30 lines
1.1 KiB
Markdown
30 lines
1.1 KiB
Markdown
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# The `rustc-std-workspace-core` crate
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This crate is a shim and empty crate which simply depends on `libcore` and
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reexports all of its contents. The crate is the crux of empowering the standard
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library to depend on crates from crates.io
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Crates on crates.io that the standard library depend on the
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`rustc-std-workspace-core` crate from crates.io. On crates.io, however, this
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crate is empty. We use `[patch]` to override it to this crate in this
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repository. As a result, crates on crates.io will draw a dependency edge to
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`libcore`, the version defined in this repository. That should draw all the
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dependency edges to ensure Cargo builds crates successfully!
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Note that crates on crates.io need to depend on this crate with the name `core`
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for everything to work correctly. To do that they can use:
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```toml
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core = { version = "1.0.0", optional = true, package = 'rustc-std-workspace-core' }
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```
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Through the use of the `package` key the crate is renamed to `core`, meaning
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it'll look like
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```
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--extern core=.../librustc_std_workspace_core-XXXXXXX.rlib
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```
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when Cargo invokes the compiler, satisfying the implicit `extern crate core`
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directive injected by the compiler.
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