Re: pgsql: Adjust configure to insist on Perl version >= 5.8.3.

Noah Misch <noah(at)leadboat(dot)com> writes:
> On Sun, Oct 10, 2021 at 01:17:10PM -0400, Tom Lane wrote:
>> The closest I can get to what we want using cpanm is with this recipe:
>> cpanm install Test::Simple(at)0(dot)87_01
>> cpanm install IPC::Run(at)0(dot)79
>> cpanm install ExtUtils::MakeMaker(at)6(dot)50 # downgrade

> While the MakeMaker litter is annoying, I'm not too worried about it. The
> only other thing I'd consider is doing the MakeMaker 6.50 install before
> Test::Simple, not after.

Tried that to begin with, doesn't work. There are at least two problems:

1. Before anything else, the first invocation of "cpanm install" wants
to pull in "install". That seems to be a dummy module, but it's not
without side-effects: it updates ExtUtils to current. If your first
request is "cpanm install ExtUtils::MakeMaker(at)6(dot)50", the version
specification is effectively ignored.

2. I then tried doing a second "cpanm install ExtUtils::MakeMaker(at)6(dot)50",
and that did successfully downgrade to 6.50 ... but then the request
to update Test::Simple upgraded it again. I'm not really sure why
that happened. It looks more like a cpanm bug than anything Test::Simple
asked for.

I didn't do exhaustive experimentation to see if putting the downgrade
before "install IPC::Run" would work. I think we're best off assuming
that cpanm will cause that upgrade due to phase-of-the-moon conditions,
so putting the downgrade last is the most robust recipe.

regards, tom lane