<< cpplib fragment handling >>

• Use cpplib's (existing but disabled) include file cache.
• Also remember chain of fragments.
• cpplib logic and directive handling mostly unchanged.
• After directive or file start call enter_fragment call-back.
• Before next directive or file end call exit_fragment call-back.
• If first time seen, tells front-end to remember declarations.
• If fragment was previously-read, call-back checks dependencies for validity. On success, remembered declarations are "pushed" into top binding_level.
• If enter_fragment succeeds, cpplib skips forward to end of fragment.