On Tue, Oct 16, 2012 at 01:04:46AM -0700, Ned Deily wrote:
> In article <20121016071236.0792d250...@webabinitio.net>,
> "R. David Murray" <rdmur...@bitdance.com> wrote:
> > My understanding is that we use a specific version of autoconf.
> > The reason is that otherwise we end up with useless churn in the repo
> > as the generated file changes when different committers use different
> > versions. In the past we have had issues with a new autoconf version
> > actually breaking the Python build, so we also need to test a new version
> > before switching to it.
>
> Well, there was a test in the past for a specific version of autoconf
> but I believe that was removed. I see that the default branch
> configure.ac contains AC_PREREQ(2.65) but the most recently checked-in
> version of configure was generated with 2.68.
That's a good point regarding AC_PREREQ. I think there's been a
general unspoken rule to try and minimize 'configure' churn, which
means using the same version of autoconf that the previous person
used.
> I understand about the
> desirability of avoiding a lot of churn although it seems to me to not
> be a huge thing;
I don't know, the churn is usually offensive enough to warrant using
the same autoconf version. It's impossible to vet a configure.ac
change if you're regenerating configure with a different version of
autoconf.
> build breaking is another matter, of course. If we are
> going to mandate a specific version again, that should be documented and
> checked for.
My preference: bump to 2.69 and set AC_PREREQ(2.69). If 2.69 proves
unworkable, revert back to 2.68 and AC_PREREQ(2.68).
I definitely like the idea of explicitly setting the version being
used via AC_PREREQ, as this will prevent accidental version churn
being checked in by a committer inadvertently.
> --
> Ned Deily,
> n...@acm.org
Trent.
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