TagLib_String fails miserably ... causes a crash.
to be expected with the iostream issues.

Yes ... I get the same (and for TagLib_String_Iterator.t too) , though I'm not getting the TagLib_ID3v2_FrameList.t failure for any of my x86 perls.
However, I think my x64 perl-5.12. is the only x64 perl that I have that passes TagLib_ID3v2_FrameList.t

Anyway ... ppm packages for anyone interested are available from the sisyphusion repo - and there's a link on that page to the patches I applied.

In addition to those patches, I used a rewritten Makefile.PL:

use ExtUtils::MakeMaker;

WriteMakefile(
    NAME              => 'Audio::TagLib',
    MIN_PERL_VERSION  => '5.008001',
    VERSION_FROM      => 'lib/Audio/TagLib.pm', 
    LICENSE           => 'perl',
    XSOPT             => '-C++ -hiertype',
    (
        $Config{'version'} >= 5.005        
        ?                                                     
          (
            ABSTRACT_FROM => 'lib/Audio/TagLib.pm',
            AUTHOR        => 'Geoffrey Leach <gleach@cpan.org>'
          )
        : ()
    ),
    PREREQ_PM => {
        "Encode"       => 0,
        "Test::Deep"   => 0,
        "File::Slurp"  => 0,
        "Test::More"   => 0,
        "Test::Output" => 0,
    },
     "CONFIGURE_REQUIRES" => {
        "ExtUtils::MakeMaker" => 0,
        "Config"              => 0,
    },
);
[download]

and then specified the INC, LIBS and CC settings as args to the 'perl Makefile.PL' command line.

One other problem with the module:

C:\>perldoc Audio::TagLib
Got a 0-length file from C:\MinGW\perl\site\lib\Audio\TagLib.pm via Po
+d::Perldoc
::ToText!?

C:\>
[download]

I don't know what that's about and haven't even looked.

Cheers,
Rob