Preprocessor: How do I get a listing of the preprocessor output?
Q: How do I get a listing of the preprocessor output that is translated from the Arduino C code?
A: Take a look at sources/user.c in the root directory of the IDE. user.c contains the C translation of your program (Arduino syntax).
Original forum post of Regis: http://forum.pinguino.cc/showthread.php?tid=4245&pid=8933#pid8933