GH-49898: [C++][CI] Use mold in more builds - #49899
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We're currently using the mold linker only on a couple of C++ builds. Use it in more builds to get faster link times and thus faster CI builds.
pitrou
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April 29, 2026 16:27
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@github-actions crossbow submit -g cpp |
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Revision: eb0c13a Submitted crossbow builds: ursacomputing/crossbow @ actions-4c03283919
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@kou Could you take a look at this PR? |
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After merging your PR, Conbench analyzed the 0 benchmarking runs that have been run so far on merge-commit 684c21e. None of the specified runs were found on the Conbench server. The full Conbench report has more details. |
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After merging your PR, Conbench analyzed the 3 benchmarking runs that have been run so far on merge-commit 684c21e. There were no benchmark performance regressions. 🎉 The full Conbench report has more details. It also includes information about 110 possible false positives for unstable benchmarks that are known to sometimes produce them. |
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### Rationale for this change We're currently using the mold linker only on a couple of C++ builds. This PR uses it in more builds to get faster link times and thus faster CI builds. ### Are these changes tested? Yes, by CI builds. ### Are there any user-facing changes? No. * GitHub Issue: apache#49898 Authored-by: Antoine Pitrou <antoine@python.org> Signed-off-by: Sutou Kouhei <kou@clear-code.com>
kou
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May 26, 2026
…1247 (#50033) ### Rationale for this change Fixes #49767 - intermittent SIGSEGV in the ODBC Linux CI job, the crash occurs during `_dl_relocate_object` before `main()` : #49767 (comment) apt ships mold 2.30.0 on Ubuntu 24.04 'Noble Numbat'. mold 2.30.0 has a non-determinism bug in section placement that causes this crash ([rui314/mold#1247](rui314/mold#1247)). Fixed upstream in [mold 2.31.0](https://github.com/rui314/mold/releases/tag/v2.31.0). ### What changes are included in this PR? Disable mold on Ubuntu 24.04 in `ubuntu-24.04-cpp.dockerfile` by setting `ARROW_USE_MOLD=OFF`. Re-enable if apt mold reaches 2.31+ - note that Ubuntu 24.04 'Noble Numbat' might never update to 2.31+ https://launchpad.net/ubuntu/noble/+source/mold - its mold release is over 2 years old. A follow-up issue tracking apt mold updates and other CI jobs using mold (more added with #49898/#49899) will be opened separately. ### Are these changes tested? Yes, ODBC Linux job runs complete successfully on fork: [1st](https://github.com/tadeja/arrow/actions/runs/26389905866/job/77676883090), [2nd](https://github.com/tadeja/arrow/actions/runs/26389905866/job/77684025003) , [3rd](https://github.com/tadeja/arrow/actions/runs/26389905866/job/77685765548) , [4th](https://github.com/tadeja/arrow/actions/runs/26389905866/job/77693037433) ### Are there any user-facing changes? No. * GitHub Issue: #49767 Authored-by: Tadeja Kadunc <tadeja.kadunc@gmail.com> Signed-off-by: Sutou Kouhei <kou@clear-code.com>
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Rationale for this change
We're currently using the mold linker only on a couple of C++ builds. This PR uses it in more builds to get faster link times and thus faster CI builds.
Are these changes tested?
Yes, by CI builds.
Are there any user-facing changes?
No.