在Flutter FFI插件中集成Boost库构建失败求助

环境信息 #

• OS：Windows 10
• 工具：Android Studio Koala | 2024.1.1
• CMake版本：3.30.0-rc3

操作背景 #

通过命令 flutter create --template=plugin_ffi --platforms=android,ios,linux,macos,windows ffigen_app 创建Flutter FFI插件项目，尝试集成Boost库。

集成Boost的操作步骤 #

1. 通过vcpkg安装Boost库后，在src目录添加CmakePresets.json文件，内容如下：

{
    "version": 8,
    "configurePresets": [
        {
            "name": "GCC 6.3.0 mingw32",
            "displayName": "GCC 6.3.0 mingw32",
            "description": "Using compilers: C = C:\\MinGW\\bin\\gcc.exe, CXX = C:\\MinGW\\bin\\g++.exe",
            "binaryDir": "${sourceDir}/out/build/${presetName}",
            "cacheVariables": {
                "CMAKE_TOOLCHAIN_FILE": "c:/vcpkg/scripts/buildsystems/vcpkg.cmake",
                "CMAKE_INSTALL_PREFIX": "${sourceDir}/out/install/${presetName}",
                "CMAKE_C_COMPILER": "C:/MinGW/bin/gcc.exe",
                "CMAKE_CXX_COMPILER": "C:/MinGW/bin/g++.exe",
                "CMAKE_BUILD_TYPE": "Debug"
            }
        }
    ]
}

2. 修改CMakeLists.txt：

cmake_minimum_required(VERSION 3.10)

project(ffi_gen_library VERSION 0.0.1 LANGUAGES C)

find_package(Boost REQUIRED)
include_directories(${Boost_INCLUDE_DIRS})

add_library(native_tcp SHARED  "ffi_gen.c")

set_target_properties(native_tcp PROPERTIES  PUBLIC_HEADER ffi_gen.h  OUTPUT_NAME "ffi_gen")

target_compile_definitions(ffi_gen PUBLIC DART_SHARED_LIB)

构建错误 #

构建项目时失败，核心错误为 Could NOT find Boost (missing: Boost_INCLUDE_DIR)，完整错误日志片段：

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':native_tcp:configureCMakeDebug[arm64-v8a]'.
> [CXX1405] error when building with cmake using G:\native_tcp\src\CMakeLists.txt: -- Configuring incomplete, errors occurred!
  See also "G:/native_tcp/android/.cxx/Debug/4r172ix6/arm64-v8a/CMakeFiles/CMakeOutput.log".

  ...

  CMake Error at C:/Users/ij/AppData/Local/Android/Sdk/cmake/3.18.1/share/cmake-3.18/Modules/FindPackageHandleStandardArgs.cmake:165 (message):
    Could NOT find Boost (missing: Boost_INCLUDE_DIR)
  Call Stack (most recent call first):
    C:/Users/ij/AppData/Local/Android/Sdk/cmake/3.18.1/share/cmake-3.18/Modules/FindPackageHandleStandardArgs.cmake:458 (_FPHSA_FAILURE_MESSAGE)
    C:/Users/ij/AppData/Local/Android/Sdk/cmake/3.18.1/share/cmake-3.18/Modules/FindBoost.cmake:2177 (find_package_handle_standard_args)
    CMakeLists.txt:11 (find_package)

1. 安装对应Android架构的Boost库 #

你当前构建的是Android arm64-v8a架构，但vcpkg默认安装的是Windows平台的Boost，需要交叉编译适配Android的版本：

• 执行vcpkg命令安装对应架构的Boost：

  vcpkg install boost:arm64-android
  

• 注意根据目标架构选择triplet：arm64-android、armeabi-v7a-android、x64-android等。

2. 修正CMake配置适配Android交叉编译 #

你的CmakePresets.json是针对Windows MinGW的，Android构建流程不会使用这个配置，需要调整：

• 方法一：在CMakeLists.txt开头添加vcpkg工具链和目标triplet配置：

  set(CMAKE_TOOLCHAIN_FILE "c:/vcpkg/scripts/buildsystems/vcpkg.cmake" CACHE STRING "Vcpkg toolchain file")
  set(VCPKG_TARGET_TRIPLET "arm64-android" CACHE STRING "Vcpkg target triplet")
  

• 方法二：在Android模块的build.gradle中添加CMake参数：

  android {
      externalNativeBuild {
          cmake {
              arguments "-DCMAKE_TOOLCHAIN_FILE=c:/vcpkg/scripts/buildsystems/vcpkg.cmake", "-DVCPKG_TARGET_TRIPLET=arm64-android"
          }
      }
  }
  

3. 手动指定Boost路径（可选） #

如果vcpkg安装路径明确，可直接在CMakeLists.txt中指定Boost头文件路径：

set(Boost_INCLUDE_DIR "C:/vcpkg/installed/arm64-android/include")
find_package(Boost REQUIRED)

4. 统一CMake版本 #

你本地用的是CMake 3.30.0-rc3，但Android SDK默认使用3.18.1，版本差异可能引发兼容性问题：

• 打开Android Studio的File > Settings > Build, Execution, Deployment > Build Tools > CMake，添加本地CMake路径（如C:\Program Files\CMake\bin\cmake.exe）；
• 在项目build.gradle中指定使用该版本。

5. 修正CMakeLists.txt中的语法错误 #

你的target_compile_definitions引用了不存在的ffi_gen目标，应该改为实际的库名native_tcp：

target_compile_definitions(native_tcp PUBLIC DART_SHARED_LIB)

内容的提问来源于stack exchange，提问作者임현재