Use the in-tree `compiler-builtins` for the sysroot by tgross35 · Pull Request #141993 · rust-lang/rust

tgross35 · 2025-06-04T00:19:49Z

Many of std's dependency have a dependency on the crates.io compiler-builtins when used with the feature rustc-std-workspace-core. Use a Cargo patch to select the in-tree version instead.

compiler-builtins is also added as a dependency of rustc-std-workspace-core so these crates can remove their crates.io dependency in the future.

Zulip discussion: #t-compiler > Using in-tree compiler-builtins

Once this merges, the following PRs will need to make it to a release for the relevant crates:

Bump unicode-width to 0.2.0 getopts#119 (can merge at any time) released in v0.2.23
Remove optional dependency on compiler-builtins hashbrown#625 (can merge at any time) released in v0.15.4
Remove compiler-builtins from rustc-dep-of-std dependencies stdarch#1825
Remove compiler-builtins from rustc-dep-of-std dependencies rustc-demangle#80
Remove compiler-builtins from rustc-dep-of-std dependencies cfg-if#84
Remove compiler-builtins from rustc-dep-of-std dependencies unicode-rs/unicode-width#77

The above should cover all tier 1 targets with no std features enabled. The remaining cover the rest:

try-job: x86_64-gnu
try-job: test-various

compiler/rustc_metadata/src/creader.rs

library/compiler-builtins/compiler-builtins/Cargo.toml

WIP: Use the in-tree compiler-builtins for the sysroot Zulip discussion: [#t-compiler > Using in-tree compiler-builtins](https://rust-lang.zulipchat.com/#narrow/channel/131828-t-compiler/topic/Using.20in-tree.20compiler-builtins/with/522445336) try-job: x86_64-gnu try-job: test-various

WIP: Use the in-tree compiler-builtins for the sysroot Many of `std`'s dependency have a dependency on the crates.io `compiler-builtins` when used with the feature `rustc-std-workspace-core`. Use a Cargo patch to select the in-tree version instead. `compiler-builtins` is also added as a dependency of `rustc-std-workspace-core` so these crates can remove their crates.io dependency in the future. Zulip discussion: [#t-compiler > Using in-tree compiler-builtins](https://rust-lang.zulipchat.com/#narrow/channel/131828-t-compiler/topic/Using.20in-tree.20compiler-builtins/with/522445336) try-job: x86_64-gnu try-job: x86_64-gnu-aux try-job: test-various

tgross35 · 2025-06-04T22:30:27Z

I believe this works now. The first two commits are cherry picks that I will drop once #142036 merges.

r? @bjorn3

rust-bors · 2025-06-08T18:34:56Z

💔 Test failed

CI ❌

There are a few places that violate this lint, which showed up in rust-lang/rust CI (the relevent module is gated behind `kernel_user_helpers` which is only set for `armv4t`, `armv5te`, and `arm-linux-androideabi`; none of these are tested in compiler-builtins CI). Add new `unsafe { /* ... */ }` blocks where needed to address this. Some blocks should get a more thorough review of their preconditions, so their safety comments are left as `FIXME`s.

On the ILP32 `x86_64-unknown-linux-gnux32` target, `usize` is 32 bits so there is a sub-register alignment warning. Specify the 64-bit `r` registers, which matches the current default as well as the size of the other operands in the routines.

The `build.rs` entrypoint returns early for some targets, so emscripten and OpenBSD were not getting check-cfg set. Emit these earlier to avoid the `unexpected_cfgs` lint.

tgross35 · 2025-06-09T04:47:42Z

@bors2 try jobs=*various*

rust-bors · 2025-06-09T04:47:46Z

⌛ Trying commit fc71544 with merge fdbd817…

To cancel the try build, run the command @bors2 try cancel.

Use the in-tree `compiler-builtins` for the sysroot Many of `std`'s dependency have a dependency on the crates.io `compiler-builtins` when used with the feature `rustc-std-workspace-core`. Use a Cargo patch to select the in-tree version instead. `compiler-builtins` is also added as a dependency of `rustc-std-workspace-core` so these crates can remove their crates.io dependency in the future. Zulip discussion: [#t-compiler > Using in-tree compiler-builtins](https://rust-lang.zulipchat.com/#narrow/channel/131828-t-compiler/topic/Using.20in-tree.20compiler-builtins/with/522445336) Once this merges, the following PRs will need to make it to a release for the relevant crates: - rust-lang/getopts#119 (can merge at any time) - rust-lang/hashbrown#625 (can merge at any time) - rust-lang/stdarch#1825 - rust-lang/rustc-demangle#80 - rust-lang/cfg-if#84 - unicode-rs/unicode-width#77 The above should cover all tier 1 targets with no `std` features enabled. The remaining cover the rest: - alexcrichton/dlmalloc-rs#50 (wasm, xous, sgx) - gimli-rs/gimli#769 - r-efi/r-efi#89 (efi) - r-efi/r-efi-alloc#9 (efi) - fortanix/rust-sgx#770 (sgx) - hermit-os/hermit-rs#718 (hermit) - bytecodealliance/wasi-rs#108 (wasi) - gimli-rs/addr2line#345 - oyvindln/adler2#2 - BurntSushi/memchr#180 - Frommi/miniz_oxide#173 - gimli-rs/object#777 try-job: x86_64-gnu try-job: test-various try-job: `*various*`

rust-bors · 2025-06-09T07:05:40Z

☀️ Try build successful (CI)
Build commit: fdbd817 (fdbd817613720a9898edca037a613559e7090b4b)

tgross35 · 2025-06-09T07:07:46Z

Two small lint-related fixes on targets that aren't tested in compiler-builtins CI. I also locally checked that compiler-builtins builds without warning on all of rustc --print target-list.

@bors r=bjorn3

bors · 2025-06-09T07:07:49Z

📌 Commit fc71544 has been approved by bjorn3

It is now in the queue for this repository.

Since [1], this will come automatically from `rustc-std-workspace-core` and the crates.io dependency should no longer be specified. [1]: rust-lang/rust#141993

Rollup of 5 pull requests Successful merges: - #140767 (Stabilize `sha512`, `sm3` and `sm4` for x86) - #141001 (Make NonZero<char> possible) - #141993 (Use the in-tree `compiler-builtins` for the sysroot) - #142208 (Always consider `const _` items as live for dead code analysis) - #142238 (stabilize nonnull_provenance) r? `@ghost` `@rustbot` modify labels: rollup

Rollup merge of #141993 - tgross35:use-in-tree-builtins, r=bjorn3 Use the in-tree `compiler-builtins` for the sysroot Many of `std`'s dependency have a dependency on the crates.io `compiler-builtins` when used with the feature `rustc-std-workspace-core`. Use a Cargo patch to select the in-tree version instead. `compiler-builtins` is also added as a dependency of `rustc-std-workspace-core` so these crates can remove their crates.io dependency in the future. Zulip discussion: [#t-compiler > Using in-tree compiler-builtins](https://rust-lang.zulipchat.com/#narrow/channel/131828-t-compiler/topic/Using.20in-tree.20compiler-builtins/with/522445336) Once this merges, the following PRs will need to make it to a release for the relevant crates: - rust-lang/getopts#119 (can merge at any time) - rust-lang/hashbrown#625 (can merge at any time) - rust-lang/stdarch#1825 - rust-lang/rustc-demangle#80 - rust-lang/cfg-if#84 - unicode-rs/unicode-width#77 The above should cover all tier 1 targets with no `std` features enabled. The remaining cover the rest: - alexcrichton/dlmalloc-rs#50 (wasm, xous, sgx) - gimli-rs/gimli#769 - r-efi/r-efi#89 (efi) - r-efi/r-efi-alloc#9 (efi) - fortanix/rust-sgx#770 (sgx) - hermit-os/hermit-rs#718 (hermit) - bytecodealliance/wasi-rs#108 (wasi) - gimli-rs/addr2line#345 - oyvindln/adler2#2 - BurntSushi/memchr#180 - Frommi/miniz_oxide#173 - gimli-rs/object#777 try-job: x86_64-gnu try-job: test-various

tgross35 · 2025-06-09T21:40:06Z

Tracking the dependency updates at #142265

rustbot added A-compiler-builtins Area: compiler-builtins (https://github.com/rust-lang/compiler-builtins) T-libs Relevant to the library team, which will review and decide on the PR/issue. labels Jun 4, 2025

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tgross35 added the rla-silenced Silences rust-log-analyzer postings to the PR it's added on. label Jun 4, 2025

tgross35 mentioned this pull request Jun 4, 2025

Remove compiler-builtins from rustc-dep-of-std dependencies rust-lang/stdarch#1824

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rustbot added A-tidy Area: The tidy tool T-bootstrap Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap) labels Jun 4, 2025

bjorn3 reviewed Jun 4, 2025

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tgross35 force-pushed the use-in-tree-builtins branch 2 times, most recently from 94592d3 to 3c91330 Compare June 4, 2025 21:01

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tgross35 force-pushed the use-in-tree-builtins branch 2 times, most recently from e3edcc4 to 145c702 Compare June 4, 2025 22:28

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tgross35 changed the title ~~WIP: Use the in-tree compiler-builtins for the sysroot~~ Use the in-tree compiler-builtins for the sysroot Jun 4, 2025

tgross35 marked this pull request as ready for review June 4, 2025 22:30

rustbot assigned workingjubilee Jun 4, 2025

tgross35 added 3 commits June 9, 2025 04:46

compiler-builtins: Emit rustc-check-cfg earlier

fc71544

The `build.rs` entrypoint returns early for some targets, so emscripten and OpenBSD were not getting check-cfg set. Emit these earlier to avoid the `unexpected_cfgs` lint.

tgross35 force-pushed the use-in-tree-builtins branch from 448db09 to fc71544 Compare June 9, 2025 04:47

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-review Status: Awaiting review from the assignee but also interested parties. labels Jun 9, 2025

tgross35 mentioned this pull request Jun 9, 2025

Rollup of 5 pull requests #142253

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tgross35 mentioned this pull request Jun 9, 2025

Remove crates.io compiler-builtins from the library workspace #142265

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bors merged commit ab87ed1 into rust-lang:master Jun 9, 2025
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rustbot added this to the 1.89.0 milestone Jun 9, 2025

tgross35 mentioned this pull request Jun 28, 2025

Sync from rust 2025/06/28 rust-lang/rustc_codegen_gcc#723

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cyrgani mentioned this pull request Jun 29, 2025

presence of compiler_builtins in the std doc crate sidebar on beta #143215

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dtolnay mentioned this pull request Aug 20, 2025

Update to Rust 1.89.0 dtolnay/buck2-rustc-bootstrap#21

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This was referenced Feb 26, 2026

docs: Cargo.toml - Update rustc dep upstream reference sunfishcode/rustix-dlmalloc#5

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docs: Cargo.toml - Revise description of core dep alexcrichton/dlmalloc-rs#63

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