CMP0198

CMAKE_PARENT_LIST_FILE is not defined in CMakeLists.txt.

CMake 4.1 and below defined CMAKE_PARENT_LIST_FILE when processing a CMakeLists.txt even though there is no parent file. CMake 4.2 and above prefer to not define CMAKE_PARENT_LIST_FILE. This policy provides compatibility for projects that accidentally relied on the old behavior.

The OLD behavior for this policy is to set CMAKE_PARENT_LIST_FILE to CMAKE_CURRENT_LIST_FILE when processing a CMakeLists.txt. The NEW behavior for this policy is to not set CMAKE_PARENT_LIST_FILE.

This policy was introduced in CMake version 4.2. It may be set by cmake_policy() or cmake_minimum_required(). If it is not set, CMake does not warn, and uses OLD behavior.