cmake / 3.20 / variable / cmake_unity_build_unique_id.html /

CMAKE_UNITY_BUILD_UNIQUE_ID

New in version 3.20.

This variable is used to initialize the UNITY_BUILD_UNIQUE_ID property of targets when they are created. It specifies the name of the unique identifier generated per file in a unity build.

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https://cmake.org/cmake/help/v3.20/variable/CMAKE_UNITY_BUILD_UNIQUE_ID.html