global/qrandom.cpp:420:50: error: the type 'const QRandomGenerator::SystemAndGlobalGenerators' of constexpr variable 'g' is not literal

...
global/qrandom.cpp: In member function 'void QRandomGenerator::SystemAndGlobalGenerators::confirmLiteral()':
global/qrandom.cpp:420:50: error: the type 'const QRandomGenerator::SystemAndGlobalGenerators' of constexpr variable 'g' is not literal
         constexpr SystemAndGlobalGenerators g = {};
                                                  ^
global/qrandom.cpp:387:26: note: 'QRandomGenerator::SystemAndGlobalGenerators' is not literal because:
 struct QRandomGenerator::SystemAndGlobalGenerators
                          ^
global/qrandom.cpp:401:17: note:   non-static data member 'QRandomGenerator::SystemAndGlobalGenerators::globalPRNGMutex' has non-literal type
     QBasicMutex globalPRNGMutex;
                 ^
In file included from ../../include/QtCore/qmutex.h:1:0,
                 from global/qrandom.cpp:46:
../../include/QtCore/../../src/corelib/thread/qmutex.h:67:21: note: 'QBasicMutex' is not literal because:
 class Q_CORE_EXPORT QBasicMutex
                     ^
../../include/QtCore/../../src/corelib/thread/qmutex.h:67:21: note:   'QBasicMutex' is not an aggregate, does not have a trivial default constructor, and has no constexpr constructor that is not a copy or move constructor
../../include/QtCore/../../src/corelib/thread/qmutex.h:67:21: note: 'QBasicMutex::QBasicMutex()' is not usable as a constexpr function because:
In file included from ../../include/QtCore/qbasicatomic.h:1:0,
                 from ../../include/QtCore/../../src/corelib/thread/qatomic.h:46,
                 from ../../include/QtCore/qatomic.h:1,
                 from global/qglobal.h:1179,
                 from global/qt_pch.h:56:
../../include/QtCore/../../src/corelib/thread/qbasicatomic.h:315:5: note: defaulted constructor calls non-constexpr 'QBasicAtomicPointer<X>::QBasicAtomicPointer() [with X = QMutexData]'
     QBasicAtomicPointer() = default;
     ^
In file included from global/qt_pch.h:56:0:
global/qglobal.h:755:36: error: static assertion failed: std::is_literal_type<SystemAndGlobalGenerators>::value
 #define Q_STATIC_ASSERT(Condition) static_assert(bool(Condition), #Condition)
                                    ^
global/qrandom.cpp:422:9: note: in expansion of macro 'Q_STATIC_ASSERT'
         Q_STATIC_ASSERT(std::is_literal_type<SystemAndGlobalGenerators>::value);
         ^
cc: /opt/qnx700/host/linux/x86_64/usr/lib/gcc/i586-pc-nto-qnx7.0.0/5.4.0/cc1plus error 1
Makefile:12002: recipe for target '.obj/qrandom.o' failed
make[2]: *** [.obj/qrandom.o] Error 1
make[2]: *** Waiting for unfinished jobs....
make[2]: Leaving directory '/home/qt/work/qt/qtbase/src/corelib'
Makefile:224: recipe for target 'sub-corelib-make_first' failed
make[1]: *** [sub-corelib-make_first] Error 2
make[1]: *** Waiting for unfinished jobs....
g++ -Wl,--gc-sections -Wl,-O1 -o ../../../bin/qdbuscpp2xml .obj/moc.o .obj/preprocessor.o .obj/generator.o .obj/parser.o .obj/token.o .obj/qdbuscpp2xml.o   -L/home/qt/work/qt/qtbase/lib -lQt5BootstrapDBus -lQt5Bootstrap -lpthread 
make[2]: Leaving directory '/home/qt/work/qt/qtbase/src/tools/qdbuscpp2xml'
make[1]: Leaving directory '/home/qt/work/qt/qtbase/src'
Makefile:48: recipe for target 'sub-src-make_first' failed
make: *** [sub-src-make_first] Error 2
...

...
"global/qrandom.cpp", line 420: error #1982-D: target stack alignment is
          insufficient to guarantee alignment of variable "g"
          constexpr SystemAndGlobalGenerators g = {};
                                              ^

"global/qrandom.cpp", line 420: error #3026: a constexpr variable must have a
          literal type or a reference type
          constexpr SystemAndGlobalGenerators g = {};
          ^

"global/qrandom.cpp", line 422: error #1489: static assertion failed with
          "std::is_literal_type<SystemAndGlobalGenerators>::value"
          Q_STATIC_ASSERT(std::is_literal_type<SystemAndGlobalGenerators>::value);
          ^

Makefile:11062: recipe for target '.obj/qrandom.o' failed
make[2]: *** [.obj/qrandom.o] Error 1
make[2]: *** Waiting for unfinished jobs....
make[2]: Leaving directory '/home/qt/work/qt/qtbase/src/corelib'
Makefile:226: recipe for target 'sub-corelib-make_first' failed
make[1]: *** [sub-corelib-make_first] Error 2
make[1]: Leaving directory '/home/qt/work/qt/qtbase/src'
Makefile:48: recipe for target 'sub-src-make_first' failed
make: *** [sub-src-make_first] Error 2
...