Generator-specific target platform specification provided 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 platform name (e.g. via the
-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
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.
Platform specification is supported only on specific generators:
See native build system documentation for allowed platform names.
On Visual Studio Generators the selected platform name is provided in the
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