I tried to reproduce your error: 
$ echo 'package A; sub foo { }; 1' > A.pm
$ echo 'package B; use A; 1;' > B.pm
$ perl -w -I. -MA -wle 'use B'
# no warnings here

[download]

I use A twice, once via the command line, and once indirectly by using B. The -w switch actives warnings globally, and still no warnings about redefinitions.

Maybe you could show us some code that demonstrates your problem?

In reply to Re: Circular dependencies when using the perl syntax checker by moritz
in thread Circular dependencies when using the perl syntax checker by tomdee

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