+: W Add a _pDEPTH argument to function prototypes, and an _aDEPTH
+: argument to the function calls. This means that under DEBUGGING
+: a depth argument is added to the functions, which is used for
+: example by the regex engine for debugging and trace output.
+: A non DEBUGGING build will not pass the unused argument.
+: Currently restricted to functions with at least one argument.
+: