GCC 4.2 was supposed to be the first release that included the patch to fix the many errors produced when compiling wxWidgets.
Where did you hear this? And for that matter, what do you mean by
many errors? wxWidgets compiles with many warnings, but only a few errors with an unpatched GCC 4. Most of the warnings are gone when you use "-Wno-attributes".
At any rate, I have built GCC 4.2 (look for a link in my sig sometime in the next few days), and it does still require a patch in order to compile wxWidgets successfully.