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Clang complains about left shifting a negative value being undefined. EmbeddedPkg/Library/GdbSerialLib/GdbSerialLib.c:151:30: error: shifting a negative signed value is undefined [-Werror,-Wshift-negative-value] OutputData = (UINT8)((~DLAB<<7)|((BreakSet<<6)|((Parity<<3)|((StopBits<<2)| Data)))); Redefine all bit pattern constants as unsigned to work around this. Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>