How to get assembly output from building with Cargo?

Question

You can use Cargo’s cargo rustc command to send arguments to rustc directly:

cargo rustc -- --emit asm
ls target/debug/deps/<crate_name>-<hash>.s

For optimized assembly:

cargo rustc --release -- --emit asm
ls target/release/deps/<crate_name>-<hash>.s

If you see multiple <crate_name>-<hash>-<hash>.rcgu.s files instead of a <crate_name>-<hash>.s file, disable incremental compilation by setting the environment variable CARGO_INCREMENTAL=0.

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