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/CMake 3.19

PCH_WARN_INVALID

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 ON.

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https://cmake.org/cmake/help/v3.19/prop_tgt/PCH_WARN_INVALID.html