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This does not yet support #[link_name] attributes on functions, the #[link_ordinal] attribute, #[link(kind = "raw-dylib")] on extern blocks in bin crates, or stdcall functions on 32-bit x86.
The codegen crate contains the code to convert from MIR into LLVM IR,
and then from LLVM IR into machine code. In general it contains code
that runs towards the end of the compilation process.
For more information about how codegen works, see the rustc dev guide.