How to force portage to use a specific rust version?

[gorg86]

Hello,

How do I tell portage to use a specific version of rust?
eselect has no effect for some reason.

Thanks

background:
I need to use this upstream commit for virtiofsd https://gitlab.com/virtio-fs/virtiofsd/ ... quests/306

But when I use the patch I get this error:

Code: Select all

 * /opt/rust-bin-1.92.0/bin/cargo build --release
error: failed to select a version for the requirement `vhost = "^0.15.0"` (locked to 0.15.0)
candidate versions found which didn't match: 0.13.0
location searched: directory source `/var/tmp/portage/app-emulation/virtiofsd-1.13.2/work/cargo_home/gentoo` (which is replacing registry `crates-io`)
required by package `virtiofsd v1.13.2 (/var/tmp/portage/app-emulation/virtiofsd-1.13.2/work/virtiofsd-v1.13.2)`

So I installed rust rust-bin-1.84.0 to have vhost-0.13.0 but portage is not using it.

[sam_]

Your original question is answered in bug 961291, but it's unrelated to your problem AFAICT. The issue with that is the crate downloaded earlier on doesn't match the Cargo.lock changes in the patch. It is unrelated to your Rust version. You're best off using -9999.

[gorg86]

Ok thanks, I mixed things up.

EDIT:
-9999 spits out the same error