Automatically wrap C/C++ function at compile-time with annotation

In my C/C++ code I want to annotate different functions and methods so that additional code gets added at compile-time (or link-time). The added wrapping code should be able to inspect context (function being called, thread information, etc.), read/write input variables and modify return values and output variables.

How can I do that with GCC and/or Clang?

Source: gcc

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