I’ve been using Getopt::Long and at one point in the code, where I think it should warn(), it doesn’t, unless I run with -w.

Upon inspection, the (Getopt::Long) code directly checks the value of $^W. But I used use warnings;.

That is, the program runs differently with perl program.pl than with perl -w program.pl, even though program.pl contains use warnings; and/or use warnings 'all;

So my question is this: Does checking $^W reflect any use warnings (pragmas?) statements?

One way or the other, the documentation isn’t clear. Unless I’ve misunderstood.