# MSVC_RUNTIME_LIBRARY

Select the MSVC runtime library for use by compilers targeting the MSVC ABI.

The allowed values are:

`MultiThreaded`
  Compile with `-MT` or equivalent flag(s) to use a multi-threaded statically-linked runtime library.
`MultiThreadedDLL`
  Compile with `-MD` or equivalent flag(s) to use a multi-threaded dynamically-linked runtime library.
`MultiThreadedDebug`
  Compile with `-MTd` or equivalent flag(s) to use a multi-threaded statically-linked runtime library.
`MultiThreadedDebugDLL`
  Compile with `-MDd` or equivalent flag(s) to use a multi-threaded dynamically-linked runtime library.

The value is ignored on non-MSVC compilers but an unsupported value will be rejected as an error when using a compiler targeting the MSVC ABI.

The value may also be the empty string (`""`) in which case no runtime library selection flag will be added explicitly by CMake. Note that with Visual Studio Generators the native build system may choose to add its own default runtime library selection flag.

Use `generator expressions` to support per-configuration specification. For example, the code:

    add_executable(foo foo.c)
    set_property(TARGET foo PROPERTY
      MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>")

selects for the target `foo` a multi-threaded statically-linked runtime library with or without debug information depending on the configuration.

If this property is not set then CMake uses the default value `MultiThreaded$<$<CONFIG:Debug>:Debug>DLL` to select a MSVC runtime library.

Note

This property has effect only when policy `CMP0091` is set to `NEW` prior to the first `project()` or `enable_language()` command that enables a language using a compiler targeting the MSVC ABI.