bug#17258: autogen.sh doesn't update stale autoconf files in build-aux

[Eli Zaretskii]

> From: Achim Gratz <Stromeko@nexgo.de>
> Date: Sun, 13 Apr 2014 11:17:16 +0200
> 
> 
> While troubleshooting a problem with configure on my system, I found
> that autogen.sh never updated these autoconf files in build-aux, so they
> were still the same as when they had been generated/copied three years
> ago:
> 
> build-aux/compile
> build-aux/config.guess
> build-aux/config.sub
> build-aux/install-sh
> build-aux/missing
> build-aux/depcomp
> 
> Apparently these files are just checked for existence unless the
> "--force" option is also given (which autogen.sh doesn't do).  I'm
> currently using autoconf 2.69 if that matters.

Aren't these files created by automake, which is invoked by
autoreconf?  If so, this is not really an Emacs problem, is it?