GNU C/C++ compiler

Hi all!

I'm hoping to find someone that is knowleddgable of the GNU C/C++ compiler (I'm using verision 4.0.2). I have a project in which I need to look through the code in the compiler (and there is a LOT of it) to find ways in which the compiler handles human usable output. I've been looking through the files and have found that many print information within them and there are many different ways of printing information (printf(), GC_err_print(), WARN(), etc) but I feel like I should be finding more information than I am. :confused:

I'm wondering if anyone had any information that might guide me to find more of what I'm looking for, such as error handling and where the text printing is defined. Any help would be very greatly appreciated. Thanks!