Prototype for functions that use additional arguments for returning objects

[Wall-AF]

How can we create a prototype in a .cspec file that fixes the problem where, for a function call, a compiler creates an additional pointer (to an object) placing it on the stack prior to, optionally any this pointer, followed by subsequent parameters?

A example is the MFC function call:
CPoint CDC::SetViewportOrg(int x, int y)
which in Ghidra becomes:
CPoint SetViewportOrg (CPoint * rPoint, CDC * this, int x, int y)

First, the function is returning an object - this is performed by creating that object prior to the actual call.
Second, a pointer to it is placed on the stack before/after (depending upon the calling convention) the optional this pointer and parameters.