| CMAKE_HOST_SYSTEM | |
| ----------------- | |
| Composit Name of OS CMake is being run on. | |
| This variable is the composite of :variable:`CMAKE_HOST_SYSTEM_NAME` and | |
| :variable:`CMAKE_HOST_SYSTEM_VERSION`, e.g. | |
| ``${CMAKE_HOST_SYSTEM_NAME}-${CMAKE_HOST_SYSTEM_VERSION}``. If | |
| :variable:`CMAKE_HOST_SYSTEM_VERSION` is not set, then this variable is | |
| the same as :variable:`CMAKE_HOST_SYSTEM_NAME`. |