Revive L4Re target by farao · Pull Request #150885 · rust-lang/rust

farao · 2026-01-09T17:13:31Z

This revives the target for the L4Re OS. It changes the way, linking is done and adds aarch64 support and documentation including a maintainer for the target.

The update of the libc crate is necessary since only in 0.2.179 and higher is the fixed support for L4Re on uclibc.

rustbot · 2026-01-09T17:13:35Z

Some changes occurred in src/doc/rustc/src/platform-support

cc @Noratrieb

These commits modify the library/Cargo.lock file. Unintentional changes to library/Cargo.lock can be introduced when switching branches and rebasing PRs.

If this was unintentional then you should revert the changes before this PR is merged.
Otherwise, you can ignore this comment.

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

rustbot · 2026-01-09T17:13:37Z

r? @joboet

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rustbot · 2026-01-10T17:21:31Z

Some changes occurred in compiler/rustc_codegen_cranelift

cc @bjorn3

rust-analyzer is developed in its own repository. If possible, consider making this change to rust-lang/rust-analyzer instead.

cc @rust-lang/rust-analyzer

Some changes occurred in src/tools/clippy

cc @rust-lang/clippy

Some changes occurred in compiler/rustc_codegen_gcc

cc @antoyo, @GuillaumeGomez

Some changes occurred in GUI tests.

cc @GuillaumeGomez

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cc @jdonszelmann

Some changes occurred in HTML/CSS/JS.

cc @GuillaumeGomez, @lolbinarycat

GuillaumeGomez · 2026-01-10T17:22:55Z

Wrong rebase.

farao · 2026-01-10T17:29:24Z

Sorry for rebasing on an old commit by mistake

rust-bors · 2026-01-14T16:53:30Z

☔ The latest upstream changes (presumably #151107) made this pull request unmergeable. Please resolve the merge conflicts.

joboet

I can only comment on the library changes, those seem mostly fine to me.

View changes since this review

joboet · 2026-01-22T13:35:48Z

Does L4Re truly not support networking? All the necessary functions seem to be available in libc. What happens if you remove the L4Re special case from sys/net/connection/mod.rs?

Regarding the libc functions: L4Re's uclibc adaptation has a variety of these function which will when called just return an error or a disabled status code. I decided to put these in the libc crate because that should imo just bluntly mirror the functions when they exist, no matter if they are somehow disabled.

joboet · 2026-01-22T13:44:29Z

    #[allow(deprecated)]
    fn as_raw_stat(&self) -> &raw::stat {
-        unsafe { &*(self.as_inner().as_inner() as *const libc::stat64 as *const raw::stat) }
+        panic!("as_raw_stat not supported for L4Re");


How that? stat does appear in libc.

You're right, I'll change it back.

farao · 2026-01-29T09:51:59Z

Thanks for having a look! I realised that I need to disable some std tests for the std test suite to run through, I will make a small update to this PR this or next week.

Regarding networking (and to a somewhat lesser extent for fs): We do have initial support but that's opt-in and likely about to change, therefore we decided that this should be/stay disabled for now.

joboet · 2026-02-07T15:22:55Z

I'm just a bit worried about this removing the stable AsFd/... implementations for the sockets...

joboet · 2026-02-07T15:34:41Z

@rustbot author

saethlin · 2026-07-29T14:51:00Z

Compiler changes look contained to l4re, so I'm inclined to approve as soon as the library comments are addressed.

farao · 2026-07-30T13:54:32Z

Yeah, thanks for the review :) I fixed the two comments.

joboet · 2026-07-30T14:05:00Z

@bors r=@saethlin,joboet

rust-bors · 2026-07-30T14:05:04Z

📌 Commit 1ba6fd2 has been approved by saethlin,joboet

It is now in the queue for this repository.

Revive L4Re target This revives the target for the L4Re OS. It changes the way, linking is done and adds aarch64 support and documentation including a maintainer for the target. The update of the libc crate is necessary since only in 0.2.179 and higher is the fixed support for L4Re on uclibc.

Rollup of 14 pull requests Successful merges: - #159817 (Rename splat to avoid stable name collisions) - #160204 (Sync from portable simd 2026 07 30) - #150885 (Revive L4Re target) - #158057 (Don't escape U+FF9E and U+FF9F in `escape_debug_ext`) - #160125 (Fix typing mode handling in transmute checks and rustc_dump_layout) - #160152 (Create on-demand CI job for testing EC2 instances) - #159214 (std: improve the documentation of the random feature) - #159818 (Resolve vars before calling `unnormalized_obligations`) - #160040 (Split function parsing out of `item.rs` to a new module.) - #160044 (Add regression tests for fixed dead-code issues) - #160144 (renovate: group lockfiles PRs) - #160149 (Fix Windows on Arm PAC default) - #160175 (Try to recover less from incorrectly parsed const arg) - #160181 (Mark `Tuple` and `FnPtr` traits `#[fundamental]`)

JonathanBrouwer · 2026-07-30T22:06:06Z

💔 I suspect this PR failed tests as part of a rollup
@bors r-

After fixing the problem, consider running a try job for the failed job before re-approving.

Link to failure: #160222 (comment)

rust-bors · 2026-07-30T22:06:14Z

This pull request was unapproved.

This PR was contained in a rollup (#160222), which was unapproved.

View changes since this unapproval

Fixes the builds of rustc and library/std for the L4Re target OS. A major change was done in linking binaries: The need for the L4Bender tool was removed and linking parameters are now fully configured in the rustc target config.

rustbot · 2026-08-03T15:48:36Z

This PR was rebased onto a different main commit. Here's a range-diff highlighting what actually changed.

Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers.

farao · 2026-08-03T15:57:51Z

@joboet or @saethlin: I found out the issue why it failed - it was a pre-existing code structuring problem that just faced now due to my changes:

crate::sys::unsupported was depending on the platform either a function or a module containing an unsupported function. I resolved this by removing the module unsupported around the unsupported* functions in library/std/src/sys/pal/unix/mod.rs. Is this fix ok for you?

JonathanBrouwer · 2026-08-03T17:21:49Z

@bors try jobs=dist-various-2

Revive L4Re target try-job: dist-various-2

rust-bors · 2026-08-03T17:55:24Z

💔 Test for 983bc76 failed: CI. Failed job:

try - dist-various-2 (web logs, enhanced plaintext logs)

rust-log-analyzer · 2026-08-03T17:55:26Z

The job dist-various-2 failed! Check out the build log: (web) (plain enhanced) (plain)

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

rustbot assigned joboet Jan 9, 2026

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farao force-pushed the main branch from 7e76bdd to e66e2d0 Compare January 10, 2026 17:21

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farao force-pushed the main branch from e66e2d0 to 9036110 Compare January 10, 2026 17:25

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farao force-pushed the main branch from 9036110 to cd3369f Compare January 14, 2026 11:44

joboet reviewed Jan 22, 2026

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rustbot added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Feb 7, 2026

rustbot assigned adwinwhite and unassigned joboet Jul 29, 2026

saethlin assigned saethlin and unassigned adwinwhite Jul 29, 2026

farao force-pushed the main branch from af5aece to 1ba6fd2 Compare July 30, 2026 13:52

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 Jul 30, 2026

jhpratt mentioned this pull request Jul 30, 2026

Rollup of 14 pull requests #160222

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farao and others added 3 commits August 3, 2026 17:10

Add documentation and maintainer for L4Re target

01eba31

Add aarch64 architecture for L4Re target

23c0d1a

L4Re: Repair build and move to rustc linking

105a4af

Fixes the builds of rustc and library/std for the L4Re target OS. A major change was done in linking binaries: The need for the L4Bender tool was removed and linking parameters are now fully configured in the rustc target config.

farao force-pushed the main branch from 1ba6fd2 to 105a4af Compare August 3, 2026 15:48

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rust-bors Bot pushed a commit that referenced this pull request Aug 3, 2026

Auto merge of #150885 - farao:main, r=<try>

983bc76

Revive L4Re target try-job: dist-various-2

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