Currently, in sdcc, char is signed char by default. I would like to change this to unsigned char.
The current --funsigned-char would be replaced by a --fsigned char switch to get the non-default behaviour. char being unsigned char by default has advantages: People compare chars. For many architectures, unsigned comparisons are more efficient than unsigned comparisons. People cast chars to ints (many standard functions int arguments for characters). Casts from unsigned char to int are muh more efficient than signed char to int (the latter needs sign extension, the former doesn't). The C standard states that char should be either signed char or unsigned char. Philipp
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