linking boost log using cmake error

Question

what can cause the following problem: I tried to use boost::log in a cmake project.

My CMakeList.txt file looks like this:

cmake_minimum_required(VERSION 3.10)
project(boostLogTest)
set(CMAKE_CXX_STANDARD 11)
add_executable(boostLogTest main.cpp)
ADD_DEFINITIONS(-DBOOST_LOG_DYN_LINK) #####  edit after DiCri's answer #####
find_package(Boost REQUIRED COMPONENTS log system)

if (Boost_FOUND)
    include_directories(${Boost_INCLUDE_DIRS})

    message("Boost VERSION: ${Boost_VERSION}")
    message("Boost INCLUDE_DIRS: ${Boost_INCLUDE_DIRS}")
    message("Boost Boost_LIBRARY_DIRS: ${Boost_LIBRARY_DIRS}")
    message("Boost LIBRARIES: ${Boost_LIBRARIES}")

    TARGET_LINK_LIBRARIES(boostLogTest ${Boost_LIBRARIES})
endif ()

and my main.cpp file looks like this:

#include <iostream>

#include <boost/log/trivial.hpp>

int main(int, char*[])
{
    BOOST_LOG_TRIVIAL(trace) << "A trace severity message";
    BOOST_LOG_TRIVIAL(debug) << "A debug severity message";
    BOOST_LOG_TRIVIAL(info) << "An informational severity message";
    BOOST_LOG_TRIVIAL(warning) << "A warning severity message";
    BOOST_LOG_TRIVIAL(error) << "An error severity message";
    BOOST_LOG_TRIVIAL(fatal) << "A fatal severity message";

    return 0;
}

My CMake output is the following

-- Boost version: 1.64.0

-- Found the following Boost libraries:

-- log

-- system

-- date_time

-- log_setup

-- filesystem

-- thread

-- regex

-- chrono

-- atomic Boost VERSION: 106400 Boost INCLUDE_DIRS: /usr/local/include Boost Boost_LIBRARY_DIRS: /usr/local/lib Boost

LIBRARIES: /usr/local/lib/libboost_log.so;/usr/local/lib/libboost_system.so;/usr/local/lib/libboost_date_time.so;/usr/local/lib/libboost_log_setup.so;/usr/local/lib/libboost_filesystem.so;/usr/local/lib/libboost_thread.so;/usr/local/lib/libboost_regex.so;/usr/local/lib/libboost_chrono.so;/usr/local/lib/libboost_atomic.so

-- Configuring done

-- Generating done

-- Build files have been written to: /home/.../CLionProjects/boostLogTest/cmake-build-debug

but while linking I get the following error messages:

[ 50%] Linking CXX executable boostLogTest

CMakeFiles/boostLogTest.dir/main.cpp.o: In function `main':

/home/.../CLionProjects/boostLogTest/main.cpp:7: undefined reference to `boost::log::v2s_mt_posix::trivial::logger::get()'

/home/.../CLionProjects/boostLogTest/main.cpp:7: undefined reference to `boost::log::v2s_mt_posix::trivial::logger::get()'

/home/.../CLionProjects/boostLogTest/main.cpp:8: undefined reference to `boost::log::v2s_mt_posix::trivial::logger::get()'

/home/.../CLionProjects/boostLogTest/main.cpp:8: undefined reference to `boost::log::v2s_mt_posix::trivial::logger::get()'

/home/.../CLionProjects/boostLogTest/main.cpp:9: undefined reference to boost::log::v2s_mt_posix::trivial::logger::get()' CMakeFiles/boostLogTest.dir/main.cpp.o:/home/.../CLionProjects/boostLogTest/main.cpp:9: more undefined references toboost::log::v2s_mt_posix::trivial::logger::get()' follow ...

Edit after DiCri's answer: Now I get the following error messages:

[ 50%] Linking CXX executable boostLogTest

/usr/bin/ld: CMakeFiles/boostLogTest.dir/main.cpp.o: undefined reference to symbol 'pthread_rwlock_unlock@@GLIBC_2.2.5'

//lib/x86_64-linux-gnu/libpthread.so.0: error adding symbols: DSO missing from command line

collect2: error: ld returned 1 exit status

CMakeFiles/boostLogTest.dir/build.make:103: recipe for target 'boostLogTest' failed

make[3]: *** [boostLogTest] Error 1

CMakeFiles/Makefile2:67: recipe for target 'CMakeFiles/boostLogTest.dir/all' failed

make[2]: *** [CMakeFiles/boostLogTest.dir/all] Error 2

CMakeFiles/Makefile2:79: recipe for target 'CMakeFiles/boostLogTest.dir/rule' failed

make[1]: *** [CMakeFiles/boostLogTest.dir/rule] Error 2

Makefile:118: recipe for target 'boostLogTest' failed

make: *** [boostLogTest] Error 2

If I add

set(Boost_USE_STATIC_LIBS        ON)

the paths to the libraries change to a *.a file, like:

Boost LIBRARIES: /usr/local/lib/libboost_log.a;/usr/local/lib/libboost_system.a;...

All listed libraries (the *.so and the *.a) exist in this folders.

What am I missing?

manudicri manudicri · Accepted Answer · 2018-07-25T07:58:48

Just try to add this line

#define BOOST_LOG_DYN_LINK 1

As the first line of the main.cpp file, i think it should work, someone got your same issue here

If that doesn't work, try to add this line

ADD_DEFINITIONS(-DBOOST_LOG_DYN_LINK)

To CMake file You need to add OpenMP package too

linking boost log using cmake error

1 Answers