cg_gcc subtree sync #149348

GuillaumeGomez · 2025-11-26T10:33:50Z

…update_cg_gcc_2025-11-04

Improve type safety by using an enum rather than strings.

…ature This way warnings are emitted even in a check build.

Previously it was rather inconsistent which crates got the rust logo and which didn't and setting html_root_url was forgotten in many cases.

Replace `allow` attributes with `expect` and remove unused attributes

…ements, r=WaffleLapkin Move warning reporting from flag_to_backend_features to cfg_target_feature This way warnings are emitted even in a check build.

…iaskrgr Rollup of 8 pull requests Successful merges: - rust-lang#147994 (Deduplicate deprecation warning when using unit or tuple structs) - rust-lang#148440 ([rustdoc search] Simplify itemTypes and filter "dependencies") - rust-lang#148501 (triagebot: Create Zulip topics for libs backports) - rust-lang#148517 (Remove no longer necessary lint allow) - rust-lang#148518 (Unify the configuration of the compiler docs) - rust-lang#148523 (miri subtree update) - rust-lang#148525 (Fix ICE from lit_to_mir_constant caused by type error) - rust-lang#148534 (Merge `Vec::push{,_mut}_within_capacity`) r? `@ghost` `@rustbot` modify labels: rollup

This implements a new unstable compiler flag `-Zannotate-moves` that makes move and copy operations visible in profilers by creating synthetic debug information. This is achieved with zero runtime cost by manipulating debug info scopes to make moves/copies appear as calls to `compiler_move<T, SIZE>` and `compiler_copy<T, SIZE>` marker functions in profiling tools. This allows developers to identify expensive move/copy operations in their code using standard profiling tools, without requiring specialized tooling or runtime instrumentation. The implementation works at codegen time. When processing MIR operands (`Operand::Move` and `Operand::Copy`), the codegen creates an `OperandRef` with an optional `move_annotation` field containing an `Instance` of the appropriate profiling marker function. When storing the operand, `store_with_annotation()` wraps the store operation in a synthetic debug scope that makes it appear inlined from the marker. Two marker functions (`compiler_move` and `compiler_copy`) are defined in `library/core/src/profiling.rs`. These are never actually called - they exist solely as debug info anchors. Operations are only annotated if the type: - Meets the size threshold (default: 65 bytes, configurable via `-Zannotate-moves=SIZE`) - Has a non-scalar backend representation (scalars use registers, not memcpy) This has a very small size impact on object file size. With the default limit it's well under 0.1%, and even with a very small limit of 8 bytes it's still ~1.5%. This could be enabled by default.

…_2025-11-04, r=GuillaumeGomez Sync rustc_codegen_gcc subtree cc `@antoyo` r? ghost

…1_13 Sync from rust 2025/11/13

Clarify -Cllvm-args forwarding to GCC in Readme

…1_24 Update to nightly-2025-11-24

Dlopen libgccjit.so in order to support multiple targets more easily

This will be useful for the unification work of the handling of the library between all Rust setups.

…root Move libgccjit.so in the sysroot

…update_cg_gcc_2025-11-26

rustbot · 2025-11-26T19:11:52Z

⚠️ Warning ⚠️

Some commits in this PR modify submodules.

If this was not intentional, see I changed a submodule on accident in the rustc dev guide.
The following commits have merge commits (commits with multiple parents) in your changes. We have a no merge policy so these commits will need to be removed for this pull request to be merged.
- 2b0da9b
- 3e1d537
- 55171cf
- 709f1cf
- 7ba799d
- 7d3a456
- 9d4c385
- 9fce61b
- a9a8a9e
- db67f59
- f25ac1d
- fdf04df
You can start a rebase with the following commands:
```
$ # rebase
$ git pull --rebase https://github.com/rust-lang/rust.git main
$ git push --force-with-lease
```

rustbot · 2025-11-27T16:59:57Z

This PR changes how GCC is built. Consider updating src/bootstrap/download-ci-gcc-stamp.

src/bootstrap/src/core/build_steps/gcc.rs

GuillaumeGomez · 2025-11-27T19:11:43Z

@bors r+ p=1 rollup=never

bors · 2025-11-27T19:11:46Z

📌 Commit f94e90f has been approved by GuillaumeGomez

It is now in the queue for this repository.

bors · 2025-11-28T01:53:27Z

⌛ Testing commit f94e90f with merge 10776a4...

bors · 2025-11-28T05:02:03Z

☀️ Test successful - checks-actions
Approved by: GuillaumeGomez
Pushing 10776a4 to main...

github-actions · 2025-11-28T05:05:23Z

What is this?

This is an experimental post-merge analysis report that shows differences in test outcomes between the merged PR and its parent PR.

Comparing e6edf3a (parent) -> 10776a4 (this PR)

Test differences

Show 4 test diffs

4 doctest diffs were found. These are ignored, as they are noisy.

Test dashboard

Run

cargo run --manifest-path src/ci/citool/Cargo.toml -- \
    test-dashboard 10776a4071b7ff4056bc8ae382d4a85d4be63cdb --output-dir test-dashboard

And then open test-dashboard/index.html in your browser to see an overview of all executed tests.

Job duration changes

x86_64-gnu-gcc: 3041.8s -> 3852.0s (+26.6%)
dist-aarch64-apple: 6200.3s -> 7710.8s (+24.4%)
aarch64-apple: 7363.9s -> 8835.0s (+20.0%)
dist-x86_64-apple: 6037.4s -> 7231.3s (+19.8%)
pr-check-1: 1664.5s -> 1932.1s (+16.1%)
i686-gnu-2: 5285.0s -> 6087.5s (+15.2%)
x86_64-gnu-llvm-20: 2454.7s -> 2816.7s (+14.7%)
i686-gnu-1: 7322.2s -> 8291.5s (+13.2%)
x86_64-gnu-llvm-20-1: 2971.6s -> 3309.5s (+11.4%)
armhf-gnu: 4954.2s -> 5479.1s (+10.6%)

How to interpret the job duration changes?

Job durations can vary a lot, based on the actual runner instance
that executed the job, system noise, invalidated caches, etc. The table above is provided
mostly for t-infra members, for simpler debugging of potential CI slow-downs.

rust-timer · 2025-11-28T06:24:09Z

Finished benchmarking commit (10776a4): comparison URL.

Overall result: no relevant changes - no action needed

@rustbot label: -perf-regression

Instruction count

This benchmark run did not return any relevant results for this metric.

Max RSS (memory usage)

Results (primary -0.6%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-0.6%	[-0.6%, -0.6%]	1
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-0.6%	[-0.6%, -0.6%]	1

Cycles

Results (primary 1.3%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	3.0%	[2.7%, 3.3%]	2
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-2.1%	[-2.1%, -2.1%]	1
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	1.3%	[-2.1%, 3.3%]	3

Binary size

This benchmark run did not return any relevant results for this metric.

Bootstrap: 472.955s -> 471.457s (-0.32%)
Artifact size: 386.96 MiB -> 386.89 MiB (-0.02%)

GuillaumeGomez and others added 30 commits November 4, 2025 16:01

Merge commit 'e785c50dad2944c7b4fb2d929de531f859db1e99' into subtree-…

b3f16fd

…update_cg_gcc_2025-11-04

rustc_target: introduce Arch

75f4028

Improve type safety by using an enum rather than strings.

rustc_target: allow unenumerated architectures

44b269d

Move warning reporting from flag_to_backend_features to cfg_target_fe…

a6ca4f5

…ature This way warnings are emitted even in a check build.

Unify the configuration of the compiler docs

3a7f4c4

Previously it was rather inconsistent which crates got the rust logo and which didn't and setting html_root_url was forgotten in many cases.

Replace allow attributes with expect and remove unused attributes

1548ba6

Only generate expect attribute if needed

884cea1

Merge pull request rust-lang#797 from GuillaumeGomez/clean-up-allow

f25ac1d

Replace `allow` attributes with `expect` and remove unused attributes

Auto merge of rust-lang#148516 - bjorn3:target_feature_parsing_improv…

2b0da9b

…ements, r=WaffleLapkin Move warning reporting from flag_to_backend_features to cfg_target_feature This way warnings are emitted even in a check build.

Auto merge of rust-lang#148481 - GuillaumeGomez:subtree-update_cg_gcc…

3e1d537

…_2025-11-04, r=GuillaumeGomez Sync rustc_codegen_gcc subtree cc `@antoyo` r? ghost

Merge branch 'master' into sync_from_rust_2025_11_13

7ba799d

Update to nightly-2025-11-13

0a7459b

Add --bypass-ignore-backends flag

95125dd

Add new failing UI tests

58684b3

Add back failing LTO tests

9dd009e

Remove passing UI test

4767bbf

Merge pull request rust-lang#800 from rust-lang/sync_from_rust_2025_1…

db67f59

…1_13 Sync from rust 2025/11/13

Clarify -Cllvm-args forwarding to GCC in Readme

2da6c16

docs: Move -Cllvm-args forwarding explanation to tips.md

e95bba1

Merge pull request rust-lang#803 from harin-ramesh/doc/issue-603

fdf04df

Clarify -Cllvm-args forwarding to GCC in Readme

Update to nightly-2025-11-24

99a3e75

Switch from #[expect] to #[allow] because of a clippy bug

35e02dd

Add failing UI tests

bd64989

Implement simd_masked_load and simd_masked_store

096b622

Add dummy mapping for new tile builtins

92f9994

Merge pull request rust-lang#804 from rust-lang/sync_from_rust_2025_1…

709f1cf

…1_24 Update to nightly-2025-11-24

Dlopen libgccjit.so in order to support multiple targets more easily

cfcd7eb

Merge pull request rust-lang#805 from rust-lang/feature/dlopen

a9a8a9e

Dlopen libgccjit.so in order to support multiple targets more easily

This comment has been minimized.

Sign in to view

antoyo and others added 4 commits November 26, 2025 12:52

Move libgccjit.so in the sysroot

2567d81

This will be useful for the unification work of the handling of the library between all Rust setups.

Merge pull request rust-lang#807 from rust-lang/move-libgccjit-in-sys…

55171cf

…root Move libgccjit.so in the sysroot

Merge commit '55171cfa8b53970e06dcd2f5f2e2b8d82eeb0885' into subtree-…

9fce61b

…update_cg_gcc_2025-11-26

Update GCC commit

9776f45

GuillaumeGomez force-pushed the subtree-update_cg_gcc_2025-11-26 branch from 6df9df9 to 9776f45 Compare November 26, 2025 18:44

This comment has been minimized.

Sign in to view

Update GCC submodule

15b6fde

This comment has been minimized.

Sign in to view

Remove the extra .0 at the end of the libgccjit.so file

c939e90

rustbot added the T-bootstrap Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap) label Nov 27, 2025

antoyo approved these changes Nov 27, 2025

View reviewed changes

src/bootstrap/src/core/build_steps/gcc.rs Outdated Show resolved Hide resolved

Remove outdated comment for libgccjit.so.0

f94e90f

bors added the merged-by-bors This PR was explicitly merged by bors. label Nov 28, 2025

bors merged commit 10776a4 into rust-lang:main Nov 28, 2025
12 checks passed

rustbot added this to the 1.93.0 milestone Nov 28, 2025

bors mentioned this pull request Nov 28, 2025

Bootstrap config: libgccjit libs dir #149354

Draft

GuillaumeGomez deleted the subtree-update_cg_gcc_2025-11-26 branch November 28, 2025 10:15

Provide feedback

Saved searches

Use saved searches to filter your results more quickly

Uh oh!

cg_gcc subtree sync #149348

cg_gcc subtree sync #149348

Uh oh!

GuillaumeGomez commented Nov 26, 2025

Uh oh!

This comment has been minimized.

This comment has been minimized.

This comment has been minimized.

rustbot commented Nov 26, 2025

Uh oh!

This comment has been minimized.

rustbot commented Nov 27, 2025

Uh oh!

Uh oh!

GuillaumeGomez commented Nov 27, 2025

Uh oh!

bors commented Nov 27, 2025

Uh oh!

bors commented Nov 28, 2025

Uh oh!

bors commented Nov 28, 2025

Uh oh!

Uh oh!

github-actions bot commented Nov 28, 2025

Uh oh!

rust-timer commented Nov 28, 2025

Uh oh!

Reviewers

Assignees

Labels

Projects

Milestone

Development

Uh oh!

11 participants

cg_gcc subtree sync #149348

cg_gcc subtree sync #149348

Uh oh!

Conversation

GuillaumeGomez commented Nov 26, 2025

Uh oh!

This comment has been minimized.

This comment has been minimized.

This comment has been minimized.

rustbot commented Nov 26, 2025

Uh oh!

This comment has been minimized.

rustbot commented Nov 27, 2025

Uh oh!

Uh oh!

GuillaumeGomez commented Nov 27, 2025

Uh oh!

bors commented Nov 27, 2025

Uh oh!

bors commented Nov 28, 2025

Uh oh!

bors commented Nov 28, 2025

Uh oh!

Uh oh!

github-actions bot commented Nov 28, 2025

Test differences

Job duration changes

Uh oh!

rust-timer commented Nov 28, 2025

Overall result: no relevant changes - no action needed

Instruction count

Max RSS (memory usage)

Cycles

Binary size

Uh oh!

Reviewers

Assignees

Labels

Projects

Milestone

Development

Uh oh!

11 participants