New in version 3.1.
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
option or via the
CMAKE_GENERATOR_PLATFORM 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 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:
For Visual Studio Generators with VS 2005 and above this specifies the target architecture.
Green Hills MULTIthis specifies the target architecture.
See native build system documentation for allowed platform names.