Unable to build aws-smithy-checksums in MacOS ARM using nightly toolchains post 14th May

[navasvarela]

When trying to compile a project in MacOS ARM (Sonoma), using any nightly toolchain after 2024-05-14, the following error occurs:

error[E0635]: unknown feature `stdarch_arm_crc32`
  --> USER_HOME/.cargo/registry/src/index.crates.io-6f17d22bba15001f/crc32c-0.6.5/src/lib.rs:23:60
   |
23 | #![cfg_attr(all(target_arch = "aarch64", nightly), feature(stdarch_arm_crc32))]
   |                                                            ^^^^^^^^^^^^^^^^^

aws-smithy-checksums depends on crc32c version 0.6.5. This version of crc32c uses a feature that was removed on 14th May and causes compilation errors (see rust-lang/stdarch#1573). This problem has been fixed in subsequent releases of crc32c. It seems that the fix for this should be relatively simple.

[aajtodd]

Pinning crc32c was done here to work around build failures and ensure the SDK can continue to be released.

The underlying issue doesn't appear to be resolved/released and so until then we'll be pinned to 0.6.5.

[orlp]

@aajtodd That does mean anything that uses aws-smithy-checksums, which includes aws-sdk-s3 simply does not build on the latest nightly on ARM, which includes all developers on Apple M* laptops.

[aajtodd]

Understood. This is blocked on a release of crc32c that fixes this issue right now. It looks like a fix was committed for zowens/crc32c#67 but has not yet made it into a release.

[Andrewp2]

I think that commit has made it into 0.6.8
zowens/crc32c#70
https://crates.io/crates/crc32c/0.6.8

[ysaito1001]

We just released a new aws-smithy-checksums that depends on crc32c version 0.6.8. Could you try compiling your project and see if it works now?

[Andrewp2]

My project is working, which compiles to AWS Lambda ARM. I don't have a mac device to check there.

[navasvarela]

I can confirm that this works now for me in my Mac