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Link to LLVM docs for the data-layout field

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Philipp Oppermann
2019-01-02 20:45:07 +01:00
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blog/content/second-edition/posts/02-minimal-rust-kernel/index.md
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@@ -107,8 +107,9 @@ For our target system, however, we require some special configuration parameters
}
```
Most fields are required by LLVM to generate code for that platform. For example, the `data-layout` field defines the size of various integer, floating point, and pointer types. Then there are fields that Rust uses for conditional compilation, such as `target-pointer-width`. The third kind of fields define how the crate should be built. For example, the `pre-link-args` field specifies arguments passed to the [linker].
Most fields are required by LLVM to generate code for that platform. For example, the [`data-layout`] field defines the size of various integer, floating point, and pointer types. Then there are fields that Rust uses for conditional compilation, such as `target-pointer-width`. The third kind of fields define how the crate should be built. For example, the `pre-link-args` field specifies arguments passed to the [linker].
[`data-layout`]: https://llvm.org/docs/LangRef.html#data-layout
[linker]: https://en.wikipedia.org/wiki/Linker_(computing)
We also target `x86_64` systems with our kernel, so our target specification will look very similar to the one above. Let's start by creating a `x86_64-blog_os.json` file (choose any name you like) with the common content: