How to build a dynamic library in which a global object defined in its caller is referenced

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Dear g++ Users,

I have a question on dynamic library:

in the dynamic library, I want to reference a global object which is
defined in its caller, how can I achieve that? What link options I
should use? If you can post some code example, it will be very
helpful. Thanks in advance!

// libMy.so
myMap["key"]="hello world"; // myMap is defined in the caller
...

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