gcc14: ICE on qdebug.h of Qt4: internal compiler error: in objc_eh_runtime_type, at objc/objc-next-runtime-abi-01.cc:2798

[barracuda156]

Qt4 in qdebug.h has a chunk of code which sends GCC into ICE:

    inline ~QDebug() {
        if (!--stream->ref) {
            if(stream->message_output) {
                QT_TRY {
                    qt_message_output(stream->type, stream->buffer.toLocal8Bit().data());
                } QT_CATCH(std::bad_alloc&) { /* We're out of memory - give up. */ }
            }
            delete stream;
        }
    }

What happens:

/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_audio_tomahawk/tomahawk/work/tomahawk-0.8.4/src/tomahawk/mac/TomahawkApp_Mac.mm:163:25: warning: multi-character character constant [-Wmultichar]
  163 |           forEventClass:'WWW!'
      |                         ^~~~~~
/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_audio_tomahawk/tomahawk/work/tomahawk-0.8.4/src/tomahawk/mac/TomahawkApp_Mac.mm:164:25: warning: multi-character character constant [-Wmultichar]
  164 |              andEventID:'OURL'];
      |                         ^~~~~~
during GIMPLE pass: eh
In file included from /opt/local/libexec/qt4/include/QtNetwork/qabstractsocket.h:48,
                 from /opt/local/libexec/qt4/include/QtNetwork/qhostaddress.h:4,
                 from /opt/local/libexec/qt4/include/QtNetwork/qnetworkproxy.h:45,
                 from /opt/local/libexec/qt4/include/QtNetwork/QNetworkProxy:1,
                 from /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_audio_tomahawk/tomahawk/work/tomahawk-0.8.4/src/libtomahawk/utils/TomahawkUtils.h:28,
                 from /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_audio_tomahawk/tomahawk/work/tomahawk-0.8.4/src/libtomahawk/Result.h:28,
                 from /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_audio_tomahawk/tomahawk/work/tomahawk-0.8.4/src/tomahawk/./TomahawkWindow.h:25,
                 from /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_audio_tomahawk/tomahawk/work/tomahawk-0.8.4/src/tomahawk/mac/TomahawkApp_Mac.mm:24:
/opt/local/libexec/qt4/include/QtCore/qdebug.h: In destructor 'QDebug::~QDebug(':
/opt/local/libexec/qt4/include/QtCore/qdebug.h:81:12: internal compiler error: in objc_eh_runtime_type, at objc/objc-next-runtime-abi-01.cc:2798
   81 |     inline ~QDebug() {
      |            ^
Please submit a full bug report, with preprocessed source (by using -freport-bug).

Is there something wrong with Qt4 code here or is it actually a bug in GCC?