Move forge platform-support to the rustc book.

2 files changed, 223 insertions, 0 deletions

diff --git a/src/doc/rustc/src/SUMMARY.md b/src/doc/rustc/src/SUMMARY.md
index b603c7b231e..57013e9194b 100644
--- a/src/doc/rustc/src/SUMMARY.md
+++ b/src/doc/rustc/src/SUMMARY.md
@@ -11,6 +11,7 @@
         - [Deny-by-default lints](lints/listing/deny-by-default.md)
 - [Codegen options](codegen-options/index.md)
 - [JSON Output](json.md)
+- [Platform Support](platform-support.md)
 - [Targets](targets/index.md)
     - [Built-in Targets](targets/built-in.md)
     - [Custom Targets](targets/custom.md)
diff --git a/src/doc/rustc/src/platform-support.md b/src/doc/rustc/src/platform-support.md
new file mode 100644
index 00000000000..549f8b84054
--- /dev/null
+++ b/src/doc/rustc/src/platform-support.md
@@ -0,0 +1,222 @@
+# Rust Platform Support
+
+The Rust compiler runs on, and compiles to, a great number of platforms, though
+not all platforms are equally supported. Rust's support levels 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 below indicate
+whether the corresponding component works on the specified platform.
+
+## 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 | rustc | cargo | notes
+-------|-----|-------|-------|-------
+`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 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 (kernel 2.6.32+, glibc 2.11+)
+
+## 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 | rustc | cargo | notes
+-------|-----|-------|-------|-------
+`aarch64-apple-ios` | ✓ |  |  | ARM64 iOS
+`aarch64-fuchsia` | ✓ |  |  | ARM64 Fuchsia
+`aarch64-linux-android` | ✓ |  |  | ARM64 Android
+`aarch64-pc-windows-msvc` | ✓ |  |  | ARM64 Windows MSVC
+`aarch64-unknown-linux-gnu` | ✓ | ✓ | ✓ | ARM64 Linux (kernel 4.2, glibc 2.17)
+`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 Baseline, 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-cloudabi` | ✓ |  |  | 64-bit CloudABI
+`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 | rustc | cargo | notes
+-------|-----|-------|-------|-------
+`aarch64-apple-darwin` | ? |  |  | ARM64 macOS
+`aarch64-apple-tvos` | ** |  |  | ARM64 tvOS
+`aarch64-unknown-cloudabi` | ✓ |  |  | ARM64 CloudABI
+`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` | ? |  |  |
+`armv6-unknown-freebsd` | ✓ | ✓ | ✓ | ARMv6 FreeBSD
+`armv6-unknown-netbsd-eabihf` | ? |  |  |
+`armv7-apple-ios` | ✓ |  |  | RMv7 iOS, Cortex-
+`armv7-unknown-cloudabi-eabihf` | ✓ |  |  | ARMv7 CloudABI, hardfloat
+`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-unknown` | ? |  |  | AVR
+`hexagon-unknown-linux-musl` | ? |  |  |
+`i386-apple-ios` | ✓ |  |  | 32-bit x86 iOS
+`i686-apple-darwin` | ✓ | ✓ | ✓ | 32-bit OSX (10.7+, Lion+)
+`i686-pc-windows-msvc` | ✓ |  |  | 32-bit Windows XP support
+`i686-unknown-cloudabi` | ✓ |  |  | 32-bit CloudABI
+`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-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` | ? |  |  |
+`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
+`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` | ? |  |  |
+
+
+\* These targets only support `core`, not `alloc` or `std`.
+
+\*\* These targets only support `core` or `alloc`, not `std`.
+
+? These are targets that haven't yet been documented here. If you can shed some
+  light on these platforms support, please create an issue or PR on the [Rust
+  Forge repo].
+
+But those aren't the only platforms Rust can compile to! Those are the ones with
+built-in target definitions and/or standard library support. When linking only
+to the core library, Rust can also target additional "bare metal" platforms in
+the x86, ARM, MIPS, and PowerPC families, though it may require defining custom
+target specifications to do so.
+
+[runs on NVIDIA GPUs]: https://github.com/japaric-archived/nvptx#targets
+[Rust Forge repo]: https://github.com/rust-lang/rust-forge