I am sure there is no tool, free or otherwise, for making C++ code unicode
If you are talking of Windows code, you could make a start by just putting
"#define UNICODE" before the windows headers. Then, you will have a lot of
editing to do.
I have just finished that sort of project, so as to be able to handle
arbitrary (non-Ansi) filenames. As in my Fontlist v.5,
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