qemu/hw/char/exynos4210_uart.c: possible pointless local variable ? $ fgrep frame_size qemu/hw/char/exynos4210_uart.c int speed, parity, data_bits, stop_bits, frame_size; frame_size = 1; /* start bit */ frame_size++; /* parity bit */ frame_size += data_bits + stop_bits; $ Suggest either use it or delete it. Thanks for the report -- patch sent to mailing list which deletes the variable. Now fixed in git master, commit e62694a078f182.