# Platform Support

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Support for different platforms are organized into three tiers, each with a
different set of guarantees.

Platforms are identified by their "target triple" which is the string to
inform the compiler what kind of output should be produced. The columns in the
tables below have the following meanings:

* std:
    * ✓ indicates the full standard library is available.
    * \* indicates the target only supports [`no_std`] development.
    * ? indicates the standard library support is unknown or a work-in-progress.
* host: A ✓ indicates that `rustc` and `cargo` can run on the host platform.

[`no_std`]: https://rust-embedded.github.io/book/intro/no-std.html

## Tier 1

Tier 1 platforms can be thought of as "guaranteed to work".
Specifically they will each satisfy the following requirements:

* Official binary releases are provided for the platform.
* Automated testing is set up to run tests for the platform.
* Landing changes to the `rust-lang/rust` repository's master branch is gated
  on tests passing.
* Documentation for how to use and how to build the platform is available.

target | std | host | notes
-------|-----|------|-------
`aarch64-unknown-linux-gnu` | ✓ | ✓ | ARM64 Linux (kernel 4.2, glibc 2.17+) [^missing-stack-probes]
`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 (kernel 2.6.32+, glibc 2.11+)
`x86_64-apple-darwin` | ✓ | ✓ | 64-bit macOS (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 (kernel 2.6.32+, glibc 2.11+)

[^missing-stack-probes]: Stack probes support is missing on
  `aarch64-unknown-linux-gnu`, but it's planned to be implemented in the near
  future. The implementation is tracked on [issue #77071][77071].

[77071]: https://github.com/rust-lang/rust/issues/77071

## Tier 2

Tier 2 platforms can be thought of as "guaranteed to build". Automated tests
are not run so it's not guaranteed to produce a working build, but platforms
often work to quite a good degree and patches are always welcome!
Specifically, these platforms are required to have each of the following:

* Official binary releases are provided for the platform.
* Automated building is set up, but may not be running tests.
* Landing changes to the `rust-lang/rust` repository's master branch is gated on
    platforms **building**. For some platforms only the standard library is
    compiled, but for others `rustc` and `cargo` are too.

target | std | host | notes
-------|-----|------|-------
`aarch64-apple-darwin` | ✓ | ✓ | ARM64 macOS (11.0+, Big Sur+)
`aarch64-apple-ios` | ✓ |  | ARM64 iOS
`aarch64-fuchsia` | ✓ |  | ARM64 Fuchsia
`aarch64-linux-android` | ✓ |  | ARM64 Android
`aarch64-pc-windows-msvc` | ✓ | ✓ | ARM64 Windows MSVC
`aarch64-unknown-linux-musl` | ✓ | ✓ | ARM64 Linux with MUSL
`aarch64-unknown-none` | * |  | Bare ARM64, hardfloat
`aarch64-unknown-none-softfloat` | * |  | Bare ARM64, softfloat
`arm-linux-androideabi` | ✓ |  | ARMv7 Android
`arm-unknown-linux-gnueabi` | ✓ | ✓ | ARMv6 Linux (kernel 3.2, glibc 2.17)
`arm-unknown-linux-gnueabihf` | ✓ | ✓ | ARMv6 Linux, hardfloat (kernel 3.2, glibc 2.17)
`arm-unknown-linux-musleabi` | ✓ |  | ARMv6 Linux with MUSL
`arm-unknown-linux-musleabihf` | ✓ |  | ARMv6 Linux with MUSL, hardfloat
`armebv7r-none-eabi` | * |  | Bare ARMv7-R, Big Endian
`armebv7r-none-eabihf` | * |  | Bare ARMv7-R, Big Endian, hardfloat
`armv5te-unknown-linux-gnueabi` | ✓ |  | ARMv5TE Linux (kernel 4.4, glibc 2.23)
`armv5te-unknown-linux-musleabi` | ✓ |  | ARMv5TE Linux with MUSL
`armv7-linux-androideabi` | ✓ |  | ARMv7a Android
`armv7a-none-eabi` | * |  | Bare ARMv7-A
`armv7r-none-eabi` | * |  | Bare ARMv7-R
`armv7r-none-eabihf` | * |  | Bare ARMv7-R, hardfloat
`armv7-unknown-linux-gnueabi` | ✓ |   | ARMv7 Linux (kernel 4.15, glibc 2.27)
`armv7-unknown-linux-gnueabihf` | ✓ | ✓ | ARMv7 Linux, hardfloat (kernel 3.2, glibc 2.17)
`armv7-unknown-linux-musleabi` | ✓ |   | ARMv7 Linux, MUSL
`armv7-unknown-linux-musleabihf` | ✓ |  | ARMv7 Linux with MUSL
`asmjs-unknown-emscripten` | ✓ |  | asm.js via Emscripten
`i586-pc-windows-msvc` | ✓ |  | 32-bit Windows w/o SSE
`i586-unknown-linux-gnu` | ✓ |  | 32-bit Linux w/o SSE (kernel 4.4, glibc 2.23)
`i586-unknown-linux-musl` | ✓ |  | 32-bit Linux w/o SSE, MUSL
`i686-linux-android` | ✓ |  | 32-bit x86 Android
`i686-unknown-freebsd` | ✓ |  | 32-bit FreeBSD
`i686-unknown-linux-musl` | ✓ |  | 32-bit Linux with MUSL
`mips-unknown-linux-gnu` | ✓ | ✓ | MIPS Linux (kernel 4.4, glibc 2.23)
`mips-unknown-linux-musl` | ✓ |  | MIPS Linux with MUSL
`mips64-unknown-linux-gnuabi64` | ✓ | ✓ | MIPS64 Linux, n64 ABI (kernel 4.4, glibc 2.23)
`mips64-unknown-linux-muslabi64` | ✓ |  | MIPS64 Linux, n64 ABI, MUSL
`mips64el-unknown-linux-gnuabi64` | ✓ | ✓ | MIPS64 (LE) Linux, n64 ABI (kernel 4.4, glibc 2.23)
`mips64el-unknown-linux-muslabi64` | ✓ |  | MIPS64 (LE) Linux, n64 ABI, MUSL
`mipsel-unknown-linux-gnu` | ✓ | ✓ | MIPS (LE) Linux (kernel 4.4, glibc 2.23)
`mipsel-unknown-linux-musl` | ✓ |  | MIPS (LE) Linux with MUSL
`nvptx64-nvidia-cuda` | ✓ |  | --emit=asm generates PTX code that [runs on NVIDIA GPUs]
`powerpc-unknown-linux-gnu` | ✓ | ✓ | PowerPC Linux (kernel 2.6.32, glibc 2.11)
`powerpc64-unknown-linux-gnu` | ✓ | ✓ | PPC64 Linux (kernel 2.6.32, glibc 2.11)
`powerpc64le-unknown-linux-gnu` | ✓ | ✓ | PPC64LE Linux (kernel 3.10, glibc 2.17)
`riscv32i-unknown-none-elf` | * |  | Bare RISC-V (RV32I ISA)
`riscv32imac-unknown-none-elf` | * |  | Bare RISC-V (RV32IMAC ISA)
`riscv32imc-unknown-none-elf` | * |  | Bare RISC-V (RV32IMC ISA)
`riscv64gc-unknown-linux-gnu` | ✓ | ✓ | RISC-V Linux (kernel 4.20, glibc 2.29)
`riscv64gc-unknown-none-elf` | * |  | Bare RISC-V (RV64IMAFDC ISA)
`riscv64imac-unknown-none-elf` | * |  | Bare RISC-V (RV64IMAC ISA)
`s390x-unknown-linux-gnu` | ✓ | ✓ | S390x Linux (kernel 2.6.32, glibc 2.11)
`sparc64-unknown-linux-gnu` | ✓ |  | SPARC Linux (kernel 4.4, glibc 2.23)
`sparcv9-sun-solaris` | ✓ |  | SPARC Solaris 10/11, illumos
`thumbv6m-none-eabi` | * |  | Bare Cortex-M0, M0+, M1
`thumbv7em-none-eabi` | * |  | Bare Cortex-M4, M7
`thumbv7em-none-eabihf` | * |  | Bare Cortex-M4F, M7F, FPU, hardfloat
`thumbv7m-none-eabi` | * |  | Bare Cortex-M3
`thumbv7neon-linux-androideabi` | ✓ |  | Thumb2-mode ARMv7a Android with NEON
`thumbv7neon-unknown-linux-gnueabihf` | ✓ |  | Thumb2-mode ARMv7a Linux with NEON (kernel 4.4, glibc 2.23)
`thumbv8m.base-none-eabi` | * |  | ARMv8-M Baseline
`thumbv8m.main-none-eabi` | * |  | ARMv8-M Mainline
`thumbv8m.main-none-eabihf` | * |  | ARMv8-M Mainline, hardfloat
`wasm32-unknown-emscripten` | ✓ |  | WebAssembly via Emscripten
`wasm32-unknown-unknown` | ✓ |  | WebAssembly
`wasm32-wasi` | ✓ |  | WebAssembly with WASI
`x86_64-apple-ios` | ✓ |  | 64-bit x86 iOS
`x86_64-fortanix-unknown-sgx` | ✓ |  | [Fortanix ABI] for 64-bit Intel SGX
`x86_64-fuchsia` | ✓ |  | 64-bit Fuchsia
`x86_64-linux-android` | ✓ |  | 64-bit x86 Android
`x86_64-rumprun-netbsd` | ✓ |  | 64-bit NetBSD Rump Kernel
`x86_64-sun-solaris` | ✓ |  | 64-bit Solaris 10/11, illumos
`x86_64-unknown-freebsd` | ✓ | ✓ | 64-bit FreeBSD
`x86_64-unknown-illumos` | ✓ | ✓ | illumos
`x86_64-unknown-linux-gnux32` | ✓ |  | 64-bit Linux (x32 ABI) (kernel 4.15, glibc 2.27)
`x86_64-unknown-linux-musl` | ✓ | ✓ | 64-bit Linux with MUSL
`x86_64-unknown-netbsd` | ✓ | ✓ | NetBSD/amd64
`x86_64-unknown-redox` | ✓ |  | Redox OS

[Fortanix ABI]: https://edp.fortanix.com/

## Tier 3

Tier 3 platforms are those which the Rust codebase has support for, but which
are not built or tested automatically, and may not work. Official builds are
not available.

target | std | host | notes
-------|-----|------|-------
`aarch64-apple-ios-macabi` | ? |  | Apple Catalyst on ARM64
`aarch64-apple-tvos` | * |  | ARM64 tvOS
`aarch64-unknown-freebsd` | ✓ | ✓ | ARM64 FreeBSD
`aarch64-unknown-hermit` | ? |  |
`aarch64-unknown-netbsd` | ✓ | ✓ |
`aarch64-unknown-openbsd` | ✓ | ✓ | ARM64 OpenBSD
`aarch64-unknown-redox` | ? |  | ARM64 Redox OS
`aarch64-uwp-windows-msvc` | ? |  |
`aarch64-wrs-vxworks` | ? |  |
`armv4t-unknown-linux-gnueabi` | ? |  |
`armv5te-unknown-linux-uclibceabi` | ? |  | ARMv5TE Linux with uClibc
`armv6-unknown-freebsd` | ✓ | ✓ | ARMv6 FreeBSD
`armv6-unknown-netbsd-eabihf` | ? |  |
`armv7-apple-ios` | ✓ |  | ARMv7 iOS, Cortex-a8
`armv7-unknown-freebsd` | ✓ | ✓ | ARMv7 FreeBSD
`armv7-unknown-netbsd-eabihf` | ✓ | ✓ |
`armv7-wrs-vxworks-eabihf` | ? |  |
`armv7a-none-eabihf` | * | | ARM Cortex-A, hardfloat
`armv7s-apple-ios` | ✓ |  |
`avr-unknown-gnu-atmega328` | ✗ |  | AVR. Requires `-Z build-std=core`
`hexagon-unknown-linux-musl` | ? |  |
`i386-apple-ios` | ✓ |  | 32-bit x86 iOS
`i686-apple-darwin` | ✓ | ✓ | 32-bit macOS (10.7+, Lion+)
`i686-pc-windows-msvc` | ✓ |  | 32-bit Windows XP support
`i686-unknown-uefi` | ? |  | 32-bit UEFI
`i686-unknown-haiku` | ✓ | ✓ | 32-bit Haiku
`i686-unknown-netbsd` | ✓ | ✓ | NetBSD/i386 with SSE2
`i686-unknown-openbsd` | ✓ | ✓ | 32-bit OpenBSD
`i686-uwp-windows-gnu` | ? |  |
`i686-uwp-windows-msvc` | ? |  |
`i686-wrs-vxworks` | ? |  |
`mips-unknown-linux-uclibc` | ✓ |  | MIPS Linux with uClibc
`mipsel-unknown-linux-uclibc` | ✓ |  | MIPS (LE) Linux with uClibc
`mipsel-unknown-none` | * |  | Bare MIPS (LE) softfloat
`mipsel-sony-psp` | * |  | MIPS (LE) Sony PlayStation Portable (PSP)
`mipsisa32r6-unknown-linux-gnu` | ? |  |
`mipsisa32r6el-unknown-linux-gnu` | ? |  |
`mipsisa64r6-unknown-linux-gnuabi64` | ? |  |
`mipsisa64r6el-unknown-linux-gnuabi64` | ? |  |
`msp430-none-elf` | * |  | 16-bit MSP430 microcontrollers
`powerpc-unknown-linux-gnuspe` | ✓ |  | PowerPC SPE Linux
`powerpc-unknown-linux-musl` | ? |  |
`powerpc-unknown-netbsd` | ✓ | ✓ |
`powerpc-wrs-vxworks` | ? |  |
`powerpc-wrs-vxworks-spe` | ? |  |
`powerpc64-unknown-freebsd` | ✓ | ✓ | PPC64 FreeBSD (ELFv1 and ELFv2)
`powerpc64-unknown-linux-musl` | ? |  |
`powerpc64-wrs-vxworks` | ? |  |
`powerpc64le-unknown-linux-musl` | ? |  |
`riscv32gc-unknown-linux-gnu` |   |   | RISC-V Linux (kernel 5.4, glibc 2.33)
`sparc-unknown-linux-gnu` | ✓ |  | 32-bit SPARC Linux
`sparc64-unknown-netbsd` | ✓ | ✓ | NetBSD/sparc64
`sparc64-unknown-openbsd` | ? |  |
`thumbv7a-pc-windows-msvc` | ? |  |
`thumbv7a-uwp-windows-msvc` | ✓ |  |
`thumbv7neon-unknown-linux-musleabihf` | ? |  | Thumb2-mode ARMv7a Linux with NEON, MUSL
`thumbv4t-none-eabi` | * |  | ARMv4T T32
`x86_64-apple-ios-macabi` | ✓ |  | Apple Catalyst on x86_64
`x86_64-apple-tvos` | * | | x86 64-bit tvOS
`x86_64-linux-kernel` | * |  | Linux kernel modules
`x86_64-pc-solaris` | ? |  |
`x86_64-pc-windows-msvc` | ✓ |  | 64-bit Windows XP support
`x86_64-unknown-dragonfly` | ✓ | ✓ | 64-bit DragonFlyBSD
`x86_64-unknown-haiku` | ✓ | ✓ | 64-bit Haiku
`x86_64-unknown-hermit` | ? |  |
`x86_64-unknown-hermit-kernel` | ? |  | HermitCore kernel
`x86_64-unknown-l4re-uclibc` | ? |  |
`x86_64-unknown-openbsd` | ✓ | ✓ | 64-bit OpenBSD
`x86_64-unknown-uefi` | ? |  |
`x86_64-uwp-windows-gnu` | ✓ |  |
`x86_64-uwp-windows-msvc` | ✓ |  |
`x86_64-wrs-vxworks` | ? |  |

[runs on NVIDIA GPUs]: https://github.com/japaric-archived/nvptx#targets
