(Win32) The -C Switch Has Been Repurposed
The -C switch has changed in an incompatible way. The old semantics of this switch only made sense in Win32 and only in the ``use utf8'' universe in 5.6.x releases, and do not make sense for the Unicode implementation in 5.8.0. Since this switch could not have been used by anyone, it has been repurposed. The behavior that this switch enabled in 5.6.x releases may be supported in a transparent, data-dependent fashion in a future release.

For the new life of this switch, see UTF-8 no longer default under UTF-8 locales, and -C in the perlrun manpage.