CMake/Help/variable/CMAKE_GENERATOR_PLATFORM.rst

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CMAKE_GENERATOR_PLATFORM
------------------------
Generator-specific target platform name specified by user.
Some CMake generators support a target platform name to be given
to the native build system to choose a compiler toolchain.
If the user specifies a toolset name (e.g. via the cmake -A option)
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_PLATFORM``. Once a given
build tree has been initialized with a particular value for this
variable, changing the value has undefined behavior.