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Posted to issues@arrow.apache.org by "Neal Richardson (Jira)" <ji...@apache.org> on 2020/10/15 23:18:00 UTC

[jira] [Created] (ARROW-10321) [C++] Building AVX512 code when we should not

Neal Richardson created ARROW-10321:
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             Summary: [C++] Building AVX512 code when we should not
                 Key: ARROW-10321
                 URL: https://issues.apache.org/jira/browse/ARROW-10321
             Project: Apache Arrow
          Issue Type: Bug
          Components: C++
            Reporter: Neal Richardson


On https://github.com/autobrew/homebrew-core/pull/31, where we are packaging Arrow for an old macOS SDK version, we found what I believe are 2 different problems:

1. The check for AVX512 support was returning true when in fact the compiler did not support it
2. Even when we manually set the runtime SIMD level to less-than-AVX512, it was still trying to compile one of the AVX512 files, which failed. I added a patch that made that file conditional, but there's probably a proper cmake way to tell it not to compile that file at all

cc [~yibo] [~apitrou]



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