[win] Use a dash instead of slash for linker to avoid breaking lld #140977

dpaoliello · 2025-05-13T21:06:39Z

#140758 added the /arm64hazardfree linker arg for aarch64-pc-windows-msvc, unfortunately this breaks linking with lld as it 1) doesn't understand the arguments and 2) assumes that unknown args that start with / are input files.

Fix is to use a dash for the arg: -arm64hazardfree

r? @wesleywiser

rustbot · 2025-05-13T21:06:44Z

These commits modify compiler targets.
(See the Target Tier Policy.)

dpaoliello · 2025-05-13T21:08:12Z

r? @jieyouxu

(Sorry, referenced the wrong PR as causing the regression)

jieyouxu

Thanks

jieyouxu · 2025-05-14T00:18:07Z

r? jieyouxu @bors r+ rollup

bors · 2025-05-14T00:18:10Z

📌 Commit a1ea0ce has been approved by jieyouxu

It is now in the queue for this repository.

bors · 2025-05-14T05:39:10Z

⌛ Testing commit a1ea0ce with merge 55429e2...

[win] Use a dash instead of slash for linker to avoid breaking lld rust-lang#140758 added the `/arm64hazardfree` linker arg for aarch64-pc-windows-msvc, unfortunately this breaks linking with `lld` as it 1) doesn't understand the arguments and 2) assumes that unknown args that start with `/` are input files. Fix is to use a dash for the arg: `-arm64hazardfree` r? `@wesleywiser`

rust-log-analyzer · 2025-05-14T07:38:45Z

The job x86_64-msvc-1 failed! Check out the build log: (web) (plain)

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

test [rustdoc] tests\rustdoc\private\files-creation-private.rs ... FAILED
test [rustdoc] tests\rustdoc\private\hidden-private.rs ... FAILED
test [rustdoc] tests\rustdoc\private\inline-private-with-intermediate-doc-hidden.rs ... FAILED
test [rustdoc] tests\rustdoc\private\inner-private-110422.rs ... FAILED
test [rustdoc] tests\rustdoc\private\macro-document-private-duplicate.rs ... ignored, ignored always ((fa2025-05-14T07:38:33.7790497Z ##[error]There is not enough space on the disk. : 'C:\actions-runner\cached\_diag\blocks\5e069e9a-a3b8-445c-8b4c-268021635ec2_27eb41a7-2ed4-56f7-ee04-8c5e17bd5c5c.2'
##[error]There is not enough space on the disk. : 'C:\actions-runner\cached\_diag\pages\5e069e9a-a3b8-445c-8b4c-268021635ec2_ccc4059e-4ea2-4996-9631-737428769f20_1.log'

bors · 2025-05-14T07:39:23Z

💔 Test failed - checks-actions

jieyouxu · 2025-05-14T08:17:20Z

@bors retry (not enough space)

[win] Use a dash instead of slash for linker to avoid breaking lld rust-lang#140758 added the `/arm64hazardfree` linker arg for aarch64-pc-windows-msvc, unfortunately this breaks linking with `lld` as it 1) doesn't understand the arguments and 2) assumes that unknown args that start with `/` are input files. Fix is to use a dash for the arg: `-arm64hazardfree` r? `@wesleywiser`

Rollup of 4 pull requests Successful merges: - rust-lang#140953 (Fix a compiletest blessing message) - rust-lang#140973 (Update rustix to 1.0.7 for bootstrap) - rust-lang#140976 (Add `Ipv4Addr` and `Ipv6Addr` diagnostic items) - rust-lang#140977 ([win] Use a dash instead of slash for linker to avoid breaking lld) r? `@ghost` `@rustbot` modify labels: rollup

glandium · 2025-05-15T00:20:48Z

Fix is to use a dash for the arg: -arm64hazardfree

For a value of "fix" that means lld emitting a warning about an unknown argument.

[win] Use a dash instead of slash for linker to avoid breaking lld rust-lang#140758 added the `/arm64hazardfree` linker arg for aarch64-pc-windows-msvc, unfortunately this breaks linking with `lld` as it 1) doesn't understand the arguments and 2) assumes that unknown args that start with `/` are input files. Fix is to use a dash for the arg: `-arm64hazardfree` r? `@wesleywiser`

dpaoliello · 2025-05-15T17:55:41Z

Fix is to use a dash for the arg: -arm64hazardfree

For a value of "fix" that means lld emitting a warning about an unknown argument.

Unfortunately, #133409 forced the lld and non-lld args to be the same, and there doesn't seem to be a standard way to indicate that an argument is intentionally different between the two.

@RalfJung @petrochenkov what's the correct way to add an MSVC linker ONLY arg that SHOULDN'T be passed to lld?

dpaoliello · 2025-05-15T18:07:00Z

Nevermind, the more that I think about this, the more that I believe that using the undocumented flag is the incorrect solution.

I'm going to disable the test instead, and I've filed a bug against the MSVC team to remove this check from the linker: https://developercommunity.microsoft.com/t/Remove-checking-for-and-fixing-Cortex-A/10905134

dpaoliello · 2025-05-15T18:20:59Z

Abandoning in favor of #141045

…mpiler-errors Rollup of 14 pull requests Successful merges: - rust-lang#139749 (docs(library/core/src/pin): fix typo "necessarily" -> "necessary") - rust-lang#140130 (Add LLDB providers for BTreeMap and BTreeSet) - rust-lang#140685 (Simplify `Vec::as_non_null` implementation and make it `const`) - rust-lang#140712 (normalization: avoid incompletely constraining GAT args) - rust-lang#140768 (Improve `dangerous_implicit_aurorefs` diagnostic output) - rust-lang#140834 (move (or remove) some impl Trait tests) - rust-lang#140910 (Remove `stable` attribute from wasi fs (read_exact|write_all)_at) - rust-lang#140947 (Flush errors before deep normalize in `dropck_outlives`) - rust-lang#140966 (Remove #![feature(let_chains)] from library and src/librustdoc) - rust-lang#140977 ([win] Use a dash instead of slash for linker to avoid breaking lld) - rust-lang#140990 (VxWorks: updates from recent libc versions) - rust-lang#141003 (Improve ternary operator recovery) - rust-lang#141013 (Implement methods to set STARTUPINFO flags for Command API on Windows) - rust-lang#141026 (rustc-dev-guide subtree update) r? `@ghost` `@rustbot` modify labels: rollup

[win][arm64] Remove 'Arm64 Hazard' undocumented MSVC option and instead disable problematic test PR rust-lang#140758 added the undocumented `/arm64hazardfree` MSVC linker flag to work around a test failure where LLVM generated code that would trip a hazard in an outdated ARM processor. Adding this flag caused issues with LLD, as it doesn't recognize it. Rethinking the issue, using the undocumented flag seems like the incorrect solution: there's no guarantee that the flag won't be removed in the future, or change its meaning. Instead, I've disabled the problematic test for Arm64 Windows and have filed a bug with the MSVC team to have the check removed: <https://developercommunity.microsoft.com/t/Remove-checking-for-and-fixing-Cortex-A/10905134> This PR supersedes rust-lang#140977 r? `@jieyouxu`

[win][arm64] Remove 'Arm64 Hazard' undocumented MSVC option and instead disable problematic test PR rust-lang#140758 added the undocumented `/arm64hazardfree` MSVC linker flag to work around a test failure where LLVM generated code that would trip a hazard in an outdated ARM processor. Adding this flag caused issues with LLD, as it doesn't recognize it. Rethinking the issue, using the undocumented flag seems like the incorrect solution: there's no guarantee that the flag won't be removed in the future, or change its meaning. Instead, I've disabled the problematic test for Arm64 Windows and have filed a bug with the MSVC team to have the check removed: <https://developercommunity.microsoft.com/t/Remove-checking-for-and-fixing-Cortex-A/10905134> This PR supersedes rust-lang#140977 r? ``@jieyouxu``

[win][arm64] Remove 'Arm64 Hazard' undocumented MSVC option and instead disable problematic test PR rust-lang#140758 added the undocumented `/arm64hazardfree` MSVC linker flag to work around a test failure where LLVM generated code that would trip a hazard in an outdated ARM processor. Adding this flag caused issues with LLD, as it doesn't recognize it. Rethinking the issue, using the undocumented flag seems like the incorrect solution: there's no guarantee that the flag won't be removed in the future, or change its meaning. Instead, I've disabled the problematic test for Arm64 Windows and have filed a bug with the MSVC team to have the check removed: <https://developercommunity.microsoft.com/t/Remove-checking-for-and-fixing-Cortex-A/10905134> This PR supersedes rust-lang#140977 r? ```@jieyouxu```

Rollup merge of rust-lang#141045 - dpaoliello:noarmhazard, r=jieyouxu [win][arm64] Remove 'Arm64 Hazard' undocumented MSVC option and instead disable problematic test PR rust-lang#140758 added the undocumented `/arm64hazardfree` MSVC linker flag to work around a test failure where LLVM generated code that would trip a hazard in an outdated ARM processor. Adding this flag caused issues with LLD, as it doesn't recognize it. Rethinking the issue, using the undocumented flag seems like the incorrect solution: there's no guarantee that the flag won't be removed in the future, or change its meaning. Instead, I've disabled the problematic test for Arm64 Windows and have filed a bug with the MSVC team to have the check removed: <https://developercommunity.microsoft.com/t/Remove-checking-for-and-fixing-Cortex-A/10905134> This PR supersedes rust-lang#140977 r? ```@jieyouxu```

[win] Use a dash instead of slash for linker to avoid breaking lld

a1ea0ce

rustbot assigned wesleywiser May 13, 2025

rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels May 13, 2025

rustbot assigned jieyouxu and unassigned wesleywiser May 13, 2025

dpaoliello mentioned this pull request May 13, 2025

[win][arm64] Disable MSVC Linker 'Arm Hazard' warning #140758

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jieyouxu approved these changes May 14, 2025

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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 May 14, 2025

bors 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 May 14, 2025

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 May 14, 2025

jieyouxu mentioned this pull request May 14, 2025

Rollup of 4 pull requests #140993

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compiler-errors mentioned this pull request May 15, 2025

Rollup of 14 pull requests #141041

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dpaoliello mentioned this pull request May 15, 2025

[win][arm64] Remove 'Arm64 Hazard' undocumented MSVC option and instead disable problematic test #141045

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dpaoliello closed this May 15, 2025

dpaoliello deleted the dash branch August 5, 2025 00:09

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