Improve compilation

[eltang]

• Copy a change made in TMK that somehow didn’t make it (remove extraneous dfu-programmer commands)
• Make code size estimates much more meaningful

[jackhumbert]

The move to testing .hex files was a conscious one, and -C isn't available on all versions of avr-size.

What dfu-programmer commands are you talking about?

[eltang]

avr-size strips down the .elf file to what's actually going to go on the chip. The number in the new output is exactly the same as the number in the old output; the only difference is that the size is now also given as a percentage of the space available on the chip (much more useful). Should I change -C to --format=avr?

I'm talking about tmk/tmk_keyboard@d0f1749.

[jackhumbert]

It does the same to the .hex file. The avr format is also not supported by all versions.

I'd like to keep the size information, but I see the redundant erase - feel free to modify your PR to just that.

[eltang]

Done.

[eltang]

I think some documentation on running avr-size manually would be nice (it took me a while to figure that one out).

[jackhumbert]

Putting -h after the command usually provides enough. eg avr-size -h.

[eltang]

That's not what I meant; learning all the options is easy, but learning that it even exists (and how to make it produce much cleaner output than it does when called by make) is not.