Perl 5.26 is removing the implicit CWD in @INC for security reasons, and this affects loading of perl code from files in both "require" and "do".
Subsequently, both these lines in run_make_tests.pl no longer do as intended:
require "test_driver.pl";
require "config-flags.pm"
Affected end users can apply a temporary workaround of PERL_USE_UNSAFE_INC=1
which should return makes tests to passing.
But a long term strategy of forcing an explicit path loading should be applied.
For instance:
1. Put required libraries in a specific directory
2. `use lib "directory'`
Alternatively, specifying a clearly relative/absolute path to the file
can side-step the @INC traversal mechanic.
require "./test_driver.pl";
require "./config-flags.pm"
Some constructions with FindBin.pm can also be useful, as can forcing an
absolute path with File::Spec->rel2abs(), for instance:
my $file = File::Spec->rel2abs("test_driver.pl");
require "$file";
And at a pinch, simply injecting an explict:
use lib '.'
Will work, ( but it will be subject to security risks/breakage if
any part of your process changes cwd )
This failure was exposed testing Make against Perl 5.25.11 pre-release,
at Gentoo bug: https://bugs.gentoo.org/613772
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