In the last couple of months, I created a white paper about GCC front-end internals. This white-paper is not yet complete and there are many many other areas of the compiler which are worth describing.
So, if you do have any valuable feedback for the white paper or if you do have areas which you wish to get some internal documentation about, please just let me know and I will think about adding more sections.
Just drop me a comment or an eMail (firstname.lastname@example.org) …
The white paper could be downloaded here!