rust/README.md

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# The Rust Programming Language
This is the main source code repository for [Rust]. It contains the compiler,
standard library, and documentation.
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[Rust]: https://www.rust-lang.org
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## Quick Start
[quick-start]: #quick-start
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Read ["Installation"] from [The Book].
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["Installation"]: https://doc.rust-lang.org/book/second-edition/ch01-01-installation.html
[The Book]: https://doc.rust-lang.org/book/index.html
## Building from Source
[building-from-source]: #building-from-source
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### Building on *nix
1. Make sure you have installed the dependencies:
* `g++` 4.7 or later or `clang++` 3.x or later
* `python` 2.7 (but not 3.x)
* GNU `make` 3.81 or later
* `cmake` 3.4.3 or later
* `curl`
* `git`
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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
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$ git submodule update --init --recursive --progress
$ ./x.py build && sudo ./x.py install
```
> ***Note:*** Install locations can be adjusted by copying the config file
> from `./config.toml.example` to `./config.toml`, and
> adjusting the `prefix` option under `[install]`. Various other options, such
> as enabling debug information, are also supported, and are documented in
> the config file.
When complete, `sudo ./x.py 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
[building-on-windows]: #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
[windows-mingw]: #windows-mingw
[MSYS2][msys2] can be used to easily build Rust on Windows:
[msys2]: https://msys2.github.io/
1. Grab the latest [MSYS2 installer][msys2] and go through the installer.
2. Run `mingw32_shell.bat` or `mingw64_shell.bat` from wherever you installed
MSYS2 (i.e. `C:\msys64`), 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)
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3. From this terminal, install the required tools:
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```sh
# Update package mirrors (may be needed if you have a fresh install of MSYS2)
$ pacman -Sy pacman-mirrors
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# Install build tools needed for Rust. If you're building a 32-bit compiler,
# then replace "x86_64" below with "i686". If you've already got git, python,
# or CMake installed and in PATH you can remove them from this list. Note
# that it is important that you do **not** use the 'python2' and 'cmake'
# packages from the 'msys2' subsystem. The build has historically been known
# to fail with these packages.
$ pacman -S git \
make \
diffutils \
tar \
mingw-w64-x86_64-python2 \
mingw-w64-x86_64-cmake \
mingw-w64-x86_64-gcc
```
4. Navigate to Rust's source code (or clone it), then build it:
```sh
$ ./x.py build && ./x.py install
```
#### MSVC
[windows-msvc]: #windows-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.
With these dependencies installed, you can build the compiler in a `cmd.exe`
shell with:
```sh
> python x.py build
```
Currently, building Rust only works with some known versions of Visual Studio. If
you have a more recent version installed the build system doesn't understand
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then you may need to force rustbuild to use an older version. This can be done
by manually calling the appropriate vcvars file before running the bootstrap.
```
CALL "C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\bin\amd64\vcvars64.bat"
rustbuild: Rewrite user-facing interface This commit is a rewrite of the user-facing interface to the rustbuild build system. The intention here is to make it much easier to compile/test the project without having to remember weird rule names and such. An overall view of the new interface is: # build everything ./x.py build # document everyting ./x.py doc # test everything ./x.py test # test libstd ./x.py test src/libstd # build libcore stage0 ./x.py build src/libcore --stage 0 # run stage1 run-pass tests ./x.py test src/test/run-pass --stage 1 The `src/bootstrap/bootstrap.py` script is now aliased as a top-level `x.py` script. This `x` was chosen to be both short and easily tab-completable (no collisions in that namespace!). The build system now accepts a "subcommand" of what to do next, the main ones being build/doc/test. Each subcommand then receives an optional list of arguments. These arguments are paths in the source repo of what to work with. That is, if you want to test a directory, you just pass that directory as an argument. The purpose of this rewrite is to do away with all of the arcane renames like "rpass" is the "run-pass" suite, "cfail" is the "compile-fail" suite, etc. By simply working with directories and files it's much more intuitive of how to run a test (just pass it as an argument). The rustbuild step/dependency management was also rewritten along the way to make this easy to work with and define, but that's largely just a refactoring of what was there before. The *intention* is that this support is extended for arbitrary files (e.g. `src/test/run-pass/my-test-case.rs`), but that isn't quite implemented just yet. Instead directories work for now but we can follow up with stricter path filtering logic to plumb through all the arguments.
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python x.py build
```
#### Specifying an ABI
[specifying-an-abi]: #specifying-an-abi
Each specific ABI can also be used from either environment (for example, using
the GNU ABI in PowerShell) by using an explicit build triple. The available
Windows build triples are:
- GNU ABI (using GCC)
- `i686-pc-windows-gnu`
- `x86_64-pc-windows-gnu`
- The MSVC ABI
- `i686-pc-windows-msvc`
- `x86_64-pc-windows-msvc`
The build triple can be specified by either specifying `--build=<triple>` when
invoking `x.py` commands, or by copying the `config.toml` file (as described
in Building From Source), and modifying the `build` option under the `[build]`
section.
### Configure and Make
[configure-and-make]: #configure-and-make
While it's not the recommended build system, this project also provides a
configure script and makefile (the latter of which just invokes `x.py`).
```sh
$ ./configure
$ make && sudo make install
```
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When using the configure script, the generated `config.mk` file may override the
`config.toml` file. To go back to the `config.toml` file, delete the generated
`config.mk` file.
## Building Documentation
[building-documentation]: #building-documentation
If youd like to build the documentation, its almost the same:
```sh
$ ./x.py doc
```
The generated documentation will appear under `doc` in the `build` directory for
the ABI used. I.e., if the ABI was `x86_64-pc-windows-msvc`, the directory will be
`build\x86_64-pc-windows-msvc\doc`.
## Notes
[notes]: #notes
Since the Rust compiler is written in Rust, it must be built by a
precompiled "snapshot" version of itself (made in an earlier stage of
development). As such, source builds require a connection to the Internet, to
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fetch snapshots, and an OS that can execute the available snapshot binaries.
Snapshot binaries are currently built and tested on several platforms:
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| Platform / Architecture | x86 | x86_64 |
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|--------------------------------|-----|--------|
| 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.
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Rust currently needs between 600MiB and 1.5GiB of RAM to build, depending on platform.
If it hits swap, it will take a very long time to build.
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There is more advice about hacking on Rust in [CONTRIBUTING.md].
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[CONTRIBUTING.md]: https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md
## Getting Help
[getting-help]: #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.
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* [/r/rust] - News and general discussion.
[Stack Overflow]: https://stackoverflow.com/questions/tagged/rust
[/r/rust]: https://reddit.com/r/rust
[users.rust-lang.org]: https://users.rust-lang.org/
## Contributing
[contributing]: #contributing
To contribute to Rust, please see [CONTRIBUTING](CONTRIBUTING.md).
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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].
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Also, the [rustc guide] might be a good place to start if you want to
find out how various parts of the compiler work.
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[IRC]: https://en.wikipedia.org/wiki/Internet_Relay_Chat
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[#rust]: irc://irc.mozilla.org/rust
[#rust-beginners]: irc://irc.mozilla.org/rust-beginners
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[rustc guide]: https://rust-lang-nursery.github.io/rustc-guide/about-this-guide.html
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## License
[license]: #license
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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.