The sysroot can't be built for the Stable channel

help
1

Hello guys!

I am new to the world of rust and in particular to rust drivers.

I'm trying to compile an example driver found on the web but for some reason I am not able to achieve it

When I try to run the command:

cargo xbuild --target x86_64-linux-kernel-module

I get the following error:

error: The sysroot can't be built for the Stable channel. Switch to nightly.

Reading about it on the web, I think I have understood that I must use the nightly version in order to compile. I have followed several steps including downloading the nightly version toolchain and setting it up.

rustup toolchain install nightly

info: syncing channel updates for 'nightly-x86_64-unknown-linux-gnu'

nightly-x86_64-unknown-linux-gnu unchanged - rustc 1.51.0-nightly (c5a96fb79 2021-01-19)

rustup override set nightly

If I run: rustup show

I get:
Default host: x86_64-unknown-linux-gnu
rustup home: /path/to/snap/rustup/common/rustup

nightly-x86_64-unknown-linux-gnu (directory override for '/path/to/my/directory/linux-kernel-module-rust')
rustc 1.51.0-nightly (c5a96fb79 2021-01-19)

But, when I try to compile again I keep getting the same error.

Fun fact is that when I run: rustc --version

I get: rustc 1.43.0

Shouldn't it be rustc 1.51.0-nightly?

Any help will help me a lot.

Thank you!

2

What is the output of

$ which rustc

on your system? There's probably another rustc binary on your PATH that's stepping on the toes of the rustup-managed version, which lives in ~/.cargo/bin.

3

which -a rustc will show all of them in your PATH, in the order they are found.

2 Likes
4

the output for whic rustc and which -a rust is the same, it's /usr/bin/rustc.

How can I fix this?

5

If you installed Rust through your distro's package manager, uninstall that and just use rustup. Packaged versions of Rust tend to be significantly out of date. (And make sure ~/.cargo/bin is in your PATH.)

2 Likes
6

Thanks guys!! Removing the other binary resolved the problem!

Thanks!!!

1 Like
7

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