-Wdate-time incorrectly applied to host compiler

make[3]: Entering directory `/tmp/e2/build/build/qtbase/src/tools/bootstrap'
g++ -c -O2 -pipe -ffunction-sections -O2 -fPIC -std=c++11 -fno-exceptions -Wall -W -Wvla -Wdate-time -D_REENTRANT -DQT_NO_MTDEV -DQT_NO_LIBINPUT -DQT_BOOTSTRAPPED -DQT_LITE_UNICODE -DQT_NO_CAST_TO_ASCII -DQT_NO_CODECS -DQT_NO_DATASTREAM -DQT_NO_LIBRARY -DQT_NO_QOBJECT -DQT_NO_SYSTEMLOCALE -DQT_NO_THREAD -DQT_NO_UNICODETABLES -DQT_NO_USING_NAMESPACE -DQT_NO_DEPRECATED -DQT_NO_TRANSLATION -DQT_CRYPTOGRAPHICHASH_ONLY_SHA1 -DQT_NO_CAST_FROM_ASCII -DQT_BUILD_BOOTSTRAP_LIB -DQT_BUILDING_QT -DQT_ASCII_CAST_WARNINGS -DQT_MOC_COMPAT -DQT_USE_QSTRINGBUILDER -DQT_DEPRECATED_WARNINGS -DQT_DISABLE_DEPRECATED_BEFORE=0x050000 -DQT_NO_EXCEPTIONS -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -DQT_NO_DEBUG -I/tmp/e2/build/qt-everywhere-opensource-src-5.7.0-beta/qtbase/src/tools/bootstrap -I. -I/tmp/e2/build/qt-everywhere-opensource-src-5.7.0-beta/qtbase/src/3rdparty/zlib -I/tmp/e2/build/qt-everywhere-opensource-src-5.7.0-beta/qtbase/include -I/tmp/e2/build/qt-everywhere-opensource-src-5.7.0-beta/qtbase/include/QtCore -I/tmp/e2/build/qt-everywhere-opensource-src-5.7.0-beta/qtbase/include/QtCore/5.7.0 -I/tmp/e2/build/qt-everywhere-opensource-src-5.7.0-beta/qtbase/include/QtCore/5.7.0/QtCore -I/tmp/e2/build/qt-everywhere-opensource-src-5.7.0-beta/qtbase/include/QtXml -I/tmp/e2/build/qt-everywhere-opensource-src-5.7.0-beta/qtbase/include/QtXml/5.7.0 -I/tmp/e2/build/qt-everywhere-opensource-src-5.7.0-beta/qtbase/include/QtXml/5.7.0/QtXml -I../../../include -I../../../include/QtCore -I/tmp/e2/build/build/qtbase/include/QtXml -I/tmp/e2/build/qt-everywhere-opensource-src-5.7.0-beta/qtbase/mkspecs/linux-g++ -o .obj/qlatincodec.o /tmp/e2/build/qt-everywhere-opensource-src-5.7.0-beta/qtbase/src/corelib/codecs/qlatincodec.cpp
g++: error: unrecognized command line option '-Wdate-time'