apple-m1 detected as the native CPU for rustc on apple-m2

[betelgeuse]

I tried this command

$ rustc --print target-cpus | head -n 2
Available CPUs for this target:
    native          - Select the CPU of the current host (currently apple-m1).

I expected to see this happen: explanation

I ran the command on a apple-m2 Macbook Pro so that should be selected as the native cpu.

Instead, this happened: explanation

apple-m1 was selected

Meta

rustc --version --verbose:

rustc 1.81.0-nightly (ed7e35f34 2024-07-06)
binary: rustc
commit-hash: ed7e35f3494045fa1194be29085fa73e2d6dab40
commit-date: 2024-07-06
host: aarch64-apple-darwin
release: 1.81.0-nightly
LLVM version: 18.1.7

Linking tracker #73908

[ehuss]

Thanks for the report! I believe this will be fixed when we update to LLVM 19 via llvm/llvm-project#82100 (see schedule).

[veera-sivarajan]

@rustbot label -needs-triage +O-apple +llvm-fixed-upstream +T-compiler

[nikic]

Can somebody on M2 please confirm that this is indeed fixed on current nightly?

[lukaslueg]

$ rustup run nightly rustc --version
rustc 1.82.0-nightly (28a58f2fa 2024-07-31)

$ sysctl -n machdep.cpu.brand_string
Apple M3 Pro

$ rustup run nightly rustc --print target-cpus | head -n2
Available CPUs for this target:
    native          - Select the CPU of the current host (currently apple-m3).

For comparison

$ rustup run stable rustc --print target-cpus | head -n2
Available CPUs for this target:
    native          - Select the CPU of the current host (currently apple-m1).

[nikic]

Awesome, thanks for the confirmation!