In order to avoid some Unicode bugs, unicode_strings is recommended. For utf-8 input and output, use open ":encoding(UTF-8)". However it is probably wise to respect the local configuration, which is what I do instead in the code below. Lastly you need to tell the perl interpreter that the literal strings in your source code are utf-8, via "use utf8;".

So with any luck, the code below should work:

use strict;
use warnings;
use feature 'unicode_strings';
use open ":locale";
use utf8;

print "Çrçös\n";
print "Çirçös—\n";
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