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@ -4,9 +4,9 @@ This repository contains a simple `Hello world!` example in the [Rust][rust]
programming language, that builds with [Cosmopolitan Libc][cosmo].
I created a [custom compilation target][custom-target] for Rust, called
`x86_64-unknown-linux-cosmo`, to provide a build process the Cosmopolitan Libc
amalgamation and `cargo`. I followed the documentation in the [Rust
Embedonomicon][custom-embed] to create the target.
`x86_64-unknown-linux-cosmo`, to provide a build process that uses the
Cosmopolitan Libc amalgamation and `cargo`. I followed the documentation in the
[Rust Embedonomicon][custom-embed] to create the target.
An alternative method to build APEs with Rust would be to avoid `cargo`, just
use `rustc` or equivalent compiler to generate `.o` files, and then write a
@ -24,11 +24,15 @@ unzip cosmopolitan.zip
cd ../
```
2. Download the necessary toolchain(s) and source code for Rust:
2. Download the necessary *host* toolchain and source code for Rust:
```bash
# I was on Debian, so I did this
rustup toolchain install nightly-x86_64-unknown-linux-gnu
rustup component add rust-src --toolchain nightly-x86_64-unknown-linux-gnu
# on Alpine Linux, you may need to do
rustup toolchain install nightly-x86_64-unknown-linux-musl
rustup component add rust-src --toolchain nightly-x86_64-unknown-linux-musl
```
3. run `cargo build` to get the debug executable. This uses a bash script that
@ -54,8 +58,8 @@ that can be tested:
function and `#![restricted_std]`.
2. In the source code for Rust's `std` crate, change a `cfg_if` in
`$HOME/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/backtrace/src/backtrace/mod.rs`
to not use the `noop` trace instead of depending on `libunwind`.
`$HOME/.rustup/toolchains/<your-host-nightly-toolchain>/lib/rustlib/src/rust/library/backtrace/src/backtrace/mod.rs`
to use the `noop` trace instead of depending on `libunwind`.
```diff
--- mod.rs 2022-06-21 12:52:21.724053459 +0530