Latest version fails tests on CentOS 7

[marwatk]

It looks like the most recent version fails tests on CentOS 7. You can see the failure using a Docker like this:

docker build - <<EOF
FROM centos:7
RUN yum -y groups install "Development Tools";
RUN yum install -y cpanminus;
RUN cpanm --installdeps Getopt::Long::Descriptive
RUN cpanm -v Getopt::Long::Descriptive
EOF

The error is:

#8 2.120 #   Failed test 'got a warning'
#8 2.120 #   at t/descriptive.t line 454.
#8 2.120 #          got: '2'
#8 2.120 #     expected: '1'
#8 2.130 # Looks like you failed 1 test of 61.
#8 2.133 t/descriptive.t ........
#8 2.133 Dubious, test returned 1 (wstat 256, 0x100)
#8 2.133 Failed 1/61 subtests
#8 2.225 t/shortcircuit.t ....... ok
#8 2.312 t/zzz-check-breaks.t ... ok
#8 2.312
#8 2.312 Test Summary Report
#8 2.312 -------------------
#8 2.312 t/descriptive.t      (Wstat: 256 Tests: 61 Failed: 1)
#8 2.312   Failed test:  59
#8 2.312   Non-zero exit status: 1
#8 2.312 Failed 1/4 test programs. 1/75 subtests failed.

I haven't dived in to see what the actual problem is, yet.

FWIW the changes on App::Cmd also break CentOS 7 since its Perl is 5.16, but I haven't looked into what required the version bump there, either.

[rjbs]

I've made a new release of GLD that issues a diagnostic message when the number of warnings is not 1, indicating either that it received 0 or printing each warning. That will help, here, as I could not reproduce the problem on v5.16 (or otherwise).