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Fix --skip-std-check-if-no-download-rustc #143707

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@Kobzol Kobzol commented Jul 9, 2025

Since #143048, we now explicitly set the build compiler for check::Std, which caused it to be built before we checked --skip-std-check-if-no-download-rustc. So I moved the check earlier to make_run, which resolves it.

I also added a regression test for this. Sadly we can't really test for the positive case easily (when download-ci-rustc is enabled), but we can test the negative cases, where it is disabled.

Fixes: #143705

r? @RalfJung

@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-bootstrap Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap) labels Jul 9, 2025
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RalfJung commented Jul 9, 2025

Thanks a lot for the quick fix. :)
However, sorry, I can't review this code, I don't understand any of it.^^

r? bootstrap

@rustbot rustbot assigned albertlarsan68 and unassigned RalfJung Jul 9, 2025
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Kobzol commented Jul 9, 2025

r? @jieyouxu

@rustbot rustbot assigned jieyouxu and unassigned albertlarsan68 Jul 9, 2025
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Thanks, r=me after nit

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@rustbot rustbot added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Jul 10, 2025
Since rust-lang#143048, we now explicitly set the build compiler for `check::Std`, which caused it to be built before we checked `--skip-std-check-if-no-download-rustc`. So I moved the check earlier to `make_run`, which resolves it.

I also added a regression test for this. Sadly we can't really test for the positive case easily (when download-ci-rustc is enabled), but we can test the negative cases, where it is disabled.
@Kobzol Kobzol force-pushed the bootstrap-std-check branch from f65c6c7 to 3e675f4 Compare July 10, 2025 06:20
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Kobzol commented Jul 10, 2025

@bors r=jieyouxu

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bors commented Jul 10, 2025

📌 Commit 3e675f4 has been approved by jieyouxu

It is now in the queue for this repository.

@bors bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Jul 10, 2025
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./x check library --stage 1 --skip-std-check-if-no-download-rustc builds rustc
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