CARGO-BUILD(1)

NAME
cargo-build - Compile the current package

SYNOPSIS

cargo build [OPTIONS]

DESCRIPTION

Compile local packages and all of their dependencies.

OPTIONS

  Package Selection

By default, when no package selection options are given, the packages selected depend on the current working directory. In the root of a virtual workspace, all workspace members are selected (--all is implied). Otherwise, only the package in the current directory will be selected. The default packages may be overridden with the workspace.default-members key in the root Cargo.toml manifest.

-p SPEC..., --package SPEC...
    Build only the specified packages. See cargo-pkgid(1) for the SPEC format. This flag may be specified multiple times.

--all
    Build all members in the workspace.

--exclude SPEC...
    Exclude the specified packages. Must be used in conjunction with the --all flag. This flag may be specified multiple times.

  Target Selection

When no target selection options are given, cargo build will build all binary and library targets of the selected packages. Binaries are skipped if they have required-features that are missing.

Passing target selection flags will build only the specified targets.

--lib
    Build the package’s library.

--bin NAME...
    Build the specified binary. This flag may be specified multiple times.

--bins
    Build all binary targets.

--example NAME...
    Build the specified example. This flag may be specified multiple times.

--examples
    Build all example targets.

--test NAME...
    Build the specified integration test. This flag may be specified multiple times.

--tests
    Build all targets in test mode that have the test = true manifest flag set. By default this includes the library and binaries built as unittests, and integration tests. Be aware that this will also build any required dependencies, so the lib target may be built twice (once as a unittest, and once as a dependency for binaries, integration tests, etc.). Targets may be enabled or disabled by setting the test flag in the manifest settings for the target.

--bench NAME...
    Build the specified benchmark. This flag may be specified multiple times.

--benches
    Build all targets in benchmark mode that have the bench = true manifest flag set. By default this includes the library and binaries built as benchmarks, and bench targets. Be aware that this will also build any required dependencies, so the lib target may be built twice (once as a benchmark, and once as a dependency for binaries, benchmarks, etc.). Targets may be enabled or disabled by setting the bench flag in the manifest settings for the target.

--all-targets
    Build all targets. This is equivalent to specifying --lib --bins --tests --benches --examples.

  Feature Selection

When no feature options are given, the default feature is activated for every selected package.

--features FEATURES
    Space or comma separated list of features to activate. These features only apply to the current directory’s package. Features of direct dependencies may be enabled with <dep-name>/<feature-name> syntax.

--all-features
    Activate all available features of all selected packages.

--no-default-features
    Do not activate the default feature of the current directory’s package.

  Compilation Options

--target TRIPLE
    Build for the given architecture. The default is the host architecture. The general format of the triple is <arch><sub>-<vendor>-<sys>-<abi>. Run rustc --print target-list for a list of supported targets.

    This may also be specified with the build.target

--release
    Build optimized artifacts with the release profile. See the PROFILES section for details on how this affects profile selection.

  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 Defaults to target in the root of the workspace.

--out-dir DIRECTORY
    Copy final artifacts to this directory.

    This option is unstable and available only on the and requires the -Z unstable-options flag to enable. See for more information.

  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

-q, --quiet
    No output printed to stdout.

--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

--message-format FMT
    The output format for diagnostic messages. Valid values:

        • human (default): Display in a human-readable text format.

        • json: Emit JSON messages to stdout.

        • short: Emit shorter, human-readable text messages.

--build-plan
    Outputs a series of JSON messages to stdout that indicate the commands to run the build.

    This option is unstable and available only on the and requires the -Z unstable-options flag to enable. See for more information.

  Manifest Options

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

--frozen, --locked
    Either of these flags requires that the Cargo.lock file is up-to-date. If the lock file is missing, or it needs to be updated, Cargo will exit with an error. The --frozen flag also prevents Cargo from attempting to access the network to determine if it is out-of-date.

    These may be used in environments where you want to assert that the Cargo.lock file is up-to-date (such as a CI build) or want to avoid network access.

  Common Options

-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 Defaults to the number of CPUs.

PROFILES

Profiles may be used to configure compiler options such as optimization levels and debug settings. See for more details.

Profile selection depends on the target and crate being built. By default the dev or test profiles are used. If the --release flag is given, then the release or bench profiles are used.
Target | Default Profile | --release Profile
lib, bin, example | dev | release
test, bench, or any target in "test" or "bench" mode | test | bench

Dependencies use the dev/release profiles.

ENVIRONMENT

See for details on environment variables that Cargo reads.

EXIT STATUS

0
    Cargo succeeded.

101
    Cargo failed to complete.

EXAMPLES

    1. Build the local package and all of its dependencies:

        cargo build

    2. Build with optimizations:

        cargo build --release

SEE ALSO

cargo(1), cargo-rustc(1)