PyQt6 build issues with GCC 16, related to operator!=

[Dmitry Shachnev]

Hi Phil!

With GCC 16.1 in Debian unstable, PyQt6 6.11.0 fails to build with this error:

    QtCore/sipQtCorecmodule.cpp: In function ‘PyObject* slot_QLocale_Language___ne__(PyObject*, PyObject*)’:
    QtCore/sipQtCorecmodule.cpp:8393:32: error: no matching function for call to ‘operator!=(QLocale::Language&, const QLocale&)’
     8393 |             sipRes = operator!=(sipCpp, *a0);
          |                      ~~~~~~~~~~^~~~~~~~~~~~~
      * there are 2 candidates
    In file included from /usr/include/x86_64-linux-gnu/qt6/QtCore/qcborvalue.h:9:
        * candidate 1: ‘bool operator!=(QCborTag, QCborKnownTags)’
          /usr/include/x86_64-linux-gnu/qt6/QtCore/qcborcommon.h:65:13:
             65 | inline bool operator!=(QCborTag t, QCborKnownTags kt)   { return quint64(t) != quint64(kt); }
                |             ^~~~~~~~
          * no known conversion for argument 1 from ‘QLocale::Language’ to ‘QCborTag’
            /usr/include/x86_64-linux-gnu/qt6/QtCore/qcborcommon.h:65:33:
               65 | inline bool operator!=(QCborTag t, QCborKnownTags kt)   { return quint64(t) != quint64(kt); }
                  |                        ~~~~~~~~~^
        * candidate 2: ‘bool operator!=(QCborKnownTags, QCborTag)’
          /usr/include/x86_64-linux-gnu/qt6/QtCore/qcborcommon.h:66:13:
             66 | inline bool operator!=(QCborKnownTags kt, QCborTag t)   { return quint64(t) != quint64(kt); }
                |             ^~~~~~~~
          * no known conversion for argument 1 from ‘QLocale::Language’ to ‘QCborKnownTags’
            /usr/include/x86_64-linux-gnu/qt6/QtCore/qcborcommon.h:66:39:
               66 | inline bool operator!=(QCborKnownTags kt, QCborTag t)   { return quint64(t) != quint64(kt); }
                  |                        ~~~~~~~~~~~~~~~^~

PyQt6-WebEngine 6.11.0 also fails to build with a similar error:

    QtWebEngineCore/sipQtWebEngineCoreQWebEngineFrame.cpp: In function 'PyObject* slot_QWebEngineFrame___ne__(PyObject*, PyObject*)':
    QtWebEngineCore/sipQtWebEngineCoreQWebEngineFrame.cpp:458:22: error: 'operator!=' not defined
      458 |             sipRes = operator!=((*sipCpp), *a0);
          |                      ^~~~~~~~~~

This happens with SIP v6.15.3 and v6.16.0, with Python 3.13 and 3.14.
Our Qt version is 6.10.2 at the moment.

I attached the generated sipQtCorecmodule.cpp for PyQt6, and I can provide any
additional information if you need it.

--
Dmitry Shachnev
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