在 OpenHarmony 开发板上运行 WasmEdge 原创 精华

# 获取到 docker 镜像后
$ docker run -it -v $(pwd):/home/openharmony openharmony-docker-standard:0.0.5
$ ./build.sh --product-name Hi3516DV300
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$ docker run -it -v $(pwd):/home/openharmony openharmony-docker-standard:0.0.5
$ cd third_party
$ git clone https://github.com/WasmEdge/WasmEdge.git
$ cd WasmEdge
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{
  ...
  
  "wasmedge": {
    "path": "third_party/WasmEdge",
    "name": "wasmedge"
  },
  
  ...
}
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{
  ...
  "parts":{
    ...
    "wasmedge:wasmedge":{}
  }
}
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$ docker run -it -v $(pwd):/home/openharmony openharmony-docker-standard:0.0.5
$ cd third_party/WasmEdge/utils/ohos
$ ./build_for_ohos.sh /home/openharmony
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...

post_process
=====build Hi3516DV300 successful.
2021-12-15 03:18:50
++++++++++++++++++++++++++++++++++++++++
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$ cd /home/openharmony/out/ohos-arm-release/packages/phone/system/bin
$ ls 
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# cd /system/usr/wasmedge_example
# wasmedge hello.wasm 1 2 3
hello
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# wasmedge --reactor add.wasm add 2 2
4
# wasmedge --reactor fibonacci.wasm fib 8
34
# wasmedge --reactor factorial.wasm fac 12
479001600
#
# cd js
# wasmedge --dir .:. qjs.wasm hello.js 1 2 3
Hello 1 2 3
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  set(TOOLSCHAIN_PATH "${OHOS_DIR_PATH}/prebuilts/clang/ohos/linux-x86_64/llvm")
  set(TOOLCHAIN_HOST "${TOOLSCHAIN_PATH}/bin")
  set(OHOS_SYSROOT_PATH "${OHOS_DIR_PATH}/out/ohos-arm-release/obj/third_party/musl")
  set(CMAKE_SYSROOT ${OHOS_SYSROOT_PATH})
  set(CMAKE_CROSSCOMPILING TRUE)
  set(CMAKE_SYSTEM_NAME "Generic")
  set(CMAKE_CXX_COMPILER_ID Clang)
  set(CMAKE_TOOLCHAIN_PREFIX llvm-)
  set(LLVM_PATH "${OHOS_DIR_PATH}/prebuilts/clang/ohos/linux-x86_64/llvm")
  include_directories(${LLVM_PATH}/include/c++/v1)
  include_directories(${OHOS_SYSROOT_PATH}/usr/include/arm-linux-ohosmusl)
  link_directories(${OHOS_SYSROOT_PATH}/usr/lib/arm-linux-ohosmusl)
  set(TOOLCHAIN_CC "${TOOLCHAIN_HOST}/clang")
  set(TOOLCHAIN_CXX "${TOOLCHAIN_HOST}/clang++")
  set(CMAKE_C_COMPILER ${TOOLCHAIN_CC})
  set(CMAKE_C_FLAGS "--target=arm-linux-ohosmusl -D__clang__ -march=armv7-a -mfloat-abi=softfp -mtune=generic-armv7-a -mfpu=neon -mthumb -w --sysroot=${OHOS_SYSROOT_PATH}")
  set(CMAKE_CXX_COMPILER ${TOOLCHAIN_CXX})
  set(CMAKE_CXX_FLAGS "--target=arm-linux-ohosmusl -D__clang__ -march=armv7-a -mfloat-abi=softfp -mtune=generic-armv7-a -mfpu=neon -mthumb -w --sysroot=${OHOS_SYSROOT_PATH}")
  set(MY_LINK_FLAGS "--target=arm-linux-ohosmusl --sysroot=${OHOS_SYSROOT_PATH}")
  set(CMAKE_LINKER clang)
  set(CMAKE_CXX_LINKER clang++)
  set(CMAKE_C_LINKER clang)
  set(CMAKE_C_LINK_EXECUTABLE "${CMAKE_C_LINKER} ${MY_LINK_FLAGS} <FLAGS> <LINK_FLAGS> <OBJECTS> -o <TARGET> <LINK_LIBRARIES>")
  set(CMAKE_CXX_LINK_EXECUTABLE "${CMAKE_CXX_LINKER} ${MY_LINK_FLAGS} <FLAGS> <LINK_FLAGS> <OBJECTS> -o <TARGET> <LINK_LIBRARIES>")
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ohos_copy("spdlog"){
    sources = [
        "$WASMEDGE_ROOT_DIR/build/_deps/spdlog-build/libspdlog.a",
    ]
    outputs = [
        target_out_dir + "/lib/libspdlog.a"
    ]
    module_install_name = ""
}

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../../third_party/WasmEdge/lib/system/allocator.cpp:64:40: error: unused variable 'k4G' [-Werror,-Wunused-const-variable]
static inline constexpr const uint64_t k4G = UINT64_C(0x100000000);
                                       ^
../../third_party/WasmEdge/lib/system/allocator.cpp:65:40: error: unused variable 'k12G' [-Werror,-Wunused-const-variable]
static inline constexpr const uint64_t k12G = UINT64_C(0x300000000);
                                       ^
1 warning and 2 errors generated.
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cflags = [
  ...
  "-Wno-unused-const-variable",
  ...
]

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../../third_party/WasmEdge/lib/host/wasi/inode-linux.cpp:745:3: error: cannot use 'try' with exceptions disabled
  try {
  ^
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# BUILD.gn 使用到该源码的相应模块
{
  ...
  cflags_cc = [ 
    ...
    "-fexceptions",
    ...
  ]
}
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