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Use rustup for cross compiling libcore

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Philipp Oppermann
2016-09-22 15:15:46 +02:00
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blog/post/03-set-up-rust.md
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@@ -80,13 +80,16 @@ Let's break it down:
[unwinding]: https://doc.rust-lang.org/nomicon/unwinding.html
## Building Rust
We can now build it using `cargo build`. To make sure, we are building it for the x86_64 architecture, we can pass an explicit target:
We can now build it using `cargo build`. To make sure that we build it for the x86_64 architecture and that we use a Linux compatible format, we pass an explicit [target triple]:
[target triple]: https://github.com/japaric/rust-cross#the-target-triple
```bash
cargo build --target=x86_64-unknown-linux-gnu
```
It creates a static library at `target/x86_64-unknown-linux-gnu/debug/libblog_os.a`, which can be linked with our assembly kernel. If you're getting an error about a missing `core` crate, [look here][cross compile libcore].
[cross compile libcore]: {{% relref "cross-compile-libcore.md" %}}
This command creates a static library at `target/x86_64-unknown-linux-gnu/debug/libblog_os.a`, which can be linked with our assembly kernel.
(If you're getting an error about a missing `core` crate, you're probably using a host system with a different target triple. You can easily resolve this by executing `rustup target add x86_64-unknown-linux-gnu`. This command will install the pre-compiled standard libraries for this target, including the missing `core` crate.)
To build and link the rust library on `make`, we extend our `Makefile`([full file][github makefile]):