`rustc_codegen_gcc` subtree update by GuillaumeGomez · Pull Request #162499 · rust-lang/rust

GuillaumeGomez · 2026-09-08T20:33:51Z

r? antoyo

This gives the asm-const code the basic ability to deal wiht pointer and provenances, which lays the ground work for asm_const_ptr. Note that `SymStatic` is not fully removed, a specialized is kept and renamed as `SymThreadLocalStatic`, for `#[thread_local]` statics where CTFE does not support naming. The `#[thread_local]` is unstable feature and it's not clear if we want to support this in `sym`, but removal of it should be a separate PR.

With the previous commit, now we can see there are some code duplication for the handling of `GlobalAlloc` inside backends. Do some clean up to unify them.

This will allow introducing a separate incr comp session dir for the post LTO artifacts in the future. In addition it statically encodes the lifetime of the incr comp session rather than requiring an enum behind a mutex stored in the Session.

Support using const pointers in asm `const` operand Implements [RFC#3848](rust-lang/rfcs#3848) with tracking issue rust-lang#128464 This adds support of const pointers for asm `const` in addition to plain integers. The inline `asm!` support is implemented using `i` constraint, and the `global_asm!` and `naked_asm!` support is implemented by inserting `symbol + offset` and make `symbol` compiler-used. For unnamed consts, it will create additional internal & hidden symbols so that they can be referenced by global_asm. ~~The feature is also implemented for GCC backend but it's untested.~~ Tested now.

…-uninit constants" This reverts commit ed9de1e.

…ics.rs`

@JonathanBrouwer

…nathanBrouwer Rename `errors.rs` file to `diagnostics.rs` (15/N) Follow-up of rust-lang#157485. r? @JonathanBrouwer

This is already *supposed* to be impossible in layout, but this emphasizes that better. Ironically I was inspired to do this as part of looking at making `Simd<T, 0>` *work*, but importantly if that's going to happen I think it should be `BackendRepr::Memory` like other ZSTs, *not* a `BackendRepr::ScalarVector` that would need to carry around a useless LLVM value in `OperandValue::Immediate` (where it's not even clear what the LLVM type of that value would be).

Structurally prevent zero-count `BackendRepr::SimdVector`s This is already *supposed* to be impossible in layout, but this emphasizes that better. This PR makes no behaviour changes; just `BackendLaneCount` instead of `u64` in https://doc.rust-lang.org/nightly/nightly-rustc/rustc_abi/enum.BackendRepr.html Ironically I was inspired to do this as part of [looking at making `Simd<T, 0>` *work*](https://rust-lang.zulipchat.com/#narrow/channel/257879-project-portable-simd/topic/Allow.20N.3D.3D0.3F/with/613345298), but importantly if that's going to happen I think it should be `BackendRepr::Memory` like other ZSTs, *not* a `BackendRepr::ScalarVector` that would need to carry around a useless LLVM value in `OperandValue::Immediate` (where it's not even clear what the LLVM type of that value would be).

…ind tables

Only emit -fno-asynchronous-unwind-tables when we should not emit unwind tables

…e_cg_gcc_2026-07-24, r=GuillaumeGomez" This reverts commit 5048696, reversing changes made to 7c329d6.

…8_04 Sync from rust 2026/08/04

…oli-obk Split IncrCompSession out of Session This will allow introducing a separate incr comp session dir for the post LTO artifacts in the future. In addition it statically encodes the lifetime of the incr comp session rather than requiring an enum behind a mutex stored in the Session. Based on rust-lang#159000 Part of rust-lang/compiler-team#908

doc/tips.md links to ./doc/gimple.md, but tips.md is itself inside doc/, so the link resolves to doc/doc/gimple.md and 404s. The file sits next to it. Readme.md links to ./doc/debugging-gcc-lto.md. That file was added in 79316d4 and removed again in 79a6e4e, which replaced it with the broader doc/debugging.md; the Readme entry was not updated. The GCC LTO material is still there, as the first section of that file. CONTRIBUTING.md already refers to it as [Debugging](doc/debugging.md), so the Readme entry now matches that name.

Remove passing tests from failing-ui-tests.txt

Fix two broken links in the docs

JonathanBrouwer · 2026-09-19T05:59:40Z

@bors rollup=never historic issues

…08, r=antoyo `rustc_codegen_gcc` subtree update r? antoyo

rust-bors · 2026-09-19T13:53:48Z

💔 Test for 4b31130 failed: CI. Failed job:

auto - dist-x86_64-linux (web logs, enhanced plaintext logs)

@antoyo

Use newer `make` version when building GCC Needed for rust-lang#162499. One day we'll finish this sync... :') cc @antoyo r? @Kobzol

@antoyo

Rollup merge of #163031 - GuillaumeGomez:update-make, r=Kobzol Use newer `make` version when building GCC Needed for #162499. One day we'll finish this sync... :') cc @antoyo r? @Kobzol

Kobzol · 2026-09-22T07:53:44Z

@bors r=antoyo

Let's try again after #163031, the queue is mostly empty anyway.

rust-bors · 2026-09-22T07:53:48Z

📌 Commit cf4bee6 has been approved by antoyo

It is now in the queue for this repository.

A failed build status on this PR was cleared due to the approval.

rust-bors · 2026-09-22T11:15:07Z

☀️ Test successful - CI
Approved by: antoyo
Duration: 3h 6m 27s
Pushing c64de18 to main...

github-actions · 2026-09-22T11:18:16Z

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 e5b9509 (parent) -> c64de18 (this PR)

Test differences

Show 8 test diffs

Stage 2

[run-make] tests/run-make/comment-section: pass -> ignore (gcc backend is marked as ignore) (J0)
[run-make] tests/run-make/dirty-incr-due-to-hard-link: pass -> ignore (gcc backend is marked as ignore) (J0)
[run-make] tests/run-make/emit: pass -> ignore (gcc backend is marked as ignore) (J0)
[run-make] tests/run-make/extra-filename-with-temp-outputs: pass -> ignore (gcc backend is marked as ignore) (J0)
[run-make] tests/run-make/parallel-reproducible-build: pass -> ignore (gcc backend is marked as ignore) (J0)
[run-make] tests/run-make/parallel-reproducible-inline-asm-cookie: pass -> ignore (gcc backend is marked as ignore) (J0)

Additionally, 2 doctest diffs were found. These are ignored, as they are noisy.

Job group index

J0: test-x86_64-gnu-gcc

Test dashboard

Run

cargo run --manifest-path src/ci/citool/Cargo.toml -- \
    test-dashboard c64de18c55c70d62aa88a5722dea8f8e263bacf3 --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

test-various: 1h 23m -> 2h 10m (+56.6%)
test-x86_64-gnu-gcc-core-tests: 10m 41s -> 16m 27s (+54.0%)
dist-x86_64-solaris: 1h 12m -> 1h 42m (+40.9%)
test-x86_64-msvc-ext3: 1h 56m -> 1h 11m (-38.7%)
test-x86_64-gnu-llvm-22-2: 1h 38m -> 1h (-38.5%)
test-x86_64-gnu-parallel-frontend: 1h 12m -> 1h 39m (+38.1%)
test-x86_64-gnu-miri: 1h 18m -> 49m 29s (-37.0%)
test-i686-msvc: 1h 54m -> 2h 36m (+36.8%)
optional-test-x86_64-gnu-autodiff: 53m 41s -> 34m 46s (-35.2%)
test-x86_64-gnu-debug: 2h 4m -> 1h 25m (-31.6%)

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.

@antoyo

Use newer `make` version when building GCC Needed for rust-lang/rust#162499. One day we'll finish this sync... :') cc @antoyo r? @Kobzol

bjorn3 · 2026-09-22T11:38:20Z

🎉 🥳 🚀

GuillaumeGomez · 2026-09-22T11:38:50Z

Finally! T_T

rust-timer · 2026-09-22T12:00:10Z

Finished benchmarking commit (c64de18): comparison URL.

Overall result: no relevant changes - no action needed

@rustbot label: -perf-regression

Instruction count

This perf run didn't have relevant results for this metric.

Max RSS (memory usage)

This perf run didn't have relevant results for this metric.

Cycles

Results (secondary 2.8%)

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)	2.8%	[2.8%, 2.8%]	1
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-	-	0

Binary size

This perf run didn't have relevant results for this metric.

Bootstrap: 487.336s -> 488.215s (0.18%)
Artifact size: 406.32 MiB -> 406.35 MiB (0.01%)

…_2026-09-08, r=antoyo `rustc_codegen_gcc` subtree update r? antoyo

Previously, in rust-lang#161972, this test was skipped on gcc, due to a bug in rustc_codegen_gcc. The bug was fixed by the subtree update at rust-lang#162499.

nbdd0121 and others added 30 commits July 22, 2026 13:47

Delay stringification of const to backend

8e8fedc

Unify handling of GlobalAlloc inside backend

8ad236c

With the previous commit, now we can see there are some code duplication for the handling of `GlobalAlloc` inside backends. Do some clean up to unify them.

Handle pointers with offset for asm const

c634dee

Generate unique symbol names if const pointers refer to promoted static

f71031d

Split IncrCompSession out of Session

9824c0e

This will allow introducing a separate incr comp session dir for the post LTO artifacts in the future. In addition it statically encodes the lifetime of the incr comp session rather than requiring an enum behind a mutex stored in the Session.

Revert "codegen: add OperandValue::Uninit to skip stores for entirely…

f15d69b

…-uninit constants" This reverts commit ed9de1e.

Rename rustc_codegen_gcc/errors.rs into `rustc_codegen_gcc/diagnost…

69336cf

…ics.rs`

Rollup merge of rust-lang#160148 - GuillaumeGomez:rename-errors, r=Jo…

4924fe7

…nathanBrouwer Rename `errors.rs` file to `diagnostics.rs` (15/N) Follow-up of rust-lang#157485. r? @JonathanBrouwer

Merge commit 'b3791c6305afd6ecc3e7f6232487f2bb31aed3e7'

9e90d80

Only emit -fno-asynchronous-unwind-tables when we should not emit unw…

9412bfb

…ind tables

Merge pull request rust-lang#939 from rust-lang/fix/emit-unwind-tables

129efcd

Only emit -fno-asynchronous-unwind-tables when we should not emit unwind tables

Revert "Auto merge of rust-lang#159844 - GuillaumeGomez:subtree-updat…

3e7fbda

…e_cg_gcc_2026-07-24, r=GuillaumeGomez" This reverts commit 5048696, reversing changes made to 7c329d6.

Merge branch 'master' into sync_from_rust_2026_08_04

8c9b4e6

Update to nightly-2026-08-04

0c7a1ac

Fix formatting

c4a0877

Fix copy of sysroot dependencies

23ff7bd

Add failing UI test

e85bf60

Merge pull request rust-lang#942 from rust-lang/sync_from_rust_2026_0…

1127416

…8_04 Sync from rust 2026/08/04

Remove passing tests from failing-ui-tests.txt

80cc13e

Add new failing LTO tests

dda9083

Merge pull request rust-lang#944 from rust-lang/remove-failing-tests

e2cf8d9

Remove passing tests from failing-ui-tests.txt

Merge pull request rust-lang#945 from kutsibalci/fix-broken-doc-links

0f16c3c

Fix two broken links in the docs

refactor handling of target features in Session

e9d0e58

Fix overaligned argument

56619f3

This comment has been minimized.

Sign in to view

rust-bors Bot pushed a commit that referenced this pull request Sep 19, 2026

Auto merge of #162499 - GuillaumeGomez:subtree-update_cg_gcc_2026-09-…

4b31130

…08, r=antoyo `rustc_codegen_gcc` subtree update r? antoyo

rust-bors Bot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. labels Sep 19, 2026

GuillaumeGomez mentioned this pull request Sep 19, 2026

Use newer make version when building GCC #163031

Merged

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 Sep 22, 2026

This comment has been minimized.

Sign in to view

This was referenced Sep 22, 2026

Rollup of 9 pull requests #163153

Closed

Rollup of 8 pull requests #163154

Closed

rust-bors Bot added merged-by-bors This PR was explicitly merged by bors. and removed S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. labels Sep 22, 2026

rust-bors Bot merged commit c64de18 into rust-lang:main Sep 22, 2026
14 checks passed

rustbot added this to the 1.100.0 milestone Sep 22, 2026

GuillaumeGomez deleted the subtree-update_cg_gcc_2026-09-08 branch September 22, 2026 11:38

theemathas mentioned this pull request Sep 24, 2026

Test #[track_caller] in async on gcc backend #163262

Open

JonathanBrouwer pushed a commit to JonathanBrouwer/rust that referenced this pull request Sep 24, 2026

Auto merge of rust-lang#162499 - GuillaumeGomez:subtree-update_cg_gcc…

6f61f25

…_2026-09-08, r=antoyo `rustc_codegen_gcc` subtree update r? antoyo

Navigation Menu

Uh oh!

`rustc_codegen_gcc` subtree update - #162499

`rustc_codegen_gcc` subtree update#162499
rust-bors[bot] merged 163 commits into
rust-lang:mainfrom
GuillaumeGomez:subtree-update_cg_gcc_2026-09-08

GuillaumeGomez commented Sep 8, 2026 •

edited by rustbot

Loading

Uh oh!

JonathanBrouwer commented Sep 19, 2026

Uh oh!

This comment has been minimized.

rust-bors Bot commented Sep 19, 2026

Uh oh!

Kobzol commented Sep 22, 2026

Uh oh!

rust-bors Bot commented Sep 22, 2026

Uh oh!

This comment has been minimized.

rust-bors Bot commented Sep 22, 2026

Uh oh!

Uh oh!

github-actions Bot commented Sep 22, 2026

Stage 2

Uh oh!

bjorn3 commented Sep 22, 2026

Uh oh!

GuillaumeGomez commented Sep 22, 2026

Uh oh!

rust-timer commented Sep 22, 2026

Uh oh!

Reviewers

Assignees

Labels

Projects

Milestone

Development

Uh oh!

20 participants

Uh oh!

Conversation

GuillaumeGomez commented Sep 8, 2026 • edited by rustbot Loading Uh oh! There was an error while loading. Please reload this page.

Uh oh!

Uh oh!

JonathanBrouwer commented Sep 19, 2026

Uh oh!

This comment has been minimized.

rust-bors Bot commented Sep 19, 2026

Uh oh!

Kobzol commented Sep 22, 2026

Uh oh!

rust-bors Bot commented Sep 22, 2026

Uh oh!

This comment has been minimized.

rust-bors Bot commented Sep 22, 2026

Uh oh!

Uh oh!

github-actions Bot commented Sep 22, 2026

Test differences

Stage 2

Job duration changes

Uh oh!

bjorn3 commented Sep 22, 2026

Uh oh!

GuillaumeGomez commented Sep 22, 2026

Uh oh!

rust-timer commented Sep 22, 2026

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!

20 participants

GuillaumeGomez commented Sep 8, 2026 •

edited by rustbot

Loading