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Indicates whether a multithreaded module is a DLL and specifies retail or debug versions of the run-time library.
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Indicates whether a multithreaded module is a DLL and specifies retail or debug versions of the runtime library.
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## Syntax
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@@ -22,27 +21,25 @@ Indicates whether a multithreaded module is a DLL and specifies retail or debug
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|Option|Description|
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|------------|-----------------|
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|**/MD**|Causes the application to use the multithread-specific and DLL-specific version of the run-time library. Defines `_MT` and `_DLL` and causes the compiler to place the library name MSVCRT.lib into the .obj file.|
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|**/MDd**|Defines `_DEBUG`, `_MT`, and `_DLL` and causes the application to use the debug multithread-specific and DLL-specific version of the run-time library. It also causes the compiler to place the library name MSVCRTD.lib into the .obj file.|
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|**/MT**|Causes the application to use the multithread, static version of the run-time library. Defines `_MT` and causes the compiler to place the library name LIBCMT.lib into the .obj file so that the linker will use LIBCMT.lib to resolve external symbols.|
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|**/MTd**|Defines `_DEBUG` and `_MT`. This option also causes the compiler to place the library name LIBCMTD.lib into the .obj file so that the linker will use LIBCMTD.lib to resolve external symbols.|
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|**/LD**|Creates a DLL.<br /><br /> Passes the **/DLL** option to the linker. The linker looks for, but does not require, a `DllMain` function. If you do not write a `DllMain` function, the linker inserts a `DllMain` function that returns TRUE.<br /><br /> Links the DLL startup code.<br /><br /> Creates an import library (.lib), if an export (.exp) file is not specified on the command line. You link the import library to applications that call your DLL.<br /><br /> Interprets [/Fe (Name EXE File)](fe-name-exe-file.md) as naming a DLL rather than an .exe file. By default, the program name becomes *basename*.dll instead of *basename*.exe.<br /><br /> Implies **/MT** unless you explicitly specify **/MD**.|
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|**/LDd**|Creates a debug DLL. Defines `_MT` and `_DEBUG`.|
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|**/MD**|Link with the multithread-specific and DLL-specific version of the runtime library. Defines `_MT` and `_DLL`. The linker uses the `MSVCRT.lib` import library to resolve runtime symbols.|
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|**/MDd**|Link with the debug multithread-specific and DLL-specific version of the runtime library. Defines `_DEBUG`, `_MT`, and `_DLL`. The linker uses the `MSVCRTD.lib` import library to resolve runtime symbols.|
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|**/MT**| Link with the multithread, static version of the runtime library. Defines `_MT`. The linker uses `LIBCMT.lib` to resolve runtime symbols.|
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|**/MTd**| Link with the debug multithread, static version of the runtime library. Defines `_DEBUG` and `_MT`. The linker uses `LIBCMTD.lib` to resolve runtime symbols.|
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|**/LD**|Create a DLL.<br /><br /> Passes the **/DLL** option to the linker. The linker looks for, but does not require, a `DllMain` function. If you don't write a `DllMain` function, the linker inserts a `DllMain` function that returns TRUE.<br /><br /> Links the DLL startup code.<br /><br /> Creates an import library (`.lib`), if an export (`.exp`) file is not specified on the command line. You link the import library to applications that call your DLL.<br /><br /> Interprets [/Fe (Name EXE File)](fe-name-exe-file.md) as naming a DLL rather than an `.exe` file. By default, the program name becomes *basename*.dll instead of *basename*.exe.<br /><br /> Implies **/MT** unless you explicitly specify **/MD**.|
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|**/LDd**|Create a debug DLL. Defines `_MT` and `_DEBUG`.|
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For more information about C run-time libraries and which libraries are used when you compile with [/clr (Common Language Runtime Compilation)](clr-common-language-runtime-compilation.md), see [CRT Library Features](../../c-runtime-library/crt-library-features.md).
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For more information about C runtime libraries and which libraries are used when you compile with [/clr (Common Language Runtime Compilation)](clr-common-language-runtime-compilation.md), see [CRT Library Features](../../c-runtime-library/crt-library-features.md).
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All modules passed to a given invocation of the linker must have been compiled with the same run-time library compiler option (**/MD**, **/MT**, **/LD**).
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All modules passed to a given invocation of the linker must have been compiled with the same runtime library compiler option (**/MD**, **/MT**, **/LD**).
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For more information about how to use the debug versions of the run-time libraries, see [C Run-Time Library Reference](../../c-runtime-library/c-run-time-library-reference.md).
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For more information about how to use the debug versions of the runtime libraries, see [C runtime Library Reference](../../c-runtime-library/c-runtime-library-reference.md).
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For more about DLLs, see [Create C/C++ DLLs in Visual Studio](../dlls-in-visual-cpp.md).
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### To set this compiler option in the Visual Studio development environment
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1. Open the project's **Property Pages** dialog box. For details, see [Set C++ compiler and build properties in Visual Studio](../working-with-project-properties.md).
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