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https://issues.apache.org/jira/browse/ARROW-17902?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Arrow JIRA Bot reassigned ARROW-17902:
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Assignee: (was: Jin Shang)
> [C++][Gandiva] Solve LLVM 15 CI performace and compatibility issues
> -------------------------------------------------------------------
>
> Key: ARROW-17902
> URL: https://issues.apache.org/jira/browse/ARROW-17902
> Project: Apache Arrow
> Issue Type: Bug
> Components: C++ - Gandiva
> Affects Versions: 9.0.0
> Reporter: Jin Shang
> Priority: Major
>
> Package managers have been upgrading their default LLVM version to 15. This
> raises several compatibility and performance issues for CI, and we currently
> are using workaounds
> # Mac's default clang 13's LTO cannot read Brew installed llvm static libs
> because they are compiled with llvm 15
> ([https://github.com/apache/arrow/pull/14187#issuecomment-1253322948]).
> Workaround: Use brew installed clang: ARROW-17805 ARROW-17842
> # Conda's packaging of LLVM 15 on Windows is not portable. It required a
> VS2019 Enterprise version:
> [https://github.com/conda-forge/llvmdev-feedstock/issues/175.] Workaround:
> Pin LLVM to 14 for Conda with Windows. ARROW-17830
> # Brew's LLVM15 enables z3 by default and it's shared linked. It breaks Java
> jar builds on MacOS:
> [https://github.com/apache/arrow/pull/14261#issuecomment-1263024112.]
> Workaround: Pin LLVM to 14 for all MacOS tasks.
> # LLVM 15 is noticably slower to build than LLVM 14 for brew and MacOS.
> Workaround: Pin LLVM to 14 for all MacOS tasks. ARROW-17872
> We need to find a way to resolve these workarounds for LLVM 15.
> Edit: The current mac os runner we use `macos-latest` has llvm@14
> preinstalled. So pinning to 14 can save build time and fix dependency issues.
> We can move to llvm@15 on mac once the github images support them by default.
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