Hi Christophe, I personally recommend you to try it within a docker container, or a chroot environment. On 2019-05-24 14:23, Christophe Trophime wrote: > Hi, > I would like to try gcc-9 on a Debian/testing. > It seems that install gcc-9 from experimental will update libatomic1 > and libgcc1 > I guess this is not safe to do that? > > What is the best way to try gcc-9 then?