I just had a 328 and a 328p everywhere, with the only difference being the signature
makes sense about the gcc, since I can upload no problem with avrdude but haven't tried compiling anything yet
I did notice tho when I was switching it back and forth, when I had it changed to the non p and did a regular serial upload without the bootloader it said invalid signature, even though it was the right one, I guess the optiboot tells avrdude the sig instead of checking everytime?