Re:

perl -MO=Lint,all,-undefined-subs foo.pl
[download]

I dont know about your version but the 5.6 version says that that should be

perl -MO=Lint,-all,-no-undefined-subs foo.pl
[download]

However I am unconvinced that Lint will catch undefined subs.

The -u issue I cant help you with. :-) Sorry.

HTH

Yves / DeMerphq
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Software Engineering is Programming when you can't. -- E. W. Dijkstra (RIP)