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Compilers that support 128-bit integer types usually don't have support for 128-bit literals, so provide Q_(U)INT128_C macros and back them with UDLs. This, of course, only works in C++, so until compilers provide built-in literals that support C, too, that's all we get. [ChangeLog][QtCore] Added Q_INT128_C() and Q_UINT128_C() macros to create qint128 and quint128 literals in a platform-independent way. Pick-to: 6.6.0 Fixes: QTBUG-116822 Change-Id: I4be645baf2e007ee1aa1a27f9b5166671806dc49 Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io> Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org> Reviewed-by: Thiago Macieira <thiago.macieira@intel.com> (cherry picked from commit 16433a4a6ed22750adfdb9633149c3bd485c4656) Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>