By the looks of it setting the SOVERSION when generating a SHARED library creates the symbolic link, but it doesn't seem to use the -current_version or -compatibility_version flags when linking.
Those flags are set as variables CMAKE_C_OSX_CURRENT_VERSION_FLAG and CMAKE_C_OSX_COMPATIBILITY_VERSION_FLAG (and similar for other languages) but those don't seem to be used. Is that deliberate?
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