help me

[Zille Eizad]

what i m trying to do is port gcc on power pc ppc405. i need to find out 
how much of the source code of gcc is written in assembly. well thats not a 
problem. but the problem is i need to find out which library functions are 
defined in which files and what header files are required for them? so i can 
eliminate any unwanted functions and make the library slim. it will be nice to 
get some help in this regard.
 
zille eizad