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| CARGO-RUSTC(1) |
FreeBSD General Commands Manual |
CARGO-RUSTC(1) |
cargo-rustc - Compile the current package, and pass extra options to the
compiler
cargo rustc [options] [-- args]
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>.
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.
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.
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.
--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
<https://doc.rust-lang.org/cargo/guide/build-cache.html> documentation
for more details.
-r, --release
Build optimized artifacts with the release
profile. See also the --profile option for choosing a specific profile
by name.
--profile name
Build with the given profile.
The rustc subcommand will treat the following named
profiles with special behaviors:
•check — Builds in the same way as
the cargo-check(1) command with the dev profile.
•test — Builds in the same way as
the cargo-test(1) command, enabling building in test mode which will
enable tests and enable the test cfg option. See rustc
tests <https://doc.rust-lang.org/rustc/tests/index.html> for more
detail.
•bench — Builds in the same was as
the cargo-bench(1) command, similar to the test profile.
See the the reference
<https://doc.rust-lang.org/cargo/reference/profiles.html> for more
details on profiles.
--ignore-rust-version
Build the target even if the selected Rust compiler is
older than the required Rust version as configured in the project's
rust-version field.
--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.
-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 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.
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>.
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.
-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.
--future-incompat-report
Displays a future-incompat report for any
future-incompatible warnings produced during execution of this command
See cargo-report(1)
•0: Cargo succeeded.
•101: Cargo failed to complete.
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
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