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Rollup merge of rust-lang#87315 - ricobbe:raw-dylib-unstable-book, r=…
…wesleywiser Add docs for raw-dylib to unstable book
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# `raw_dylib` | ||
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The tracking issue for this feature is: [#58713] | ||
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[#58713]: https://github.com/rust-lang/rust/issues/58713 | ||
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------------------------ | ||
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The `raw_dylib` feature allows you to link against the implementations of functions in an `extern` | ||
block without, on Windows, linking against an import library. | ||
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```rust,ignore (partial-example) | ||
#![feature(raw_dylib)] | ||
#[link(name="library", kind="raw-dylib")] | ||
extern { | ||
fn extern_function(x: i32); | ||
} | ||
fn main() { | ||
unsafe { | ||
extern_function(14); | ||
} | ||
} | ||
``` | ||
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## Limitations | ||
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Currently, this feature is only supported on `-windows-msvc` targets. Non-Windows platforms don't have import | ||
libraries, and an incompatibility between LLVM and the BFD linker means that it is not currently supported on | ||
`-windows-gnu` targets. | ||
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On the `i686-pc-windows-msvc` target, this feature supports only the `cdecl`, `stdcall`, `system`, and `fastcall` | ||
calling conventions. |