tried it out on the ancient linux box (perl 5.8.5)...
how can I get around this warning?
Upgrade. The version of perl producing the warning is 12 years old which is positively triassic in computing terms. I don't have an installation that old to test it on, but your commands with ->detach work silently on 5.8.8 which is the oldest I have to hand (and is still a decade old).
$ perl -v
This is perl, v5.8.8 built for x86_64-linux-thread-multi
Copyright 1987-2006, Larry Wall
Perl may be copied only under the terms of either the Artistic License
+ or the
GNU General Public License, which may be found in the Perl 5 source ki
+t.
Complete documentation for Perl, including FAQ lists, should be found
+on
this system using "man perl" or "perldoc perl". If you have access to
+ the
Internet, point your browser at http://www.perl.org/, the Perl Home Pa
+ge.
$ perl -Mthreads -le 'async { sleep 100; }->detach ; exit;'
$
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