bootstrap: Remove obsolete option `build.compiletest-use-stage0-libtest` by Zalathar · Pull Request #159878 · rust-lang/rust

Zalathar · 2026-07-25T03:46:47Z

During the bootstrap stage0 redesign, compiletest-use-stage0-libtest was needed as a workaround for big regressions in compiletest build times, due to compiletest's dependency on libtest or #![feature(internal_output_capture)].

As of #146929, compiletest has no dependency on libtest or any unstable features, and is always built with the stage0 compiler. Since then, compiletest-use-stage0-libtest has had no effect, and was retained only to avoid breaking people's builds if they had that option set.

Several months later, it should be fine to remove the option entirely.

r? jieyouxu (or bootstrap)

rustbot · 2026-07-25T03:46:50Z

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

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

rustbot · 2026-07-25T03:46:52Z

jieyouxu is currently at their maximum review capacity.
They may take a while to respond.

Kobzol · 2026-07-25T07:58:40Z

Thanks!

@bors r+ rollup

rust-bors · 2026-07-25T07:58:43Z

📌 Commit c9e2429 has been approved by Kobzol

It is now in the queue for this repository.

bootstrap: Remove obsolete option `build.compiletest-use-stage0-libtest` During the bootstrap stage0 redesign, `compiletest-use-stage0-libtest` was needed as a workaround for big regressions in compiletest build times, due to compiletest's dependency on libtest or `#![feature(internal_output_capture)]`. As of rust-lang#146929, compiletest has no dependency on libtest or any unstable features, and is always built with the stage0 compiler. Since then, `compiletest-use-stage0-libtest` has had no effect, and was retained only to avoid breaking people's builds if they had that option set. Several months later, it should be fine to remove the option entirely. r? jieyouxu (or bootstrap)

Rollup of 23 pull requests Successful merges: - #159720 (document #[global_allocator] constraints) - #159732 (optimization: don't look for diagnostic/canonical items without rustc_attrs enabled) - #159738 (implement `CovariantUnsafeCell`) - #159740 (reuse regular exported_non_generic_symbols logic in Miri) - #159780 (check `extern "custom"` function pointers) - #159786 (rustdoc-js: ignore editor temp files in test folder discovery) - #159819 (std::sync::poison: disable auto_cfg on PoisonError::new) - #155388 (stepping into where-clauses during normalization may be productive) - #155914 (when bailing on ambiguity, don't force other results to ambig) - #159204 (Add support to caller_location to rustc_public) - #159411 ([rustdoc] Correctly handle output options with --show-coverage) - #159439 (Fix(lib/fs/win): Fall back on Win32 delete for `Dir::remove_file`) - #159676 (Update wasm-component-ld to 0.5.27) - #159730 (allow accessing the contents of UnsafeCell without going through get) - #159809 (Avoid `#[target_features]`) - #159810 (Add tuple never coercion collection regression test) - #159826 (Remove redundant `#[rustc_paren_sugar]` feature gate) - #159853 (Updated expect messages for `CString` struct and method documentation) - #159877 (Revert "Export `derive` at `core::derive` and `std::derive`") - #159878 (bootstrap: Remove obsolete option `build.compiletest-use-stage0-libtest`) - #159882 (Update expect messages in library/alloc/boxed.rs and library/alloc/string.rs to follow the style guide) - #159891 (Split multiline derives into std/rustc macros) - #159895 (rustc-dev-guide subtree update)

bootstrap: Remove obsolete option `build.compiletest-use-stage0-libtest` During the bootstrap stage0 redesign, `compiletest-use-stage0-libtest` was needed as a workaround for big regressions in compiletest build times, due to compiletest's dependency on libtest or `#![feature(internal_output_capture)]`. As of rust-lang#146929, compiletest has no dependency on libtest or any unstable features, and is always built with the stage0 compiler. Since then, `compiletest-use-stage0-libtest` has had no effect, and was retained only to avoid breaking people's builds if they had that option set. Several months later, it should be fine to remove the option entirely. r? jieyouxu (or bootstrap)

Rollup of 23 pull requests Successful merges: - #159673 (bootstrap: forward -fdebug-prefix-map when using cc) - #159720 (document #[global_allocator] constraints) - #159732 (optimization: don't look for diagnostic/canonical items without rustc_attrs enabled) - #159738 (implement `CovariantUnsafeCell`) - #159740 (reuse regular exported_non_generic_symbols logic in Miri) - #159780 (check `extern "custom"` function pointers) - #159786 (rustdoc-js: ignore editor temp files in test folder discovery) - #159819 (std::sync::poison: disable auto_cfg on PoisonError::new) - #155388 (stepping into where-clauses during normalization may be productive) - #155914 (when bailing on ambiguity, don't force other results to ambig) - #159204 (Add support to caller_location to rustc_public) - #159411 ([rustdoc] Correctly handle output options with --show-coverage) - #159439 (Fix(lib/fs/win): Fall back on Win32 delete for `Dir::remove_file`) - #159676 (Update wasm-component-ld to 0.5.27) - #159730 (allow accessing the contents of UnsafeCell without going through get) - #159809 (Avoid `#[target_features]`) - #159810 (Add tuple never coercion collection regression test) - #159826 (Remove redundant `#[rustc_paren_sugar]` feature gate) - #159853 (Updated expect messages for `CString` struct and method documentation) - #159878 (bootstrap: Remove obsolete option `build.compiletest-use-stage0-libtest`) - #159882 (Update expect messages in library/alloc/boxed.rs and library/alloc/string.rs to follow the style guide) - #159891 (Split multiline derives into std/rustc macros) - #159895 (rustc-dev-guide subtree update)

bootstrap: Remove obsolete option `build.compiletest-use-stage0-libtest` During the bootstrap stage0 redesign, `compiletest-use-stage0-libtest` was needed as a workaround for big regressions in compiletest build times, due to compiletest's dependency on libtest or `#![feature(internal_output_capture)]`. As of rust-lang#146929, compiletest has no dependency on libtest or any unstable features, and is always built with the stage0 compiler. Since then, `compiletest-use-stage0-libtest` has had no effect, and was retained only to avoid breaking people's builds if they had that option set. Several months later, it should be fine to remove the option entirely. r? jieyouxu (or bootstrap)

rustbot · 2026-07-26T03:02:02Z

This PR was rebased onto a different main 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.

Zalathar · 2026-07-26T03:02:54Z

Rebased over change_tracker.rs conflict.

@bors r=Kobzol

rust-bors · 2026-07-26T03:02:57Z

📌 Commit baa03e9 has been approved by Kobzol

It is now in the queue for this repository.

🌲 The tree is currently closed for pull requests below priority 100. This pull request will be tested once the tree is reopened.

Reason for tree closure: spurious failures

Rollup of 25 pull requests Successful merges: - #138618 (Support using const pointers in asm `const` operand) - #157962 (Lower paths to functions in const args as ConstKind::Error) - #158709 (rustdoc: warn on improperly interleaved HTML/MD) - #159174 (Fix implicit_provenance_casts warnings on Xous) - #159179 (enable `unreachable_cfg_select_predicates` lint as part of `unused` lint group) - #159518 (iter: extend step_by specialization to cover StepBy<RangeIter<{integer}>>) - #159673 (bootstrap: forward -fdebug-prefix-map when using cc) - #159700 (Split non-local `semicolon_in_expressions_from_macros` into a separate lint) - #159720 (document #[global_allocator] constraints) - #159732 (optimization: don't look for diagnostic/canonical items without rustc_attrs enabled) - #159738 (implement `CovariantUnsafeCell`) - #159740 (reuse regular exported_non_generic_symbols logic in Miri) - #159780 (check `extern "custom"` function pointers) - #159786 (rustdoc-js: ignore editor temp files in test folder discovery) - #159819 (std::sync::poison: disable auto_cfg on PoisonError::new) - #152439 (Fix typos and grammar in library documentation) - #155388 (stepping into where-clauses during normalization may be productive) - #155914 (when bailing on ambiguity, don't force other results to ambig) - #159204 (Add support to caller_location to rustc_public) - #159439 (Fix(lib/fs/win): Fall back on Win32 delete for `Dir::remove_file`) - #159676 (Update wasm-component-ld to 0.5.27) - #159695 (proc_macro: Fix cfg_attr inner attrs in file modules) - #159730 (allow accessing the contents of UnsafeCell without going through get) - #159809 (Avoid `#[target_features]`) - #159878 (bootstrap: Remove obsolete option `build.compiletest-use-stage0-libtest`)

Rollup merge of #159878 - Zalathar:stage0-libtest, r=Kobzol bootstrap: Remove obsolete option `build.compiletest-use-stage0-libtest` During the bootstrap stage0 redesign, `compiletest-use-stage0-libtest` was needed as a workaround for big regressions in compiletest build times, due to compiletest's dependency on libtest or `#![feature(internal_output_capture)]`. As of #146929, compiletest has no dependency on libtest or any unstable features, and is always built with the stage0 compiler. Since then, `compiletest-use-stage0-libtest` has had no effect, and was retained only to avoid breaking people's builds if they had that option set. Several months later, it should be fine to remove the option entirely. r? jieyouxu (or bootstrap)

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 25, 2026

rustbot assigned jieyouxu Jul 25, 2026

Zalathar force-pushed the stage0-libtest branch from 477d1de to c9e2429 Compare July 25, 2026 03:47

rust-bors Bot 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-review Status: Awaiting review from the assignee but also interested parties. labels Jul 25, 2026

jieyouxu assigned Kobzol and unassigned jieyouxu Jul 25, 2026

GuillaumeGomez mentioned this pull request Jul 25, 2026

Rollup of 23 pull requests #159903

Closed

GuillaumeGomez mentioned this pull request Jul 25, 2026

Rollup of 23 pull requests #159905

Closed

JonathanBrouwer mentioned this pull request Jul 25, 2026

Rollup of 15 pull requests #159925

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rust-bors Bot 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-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. labels Jul 25, 2026

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Remove obsolete option build.compiletest-use-stage0-libtest

baa03e9

Zalathar force-pushed the stage0-libtest branch from c9e2429 to baa03e9 Compare July 26, 2026 03:01

rust-bors Bot 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 26, 2026

jhpratt mentioned this pull request Jul 26, 2026

Rollup of 25 pull requests #159942

Merged

rust-bors Bot merged commit 9e1ee5e into rust-lang:main Jul 26, 2026
13 checks passed

rustbot added this to the 1.99.0 milestone Jul 26, 2026

Zalathar deleted the stage0-libtest branch July 26, 2026 10:50

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bootstrap: Remove obsolete option `build.compiletest-use-stage0-libtest`#159878

bootstrap: Remove obsolete option `build.compiletest-use-stage0-libtest`#159878
rust-bors[bot] merged 1 commit into
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