Linking with error using boost library and clion - c++

Question

I have a linking problem, when I am trying to use filesystem from boost. I copied code from tutorial:
#include <iostream>
#include <boost/filesystem.hpp>
using namespace boost::filesystem;
int main(int argc, char* argv[])
{
if (argc < 2)
{
std::cout << "Usage: tut1 path\n";
return 1;
}
std::cout << argv[1] << " " << file_size(argv[1]) << '\n';
return 0;
}
Perhaps it should work, but I have such an error:
Scanning dependencies of target untitled
[ 50%] Building CXX object CMakeFiles/untitled.dir/main.cpp.o
[100%] Linking CXX executable untitled
Undefined symbols for architecture x86_64:
"boost::filesystem::detail::file_size(boost::filesystem::path const&, boost::system::error_code*)", referenced from:
boost::filesystem::file_size(boost::filesystem::path const&) in main.cpp.o
"boost::system::system_category()", referenced from:
___cxx_global_var_init.2 in main.cpp.o
"boost::system::generic_category()", referenced from:
___cxx_global_var_init in main.cpp.o
___cxx_global_var_init.1 in main.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[3]: *** [untitled] Error 1
make[2]: *** [CMakeFiles/untitled.dir/all] Error 2
make[1]: *** [CMakeFiles/untitled.dir/rule] Error 2
make: *** [untitled] Error 2
My CMakeLists.txt file:
cmake_minimum_required(VERSION 3.7)
project(untitled)
set(CMAKE_CXX_STANDARD 11)
set(SOURCE_FILES main.cpp)
add_executable(untitled ${SOURCE_FILES})
find_package(Boost)
IF (Boost_FOUND)
include_directories(${Boost_INCLUDE_DIR})
endif()
What can I improve to compile this code? I use CLion editor on OSX.

Answer 1

Change this line in your CMakeList.txt:
find_package(Boost)
by
find_package(Boost COMPONENTS system filesystem REQUIRED)
And don't forget to link with your target:
target_link_libraries(untitled
${Boost_FILESYSTEM_LIBRARY}
${Boost_SYSTEM_LIBRARY}
)
So your CMakeList.txt will be:
cmake_minimum_required(VERSION 3.7)
project(untitled)
set(CMAKE_CXX_STANDARD 11)
set(SOURCE_FILES main.cpp)
add_executable(untitled ${SOURCE_FILES})
find_package(Boost COMPONENTS system filesystem REQUIRED)
IF (Boost_FOUND)
include_directories(${Boost_INCLUDE_DIR})
target_link_libraries(untitled
${Boost_FILESYSTEM_LIBRARY}
${Boost_SYSTEM_LIBRARY}
)
endif()