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CMAKE_GENERATOR_TOOLSET
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-----------------------
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Native build system toolset specification provided by user.
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Some CMake generators support a toolset specification to tell the
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native build system how to choose a compiler. If the user specifies
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a toolset (e.g. via the :manual:`cmake(1)` ``-T`` option or via
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the :envvar:`CMAKE_GENERATOR_TOOLSET` environment variable) the value
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will be available in this variable.
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The value of this variable should never be modified by project code.
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A toolchain file specified by the :variable:`CMAKE_TOOLCHAIN_FILE`
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variable may initialize ``CMAKE_GENERATOR_TOOLSET``. Once a given
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build tree has been initialized with a particular value for this
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variable, changing the value has undefined behavior.
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Toolset specification is supported only on specific generators:
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* :ref:`Visual Studio Generators` for VS 2010 and above
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* The :generator:`Xcode` generator for Xcode 3.0 and above
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* The :generator:`Green Hills MULTI` generator
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See native build system documentation for allowed toolset names.
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Visual Studio Toolset Selection
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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The :ref:`Visual Studio Generators` support toolset specification
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using one of these forms:
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* ``toolset``
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* ``toolset[,key=value]*``
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* ``key=value[,key=value]*``
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The ``toolset`` specifies the toolset name. The selected toolset name
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is provided in the :variable:`CMAKE_VS_PLATFORM_TOOLSET` variable.
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The ``key=value`` pairs form a comma-separated list of options to
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specify generator-specific details of the toolset selection.
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Supported pairs are:
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``cuda=<version>|<path>``
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Specify the CUDA toolkit version to use or the path to a
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standalone CUDA toolkit directory. Supported by VS 2010
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and above. The version can only be used with the CUDA
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toolkit VS integration globally installed.
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See the :variable:`CMAKE_VS_PLATFORM_TOOLSET_CUDA` and
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:variable:`CMAKE_VS_PLATFORM_TOOLSET_CUDA_CUSTOM_DIR` variables.
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``host=<arch>``
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Specify the host tools architecture as ``x64`` or ``x86``.
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Supported by VS 2013 and above.
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See the :variable:`CMAKE_VS_PLATFORM_TOOLSET_HOST_ARCHITECTURE`
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variable.
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``version=<version>``
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Specify the toolset version to use. Supported by VS 2017
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and above with the specified toolset installed.
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See the :variable:`CMAKE_VS_PLATFORM_TOOLSET_VERSION` variable.
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``VCTargetsPath=<path>``
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Specify an alternative ``VCTargetsPath`` value for Visual Studio
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project files. This allows use of VS platform extension configuration
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files (``.props`` and ``.targets``) that are not installed with VS.
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