Instead of removing auto-newline, control it via a variable

layers/+lang/c-c++/README.org

@@ -13,6 +13,7 @@
     - [[#company-clang-and-flycheck][Company-clang and flycheck]]
   - [[#rtags-configuration][RTags configuration]]
   - [[#enable-google-set-c-style][Enable google-set-c-style]]
+  - [[#newlines][Newlines]]
 - [[#key-bindings][Key Bindings]]
   - [[#formatting-clang-format][Formatting (clang-format)]]
   - [[#rtags][RTags]]
@@ -131,6 +132,16 @@ set that up like this:
             c-c++-enable-google-newline t)
 #+END_SRC emacs-lisp
 
+** Newlines
+
+You can enable the =Auto-newline= minor mode that automatically adds newlines
+after certain characters by setting the =c-c++-enable-auto-newline= vairable.
+
+#+BEGIN_SRC emacs-lisp
+     (c-c++ :variables
+            c-c++-enable-auto-newline t)
+#+END_SRC emacs-lisp
+
 * Key Bindings
 
 | Key Binding | Description                                                   |

layers/+lang/c-c++/config.el

@@ -17,6 +17,9 @@
 (defconst c-c++-mode-hooks '(c-mode-hook c++-mode-hook)
   "Primary hooks of the `c-c++' layer.")
 
+(defvar c-c++-enable-auto-newline nil
+  "If non nil then enables the `Auto-newline' minor mode.")
+
 (defvar c-c++-enable-clang-support nil
   "If non nil Clang related packages and configuration are enabled.")
 

layers/+lang/c-c++/funcs.el

@@ -9,6 +9,10 @@
 ;;
 ;;; License: GPLv3
 
+(defun spacemacs//c-toggle-auto-newline ()
+  "Toggle auto-newline."
+  (c-toggle-auto-newline 1))
+
 
 ;; clang
 

layers/+lang/c-c++/packages.el

@@ -43,7 +43,9 @@
     :init
     (progn
       (add-to-list 'auto-mode-alist
-                   `("\\.h\\'" . ,c-c++-default-mode-for-headers)))
+                   `("\\.h\\'" . ,c-c++-default-mode-for-headers))
+      (when c-c++-enable-auto-newline
+        (add-hook 'c-mode-common-hook 'spacemacs//c-toggle-auto-newline)))
     :config
     (progn
       (require 'compile)