fix(bootstrap/darwin): fix rpath for distributed LLD by rami3l · Pull Request #163954 · rust-lang/rust

rami3l · 2026-10-07T16:41:35Z

Closes #163947 by mirroring the existing rpath tweak for linux on darwin.

Concerns

Is there an easy way to reliably test the effect of this fix (there doesn't seem to be dist tests for darwin in particular)? I'd love to add one if possible.

rami3l · 2026-10-08T13:18:16Z

Verification

Verified manually via the following sequence:

Before

> otool -l build/aarch64-apple-darwin/stage2/lib/rustlib/aarch64-apple-darwin/bin/rust-lld | 'grep' -A3 LC_RPATH
          cmd LC_RPATH
      cmdsize 32
         path @loader_path/../lib (offset 12)
Load command 18
          cmd LC_RPATH
      cmdsize 80
         path /Users/runner/work/rust/rust/build/aarch64-apple-darwin/llvm/lib (offset 12)
Load command 19
> ls -lh build/host/stage2/lib/libLLVM.dylib
-rw-r--r--  7 rami3l  staff   137M Oct  3 22:27 build/host/stage2/lib/libLLVM.dylib

After

> ./x.py build --stage 2 compiler/rustc
[..]
> otool -l build/aarch64-apple-darwin/stage2/lib/rustlib/aarch64-apple-darwin/bin/rust-lld | 'grep' -A3 LC_RPATH
          cmd LC_RPATH
      cmdsize 40
         path @loader_path/../../../ (offset 12)
Load command 19
          cmd LC_RPATH
      cmdsize 32
         path @loader_path/../lib (offset 12)
Load command 20
          cmd LC_RPATH
      cmdsize 88
         path [local]/rust/build/aarch64-apple-darwin/llvm/lib (offset 12)
Load command 21

As such, I think this PR can be considered ready for review.

For the possibility of writing a regression test about it, I consulted @Kobzol and his conclusion was that that may be too much for this small fix.

rustbot · 2026-10-08T13:22:40Z

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

rustbot · 2026-10-08T13:22:44Z

r? @clubby789

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rami3l · 2026-10-08T15:58:25Z

r? @Kobzol for maximal context retention from #163947.

rustbot · 2026-10-08T15:58:31Z

Kobzol is not on the review rotation at the moment.
They may take a while to respond.

Kobzol · 2026-10-08T22:54:27Z

@bors r+

rust-bors · 2026-10-08T22:54:30Z

📌 Commit 7b151cf has been approved by Kobzol

It is now in the queue for this repository.

jieyouxu · 2026-10-09T02:09:15Z

We'll almost certainly have a stable point release this cycle (#163917), so we should backport this too IMO. Thanks @rami3l for the fix.
@rustbot label: +stable-nominated +beta-nominated

…=Kobzol fix(bootstrap/darwin): fix rpath for distributed LLD Closes rust-lang#163947 by mirroring the existing rpath tweak for linux on darwin. ## Concerns - [ ] Is there an easy way to reliably test the effect of this fix (there doesn't seem to be dist tests for darwin in particular)? I'd love to add one if possible.

…uwer Rollup of 7 pull requests Successful merges: - #162652 (Syntactically reject leading parenthesized precise capturing lists in bare trait object types (`(use<…>)+`)) - #163337 (MIR move elimination [3/6]: PreciseLiveness) - #163954 (fix(bootstrap/darwin): fix rpath for distributed LLD) - #163956 (Pass the unremapped path to the `rustc` invocation for doctests) - #163634 (move overflow lint computation into decorator) - #163727 (rigid aliases to non-rigid for fully normalized check) - #163745 (replace `fully_monomorphized` with `cx.typing_env()`)

…=Kobzol fix(bootstrap/darwin): fix rpath for distributed LLD Closes rust-lang#163947 by mirroring the existing rpath tweak for linux on darwin. ## Concerns - [ ] Is there an easy way to reliably test the effect of this fix (there doesn't seem to be dist tests for darwin in particular)? I'd love to add one if possible.

…uwer Rollup of 11 pull requests Successful merges: - #162652 (Syntactically reject leading parenthesized precise capturing lists in bare trait object types (`(use<…>)+`)) - #163337 (MIR move elimination [3/6]: PreciseLiveness) - #163954 (fix(bootstrap/darwin): fix rpath for distributed LLD) - #163956 (Pass the unremapped path to the `rustc` invocation for doctests) - #163634 (move overflow lint computation into decorator) - #163666 (Updates the expect message library/core/src/time.rs) - #163727 (rigid aliases to non-rigid for fully normalized check) - #163745 (replace `fully_monomorphized` with `cx.typing_env()`) - #164000 (When mentioning that closure doesn't implement trait, point at closure) - #164007 ([rustdoc] Prefer local paths over remote ones when foreign item is locally reexported) - #164017 (cg_llvm: Avoid some explicit casts to `*const c_char`)

…=Kobzol fix(bootstrap/darwin): fix rpath for distributed LLD Closes rust-lang#163947 by mirroring the existing rpath tweak for linux on darwin. ## Concerns - [ ] Is there an easy way to reliably test the effect of this fix (there doesn't seem to be dist tests for darwin in particular)? I'd love to add one if possible.

…uwer Rollup of 14 pull requests Successful merges: - #162652 (Syntactically reject leading parenthesized precise capturing lists in bare trait object types (`(use<…>)+`)) - #163337 (MIR move elimination [3/6]: PreciseLiveness) - #163954 (fix(bootstrap/darwin): fix rpath for distributed LLD) - #163193 (cfi: mangle `f128` as `e` rather than `g` on platforms without `_Float128`) - #163634 (move overflow lint computation into decorator) - #163666 (Updates the expect message library/core/src/time.rs) - #163727 (rigid aliases to non-rigid for fully normalized check) - #163745 (replace `fully_monomorphized` with `cx.typing_env()`) - #163912 (Fix debug assert failure in `note_obligation_cause_code_inner`) - #163972 (const-eval: ICE when we hit a non-const fn) - #164000 (When mentioning that closure doesn't implement trait, point at closure) - #164007 ([rustdoc] Prefer local paths over remote ones when foreign item is locally reexported) - #164017 (cg_llvm: Avoid some explicit casts to `*const c_char`) - #164025 (Less `CanonicalVarValues`)

…=Kobzol fix(bootstrap/darwin): fix rpath for distributed LLD Closes rust-lang#163947 by mirroring the existing rpath tweak for linux on darwin. ## Concerns - [ ] Is there an easy way to reliably test the effect of this fix (there doesn't seem to be dist tests for darwin in particular)? I'd love to add one if possible.

…uwer Rollup of 14 pull requests Successful merges: - #162652 (Syntactically reject leading parenthesized precise capturing lists in bare trait object types (`(use<…>)+`)) - #163337 (MIR move elimination [3/6]: PreciseLiveness) - #163954 (fix(bootstrap/darwin): fix rpath for distributed LLD) - #163193 (cfi: mangle `f128` as `e` rather than `g` on platforms without `_Float128`) - #163634 (move overflow lint computation into decorator) - #163666 (Updates the expect message library/core/src/time.rs) - #163727 (rigid aliases to non-rigid for fully normalized check) - #163745 (replace `fully_monomorphized` with `cx.typing_env()`) - #163912 (Fix debug assert failure in `note_obligation_cause_code_inner`) - #163950 (don't treat inherited opaques as defining) - #164000 (When mentioning that closure doesn't implement trait, point at closure) - #164007 ([rustdoc] Prefer local paths over remote ones when foreign item is locally reexported) - #164017 (cg_llvm: Avoid some explicit casts to `*const c_char`) - #164025 (Less `CanonicalVarValues`)

…uwer Rollup of 24 pull requests Successful merges: - #161998 ( Support type-relative assoc item paths in generic param defaults & const param types) - #162106 (Helpful suggestions for incorrect address-of mutability (2)) - #162652 (Syntactically reject leading parenthesized precise capturing lists in bare trait object types (`(use<…>)+`)) - #163337 (MIR move elimination [3/6]: PreciseLiveness) - #163938 (-Zassumptions-on-binders: rewrite alias outlives constraints more goodly) - #163939 (Better debug impls for some assumptions on binders types) - #163954 (fix(bootstrap/darwin): fix rpath for distributed LLD) - #163956 (Pass the unremapped path to the `rustc` invocation for doctests) - #164042 (Allow testing cg-gcc on any target) - #162443 (Do not retain `Normalization` goal errors in nested goals for `BestObligationVisitor:: non_trivial_candidates `) - #162908 (Fix - const parameters rejected when identical) - #163193 (cfi: mangle `f128` as `e` rather than `g` on platforms without `_Float128`) - #163634 (move overflow lint computation into decorator) - #163666 (Updates the expect message library/core/src/time.rs) - #163727 (rigid aliases to non-rigid for fully normalized check) - #163745 (replace `fully_monomorphized` with `cx.typing_env()`) - #163912 (Fix debug assert failure in `note_obligation_cause_code_inner`) - #163950 (don't treat inherited opaques as defining) - #163972 (const-eval: ICE when we hit a non-const fn) - #164000 (When mentioning that closure doesn't implement trait, point at closure) - #164007 ([rustdoc] Prefer local paths over remote ones when foreign item is locally reexported) - #164008 (properly ignore the current goal's usages) - #164017 (cg_llvm: Avoid some explicit casts to `*const c_char`) - #164025 (Less `CanonicalVarValues`)

Rollup merge of #163954 - rami3l:fix/bootstrap-darwin-lld, r=Kobzol fix(bootstrap/darwin): fix rpath for distributed LLD Closes #163947 by mirroring the existing rpath tweak for linux on darwin. ## Concerns - [ ] Is there an easy way to reliably test the effect of this fix (there doesn't seem to be dist tests for darwin in particular)? I'd love to add one if possible.

`rust-objcopy` is a renamed copy of `llvm-objcopy` shipped in the `rustc` component at `lib/rustlib/$host/bin`. When LLVM is linked dynamically it only carries LLVM's default `$ORIGIN/../lib` (`@loader_path/../lib` on darwin) rpath, which does not reach the `libLLVM` shipped in `lib/`, so it fails to load outside rustup's library path overrides. Mirror the rpath entry `Lld::run` already adds for `rust-lld` (rust-lang#163954) on the LLVM tools themselves. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

rustbot added A-run-make Area: port run-make Makefiles to rmake.rs S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Oct 7, 2026

rami3l force-pushed the fix/bootstrap-darwin-lld branch from c260a22 to 271295a Compare October 7, 2026 17:05

rustbot added the T-bootstrap Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap) label Oct 7, 2026

rami3l marked this pull request as ready for review October 8, 2026 13:22

rustbot added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Oct 8, 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 Oct 8, 2026

rustbot assigned clubby789 Oct 8, 2026

fix(bootstrap/darwin): fix rpath for distributed LLD

7b151cf

rami3l force-pushed the fix/bootstrap-darwin-lld branch from 271295a to 7b151cf Compare October 8, 2026 13:25

rami3l removed the A-run-make Area: port run-make Makefiles to rmake.rs label Oct 8, 2026

sgasho mentioned this pull request Oct 8, 2026

rust-lld on aarch64-apple-darwin cannot load libLLVM.dylib when the toolchain rustc is invoked directly (1.99.0, regression from 1.96.1) #163947

Closed

rustbot assigned Kobzol and unassigned clubby789 Oct 8, 2026

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 Oct 8, 2026

rustbot added beta-nominated Nominated for backporting to the compiler in the beta channel. stable-nominated Nominated for backporting to the compiler in the stable channel. labels Oct 9, 2026

JonathanBrouwer mentioned this pull request Oct 9, 2026

Rollup of 7 pull requests #164015

Closed

JonathanBrouwer mentioned this pull request Oct 9, 2026

Rollup of 11 pull requests #164024

Closed

JonathanBrouwer mentioned this pull request Oct 9, 2026

Rollup of 14 pull requests #164026

Closed

JonathanBrouwer mentioned this pull request Oct 9, 2026

Rollup of 14 pull requests #164027

Closed

JonathanBrouwer mentioned this pull request Oct 9, 2026

Rollup of 14 pull requests #164039

Closed

JonathanBrouwer mentioned this pull request Oct 9, 2026

Rollup of 24 pull requests #164052

Merged

rust-bors Bot merged commit bd1692d into rust-lang:main Oct 9, 2026
14 checks passed

rustbot added this to the 1.101.0 milestone Oct 9, 2026

This was referenced Oct 10, 2026

rust-objcopy on aarch64-apple-darwin cannot load libLLVM.dylib (rpath @loader_path/../lib); not covered by #163954 #164063

Open

bootstrap: add an rpath to libLLVM for the distributed rust-objcopy #164064

Open

rami3l deleted the fix/bootstrap-darwin-lld branch October 10, 2026 06:51

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fix(bootstrap/darwin): fix rpath for distributed LLD - #163954

fix(bootstrap/darwin): fix rpath for distributed LLD#163954
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