Failed to run custom build command on Apple Silicon

[p-kuen]

I wanted to try out actix-web with the new Apple Silicon MacBook and ran into some errors.

One of them was an error when compiling the syn crate:

patrickkuen@mbp-von-patrick clime-server % cargo build
    Updating crates.io index
   Compiling proc-macro2 v1.0.24
   Compiling unicode-xid v0.2.1
   Compiling syn v1.0.52
error: failed to run custom build command for `syn v1.0.52`

Caused by:
  process didn't exit successfully: `/Users/patrickkuen/Developer/cloudacy/clime/clime-server/target/debug/build/syn-68e8dc1d3fac40d1/build-script-build` (signal: 9, SIGKILL: kill)
warning: build failed, waiting for other jobs to finish...
error: build failed

rustup-toolchain:

beta-aarch64-apple-darwin (default)
rustc 1.49.0-beta.2 (bd26e4e54 2020-11-24)

Steps to reproduce

1. Create a new project using cargo new
2. Add the syn = "1.0" package under Cargo.toml
3. Run cargo build

[dtolnay]

Thanks -- I'm sure I won't be able to reproduce this, but I would accept a PR to fix it.

[p-kuen]

Thanks for your fast answer. I would be glad to help - I am not a rust pro, so where can I find clearer error messages to start with?

[p-kuen]

After some tests with different packages it seems that every package using a custom build.rs crashes with this error. Therefore I created a new issue on the cargo package (rust-lang/cargo#8913).