Mark company-clang-arguments as a safe local variable

init.el

@@ -317,11 +317,18 @@
                                           (list sml/pre-id-separator)
                                           mode-line-rest))))
 
+(defun nil-orlist-of-strings-p (var)
+  "Return t if VAR is either nil or a list holding only strings."
+  (or (null var)
+      (not (null (delq nil
+            (mapcar (lambda (x) (and (stringp x) x)) var))))))
+
 (use-package company
   :config
   (setq company-idle-delay nil
         company-frontends '(company-pseudo-tooltip-frontend
                             company-echo-metadata-frontend))
+  (put 'company-clang-arguments 'safe-local-variable #'nil-or-list-of-strings-p)
   (global-company-mode))
 
 (use-package helm-company