docs(guide): Point out tools for reducing dependencies#16078
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weihanglo merged 1 commit intorust-lang:masterfrom Oct 10, 2025
Merged
docs(guide): Point out tools for reducing dependencies#16078weihanglo merged 1 commit intorust-lang:masterfrom
weihanglo merged 1 commit intorust-lang:masterfrom
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This is a fairly non-invasive change people can make to speed up builds. My big motivation for writing this is I saw mention of https://crates.io/crates/cargo-unused-features and wanted this in first before calling that out.
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CC @Kobzol |
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Kobzol
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Makes sense! TIL about cargo shear.
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| > *Note:* native support for this in Cargo is being tracked in [#15813](https://github.com/rust-lang/cargo/issues/15813). | ||
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| Trade-offs: |
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I'm not sure how much the trade-offs section makes sense here, as it's not a config that you would apply and it then affects your crate, but rather you just use a tool that might have false negatives/positives, and that's about it. But I also don't think it's super important.
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It provided a nice place to
- Call out the benefits
- Call out false positives and false negatives
weihanglo
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Oct 10, 2025
| When changing code, | ||
| it can be easy to miss that a dependency is no longer used and can be removed. | ||
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| > *Note:* native support for this in Cargo is being tracked in [#15813](https://github.com/rust-lang/cargo/issues/15813). |
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nit: We normally use bold for note
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Update cargo submodule 22 commits in 801d9b4981dd07e3aecdca1ab86834c13615737e..81c3f77a467359c8be6bc747dc93ec66a6e4ce11 2025-10-04 13:30:15 +0000 to 2025-10-10 18:41:02 +0000 - docs(changelog): literal host-tuple support (rust-lang/cargo#16033) - refactor: Define cargo script's target-dir using build-dir templating (rust-lang/cargo#16073) - feat(build-dir): Reorganize build-dir layout (rust-lang/cargo#15947) - refactor: unflatten `(String, Def)` to `ConfigValue` (rust-lang/cargo#16084) - fix(tree): Switch from `--depth public` to `--edges public` (rust-lang/cargo#16081) - docs(guide): Point out tools for reducing dependencies (rust-lang/cargo#16078) - Allow to rustfix unused_variables lint. (rust-lang/cargo#16082) - Fix test that assumes `CARGO_CFG_TARGET_FAMILY` is a single value (rust-lang/cargo#16079) - Fix regression that swallowed json diagnostic explanations (rust-lang/cargo#16075) - docs(ref): fix link to clippy incompatible_msrv lint (rust-lang/cargo#16077) - Convert a few more diagnostics to reports (rust-lang/cargo#16066) - fix(support): Add track_caller to know the actual failure (rust-lang/cargo#16069) - fix(add): Report a missing source error for workspace dependencies (rust-lang/cargo#16063) - fix(script): Default bin.name to package.name (rust-lang/cargo#16064) - refactor(gctx): ConfigValue getter cleanup (rust-lang/cargo#16067) - Fix unsafe_op_in_unsafe_fn for Windows (rust-lang/cargo#16058) - Consider public dependencies when choosing a version in cargo add (rust-lang/cargo#1… (rust-lang/cargo#15966) - docs: clarify panic-immediate-abort can be used in config (rust-lang/cargo#16054) - fix(timings): compute codegen start time to draw dep lines (rust-lang/cargo#16055) - chore: Added tracing span for build script execution (rust-lang/cargo#16053) - test: null-terminated path for reserved windows name detection (rust-lang/cargo#16052) - feat (publish): deprecate `--token` option (rust-lang/cargo#16046) r? ghost
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Update cargo submodule 22 commits in 801d9b4981dd07e3aecdca1ab86834c13615737e..81c3f77a467359c8be6bc747dc93ec66a6e4ce11 2025-10-04 13:30:15 +0000 to 2025-10-10 18:41:02 +0000 - docs(changelog): literal host-tuple support (rust-lang/cargo#16033) - refactor: Define cargo script's target-dir using build-dir templating (rust-lang/cargo#16073) - feat(build-dir): Reorganize build-dir layout (rust-lang/cargo#15947) - refactor: unflatten `(String, Def)` to `ConfigValue` (rust-lang/cargo#16084) - fix(tree): Switch from `--depth public` to `--edges public` (rust-lang/cargo#16081) - docs(guide): Point out tools for reducing dependencies (rust-lang/cargo#16078) - Allow to rustfix unused_variables lint. (rust-lang/cargo#16082) - Fix test that assumes `CARGO_CFG_TARGET_FAMILY` is a single value (rust-lang/cargo#16079) - Fix regression that swallowed json diagnostic explanations (rust-lang/cargo#16075) - docs(ref): fix link to clippy incompatible_msrv lint (rust-lang/cargo#16077) - Convert a few more diagnostics to reports (rust-lang/cargo#16066) - fix(support): Add track_caller to know the actual failure (rust-lang/cargo#16069) - fix(add): Report a missing source error for workspace dependencies (rust-lang/cargo#16063) - fix(script): Default bin.name to package.name (rust-lang/cargo#16064) - refactor(gctx): ConfigValue getter cleanup (rust-lang/cargo#16067) - Fix unsafe_op_in_unsafe_fn for Windows (rust-lang/cargo#16058) - Consider public dependencies when choosing a version in cargo add (rust-lang/cargo#1… (rust-lang/cargo#15966) - docs: clarify panic-immediate-abort can be used in config (rust-lang/cargo#16054) - fix(timings): compute codegen start time to draw dep lines (rust-lang/cargo#16055) - chore: Added tracing span for build script execution (rust-lang/cargo#16053) - test: null-terminated path for reserved windows name detection (rust-lang/cargo#16052) - feat (publish): deprecate `--token` option (rust-lang/cargo#16046) r? ghost
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Update cargo submodule 22 commits in 801d9b4981dd07e3aecdca1ab86834c13615737e..81c3f77a467359c8be6bc747dc93ec66a6e4ce11 2025-10-04 13:30:15 +0000 to 2025-10-10 18:41:02 +0000 - docs(changelog): literal host-tuple support (rust-lang/cargo#16033) - refactor: Define cargo script's target-dir using build-dir templating (rust-lang/cargo#16073) - feat(build-dir): Reorganize build-dir layout (rust-lang/cargo#15947) - refactor: unflatten `(String, Def)` to `ConfigValue` (rust-lang/cargo#16084) - fix(tree): Switch from `--depth public` to `--edges public` (rust-lang/cargo#16081) - docs(guide): Point out tools for reducing dependencies (rust-lang/cargo#16078) - Allow to rustfix unused_variables lint. (rust-lang/cargo#16082) - Fix test that assumes `CARGO_CFG_TARGET_FAMILY` is a single value (rust-lang/cargo#16079) - Fix regression that swallowed json diagnostic explanations (rust-lang/cargo#16075) - docs(ref): fix link to clippy incompatible_msrv lint (rust-lang/cargo#16077) - Convert a few more diagnostics to reports (rust-lang/cargo#16066) - fix(support): Add track_caller to know the actual failure (rust-lang/cargo#16069) - fix(add): Report a missing source error for workspace dependencies (rust-lang/cargo#16063) - fix(script): Default bin.name to package.name (rust-lang/cargo#16064) - refactor(gctx): ConfigValue getter cleanup (rust-lang/cargo#16067) - Fix unsafe_op_in_unsafe_fn for Windows (rust-lang/cargo#16058) - Consider public dependencies when choosing a version in cargo add (rust-lang/cargo#1… (rust-lang/cargo#15966) - docs: clarify panic-immediate-abort can be used in config (rust-lang/cargo#16054) - fix(timings): compute codegen start time to draw dep lines (rust-lang/cargo#16055) - chore: Added tracing span for build script execution (rust-lang/cargo#16053) - test: null-terminated path for reserved windows name detection (rust-lang/cargo#16052) - feat (publish): deprecate `--token` option (rust-lang/cargo#16046) r? ghost
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Update cargo submodule 22 commits in 801d9b4981dd07e3aecdca1ab86834c13615737e..81c3f77a467359c8be6bc747dc93ec66a6e4ce11 2025-10-04 13:30:15 +0000 to 2025-10-10 18:41:02 +0000 - docs(changelog): literal host-tuple support (rust-lang/cargo#16033) - refactor: Define cargo script's target-dir using build-dir templating (rust-lang/cargo#16073) - feat(build-dir): Reorganize build-dir layout (rust-lang/cargo#15947) - refactor: unflatten `(String, Def)` to `ConfigValue` (rust-lang/cargo#16084) - fix(tree): Switch from `--depth public` to `--edges public` (rust-lang/cargo#16081) - docs(guide): Point out tools for reducing dependencies (rust-lang/cargo#16078) - Allow to rustfix unused_variables lint. (rust-lang/cargo#16082) - Fix test that assumes `CARGO_CFG_TARGET_FAMILY` is a single value (rust-lang/cargo#16079) - Fix regression that swallowed json diagnostic explanations (rust-lang/cargo#16075) - docs(ref): fix link to clippy incompatible_msrv lint (rust-lang/cargo#16077) - Convert a few more diagnostics to reports (rust-lang/cargo#16066) - fix(support): Add track_caller to know the actual failure (rust-lang/cargo#16069) - fix(add): Report a missing source error for workspace dependencies (rust-lang/cargo#16063) - fix(script): Default bin.name to package.name (rust-lang/cargo#16064) - refactor(gctx): ConfigValue getter cleanup (rust-lang/cargo#16067) - Fix unsafe_op_in_unsafe_fn for Windows (rust-lang/cargo#16058) - Consider public dependencies when choosing a version in cargo add (rust-lang/cargo#1… (rust-lang/cargo#15966) - docs: clarify panic-immediate-abort can be used in config (rust-lang/cargo#16054) - fix(timings): compute codegen start time to draw dep lines (rust-lang/cargo#16055) - chore: Added tracing span for build script execution (rust-lang/cargo#16053) - test: null-terminated path for reserved windows name detection (rust-lang/cargo#16052) - feat (publish): deprecate `--token` option (rust-lang/cargo#16046) r? ghost
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### What does this PR try to resolve? Helps users find ways to identify unused features in dependencies. This also pulls in - General improvements from #15991 (in particular, the grouping of links with content since this was going to make it worse) - Review feedback from #16078 ### How to test and review this PR?
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Update cargo submodule 22 commits in 801d9b4981dd07e3aecdca1ab86834c13615737e..81c3f77a467359c8be6bc747dc93ec66a6e4ce11 2025-10-04 13:30:15 +0000 to 2025-10-10 18:41:02 +0000 - docs(changelog): literal host-tuple support (rust-lang/cargo#16033) - refactor: Define cargo script's target-dir using build-dir templating (rust-lang/cargo#16073) - feat(build-dir): Reorganize build-dir layout (rust-lang/cargo#15947) - refactor: unflatten `(String, Def)` to `ConfigValue` (rust-lang/cargo#16084) - fix(tree): Switch from `--depth public` to `--edges public` (rust-lang/cargo#16081) - docs(guide): Point out tools for reducing dependencies (rust-lang/cargo#16078) - Allow to rustfix unused_variables lint. (rust-lang/cargo#16082) - Fix test that assumes `CARGO_CFG_TARGET_FAMILY` is a single value (rust-lang/cargo#16079) - Fix regression that swallowed json diagnostic explanations (rust-lang/cargo#16075) - docs(ref): fix link to clippy incompatible_msrv lint (rust-lang/cargo#16077) - Convert a few more diagnostics to reports (rust-lang/cargo#16066) - fix(support): Add track_caller to know the actual failure (rust-lang/cargo#16069) - fix(add): Report a missing source error for workspace dependencies (rust-lang/cargo#16063) - fix(script): Default bin.name to package.name (rust-lang/cargo#16064) - refactor(gctx): ConfigValue getter cleanup (rust-lang/cargo#16067) - Fix unsafe_op_in_unsafe_fn for Windows (rust-lang/cargo#16058) - Consider public dependencies when choosing a version in cargo add (rust-lang/cargo#1… (rust-lang/cargo#15966) - docs: clarify panic-immediate-abort can be used in config (rust-lang/cargo#16054) - fix(timings): compute codegen start time to draw dep lines (rust-lang/cargo#16055) - chore: Added tracing span for build script execution (rust-lang/cargo#16053) - test: null-terminated path for reserved windows name detection (rust-lang/cargo#16052) - feat (publish): deprecate `--token` option (rust-lang/cargo#16046) r? ghost
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Update cargo submodule 22 commits in 801d9b4981dd07e3aecdca1ab86834c13615737e..81c3f77a467359c8be6bc747dc93ec66a6e4ce11 2025-10-04 13:30:15 +0000 to 2025-10-10 18:41:02 +0000 - docs(changelog): literal host-tuple support (rust-lang/cargo#16033) - refactor: Define cargo script's target-dir using build-dir templating (rust-lang/cargo#16073) - feat(build-dir): Reorganize build-dir layout (rust-lang/cargo#15947) - refactor: unflatten `(String, Def)` to `ConfigValue` (rust-lang/cargo#16084) - fix(tree): Switch from `--depth public` to `--edges public` (rust-lang/cargo#16081) - docs(guide): Point out tools for reducing dependencies (rust-lang/cargo#16078) - Allow to rustfix unused_variables lint. (rust-lang/cargo#16082) - Fix test that assumes `CARGO_CFG_TARGET_FAMILY` is a single value (rust-lang/cargo#16079) - Fix regression that swallowed json diagnostic explanations (rust-lang/cargo#16075) - docs(ref): fix link to clippy incompatible_msrv lint (rust-lang/cargo#16077) - Convert a few more diagnostics to reports (rust-lang/cargo#16066) - fix(support): Add track_caller to know the actual failure (rust-lang/cargo#16069) - fix(add): Report a missing source error for workspace dependencies (rust-lang/cargo#16063) - fix(script): Default bin.name to package.name (rust-lang/cargo#16064) - refactor(gctx): ConfigValue getter cleanup (rust-lang/cargo#16067) - Fix unsafe_op_in_unsafe_fn for Windows (rust-lang/cargo#16058) - Consider public dependencies when choosing a version in cargo add (rust-lang/cargo#1… (rust-lang/cargo#15966) - docs: clarify panic-immediate-abort can be used in config (rust-lang/cargo#16054) - fix(timings): compute codegen start time to draw dep lines (rust-lang/cargo#16055) - chore: Added tracing span for build script execution (rust-lang/cargo#16053) - test: null-terminated path for reserved windows name detection (rust-lang/cargo#16052) - feat (publish): deprecate `--token` option (rust-lang/cargo#16046) r? ghost
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Update cargo submodule 22 commits in 801d9b4981dd07e3aecdca1ab86834c13615737e..81c3f77a467359c8be6bc747dc93ec66a6e4ce11 2025-10-04 13:30:15 +0000 to 2025-10-10 18:41:02 +0000 - docs(changelog): literal host-tuple support (rust-lang/cargo#16033) - refactor: Define cargo script's target-dir using build-dir templating (rust-lang/cargo#16073) - feat(build-dir): Reorganize build-dir layout (rust-lang/cargo#15947) - refactor: unflatten `(String, Def)` to `ConfigValue` (rust-lang/cargo#16084) - fix(tree): Switch from `--depth public` to `--edges public` (rust-lang/cargo#16081) - docs(guide): Point out tools for reducing dependencies (rust-lang/cargo#16078) - Allow to rustfix unused_variables lint. (rust-lang/cargo#16082) - Fix test that assumes `CARGO_CFG_TARGET_FAMILY` is a single value (rust-lang/cargo#16079) - Fix regression that swallowed json diagnostic explanations (rust-lang/cargo#16075) - docs(ref): fix link to clippy incompatible_msrv lint (rust-lang/cargo#16077) - Convert a few more diagnostics to reports (rust-lang/cargo#16066) - fix(support): Add track_caller to know the actual failure (rust-lang/cargo#16069) - fix(add): Report a missing source error for workspace dependencies (rust-lang/cargo#16063) - fix(script): Default bin.name to package.name (rust-lang/cargo#16064) - refactor(gctx): ConfigValue getter cleanup (rust-lang/cargo#16067) - Fix unsafe_op_in_unsafe_fn for Windows (rust-lang/cargo#16058) - Consider public dependencies when choosing a version in cargo add (rust-lang/cargo#1… (rust-lang/cargo#15966) - docs: clarify panic-immediate-abort can be used in config (rust-lang/cargo#16054) - fix(timings): compute codegen start time to draw dep lines (rust-lang/cargo#16055) - chore: Added tracing span for build script execution (rust-lang/cargo#16053) - test: null-terminated path for reserved windows name detection (rust-lang/cargo#16052) - feat (publish): deprecate `--token` option (rust-lang/cargo#16046) r? ghost
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Update cargo submodule 22 commits in 801d9b4981dd07e3aecdca1ab86834c13615737e..81c3f77a467359c8be6bc747dc93ec66a6e4ce11 2025-10-04 13:30:15 +0000 to 2025-10-10 18:41:02 +0000 - docs(changelog): literal host-tuple support (rust-lang/cargo#16033) - refactor: Define cargo script's target-dir using build-dir templating (rust-lang/cargo#16073) - feat(build-dir): Reorganize build-dir layout (rust-lang/cargo#15947) - refactor: unflatten `(String, Def)` to `ConfigValue` (rust-lang/cargo#16084) - fix(tree): Switch from `--depth public` to `--edges public` (rust-lang/cargo#16081) - docs(guide): Point out tools for reducing dependencies (rust-lang/cargo#16078) - Allow to rustfix unused_variables lint. (rust-lang/cargo#16082) - Fix test that assumes `CARGO_CFG_TARGET_FAMILY` is a single value (rust-lang/cargo#16079) - Fix regression that swallowed json diagnostic explanations (rust-lang/cargo#16075) - docs(ref): fix link to clippy incompatible_msrv lint (rust-lang/cargo#16077) - Convert a few more diagnostics to reports (rust-lang/cargo#16066) - fix(support): Add track_caller to know the actual failure (rust-lang/cargo#16069) - fix(add): Report a missing source error for workspace dependencies (rust-lang/cargo#16063) - fix(script): Default bin.name to package.name (rust-lang/cargo#16064) - refactor(gctx): ConfigValue getter cleanup (rust-lang/cargo#16067) - Fix unsafe_op_in_unsafe_fn for Windows (rust-lang/cargo#16058) - Consider public dependencies when choosing a version in cargo add (rust-lang/cargo#1… (rust-lang/cargo#15966) - docs: clarify panic-immediate-abort can be used in config (rust-lang/cargo#16054) - fix(timings): compute codegen start time to draw dep lines (rust-lang/cargo#16055) - chore: Added tracing span for build script execution (rust-lang/cargo#16053) - test: null-terminated path for reserved windows name detection (rust-lang/cargo#16052) - feat (publish): deprecate `--token` option (rust-lang/cargo#16046) r? ghost
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Update cargo submodule 22 commits in 801d9b4981dd07e3aecdca1ab86834c13615737e..81c3f77a467359c8be6bc747dc93ec66a6e4ce11 2025-10-04 13:30:15 +0000 to 2025-10-10 18:41:02 +0000 - docs(changelog): literal host-tuple support (rust-lang/cargo#16033) - refactor: Define cargo script's target-dir using build-dir templating (rust-lang/cargo#16073) - feat(build-dir): Reorganize build-dir layout (rust-lang/cargo#15947) - refactor: unflatten `(String, Def)` to `ConfigValue` (rust-lang/cargo#16084) - fix(tree): Switch from `--depth public` to `--edges public` (rust-lang/cargo#16081) - docs(guide): Point out tools for reducing dependencies (rust-lang/cargo#16078) - Allow to rustfix unused_variables lint. (rust-lang/cargo#16082) - Fix test that assumes `CARGO_CFG_TARGET_FAMILY` is a single value (rust-lang/cargo#16079) - Fix regression that swallowed json diagnostic explanations (rust-lang/cargo#16075) - docs(ref): fix link to clippy incompatible_msrv lint (rust-lang/cargo#16077) - Convert a few more diagnostics to reports (rust-lang/cargo#16066) - fix(support): Add track_caller to know the actual failure (rust-lang/cargo#16069) - fix(add): Report a missing source error for workspace dependencies (rust-lang/cargo#16063) - fix(script): Default bin.name to package.name (rust-lang/cargo#16064) - refactor(gctx): ConfigValue getter cleanup (rust-lang/cargo#16067) - Fix unsafe_op_in_unsafe_fn for Windows (rust-lang/cargo#16058) - Consider public dependencies when choosing a version in cargo add (rust-lang/cargo#1… (rust-lang/cargo#15966) - docs: clarify panic-immediate-abort can be used in config (rust-lang/cargo#16054) - fix(timings): compute codegen start time to draw dep lines (rust-lang/cargo#16055) - chore: Added tracing span for build script execution (rust-lang/cargo#16053) - test: null-terminated path for reserved windows name detection (rust-lang/cargo#16052) - feat (publish): deprecate `--token` option (rust-lang/cargo#16046) r? ghost
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What does this PR try to resolve?
This is a fairly non-invasive change people can make to speed up builds.
How to test and review this PR?
My big motivation for writing this is I saw mention of https://crates.io/crates/cargo-unused-features and wanted this in first before calling that out.