Comparing build sizes

There is a make target for build size comparison. You can use it like that:

$ cd RIOT/test/test_something

$ git checkout master
$ make buildtest BINDIRBASE=master-bin

$ git checkout my-branch
$ make buildtest BINDIRBASE=my-branch-bin

$ make info-buildsizes-diff OLDBIN=master-bin NEWBIN=my-branch-bin
text    data    bss     dec     BOARD/BINDIRBASE

0       0       0       0       avsextrem    **← this line contains the diff**
57356   1532    96769   155657  master-bin
57356   1532    96769   155657  my-branch-bin

...

Note: make info-buildsizes-diff needs bash 4, so your system must not be older than 20-Feb-2009 …

Check it out, the output contains colors. ;)

(This page is mostly a copy of René Kijewski's explanation in https://github.com/RIOT-OS/RIOT/pull/1033.)