I moved to Fedora 9 last week, and things have been working great, except for my vim, which yelled everytime I tried opening a file:

-------------------------------------------------
ego@sofia:~$ vim ~/.vimrc
Error detected while processing /home/ego/.vimrc:
line   10:
E563: stat(./cscope.out) error: 2
Press ENTER or type command to continue
-------------------------------------------------

I use vim for all my development work, and use cscope to find my way through the code. I used kvaneesh’s .vimrc script to allow me to seamlessly invoke cscope commands from.
That part of the .vimrc file looked like:

----------------------------------------------------------------------------------
if has("cscope")
        cs add ./cscope.out

        " use both cscope and ctag for 'ctrl-]', ':ta', and 'vim -t'
        set cscopetag
        " check cscope for definition of a symbol before checking ctags: set to 1
        " if you want the reverse search order.
        set csto=0

        set grepprg=cscope\ -R\ -L\ -3

        " The following maps all invoke one of the following cscope search types:
        "
        "   's'   symbol: find all references to the token under cursor
        "   'g'   global: find global definition(s) of the token under cursor
        "   'c'   calls:  find all calls to the function name under cursor
        "   't'   text:   find all instances of the text under cursor
        "   'e'   egrep:  egrep search for the word under cursor
        "   'f'   file:   open the filename under cursor
        "   'i'   includes: find files that include the filename under cursor
        "   'd'   called: find functions that function under cursor calls
        "
        map tl :exe 'cs find g '  .expand("<cword>")<CR>
        map ta :exe 'cs find t '  .expand("<cword>")<CR>
        map tf :exe 'cs find c '  .expand("<cword>")<CR>
        map tg :exe 'tab cs find g '  .expand("<cword>")<CR>
        map gr :exe 'cs find c ' .expand("<cword>")<CR>
        map tr :exe 'cs find c ' .expand("<cword>")<CR>
        map st :exe 'cs find g '  .tolower(expand("<cword>"))<CR>

endif
----------------------------------------------------------------------------------

This used to work fine on Ubuntu Edgy Eft and Gutsy Gibbon.

However, this failed on Fedora9 which has Vim 7.1.  So I read up the vimrc help, and found out this function called

filereadable(filename),

which will return true if the file exists and is readable.

So I changed the script to:

----------------------------------------------------------------------------------
if has("cscope")
if filereadable("./cscope.out")
        cs add ./cscope.out
endif
.
.
.
endif
----------------------------------------------------------------------------------

This one too failed to work, giving another new error message:

----------------------------------------------------------------------------------
ego@sofia:~/git/linux-2.6$ vim kernel/sched.c
Error detected while processing /home/ego/.vimrc:
line   11:
E568: duplicate cscope database not added
Press ENTER or type command to continue
----------------------------------------------------------------------------------

After poking around a bit, I used one more function,

exists(filename)

and this time my .vimrc looked like:

----------------------------------------------------------------------------------
if has("cscope")
if exists("./cscope.out")
        cs add ./cscope.out
endif
.
.
.
endif
----------------------------------------------------------------------------------

This one worked!

However, it fails on the older vim versions, where

filereadable()

seems to work!

Developers! They love change
PS: kvaneesh runs the same version as I do.. But he’s running it on Ubuntu 8.04. So may be this is an issue with how the distros have patched the Vim.