> not for the host computer, so "mtune=native" cannot be used.
Right, I am sure they intended it to be absurd in an amusing way.
Indeed I did.
Although, I do somewhat think that working out good optimization flags for cross-platform compiles is a moderately unusual skill, even among people who compile things regularly. Hopefully I caveated that sufficiently, I’m not saying it is a hyper-advanced dark art or anything.
I have in the past set up code on a cluster to just compile on one node for the first run with -mtune=native because I’m lazy!
My point is that you do not need to setup a binrepo or any other complication like this.
You can install easily Gentoo on a very weak computer, by performing the installation on a typical desktop computer, which may run a different Linux distribution, not necessarily also Gentoo, and then just copying the files.
The Gentoo manual has always included information on how to install Gentoo inside a chrooted environment.