>  There really doesn't seem to be much of a point; GCC's AVR support is
>very good these days.

True, however sad it may be.

SDCC certainly has potential to support 8-bitters much better than gcc, but
it's unlikely anybody will invest into the avr branch now - it's easier to
learn to live with the limitations of avr-gcc.

2 or 3 years ago, as an exercise in understanding big projects as SDCC is,
I got the AVR branch generate actual code assemblable with gas. It took me
like a week of full-time work (actually more like two weeks, but I also
had other things to do).

It was far, far from being optimal or even approach the quality of
avr-gcc-generated code, not to mention that it worked only for a
well-selected range of functions (read, the backend is buggy beyond my
capabilities to repair it - and it really needs re-creation rather than
repair).
 
JW



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