Value for symbol visibility compile flags
The <LANG>_VISIBILITY_PRESET property determines the value passed in a visibility related compile option, such as -fvisibility= for <LANG>. This property affects compilation in sources of all types of targets (subject to policy CMP0063).
This property is initialized by the value of the CMAKE_<LANG>_VISIBILITY_PRESET variable if it is set when a target is created.
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https://cmake.org/cmake/help/v3.19/prop_tgt/LANG_VISIBILITY_PRESET.html