I always get a chuckle out of the knuckleheads claiming "C is portable." Even ignoring all the libc and type size assumptions, there are so many "portable" programs out there that won't compile on anything but GCC because the extensions are on by default and people sometimes don't even know they're using them. This gets real amusing when a new version of GCC decides to deprecate them (one example of this I ran into recently was lvalue casts).
