New in version 3.16.
Is this source file skipped by PRECOMPILE_HEADERS feature.
This property helps with build problems that one would run into when using the PRECOMPILE_HEADERS feature.
One example would be the usage of Objective-C (*.m) files, and Objective-C++ (*.mm) files, which lead to compilation failure because they are treated (in case of Ninja / Makefile generator) as C, and CXX respectively. The precompile headers are not compatible between languages.
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https://cmake.org/cmake/help/v3.19/prop_sf/SKIP_PRECOMPILE_HEADERS.html