How do I get the Rust compiler to dump out the LLVM it generates?

Question

I'd like to see the LLVM that the Rust compiler generates. Even better would be to have it just dump out LLVM and stop. This could be in bitcode format or assembler text.

Answer 1

You can pass the formats which you want to --emit

e.g.

rustc --emit=asm,llvm-bc,llvm-ir xxx.rs

or

cargo rustc -- --emit=asm,llvm-bc,llvm-ir

more information please see rustc --help