I use it too for embedded. Functions get inlined, fewer registers get saved unnecessarily in functions. I also use “-fdata-sections -ffunction-sections” with “

I use it too for embedded. Functions get inlined, fewer registers get saved unnecessarily in functions. I also use “-fdata-sections -ffunction-sections” with “-Wl,--gc-sections” to prune unused sections. There is some evidence this can actually increase your code size sometimes: https://stackoverflow.com/a/29951897 https://stackoverflow.com/a/29951897.