qtdeclarative/src/qml/compiler/qv4codegen_p.h build failure in qt5

agent:2018/10/08 13:28:32 build.go:193: g++ -c -include .pch/Qt5QmlTestInfix -pipe -Wno-expansion-to-defined -Wno-c++0x-compat -O2 -std=c++1z -fvisibility=hidden -fvisibility-inlines-hidden -fno-exceptions -Wall -W -Wno-expansion-to-defined -Wvla -Wdate-time -Wshift-overflow=2 -Wduplicated-cond -Wno-stringop-overflow -Werror -Wno-error=cpp -Wno-error=deprecated-declarations -Wno-error=strict-overflow -Wno-error=implicit-fallthrough -D_REENTRANT -fPIC -DQT_NO_URL_CAST_FROM_STRING -DQT_NO_INTEGER_EVENT_COORDINATES -DQT_NO_FOREACH -DWTF_EXPORT_PRIVATE= -DJS_EXPORT_PRIVATE= -DENABLE_ASSEMBLER_WX_EXCLUSIVE=1 -DWTFReportAssertionFailure=qmlWTFReportAssertionFailure -DWTFReportAssertionFailureWithMessage=qmlWTFReportAssertionFailureWithMessage -DWTFReportBacktrace=qmlWTFReportBacktrace -DWTFInvokeCrashHook=qmlWTFInvokeCrashHook -DENABLE_LLINT=0 -DENABLE_DFG_JIT=0 -DENABLE_DFG_JIT_UTILITY_METHODS=1 -DENABLE_JIT_CONSTANT_BLINDING=0 -DBUILDING_QT__ -DWTF_USE_UDIS86=0 -DNDEBUG -DQT_NO_NARROWING_CONVERSIONS_IN_CONNECT -DQT_BUILD_QML_LIB -DQT_BUILDING_QT -DQT_NO_CAST_TO_ASCII -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 -DQT_NETWORK_LIB -DQT_CORE_LIB -DQT_NAMESPACE=TestNamespace -I/home/qt/work/qt/qt5/qtdeclarative/src/qml -I. -I/home/qt/work/qt/qt5/qtdeclarative/src/qml/memory -I. -I/home/qt/work/qt/qt5/qtdeclarative/src/qml/compiler -I. -I/home/qt/work/qt/qt5/qtdeclarative/src/qml/jsruntime -I. -I/home/qt/work/qt/qt5/qtdeclarative/src/qml/jit -I. -I/home/qt/work/qt/qt5/qtdeclarative/src/qml/debugger -I/home/qt/work/qt/qt5/qtdeclarative/src/qml/animations -I/home/qt/work/qt/qt5/qtdeclarative/src/3rdparty/masm/jit -I/home/qt/work/qt/qt5/qtdeclarative/src/3rdparty/masm/assembler -I/home/qt/work/qt/qt5/qtdeclarative/src/3rdparty/masm/runtime -I/home/qt/work/qt/qt5/qtdeclarative/src/3rdparty/masm/wtf -I/home/qt/work/qt/qt5/qtdeclarative/src/3rdparty/masm/stubs -I/home/qt/work/qt/qt5/qtdeclarative/src/3rdparty/masm/stubs/runtime -I/home/qt/work/qt/qt5/qtdeclarative/src/3rdparty/masm/stubs/wtf -I/home/qt/work/qt/qt5/qtdeclarative/src/3rdparty/masm -I/home/qt/work/qt/qt5/qtdeclarative/src/3rdparty/masm/disassembler -I/home/qt/work/qt/qt5/qtdeclarative/src/3rdparty/masm/disassembler/udis86 -I.generated -I/home/qt/work/build/qtbase/include -I/home/qt/work/build/qtbase/include/QtQml -I/home/qt/work/build/qtbase/include/QtQml/5.12.0 -I/home/qt/work/build/qtbase/include/QtQml/5.12.0/QtQml -I. -I/home/qt/work/build/qtbase/include/QtCore/5.12.0 -I/home/qt/work/build/qtbase/include/QtCore/5.12.0/QtCore -I/home/qt/work/build/qtbase/include/QtNetwork -I/home/qt/work/build/qtbase/include/QtCore -I.moc -I/home/qt/work/qt/qt5/qtbase/mkspecs/linux-g++ -o .obj/qv4bytecodehandler.o /home/qt/work/qt/qt5/qtdeclarative/src/qml/compiler/qv4bytecodehandler.cpp
agent:2018/10/08 13:28:34 build.go:193: In file included from /home/qt/work/qt/qt5/qtdeclarative/src/qml/compiler/qv4codegen.cpp:40:
agent:2018/10/08 13:28:34 build.go:193: /home/qt/work/qt/qt5/qtdeclarative/src/qml/compiler/qv4codegen_p.h: In member function ‘TestNamespace::QV4::Compiler::Codegen::Reference TestNamespace::QV4::Compiler::Codegen::expression(TestNamespace::QQmlJS::AST::ExpressionNode*)’:
agent:2018/10/08 13:28:34 build.go:193: /home/qt/work/qt/qt5/qtdeclarative/src/qml/compiler/qv4codegen_p.h:175:12: error: ‘r.TestNamespace::QV4::Compiler::Codegen::Reference::<anonymous>’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
agent:2018/10/08 13:28:34 build.go:193:      struct Reference {
agent:2018/10/08 13:28:34 build.go:193:             ^~~~~~~~~
agent:2018/10/08 13:28:34 build.go:193: /home/qt/work/qt/qt5/qtdeclarative/src/qml/compiler/qv4codegen_p.h:175:12: error: ‘r.TestNamespace::QV4::Compiler::Codegen::Reference::<anonymous>’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
agent:2018/10/08 13:28:34 build.go:193:      struct Reference {
agent:2018/10/08 13:28:34 build.go:193:             ^~~~~~~~~
agent:2018/10/08 13:28:35 build.go:193: /home/qt/work/qt/qt5/qtdeclarative/src/qml/compiler/qv4codegen_p.h: In member function ‘void TestNamespace::QV4::Compiler::Codegen::condition(TestNamespace::QQmlJS::AST::ExpressionNode*, const TestNamespace::QV4::Moth::BytecodeGenerator::Label*, const TestNamespace::QV4::Moth::BytecodeGenerator::Label*, bool)’:
agent:2018/10/08 13:28:35 build.go:193: /home/qt/work/qt/qt5/qtdeclarative/src/qml/compiler/qv4codegen_p.h:175:12: error: ‘r.TestNamespace::QV4::Compiler::Codegen::Reference::<anonymous>’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
agent:2018/10/08 13:28:35 build.go:193:      struct Reference {
agent:2018/10/08 13:28:35 build.go:193:             ^~~~~~~~~