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cargo-rustc(1)                                                  cargo-rustc(1)




NAME

       cargo-rustc - Compile the current package, and pass extra options to
       the compiler


SYNOPSIS

       cargo rustc [options] [-- args]


DESCRIPTION

       The specified target for the current package (or package specified by
       -p if provided) will be compiled along with all of its dependencies.
       The specified args will all be passed to the final compiler invocation,
       not any of the dependencies. Note that the compiler will still
       unconditionally receive arguments such as -L, --extern, and
       --crate-type, and the specified args will simply be added to the
       compiler invocation.

       See https://doc.rust-lang.org/rustc/index.html for documentation on
       rustc flags.

       This command requires that only one target is being compiled when
       additional arguments are provided. If more than one target is available
       for the current package the filters of --lib, --bin, etc, must be used
       to select which target is compiled.

       To pass flags to all compiler processes spawned by Cargo, use the
       RUSTFLAGS environment variable
       <https://doc.rust-lang.org/cargo/reference/environment-variables.html>
       or the build.rustflags config value
       <https://doc.rust-lang.org/cargo/reference/config.html>.


OPTIONS

   Package Selection
       By default, the package in the current working directory is selected.
       The -p flag can be used to choose a different package in a workspace.

       -p spec, --package spec
           The package to build. See cargo-pkgid(1) for the SPEC format.

   Target Selection
       When no target selection options are given, cargo rustc will build all
       binary and library targets of the selected package.

       Passing target selection flags will build only the specified targets.

       Note that --bin, --example, --test and --bench flags also support
       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 glob pattern.

       --lib
           Build the package's library.

       --bin name...
           Build the specified binary. This flag may be specified multiple
           times and supports common Unix glob patterns.

       --bins
           Build all binary targets.

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

       --examples
           Build all example targets.

       --test name...
           Build the specified integration test. This flag may be specified
           multiple times and supports common Unix glob patterns.

       --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 and supports common Unix glob patterns.

       --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
       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.

       --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
           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 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
        rustchttps://doc.rust-lang.org/cargo/reference/config.html   <https://doc.rust-lang.org/cargo/guide/build-cache.html>
           documentation for more details.

       --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 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
           No output printed to stdout.

       --color when
           Control when colored output is used. Valid values:

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

           o  always: Always display colors.

           o  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:

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

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

           o  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.

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

           o  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.

           o  json-render-diagnostics: Instruct Cargo to not include rustc
               diagnostics in 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.

       --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.

       --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>.

   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.

       -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 CPUs.


PROFILES

       Profiles may be used to configure compiler options such as optimization
       levels and debug settings. See the reference
       <https://doc.rust-lang.org/cargo/reference/profiles.html> 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 | test            | bench             |
       |target in "test" or |                 |                   |
       |"bench" mode        |                 |                   |
       +--------------------+-----------------+-------------------+

       Dependencies use the dev/release profiles.


ENVIRONMENT

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


EXIT STATUS

       o  0: Cargo succeeded.

       o  101: Cargo failed to complete.


EXAMPLES

        1. Check if your package (not including dependencies) uses unsafe
           code:

               cargo rustc --lib -- -D unsafe-code

        2. Try an experimental flag on the nightly compiler, such as this
           which prints the size of every type:

               cargo rustc --lib -- -Z print-type-sizes


SEE ALSO

       cargo(1), cargo-build(1), rustc(1)



                                                                cargo-rustc(1)

cargo 0.53.0 - Generated Fri May 7 10:53:57 CDT 2021
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