feat: support @argfile for rustc-fake - #2509
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Seems reasonable, thank you. Left one comment.
This PR includes * A verbatim copy of `arg_file_command.rs` from rust-lang/rust * adapted copies of some other helpers from bootstrap. This found because we tried to enable new build-dir layout for nightly in Cargo, but failed with ``` error: Unrecognized option: 'skip-this-rustc' ``` I _guess_ this was the root cause. See * https://triage.rust-lang.org/gha-logs/rust-lang/rust/89681531404 * rust-lang/rust#159857 (comment)
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Update cargo submodule ## src/tools/cargo 20 commits in 3efb1f477e99b42974b982d939fd100303cdf7db..a09737c688e6b643b3a2e185d076bb4a298d6965 2026-07-17 23:53:19 +0000 to 2026-07-26 15:00:33 +0000 - fix(cli): don't panic during completions when rustup is unavailable (rust-lang/cargo#17263) - docs(workspace): add recommended structure to members field (rust-lang/cargo#17166) - Update cargo-fetch.md to remove cargo-prefetch reference (rust-lang/cargo#16568) - chore: bump to `libgit2-sys@0.18.7+1.9.6` (rust-lang/cargo#17259) - Enable build-dir layout v2 on nightly by default (rust-lang/cargo#17258) - fix(path): clarify error message when path dependency has wrong package (rust-lang/cargo#16927) - fix(toml): warn on hyphenated lint names and duplicates (rust-lang/cargo#17051) - fix(test): gate trim-paths tests on split debuginfo support (rust-lang/cargo#17256) - test(git): Explicitly test for git injection attacks (rust-lang/cargo#17253) - fix(git): Suggest libgit2 if git-cli fails (rust-lang/cargo#17252) - fix(diag): bound transitive unused dependency traversal (rust-lang/cargo#17251) - fix(git): Hide git fetch output without progress (rust-lang/cargo#17243) - revert(lint): Remove `new_implicit_minimum_version_req` (rust-lang/cargo#16321) (rust-lang/cargo#17249) - fix: Add haiku's dylib path (rust-lang/cargo#17248) - Zsh completion: Add `-p` and `--package` flags for `cargo add` (rust-lang/cargo#17247) - refactor(source): Clarify the name of the remote git registry (rust-lang/cargo#17240) - fix(timings): only report units the job queue actually ran (rust-lang/cargo#17238) - Do not include proc-macro deps in rustc search path args (rust-lang/cargo#17236) - chore(deps): update cargo-semver-checks to v0.49.0 (rust-lang/cargo#17237) - rustdoc: rename the doc parts metadata params (rust-lang/cargo#17234) ## src/tools/rustc-perf 12 commits in 0508bdcd37152b28c39b6752828683cdd3f128b5..74ecbcdf88411937a6e39baf2779948565dfd388 2026-07-15 10:20:27 +0000 to 2026-07-27 15:02:48 +0000 - feat: support `@argfile` for rustc-fake (rust-lang/rustc-perf#2509) - Download Clippy when a Clippy profile is requested (rust-lang/rustc-perf#2508) - Add early check for missing rustdoc/clippy in a toolchain (rust-lang/rustc-perf#2507) - Add 2026-07-21 triage (rust-lang/rustc-perf#2506) - use stable extract_if: since 1.87 (rust-lang/rustc-perf#2191) - Update GitHub Actions (rust-lang/rustc-perf#2460) - Update dependency @types/msgpack-lite to v0.1.12 (rust-lang/rustc-perf#2439) - Add 30 day history link to artifact size tab on the compare page (rust-lang/rustc-perf#2505) - Fix selecting color for the bootstrap chart on the toolchain page (rust-lang/rustc-perf#2504) - Add artifact size history chart to toolchain page (rust-lang/rustc-perf#2501) - Parallel frontend compiler support (perf backend only) (rust-lang/rustc-perf#2491) - Run benchmark smoke test for all profiles on Windows on CI (rust-lang/rustc-perf#2503)
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Update cargo submodule ## src/tools/cargo 20 commits in 3efb1f477e99b42974b982d939fd100303cdf7db..a09737c688e6b643b3a2e185d076bb4a298d6965 2026-07-17 23:53:19 +0000 to 2026-07-26 15:00:33 +0000 - fix(cli): don't panic during completions when rustup is unavailable (rust-lang/cargo#17263) - docs(workspace): add recommended structure to members field (rust-lang/cargo#17166) - Update cargo-fetch.md to remove cargo-prefetch reference (rust-lang/cargo#16568) - chore: bump to `libgit2-sys@0.18.7+1.9.6` (rust-lang/cargo#17259) - Enable build-dir layout v2 on nightly by default (rust-lang/cargo#17258) - fix(path): clarify error message when path dependency has wrong package (rust-lang/cargo#16927) - fix(toml): warn on hyphenated lint names and duplicates (rust-lang/cargo#17051) - fix(test): gate trim-paths tests on split debuginfo support (rust-lang/cargo#17256) - test(git): Explicitly test for git injection attacks (rust-lang/cargo#17253) - fix(git): Suggest libgit2 if git-cli fails (rust-lang/cargo#17252) - fix(diag): bound transitive unused dependency traversal (rust-lang/cargo#17251) - fix(git): Hide git fetch output without progress (rust-lang/cargo#17243) - revert(lint): Remove `new_implicit_minimum_version_req` (rust-lang/cargo#16321) (rust-lang/cargo#17249) - fix: Add haiku's dylib path (rust-lang/cargo#17248) - Zsh completion: Add `-p` and `--package` flags for `cargo add` (rust-lang/cargo#17247) - refactor(source): Clarify the name of the remote git registry (rust-lang/cargo#17240) - fix(timings): only report units the job queue actually ran (rust-lang/cargo#17238) - Do not include proc-macro deps in rustc search path args (rust-lang/cargo#17236) - chore(deps): update cargo-semver-checks to v0.49.0 (rust-lang/cargo#17237) - rustdoc: rename the doc parts metadata params (rust-lang/cargo#17234) ## src/tools/rustc-perf 12 commits in 0508bdcd37152b28c39b6752828683cdd3f128b5..74ecbcdf88411937a6e39baf2779948565dfd388 2026-07-15 10:20:27 +0000 to 2026-07-27 15:02:48 +0000 - feat: support `@argfile` for rustc-fake (rust-lang/rustc-perf#2509) - Download Clippy when a Clippy profile is requested (rust-lang/rustc-perf#2508) - Add early check for missing rustdoc/clippy in a toolchain (rust-lang/rustc-perf#2507) - Add 2026-07-21 triage (rust-lang/rustc-perf#2506) - use stable extract_if: since 1.87 (rust-lang/rustc-perf#2191) - Update GitHub Actions (rust-lang/rustc-perf#2460) - Update dependency @types/msgpack-lite to v0.1.12 (rust-lang/rustc-perf#2439) - Add 30 day history link to artifact size tab on the compare page (rust-lang/rustc-perf#2505) - Fix selecting color for the bootstrap chart on the toolchain page (rust-lang/rustc-perf#2504) - Add artifact size history chart to toolchain page (rust-lang/rustc-perf#2501) - Parallel frontend compiler support (perf backend only) (rust-lang/rustc-perf#2491) - Run benchmark smoke test for all profiles on Windows on CI (rust-lang/rustc-perf#2503)
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Update cargo submodule ## src/tools/cargo 23 commits in 3efb1f477e99b42974b982d939fd100303cdf7db..7c83d4cc0953b81d823e47d640c64da9b8bd4fac 2026-07-17 23:53:19 +0000 to 2026-07-29 21:34:53 +0000 - fix: Pass rustdoc flags to final CCI merge step (rust-lang/cargo#17269) - Reworked how we enable the new build-dir layout on nightly (rust-lang/cargo#17272) - Allow setting `-Zembed-metadata` value from the config (rust-lang/cargo#17266) - fix(cli): don't panic during completions when rustup is unavailable (rust-lang/cargo#17263) - docs(workspace): add recommended structure to members field (rust-lang/cargo#17166) - Update cargo-fetch.md to remove cargo-prefetch reference (rust-lang/cargo#16568) - chore: bump to `libgit2-sys@0.18.7+1.9.6` (rust-lang/cargo#17259) - Enable build-dir layout v2 on nightly by default (rust-lang/cargo#17258) - fix(path): clarify error message when path dependency has wrong package (rust-lang/cargo#16927) - fix(toml): warn on hyphenated lint names and duplicates (rust-lang/cargo#17051) - fix(test): gate trim-paths tests on split debuginfo support (rust-lang/cargo#17256) - test(git): Explicitly test for git injection attacks (rust-lang/cargo#17253) - fix(git): Suggest libgit2 if git-cli fails (rust-lang/cargo#17252) - fix(diag): bound transitive unused dependency traversal (rust-lang/cargo#17251) - fix(git): Hide git fetch output without progress (rust-lang/cargo#17243) - revert(lint): Remove `new_implicit_minimum_version_req` (rust-lang/cargo#16321) (rust-lang/cargo#17249) - fix: Add haiku's dylib path (rust-lang/cargo#17248) - Zsh completion: Add `-p` and `--package` flags for `cargo add` (rust-lang/cargo#17247) - refactor(source): Clarify the name of the remote git registry (rust-lang/cargo#17240) - fix(timings): only report units the job queue actually ran (rust-lang/cargo#17238) - Do not include proc-macro deps in rustc search path args (rust-lang/cargo#17236) - chore(deps): update cargo-semver-checks to v0.49.0 (rust-lang/cargo#17237) - rustdoc: rename the doc parts metadata params (rust-lang/cargo#17234) ## src/tools/rustc-perf 12 commits in 0508bdcd37152b28c39b6752828683cdd3f128b5..74ecbcdf88411937a6e39baf2779948565dfd388 2026-07-15 10:20:27 +0000 to 2026-07-27 15:02:48 +0000 - feat: support `@argfile` for rustc-fake (rust-lang/rustc-perf#2509) - Download Clippy when a Clippy profile is requested (rust-lang/rustc-perf#2508) - Add early check for missing rustdoc/clippy in a toolchain (rust-lang/rustc-perf#2507) - Add 2026-07-21 triage (rust-lang/rustc-perf#2506) - use stable extract_if: since 1.87 (rust-lang/rustc-perf#2191) - Update GitHub Actions (rust-lang/rustc-perf#2460) - Update dependency @types/msgpack-lite to v0.1.12 (rust-lang/rustc-perf#2439) - Add 30 day history link to artifact size tab on the compare page (rust-lang/rustc-perf#2505) - Fix selecting color for the bootstrap chart on the toolchain page (rust-lang/rustc-perf#2504) - Add artifact size history chart to toolchain page (rust-lang/rustc-perf#2501) - Parallel frontend compiler support (perf backend only) (rust-lang/rustc-perf#2491) - Run benchmark smoke test for all profiles on Windows on CI (rust-lang/rustc-perf#2503)
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Update cargo submodule ## src/tools/cargo 23 commits in 3efb1f477e99b42974b982d939fd100303cdf7db..7c83d4cc0953b81d823e47d640c64da9b8bd4fac 2026-07-17 23:53:19 +0000 to 2026-07-29 21:34:53 +0000 - fix: Pass rustdoc flags to final CCI merge step (rust-lang/cargo#17269) - Reworked how we enable the new build-dir layout on nightly (rust-lang/cargo#17272) - Allow setting `-Zembed-metadata` value from the config (rust-lang/cargo#17266) - fix(cli): don't panic during completions when rustup is unavailable (rust-lang/cargo#17263) - docs(workspace): add recommended structure to members field (rust-lang/cargo#17166) - Update cargo-fetch.md to remove cargo-prefetch reference (rust-lang/cargo#16568) - chore: bump to `libgit2-sys@0.18.7+1.9.6` (rust-lang/cargo#17259) - Enable build-dir layout v2 on nightly by default (rust-lang/cargo#17258) - fix(path): clarify error message when path dependency has wrong package (rust-lang/cargo#16927) - fix(toml): warn on hyphenated lint names and duplicates (rust-lang/cargo#17051) - fix(test): gate trim-paths tests on split debuginfo support (rust-lang/cargo#17256) - test(git): Explicitly test for git injection attacks (rust-lang/cargo#17253) - fix(git): Suggest libgit2 if git-cli fails (rust-lang/cargo#17252) - fix(diag): bound transitive unused dependency traversal (rust-lang/cargo#17251) - fix(git): Hide git fetch output without progress (rust-lang/cargo#17243) - revert(lint): Remove `new_implicit_minimum_version_req` (rust-lang/cargo#16321) (rust-lang/cargo#17249) - fix: Add haiku's dylib path (rust-lang/cargo#17248) - Zsh completion: Add `-p` and `--package` flags for `cargo add` (rust-lang/cargo#17247) - refactor(source): Clarify the name of the remote git registry (rust-lang/cargo#17240) - fix(timings): only report units the job queue actually ran (rust-lang/cargo#17238) - Do not include proc-macro deps in rustc search path args (rust-lang/cargo#17236) - chore(deps): update cargo-semver-checks to v0.49.0 (rust-lang/cargo#17237) - rustdoc: rename the doc parts metadata params (rust-lang/cargo#17234) ## src/tools/rustc-perf 12 commits in 0508bdcd37152b28c39b6752828683cdd3f128b5..74ecbcdf88411937a6e39baf2779948565dfd388 2026-07-15 10:20:27 +0000 to 2026-07-27 15:02:48 +0000 - feat: support `@argfile` for rustc-fake (rust-lang/rustc-perf#2509) - Download Clippy when a Clippy profile is requested (rust-lang/rustc-perf#2508) - Add early check for missing rustdoc/clippy in a toolchain (rust-lang/rustc-perf#2507) - Add 2026-07-21 triage (rust-lang/rustc-perf#2506) - use stable extract_if: since 1.87 (rust-lang/rustc-perf#2191) - Update GitHub Actions (rust-lang/rustc-perf#2460) - Update dependency @types/msgpack-lite to v0.1.12 (rust-lang/rustc-perf#2439) - Add 30 day history link to artifact size tab on the compare page (rust-lang/rustc-perf#2505) - Fix selecting color for the bootstrap chart on the toolchain page (rust-lang/rustc-perf#2504) - Add artifact size history chart to toolchain page (rust-lang/rustc-perf#2501) - Parallel frontend compiler support (perf backend only) (rust-lang/rustc-perf#2491) - Run benchmark smoke test for all profiles on Windows on CI (rust-lang/rustc-perf#2503)
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This PR includes
arg_file_command.rsfrom rust-lang/rustThis found because we tried to enable new build-dir layout for nightly
in Cargo, but failed with
I guess this was the root cause.
See