qstringview test static assert failure on QNX 7

qcc -Vgcc_ntoarmv7le -c -mfpu=neon -Wno-psabi -lang-c++ -g -std=gnu++1z -Wall -W -D_REENTRANT -fPIC -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -DQT_TESTLIB_LIB -DQT_CORE_LIB -DQT_TESTCASE_BUILDDIR='"/home/sapiippo/development/build/qnxbuild/tests/auto/corelib/tools/qstringview"' -I/home/sapiippo/development/qt/qt5/qtbase/tests/auto/corelib/tools/qstringview -I. -I../../../../../include -I../../../../../include/QtTest -I../../../../../include/QtCore -I.moc -I/opt/qnx700/target/qnx7/usr/include -I/opt/qnx700/target/qnx7/usr/include/freetype2 -I/home/sapiippo/development/qt/qt5/qtbase/mkspecs/qnx-armle-v7-qcc -o .obj/tst_qstringview.o /home/sapiippo/development/qt/qt5/qtbase/tests/auto/corelib/tools/qstringview/tst_qstringview.cpp
In file included from ../../../../../include/QtCore/qglobal.h:1:0,
                 from ../../../../../include/QtCore/../../../../qt/qt5/qtbase/src/corelib/tools/qchar.h:43,
                 from ../../../../../include/QtCore/qchar.h:1,
                 from ../../../../../include/QtCore/../../../../qt/qt5/qtbase/src/corelib/tools/qstringview.h:46,
                 from ../../../../../include/QtCore/qstringview.h:1,
                 from ../../../../../include/QtCore/QStringView:1,
                 from /home/sapiippo/development/qt/qt5/qtbase/tests/auto/corelib/tools/qstringview/tst_qstringview.cpp:34:
../../../../../include/QtCore/../../../../qt/qt5/qtbase/src/corelib/global/qglobal.h:755:36: error: static assertion failed: CanConvert<QChar[123]>::value
 #define Q_STATIC_ASSERT(Condition) static_assert(bool(Condition), #Condition)
                                    ^
/home/sapiippo/development/qt/qt5/qtbase/tests/auto/corelib/tools/qstringview/tst_qstringview.cpp:61:1: note: in expansion of macro 'Q_STATIC_ASSERT'
 Q_STATIC_ASSERT(CanConvert<QChar[123]>::value);
 ^
../../../../../include/QtCore/../../../../qt/qt5/qtbase/src/corelib/global/qglobal.h:755:36: error: static assertion failed: CanConvert<ushort[123]>::value
 #define Q_STATIC_ASSERT(Condition) static_assert(bool(Condition), #Condition)
                                    ^
/home/sapiippo/development/qt/qt5/qtbase/tests/auto/corelib/tools/qstringview/tst_qstringview.cpp:80:1: note: in expansion of macro 'Q_STATIC_ASSERT'
 Q_STATIC_ASSERT(CanConvert<ushort[123]>::value);
 ^
cc: /opt/qnx700/host/linux/x86_64/usr/lib/gcc/arm-unknown-nto-qnx7.0.0eabi/5.4.0/cc1plus error 1
Makefile:1047: recipe for target '.obj/tst_qstringview.o' failed