一个月后回到项目,我成功地运行了CMake,并得到了以下输出结果:
-- Boost version: 1.61.0
-- Found the following Boost libraries:
-- system
-- thread
-- filesystem
-- chrono
-- date_time
-- atomic
-- Configuring done
-- Generating done
-- Build files have been written to: /Users/LittleNewt/gitness/MangaMeCLI/build
但是由于某种原因,当对生成的 MakeFile 运行 Make 命令时,会得到以下输出。
[ 50%] Building CXX object CMakeFiles/mangaMeCLI.dir/src/mangaMeCLI.cpp.o
[100%] Linking CXX executable mangaMeCLI
Undefined symbols for architecture x86_64:
"boost::filesystem::path::operator/=(char const*)", referenced from:
_main in mangaMeCLI.cpp.o
"boost::filesystem::path::operator/=(boost::filesystem::path const&)", referenced from:
boost::filesystem::path::operator/=(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >&) in mangaMeCLI.cpp.o
boost::filesystem::path::operator/=(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&) in mangaMeCLI.cpp.o
"boost::filesystem::detail::current_path(boost::system::error_code*)", referenced from:
boost::filesystem::current_path() in mangaMeCLI.cpp.o
"boost::filesystem::detail::create_directory(boost::filesystem::path const&, boost::system::error_code*)", referenced from:
boost::filesystem::create_directory(boost::filesystem::path const&) in mangaMeCLI.cpp.o
"boost::filesystem::detail::status(boost::filesystem::path const&, boost::system::error_code*)", referenced from:
boost::filesystem::exists(boost::filesystem::path const&) in mangaMeCLI.cpp.o
boost::filesystem::is_directory(boost::filesystem::path const&) in mangaMeCLI.cpp.o
"boost::system::system_category()", referenced from:
___cxx_global_var_init.75 in mangaMeCLI.cpp.o
"boost::system::generic_category()", referenced from:
___cxx_global_var_init.73 in mangaMeCLI.cpp.o
___cxx_global_var_init.74 in mangaMeCLI.cpp.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make[2]: *** [mangaMeCLI] Error 1
make[1]: *** [CMakeFiles/mangaMeCLI.dir/all] Error 2
make: *** [all] Error 2
我做了一些研究,发现其他人也因为没有链接正确版本的库(64位与32位)而遇到了相同的问题,但我不确定如何确定这是否是我的问题所在。
这是我的未更改的CMakeLists.txt文件:
CMAKE_MINIMUM_REQUIRED(VERSION 3.4.1)
PROJECT(MangaMeCLI)
SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
INCLUDE_DIRECTORIES(includes)
ADD_EXECUTABLE(mangaMeCLI src/mangaMeCLI.cpp)
MESSAGE("${CMAKE_CXX_FLAGS}")
SET(Boost_USE_MULTITHREADED ON)
FIND_PACKAGE(Boost REQUIRED COMPONENTS system thread filesystem)
INCLUDE_DIRECTORIES(${BOOST_INCLUDE_DIRS})
TARGET_LINK_LIBRARIES(mangaMeCLI ${BOOST_LIBRARIES})
SET(OPENSSL_ROOT_DIR /usr/local/Cellar/openssl/*)
FIND_PACKAGE(OpenSSL REQUIRED)
INCLUDE_DIRECTORIES(${OPENSSL_INCLUDE_DIR})
TARGET_LINK_LIBRARIES(mangaMeCLI ${OPENSSL_LIBRARIES})
FIND_PACKAGE(cppnetlib REQUIRED)
INCLUDE_DIRECTORIES(${CPPNETLIB_INCLUDE_DIRS})
TARGET_LINK_LIBRARIES(mangaMeCLI ${CPPNETLIB_LIBRARIES})
阅读了一条有用的评论后,我发现 BOOST_LIBRARIES 变量为空,尽管cmake打印出它找到了我要寻找的boost库。我认为这就是我错误的原因。
message(${BOOST_LIBRARIES})
行来输出此变量的值(在cmake
阶段),并检查库。 - Tsyvarevfind_package(Boost...)
之前尝试使用set(Boost_DEBUG ON)
来启用 FindBoost 的调试输出。 - piwi