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Add runtime architecture testing for x86_64 and ARM#4428

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crc-fast
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Add runtime architecture testing for x86_64 and ARM#4428
vcjana wants to merge 23 commits intomainfrom
crc-fast

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@vcjana vcjana commented Dec 1, 2025

Summary

Adds multi-architecture testing to smithy-rs CI to catch architecture-specific issues like crc-fast 1.4 SIGILL on ARM before merge.

Changes

  • Added test-runtime-architectures job to CI workflow
  • Tests runtime crates on 4 architectures:
    • x86_64-unknown-linux-gnu
    • x86_64-unknown-linux-musl
    • aarch64-unknown-linux-gnu (ARM)
    • aarch64-unknown-linux-musl (ARM)
  • Uses cross for cross-compilation and testing
  • Runs on every PR

Why its needed?

The crc-fast 1.4 SIGILL bug was only caught after release because smithy-rs only tested on x86_64. This change would have caught it before merge by testing on ARM.

Testing

  • Code compiles
  • YAML syntax is valid
  • CI passes on all architectures

@vcjana vcjana force-pushed the crc-fast branch 2 times, most recently from bcc2ced to 24b01eb Compare December 1, 2025 23:06
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@vcjana vcjana marked this pull request as ready for review December 3, 2025 22:24
@vcjana vcjana requested review from a team as code owners December 3, 2025 22:24
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@landonxjames landonxjames left a comment

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This generally looks good. Couple of questions in the comments.

The last thing that I would like to see is a test run with the new workflow with crc-fast pinned to the problematic version (1.4 I think?) that fails. It would be nice to have some proof that these new tests would have caught the issue we saw that caused us to pin the dependency in the first place.

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@vcjana vcjana mentioned this pull request Dec 9, 2025
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vcjana commented Dec 9, 2025

Created test PR #4446 with crc-fast pinned to 1.4. Once CI runs, it should demonstrate the ARM tests failing with SIGILL, proving these architecture tests would have caught the issue before merge.

As suggested in review, aws-smithy-http-client should be tested across
architectures since its dependencies (rustls, aws-lc) have arch-specific
implementations.
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@vcjana vcjana marked this pull request as draft January 27, 2026 18:25
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