在macOS High Sierra上使用Boost.Filesystem编译时的链接器错误

Question

我目前正在尝试编译一个在macOS High Sierra 10.13.4上使用Boost.Filesystem的程序。我也使用 gcc 7.3 进行编译，我使用 Homebrew 手动安装。程序将编译，但在链接过程中抛出以下错误

Undefined symbols for architecture x86_64:
  "boost::filesystem::path_traits::dispatch(boost::filesystem::directory_entry const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&)", referenced from:
      boost::enable_if<boost::filesystem::path_traits::is_pathable<boost::decay<boost::filesystem::directory_entry>::type>, boost::filesystem::path&>::type boost::filesystem::path::operator=<boost::filesystem::directory_entry>(boost::filesystem::directory_entry const&) in world.cc.o
ld: symbol(s) not found for architecture x86_64
collect2: error: ld returned 1 exit status

我正在使用 cmake 进行构建，我的 CMakeLists.txt 文件如下所示

cmake_minimum_required (VERSION 3.0)
MESSAGE(STATUS "Compiler: " ${CMAKE_CXX_COMPILER})
# variables for CMAKE
set(PROJECT sealab)
set(BINARY ${PROJECT}.out)
set(SRC_DIR src/)
set(INC_DIR inc/)
FILE(GLOB_RECURSE SRC ${SRC_DIR}/*.cc)
# library include dirs
set(IMGUI_INC libs/imgui/)
set(SPDLOG_INC libs/spdlog/include/)
set(JSON_INC libs/json/include/)
set(
    LIB_INC 
    ${IMGUI_INC} 
    ${SPDLOG_INC} 
    ${JSON_INC} 
    ${GLM_INC}
)
# library src files
FILE(GLOB IMGUI_SRC ${IMGUI_INC}*.cpp)
FILE(GLOB SPDLOG_SRC ${SPDLOG_INC}*.cpp)
set(
    LIB_SRC 
    ${IMGUI_SRC} 
    ${SPDLOG_SRC}
)
project(${PROJECT})
# version number
set(${PROJECT}_VERSION_MAJOR 0)
set(${PROJECT}_VERSION_MINOR 1)
# Compilation Database
set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
# C++ standard
set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wno-unused-local-typedefs")
# threads
set(THREADS_PREFER_PTHREAD_FLAG ON)
# adding packages
find_package(OpenGL    REQUIRED)
find_package(GLEW      REQUIRED)
find_package(glfw3 3.2 REQUIRED)
find_package(Threads   REQUIRED)
find_package(Assimp    REQUIRED)
find_package(glm       REQUIRED)
find_package(Boost COMPONENTS system filesystem REQUIRED)
set(Boost_USE_MULTITHREADED  ON)
set(Boost_USE_STATIC_LIBS    ON)
set(Boost_USE_STATIC_RUNTIME ON)
# adding directories and source files
include_directories(
    ${OPENGL_INCLUDE_DIRS} 
    ${GLEW_INCLUDE_DIRS} 
    ${ASSIMP_INCLUDE_DIRS} 
    ${GLM_INCLUDE_DIRS}
    ${Boost_INCLUDE_DIRS}
)
include_directories(${INC_DIR} ${LIB_INC})
link_directories(${INC_DIR} ${LIB_INC})
# adding source files
add_executable(${BINARY} ${SRC} ${LIB_SRC})
set_target_properties(${BINARY} PROPERTIES COTIRE_UNITY_TARGET_NAME "unity")
# linking libraries
target_link_libraries(
    ${BINARY} 
    OpenGL::GL 
    ${GLEW_LIBRARIES} 
    Threads::Threads 
    ${ASSIMP_LIBRARIES} 
    glfw 
    glm 
    ${Boost_LIBRARIES}
)

我正在使用命令cmake -DCMAKE_C_COMPILER=$CC -DCMAKE_CXX_COMPILER=$CXX .来生成 Makefile，并且环境变量 $CC 和 $CXX 设置为由 Homebrew 创建的 gcc 和 g++ 版本。

我查看了其他几个 stackoverflow 答案，其中人们有相同的错误，所有这些都是错误链接的结果。我以与正确答案相同的方式进行链接，但错误仍然存在。我是否仍然错误地链接它，或者这里还有其他事情发生？

Answer 1

所以我发现了发生了什么。这让我意识到，也许瓶装自制的 Boost 1.66.0 库不是使用 GCC 构建的。我将编译器切换到 clang，现在它可以很好地编译。