http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49764
--- Comment #12 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-07-17 09:54:56 UTC --- I see on the arduino forum that you've figured out how to run the compiler outside the IDE Now you can add -E to the end of the command, and attach the output file to this bug report, along with the complete command you used to produce it That will be most of the information needed for someone to look at this bug report properly