llvm style for C/C++ by default

init.el

@@ -75,10 +75,44 @@
           (setq-local fill-column 100))
 
 (require 'cc-mode)
+
+;;; Copypasta of llvm/utils/emacs/emacs.el
+;; LLVM coding style guidelines in emacs
+;; Maintainer: LLVM Team, http://llvm.org/
+(defun llvm-lineup-statement (langelem)
+  (let ((in-assign (c-lineup-assignments langelem)))
+    (if (not in-assign)
+        '++
+      (aset in-assign 0
+            (+ (aref in-assign 0)
+               (* 2 c-basic-offset)))
+      in-assign)))
+
+;; Add a cc-mode style for editing LLVM C and C++ code
+(c-add-style "llvm.org"
+             '("gnu"
+               (fill-column . 80)
+               (c++-indent-level . 2)
+               (c-basic-offset . 2)
+               (indent-tabs-mode . nil)
+               (c-offsets-alist . ((arglist-intro . ++)
+                                   (innamespace . 0)
+                                   (member-init-intro . ++)
+                                   (statement-cont . llvm-lineup-statement)))))
+
+;; Files with "llvm" in their names will automatically be set to the
+;; llvm.org coding style.
+(add-hook 'c-mode-common-hook
+          (function
+           (lambda nil
+             (if (string-match "llvm" buffer-file-name)
+                 (progn
+                   (c-set-style "llvm.org"))))))
+
 (setq c-default-style '((java-mode . "java")
                         (awk-mode . "awk")
-                        (c-mode . "linux")
+                        (c-mode . "llvm.org")
-                        (c++-mode . "stroustrup")
+                        (c++-mode . "llvm.org")
                         (other . "stroustrup")))
 
 ;; completion