How do you use __WXFUNCTION__?

[Bob]

I'm trying to port some code that used __func__ to identify the current
function,
to GCC that uses something else, so I'm trying to use __WXFUNCTION__ as
documented
here:

http://www.lpthe.jussieu.fr/~zeitlin/wxWindows/docs/wxwin_miscellany.html#w=
xfunction

This version compiles, unlike all of my other attempts:

wxLogVerbose( wxT( "File: %s Function: %s Line: %d" ), wxT(__FILE__),
__WXFUNCTION__, __LINE__ );

but returns this:

08:53:40: File: program.cpp Function: ???t Line: 74

Clearly the functions is not called "???t".

What am I doing wrong?

This is with GCC wx2.8.7 UNICODE.
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