TLDR: $ vim sample.txt line 45: E568: duplicate cscope database not added Press ENTER or type command to continue Fix: Add ‘set nocscopeverbose‘ to .vimrc
Detailed: My primary editor for writing code is Vim (http://www.vim.org/) combined with couple of plugins. The cscope_maps.vim (http://cscope.sourceforge.net/cscope_maps.vim) plugin is immensely helpful in code navigation. However, there is an issue with that plugin, particularly in this part of the code. 40 " add any cscope database in current directory 41 if filereadable("cscope.out") 42 cs add cscope.out 43 " else add the database pointed to by environment variable 44 elseif $CSCOPE_DB != "" 45 cs add $CSCOPE_DB 46 endif 47 48 " show msg when any other cscope db added 49 set cscopeverbose
To use that plugin, one has to build cscope database on codebase, details of which are given here (http://cscope.sourceforge.net/cscope_vim_tutorial.html) . Imagine if your codebase is like this: $ project1/a/b/c $ project2/x/y/z You have created a cscope database in the root directory of each project. Vim has to be configured to recursively look for cscope database up the directory until the root of project1. I think out-of-the-box Vim comes with this support (not sure). If $CSCOPE_DB is defined and points else where (say cscope database within project2), the search gets messed up even further. Opening a file in Vim would then throw following (or similar looking) errors. $ vim sample.txt line 45: E568: duplicate cscope database not added Press ENTER or type command to continue Above error means that Vim is compiled with a cscope module and adding another cscope database (line 45) is akin to opening a second database (duplicate). Vim complains. But it is like a warning. You can check what is the first cscope database added/connected using ‘:cscope show‘ command. Easiest fix is to suppress the warnings. Change line 49 to ‘set nocscopeverbose‘ or add it in .vimrc file (latter worked for me).
Content of this post is heavily borrowed from Reference:  https://blogs.oracle.com/natarajan/entry/avoiding_duplicate_cscope_database_error  http://vim.1045645.n5.nabble.com/search-upward-of-cscope-out-file-td1160687.html