New in version 3.18.
When this property is set to true, the precompile header compiler options will contain a compiler flag which should warn about invalid precompiled headers e.g.
-Winvalid-pch for GNU compiler.
This property is initialized by the value of the
CMAKE_PCH_WARN_INVALID variable if it is set when a target is created. If that variable is not set, the property defaults to
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