Shut gutentags up when exiting

test.patch

diff --git a/autoload/gutentags.vim b/autoload/gutentags.vim
--- a/autoload/gutentags.vim
+++ b/autoload/gutentags.vim
@@ -349,6 +349,11 @@ function! gutentags#setup_gutentags() ab
     endfor
 endfunction
 
+" Set a variable on exit so that we don't complain when a job gets killed.
+function! gutentags#on_vim_leave_pre() abort
+    let g:__gutentags_vim_is_leaving = 1
+endfunction
+
 " }}}
 
 "  Job Management {{{
diff --git a/autoload/gutentags/ctags.vim b/autoload/gutentags/ctags.vim
--- a/autoload/gutentags/ctags.vim
+++ b/autoload/gutentags/ctags.vim
@@ -185,7 +185,7 @@ endfunction
 function! gutentags#ctags#on_job_exit(job, exit_val) abort
     call gutentags#remove_job_by_data('ctags', a:job)
 
-    if a:exit_val != 0
+    if a:exit_val != 0 && !g:__gutentags_vim_is_leaving
         call gutentags#warning("ctags job failed, returned: ".
                     \string(a:exit_val))
     endif
diff --git a/plugin/gutentags.vim b/plugin/gutentags.vim
--- a/plugin/gutentags.vim
+++ b/plugin/gutentags.vim
@@ -87,6 +87,8 @@ else
     let g:gutentags_script_ext = '.sh'
 endif
 
+let g:__gutentags_vim_is_leaving = 0
+
 " }}}
 
 " Gutentags Setup {{{
@@ -95,6 +97,7 @@ augroup gutentags_detect
     autocmd!
     autocmd BufNewFile,BufReadPost *  call gutentags#setup_gutentags()
     autocmd VimEnter               *  if expand('<amatch>')==''|call gutentags#setup_gutentags()|endif
+    autocmd VimLeavePre            *  call gutentags#on_vim_leave_pre()
 augroup end
 
 " }}}