[Bug c/57345] Preprocessor fails to evaluation string token not valid

[pinskia at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57345

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
I think GCC is correct as it is processing the macros after they have been
redefined even though they are using #elif.