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Native build system toolset specification provided by user.
Some CMake generators support a toolset specification to tell the
native build system how to choose a compiler. If the user specifies
a toolset (e.g. via the :manual:`cmake(1)` ``-T`` option or via
the :envvar:`CMAKE_GENERATOR_TOOLSET` environment variable) the value
will be available in this variable.
The value of this variable should never be modified by project code.
A toolchain file specified by the :variable:`CMAKE_TOOLCHAIN_FILE`
variable may initialize ``CMAKE_GENERATOR_TOOLSET``. Once a given
build tree has been initialized with a particular value for this
variable, changing the value has undefined behavior.
Toolset specification is supported only on specific generators:
* :ref:`Visual Studio Generators` for VS 2010 and above
* The :generator:`Xcode` generator for Xcode 3.0 and above
* The :generator:`Green Hills MULTI` generator
See native build system documentation for allowed toolset names.
Visual Studio Toolset Selection
The :ref:`Visual Studio Generators` support toolset specification
using one of these forms:
* ``toolset``
* ``toolset[,key=value]*``
* ``key=value[,key=value]*``
The ``toolset`` specifies the toolset name. The selected toolset name
is provided in the :variable:`CMAKE_VS_PLATFORM_TOOLSET` variable.
The ``key=value`` pairs form a comma-separated list of options to
specify generator-specific details of the toolset selection.
Supported pairs are:
Specify the CUDA toolkit version to use or the path to a
standalone CUDA toolkit directory. Supported by VS 2010
and above. The version can only be used with the CUDA
toolkit VS integration globally installed.
See the :variable:`CMAKE_VS_PLATFORM_TOOLSET_CUDA` and
Specify the host tools architecture as ``x64`` or ``x86``.
Supported by VS 2013 and above.
Specify the toolset version to use. Supported by VS 2017
and above with the specified toolset installed.
See the :variable:`CMAKE_VS_PLATFORM_TOOLSET_VERSION` variable.