[Bug c++/120955] [15/16 Regression] 50 % increase in data segment size on avr-gcc for -Os

[fiesh at zefix dot tv via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120955

--- Comment #13 from fiesh at zefix dot tv ---
I should mention that it's key to use `avr-size -G` to get meaningful data
sizes for objects.  The default Berkeley style gives very small data sizes for
objects.  No clue why, and I can't find reasoning for this in size's man page
either.