of preference, this may be done by:

#. Marking the object ``const`` (if possible)
#. Moving the object's definition to a source file
#. Making the object visible using ``__attribute((visibility("default")))``,
   ``__declspec(dllimport)``, or ``__declspec(dllexport)``.

When annotating an object with ``__declspec(dllimport)`` or ``__declspec(dllexport)``,
take care to ensure that the object is only exported from one dll, and is imported
everywhere else.

Note that for (2), all levels of a pointer variable must be constant;
``const int*`` will trigger the warning because the pointer itself is mutable.