Re: AC_FUNC_FSEEKO and optional execution

[Thomas Dickey]

On Mon, 23 Mar 2009, Eric Blake wrote:

> AC_FUNC_FSEEKO was rewritten for 2.61, but a typo rendered it broken in
> that release, so it didn't work again until 2.62.
>
> > This is exactly why I hate relying on cache variables.  :)
>
> Relying on documented cache variables is fine.  But you are correct that
> relying on undocumented cache variables tends to be problematic.

It appears that most of the cache variables set by autoconf are 
undocumented (and that of those which are, several such as the ones 
related to compiler checks have changed over the years).

Perhaps the autoconf documentation should be improved, to note this 
problem.

--
Thomas E. Dickey
http://invisible-island.net
ftp://invisible-island.net