just add the lvimrc

.lvimrc

@@ -0,0 +1,9 @@
+" Use this automatically with:
+"
+" Plugin 'embear/vim-localvimrc'
+" let g:localvimrc_ask = 0
+" let g:localvimrc_sandbox = 0
+
+if &filetype ==# 'c' || &filetype ==# 'cpp'
+  setlocal noexpandtab
+endif