The common CHG script has the same name as the component/compiler. A script specific only for a certain processor family must be enlarged by _<family> suffix in file name; this script will be executed after the common script (of course only if the target processor belongs to the corresponding family). Finally, a script may exist with a name extended by _ZZ_finish; such script will be run in the end.
All the CHG scripts above are optional; however, it is recommended that at least common CHG script exists. If common CHG does not exists, none of these described above will be launched.