Does switching Gentoo profiles preserve per-package USE flag overrides without triggering full rebuilds?
Profile transition and USE flag inheritance Gentoo profiles define baseline USE flags in make.defaults , while administrators set global flags in /etc/portage/make.conf and per-package overrides in /etc/portage/package.use . When migrating from default/linux/amd64/17.1 to default/linux/amd64/17.1/desktop/gnome , the new profile adds flags such as systemd and