How to setup perl to always run code coverage

Question

I'd like to setup my project to always run the scripts through perl's Devel::Cover module. I've tried replacing the perl binary with something like this

#!/bin/sh
exec /usr/local/bin/original-perl -MDevel::Cover $@

with no success. I'd like to avoid modifying the #! for every script on my system (not the end of the world, I'd just like to figure out a more global solution).

Any thoughts on how to turn on Devel::Cover globally?

Edit: Not trying to run this in production, just trying some experiments to figure out how to split up a tightly coupled codebase. Having some automated way to see what source files are needed for a given subsystem (at least as a start) would be helpful

Answer 1

You can set the environment variable PERL5OPT to always load -MDevel::Cover.

export PERL5OPT="-MDevel::Cover"

See perlrun for an explanation of this.

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But as Michael Carman said, why would you do this? It will have significant performance costs and might not be useful if you don't run tests.