How to programmatically create/update a TAGS file with emacs?

Question

Is there any plugin for emacs to automatically update the TAGS file in my C project (for example on buffer save or access) or create a new one if there is no TAGS file present?

Answer 1

Why not add an execution of ctags to your build script? You really only need a new tags file when you compile (at the most). I tend to just write a scheduled task to build the tags file every night. Seems to work pretty well.