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| 1 | +# `*-linux-ohos*` |
| 2 | + |
| 3 | +**Tier: 3** |
| 4 | + |
| 5 | +Targets for the [OpenHarmony](https://gitee.com/openharmony/docs/) operating |
| 6 | +system. |
| 7 | + |
| 8 | +## Target maintainers |
| 9 | + |
| 10 | +- Amanieu d'Antras ([@Amanieu](https://github.com/Amanieu)) |
| 11 | + |
| 12 | +## Setup |
| 13 | + |
| 14 | +The OpenHarmony SDK doesn't currently support Rust compilation directly, so |
| 15 | +some setup is required. |
| 16 | + |
| 17 | +First, you must obtain the OpenHarmony SDK from [this page](https://gitee.com/openharmony/docs/tree/master/en/release-notes). |
| 18 | +Select the version of OpenHarmony you are developing for and download the "Public SDK package for the standard system". |
| 19 | + |
| 20 | +Create the following shell scripts that wrap Clang from the OpenHarmony SDK: |
| 21 | + |
| 22 | +`aarch64-unknown-linux-ohos-clang.sh` |
| 23 | + |
| 24 | +```sh |
| 25 | +#!/bin/sh |
| 26 | +exec /path/to/ohos-sdk/linux/native/llvm/bin/clang \ |
| 27 | + -target aarch64-linux-ohos \ |
| 28 | + --sysroot=/path/to/ohos-sdk/linux/native/sysroot \ |
| 29 | + -D__MUSL__ \ |
| 30 | + "$@" |
| 31 | +``` |
| 32 | + |
| 33 | +`aarch64-unknown-linux-ohos-clang++.sh` |
| 34 | + |
| 35 | +```sh |
| 36 | +#!/bin/sh |
| 37 | +exec /path/to/ohos-sdk/linux/native/llvm/bin/clang++ \ |
| 38 | + -target aarch64-linux-ohos \ |
| 39 | + --sysroot=/path/to/ohos-sdk/linux/native/sysroot \ |
| 40 | + -D__MUSL__ \ |
| 41 | + "$@" |
| 42 | +``` |
| 43 | + |
| 44 | +`armv7-unknown-linux-ohos-clang.sh` |
| 45 | + |
| 46 | +```sh |
| 47 | +#!/bin/sh |
| 48 | +exec /path/to/ohos-sdk/linux/native/llvm/bin/clang \ |
| 49 | + -target arm-linux-ohos \ |
| 50 | + --sysroot=/path/to/ohos-sdk/linux/native/sysroot \ |
| 51 | + -D__MUSL__ \ |
| 52 | + -march=armv7-a \ |
| 53 | + -mfloat-abi=softfp \ |
| 54 | + -mtune=generic-armv7-a \ |
| 55 | + -mthumb \ |
| 56 | + "$@" |
| 57 | +``` |
| 58 | + |
| 59 | +`armv7-unknown-linux-ohos-clang++.sh` |
| 60 | + |
| 61 | +```sh |
| 62 | +#!/bin/sh |
| 63 | +exec /path/to/ohos-sdk/linux/native/llvm/bin/clang++ \ |
| 64 | + -target arm-linux-ohos \ |
| 65 | + --sysroot=/path/to/ohos-sdk/linux/native/sysroot \ |
| 66 | + -D__MUSL__ \ |
| 67 | + -march=armv7-a \ |
| 68 | + -mfloat-abi=softfp \ |
| 69 | + -mtune=generic-armv7-a \ |
| 70 | + -mthumb \ |
| 71 | + "$@" |
| 72 | +``` |
| 73 | + |
| 74 | +Future versions of the OpenHarmony SDK will avoid the need for this process. |
| 75 | + |
| 76 | +## Building the target |
| 77 | + |
| 78 | +To build a rust toolchain, create a `config.toml` with the following contents: |
| 79 | + |
| 80 | +```toml |
| 81 | +profile = "compiler" |
| 82 | +changelog-seen = 2 |
| 83 | + |
| 84 | +[build] |
| 85 | +sanitizers = true |
| 86 | +profiler = true |
| 87 | + |
| 88 | +[target.aarch64-unknown-linux-ohos] |
| 89 | +cc = "/path/to/aarch64-unknown-linux-ohos-clang.sh" |
| 90 | +cxx = "/path/to/aarch64-unknown-linux-ohos-clang++.sh" |
| 91 | +ar = "/path/to/ohos-sdk/linux/native/llvm/bin/llvm-ar" |
| 92 | +ranlib = "/path/to/ohos-sdk/linux/native/llvm/bin/llvm-ranlib" |
| 93 | +linker = "/path/to/aarch64-unknown-linux-ohos-clang.sh" |
| 94 | + |
| 95 | +[target.armv7-unknown-linux-ohos] |
| 96 | +cc = "/path/to/armv7-unknown-linux-ohos-clang.sh" |
| 97 | +cxx = "/path/to/armv7-unknown-linux-ohos-clang++.sh" |
| 98 | +ar = "/path/to/ohos-sdk/linux/native/llvm/bin/llvm-ar" |
| 99 | +ranlib = "/path/to/ohos-sdk/linux/native/llvm/bin/llvm-ranlib" |
| 100 | +linker = "/path/to/armv7-unknown-linux-ohos-clang.sh" |
| 101 | +``` |
| 102 | + |
| 103 | +## Building Rust programs |
| 104 | + |
| 105 | +Rust does not yet ship pre-compiled artifacts for this target. To compile for |
| 106 | +this target, you will either need to build Rust with the target enabled (see |
| 107 | +"Building the target" above), or build your own copy of `core` by using |
| 108 | +`build-std` or similar. |
| 109 | + |
| 110 | +You will need to configure the linker to use in `~/.cargo/config`: |
| 111 | +```toml |
| 112 | +[target.aarch64-unknown-linux-ohos] |
| 113 | +ar = "/path/to/ohos-sdk/linux/native/llvm/bin/llvm-ar" |
| 114 | +linker = "/path/to/aarch64-unknown-linux-ohos-clang.sh" |
| 115 | + |
| 116 | +[target.armv7-unknown-linux-ohos] |
| 117 | +ar = "/path/to/ohos-sdk/linux/native/llvm/bin/llvm-ar" |
| 118 | +linker = "/path/to/armv7-unknown-linux-ohos-clang.sh" |
| 119 | +``` |
| 120 | + |
| 121 | +## Testing |
| 122 | + |
| 123 | +Running the Rust testsuite is possible, but currently difficult due to the way |
| 124 | +the OpenHarmony emulator is set up (no networking). |
| 125 | + |
| 126 | +## Cross-compilation toolchains and C code |
| 127 | + |
| 128 | +You can use the shell scripts above to compile C code for the target. |
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