Cross posting on Stackoverflow http://stackoverflow.com/questions/28709936/perl-error-related-to-encode-pm

I have the following software:

Ubuntu Linux 14.04 LTS

$ uname -a
Linux XXX 3.13.0-45-generic #74-Ubuntu SMP Tue Jan 13 19:36:28 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

Perl 5.18:

$ perl -version

This is perl 5, version 18, subversion 2 (v5.18.2) built for x86_64-linux-gnu-thread-multi
(with 41 registered patches, see perl -V for more detail)

and Encode.pm 2.49:

$ head -n 10 /usr/lib/perl/5.18/Encode.pm
#
# $Id: Encode.pm,v 2.49 2013/03/05 03:13:47 dankogai Exp dankogai $

When I use ikiwiki, which is a package using Encode.pm, I got the following error:

$ ikiwiki --setup ~/wiki.setup
Cannot decode string with wide characters at /usr/lib/perl/5.18/Encode.pm line 176.

Lines 166 - 180 of Encode.pm reads:

sub decode($$;$) {
    my ( $name, $octets, $check ) = @_;
    return undef unless defined $octets;
    $octets .= '';
    $check ||= 0;
    my $enc = find_encoding($name);
    unless ( defined $enc ) {
        require Carp;
        Carp::croak("Unknown encoding '$name'");
    }
    my $string = $enc->decode( $octets, $check );
    $_[1] = $octets if $check and !ref $check and !( $check & LEAVE_SRC() );
    return $string;
}

Does any kind soul have idea how to fix this issue?

Fix

I fixed it by adding

sub decode($$;$) {
    my ( $name, $octets, $check ) = @_;
    return undef unless defined $octets;
    return $octets if Encode::is_utf8($octets);  # add this check
    $octets .= '';
Comment by Qi Wed Feb 25 01:43:26 2015

This looks like Debian bug #776181, although I'm surprised you're seeing it on such an old version of Encode. What version of IkiWiki is this?

Please try reverting the change you made to Encode.pm, and making the change to IkiWiki shown on that bug report instead. (If you don't know how to read diffs, the short version is: delete the lines prefixed with "-", add the lines prefixed with "+".)

I've made the same change in ikiwiki git master, so this should be fixed in the next release (>= 3.20150301).

Comment by smcv Sun Mar 1 08:55:20 2015