From 297f5ea431b77e02fe611d3468f46b56ea32dd5c Mon Sep 17 00:00:00 2001
From: Wang Shidong <wsdjeg@outlook.com>
Date: Fri, 18 Dec 2020 16:42:15 +0800
Subject: [PATCH] Fix unknown function gtags#update (#4009)

---
 autoload/SpaceVim/layers/gtags.vim | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/autoload/SpaceVim/layers/gtags.vim b/autoload/SpaceVim/layers/gtags.vim
index 2ba149bf27c1..55d2c45ae4ee 100644
--- a/autoload/SpaceVim/layers/gtags.vim
+++ b/autoload/SpaceVim/layers/gtags.vim
@@ -37,8 +37,13 @@ function! SpaceVim#layers#gtags#config() abort
   if s:auto_update
     augroup spacevim_layer_gtags
       autocmd!
-      au BufWritePost * call ctags#update()
-      au BufWritePost * call gtags#update(1)
+      " gtags#update() function only exist when gtags is available
+      if executable('gtags')
+        au BufWritePost * call gtags#update(1)
+      endif
+      if executable('ctags')
+        au BufWritePost * call ctags#update()
+      endif
     augroup END
   endif
 endfunction