On Tue, Mar 6, 2018 at 11:12 AM, Martin Liška <mli...@suse.cz> wrote: > Hello. > > Many significant changes has landed in mainline and will be released as GCC > 8.1. > I decided to use various GCC configs we have and test how there configuration > differ > in size and also binary size. > > This is first part where I measured binary size, speed comparison will follow. > Configuration names should be self-explaining, the 'system-*' is built done > without bootstrap with my system compiler (GCC 7.3.0). All builds are done > on my Intel Haswell machine.
So from the numbers I see that bootstrap causes a 8% bigger binary compared to non-bootstrap using GCC 7.3 at -O2 when including debug info and 1.2% larger stripped. That means trunk generates larger code. What is missing is a speed comparison of the various binaries -- you could try measuring this by doing a make all-gcc for a non-bootstrap config (so it uses -O2 -g and doesn't build target libs with the built compiler). Richard. > Feel free to reply if you need any explanation. > Martin
