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Document -Z codegen-backend in the unstable book #77934

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Document -Z codegen-backend in the unstable book
XAMPPRocky Oct 14, 2020
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Update src/doc/unstable-book/src/compiler-flags/codegen-backend.md
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Update codegen-backend.md
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28 changes: 28 additions & 0 deletions src/doc/unstable-book/src/compiler-flags/codegen-backend.md
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# `codegen-backend`

The tracking issue for this feature is: [#77933](https://github.com/rust-lang/rust/issues/77933).

------------------------

This feature allows you to specify a path to a dynamic library to use as rustc's
code generation backend at runtime.

Set the `-Zcodegen-backend=<path>` compiler flag to specify the location of the
backend. The library must contain a function named `__rustc_codegen_backend`
with a signature of `fn() -> Box<dyn rustc_codegen_ssa::traits::CodegenBackend>`.

## Example
```rust
use rustc_codegen_ssa::traits::CodegenBackend;

struct MyBackend;

impl CodegenBackend for MyBackend {
// Implement codegen methods
}

#[no_mangle]
pub fn __rustc_codegen_backend() -> Box<dyn CodegenBackend> {
Box::new(MyBackend)
}
```