ACDIR should be disabled by default

[Vincent Lefevre]

Hi,

The ACDIR feature leads to various practical problems, such as:

  * Possible clash between software that installs files in
    ${prefix}/share/aclocal/; in particular, there isn't any namespace
    mechanism, it is difficult to say which file belongs to which
    software, and this makes debugging difficult (since different
    machines will often be likely to show different behaviors).

  * A software that installs a buggy file can more or less break
    aclocal, or make it output spurious warning messages, even though
    the definitions provided by such a file will not be used by the
    software that needs to run the autotools.

  * Performance is degraded for no good reasons.

Thus this feature should be disabled by default, or at least be
deprecated in favor of a cleaner mechanism.

Regards,

-- 
Vincent Lefèvre <address@hidden> - Web: <http://www.vinc17.org/>
100% accessible validated (X)HTML - Blog: <http://www.vinc17.org/blog/>
Work: CR INRIA - computer arithmetic / Arenaire project (LIP, ENS-Lyon)