I was recently reminded of an old (and I do mean really old)
tool for C coding: cscope
So I added some support for it in 762030fb and friends.
There is apparently some decent vi(m) support for it
However, I belong to the Other Tribe. I didn't find anything quite
to my liking in the jungles of E-Macs, so I hacked up some.
Some elisp attached. I may later githubify it, or something.