project(unitybuild_anon_ns_group_mode CXX) include(${CMAKE_CURRENT_SOURCE_DIR}/unitybuild_anon_ns_test_files.cmake) write_unity_build_anon_ns_test_files(srcs) add_library(tgt SHARED ${srcs}) set_target_properties(tgt PROPERTIES UNITY_BUILD ON UNITY_BUILD_MODE GROUP) set_target_properties(tgt PROPERTIES UNITY_BUILD_UNIQUE_ID MY_ANON_ID) set_source_files_properties(s1.cpp s2.cpp s5.cpp s7.cpp s8.cpp PROPERTIES UNITY_GROUP "a" ) set_source_files_properties(s3.cpp s4.cpp s6.cpp PROPERTIES UNITY_GROUP "b" )