The easiest to cross compile would be golang, it’s as easy as setting 1-2 environment variables. Last I used rust it required tool chain setup, which if you’re not familiar with the process and be quite difficult.

I tried cross-compiling a Rust project from ARM macOS host to ARM Linux target, compiling source files is still fine, but during linking stage it threw lots of lots of errors. And it’s a pure Rust project without any system library dependencies. Seems that the system linker also needs to support the target platform, or cross compiling won’t work.

Rust has the option of using a different linker for each target platform.

But of course, your linker must support it. I don't know where to get a linker for Linux ARM in macOS. On Debian it's apt install.