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
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.
--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.
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. 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 current
directory’s package.
--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.
--release
Build optimized artifacts with the release
profile. See the PROFILES section for details on how this affects profile
selection.
--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
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 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.
•short: Emit shorter, human-readable text
messages.
•json: Emit JSON messages to stdout. See
the reference
<https://doc.rust-lang.org/cargo/reference/external-tools.html#json-messages>
for more details.
•json-diagnostic-short: Ensure the
rendered field of JSON messages contains the "short"
rendering from rustc.
•json-diagnostic-rendered-ansi: Ensure the
rendered field of JSON messages contains embedded ANSI color codes for
respecting rustc’s default color scheme.
•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.
--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>.
-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.
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 target in
"test" or "bench" mode |
test |
bench |
Dependencies use the dev/release profiles.
See the reference
<https://doc.rust-lang.org/cargo/reference/environment-variables.html>
for details on environment variables that Cargo reads.
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