Update bootstrap to use -Zembed-metadata=no instead of -Zno-embed-metadata by dpaoliello · Pull Request #159781 · rust-lang/rust

dpaoliello · 2026-07-23T16:29:48Z

The recent Cargo submodule update picked up rust-lang/cargo#17149

However, bootstrap was still using the old name, resulting in:

Building stage1 library artifacts (stage1 -> stage1, arm64ec-pc-windows-msvc)
error: unknown `-Z` flag specified: no-embed-metadata

Fix is to switch to the rename.

I also removed the diff in the Cranelift setup script, since they must have already hit this issue and no longer need the workaround.

rustbot · 2026-07-23T16:29:51Z

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

cc @bjorn3

rustbot · 2026-07-23T16:29:54Z

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Kobzol · 2026-07-23T16:40:53Z

Ah, this is annoying. On stage0/beta Cargo, the old flag is still used, while if we use the in-tree stage1+ Cargo, we have to use the new flag.

Kobzol · 2026-07-23T16:41:36Z

Maybe we can just temporarily stop using this flag, although I'm not sure whether bootstrap can deal with both the flag being on and off.

bjorn3 · 2026-07-23T16:42:58Z

We can check for the local-rebuild config, right? If that is set, the new cli flag should be used, otherwise the old cli flag.

bjorn3 · 2026-07-23T17:08:16Z

        if matches!(mode, Mode::Std) {
-            cargo.arg("-Zembed-metadata=no");
+            // The `-Zembed-metadata` flag was renamed from `-Zno-embed-metadata`.
+            if build_compiler_stage == 0 {


The same cargo is used for all stages, so checking build_compiler_stage is not correct. local-rebuild should work though. That is what is used to indicate that the bootstrap toolchain (and thus cargo) matches the in-tree one (or is at most a patch release away)

View changes since the review

…adata The recent Cargo submodule update picked up <rust-lang/cargo#17149> However, bootstrap was still using the old name, resulting in: ``` Building stage1 library artifacts (stage1 -> stage1, arm64ec-pc-windows-msvc) error: unknown `-Z` flag specified: no-embed-metadata ``` Fix is to switch to the rename. I also removed the diff in the Cranelift setup script, since they must have already hit this issue and no longer need the workaround.

Kobzol · 2026-07-23T20:27:59Z

Thank you! Let's try.

@bors r+ rollup=iffy

rust-bors · 2026-07-23T20:28:03Z

📌 Commit fe37a8a has been approved by Kobzol

It is now in the queue for this repository.

Update bootstrap to use -Zembed-metadata=no instead of -Zno-embed-metadata The recent Cargo submodule update picked up <rust-lang/cargo#17149> However, bootstrap was still using the old name, resulting in: ``` Building stage1 library artifacts (stage1 -> stage1, arm64ec-pc-windows-msvc) error: unknown `-Z` flag specified: no-embed-metadata ``` Fix is to switch to the rename. I also removed the diff in the Cranelift setup script, since they must have already hit this issue and no longer need the workaround.

dpaoliello · 2026-07-24T01:40:47Z

Just validated that this change fixes our internal pipeline as well!

Update bootstrap to use -Zembed-metadata=no instead of -Zno-embed-metadata The recent Cargo submodule update picked up <rust-lang/cargo#17149> However, bootstrap was still using the old name, resulting in: ``` Building stage1 library artifacts (stage1 -> stage1, arm64ec-pc-windows-msvc) error: unknown `-Z` flag specified: no-embed-metadata ``` Fix is to switch to the rename. I also removed the diff in the Cranelift setup script, since they must have already hit this issue and no longer need the workaround.

Rollup of 12 pull requests Successful merges: - #159765 (Avoid spurious rebuilds of JSON docs in bootstrap) - #159781 (Update bootstrap to use -Zembed-metadata=no instead of -Zno-embed-metadata) - #158362 (trait solver: account for universes from replace_bound_vars) - #159173 (Add allowed list check on EII implementations attributes) - #159718 (Make `DocLinkResMap` an `FxIndexMap`) - #159722 ( [rustdoc] Retrieve `cfg_attr` information for derived impls for `doc_cfg` feature) - #155795 (constify `vec![1, 2, 3]` macro) - #157776 (ci: Enable autodiff tests on x86_64 linux) - #158766 (Promote riscv64-unknown-linux-musl to tier 2 with host tools) - #159271 (str: add ASCII fast path to word_to_titlecase) - #159666 (fix(ld64.lld): route version mismatch warnings to linker_info on macOS) - #159667 (Make some parser structured suggestions verbose and tweak their wording)

Rollup of 14 pull requests Successful merges: - #159765 (Avoid spurious rebuilds of JSON docs in bootstrap) - #159781 (Update bootstrap to use -Zembed-metadata=no instead of -Zno-embed-metadata) - #158362 (trait solver: account for universes from replace_bound_vars) - #158372 (rustfmt: Discover modules via `cfg_select!`) - #159173 (Add allowed list check on EII implementations attributes) - #159718 (Make `DocLinkResMap` an `FxIndexMap`) - #159722 ( [rustdoc] Retrieve `cfg_attr` information for derived impls for `doc_cfg` feature) - #159731 (std: Implement futex on wasip3 targets, update target spec) - #159755 (Improve consistency of attribute error messages) - #155795 (constify `vec![1, 2, 3]` macro) - #157776 (ci: Enable autodiff tests on x86_64 linux) - #158766 (Promote riscv64-unknown-linux-musl to tier 2 with host tools) - #159271 (str: add ASCII fast path to word_to_titlecase) - #159667 (Make some parser structured suggestions verbose and tweak their wording)

Rollup merge of #159781 - dpaoliello:noembed, r=Kobzol Update bootstrap to use -Zembed-metadata=no instead of -Zno-embed-metadata The recent Cargo submodule update picked up <rust-lang/cargo#17149> However, bootstrap was still using the old name, resulting in: ``` Building stage1 library artifacts (stage1 -> stage1, arm64ec-pc-windows-msvc) error: unknown `-Z` flag specified: no-embed-metadata ``` Fix is to switch to the rename. I also removed the diff in the Cranelift setup script, since they must have already hit this issue and no longer need the workaround.

rustbot assigned mejrs Jul 23, 2026

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bjorn3 reviewed Jul 23, 2026

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dpaoliello force-pushed the noembed branch from 61225d0 to fe37a8a Compare July 23, 2026 18:11

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 23, 2026

jhpratt mentioned this pull request Jul 23, 2026

Rollup of 11 pull requests #159803

Closed

jhpratt mentioned this pull request Jul 24, 2026

Rollup of 12 pull requests #159806

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jhpratt mentioned this pull request Jul 24, 2026

Rollup of 12 pull requests #159807

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jhpratt mentioned this pull request Jul 24, 2026

Rollup of 14 pull requests #159814

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rust-bors Bot merged commit 5e46148 into rust-lang:main Jul 24, 2026
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rustbot added this to the 1.99.0 milestone Jul 24, 2026

dpaoliello deleted the noembed branch July 24, 2026 17:07

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Update bootstrap to use -Zembed-metadata=no instead of -Zno-embed-metadata#159781

Update bootstrap to use -Zembed-metadata=no instead of -Zno-embed-metadata#159781
rust-bors[bot] merged 1 commit into
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dpaoliello:noembed

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