The use of Space was still ambiguous. Says GCC 14: qsettings.cpp: In static member function ‘static bool QConfFileSettingsPrivate::readIniLine(QByteArrayView, qsizetype&, qsizetype&, qsizetype&, qsizetype&)’: qsettings.cpp:1564:82: error: reference to ‘Space’ is ambiguous 1564 | while (lineStart < dataLen && (charTraits[uint(uchar(data.at(lineStart)))] & Space)) | ^~~~~ In file included from unity_0_cxx.cxx:277: qjsonparser.cpp:217:5: note: candidates are: ‘<unnamed enum> Space’ 217 | Space = 0x20, | ^~~~~ qsettings.cpp:1523:8: note: ‘SettingsImpl::<unnamed enum> SettingsImpl::Space’ 1523 | enum { Space = 0x1, Special = 0x2 }; | ^~~~~ qsettings.cpp:1605:71: error: reference to ‘Space’ is ambiguous 1605 | while (i < dataLen && charTraits[uchar(data.at(i))] & Space) | ^~~~~ qjsonparser.cpp:217:5: note: candidates are: ‘<unnamed enum> Space’ 217 | Space = 0x20, | ^~~~~ qsettings.cpp:1523:8: note: ‘SettingsImpl::<unnamed enum> SettingsImpl::Space’ 1523 | enum { Space = 0x1, Special = 0x2 }; | ^~~~~ Fix by making Space and Special local aliases (contexpr variables) instead of importing the whole SettingsImpl namespace. Amends 4ff65f0e5615b1132ec13c6eeba3647162d8dd0f. Pick-to: 6.9 6.8 6.5 Change-Id: I9e8f2422885121fb02938261fbae6231e62ae46d Reviewed-by: Thiago Macieira <thiago.macieira@intel.com> Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>