CMake 找不到 Boost_LIBRARIES 变量

Question

Final Edit: Solved. Guys the problem occured because of the "WinSock32". I've added

target_link_libraries(modernC__ -lws2_32)

and the code has been builded.

I have been using the Boost library on CLion in Ubuntu for about 1 year. But this week I also decided to install it on the Windows operating system. so I downloaded the Boost library on GitHub and installed the Boost library using Find.Boost first and then "Find.Boost".

After writing the necessary commands in CMake settings section in CLion, I noticed that the variable $ {Boost_LIBRARIES} is empty.

When I don't use the message () function, the "CMake" part of the project does not give an error, but I get the error "undefined reference" after "build". Below are the CMake commands I wrote on CLion and the errors I received.

cmake_minimum_required(VERSION 3.16)
project(modernC__)

set(CMAKE_CXX_STANDARD 17)
find_package(Boost 1.66.0)

message(${Boost_INCLUDE_DIR})
message(${Boost_FOUND})
message(${Boost_LIBRARY_DIRS})

IF (Boost_FOUND)
    include_directories(${Boost_INCLUDE_DIR})
add_executable(modernC__

        main.cpp

        #concurrencyExampleOne.cpp

        #adapterExampleOne.cpp
        )
target_link_libraries(modernC__ ${Boost_LIBRARIES})
    message(${Boost_LIBRARIES})
endif()

My output is:

"C:\Program Files\JetBrains\CLion 2020.1.1\bin\cmake\win\bin\cmake.exe" -DCMAKE_BUILD_TYPE=Debug -G "CodeBlocks - MinGW Makefiles" C:\Users\Berke\CLionProjects\modernC++
C:/boost/include/boost-1_66
TRUE
C:/boost/lib
CMake Error at CMakeLists.txt:22 (message):
  message called with incorrect number of arguments


-- Configuring incomplete, errors occurred!

In this case, obviously Cmake is currently unable to find the.lib files that should link to my code. My question is; How can I permanently drop.lib files into this variable, or is there any other way to do this?

If I do not use "message(${Boost_LIBRARIES}" so the compiler gives me this error;

[ 50%] Linking CXX executable modernC__.exe
CMakeFiles\modernC__.dir/objects.a(main.cpp.obj): In function `ZNK5boost6system14error_category12std_category10equivalentEiRKSt15error_condition':
C:/boost/include/boost-1_66/boost/system/error_code.hpp:676: undefined reference to `boost::system::generic_category()'
C:/boost/include/boost-1_66/boost/system/error_code.hpp:679: undefined reference to `boost::system::generic_category()'
CMakeFiles\modernC__.dir/objects.a(main.cpp.obj): In function `ZNK5boost6system14error_category12std_category10equivalentERKSt10error_codei':
C:/boost/include/boost-1_66/boost/system/error_code.hpp:706: undefined reference to `boost::system::generic_category()'
C:/boost/include/boost-1_66/boost/system/error_code.hpp:709: undefined reference to `boost::system::generic_category()'
C:/boost/include/boost-1_66/boost/system/error_code.hpp:721: undefined reference to `boost::system::generic_category()'
CMakeFiles\modernC__.dir/objects.a(main.cpp.obj): In function `ZN5boost4asio5error19get_system_categoryEv':
C:/boost/include/boost-1_66/boost/asio/error.hpp:230: undefined reference to `boost::system::system_category()'
CMakeFiles\modernC__.dir/objects.a(main.cpp.obj): In function `ZN5boost4asio6detail17winsock_init_base7startupERNS2_4dataEhh':
C:/boost/include/boost-1_66/boost/asio/detail/impl/winsock_init.ipp:39: undefined reference to `_imp__WSAStartup@8'
CMakeFiles\modernC__.dir/objects.a(main.cpp.obj): In function `ZN5boost4asio6detail17winsock_init_base7cleanupERNS2_4dataE':
C:/boost/include/boost-1_66/boost/asio/detail/impl/winsock_init.ipp:56: undefined reference to `_imp__WSACleanup@0'
collect2.exe: error: ld returned 1 exit status
mingw32-make.exe[3]: *** [CMakeFiles\modernC__.dir\build.make:86: modernC__.exe] Error 1
mingw32-make.exe[2]: *** [CMakeFiles\Makefile2:75: CMakeFiles/modernC__.dir/all] Error 2
mingw32-make.exe[1]: *** [CMakeFiles\Makefile2:82: CMakeFiles/modernC__.dir/rule] Error 2
mingw32-make.exe: *** [Makefile:117: modernC__] Error 2

Answer 1

I think, you should specify boost libraries (as components) explicitly. And you should add libraries to target.

Like this:

find_package(Boost COMPONENTS filesystem system locale context REQUIRED)

...

target_link_libraries(${PROJECT_NAME}
  ...
  ${Boost_FILESYSTEM_LIBRARY}
  ${Boost_SYSTEM_LIBRARY}
  ${Boost_LOCALE_LIBRARY}
  ${Boost_CONTEXT_LIBRARY}
  ...
  )