rustc-native: Can't get target-list

[mhuangwm]

Version(s) of meta-rust

master

Version(s) of poky and/or oe-core

dunfell

Expected result

running rustc --print target-list should provide a list of targets

Actual result

running above command provides:

error: Error loading target specification: Could not find specification for target "x86_64-linux". Run `rustc --print target-list` for a list of built-in targets

Steps to reproduce

1. Build rustc-native bitbake rust-native. Ensure work is not removed
2. from rustc work directory, find the to-be installed vesrion of rustc. This is usually in image/<something>/x86_64-linux/rust-native/<more stuff>/recipe-sysroot-native/usr/bin/rustc
3. Run the command rustc --print target-list from OUTSIDE of the directory of where the binary is located.

Funnily enough, if I run it inside the directory where rustc is located, I don't get any errors.

I'm trying to get python3-cryptography version 36, 37, 39 running on our dunfell builds. These have a dependency on rust and somewhere in the setuptools, it's running ['rustc', '--print', ''-target-list"]

[mhuangwm]

top google search hinted at exporting RUST_TARGET_PATH to location of rustlib which helps resolve the issue.

[microhobby]

@mhuangwm I was trying to add the RUST_TARGET_PATH, this appears to fix the native case, but now I'm getting the error message for the aarch64 target. Did you get any fixes for this?

[mhuangwm]

Sorry I don't recall having any issues with the aarch64 target.