CMake: add WITH_UNITY_BUILD option to improve compile times
Unity builds are only used in the `bf_nodes_geometry` module for now. This module has been prepared to support unity builds already. Usually, there is a 2-4x speedup when building `bf_nodes_geometry` compared to without unity builds (e.g. 145s to 55s). For more information about how unity builds work and how they help with compile times, see D13341. Differential Revision: https://developer.blender.org/D13341
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@ -187,6 +187,13 @@ mark_as_advanced(CPACK_OVERRIDE_PACKAGENAME)
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mark_as_advanced(BUILDINFO_OVERRIDE_DATE)
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mark_as_advanced(BUILDINFO_OVERRIDE_TIME)
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if(${CMAKE_VERSION} VERSION_GREATER_EQUAL "3.16")
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option(WITH_UNITY_BUILD "Enable unity build for modules that support it to improve compile times" ON)
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mark_as_advanced(WITH_UNITY_BUILD)
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else()
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set(WITH_UNITY_BUILD OFF)
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endif()
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option(WITH_IK_ITASC "Enable ITASC IK solver (only disable for development & for incompatible C++ compilers)" ON)
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option(WITH_IK_SOLVER "Enable Legacy IK solver (only disable for development)" ON)
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option(WITH_FFTW3 "Enable FFTW3 support (Used for smoke, ocean sim, and audio effects)" ON)
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@ -265,3 +265,8 @@ if(WITH_OPENVDB)
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endif()
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blender_add_lib(bf_nodes_geometry "${SRC}" "${INC}" "${INC_SYS}" "${LIB}")
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if(WITH_UNITY_BUILD)
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set_target_properties(bf_nodes_geometry PROPERTIES UNITY_BUILD ON)
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set_target_properties(bf_nodes_geometry PROPERTIES UNITY_BUILD_BATCH_SIZE 10)
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endif()
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