Building QtBase MinGW developer build fails with qrhigles2

agent:2020/10/12 06:18:14 build.go:379: /Users/qt/work/qt/qtbase/src/gui/rhi/qrhigles2.cpp: In member function 'void QRhiGles2::executeCommandBuffer(QRhiCommandBuffer*)':
agent:2020/10/12 06:18:14 build.go:379: /Users/qt/work/qt/qtbase/src/gui/rhi/qrhigles2.cpp:2215:25: error: 'lastBindVertexBuffer.QRhiGles2::executeCommandBuffer(QRhiCommandBuffer*)::<unnamed struct>::binding' may be used uninitialized in this function [-Werror=maybe-uninitialized]
agent:2020/10/12 06:18:14 build.go:379: if (lastBindVertexBuffer.ps == psD
agent:2020/10/12 06:18:14 build.go:379: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
agent:2020/10/12 06:18:14 build.go:379: && lastBindVertexBuffer.buffer == cmd.args.bindVertexBuffer.buffer
agent:2020/10/12 06:18:14 build.go:379: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
agent:2020/10/12 06:18:14 build.go:379: && lastBindVertexBuffer.offset == cmd.args.bindVertexBuffer.offset
agent:2020/10/12 06:18:14 build.go:379: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
agent:2020/10/12 06:18:14 build.go:379: && lastBindVertexBuffer.binding == cmd.args.bindVertexBuffer.binding)
agent:2020/10/12 06:18:14 build.go:379: ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
agent:2020/10/12 06:18:14 build.go:379: cc1plus.exe: all warnings being treated as errors
agent:2020/10/12 06:18:28 build.go:379: ninja: build stopped: subcommand failed.