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I want code completion for C/C++ functions and variables from headers. I tried to install Auto-complete and Company, but C/C ++ functions/variables aren't complemented.

Here is the relevant portion of my .emacs file:

;; Auto-complete (AC) (require 'auto-complete) (require 'auto-complete-config) (ac-config-default)
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  • Please post the relevant part of your init file that shows how you are using auto-complete and/or company. Commented Mar 30, 2016 at 13:25
  • I'm using gist.github.com/soonhokong/7c2bf6e8b72dbc71c93b and gnu.org/software/global which works decently for the relatively small projects that I have. Commented Mar 30, 2016 at 15:24

1 Answer 1

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A vanilla company install wont quite get you where you want; you'll need to use use something like the company-c-headers package. Tuhdo has written an excellent document on using Emacs as a C/C++ IDE, which has instructions on setting up company-c-headers, along with a lot of other stuff.

I don't know what Emacs version you're using, but in 24.5 with Company, you'd do something like this:

  1. Install the company-c-headers package from MELPA -- M-x package-install company-c-headers

  2. Add this to your emacs config file (init.el / .emacs.d / whathaveyou)

    (require 'company) (add-hook 'global-init-hook 'global-company-mode) (add-to-list 'company-backends 'company-c-headers)

Note that company-c-headers by default only searches two paths for headers. If you want it to search others, you'll need to add them yourself. (For more on that, see Tuhdo)

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