Unable to verify that produced executable is an ARM binary with `cargo readobj`: no such subcommand

Question

I am learning embedded Rust. I've setup the environment and am now following the Build It instructions.

When I verify that the produced executable is an ARM binary by running the command

cargo readobj --target thumbv7em-none-eabihf --bin led-roulette -- -file-headers

It generates an error:

error: no such subcommand: readobj

I've also tried the command

cargo readelf -h target/thumbv7em-none-eabihf/debug/led-roulette 

It generates the error:

error: no such subcommand: readelf

Answer 1

Before running these commands, you have to install the tools as described in chapter 3.

If you did that already, then make sure you are in the src/05-led-roulette directory.

Answer 2

The cargo package that we install by default doesn't provide the readobj subcommand, so you need to add this subcommand explicitly:

cargo install cargo-binutils --vers 0.1.4

Answer 3

Most answers here suggest installing version 0.1.4 of cargo-binutils to fix this problem. Although this works, the recommended way is installing the latest stable version, and just after that install llvm-tools-preview to supply all the missing commands:

$ cargo install cargo-binutils
$ rustup component add llvm-tools-preview

This is documented in the cargo-binutils crate.