TYPE

Widget type for entry in GUIs.

Cache entry values are always strings, but CMake GUIs present widgets to help users set values. The GUIs use this property as a hint to determine the widget type. Valid TYPE values are:

BOOL          = Boolean ON/OFF value.
PATH          = Path to a directory.
FILEPATH      = Path to a file.
STRING        = Generic string value.
INTERNAL      = Do not present in GUI at all.
STATIC        = Value managed by CMake, do not change.
UNINITIALIZED = Type not yet specified.

Generally the TYPE of a cache entry should be set by the command which creates it ( set(), option(), find_library(), etc.).

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https://cmake.org/cmake/help/v3.17/prop_cache/TYPE.html