README.md - third_party/rust - Git at Google

 # The Rust Programming Language

 This is the main source code repository for [Rust]. It contains the compiler, standard library,
 and documentation.

 [Rust]: https://www.rust-lang.org

 ## Quick Start

 Read ["Installing Rust"] from [The Book].

 ["Installing Rust"]: https://doc.rust-lang.org/book/getting-started.html#installing-rust
 [The Book]: https://doc.rust-lang.org/book/index.html

 ## Building from Source

 1. Make sure you have installed the dependencies:

    * `g++` 4.7 or later or `clang++` 3.x
    * `python` 2.7 (but not 3.x)
    * GNU `make` 3.81 or later
    * `cmake` 2.8.8 or later
    * `curl`
    * `git`

 2. Clone the [source] with `git`:

    ```sh
    $ git clone https://github.com/rust-lang/rust.git
    $ cd rust
    ```

 [source]: https://github.com/rust-lang/rust

 3. Build and install:

     ```sh
     $ ./configure
     $ make && make install
     ```

     > ***Note:*** You may need to use `sudo make install` if you do not
     > normally have permission to modify the destination directory. The
     > install locations can be adjusted by passing a `--prefix` argument
     > to `configure`. Various other options are also supported – pass
     > `--help` for more information on them.

     When complete, `make install` will place several programs into
     `/usr/local/bin`: `rustc`, the Rust compiler, and `rustdoc`, the
     API-documentation tool. This install does not include [Cargo],
     Rust's package manager, which you may also want to build.

 [Cargo]: https://github.com/rust-lang/cargo

 ### Building on Windows

 There are two prominent ABIs in use on Windows: the native (MSVC) ABI used by
 Visual Studio, and the GNU ABI used by the GCC toolchain. Which version of Rust
 you need depends largely on what C/C++ libraries you want to interoperate with:
 for interop with software produced by Visual Studio use the MSVC build of Rust;
 for interop with GNU software built using the MinGW/MSYS2 toolchain use the GNU
 build.


 #### MinGW

 [MSYS2](http://msys2.github.io/) can be used to easily build Rust on Windows:

 1. Grab the latest MSYS2 installer and go through the installer.

 2. From the MSYS2 terminal, install the `mingw64` toolchain and other required
    tools.

    ```sh
    # Update package mirrors (may be needed if you have a fresh install of MSYS2)
    $ pacman -Sy pacman-mirrors
    ```

    Download [MinGW from
    here](http://mingw-w64.org/doku.php/download/mingw-builds), and choose the
    `version=4.9.x,threads=win32,exceptions=dwarf/seh` flavor when installing. Also, make sure to install to a path without spaces in it. After installing,
    add its `bin` directory to your `PATH`. This is due to [#28260](https://github.com/rust-lang/rust/issues/28260), in the future,
    installing from pacman should be just fine.

    ```sh
    # Make git available in MSYS2 (if not already available on path)
    $ pacman -S git

    $ pacman -S base-devel
    ```

 3. Run `mingw32_shell.bat` or `mingw64_shell.bat` from wherever you installed
    MSYS2 (i.e. `C:\msys`), depending on whether you want 32-bit or 64-bit Rust.
    (As of the latest version of MSYS2 you have to run `msys2_shell.cmd -mingw32`
    or `msys2_shell.cmd -mingw64` from the command line instead)

 4. Navigate to Rust's source code, configure and build it:

    ```sh
    $ ./configure
    $ make && make install
    ```

 #### MSVC

 MSVC builds of Rust additionally require an installation of Visual Studio 2013
 (or later) so `rustc` can use its linker. Make sure to check the “C++ tools”
 option. In addition, `cmake` needs to be installed to build LLVM.

 With these dependencies installed, the build takes two steps:

 ```sh
 $ ./configure
 $ make && make install
 ```

 ## Building Documentation

 If you’d like to build the documentation, it’s almost the same:

 ```sh
 ./configure
 $ make docs
 ```

 Building the documentation requires building the compiler, so the above
 details will apply. Once you have the compiler built, you can

 ```sh
 $ make docs NO_REBUILD=1
 ```

 To make sure you don’t re-build the compiler because you made a change
 to some documentation.

 The generated documentation will appear in a top-level `doc` directory,
 created by the `make` rule.

 ## Notes

 Since the Rust compiler is written in Rust, it must be built by a
 precompiled "snapshot" version of itself (made in an earlier state of
 development). As such, source builds require a connection to the Internet, to
 fetch snapshots, and an OS that can execute the available snapshot binaries.

 Snapshot binaries are currently built and tested on several platforms:

 | Platform \ Architecture        | x86 | x86_64 |
 |--------------------------------|-----|--------|
 | Windows (7, 8, Server 2008 R2) | ✓   | ✓      |
 | Linux (2.6.18 or later)        | ✓   | ✓      |
 | OSX (10.7 Lion or later)       | ✓   | ✓      |

 You may find that other platforms work, but these are our officially
 supported build environments that are most likely to work.

 Rust currently needs between 600MiB and 1.5GiB to build, depending on platform. If it hits
 swap, it will take a very long time to build.

 There is more advice about hacking on Rust in [CONTRIBUTING.md].

 [CONTRIBUTING.md]: https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md

 ## Getting Help

 The Rust community congregates in a few places:

 * [Stack Overflow] - Direct questions about using the language.
 * [users.rust-lang.org] - General discussion and broader questions.
 * [/r/rust] - News and general discussion.

 [Stack Overflow]: http://stackoverflow.com/questions/tagged/rust
 [/r/rust]: http://reddit.com/r/rust
 [users.rust-lang.org]: https://users.rust-lang.org/

 ## Contributing

 To contribute to Rust, please see [CONTRIBUTING](CONTRIBUTING.md).

 Rust has an [IRC] culture and most real-time collaboration happens in a
 variety of channels on Mozilla's IRC network, irc.mozilla.org. The
 most popular channel is [#rust], a venue for general discussion about
 Rust. And a good place to ask for help would be [#rust-beginners].

 [IRC]: https://en.wikipedia.org/wiki/Internet_Relay_Chat
 [#rust]: irc://irc.mozilla.org/rust
 [#rust-beginners]: irc://irc.mozilla.org/rust-beginners

 ## License

 Rust is primarily distributed under the terms of both the MIT license
 and the Apache License (Version 2.0), with portions covered by various
 BSD-like licenses.

 See [LICENSE-APACHE](LICENSE-APACHE), [LICENSE-MIT](LICENSE-MIT), and [COPYRIGHT](COPYRIGHT) for details.
	# The Rust Programming Language

	This is the main source code repository for [Rust]. It contains the compiler, standard library,
	and documentation.

	[Rust]: https://www.rust-lang.org

	## Quick Start

	Read ["Installing Rust"] from [The Book].

	["Installing Rust"]: https://doc.rust-lang.org/book/getting-started.html#installing-rust
	[The Book]: https://doc.rust-lang.org/book/index.html

	## Building from Source

	1. Make sure you have installed the dependencies:

	* `g++` 4.7 or later or `clang++` 3.x
	* `python` 2.7 (but not 3.x)
	* GNU `make` 3.81 or later
	* `cmake` 2.8.8 or later
	* `curl`
	* `git`

	2. Clone the [source] with `git`:

	```sh
	$ git clone https://github.com/rust-lang/rust.git
	$ cd rust
	```

	[source]: https://github.com/rust-lang/rust

	3. Build and install:

	```sh
	$ ./configure
	$ make && make install
	```

	> *Note:* You may need to use `sudo make install` if you do not
	> normally have permission to modify the destination directory. The
	> install locations can be adjusted by passing a `--prefix` argument
	> to `configure`. Various other options are also supported – pass
	> `--help` for more information on them.

	When complete, `make install` will place several programs into
	`/usr/local/bin`: `rustc`, the Rust compiler, and `rustdoc`, the
	API-documentation tool. This install does not include [Cargo],
	Rust's package manager, which you may also want to build.

	[Cargo]: https://github.com/rust-lang/cargo

	### Building on Windows

	There are two prominent ABIs in use on Windows: the native (MSVC) ABI used by
	Visual Studio, and the GNU ABI used by the GCC toolchain. Which version of Rust
	you need depends largely on what C/C++ libraries you want to interoperate with:
	for interop with software produced by Visual Studio use the MSVC build of Rust;
	for interop with GNU software built using the MinGW/MSYS2 toolchain use the GNU
	build.


	#### MinGW

	[MSYS2](http://msys2.github.io/) can be used to easily build Rust on Windows:

	1. Grab the latest MSYS2 installer and go through the installer.

	2. From the MSYS2 terminal, install the `mingw64` toolchain and other required
	tools.

	```sh
	# Update package mirrors (may be needed if you have a fresh install of MSYS2)
	$ pacman -Sy pacman-mirrors
	```

	Download [MinGW from
	here](http://mingw-w64.org/doku.php/download/mingw-builds), and choose the
	`version=4.9.x,threads=win32,exceptions=dwarf/seh` flavor when installing. Also, make sure to install to a path without spaces in it. After installing,
	add its `bin` directory to your `PATH`. This is due to [#28260](https://github.com/rust-lang/rust/issues/28260), in the future,
	installing from pacman should be just fine.

	```sh
	# Make git available in MSYS2 (if not already available on path)
	$ pacman -S git

	$ pacman -S base-devel
	```

	3. Run `mingw32_shell.bat` or `mingw64_shell.bat` from wherever you installed
	MSYS2 (i.e. `C:\msys`), depending on whether you want 32-bit or 64-bit Rust.
	(As of the latest version of MSYS2 you have to run `msys2_shell.cmd -mingw32`
	or `msys2_shell.cmd -mingw64` from the command line instead)

	4. Navigate to Rust's source code, configure and build it:

	```sh
	$ ./configure
	$ make && make install
	```

	#### MSVC

	MSVC builds of Rust additionally require an installation of Visual Studio 2013
	(or later) so `rustc` can use its linker. Make sure to check the “C++ tools”
	option. In addition, `cmake` needs to be installed to build LLVM.

	With these dependencies installed, the build takes two steps:

	```sh
	$ ./configure
	$ make && make install
	```

	## Building Documentation

	If you’d like to build the documentation, it’s almost the same:

	```sh
	./configure
	$ make docs
	```

	Building the documentation requires building the compiler, so the above
	details will apply. Once you have the compiler built, you can

	```sh
	$ make docs NO_REBUILD=1
	```

	To make sure you don’t re-build the compiler because you made a change
	to some documentation.

	The generated documentation will appear in a top-level `doc` directory,
	created by the `make` rule.

	## Notes

	Since the Rust compiler is written in Rust, it must be built by a
	precompiled "snapshot" version of itself (made in an earlier state of
	development). As such, source builds require a connection to the Internet, to
	fetch snapshots, and an OS that can execute the available snapshot binaries.

	Snapshot binaries are currently built and tested on several platforms:

	\| Platform \ Architecture \| x86 \| x86_64 \|
	\|--------------------------------\|-----\|--------\|
	\| Windows (7, 8, Server 2008 R2) \| ✓ \| ✓ \|
	\| Linux (2.6.18 or later) \| ✓ \| ✓ \|
	\| OSX (10.7 Lion or later) \| ✓ \| ✓ \|

	You may find that other platforms work, but these are our officially
	supported build environments that are most likely to work.

	Rust currently needs between 600MiB and 1.5GiB to build, depending on platform. If it hits
	swap, it will take a very long time to build.

	There is more advice about hacking on Rust in [CONTRIBUTING.md].

	[CONTRIBUTING.md]: https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md

	## Getting Help

	The Rust community congregates in a few places:

	* [Stack Overflow] - Direct questions about using the language.
	* [users.rust-lang.org] - General discussion and broader questions.
	* [/r/rust] - News and general discussion.

	[Stack Overflow]: http://stackoverflow.com/questions/tagged/rust
	[/r/rust]: http://reddit.com/r/rust
	[users.rust-lang.org]: https://users.rust-lang.org/

	## Contributing

	To contribute to Rust, please see [CONTRIBUTING](CONTRIBUTING.md).

	Rust has an [IRC] culture and most real-time collaboration happens in a
	variety of channels on Mozilla's IRC network, irc.mozilla.org. The
	most popular channel is [#rust], a venue for general discussion about
	Rust. And a good place to ask for help would be [#rust-beginners].

	[IRC]: https://en.wikipedia.org/wiki/Internet_Relay_Chat
	[#rust]: irc://irc.mozilla.org/rust
	[#rust-beginners]: irc://irc.mozilla.org/rust-beginners

	## License

	Rust is primarily distributed under the terms of both the MIT license
	and the Apache License (Version 2.0), with portions covered by various
	BSD-like licenses.

	See [LICENSE-APACHE](LICENSE-APACHE), [LICENSE-MIT](LICENSE-MIT), and [COPYRIGHT](COPYRIGHT) for details.