`rustc_codegen_nvvm` fails to compile on nightly version of rust that is specified in the `rust-toolchain.toml`
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调研方向
从 rust-toolchain.toml 和 vecadd 示例开始，然后使用指定的 nightly 重现外部 cargo build 失败。将已发布的 rustc_codegen_nvvm 0.3.0 源代码（尤其是 src/lib.rs）与仓库的构建进行比较；当从 vecadd 复制出的新项目无需依赖仓库内的 checkout 即可成功构建时，即视为完成。
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描述
Hi there, I really like this project and want to see it succeed! Thank you for rebooting this, I'm sure I'll end up contributing once I get to grips with things a bit more :)
When doing cargo build in a new project which is simply a copy-paste of the vecadd example, I get this error:
Compiling rustc_codegen_nvvm v0.3.0
error[E0463]: can't find crate for `rustc_attr`
--> /home/ubuntu/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/rustc_codegen_nvvm-0.3.0/src/lib.rs:10:1
|
10 | extern crate rustc_attr;
| ^^^^^^^^^^^^^^^^^^^^^^^^ can't find crate
|
= help: maybe you need to install the missing components with: `rustup component add rust-src rustc-dev llvm-tools-preview`
I also get a laundry list of a bunch of other errors, presumably as a result. Btw I'm using the latest rust-toolchain.toml that's in this repo.
I looked into the source code for rustc_codegen_nvvm, and it is still v0.3.0, but it doesn't have the line extern crate rustc_attr; anywhere. I assume this is as a result of the recent version bump of the nightly Rust dependency. Of course, I can clone this repo, the dev container works just fine, and the vecadd example builds fine when run in this repo, but the build broken when you don't build stuff directly inside this repo.
I think this issue could be solved with a simple version bump + push of the rustc_codegen_nvvm crate. Please could you do this? I'd really love to use this crate even in this early stage, but can't as a result of this.
Alternatively, could you provide the nightly rust version which would successfully compile this? I tried a few different options and various settings in the rust-toolchain.toml but couldn't get anything to work.
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