qdatetime.cpp in 6.2.0-beta1 does not compile with gcc 10.2.1

When trying to build Qt 6.2.0 Beta1 I'm running into compiler errors
( gcc (SUSE Linux) 10.2.1 20200825 [revision c0746a1beb1ba073c7981eb09f55b3d993b32e5c] ):

/disk3/qt/qt-everywhere-src-6.2.0-beta1/qtbase/src/corelib/time/qdatetime.cpp: In member function 'void QDateTime::setMSecsSinceEpoch(qint64)':
/disk3/qt/qt-everywhere-src-6.2.0-beta1/qtbase/src/corelib/time/qdatetime.cpp:4015:76: error: no matching function for call to 'add_overflow(qint64&, long int, qint64*)'
if (!add_overflow(msecs, d->m_offsetFromUtc * MSECS_PER_SEC, &msecs))
^
In file included from /disk3/qt/qt-everywhere-src-6.2.0-beta1/qtbase/include/QtCore/6.2.0/QtCore/private/qnumeric_p.h:1:0,
from /disk3/qt/qt-everywhere-src-6.2.0-beta1/qtbase/src/corelib/time/qdatetime.cpp:58:
/disk3/qt/qt-everywhere-src-6.2.0-beta1/qtbase/include/QtCore/6.2.0/QtCore/private/../../../../../src/corelib/global/qnumeric_p.h:234:35: note: candidate: template<class T> bool

{anonymous}::add_overflow(T, T, T*)
template <typename T> inline bool add_overflow(T v1, T v2, T *r) { return qAddOverflow(v1, v2, r); }
^~~~~~~~~~~~
/disk3/qt/qt-everywhere-src-6.2.0-beta1/qtbase/include/QtCore/6.2.0/QtCore/private/../../../../../src/corelib/global/qnumeric_p.h:234:35: note: template argument deduction/substitution failed:
/disk3/qt/qt-everywhere-src-6.2.0-beta1/qtbase/src/corelib/time/qdatetime.cpp:4015:76: note: deduced conflicting types for parameter 'T' ('long long int' and 'long int')
if (!add_overflow(msecs, d->m_offsetFromUtc * MSECS_PER_SEC, &msecs))
^
In file included from /disk3/qt/qt-everywhere-src-6.2.0-beta1/qtbase/include/QtCore/6.2.0/QtCore/private/qnumeric_p.h:1:0,
from /disk3/qt/qt-everywhere-src-6.2.0-beta1/qtbase/src/corelib/time/qdatetime.cpp:58:
/disk3/qt/qt-everywhere-src-6.2.0-beta1/qtbase/include/QtCore/6.2.0/QtCore/private/../../../../../src/corelib/global/qnumeric_p.h:238:34: note: candidate: template<class T, T V2> bool {anonymous}

::add_overflow(T, std::integral_constant<T, V2>, T*)
template <typename T, T V2> bool add_overflow(T v1, std::integral_constant<T, V2>, T *r)
^~~~~~~~~~~~
/disk3/qt/qt-everywhere-src-6.2.0-beta1/qtbase/include/QtCore/6.2.0/QtCore/private/../../../../../src/corelib/global/qnumeric_p.h:238:34: note: template argument deduction/substitution failed:
/disk3/qt/qt-everywhere-src-6.2.0-beta1/qtbase/src/corelib/time/qdatetime.cpp:4015:76: note: mismatched types 'std::integral_constant<T, V2>' and 'long int'
if (!add_overflow(msecs, d->m_offsetFromUtc * MSECS_PER_SEC, &msecs))
^
In file included from /disk3/qt/qt-everywhere-src-6.2.0-beta1/qtbase/include/QtCore/6.2.0/QtCore/private/qnumeric_p.h:1:0,
from /disk3/qt/qt-everywhere-src-6.2.0-beta1/qtbase/src/corelib/time/qdatetime.cpp:58:
/disk3/qt/qt-everywhere-src-6.2.0-beta1/qtbase/include/QtCore/6.2.0/QtCore/private/../../../../../src/corelib/global/qnumeric_p.h:243:37: note: candidate: template<auto V2, class T> bool

{anonymous}

::add_overflow(T, T*)
template <auto V2, typename T> bool add_overflow(T v1, T *r)
^~~~~~~~~~~~
/disk3/qt/qt-everywhere-src-6.2.0-beta1/qtbase/include/QtCore/6.2.0/QtCore/private/../../../../../src/corelib/global/qnumeric_p.h:243:37: note: template argument deduction/substitution failed:
/disk3/qt/qt-everywhere-src-6.2.0-beta1/qtbase/src/corelib/time/qdatetime.cpp:4015:76: note: mismatched types 'T*' and 'long int'
if (!add_overflow(msecs, d->m_offsetFromUtc * MSECS_PER_SEC, &msecs))
^
make[2]: *** [qtbase/src/tools/bootstrap/CMakeFiles/Bootstrap.dir/build.make:1056: qtbase/src/tools/bootstrap/CMakeFiles/Bootstrap.dir/__/__/corelib/time/qdatetime.cpp.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:6204: qtbase/src/tools/bootstrap/CMakeFiles/Bootstrap.dir/all] Error 2