Hi, sorry to ask a daft question, but are default include files (eg: stdc-predef.h) only included in the main file ? So can I safely assume that if a particular file's include type is IT_DEFAULT or IT_CMDLINE (passed by -include), then the file #including it, shall be the main file (ie _cpp_file->main_file shall be true for that file) ? Thanks and Regards, Prathamesh