic Link (import library for msvcirtd. dll) /MDD _ Debug,_ Mt,_ DLL The DEBUG Versions of the library functions differ from the release versions mainly in that debug information was provided ded when they were compiled (using the/z7 or/Zi compiler option), optimization was turned off, and source code is available. A few of the debug library functions also contain asserts that verify parameter validity. Using one of these debug libraries is as simple as linking it to your application with the/debug: Full linker option set. You can then step directly into almost any run-time function call.

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