New in version 3.17.
On AIX, CMake automatically exports all symbols from shared libraries, and from executables with the ENABLE_EXPORTS target property set. Explicitly disable this boolean property to suppress the behavior and export no symbols by default. In this case it is expected that the project will use other means to export some symbols.
This property is initialized by the value of the CMAKE_AIX_EXPORT_ALL_SYMBOLS variable if it is set when a target is created.
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https://cmake.org/cmake/help/v3.19/prop_tgt/AIX_EXPORT_ALL_SYMBOLS.html