SKIP_UNITY_BUILD_INCLUSION

.. versionadded:: 4.4

Setting this property to true ensures the source files of the file set will be skipped by unity builds when its associated target has its :prop_tgt:UNITY_BUILD property set to true. The source files of the file set will instead be compiled on their own in the same way as it would with unity builds disabled.

This property helps with "ODR (One definition rule)" problems where combining a particular source file with others might lead to build errors or other unintended side effects.

Note that :ref:file sets <File Sets> of type HEADERS and CXX_MODULES as well as the sources which are scanned for C++ modules (see :manual:cmake-cxxmodules(7)) are not eligible for unity build inclusion and will automatically be excluded.