This is in preparation of adding some static assertions here that we
need to have evaluated in both "normal" and "strict" mode, namely
<type_traits> and <limits> support for qint128.
But this change is more general, so making it a separate change.
Turns out we already have (non-static) assertions here about <limits>
support for qint128. These force us to define precisely when
GCC/libstdc++ has gained <limits> support for __int128_t: the
timestamp of the __GLIBCXX__ macro is the Daily Bump immediately
preceding the gcc commit that fixed <limits>
(gcc/8eb9a45e87bdb81cb44948c651edee846c622a0f).
Let's hope no-one is running the prerelease version of GCC 10.3 from
that particular day, otherwise these might become XPASSes. But just
not testing is also wrong; we want to be informed about True Positives
and Negatives here.
Task-number: QTBUG-119901
Pick-to: 6.7 6.5
Change-Id: I6f9be047f846fff74133c466c5bed40d0039d60f
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
(cherry picked from commit e7c54248987d474cff9f49cad502822eb9dcb114)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
caf57f0ca3