Re: wondering if this is acceptable

[Ralf Wildenhues]

Hello Matt,

* Matt Rice wrote on Thu, Feb 05, 2009 at 11:51:58AM CET:
> ac_configure_args="$ac_configure_args foo=$ac_pwd"
> AC_CONFIG_SUBDIRS(stuff)
> 
> none of the build dir variants appeared to be set at the time.
> it looks like adding things ac_configure_args is fairly common
> but neither of these are documented...
> so wondering if this tinkering could break in the future?

Well, it will already break right now if $ac_pwd contains white space.
And you are right in that ac_configure_args is an undocumented detail,
not a documented interface.  However, it is rather widely used, so that
we should not break it if at all avoidable.  Please note though that its
contents are later eval'ed, so suitably quoting might be necessary.
(Earlier Autoconf versions had bugs in this regard.)

Hope that helps.

Cheers,
Ralf