When you call printf("foo\n") that gets optimized to puts("foo") so you're
not really calling printf at all.
Try comparing printf("foo: %d\n", 42)';
On Sat, Apr 15, 2017 at 4:39 PM, Britton Kerin <[email protected]>
wrote:
> The documentation seems to be saying that using those flags is
> supposed to save flash, but without them, a main() that does a single
> printf("foo\n"); gives me a 330 byte flash, while with them I get a
> 1330 byte flash.
>
> If I remove the printf() call, I get flash sizes of 1228 or 228 with
> or without the above mentioned printf-min flags, respectively.
>
> It looks like somehow the printf-min flag ends up dragging in a bunch
> extra code somehow?
>
> The rest of my linker invocation looks like this:
>
> avr-gcc -mmcu=atmega328p -lm -Wl,-gc-sections
> -Wl,-Map=program_to_upload.out.map -o program_to_upload.out main.o
>
> I think probably the documentation ought to mention this possibility,
> assuming it isn't a bug.
>
>
> Britton
>
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--
Dave Hylands
Shuswap, BC, Canada
http://www.davehylands.com
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