(SafeRenderer) Build fails on Fedora 30 and Qt5.12.0 and Qt5.13.0

Checked out qtsaferenderer 1.1 version, ran qmake from Qt5.12.0 (and Qt5.13.0) from binary distribution, make and almost immediately build failed in compiler error:

[jani@jani-t470p qtsaferenderer_fix_QSR-362]$ git checkout 1.1
Branch '1.1' set up to track remote branch '1.1' from 'origin'.
Switched to a new branch '1.1'
[jani@jani-t470p qtsaferenderer_fix_QSR-362]$ ~/Qt/5.12.0/gcc_64/bin/qmake
[jani@jani-t470p qtsaferenderer_fix_QSR-362]$ make
cd src/ && ( test -e Makefile || /home/jani/Qt/5.12.0/gcc_64/bin/qmake -o Makefile /home/jani/qtsaferenderer_fix_QSR-362/src/src.pro ) && make -f Makefile
make[1]: Entering directory '/home/jani/qtsaferenderer_fix_QSR-362/src'
cd qtsaferendererplugin/ && ( test -e Makefile || /home/jani/Qt/5.12.0/gcc_64/bin/qmake -o Makefile /home/jani/qtsaferenderer_fix_QSR-362/src/qtsaferendererplugin/qtsaferendererplugin.pro ) && make -f Makefile
make[2]: Entering directory '/home/jani/qtsaferenderer_fix_QSR-362/src/qtsaferendererplugin'
/home/jani/Qt/5.12.0/gcc_64/bin/qmake -install qinstall qmldir ../../qml/Qt/SafeRenderer/qmldir
/home/jani/Qt/5.12.0/gcc_64/bin/qmake -install qinstall plugins.qmltypes ../../qml/Qt/SafeRenderer/plugins.qmltypes
g++ -c -pipe -O2 -g -std=c+1y -fvisibility=hidden -fvisibility-inlines-hidden -Wall -W -Wvla -Wdate-time -Werror -Wno-error=cpp -Wno-error=deprecated-declarations -Wno-error=strict-overflow -fno-exceptions -D_REENTRANT -fPIC -DQT_NO_NARROWING_CONVERSIONS_IN_CONNECT -DQT_NO_EXCEPTIONS -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -DQT_NO_DEBUG -DQT_PLUGIN -DQT_QUICK_LIB -DQT_GUI_LIB -DQT_QML_LIB -DQT_NETWORK_LIB -DQT_CORE_LIB -I. -I../safecontentprovider -I../messagesenderplugin -I../saferenderer -I/home/jani/Qt/5.12.0/gcc_64/include/QtQuick/5.12.0 -I/home/jani/Qt/5.12.0/gcc_64/include/QtQuick/5.12.0/QtQuick -I/home/jani/Qt/5.12.0/gcc_64/include -I/home/jani/Qt/5.12.0/gcc_64/include/QtQuick -I/home/jani/Qt/5.12.0/gcc_64/include/QtGui/5.12.0 -I/home/jani/Qt/5.12.0/gcc_64/include/QtGui/5.12.0/QtGui -I/home/jani/Qt/5.12.0/gcc_64/include/QtGui -I/home/jani/Qt/5.12.0/gcc_64/include/QtQml/5.12.0 -I/home/jani/Qt/5.12.0/gcc_64/include/QtQml/5.12.0/QtQml -I/home/jani/Qt/5.12.0/gcc_64/include/QtQml -I/home/jani/Qt/5.12.0/gcc_64/include/QtNetwork -I/home/jani/Qt/5.12.0/gcc_64/include/QtCore/5.12.0 -I/home/jani/Qt/5.12.0/gcc_64/include/QtCore/5.12.0/QtCore -I/home/jani/Qt/5.12.0/gcc_64/include/QtCore -I.moc -isystem /usr/include/libdrm -I/home/jani/Qt/5.12.0/gcc_64/mkspecs/linux-g+ -o .obj/qsafetextprovider.o ../safecontentprovider/qsafetextprovider.cpp
In file included from /home/jani/Qt/5.12.0/gcc_64/include/QtCore/qlocale.h:43,
from /home/jani/Qt/5.12.0/gcc_64/include/QtCore/qtextstream.h:46,
from /home/jani/Qt/5.12.0/gcc_64/include/QtCore/qdebug.h:49,
from /home/jani/Qt/5.12.0/gcc_64/include/QtCore/QDebug:1,
from ../safecontentprovider/qsafetextprovider.cpp:30:
/home/jani/Qt/5.12.0/gcc_64/include/QtCore/qvariant.h: In constructor ‘QVariant::QVariant(QVariant&&)’:
/home/jani/Qt/5.12.0/gcc_64/include/QtCore/qvariant.h:273:25: error: implicitly-declared ‘constexpr QVariant::Private& QVariant::Private::operator=(const QVariant::Private&)’ is deprecated [-Werror=deprecated-copy]
273 | { other.d = Private(); }

^ /home/jani/Qt/5.12.0/gcc_64/include/QtCore/qvariant.h:399:16: note: because ‘QVariant::Private’ has user-provided ‘QVariant::Private::Private(const QVariant::Private&)’ 399

inline Private(const Private &other) Q_DECL_NOTHROW

^~~~~~~ cc1plus: all warnings being treated as errors make[2]: *** [Makefile:1190: .obj/qsafetextprovider.o] Error 1 make[2]: Leaving directory '/home/jani/qtsaferenderer_fix_QSR-362/src/qtsaferendererplugin' make[1]: *** [Makefile:48: sub-qtsaferendererplugin-make_first] Error 2 make[1]: Leaving directory '/home/jani/qtsaferenderer_fix_QSR-362/src' make: *** [Makefile:48: sub-src-make_first] Error 2 [jani@jani-t470p qtsaferenderer_fix_QSR-362]$ gcc --version gcc (GCC) 9.1.1 20190503 (Red Hat 9.1.1-1) Copyright (C) 2019 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

[jani@jani-t470p qtsaferenderer_fix_QSR-362]$

 Apparently a problem with Fedora's new compiler and its default warnings.