[PATCH] PR35457, provide system to backport autoconf 2.60+ bugfixes

[Paolo Bonzini]

Joseph S. Myers wrote:
> On Fri, 18 Apr 2008, Ralf Wildenhues wrote:
> 
>> But that means that if a decision is later made to switch to, say, 2.61
>> but not 2.62, this silently regresses.  If you use the construct I
> 
> I don't see any likely reason to switch to a new version other than the 
> latest (of autoconf and automake, I don't know about libtool).

Regarding libtool, it would be a good time to switch to the latest 
stable release, or even to (yeah!) remove libtool from the GCC tree and 
just tell developers to use 2.2.x.  However, we're not having bugs 
reported on what we currently have, which is why I haven't yet tried to 
do this.

Paolo