xx-cargo broken with xx-sdk

[milas]

When using xx-sdk (osxcross), xx-cargo tries to set an invalid var:

/usr/bin/xx-cargo: export: line 84: CARGO_TARGET_ARM64_UNKNOWN_MACOS10.16_LINKER: bad variable name

This is because the result from xx-info is arm64-apple-macos10.16, which is then transformed for the CARGO_TARGET_{triple}_LINKER env var:

xx/src/xx-cargo

Line 84 in 2fc8560

export "CARGO_TARGET_$(xx-info | tr '[:lower:]' '[:upper:]' | tr - _)_LINKER=$(xx-info)-clang"

---

I think this needs to be aarch64-apple-darwin based on available rustc triples:

❯ rustc --print target-list | rg darwin
aarch64-apple-darwin
arm64e-apple-darwin
i686-apple-darwin
x86_64-apple-darwin
x86_64h-apple-darwin

[milas]

Just as a note to others - there's broader problems with cross-compiling from Linux to macOS w/ Rust. The cross project might be worth looking at, but it seems to assume an amd64 host.

I got further by using xx-clang --setup-target-triple and setting env vars myself, but eventually hit issues due to needing objcopy & friends.