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MACHO_COMPATIBILITY_VERSION --------------------------- What compatibility version number is this target for Mach-O binaries. For shared libraries on Mach-O systems (e.g. macOS, iOS) the ``MACHO_COMPATIBILITY_VERSION`` property corresponds to the *compatibility version* and :prop_tgt:`MACHO_CURRENT_VERSION` corresponds to the *current version*. These are both embedded in the shared library binary and can be checked with the ``otool -L <binary>`` command. It should be noted that the :prop_tgt:`MACHO_CURRENT_VERSION` and ``MACHO_COMPATIBILITY_VERSION`` properties do not affect the file names or version-related symlinks that CMake generates for the library. The :prop_tgt:`VERSION` and :prop_tgt:`SOVERSION` target properties still control the file and symlink names. The ``install_name`` is also still controlled by :prop_tgt:`SOVERSION`. When :prop_tgt:`MACHO_CURRENT_VERSION` and ``MACHO_COMPATIBILITY_VERSION`` are not given, :prop_tgt:`VERSION` and :prop_tgt:`SOVERSION` are used for the version details to be embedded in the binaries respectively. The :prop_tgt:`MACHO_CURRENT_VERSION` and ``MACHO_COMPATIBILITY_VERSION`` properties only need to be given if the project needs to decouple the file and symlink naming from the version details embedded in the binaries (e.g. to match libtool conventions).