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I tried to install auto-complete and followed the steps below:

(emacs version: GNU Emacs 24.3.1 (x86_64-unknown-linux-gnu, GTK+ Version 2.18.9))

1) delete dir elpa (make sure it's not installed)

2) M-x package-install RET auto-complete RET

 Leaving directory `/home/taochen/.emacs.d/elpa/popup-20150315.612'
 ^L
 Compiling file /home/taochen/.emacs.d/elpa/popup-20150315.612/popup-pkg.el at Tue Apr 14 10:47:58 2015
 Entering directory `/home/taochen/.emacs.d/elpa/popup-20150315.612/'
 ^L
 Compiling file /home/taochen/.emacs.d/elpa/popup-20150315.612/popup.el at Tue Apr 14 10:47:58 2015
 ^L
 Compiling no file at Tue Apr 14 10:47:58 2015
 Leaving directory `/home/taochen/.emacs.d/elpa/auto-complete-20150408.1132'
^L
Compiling file /home/taochen/.emacs.d/elpa/auto-complete-20150408.1132/auto-complete-config.el at Tue Apr 14 10:47:58 2015
Entering directory `/home/taochen/.emacs.d/elpa/auto-complete-20150408.1132/'

In end of data:
auto-complete-config.el:544:1:Warning: the following functions are not known to be defined:
    semantic-analyze-current-context, semantic-tag-class,
    semantic-tag-function-arguments, yas-expand-snippet,
    semantic-format-tag-type, semantic-format-tag-name
^L
Compiling file /home/taochen/.emacs.d/elpa/auto-complete-20150408.1132/auto-complete.el at Tue Apr 14 10:47:59 2015
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4
  • 2
    It's unclear what you're asking about. Warnings usually concern the developer of the package.
    – wasamasa
    Commented Apr 14, 2015 at 18:06
  • Is the package installed? These warnings do not mean the package failed to install, you can typically ignore them unless it actually failed to compile.
    – Jordon Biondo
    Commented Apr 14, 2015 at 19:05
  • I just noticed the auto-complete mode is not enabled....the package is installed
    – city
    Commented Apr 14, 2015 at 22:09
  • It is the norm for installed packages not to automatically enable themselves and to require extra configuration.
    – wasamasa
    Commented Apr 15, 2015 at 6:41

1 Answer 1

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1

This is normal. I would venture to say that the majority of packages on ELPA trigger some warning(s).

If you build Emacs from source, you'll notice that even Emacs' own files trigger warnings too.

Warnings are not fatal. And it's often a bit of a pain to fix them, so developers may not spend the time to fix them.

Sometimes, warnings are unavoidable. As a developer myself, I usually wrap the offending code in (with-no-warnings ...), but that's a matter of taste.

TL;DR

Don't worry about them. They won't hurt you. :-)

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