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CARGO-DOC(1) General Commands Manual CARGO-DOC(1)

NAME

cargo-doc — Build a package’s documentation

SYNOPSIS

cargo doc [options]

DESCRIPTION

Build the documentation for the local package and all dependencies. The output is placed in target/doc in rustdoc’s usual format.

Note: Documentation generation is cumulative: existing doc files in the target directory are preserved across different cargo doc invocations. To remove existing generated docs, pass --doc to cargo-clean(1).

OPTIONS

Documentation Options

--open

Open the docs in a browser after building them. This will use your default browser unless you define another one in the BROWSER environment variable or use the doc.browser <https://doc.rust-lang.org/cargo/reference/config.html#docbrowser> configuration option.

--no-deps

Do not build documentation for dependencies.

--document-private-items

Include non-public items in the documentation. This will be enabled by default if documenting a binary target.

Package Selection

By default, when no package selection options are given, the packages selected depend on the selected manifest file (based on the current working directory if --manifest-path is not given). If the manifest is the root of a workspace then the workspaces default members are selected, otherwise only the package defined by the manifest will be selected.

The default members of a workspace can be set explicitly with the workspace.default-members key in the root manifest. If this is not set, a virtual workspace will include all workspace members (equivalent to passing --workspace), and a non-virtual workspace will include only the root crate itself.

-p spec…, --package spec…

Document only the specified packages. See cargo-pkgid(1) for the SPEC format. This flag may be specified multiple times and supports common Unix glob patterns like *, ? and []. However, to avoid your shell accidentally expanding glob patterns before Cargo handles them, you must use single quotes or double quotes around each pattern.

--workspace

Document all members in the workspace.

--all

Deprecated alias for --workspace.

--exclude SPEC…

Exclude the specified packages. Must be used in conjunction with the --workspace flag. This flag may be specified multiple times and supports common Unix glob patterns like *, ? and []. However, to avoid your shell accidentally expanding glob patterns before Cargo handles them, you must use single quotes or double quotes around each pattern.

Target Selection

When no target selection options are given, cargo doc will document all binary and library targets of the selected package. The binary will be skipped if its name is the same as the lib target. Binaries are skipped if they have required-features that are missing.

The default behavior can be changed by setting doc = false for the target in the manifest settings. Using target selection options will ignore the doc flag and will always document the given target.

--lib

Document the package’s library.

--bin name…

Document the specified binary. This flag may be specified multiple times and supports common Unix glob patterns.

--bins

Document all binary targets.

--example name…

Document the specified example. This flag may be specified multiple times and supports common Unix glob patterns.

--examples

Document all example targets.

Feature Selection

The feature flags allow you to control which features are enabled. When no feature options are given, the default feature is activated for every selected package.

See the features documentation <https://doc.rust-lang.org/cargo/reference/features.html#command-line-feature-options> for more details.

-F features, --features features

Space or comma separated list of features to activate. Features of workspace members may be enabled with package-name/feature-name syntax. This flag may be specified multiple times, which enables all specified features.

--all-features

Activate all available features of all selected packages.

--no-default-features

Do not activate the default feature of the selected packages.

Compilation Options

--target triple

Document for the specified target architecture. Flag may be specified multiple times. The default is the host architecture. The general format of the triple is <arch><sub>-<vendor>-<sys>-<abi>.

Possible values:

•Any supported target in rustc --print target-list.

•"host-tuple", which will internally be substituted by the host’s target. This can be particularly useful if you’re cross-compiling some crates, and don’t want to specify your host’s machine as a target (for instance, an xtask in a shared project that may be worked on by many hosts).

•A path to a custom target specification. See Custom Target Lookup Path <https://doc.rust-lang.org/rustc/targets/custom.html#custom-target-lookup-path> for more information.

This may also be specified with the build.target config value <https://doc.rust-lang.org/cargo/reference/config.html>.

Note that specifying this flag makes Cargo run in a different mode where the target artifacts are placed in a separate directory. See the build cache <https://doc.rust-lang.org/cargo/reference/build-cache.html> documentation for more details.

-r, --release

Document optimized artifacts with the release profile. See also the --profile option for choosing a specific profile by name.

--profile name

Document with the given profile. See the reference <https://doc.rust-lang.org/cargo/reference/profiles.html> for more details on profiles.

--timings

Output information how long each compilation takes, and track concurrency information over time.

A file cargo-timing.html will be written to the target/cargo-timings directory at the end of the build. An additional report with a timestamp in its filename is also written if you want to look at a previous run. These reports are suitable for human consumption only, and do not provide machine-readable timing data.

Output Options

--target-dir directory

Directory for all generated artifacts and intermediate files. May also be specified with the CARGO_TARGET_DIR environment variable, or the build.target-dir config value <https://doc.rust-lang.org/cargo/reference/config.html>. Defaults to target in the root of the workspace.

Display Options

-v, --verbose

Use verbose output. May be specified twice for “very verbose” output which includes extra output such as dependency warnings and build script output. May also be specified with the term.verbose config value <https://doc.rust-lang.org/cargo/reference/config.html>.

-q, --quiet

Do not print cargo log messages. May also be specified with the term.quiet config value <https://doc.rust-lang.org/cargo/reference/config.html>.

--color when

Control when colored output is used. Valid values:

•auto (default): Automatically detect if color support is available on the terminal.

•always: Always display colors.

•never: Never display colors.

May also be specified with the term.color config value <https://doc.rust-lang.org/cargo/reference/config.html>.

--message-format fmt

The output format for diagnostic messages. Can be specified multiple times and consists of comma-separated values. Valid values:

•human (default): Display in a human-readable text format. Conflicts with short and json.

•short: Emit shorter, human-readable text messages. Conflicts with human and json.

•json: Emit JSON messages to stdout. See the reference <https://doc.rust-lang.org/cargo/reference/external-tools.html#json-messages> for more details. Conflicts with human and short.

•json-diagnostic-short: Ensure the rendered field of JSON messages contains the “short” rendering from rustc. Cannot be used with human or short.

•json-diagnostic-rendered-ansi: Ensure the rendered field of JSON messages contains embedded ANSI color codes for respecting rustc’s default color scheme. Cannot be used with human or short.

•json-render-diagnostics: Instruct Cargo to not include rustc diagnostics in JSON messages printed, but instead Cargo itself should render the JSON diagnostics coming from rustc. Cargo’s own JSON diagnostics and others coming from rustc are still emitted. Cannot be used with human or short.

Manifest Options

--manifest-path path

Path to the Cargo.toml file. By default, Cargo searches for the Cargo.toml file in the current directory or any parent directory.

--ignore-rust-version

Ignore rust-version specification in packages.

--locked

Asserts that the exact same dependencies and versions are used as when the existing Cargo.lock file was originally generated. Cargo will exit with an error when either of the following scenarios arises:

•The lock file is missing.

•Cargo attempted to change the lock file due to a different dependency resolution.

It may be used in environments where deterministic builds are desired, such as in CI pipelines.

--offline

Prevents Cargo from accessing the network for any reason. Without this flag, Cargo will stop with an error if it needs to access the network and the network is not available. With this flag, Cargo will attempt to proceed without the network if possible.

Beware that this may result in different dependency resolution than online mode. Cargo will restrict itself to crates that are downloaded locally, even if there might be a newer version as indicated in the local copy of the index. See the cargo-fetch(1) command to download dependencies before going offline.

May also be specified with the net.offline config value <https://doc.rust-lang.org/cargo/reference/config.html>.

--frozen

Equivalent to specifying both --locked and --offline.

Common Options

+toolchain

If Cargo has been installed with rustup, and the first argument to cargo begins with +, it will be interpreted as a rustup toolchain name (such as +stable or +nightly). See the rustup documentation <https://rust-lang.github.io/rustup/overrides.html> for more information about how toolchain overrides work.

--config KEY=VALUE or PATH

Overrides a Cargo configuration value. The argument should be in TOML syntax of KEY=VALUE, or provided as a path to an extra configuration file. This flag may be specified multiple times. See the command-line overrides section <https://doc.rust-lang.org/cargo/reference/config.html#command-line-overrides> for more information.

-C PATH

Changes the current working directory before executing any specified operations. This affects things like where cargo looks by default for the project manifest (Cargo.toml), as well as the directories searched for discovering .cargo/config.toml, for example. This option must appear before the command name, for example cargo -C path/to/my-project build.

This option is only available on the nightly channel <https://doc.rust-lang.org/book/appendix-07-nightly-rust.html> and requires the -Z unstable-options flag to enable (see #10098 <https://github.com/rust-lang/cargo/issues/10098>).

-h, --help

Prints help information.

-Z flag

Unstable (nightly-only) flags to Cargo. Run cargo -Z help for details.

Miscellaneous Options

-j N, --jobs N

Number of parallel jobs to run. May also be specified with the build.jobs config value <https://doc.rust-lang.org/cargo/reference/config.html>. Defaults to the number of logical CPUs. If negative, it sets the maximum number of parallel jobs to the number of logical CPUs plus provided value. If a string default is provided, it sets the value back to defaults. Should not be 0.

--keep-going

Build as many crates in the dependency graph as possible, rather than aborting the build on the first one that fails to build.

For example if the current package depends on dependencies fails and works, one of which fails to build, cargo doc -j1 may or may not build the one that succeeds (depending on which one of the two builds Cargo picked to run first), whereas cargo doc -j1 --keep-going would definitely run both builds, even if the one run first fails.

--output-format

The output type for the documentation emitted. Valid values:

•html (default): Emit the documentation in HTML format.

•json: Emit the documentation in the experimental JSON format <https://doc.rust-lang.org/nightly/nightly-rustc/rustdoc_json_types>.

This option is only available on the nightly channel <https://doc.rust-lang.org/book/appendix-07-nightly-rust.html> and requires the -Z unstable-options flag to enable.

ENVIRONMENT

See the reference <https://doc.rust-lang.org/cargo/reference/environment-variables.html> for details on environment variables that Cargo reads.

EXIT STATUS

•0: Cargo succeeded.

•101: Cargo failed to complete.

EXAMPLES

1.Build the local package documentation and its dependencies and output to target/doc. 

cargo doc

SEE ALSO

cargo(1), cargo-rustdoc(1), rustdoc(1)