MinGW/gcc 6.2: signed integer overflow in qdebug.h

configure -static -debug-and-release -platform win32-g++ \
-developer-build -c++std c++11 -prefix \
"e:\Qt\5.8\x86_64_w64_minigw32_posix_6.3.0_static" \
-opensource -confirm-license -icu -nomake examples -nomake tests \
-make tools -qml-debug -opengl desktop -system-proxies -make libs \
-qt-pcre -qt-libpng  -qt-libjpeg -qt-zlib -qt-freetype -qt-sql-sqlite \
-qt-sql-odbc -qt-sql-mysql -openssl -openssl-linked \
OPENSSL_LIBS="-luser32 -ladvapi32" \
OPENSSL_LIBS_RELEASE="-llibcrypto \
-llibssl" OPENSSL_LIBS_DEBUG="-llibcryptod -llibssld" -l libmysql \
-I "c:\Lib\include\mysql" -I "d:\Qt\Tools\MinGW\mingw64-x86_64-6.2.0-release-posix-seh-rt_v5-rev1\include" \
-I "d:\Qt\Tools\MinGW\mingw64-x86_64-6.2.0-release-posix-seh-rt_v5-rev1\x86_64-w64-mingw32\include" \
-I "d:\Qt\Tools\MinGW\mingw64-x86_64-6.3.0-release-posix-seh-rt_v5-rev1\opt\include" \
-I "c:\usr\openssl-x64-mingw64\include" \
-I "c:\usr\openssl-x64-mingw64\include\openssl" -I "d:\opensource\icu\icu_static_release\include" \
-L "d:\Qt\Tools\MinGW\mingw64-x86_64-6.3.0-release-posix-seh-rt_v5-rev1\lib" \
-L "d:\Qt\Tools\MinGW\mingw64-x86_64-6.3.0-release-posix-seh-rt_v5-rev1\x86_64-w64-mingw32\lib" \
-L "d:\Qt\Tools\MinGW\mingw64-x86_64-6.2.0-release-posix-seh-rt_v5-rev1\opt\lib" \
-L "c:\usr\openssl-x64-mingw64\lib" \
-L "d:\opensource\icu\icu_static_release\lib" \
-L "c:\Lib\lib64_VS2015\MySQL"

gcc -c -pipe -fno-keep-inline-dllexport -O2 -w -DUNICODE -DPCRE_STATIC -DHAVE_CONFIG_H -DQT_NO_DYNAMIC_CAST -DQT_NO_EXCEPT
IONS -I. -I. -Ic:/Lib/include/mysql -Id:/Qt/Tools/MinGW/mingw64-x86_64-6.2.0-release-posix-seh-rt_v5-rev1/include -Id:/Qt/
Tools/MinGW/mingw64-x86_64-6.2.0-release-posix-seh-rt_v5-rev1/x86_64-w64-mingw32/include -Id:/Qt/Tools/MinGW/mingw64-x86_6
4-6.3.0-release-posix-seh-rt_v5-rev1/opt/include -Ic:/usr/openssl-x64-mingw64/include -Ic:/usr/openssl-x64-mingw64/include
/openssl -Id:/opensource/icu/icu_static_release/include -I../../../mkspecs/win32-g++  -o .obj/release/pcre16_xclass.o pcre
16_xclass.c
In file included from ../../../include/QtCore/qdebug.h:1:0,
                 from ../../corelib/global/qlogging.cpp:47:
../../../include/QtCore/../../src/corelib/io/qdebug.h: In member function 'void QDebug::Stream::setVerbosity(int)':
../../../include/QtCore/../../src/corelib/io/qdebug.h:99:42: error: result of '(7 << 29)' requires 33 bits to represent, b
ut 'int' only has 32 bits [-Werror=shift-overflow=]
                 flags &= ~(VerbosityMask << VerbosityShift);
                            ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~
cc1plus.exe: all warnings being treated as errors
Makefile.Release:1519: recipe for target '.obj/release/qlogging.o' failed
mingw32-make[4]: *** [.obj/release/qlogging.o] Error 1
mingw32-make[4]: Leaving directory 'D:/Qt/Build/Src_mingw_posix_static/qtbase/src/tools/bootstrap'
Makefile:34: recipe for target 'release' failed
mingw32-make[3]: *** [release] Error 2
mingw32-make[3]: Leaving directory 'D:/Qt/Build/Src_mingw_posix_static/qtbase/src/tools/bootstrap'
Makefile:91: recipe for target 'sub-bootstrap-make_first' failed
mingw32-make[2]: *** [sub-bootstrap-make_first] Error 2
mingw32-make[2]: *** Waiting for unfinished jobs....
ar -M < object_script.libqtpcre.Release
mingw32-make[4]: Leaving directory 'D:/Qt/Build/Src_mingw_posix_static/qtbase/src/3rdparty/pcre'
mingw32-make[3]: Leaving directory 'D:/Qt/Build/Src_mingw_posix_static/qtbase/src/3rdparty/pcre'
mingw32-make[2]: Leaving directory 'D:/Qt/Build/Src_mingw_posix_static/qtbase/src'
Makefile:42: recipe for target 'sub-src-make_first' failed
mingw32-make[1]: *** [sub-src-make_first] Error 2
mingw32-make[1]: Leaving directory 'D:/Qt/Build/Src_mingw_posix_static/qtbase'
Makefile:75: recipe for target 'module-qtbase-make_first' failed
mingw32-make: *** [module-qtbase-make_first] Error 2