ABSTRACT

From Get docs
Cmake/docs/3.21/prop sf/abstract


ABSTRACT

Is this source file an abstract class.

A property on a source file that indicates if the source file represents a class that is abstract. This only makes sense for languages that have a notion of an abstract class and it is only used by some tools that wrap classes into other languages.

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https://cmake.org/cmake/help/v3.21/prop_sf/ABSTRACT.html