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Latest commit 163de44 Feb 25, 2017 @bors bors Auto merge of #3742 - matklad:sets-are-monoid, r=alexcrichton
Simplify feature-handling code

A neat (imo :) ) hack to use an empty `&HashSet` instead of `Option<&HashSet>`.

Cargo downloads your Rust project’s dependencies and compiles your project.

Learn more at

Code Status

Build Status Build Status

Installing Cargo

Cargo is distributed by default with Rust, so if you've got rustc installed locally you probably also have cargo installed locally.

Compiling from Source

Cargo requires the following tools and packages to build:

  • python
  • curl (on Unix)
  • cmake
  • OpenSSL headers (only for Unix, this is the libssl-dev package on ubuntu)
  • cargo and rustc

First, you'll want to check out this repository

git clone --recursive
cd cargo

With cargo already installed, you can simply run:

cargo build --release

Otherwise, you can also use a more traditional approach:

make install

More options can be discovered through ./configure, such as compiling cargo for more than one target. For example, if you'd like to compile both 32 and 64 bit versions of cargo on unix you would use:

$ ./configure --target=i686-unknown-linux-gnu,x86_64-unknown-linux-gnu

Running the tests

To run cargo's tests, use cargo test. If you do not have the cross-compilers installed locally, ignore the cross-compile test failures, or disable them by using CFG_DISABLE_CROSS_TESTS=1 cargo test.

Adding new subcommands to Cargo

Cargo is designed to be extensible with new subcommands without having to modify Cargo itself. See the Wiki page for more details and a list of known community-developed subcommands.

Contributing to the Docs

To contribute to the docs, all you need to do is change the markdown files in the src/doc directory. To view the rendered version of changes you have made locally, run:

make doc
open target/doc/index.html


High level release notes are available as part of Rust's release notes. Cargo releases coincide with Rust releases.

Table of Rust versions with their Cargo versions

Rust version Cargo version
1.12.0 0.13.0
1.11.0 0.12.0
1.10.0 0.11.0
1.9.0 0.10.0
1.8.0 0.9.0
1.7.0 0.8.0
1.6.0 0.7.0
1.5.0 0.6.0
1.4.0 0.5.0
1.3.0 0.4.0
1.2.0 0.3.0
1.1.0 0.2.0
1.0.0 0.1.0

Reporting Issues

Found a bug? We'd love to know about it!

Please report all issues on the github issue tracker.


Cargo is primarily distributed under the terms of both the MIT license and the Apache License (Version 2.0).


Third party software

This product includes software developed by the OpenSSL Project for use in the OpenSSL Toolkit (

In binary form, this product includes software that is licensed under the terms of the GNU General Public License, version 2, with a linking exception, which can be obtained from the upstream repository.