how to resolve __cxa_throw multi-definition

I defined my own specific `__cxa_throw` to overwrite the original function in the system.
But when I linked libfolly.a, it output errors for multi-definition of `__cxa_throw`.
For there is `__cxa_throw` defined in `folly/experimental/exception_tracer/ExceptionTracerLib.cpp`.
How can I resolved this problem?

Read folly/experimental/exception_tracer/ExceptionTracerLib.cpp to confirm the library's definition, then inspect the link step that includes libfolly.a and the user's own __cxa_throw definition. Determine how the project expects this symbol conflict to be handled and verify that the resulting link no longer reports multiple definitions.

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