This is the main source code repository for [Rust]. It contains the compiler, standard library, and documentation. [Rust]: https://www.rust-lang.org **Note: this README is for _users_ rather than _contributors_.** ## Quick Start Read ["Installation"] from [The Book]. ["Installation"]: https://doc.rust-lang.org/book/ch01-01-installation.html [The Book]: https://doc.rust-lang.org/book/index.html ## Installing from Source **Note: If you wish to _contribute_ to the compiler, you should read the [Getting Started][gettingstarted] of the rustc-dev-guide instead of this section.** The Rust build system uses a Python script called `x.py` to build the compiler, which manages the bootstrapping process. More information about it can be found by running `./x.py --help` or reading the [rustc dev guide][rustcguidebuild]. [gettingstarted]: https://rustc-dev-guide.rust-lang.org/getting-started.html [rustcguidebuild]: https://rustc-dev-guide.rust-lang.org/building/how-to-build-and-run.html ### Building on a Unix-like system 1. Make sure you have installed the dependencies: * `g++` 5.1 or later or `clang++` 3.5 or later * `python` 3 or 2.7 * GNU `make` 3.81 or later * `cmake` 3.4.3 or later * `ninja` * `curl` * `git` * `ssl` which comes in `libssl-dev` or `openssl-devel` * `pkg-config` if you are compiling on Linux and targeting Linux 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. Configure the build settings: The Rust build system uses a file named `config.toml` in the root of the source tree to determine various configuration settings for the build. Copy the default `config.toml.example` to `config.toml` to get started. ```sh $ cp config.toml.example config.toml ``` If you plan to use `x.py install` to create an installation, it is recommended that you set the `prefix` value in the `[install]` section to a directory. Create install directory if you are not installing in default directory 4. Build and install: ```sh $ ./x.py build && ./x.py install ``` When complete, `./x.py install` will place several programs into `$PREFIX/bin`: `rustc`, the Rust compiler, and `rustdoc`, the API-documentation tool. This install does not include [Cargo], Rust's package manager. To build and install Cargo, you may run `./x.py install cargo` or set the `build.extended` key in `config.toml` to `true` to build and install all tools. [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][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) 3. From this terminal, install the required tools: ```sh # Update package mirrors (may be needed if you have a fresh install of MSYS2) $ pacman -Sy pacman-mirrors # 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', 'cmake' and 'ninja' # 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-python \ mingw-w64-x86_64-cmake \ mingw-w64-x86_64-gcc \ mingw-w64-x86_64-ninja ``` 4. Navigate to Rust's source code (or clone it), then build it: ```sh $ ./x.py build && ./x.py install ``` #### MSVC MSVC builds of Rust additionally require an installation of Visual Studio 2017 (or later) so `rustc` can use its linker. The simplest way is to get the [Visual Studio], check the “C++ build tools” and “Windows 10 SDK” workload. [Visual Studio]: https://visualstudio.microsoft.com/downloads/ (If you're installing cmake yourself, be careful that “C++ CMake tools for Windows” doesn't get included under “Individual components”.) 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 and the build system doesn't understand, 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. ```batch > CALL "C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Auxiliary\Build\vcvars64.bat" > python x.py build ``` #### 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=` when invoking `x.py` commands, or by copying the `config.toml` file (as described in [Installing From Source](#installing-from-source)), and modifying the `build` option under the `[build]` section. ### 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 ``` 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 If you’d like to build the documentation, it’s 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 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 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, 10, ...) | ✓ | ✓ | | Linux (kernel 2.6.32, glibc 2.11 or later) | ✓ | ✓ | | macOS (10.7 Lion or later) | (\*) | ✓ | (\*): Apple dropped support for running 32-bit binaries starting from macOS 10.15 and iOS 11. Due to this decision from Apple, the targets are no longer useful to our users. Please read [our blog post][macx32] for more info. [macx32]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html You may find that other platforms work, but these are our officially supported build environments that are most likely to work. ## 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]: https://stackoverflow.com/questions/tagged/rust [/r/rust]: https://reddit.com/r/rust [users.rust-lang.org]: https://users.rust-lang.org/ ## Contributing If you are interested in contributing to the Rust project, please take a look at the [Getting Started][gettingstarted] guide in the [rustc-dev-guide]. ## 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. ## Trademark The Rust programming language is an open source, community project governed by a core team. It is also sponsored by the Mozilla Foundation (“Mozilla”), which owns and protects the Rust and Cargo trademarks and logos (the “Rust Trademarks”). If you want to use these names or brands, please read the [media guide][media-guide]. Third-party logos may be subject to third-party copyrights and trademarks. See [Licenses][policies-licenses] for details. [media-guide]: https://www.rust-lang.org/policies/media-guide [policies-licenses]: https://www.rust-lang.org/policies/licenses