Flycheck extension for Apple’s Xcode.
(use-package flycheck-xcode
  :ensure t
  :commands (flycheck-xcode-setup)
  :init
  (mapc
   (lambda (x)
     (add-hook x #'flycheck-xcode-setup))
   '(c-mode-hook c++-mode-hook objc-mode-hook swift-mode-hook)))These are screenshots comparing Emacs vs Xcode’s display of errors/warnings.



