New in version 3.3.
This property is implemented only when <LANG> is C or CXX.
Specify a semicolon-separated list containing a command line for the include-what-you-use tool. The Makefile Generators and the Ninja generator will run this tool along with the compiler and report a warning if the tool reports any problems.
This property is initialized by the value of the CMAKE_<LANG>_INCLUDE_WHAT_YOU_USE variable if it is set when a target is created.
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https://cmake.org/cmake/help/v3.19/prop_tgt/LANG_INCLUDE_WHAT_YOU_USE.html