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| -rw-r--r-- | src/doc/unstable-book/src/compiler-flags/codegen-backend.md | 28 |
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diff --git a/src/doc/unstable-book/src/compiler-flags/codegen-backend.md b/src/doc/unstable-book/src/compiler-flags/codegen-backend.md new file mode 100644 index 00000000000..28f173cb0f3 --- /dev/null +++ b/src/doc/unstable-book/src/compiler-flags/codegen-backend.md @@ -0,0 +1,28 @@ +# `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) +} +``` |