(use-package company-c-headers
  :config
  (add-hook 'c-mode-common-hook (lambda () (add-local-company-backend 'company-c-headers)))
  (add-to-list 'company-c-headers-path-system "/usr/include/c++/7/"))

(use-package rtags
  :config
  (use-package company-rtags)
  (use-package flycheck-rtags)
  (when (featurep 'helm)
    (use-package helm-rtags)
    (setq rtags-display-result-backend 'helm))
  (setq
   rtags-autostart-diagnostics t
   rtags-completions-enabled t
   rtags-imenu-syntax-highlighting t
   rtags-jump-to-first-match nil
   rtags-rdm-process-use-pipe t
   rtags-timeout 1200
   )
  (rtags-diagnostics)
  (add-hook 'c-mode-hook   (lambda () (add-local-company-backend 'company-rtags)))
  (add-hook 'c++-mode-hook (lambda () (add-local-company-backend 'company-rtags)))
  (rtags-enable-standard-keybindings)
  (add-hook 'c-mode-hook   #'rtags-start-process-unless-running)
  (add-hook 'c++-mode-hook #'rtags-start-process-unless-running)
  (rtags-set-periodic-reparse-timeout 8)
  (bind-keys :map c-mode-base-map
             ("M-." . rtags-find-symbol-at-point)
             ("M-," . rtags-find-references-at-point))
  (defadvice save-buffers-kill-terminal
      (before save-buffers-kill-terminal-before activate)
    "Hack to make Emacs stop asking to kill rdm when closing."
    (rtags-quit-rdm)
    (sit-for 0.1)))

(use-package cmake-ide
  :bind ("<f5>" . cmake-ide-compile)
  :config
  (require 'rtags)
  (cmake-ide-setup)
  (add-hook 'c-mode-hook   #'cmake-ide-load-db)
  (add-hook 'c++-mode-hook #'cmake-ide-load-db)
  (setq cmake-ide-src-extensions '(".c" ".cpp" ".C" ".cxx" ".cc" ".c++")))