# Platform Support

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Support for different platforms ("targets") are organized into three tiers,
each with a different set of guarantees. For more information on the policies
for targets at each tier, see the [Target Tier Policy](target-tier-policy.md).

Targets are identified by their "target triple" which is the string to inform
the compiler what kind of output should be produced.

## Tier 1 with Host Tools

Tier 1 targets can be thought of as "guaranteed to work". The Rust project
builds official binary releases for each tier 1 target, and automated testing
ensures that each tier 1 target builds and passes tests after each change.

Tier 1 targets with host tools additionally support running tools like `rustc`
and `cargo` natively on the target, and automated testing ensures that tests
pass for the host tools as well. This allows the target to be used as a
development platform, not just a compilation target. For the full requirements,
see [Tier 1 with Host Tools](target-tier-policy.md#tier-1-with-host-tools) in
the Target Tier Policy.

All tier 1 targets with host tools support the full standard library.

target | 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 1

Tier 1 targets can be thought of as "guaranteed to work". The Rust project
builds official binary releases for each tier 1 target, and automated testing
ensures that each tier 1 target builds and passes tests after each change. For
the full requirements, see [Tier 1 target
policy](target-tier-policy.md#tier-1-target-policy) in the Target Tier Policy.

At this time, all Tier 1 targets are [Tier 1 with Host
Tools](#tier-1-with-host-tools).

## Tier 2 with Host Tools

Tier 2 targets can be thought of as "guaranteed to build". The Rust project
builds official binary releases for each tier 2 target, and automated builds
ensure that each tier 2 target builds after each change. Automated tests are
not always run so it's not guaranteed to produce a working build, but tier 2
targets often work to quite a good degree and patches are always welcome!

Tier 2 targets with host tools additionally support running tools like `rustc`
and `cargo` natively on the target, and automated builds ensure that the host
tools build as well. This allows the target to be used as a development
platform, not just a compilation target. For the full requirements, see [Tier 2
with Host Tools](target-tier-policy.md#tier-2-with-host-tools) in the Target
Tier Policy.

All tier 2 targets with host tools support the full standard library.

**NOTE:** Tier 2 targets currently do not build the `rust-docs` component.

target | notes
-------|-------
`aarch64-apple-darwin` | ARM64 macOS (11.0+, Big Sur+)
`aarch64-pc-windows-msvc` | ARM64 Windows MSVC
`aarch64-unknown-linux-musl` | ARM64 Linux with MUSL
`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)
`armv7-unknown-linux-gnueabihf` | ARMv7 Linux, hardfloat (kernel 3.2, glibc 2.17)
`mips-unknown-linux-gnu` | MIPS Linux (kernel 4.4, glibc 2.23)
`mips64-unknown-linux-gnuabi64` | MIPS64 Linux, n64 ABI (kernel 4.4, glibc 2.23)
`mips64el-unknown-linux-gnuabi64` | MIPS64 (LE) Linux, n64 ABI (kernel 4.4, glibc 2.23)
`mipsel-unknown-linux-gnu` | MIPS (LE) Linux (kernel 4.4, glibc 2.23)
`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)
`riscv64gc-unknown-linux-gnu` | RISC-V Linux (kernel 4.20, glibc 2.29)
`s390x-unknown-linux-gnu` | S390x Linux (kernel 2.6.32, glibc 2.11)
`x86_64-unknown-freebsd` | 64-bit FreeBSD
`x86_64-unknown-illumos` | illumos
`x86_64-unknown-linux-musl` | 64-bit Linux with MUSL
`x86_64-unknown-netbsd` | NetBSD/amd64

## Tier 2

Tier 2 targets can be thought of as "guaranteed to build". The Rust project
builds official binary releases for each tier 2 target, and automated builds
ensure that each tier 2 target builds after each change. Automated tests are
not always run so it's not guaranteed to produce a working build, but tier 2
targets often work to quite a good degree and patches are always welcome! For
the full requirements, see [Tier 2 target
policy](target-tier-policy.md#tier-2-target-policy) in the Target Tier Policy.

The `std` column in the table below has the following meanings:

* ✓ indicates the full standard library is available.
* \* indicates the target only supports [`no_std`] development.

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

**NOTE:** Tier 2 targets currently do not build the `rust-docs` component.

target | std | notes
-------|:---:|-------
`aarch64-apple-ios` | ✓ | ARM64 iOS
[`aarch64-apple-ios-sim`](platform-support/aarch64-apple-ios-sim.md) | ✓ | Apple iOS Simulator on ARM64
`aarch64-fuchsia` | ✓ | ARM64 Fuchsia
`aarch64-linux-android` | ✓ | ARM64 Android
`aarch64-unknown-none-softfloat` | * | Bare ARM64, softfloat
`aarch64-unknown-none` | * | Bare ARM64, hardfloat
`arm-linux-androideabi` | ✓ | ARMv7 Android
`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
`armv7-unknown-linux-gnueabi` | ✓ |ARMv7 Linux (kernel 4.15, glibc 2.27)
`armv7-unknown-linux-musleabi` | ✓ |ARMv7 Linux, MUSL
`armv7-unknown-linux-musleabihf` | ✓ | ARMv7 Linux with MUSL
`armv7a-none-eabi` | * | Bare ARMv7-A
`armv7r-none-eabi` | * | Bare ARMv7-R
`armv7r-none-eabihf` | * | Bare ARMv7-R, hardfloat
`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-musl` | ✓ | MIPS Linux with MUSL
`mips64-unknown-linux-muslabi64` | ✓ | MIPS64 Linux, n64 ABI, MUSL
`mips64el-unknown-linux-muslabi64` | ✓ | MIPS64 (LE) Linux, n64 ABI, MUSL
`mipsel-unknown-linux-musl` | ✓ | MIPS (LE) Linux with MUSL
`nvptx64-nvidia-cuda` | * | --emit=asm generates PTX code that [runs on NVIDIA GPUs]
`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-none-elf` | * | Bare RISC-V (RV64IMAFDC ISA)
`riscv64imac-unknown-none-elf` | * | Bare RISC-V (RV64IMAC ISA)
`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-pc-solaris` | ✓ | 64-bit Solaris 10/11, illumos
`x86_64-unknown-linux-gnux32` | ✓ | 64-bit Linux (x32 ABI) (kernel 4.15, glibc 2.27)
`x86_64-unknown-redox` | ✓ | Redox OS

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

## Tier 3

Tier 3 targets are those which the Rust codebase has support for, but which the
Rust project does not build or test automatically, so they may or may not work.
Official builds are not available. For the full requirements, see [Tier 3
target policy](target-tier-policy.md#tier-3-target-policy) in the Target Tier
Policy.

The `std` column in the table below has the following meanings:

* ✓ 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.

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

The `host` column indicates whether the codebase includes support for building
host tools.

target | std | host | notes
-------|:---:|:----:|-------
`aarch64-apple-ios-macabi` | ? |  | Apple Catalyst on ARM64
`aarch64-apple-tvos` | * |  | ARM64 tvOS
[`aarch64-kmc-solid_asp3`](platform-support/kmc-solid.md) | ✓ |  | ARM64 SOLID with TOPPERS/ASP3
`aarch64-unknown-freebsd` | ✓ | ✓ | ARM64 FreeBSD
`aarch64-unknown-hermit` | ? |  |
`aarch64-unknown-uefi` | * |  | ARM64 UEFI
`aarch64-unknown-linux-gnu_ilp32` | ✓ | ✓ | ARM64 Linux (ILP32 ABI)
`aarch64-unknown-netbsd` | ✓ | ✓ |
`aarch64-unknown-openbsd` | ✓ | ✓ | ARM64 OpenBSD
`aarch64-unknown-redox` | ? |  | ARM64 Redox OS
`aarch64-uwp-windows-msvc` | ? |  |
`aarch64-wrs-vxworks` | ? |  |
`aarch64_be-unknown-linux-gnu_ilp32` | ✓ | ✓ | ARM64 Linux (big-endian, ILP32 ABI)
`aarch64_be-unknown-linux-gnu` | ✓ | ✓ | ARM64 Linux (big-endian)
`armv4t-unknown-linux-gnueabi` | ? |  |
`armv5te-unknown-linux-uclibceabi` | ? |  | ARMv5TE Linux with uClibc
`armv6-unknown-freebsd` | ✓ | ✓ | ARMv6 FreeBSD
`armv6-unknown-netbsd-eabihf` | ? |  |
`armv6k-nintendo-3ds` | * |  | ARMv6K Nintendo 3DS, Horizon (Requires devkitARM toolchain)
`armv7-apple-ios` | ✓ |  | ARMv7 iOS, Cortex-a8
`armv7-unknown-freebsd` | ✓ | ✓ | ARMv7 FreeBSD
`armv7-unknown-netbsd-eabihf` | ✓ | ✓ |
`armv7-wrs-vxworks-eabihf` | ? |  |
[`armv7a-kmc-solid_asp3-eabi`](platform-support/kmc-solid.md) | ✓ |  | ARM SOLID with TOPPERS/ASP3
[`armv7a-kmc-solid_asp3-eabihf`](platform-support/kmc-solid.md) | ✓ |  | ARM SOLID with TOPPERS/ASP3, hardfloat
`armv7a-none-eabihf` | * | | ARM Cortex-A, hardfloat
`armv7s-apple-ios` | ✓ |  |
`avr-unknown-gnu-atmega328` | * |  | AVR. Requires `-Z build-std=core`
`bpfeb-unknown-none` | * |  | BPF (big endian)
`bpfel-unknown-none` | * |  | BPF (little endian)
`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-haiku` | ✓ | ✓ | 32-bit Haiku
`i686-unknown-netbsd` | ✓ | ✓ | NetBSD/i386 with SSE2
`i686-unknown-openbsd` | ✓ | ✓ | 32-bit OpenBSD
`i686-unknown-uefi` | * |  | 32-bit UEFI
`i686-uwp-windows-gnu` | ? |  |
`i686-uwp-windows-msvc` | ? |  |
`i686-wrs-vxworks` | ? |  |
`m68k-unknown-linux-gnu` | ? |  | Motorola 680x0 Linux
`mips-unknown-linux-uclibc` | ✓ |  | MIPS Linux with uClibc
`mipsel-sony-psp` | * |  | MIPS (LE) Sony PlayStation Portable (PSP)
`mipsel-unknown-linux-uclibc` | ✓ |  | MIPS (LE) Linux with uClibc
`mipsel-unknown-none` | * |  | Bare MIPS (LE) softfloat
`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-unknown-openbsd` | ? |  |
`powerpc-wrs-vxworks-spe` | ? |  |
`powerpc-wrs-vxworks` | ? |  |
`powerpc64-unknown-freebsd` | ✓ | ✓ | PPC64 FreeBSD (ELFv1 and ELFv2)
`powerpc64le-unknown-freebsd` |   |   | PPC64LE FreeBSD
`powerpc-unknown-freebsd` |   |   | PowerPC FreeBSD
`powerpc64-unknown-linux-musl` | ? |  |
`powerpc64-wrs-vxworks` | ? |  |
`powerpc64le-unknown-linux-musl` | ? |  |
`riscv32gc-unknown-linux-gnu` |   |   | RISC-V Linux (kernel 5.4, glibc 2.33)
`riscv32gc-unknown-linux-musl` |   |   | RISC-V Linux (kernel 5.4, musl + RISCV32 support patches)
`riscv32imc-esp-espidf` | ✓ |  | RISC-V ESP-IDF
`riscv64gc-unknown-linux-musl` |   |   | RISC-V Linux (kernel 4.20, musl 1.2.0)
`s390x-unknown-linux-musl` |  |  | S390x Linux (kernel 2.6.32, MUSL)
`sparc-unknown-linux-gnu` | ✓ |  | 32-bit SPARC Linux
`sparc64-unknown-netbsd` | ✓ | ✓ | NetBSD/sparc64
`sparc64-unknown-openbsd` | ? |  |
`thumbv4t-none-eabi` | * |  | ARMv4T T32
`thumbv7a-pc-windows-msvc` | ? |  |
`thumbv7a-uwp-windows-msvc` | ✓ |  |
`thumbv7neon-unknown-linux-musleabihf` | ? |  | Thumb2-mode ARMv7a Linux with NEON, MUSL
`wasm64-unknown-unknown` | * |  | WebAssembly
`x86_64-apple-ios-macabi` | ✓ |  | Apple Catalyst on x86_64
`x86_64-apple-tvos` | * | | x86 64-bit tvOS
`x86_64-pc-windows-msvc` | ✓ |  | 64-bit Windows XP support
`x86_64-sun-solaris` | ? |  | Deprecated target for 64-bit Solaris 10/11, illumos
`x86_64-unknown-dragonfly` | ✓ | ✓ | 64-bit DragonFlyBSD
`x86_64-unknown-haiku` | ✓ | ✓ | 64-bit Haiku
`x86_64-unknown-hermit` | ? |  |
`x86_64-unknown-l4re-uclibc` | ? |  |
`x86_64-unknown-none-hermitkernel` | ? |  | HermitCore kernel
`x86_64-unknown-none-linuxkernel` | * |  | Linux kernel modules
`x86_64-unknown-openbsd` | ✓ | ✓ | 64-bit OpenBSD
`x86_64-unknown-uefi` | * |  | 64-bit 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
