Am Sat, Jun 28, 2025 at 10:33:24AM -0700 schrieb Jay Faulkner: > On 6/28/2025 9:38 AM, whiteman808 wrote: > > Is it necessary to reinstall Gentoo if I change CPU or motherboard? If > > not, what steps should be done on the existing Gentoo installation? Do I > > need to do these operations from chroot? > > I'm assuming this is amd64->amd64. > > So the main thing to worry about is CPU compatibility, and your CFLAGS. If > you're using -march=native, there's a chance your system won't work as > compiled. This isn't always true, but these days it's no longer a guarantee > that a newer CPU will have all the features of the old. > > > What I usually do in this case is: > > - set -march=x86-64-v3 (or whatever lowest-common-denominator CPU arch > generic target works) -- > https://wiki.gentoo.org/wiki/Safe_CFLAGS#Generic_psABI_levels can help with > this. - Ensure my system is fully updated, and `emerge --depclean`'d. - > emerge -e @world # this will rebuild your entire system.
I see no point in rebuilding the system on the old machine with with a generic -march, just to migrate it to a new machine where you rebuild it again with -march=native. So if you do run march=native and it doesn’t just boot, I would build from scratch and migrate my settings. It’s more efficient. -- Grüße | Greetings | Salut | Qapla’ Please do not share anything from, with or about me on any social network. The Bible says to work for six days and rest on the seventh. But where is it written that we shall start fresh on the eigth?
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