add aarch64 support

[lizan]

Signed-off-by: Lizan Zhou lizan@tetrate.io

[dfreese]

Thanks! Generally good with everything in the PR, but a little hesitant to have this function now pull 4 toolchains when most folks need 1 of these, sometime 2. I'd generally encourage calling rust rust_repository_set explicitly.

Is there a pattern of usage that you're seeing?

Perhaps this function could become more generally useful if the exec_triple's called were a parameter?

# maintain backwards compatibility
if exec_triples is None:
    exec_triples = [
        "rust_linux_x86_64",
        "rust_darwin_x86_64,
        "rust_freebsd_x86_64",
        "rust_windows_x86_64",
    ]

for exec_triple in exec_triples:
    rust_repository_set(
        name = "rust_linux_aarch64",
        exec_triple = exec_triple,
        extra_target_triples = ["wasm32-unknown-unknown"],
        version = version,
        iso_date = iso_date,
        rustfmt_version = rustfmt_version,
        edition = edition,
        dev_components = dev_components,
        sha256s = sha256s,
    )

[mfarrugi]

Aren't the toolchains lazily fetched?

[dfreese]

Ah, yeah. Good point.