Re: Autoconf <-> CVS M4 interactions

[Ralf Wildenhues]

Hi Eric,

* Eric Blake wrote on Fri, Jun 16, 2006 at 09:36:41PM CEST:
> > 
> > M4 upgrade scenario:

> Indeed, I will not allow CVS M4 to be released as m4-2.0 until I am
> satisfied that this very scenario works without regressions

Good.  Well, my testing then has two results: one bug in Autoconf and...

> >     * bin/autoupdate.in (handle_autoconf_macros): Do not
> >     _au__undefine the builtins that aren't defined, before restoring
> >     the original ones.  Fixes warnings issues by CVS M4.
> 
> That is safe, but I'd rather figure out the underlying cause of why
> CVS m4 is not defining builtins in the first place.

...one likely bug in CVS m4.  Sounds to me like we should rather not
apply this second patch: exposing a potential issue is better than
hiding it; after all, those were only warnings, and only for a not-so-
often used tool.

Cheers,
Ralf