Bug#913347: perl: $^X is empty in 5.28 when /proc is not mounted

[Niko Tyni]

Package: perl
Version: 5.28.0-3
Severity: normal
Tags: upstream
User: debian-perl at lists.debian.org
Usertags: perl-5.28-transition

As reported by Holger Levsen, after upgrading perl to 5.28 the munin
package started to FTBFS when /proc is not mounted.

The underlying reason is that $^X is now empty in those circumstances.

This bisects to v5.27.5-43-gfca5fb9612:

  https://perl5.git.perl.org/perl.git/commitdiff/fca5fb9612a125f48173bedf2c079778d7bc54dd

which was apparently supposed to be a non-op, but missed the fact that
the branches used to fall through to the fallback case when the result
was otherwise empty.

This should ideally be fixed upstream and backported to our 5.28 packages.
-- 
Niko Tyni   ntyni at debian.org