CC flags and the like
I've been fiddling around with linux for a while now and I'm curious about the CC flags and CFLAG extensions that some installation text files talk about. As I understand it from reading it passes certain instructions to the configuration / compilation, some of which might optimise a program better for a particular machine. I can't find any info that talks about what flags exist, or what they do. Does anyone know anywhere where I might find such a guide?