Perldoc Search: "$^C" perl-5.20.1
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947 : $^C The current value of the flag associated with the -c switch. Mainly of use with -MO=... to allow code to alter its behavior when being compiled, such as for example to "AUTOLOAD" at compile time rather than normal, deferred loading. Setting "$^C = 1" is similar to calling "B::minus_c".