I've not tried it, but how about overriding &CORE::GLOBAL::require? From there, you could use caller() to get information about how modules use each other.
Update: OK, now I've tried it:
use strict;
use warnings;
BEGIN {
*CORE::GLOBAL::require = sub {
my ($mod) = @_;
my $caller = caller;
warn "$caller uses $mod.\n";
CORE::require($mod) unless $mod =~ /^5/;
};
}
use CGI;
It's kind of quick and ugly, but seems to work.
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