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Update dist-x86_64-linux host toolchain to LLVM 21 #144117

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Update dist-x86_64-linux host toolchain to LLVM 21 #144117

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nikic
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@nikic nikic commented Jul 18, 2025 •
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This updates the host clang used to build LLVM, as well as llvm-bolt. This avoids the bolt miscompile encountered in #143684.

r? @ghost

@rustbot rustbot added A-testsuite Area: The testsuite used to check the correctness of rustc S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-infra Relevant to the infrastructure team, which will review and decide on the PR/issue. labels Jul 18, 2025
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nikic commented Jul 18, 2025

@bors2 try @rust-timer queue

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Awaiting bors try build completion.

@rustbot label: +S-waiting-on-perf

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rust-bors bot commented Jul 18, 2025

⌛ Trying commit 838cf2b with merge eeb3bdc…

To cancel the try build, run the command @bors2 try cancel.

rust-bors bot added a commit that referenced this pull request Jul 18, 2025
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Auto merge of #144117 - nikic:llvm-21-host, r=<try>
eeb3bdc 
Update dist-x86_64-linux host toolchain to LLVM 21

This updates the host clang used to build LLVM, as well as llvm-bolt. This avoids the bolt miscompile encountered in #144116.

r? `@ghost`
@rustbot rustbot added the S-waiting-on-perf Status: Waiting on a perf run to be completed. label Jul 18, 2025
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Kobzol commented Jul 18, 2025 •
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You can r=me if the try build succeeds and perf is fine.

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rust-bors bot commented Jul 18, 2025

💔 Test failed

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nikic commented Jul 18, 2025 

    = note: rust-lld: error: /tmp/rustcCHWdg1/libtikv_jemalloc_sys-dd62f3b37b8a87ec.rlib(jemalloc.pic.o): Invalid record
            clang: error: linker command failed with exit code 1 (use -v to see invocation)

Looks like we can't actually update the host toolchain first, as we'll end up trying to link LLVM 21 bitcode with LLVM 20 lld. We'll have to update both at the same time...

@nikic nikic closed this Jul 18, 2025
@rustbot rustbot removed the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Jul 18, 2025
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