newlib: require autoconf-2.69

[Mike Frysinger]

On 07 Jan 2022 10:56, Corinna Vinschen wrote:
> On Jan  5 20:46, Mike Frysinger wrote:
> > On 05 Jan 2022 13:10, Corinna Vinschen wrote:
> > > On Dec 30 13:39, Mike Frysinger wrote:
> > > > The top-level newlib dir is already using autoconf-2.69, and all the
> > > > subdirs are using autoconf-2.68.  Update them all to use 2.69 as a
> > > > prereq and then regenerate them accordingly.
> > > > 
> > > > The README file already says to use autoconf-2.69.
> > > 
> > > Yeah, but...
> > > 
> > > The AC_PREREQ only checks for the minimum required autoconf version for
> > > *this* specific autoconf file.  AC_PREREQ([2.52]) doesn't mean we have to
> > > use 2.52, but any later version will suffice.  All current autoconf
> > > files are compatible with 2.69.  Neither binutils-gdb, nor gcc changed
> > > their files to require 2.69.  So it's note quite clear to me what this
> > > patch accomplishes.
> > 
> > that's incorrect.  gcc & binutils-gdb have config/override.m4 which requires
> > autoconf-2.69 exactly is used.  no older versions, no newer versions, only
> > 2.69 is permitted.
> 
> You're right, but that's not what I was up to.  Requiring 2.69 doesn't
> mean we have to (or even should) change AC_PREREQ in every single file.
> But, anyway, it probably won't hurt either, so just go ahead.

that's true.  but then i'd question what's the point of AC_PREREQ in the first
place.  if we move to override.m4, maybe we delete all the AC_PREREQ calls ?
-mike
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