How to select version

[frosch01]

Hi,

when I check the code, it seems there are many different cargo version supported at the same time. Can you please update documentation on how a version can be selected. I was not able to find an answer looking at the Yocto documentation.

Thx

Ralph

[seimonw]

I use yocto's PREFERRED_VERSION variable, set in my local.conf:

PREFERRED_VERSION_rust-bin-cross-arm = "1.76.0"
PREFERRED_VERSION_cargo-bin-cross-arm = "1.76.0"

[robagar]

Is it possible to select the rust version on a per-recipe basis? Generally I want to use latest stable rust, but some things need a fixed version (specifically in our case, Zenoh needing to built with rust 1.75)

[seimonw]

I don't think there's an easy way to do this, to my knowledge you can't have two versions of a package at the same time.
Only thing I could think of is something like creating your own cargo-bin-175 class and pulling that into your zenoh recipe instead of the regular class.
Feels a bit messy, but might work!

[nastevens]

There's no guide for it at the moment, but it should be possible to use Yocto multiconfig to do this. There's a short guide here and more details in the Yocto documentation itself.

If you get this working it'd be awesome to see your notes on how!

[seimonw]

Yeah, that works @nastevens

I was able to create a build/conf/multiconfig/rust-175.conf:

PREFERRED_VERSION_rust-bin-cross-arm = "1.75.0"
PREFERRED_VERSION_cargo-bin-cross-arm = "1.75.0"

Add BBMULTICONFIG = "rust-175" to my local.conf

Then bitbake mc:rust-175:myrustdemo

In myrustdemo's log.do_compile I can see

NOTE: rustc --version rustc 1.75.0 (82e1608df 2023-12-21)
NOTE: cargo --version cargo 1.75.0 (1d8b05cdd 2023-11-20)

[nastevens]

That's great, thanks for testing that out @seimonw!

[MirkoDonnarumma]

Hello guys, thank you for your effort.
@seimonw I tried what you did but ended up with an error.

my local.conf:

BBMULTICONFIG = "rust-175"

my conf/multiconfig/rust-175.conf:

PREFERRED_VERSION_rust-bin-cross-arm = "1.75.0"
PREFERRED_VERSION_cargo-bin-cross-arm = "1.75.0"

Then I ran bitbake mc:rust-175:myrustapp and I got this:

Log data follows:
| DEBUG: Executing shell function do_compile
| NOTE: cargo = /home/qtmmidonnar/Progetti/qm-reborn/poky/build/tmp/work/cortexa53-fslc-linux/quantum-manager/0.1.0.AUTOINC+c9064c40bd-r0/recipe-sysroot-native/usr/bin/cargo
| NOTE: rustc =
| NOTE: cargo build -v --target aarch64-fslc-linux --release --manifest-path=/home/qtmmidonnar/Progetti/qm-reborn/poky/build/tmp/work/cortexa53-fslc-linux/quantum-manager/0.1.0.AUTOINC+c9064c40bd-r0/git//Cargo.toml
| error: package `libc v0.2.171` cannot be built because it requires rustc 1.63 or newer, while the currently active rustc version is 1.59.0
| WARNING: exit code 101 from a shell command.

Did it happen to you as well? If so, how did you resolve this?

The branches I am using are all "kirkstone" while the latest commit I am using for meta-rust-bin is master:85a33ed0725c8e88f8e103c347d207c602f8b86e

I hope you can help me because i've been trying to make this work for the past 3 weeks (yeah, i'm a newbie lol)

Thank you for your time

[seimonw]

Hi @MirkoDonnarumma
Not sure about what you are seeing - it looks like you have something major wrong, as you seem to be using v1.59.0. Do you definitely need to use more than one version of rust in your project? If not, just remove all version definitions and let yocto/meta-rust-bin pull the latest.