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Enable LLVM Thin LTO for LoongArch64 - #162748

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Enable LLVM Thin LTO for LoongArch64#162748
heiher wants to merge 1 commit into
rust-lang:mainfrom
heiher:loong64-llvm-clang-thin-lto

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@heiher heiher commented Sep 14, 2026

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This PR switches the LLVM build cross-compiler from GCC to Clang and enables LLVM Thin LTO for LoongArch64 distributions.

There is no significant performance difference with this change. It also reduces the size of the build artifacts:

Artifacts Before After
rust-nightly-loongarch64-unknown-linux-gnu.tar.xz 287M 177M
rust-nightly-loongarch64-unknown-linux-gnu directory 1.6G 849M
rust-nightly-loongarch64-unknown-linux-musl.tar.xz 285M 177M
rust-nightly-loongarch64-unknown-linux-musl directory 1.6G 847M

@heiher
Enable LLVM Thin LTO for LoongArch64
f7dcbf3 
This PR switches the LLVM build cross-compiler from GCC to Clang and
enables LLVM Thin LTO for LoongArch64 distributions.

There is no significant performance difference with this change. It
also reduces the size of the build artifacts:

| Artifacts                                             | Before | After |
|-------------------------------------------------------|--------|-------|
| rust-nightly-loongarch64-unknown-linux-gnu.tar.xz     | 287M   | 177M  |
| rust-nightly-loongarch64-unknown-linux-gnu directory  | 1.6G   | 849M  |
| rust-nightly-loongarch64-unknown-linux-musl.tar.xz    | 285M   | 177M  |
| rust-nightly-loongarch64-unknown-linux-musl directory | 1.6G   | 847M  |
@rustbot rustbot added A-CI Area: Our Github Actions CI 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 Sep 14, 2026
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rustbot commented Sep 14, 2026

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r? @jieyouxu

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The reviewer was selected based on:

  • Owners of files modified in this PR: infra-ci
  • infra-ci expanded to Kobzol, Mark-Simulacrum, jieyouxu, marcoieni, ubiratansoares
  • Random selection from Mark-Simulacrum, jieyouxu, marcoieni, ubiratansoares

@jieyouxu

jieyouxu commented Sep 14, 2026

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@bors try jobs=dist-loongarch64*

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rust-bors Bot pushed a commit that referenced this pull request Sep 14, 2026
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Auto merge of #162748 - heiher:loong64-llvm-clang-thin-lto, r=<try>
ff6adf0 
Enable LLVM Thin LTO for LoongArch64


try-job: dist-loongarch64*
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rust-bors Bot commented Sep 14, 2026

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☀️ Try build successful (CI)
Build commit: ff6adf0 (ff6adf0bbeb9d9b3157a53c0f01b0ed70e12f840)
Base parent: 4b6d04e (4b6d04e706108ccfeafe2547fbe857dfe8972bad)

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A-CI Area: Our Github Actions CI 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.

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