??????? ??????? writes: > I was trying to find where the trigonometric functions BODIES are > and couldn't found anything. In the file builtin.c there are many > references to the functions, but not the bodies. They seem to me to be there. Look at expand_builtin_pow(), for example. But only the mathematical functions that are gcc builtins are handled in builtins.c: other functions that are library calls are part of libc, the GNU version of which is at http://www.gnu.org/software/libc/ Andrew.