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authorbors <bors@rust-lang.org>2022-02-21 13:13:04 +0000
committerbors <bors@rust-lang.org>2022-02-21 13:13:04 +0000
commit1103d2e914b67c18b0deb86073c26c6aefda761d (patch)
treeebbd8825ed802b5516df8d6028d707a8d104c8a7 /compiler/rustc_codegen_llvm/src
parenta924ef73bce6c20b84b1350b256a923b6d36c056 (diff)
parent9f76214854117747919f8427a7a17346d6f716d9 (diff)
downloadrust-1103d2e914b67c18b0deb86073c26c6aefda761d.tar.gz
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Auto merge of #94205 - Mark-Simulacrum:revert-93800, r=oli-obk
Revert #93800, fixing CI time regression

This reverts commit a240ccd81c74c105b6f5fe84c46f8d36edb7e306 (merge commit of #93800), reversing
changes made to 393fdc10483da930cdbb00eabc3635030d2e776f.

This PR was likely responsible for a relatively large regression in
dist-x86_64-msvc-alt builder times, from approximately 1.7 to 2.8 hours,
bringing that builder into the pool of the slowest builders we currently have.

This seems to be limited to the alt builder due to needing parallel-compiler
enabled, likely leading to slow LLVM compilation for some reason. See some
investigation in [this Zulip stream](https://rust-lang.zulipchat.com/#narrow/stream/242791-t-infra/topic/msvc.28.3F.29.20builders.20running.20much.20slower).

cc `@lcnr` `@oli-obk` `@b-naber` (per original PRs review/author)

We can re-apply this PR once the regression is fixed, but it is sufficiently large that I don't think keeping this on master is viable in the meantime unless there's a very strong case to be made for it. Alternatively, we can disable that builder (it's not critical since it's an alt build), but that obviously carries its own costs.
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