Experiment linking with Wild by mati865 · Pull Request #151021 · rust-lang/rust

mati865 · 2026-01-12T20:02:54Z

Due to master branch migration, I cannot reopen #146421, so I'm moving to a new PR. Hopefully this sporadic perf testing is not viewed as disrupting or harmful to the project, otherwise let me know.

mati865 · 2026-01-12T20:03:48Z

@bors try @rust-timer queue

Experiment linking with Wild

Urgau · 2026-01-12T20:54:32Z

Don't worry about using our CI capacity. We explicitly allow "wasting our ressources":

Rust has plenty of CI capacity, and you should never have to worry about wasting computational resources each time you push a change. It is also perfectly fine (and even encouraged!) to use the CI to test your changes if it can help your productivity. In particular, we don’t recommend running the full ./x test suite locally, since it takes a very long time to execute.

rust-bors · 2026-01-12T22:59:07Z

💔 Test for fbf0e6a failed: CI. Failed jobs:

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

mati865 · 2026-01-12T23:12:57Z

@bors try

Experiment linking with Wild

rust-bors · 2026-01-13T01:28:01Z

☀️ Try build successful (CI)
Build commit: 289623b (289623b501cf708780d96485b05c4ccac7857d00, parent: aefa10405d7b67b3780027484cb02c85d3a3bf36)

rust-timer · 2026-01-13T02:10:26Z

Finished benchmarking commit (289623b): comparison URL.

Overall result: ✅ improvements - no action needed

Benchmarking this pull request means it may be perf-sensitive – we'll automatically label it not fit for rolling up. You can override this, but we strongly advise not to, due to possible changes in compiler perf.

@bors rollup=never
@rustbot label: -S-waiting-on-perf -perf-regression

Instruction count

Our most reliable metric. Used to determine the overall result above. However, even this metric can be noisy.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	0.0%	[0.0%, 0.0%]	1
Improvements ✅ (primary)	-3.9%	[-13.7%, -0.3%]	25
Improvements ✅ (secondary)	-2.6%	[-12.9%, -0.0%]	71
All ❌✅ (primary)	-3.9%	[-13.7%, -0.3%]	25

Max RSS (memory usage)

Results (primary -5.0%, secondary -0.9%)

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

	mean	range	count
Regressions ❌ (primary)	4.1%	[4.1%, 4.1%]	1
Regressions ❌ (secondary)	1.8%	[0.7%, 3.3%]	8
Improvements ✅ (primary)	-9.6%	[-14.0%, -5.3%]	2
Improvements ✅ (secondary)	-3.7%	[-4.9%, -1.8%]	8
All ❌✅ (primary)	-5.0%	[-14.0%, 4.1%]	3

Cycles

Results (primary -6.2%, secondary -5.7%)

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)	4.5%	[4.5%, 4.5%]	1
Improvements ✅ (primary)	-6.2%	[-11.9%, -2.6%]	14
Improvements ✅ (secondary)	-6.0%	[-12.2%, -2.1%]	41
All ❌✅ (primary)	-6.2%	[-11.9%, -2.6%]	14

Binary size

Results (primary -1.0%, secondary -1.6%)

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

	mean	range	count
Regressions ❌ (primary)	0.9%	[0.9%, 1.0%]	4
Regressions ❌ (secondary)	3.0%	[0.0%, 3.9%]	5
Improvements ✅ (primary)	-1.3%	[-2.4%, -0.4%]	28
Improvements ✅ (secondary)	-2.1%	[-4.1%, -0.0%]	48
All ❌✅ (primary)	-1.0%	[-2.4%, 1.0%]	32

Bootstrap: 474.371s -> 521.958s (10.03%)
Artifact size: 391.41 MiB -> 393.44 MiB (0.52%)

Experiment linking with Wild

rust-bors · 2026-05-26T14:42:27Z

💔 Test for a2e99a2 failed: CI. Failed job:

try - dist-x86_64-linux-quick (web logs, enhanced plaintext logs)

mati865 · 2026-05-26T15:06:57Z

@bors try

Experiment linking with Wild

rust-bors · 2026-05-26T15:36:38Z

💔 Test for eb93609 failed: CI. Failed job:

try - dist-x86_64-linux-quick (web logs, enhanced plaintext logs)

This reverts commit 7fa990f.

rust-log-analyzer · 2026-05-26T17:04:52Z

The job aarch64-gnu-llvm-21-2 failed! Check out the build log: (web) (plain enhanced) (plain)

Click to see the possible cause of the failure (guessed by this bot)

━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ Snapshot Summary ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
Snapshot: install_plain
Source: src/bootstrap/src/core/builder/tests.rs:2884
────────────────────────────────────────────────────────────────────────────────
Expression: ctx.config("install").args(&["--set",
&format!("install.prefix={}", ctx.normalized_dir()), "--set",
&format!("install.bindir={}", ctx.normalized_dir()), "--set",
&format!("install.libdir={}", ctx.normalized_dir()), "--set",
&format!("install.datadir={}", ctx.normalized_dir()), "--set",
&format!("install.mandir={}", ctx.normalized_dir()), "--set",
&format!("install.sysconfdir={}", ctx.normalized_dir()), "--build",
"x86_64-unknown-linux-gnu", "--host", "x86_64-unknown-linux-gnu", "--target",
"x86_64-unknown-linux-gnu",]).get_steps().render_with(RenderConfig
{ normalize_host: false })
────────────────────────────────────────────────────────────────────────────────
-old snapshot
+new results
────────────┬───────────────────────────────────────────────────────────────────
    1     1 │ [build] llvm <x86_64-unknown-linux-gnu>
    2     2 │ [build] rustc 0 <x86_64-unknown-linux-gnu> -> rustc 1 <x86_64-unknown-linux-gnu>
          3 │+[build] rustc 0 <x86_64-unknown-linux-gnu> -> WildLinker 1 <x86_64-unknown-linux-gnu>
    3     4 │ [build] rustc 0 <x86_64-unknown-linux-gnu> -> UnstableBookGen 1 <x86_64-unknown-linux-gnu>
    4     5 │ [build] rustc 0 <x86_64-unknown-linux-gnu> -> Rustbook 1 <x86_64-unknown-linux-gnu>
    5     6 │ [doc] unstable-book (book) <x86_64-unknown-linux-gnu>
    6     7 │ [build] rustc 1 <x86_64-unknown-linux-gnu> -> std 1 <x86_64-unknown-linux-gnu>
┈┈┈┈┈┈┈┈┈┈┈┈┼┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈
   11    12 │ [build] rustdoc 1 <x86_64-unknown-linux-gnu>
   12    13 │ [doc] rustc 1 <x86_64-unknown-linux-gnu> -> standalone 2 <x86_64-unknown-linux-gnu>
   13    14 │ [doc] rustc 1 <x86_64-unknown-linux-gnu> -> std 1 <x86_64-unknown-linux-gnu> crates=[alloc,compiler_builtins,core,panic_abort,panic_unwind,proc_macro,rustc-std-workspace-core,std,std_detect,sysroot,test,unwind]
   14    15 │ [build] rustc 1 <x86_64-unknown-linux-gnu> -> rustc 2 <x86_64-unknown-linux-gnu>
         16 │+[build] rustc 1 <x86_64-unknown-linux-gnu> -> WildLinker 2 <x86_64-unknown-linux-gnu>
   15    17 │ [build] rustc 1 <x86_64-unknown-linux-gnu> -> error-index 2 <x86_64-unknown-linux-gnu>
   16    18 │ [doc] rustc 1 <x86_64-unknown-linux-gnu> -> error-index 2 <x86_64-unknown-linux-gnu>
   17    19 │ [doc] nomicon (book) <x86_64-unknown-linux-gnu>
   18    20 │ [doc] rustc 1 <x86_64-unknown-linux-gnu> -> reference (book) 2 <x86_64-unknown-linux-gnu>
────────────┴───────────────────────────────────────────────────────────────────
Stopped on the first failure. Run `cargo insta test` to run all snapshots.

thread 'core::builder::tests::snapshot::install_plain' (10933) panicked at /cargo/registry/src/index.crates.io-1949cf8c6b5b557f/insta-1.47.2/src/runtime.rs:719:13:
snapshot assertion for 'install_plain' failed in line 2884
stack backtrace:
   0: __rustc::rust_begin_unwind
             at /rustc/ef0fb8a2563200e322fa4419f09f65a63742038c/library/std/src/panicking.rs:689:5
   1: core::panicking::panic_fmt
             at /rustc/ef0fb8a2563200e322fa4419f09f65a63742038c/library/core/src/panicking.rs:80:14
   2: <insta::runtime::SnapshotAssertionContext>::finalize
             at /cargo/registry/src/index.crates.io-1949cf8c6b5b557f/insta-1.47.2/src/runtime.rs:719:13
   3: insta::runtime::assert_snapshot
             at /cargo/registry/src/index.crates.io-1949cf8c6b5b557f/insta-1.47.2/src/runtime.rs:937:13
   4: bootstrap::core::builder::tests::snapshot::install_plain
             at ./src/core/builder/tests.rs:2884:9
   5: bootstrap::core::builder::tests::snapshot::install_plain::{closure#0}
             at ./src/core/builder/tests.rs:2882:23
   6: <bootstrap::core::builder::tests::snapshot::install_plain::{closure#0} as core::ops::function::FnOnce<()>>::call_once
---
##[group]Installing src for x86_64-unknown-linux-gnu
##[endgroup]
##[group]Building stage2 codegen backend cranelift (stage1 -> stage2, x86_64-unknown-linux-gnu)
##[endgroup]
skipping Install CodegenBackend("cranelift") stage2 (x86_64-unknown-linux-gnu)
##[group]Building stage2 llvm-bitcode-linker (stage1 -> stage2, x86_64-unknown-linux-gnu)
##[endgroup]
Dist llvm-bitcode-linker-1.98.0-dev-x86_64-unknown-linux-gnu
##[group]Installing stage2 llvm-bitcode-linker (stage1 -> stage2, x86_64-unknown-linux-gnu)
##[endgroup]
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ Snapshot Summary ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
Snapshot: install_extended
Source: src/bootstrap/src/core/builder/tests.rs:3029
────────────────────────────────────────────────────────────────────────────────
Expression: ctx.config("install").args(&["--set",
&format!("install.prefix={}", ctx.normalized_dir()), "--set",
&format!("install.bindir={}", ctx.normalized_dir()), "--set",
&format!("install.libdir={}", ctx.normalized_dir()), "--set",
&format!("install.datadir={}", ctx.normalized_dir()), "--set",
&format!("install.mandir={}", ctx.normalized_dir()), "--set",
&format!("install.sysconfdir={}", ctx.normalized_dir()), "--set",
"build.extended=true", "--build", "x86_64-unknown-linux-gnu", "--host",
"x86_64-unknown-linux-gnu",]).get_steps().render_with(RenderConfig
{ normalize_host: false })
────────────────────────────────────────────────────────────────────────────────
-old snapshot
+new results
────────────┬───────────────────────────────────────────────────────────────────
    1     1 │ [build] llvm <x86_64-unknown-linux-gnu>
    2     2 │ [build] rustc 0 <x86_64-unknown-linux-gnu> -> rustc 1 <x86_64-unknown-linux-gnu>
          3 │+[build] rustc 0 <x86_64-unknown-linux-gnu> -> WildLinker 1 <x86_64-unknown-linux-gnu>
    3     4 │ [build] rustc 0 <x86_64-unknown-linux-gnu> -> WasmComponentLd 1 <x86_64-unknown-linux-gnu>
    4     5 │ [build] rustc 0 <x86_64-unknown-linux-gnu> -> UnstableBookGen 1 <x86_64-unknown-linux-gnu>
    5     6 │ [build] rustc 0 <x86_64-unknown-linux-gnu> -> Rustbook 1 <x86_64-unknown-linux-gnu>
    6     7 │ [doc] unstable-book (book) <x86_64-unknown-linux-gnu>
┈┈┈┈┈┈┈┈┈┈┈┈┼┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈
   12    13 │ [build] rustdoc 1 <x86_64-unknown-linux-gnu>
   13    14 │ [doc] rustc 1 <x86_64-unknown-linux-gnu> -> standalone 2 <x86_64-unknown-linux-gnu>
   14    15 │ [doc] rustc 1 <x86_64-unknown-linux-gnu> -> std 1 <x86_64-unknown-linux-gnu> crates=[alloc,compiler_builtins,core,panic_abort,panic_unwind,proc_macro,rustc-std-workspace-core,std,std_detect,sysroot,test,unwind]
   15    16 │ [build] rustc 1 <x86_64-unknown-linux-gnu> -> rustc 2 <x86_64-unknown-linux-gnu>
         17 │+[build] rustc 1 <x86_64-unknown-linux-gnu> -> WildLinker 2 <x86_64-unknown-linux-gnu>
   16    18 │ [build] rustc 1 <x86_64-unknown-linux-gnu> -> WasmComponentLd 2 <x86_64-unknown-linux-gnu>
   17    19 │ [build] rustc 1 <x86_64-unknown-linux-gnu> -> error-index 2 <x86_64-unknown-linux-gnu>
   18    20 │ [doc] rustc 1 <x86_64-unknown-linux-gnu> -> error-index 2 <x86_64-unknown-linux-gnu>
   19    21 │ [doc] nomicon (book) <x86_64-unknown-linux-gnu>
────────────┴───────────────────────────────────────────────────────────────────
Stopped on the first failure. Run `cargo insta test` to run all snapshots.

thread 'core::builder::tests::snapshot::install_extended' (10916) panicked at /cargo/registry/src/index.crates.io-1949cf8c6b5b557f/insta-1.47.2/src/runtime.rs:719:13:
snapshot assertion for 'install_extended' failed in line 3029
stack backtrace:
   0: __rustc::rust_begin_unwind
             at /rustc/ef0fb8a2563200e322fa4419f09f65a63742038c/library/std/src/panicking.rs:689:5
   1: core::panicking::panic_fmt
             at /rustc/ef0fb8a2563200e322fa4419f09f65a63742038c/library/core/src/panicking.rs:80:14
   2: <insta::runtime::SnapshotAssertionContext>::finalize
             at /cargo/registry/src/index.crates.io-1949cf8c6b5b557f/insta-1.47.2/src/runtime.rs:719:13
   3: insta::runtime::assert_snapshot
             at /cargo/registry/src/index.crates.io-1949cf8c6b5b557f/insta-1.47.2/src/runtime.rs:937:13
   4: bootstrap::core::builder::tests::snapshot::install_extended
             at ./src/core/builder/tests.rs:3029:9
   5: bootstrap::core::builder::tests::snapshot::install_extended::{closure#0}
             at ./src/core/builder/tests.rs:3027:26
   6: <bootstrap::core::builder::tests::snapshot::install_extended::{closure#0} as core::ops::function::FnOnce<()>>::call_once
---
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ Snapshot Summary ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
Snapshot: install_src
Source: src/bootstrap/src/core/builder/tests.rs:2942
────────────────────────────────────────────────────────────────────────────────
Expression: ctx.config("install").path("src").args(&["--set",
&format!("install.prefix={}", ctx.normalized_dir()), "--set",
&format!("install.bindir={}", ctx.normalized_dir()), "--set",
&format!("install.libdir={}", ctx.normalized_dir()), "--set",
&format!("install.datadir={}", ctx.normalized_dir()), "--set",
&format!("install.mandir={}", ctx.normalized_dir()), "--set",
&format!("install.sysconfdir={}", ctx.normalized_dir()), "--build",
"x86_64-unknown-linux-gnu", "--host", "x86_64-unknown-linux-gnu", "--target",
"x86_64-unknown-linux-gnu",]).get_steps().render_with(RenderConfig
{ normalize_host: false })
────────────────────────────────────────────────────────────────────────────────
-old snapshot
+new results
────────────┬───────────────────────────────────────────────────────────────────
    1     1 │ [build] llvm <x86_64-unknown-linux-gnu>
    2     2 │ [build] rustc 0 <x86_64-unknown-linux-gnu> -> rustc 1 <x86_64-unknown-linux-gnu>
          3 │+[build] rustc 0 <x86_64-unknown-linux-gnu> -> WildLinker 1 <x86_64-unknown-linux-gnu>
    3     4 │ [build] rustc 0 <x86_64-unknown-linux-gnu> -> UnstableBookGen 1 <x86_64-unknown-linux-gnu>
    4     5 │ [build] rustc 0 <x86_64-unknown-linux-gnu> -> Rustbook 1 <x86_64-unknown-linux-gnu>
    5     6 │ [doc] unstable-book (book) <x86_64-unknown-linux-gnu>
    6     7 │ [build] rustc 1 <x86_64-unknown-linux-gnu> -> std 1 <x86_64-unknown-linux-gnu>
┈┈┈┈┈┈┈┈┈┈┈┈┼┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈
   11    12 │ [build] rustdoc 1 <x86_64-unknown-linux-gnu>
   12    13 │ [doc] rustc 1 <x86_64-unknown-linux-gnu> -> standalone 2 <x86_64-unknown-linux-gnu>
   13    14 │ [doc] rustc 1 <x86_64-unknown-linux-gnu> -> std 1 <x86_64-unknown-linux-gnu> crates=[alloc,compiler_builtins,core,panic_abort,panic_unwind,proc_macro,rustc-std-workspace-core,std,std_detect,sysroot,test,unwind]
   14    15 │ [build] rustc 1 <x86_64-unknown-linux-gnu> -> rustc 2 <x86_64-unknown-linux-gnu>
         16 │+[build] rustc 1 <x86_64-unknown-linux-gnu> -> WildLinker 2 <x86_64-unknown-linux-gnu>
   15    17 │ [build] rustc 1 <x86_64-unknown-linux-gnu> -> error-index 2 <x86_64-unknown-linux-gnu>
   16    18 │ [doc] rustc 1 <x86_64-unknown-linux-gnu> -> error-index 2 <x86_64-unknown-linux-gnu>
   17    19 │ [doc] nomicon (book) <x86_64-unknown-linux-gnu>
   18    20 │ [doc] rustc 1 <x86_64-unknown-linux-gnu> -> reference (book) 2 <x86_64-unknown-linux-gnu>
────────────┴───────────────────────────────────────────────────────────────────
Stopped on the first failure. Run `cargo insta test` to run all snapshots.

thread 'core::builder::tests::snapshot::install_src' (11042) panicked at /cargo/registry/src/index.crates.io-1949cf8c6b5b557f/insta-1.47.2/src/runtime.rs:719:13:
snapshot assertion for 'install_src' failed in line 2942
stack backtrace:
   0: __rustc::rust_begin_unwind
             at /rustc/ef0fb8a2563200e322fa4419f09f65a63742038c/library/std/src/panicking.rs:689:5
   1: core::panicking::panic_fmt
             at /rustc/ef0fb8a2563200e322fa4419f09f65a63742038c/library/core/src/panicking.rs:80:14
   2: <insta::runtime::SnapshotAssertionContext>::finalize
             at /cargo/registry/src/index.crates.io-1949cf8c6b5b557f/insta-1.47.2/src/runtime.rs:719:13
   3: insta::runtime::assert_snapshot
             at /cargo/registry/src/index.crates.io-1949cf8c6b5b557f/insta-1.47.2/src/runtime.rs:937:13
   4: bootstrap::core::builder::tests::snapshot::install_src
             at ./src/core/builder/tests.rs:2942:9
   5: bootstrap::core::builder::tests::snapshot::install_src::{closure#0}
             at ./src/core/builder/tests.rs:2940:21
   6: <bootstrap::core::builder::tests::snapshot::install_src::{closure#0} as core::ops::function::FnOnce<()>>::call_once
---
##[endgroup]
Dist rust-docs-1.98.0-dev-x86_64-unknown-linux-gnu
##[group]Installing stage2 docs (stage1 -> stage2, x86_64-unknown-linux-gnu)
##[endgroup]
##[group]Vendoring sources to "/tmp/.tmpVhSMzm/build/tmp-dry-run/tmp/tarball/rust-src/image/lib/rustlib/src/rust"
##[endgroup]
Dist rust-src-1.98.0-dev
##[group]Installing src for x86_64-unknown-linux-gnu
##[endgroup]
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ Snapshot Summary ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
Snapshot: install_src_no_docs
Source: src/bootstrap/src/core/builder/tests.rs:2998
────────────────────────────────────────────────────────────────────────────────
Expression: ctx.config("install").path("src").args(&["--set",
&format!("install.prefix={}", ctx.normalized_dir()), "--set",
&format!("install.bindir={}", ctx.normalized_dir()), "--set",
&format!("install.libdir={}", ctx.normalized_dir()), "--set",
&format!("install.datadir={}", ctx.normalized_dir()), "--set",
&format!("install.mandir={}", ctx.normalized_dir()), "--set",
&format!("install.sysconfdir={}", ctx.normalized_dir()), "--set",
"build.docs=false", "--build", "x86_64-unknown-linux-gnu", "--host",
"x86_64-unknown-linux-gnu", "--target",
"x86_64-unknown-linux-gnu",]).get_steps().render_with(RenderConfig
{ normalize_host: false })
────────────────────────────────────────────────────────────────────────────────
-old snapshot
+new results
────────────┬───────────────────────────────────────────────────────────────────
    1     1 │ [build] llvm <x86_64-unknown-linux-gnu>
    2     2 │ [build] rustc 0 <x86_64-unknown-linux-gnu> -> rustc 1 <x86_64-unknown-linux-gnu>
          3 │+[build] rustc 0 <x86_64-unknown-linux-gnu> -> WildLinker 1 <x86_64-unknown-linux-gnu>
    3     4 │ [build] rustc 0 <x86_64-unknown-linux-gnu> -> RustInstaller 1 <x86_64-unknown-linux-gnu>
    4     5 │ [dist] docs <x86_64-unknown-linux-gnu>
    5     6 │ [dist] src <>
────────────┴───────────────────────────────────────────────────────────────────
Stopped on the first failure. Run `cargo insta test` to run all snapshots.

thread 'core::builder::tests::snapshot::install_src_no_docs' (11093) panicked at /cargo/registry/src/index.crates.io-1949cf8c6b5b557f/insta-1.47.2/src/runtime.rs:719:13:
snapshot assertion for 'install_src_no_docs' failed in line 2998
stack backtrace:
   0: __rustc::rust_begin_unwind
             at /rustc/ef0fb8a2563200e322fa4419f09f65a63742038c/library/std/src/panicking.rs:689:5
   1: core::panicking::panic_fmt
             at /rustc/ef0fb8a2563200e322fa4419f09f65a63742038c/library/core/src/panicking.rs:80:14
   2: <insta::runtime::SnapshotAssertionContext>::finalize
             at /cargo/registry/src/index.crates.io-1949cf8c6b5b557f/insta-1.47.2/src/runtime.rs:719:13
   3: insta::runtime::assert_snapshot
             at /cargo/registry/src/index.crates.io-1949cf8c6b5b557f/insta-1.47.2/src/runtime.rs:937:13
   4: bootstrap::core::builder::tests::snapshot::install_src_no_docs
             at ./src/core/builder/tests.rs:2998:9
   5: bootstrap::core::builder::tests::snapshot::install_src_no_docs::{closure#0}
             at ./src/core/builder/tests.rs:2996:29
   6: <bootstrap::core::builder::tests::snapshot::install_src_no_docs::{closure#0} as core::ops::function::FnOnce<()>>::call_once

mati865 · 2026-05-26T17:11:56Z

Perhaps LLD can handle LLVM-IR without explicit plugin?

error: linking with `cc` failed: exit status: 1
  |
  = note:  "cc" "-Wl,--version-script=/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-rustc/x86_64-unknown-linux-gnu/release/deps/rustcfQ9938/list" "-Wl,--no-undefined-version" "<256 object files omitted>" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-rustc/x86_64-unknown-linux-gnu/release/deps/rustcfQ9938/rmeta.o" "-Wl,--as-needed" "-Wl,-Bstatic" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-rustc/x86_64-unknown-linux-gnu/release/deps/rustcfQ9938/{librustc_codegen_llvm-b53a9454f1a44ace,librustc_llvm-63c4fcece66304bd,libblake3-da0bf9ffdc804c13,libpsm-c33f6768f7caa2ea,libprofiler_builtins-0903ca5b7d92b67d}.rlib" "<sysroot>/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcompiler_builtins-*.rlib" "-Wl,-Bdynamic" "-ldl" "-lLLVM-22-rust-1.98.0-nightly" "-ldl" "-lgcc_s" "-lutil" "-lrt" "-lpthread" "-lm" "-ldl" "-lc" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-rustc/x86_64-unknown-linux-gnu/release/deps/rustcfQ9938/raw-dylibs" "-B<sysroot>/lib/rustlib/x86_64-unknown-linux-gnu/bin/wild-gcc-ld" "-B<sysroot>/lib/rustlib/x86_64-unknown-linux-gnu/bin/wild-gcc-ld" "-Wl,--eh-frame-hdr" "-Wl,-z,noexecstack" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-rustc/x86_64-unknown-linux-gnu/release/build/psm-5b3c8cd0de07bd1e/out" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-rustc/x86_64-unknown-linux-gnu/release/build/blake3-954754163e17057e/out" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-rustc/x86_64-unknown-linux-gnu/release/build/rustc_llvm-4ef6a55664ab6d46/out" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/llvm/lib" "-L" "/rustroot/bin/../lib/gcc/x86_64-pc-linux-gnu/9.5.0/../../../../lib64" "-L" "<sysroot>/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-o" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_driver-5e884912265112cb.so" "-shared" "-Wl,-soname=librustc_driver-5e884912265112cb.so" "-Wl,-z,relro,-z,now" "-Wl,-O1" "-nodefaultlibs" "-u" "__llvm_profile_runtime" "-Wl,-z,origin" "-Wl,-rpath,$ORIGIN/../lib" "-Wl,--icf=all"
  = note: some arguments are omitted. use `--verbose` to show all linker arguments
  = note: wild: warning: --icf=all is not yet supported
          wild: error: Input file /checkout/obj/build/x86_64-unknown-linux-gnu/stage2-rustc/x86_64-unknown-linux-gnu/release/deps/rustcfQ9938/librustc_codegen_llvm-b53a9454f1a44ace.rlib @ ef10e86dc40538c1-PassWrapper.o contains LLVM-IR, but the linker plugin ((/rustroot/libexec/gcc/x86_64-pc-linux-gnu/9.5.0/liblto_plugin.so)) didn't claim it
          collect2: error: ld returned 255 exit status

@bors try

Experiment linking with Wild

rust-bors · 2026-05-26T20:16:44Z

☀️ Try build successful (CI)
Build commit: bf6ae7d (bf6ae7d44cc84cd8f73d477b3f387ee56f8ccf16, parent: b4fefcd60bfd770510f7dc540e887dd3ba4fe5c1)

mati865 · 2026-05-26T20:49:39Z

@rust-timer queue

mati865 · 2026-05-26T20:50:26Z

@rust-timer build bf6ae7d

bjorn3 · 2026-05-26T21:07:08Z

Perhaps LLD can handle LLVM-IR without explicit plugin?

Indeed. I don't think LLD even supports linker plugins at all. It just has hard coded support for LLVM LTO.

rust-timer · 2026-05-26T21:32:48Z

Finished benchmarking commit (bf6ae7d): comparison URL.

Overall result: ❌✅ regressions and improvements - please read:

Benchmarking means the PR may be perf-sensitive. It's automatically marked not fit for rolling up. Overriding is possible but disadvised: it risks changing compiler perf.

Next, please: If you can, justify the regressions found in this try perf run in writing along with @rustbot label: +perf-regression-triaged. If not, fix the regressions and do another perf run. Neutral or positive results will clear the label automatically.

@bors rollup=never
@rustbot label: -S-waiting-on-perf +perf-regression

Instruction count

Our most reliable metric. Used to determine the overall result above. However, even this metric can be noisy.

	mean	range	count
Regressions ❌ (primary)	0.8%	[0.3%, 1.6%]	9
Regressions ❌ (secondary)	0.5%	[0.3%, 0.9%]	6
Improvements ✅ (primary)	-4.0%	[-6.9%, -0.7%]	6
Improvements ✅ (secondary)	-1.9%	[-6.1%, -0.1%]	31
All ❌✅ (primary)	-1.1%	[-6.9%, 1.6%]	15

Max RSS (memory usage)

Results (primary -4.7%, secondary 2.4%)

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

	mean	range	count
Regressions ❌ (primary)	2.0%	[1.7%, 2.3%]	3
Regressions ❌ (secondary)	3.5%	[2.2%, 6.6%]	7
Improvements ✅ (primary)	-8.7%	[-21.0%, -3.2%]	5
Improvements ✅ (secondary)	-4.9%	[-4.9%, -4.9%]	1
All ❌✅ (primary)	-4.7%	[-21.0%, 2.3%]	8

Cycles

Results (primary -5.0%, secondary -5.8%)

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)	-	-	0
Improvements ✅ (primary)	-5.0%	[-9.5%, -2.4%]	10
Improvements ✅ (secondary)	-5.8%	[-9.0%, -2.5%]	17
All ❌✅ (primary)	-5.0%	[-9.5%, -2.4%]	10

Binary size

Results (primary -1.1%, secondary -1.6%)

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

	mean	range	count
Regressions ❌ (primary)	0.9%	[0.9%, 1.0%]	4
Regressions ❌ (secondary)	3.2%	[0.1%, 4.1%]	5
Improvements ✅ (primary)	-1.4%	[-2.4%, -0.4%]	23
Improvements ✅ (secondary)	-2.1%	[-4.1%, -0.0%]	45
All ❌✅ (primary)	-1.1%	[-2.4%, 1.0%]	27

Bootstrap: 518.746s -> 578.311s (11.48%)
Artifact size: 400.67 MiB -> 400.62 MiB (-0.01%)

mati865 · 2026-05-26T21:37:53Z

Indeed. I don't think LLD even supports linker plugins at all. It just has hard coded support for LLVM LTO.

Bummer, but thanks for the confirmation.

rust-bors · 2026-05-30T07:21:34Z

☔ The latest upstream changes (presumably #157121) made this pull request unmergeable. Please resolve the merge conflicts.

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rust-bors Bot pushed a commit that referenced this pull request Jan 12, 2026

Auto merge of #151021 - mati865:wild-experiments, r=<try>

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Experiment linking with Wild

rustbot added the S-waiting-on-perf Status: Waiting on a perf run to be completed. label Jan 12, 2026

mati865 mentioned this pull request Jan 12, 2026

Wild experiments #146421

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Auto merge of #151021 - mati865:wild-experiments, r=<try>

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rustbot removed the S-waiting-on-perf Status: Waiting on a perf run to be completed. label Jan 13, 2026

mati865 added 6 commits May 26, 2026 13:51

Link with Wild 0.7

93b8469

upcoming 0.8

176cc08

fix

30e33c4

Silence tidy

384f39b

Update Wild to 0.9

f9f9320

Use Wild to link rustc (with LTO)

7fa990f

rust-bors Bot pushed a commit that referenced this pull request May 26, 2026

Auto merge of #151021 - mati865:wild-experiments, r=<try>

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Oops, enable features

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rust-bors Bot pushed a commit that referenced this pull request May 26, 2026

Auto merge of #151021 - mati865:wild-experiments, r=<try>

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Revert "Use Wild to link rustc (with LTO)"

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This reverts commit 7fa990f.

rust-bors Bot pushed a commit that referenced this pull request May 26, 2026

Auto merge of #151021 - mati865:wild-experiments, r=<try>

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rustbot added perf-regression Performance regression. and removed S-waiting-on-perf Status: Waiting on a perf run to be completed. labels May 26, 2026

mati865 closed this May 30, 2026

rustbot removed the S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. label May 30, 2026

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Overall result: ✅ improvements - no action needed

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Overall result: ❌✅ regressions and improvements - please read:

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