交叉编译（Cross Compiler）
第一层平台：
| Target | std | rustc | cargo | notes | ||
|---|---|---|---|---|---|---|
| i686-apple-darwin | ✓ | ✓ | ✓ | 32-bit OSX (10.7+, Lion+) | ||
| i686-pc-windows-gnu | ✓ | ✓ | ✓ | 32-bit MinGW (Windows 7+) | ||
| i686-pc-windows-msvc | ✓ | ✓ | ✓ | 32-bit MSVC (Windows 7+) | ||
| i686-unknown-linux-gnu | ✓ | ✓ | ✓ | 32-bit Linux (2.6.18+) | ||
| x86_64-apple-darwin | ✓ | ✓ | ✓ | 64-bit OSX (10.7+, Lion+) | ||
| x86_64-pc-windows-gnu | ✓ | ✓ | ✓ | 64-bit MinGW (Windows 7+) | ||
| x86_64-pc-windows-msvc | ✓ | ✓ | ✓ | 64-bit MSVC (Windows 7+) | ||
| x86_64-unknown-linux-gnu | ✓ | ✓ | ✓ | 64-bit Linux (2.6.18+) |
添加目标平台-工具链（toolchain） ＝ 标准库
例：添加 32-bit Linux (2.6.18+)
$ rustup target add i686-unknown-linux-gnu
添加目标平台-编译器（compiler）
添加目标平台-链接器（linker ）
[target.armv7-unknown-linux-gnueabihf]
linker = "arm-linux-gnueabihf-gcc-4.7"
查看目标平台
$ rustup target list
交叉编译工具链
linux
编译到目标平台
$ cargo build --target=i686-unknown-linux-gnu