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authorbors <bors@rust-lang.org>2023-11-06 07:41:22 +0000
committerbors <bors@rust-lang.org>2023-11-06 07:41:22 +0000
commitf9b644636f8c74d1d9a3283dc65a6a6f02a97718 (patch)
treef65a6587731b5e65557dd9d9cbf0c6526503b8b8 /compiler/rustc_parse/src
parentfcca978aa0c9a7443649305dd0ed48c4691a1e89 (diff)
parentf2a40e99ffcb8620634ba73ebf4a2b7d77661874 (diff)
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Auto merge of #117435 - SparrowLii:nightly_parallel, r=oli-obk,davidtwco
enable parallel rustc front end in nightly builds

Refers to the [MCP](https://github.com/rust-lang/compiler-team/issues/681), this pr does:
1. Enable the parallel front end in nightly builds, and keep the default number of threads as 1. Then users can use the parallel rustc front end via -Z threads=n option.

2. Set it up to serial front end for beta/stable builds via bootstrap.

3. Switch over the alt builders from parallel rustc to serial, so we have artifacts without parallel to test against the artifacts with parallel.

r? `@oli-obk`

cc `@cjgillot` `@nnethercote` `@bjorn3` `@Kobzol`
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