Building with the --universal2 flag

[jblindsay]

Greetings! I'm trying to build a universal2 package of my app on my M1 Mac but haven't had much luck so far.

Building with maturin build --release --strip --universal2 results in the following error:

error: could not compile `once_cell` due to 214 previous errors
💥 maturin failed
  Caused by: Failed to build a native library through cargo
  Caused by: Failed to build a x86_64 library through cargo
  Caused by: Cargo build finished with "exit status: 101": `"cargo" "rustc" "--release" "--target" "x86_64-apple-darwin" "--message-format" "json" "--lib" "--" "-C" "link-arg=-undefined" "-C" "link-arg=dynamic_lookup" "-C" "link-args=-Wl,-install_name,@rpath/whitebox_workflows.cpython-310-darwin.so" "-C" "link-arg=-s"`

Do I need to install something perhaps in order to allow a universal2 build to occur? Thanks.

[messense]

You need to install both aarch64 and x86_64 Rust std via rustup

rustup target add aarch64-apple-darwin
rustup target add x86_64-apple-darwin

[jblindsay]

Of course, that's exactly what the answer is! I truly appreciate your time.