Just delimit the variables with braces i.e 
$SIG{__WARN__} = sub {
    local  ${Log::Log4perl::caller_depth};
    ${Log::Log4perl::caller_depth} =
    ${Log::Log4perl::caller_depth} + 1;
    $logger->logconfess(@_);
};

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HTH

_________
broquaint

In reply to Re: CVS mangles $Log statement (dumb) by broquaint
in thread CVS mangles $Log statement (dumb) by water

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