Rust on M1

Installing fnm on my new work M1 failed due to not being able to link liblzma.dylib.

The error says that

... ignoring file /opt/homebrew/Cellar/xz/5.2.5/lib/liblzma.dylib, building for macOS-x86_64 but attempting to link with file built for macOS-arm64

The clue is in x86_64: Homebrew installed properly for M1 (aka aarch64) which you can tell from the path /opt/homebrew/ (its slightly differnet on Intel).

Running rustup toolchain list both on the work and personal M1 laptops, revealed the differnece:

work laptop:

$ rustup toolchain lists
stable-x86_64-apple-darwin

vs personal:

$ rustup toolchain lists
stable-aarch64-apple-darwin

My temporary "fix" is to add the aarch64 target to rustup and specifically install fnm with it:

$ rutusp target add aarch64-apple-darwin
$ cargo install --target aarch64-apple-darwin fnm
[...lots of output...]
Installed package `fnm v1.28.2` (executable `fnm`)