Description
I'm not sure if this belongs here or on the main avr-rust/rust repo, but just wanted to post this here in case it's helpful to anyone else.
I'm using Xargo on Arch Linux with the latest commit of the avr-rust/rust master branch.
I managed to get past avr-rust/rust-legacy-fork#128 using hercek's patches, but building compiler_builtins failed because of a use of the cfg_config_vendor feature. That feature was stabilized earlier this year, but the it looks like the AVR patched Rust version hasn't pulled upstream since the stabilization.
To fix this, I simply modified the downloaded source for lib.rs in compiler_builtins in the Cargo registry folder (~/.cargo/registry/src/hub.490633.xyz-1ecc6299db9ec823/compiler_builtins-0.1.12/src/lib.rs on my machine), adding the missing #![feature(cfg_target_vendor)] line to the existing feature flags in that file.
I also get a message that indicates that it might be possible to set a version for compiler_builtins, though I wasn't able to figure out how:
warning: dependency (compiler_builtins) specified without providing a local path, Git repository, or version to use. This will be considered an error in future versions
The last version of compiler_builtins that has the cfg_target_vendor feature flag appears to be 0.1.5. (relevant commit)
More version info:
$ rustup run avr-toolchain xargo -V
xargo 0.3.14
cargo 1.36.0-nightly (6be12653d 2019-04-19)
$ rustup run avr-toolchain rustc -V
rustc 1.33.0-dev