cargo-report-future-incompatibilities(1)

NAME

cargo-report-future-incompatibilities — Reports any crates which will eventually stop compiling

SYNOPSIS

cargo report future-incompatibilities [options]

DESCRIPTION

Displays a report of future-incompatible warnings that were emitted during previous builds. These are warnings for changes that may become hard errors in the future, causing dependencies to stop building in a future version of rustc.

For more, see the chapter on Future incompat report.

OPTIONS

--id id

Show the report with the specified Cargo-generated id. If not specified, shows the most recent report.

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 display a report for. See cargo-pkgid(1) for the SPEC format.

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.

-q
--quiet

Do not print cargo log messages. May also be specified with the term.quiet config value.

--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.

Manifest Options

--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.

--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 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 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 and requires the -Z unstable-options flag to enable (see #10098).

-h
--help

Prints help information.

-Z flag

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

ENVIRONMENT

See the reference for details on environment variables that Cargo reads.

EXIT STATUS

  • 0: Cargo succeeded.
  • 101: Cargo failed to complete.

EXAMPLES

  1. Display the latest future-incompat report:

    cargo report future-incompat

  2. Display the latest future-incompat report for a specific package:

    cargo report future-incompat --package my-dep@0.0.1

SEE ALSO

cargo(1), cargo-report(1), cargo-build(1)