This is a very small script (<100loc) that mirrors gdb's current frame location (file and line) within vim.
It relies on vim's client-server capabilities and does not need any plugins to be installed.
This script works both under Python 2.7 and 3.
Edit .gdbinit to source vim-follow.py
source /path/to/vim-follow.py
In vim, execute :call remote_startserver('gdb'), or alternatively start vim with:
$ vim --servername gdb
Start up gdb, and run the vim follow command.
When you will start debugging, you will notice that the current buffer in vim will reflect the current position in the code.
When you want to stop, run vim unfollow.
You can use any server name you wish, but 'gdb' is set by default in vim-follow.py.
Run vim server customname in gdb and :call remote_startserver('customname') in vim to use customname as a server name.
If you just want to set the location once (without following) just run the vim command without arguments within gdb.