Enable building/disting standard library in stage 0 #145876

Kobzol · 2025-08-26T07:50:59Z

After the stage0 redesign, building a stage0 library no longer is a thing, because the stage0 compiler normally cannot build libstd anymore. However, there are valid use-cases for having the ability to quickly cross-compile libstd for different targets, when the stage0 compiler is e.g. a stable released version, and you want to cross-compile libstd from the same sources of that compiler.

This PR allows that, as long as you set build.local-rebuild = true, which promises bootstrap that the stage0 compiler actually comes from in-tree sources, and can thus compile libstd.

The change needed to enable this is very minimal, so I think that it is worth it to allow this use-case to work.

Fixes: #145587
Fixes: #145859
Related issue: #94781

r? @jieyouxu

rustbot · 2025-08-26T07:51:05Z

This PR modifies src/bootstrap/src/core/config.

If appropriate, please update CONFIG_CHANGE_HISTORY in src/bootstrap/src/utils/change_tracker.rs.

jieyouxu · 2025-08-26T12:01:35Z

This unfortunately has a merge conflict. I'll review this tmrw.

jieyouxu

Actually just kidding, the changes look good to me. Please r=me after fixing the change tracker conflict.

View changes since this review

jieyouxu · 2025-08-26T12:05:43Z

@rustbot author

bors · 2025-08-26T12:55:52Z

☔ The latest upstream changes (presumably #145871) made this pull request unmergeable. Please resolve the merge conflicts.

rustbot · 2025-08-26T20:29:26Z

This PR was rebased onto a different master commit. Here's a range-diff highlighting what actually changed.

Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers.

Kobzol · 2025-08-26T20:47:02Z

@bors r=jieyouxu

bors · 2025-08-26T20:47:05Z

📌 Commit 5cf9c13 has been approved by jieyouxu

It is now in the queue for this repository.

Rollup of 9 pull requests Successful merges: - #144499 (ci: Begin running ui tests with `rust.debuginfo-level-tests=1`) - #145790 (Improve dist for gnullvm hosts) - #145792 (Use attribute name in message for "outer attr used as inner attr" errors) - #145840 (rustc_codegen_ssa: More comprehensive RISC-V ELF flags) - #145876 (Enable building/disting standard library in stage 0) - #145887 (bootstrap: Don't panic if codegen-backends is set to empty) - #145888 (platform-support: Fix LoongArch32 host column) - #145892 (add a flag to codegen fn attrs for foreign items) - #145901 (Fix typo in comment of library/alloc/src/raw_vec/mod.rs) r? `@ghost` `@rustbot` modify labels: rollup

Rollup merge of #145876 - Kobzol:dist-std-build, r=jieyouxu Enable building/disting standard library in stage 0 After the stage0 redesign, building a stage0 library no longer is a thing, because the stage0 compiler normally cannot build libstd anymore. However, there are valid use-cases for having the ability to quickly cross-compile libstd for different targets, when the stage0 compiler is e.g. a stable released version, and you want to cross-compile libstd from the same sources of that compiler. This PR allows that, as long as you set `build.local-rebuild = true`, which promises bootstrap that the stage0 compiler actually comes from in-tree sources, and can thus compile libstd. The change needed to enable this is very minimal, so I think that it is worth it to allow this use-case to work. Fixes: #145587 Fixes: #145859 Related issue: #94781 r? `@jieyouxu`

Rollup of 9 pull requests Successful merges: - rust-lang/rust#144499 (ci: Begin running ui tests with `rust.debuginfo-level-tests=1`) - rust-lang/rust#145790 (Improve dist for gnullvm hosts) - rust-lang/rust#145792 (Use attribute name in message for "outer attr used as inner attr" errors) - rust-lang/rust#145840 (rustc_codegen_ssa: More comprehensive RISC-V ELF flags) - rust-lang/rust#145876 (Enable building/disting standard library in stage 0) - rust-lang/rust#145887 (bootstrap: Don't panic if codegen-backends is set to empty) - rust-lang/rust#145888 (platform-support: Fix LoongArch32 host column) - rust-lang/rust#145892 (add a flag to codegen fn attrs for foreign items) - rust-lang/rust#145901 (Fix typo in comment of library/alloc/src/raw_vec/mod.rs) r? `@ghost` `@rustbot` modify labels: rollup

Reference: rust-lang#145876 Disabled from here: rust-lang@52882f6

OctopusET · 2025-09-12T21:11:16Z

I made a patch for 1.89.0
OctopusET@b1b6c0a

OctopusET · 2025-09-12T21:13:49Z

Will this be included in 1.90.0 too?

Kobzol · 2025-09-12T21:15:03Z

No, it will be in 1.91.0.

Rust changed bootstrap design since version 1.89.0, and it doesn't build stage0 stdlib anymore: https://blog.rust-lang.org/inside-rust/2025/05/29/redesigning-the-initial-bootstrap-sequence/ This upstream PR will fix the issue: rust-lang/rust#145876 Closes: https://bugs.gentoo.org/962786 Signed-off-by: Sungjoon Moon <[email protected]>

Rust changed bootstrap design since version 1.89.0, and it doesn't build stage0 stdlib anymore: https://blog.rust-lang.org/inside-rust/2025/05/29/redesigning-the-initial-bootstrap-sequence/ This upstream PR will fix the issue from 1.91.0: rust-lang/rust#145876 Closes: https://bugs.gentoo.org/962786 Signed-off-by: Sungjoon Moon <[email protected]>

Rust changed bootstrap design since version 1.89.0, and it doesn't build stage0 stdlib anymore: https://blog.rust-lang.org/inside-rust/2025/05/29/redesigning-the-initial-bootstrap-sequence/ This upstream PR will fix the issue from 1.91.0: rust-lang/rust#145876 Closes: https://bugs.gentoo.org/962786 Signed-off-by: Sungjoon Moon <[email protected]> Part-of: #43765 Closes: #43765 Signed-off-by: Sam James <[email protected]>

rustbot assigned jieyouxu Aug 26, 2025

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 Aug 26, 2025

Kobzol force-pushed the dist-std-build branch from 2f0ac20 to 8d0b1e4 Compare August 26, 2025 07:51

Kobzol mentioned this pull request Aug 26, 2025

Build stage 0 rust-std from rust-src with local rust #145859

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jieyouxu approved these changes Aug 26, 2025

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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 Aug 26, 2025

Kobzol force-pushed the dist-std-build branch from 8d0b1e4 to 0013bcf Compare August 26, 2025 13:07

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Kobzol force-pushed the dist-std-build branch from 0013bcf to 694b14c Compare August 26, 2025 13:08

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Enable building/disting standard library in stage 0

5cf9c13

Kobzol force-pushed the dist-std-build branch from 694b14c to 5cf9c13 Compare August 26, 2025 20:29

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 Aug 26, 2025

samueltardieu mentioned this pull request Aug 26, 2025

Rollup of 9 pull requests #145906

Merged

bors merged commit 5ba3bfc into rust-lang:master Aug 27, 2025
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rustbot added this to the 1.91.0 milestone Aug 27, 2025

Kobzol deleted the dist-std-build branch August 27, 2025 05:15

OctopusET mentioned this pull request Sep 12, 2025

Cross-compile bootstrap doesn't generating any library files on 1.89.0 #146475

Closed

OctopusET added a commit to OctopusET/rust that referenced this pull request Sep 12, 2025

Enable building/disting standard library in stage 0

b1b6c0a

Reference: rust-lang#145876 Disabled from here: rust-lang@52882f6

OctopusET mentioned this pull request Sep 12, 2025

sys-devel/rust-std: Enable stage 0 build for 1.89.0 gentoo/gentoo#43765

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