CXX_STANDARD_REQUIRED Boolean describing whether the value of CXX_STANDARD is a requirement. If this property is set to ON, then the value of the CXX_STANDARD target property is treated as a requirement. If this property is OFF or unset, the CXX_STANDARD target property is treated as optional and may “decay” to a previous standard if the requested is not available. For compilers that have no notion of a standard level, such as MSVC, this has no effect. See the cmake-compile-features(7) manual for information on compile features and a list of supported compilers. This property is initialized by the value of the CMAKE_CXX_STANDARD_REQUIRED variable if it is set when a target is created.

    
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