How to link against boost.system with cmake

Question

I use a cmake generated makefile to compile a c++ file that depends on the boost filesystem library.

During the linking process I get the following error:

 Undefined symbols:   "boost::system::get_generic_category()", referenced from:       __static_initialization_and_destruction_0(int, int)in FaceRecognizer.cpp.o       __static_initialization_and_destruction_0(int, int)in FaceRecognizer.cpp.o       __static_initialization_and_destruction_0(int, int)in FaceRecognizer.cpp.o   "boost::system::get_system_category()", referenced from:       __static_initialization_and_destruction_0(int, int)in FaceRecognizer.cpp.o       __static_initialization_and_destruction_0(int, int)in FaceRecognizer.cpp.o ld: symbol(s) not found collect2: ld returned 1 exit status make[2]: *** [src/ImageMarker] Error 1 

The action from the makefile that generates this error is this line:

 cd /Users/janusz/Documents/workspace/ImageMarker/Debug/src && /opt/local/bin/cmake -E cmake_link_script CMakeFiles/ImageMarker.dir/link.txt --verbose=1 /usr/bin/c++   -O3 -Wall -Wno-deprecated -g -verbose -Wl,-search_paths_first -headerpad_max_install_names -fPIC CMakeFiles/ImageMarker.dir/ImageMarker.cpp.o CMakeFiles/ImageMarker.dir/Image.cpp.o CMakeFiles/ImageMarker.dir/utils.cpp.o CMakeFiles/ImageMarker.dir/XMLWriter.cpp.o CMakeFiles/ImageMarker.dir/FaceRecognizer.cpp.o  -o ImageMarker  -L/opt/local/lib ../libTinyXml.a /opt/local/lib/libboost_filesystem-mt.dylib  

Some googling showed me that this error seems to be common on macs with the boost file system library because I have to link against a boost.system library or make my project depending on the boost.system library.

How do i force cmake to link against the library without hardcoding the library path?

Here the result from otool:

otool -L /opt/local/lib/libboost_filesystem-mt.dylib  /opt/local/lib/libboost_filesystem-mt.dylib:  /opt/local/lib/libboost_filesystem-mt.dylib (compatibility version 0.0.0, current version 0.0.0)    /opt/local/lib/libboost_system-mt.dylib (compatibility version 0.0.0, current version 0.0.0)     /usr/lib/libstdc++.6.dylib (compatibility version 7.0.0, current version 7.4.0)  /usr/lib/libgcc_s.1.dylib (compatibility version 1.0.0, current version 1.0.0)  /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 111.0.0) 

Answer 1

On linux CMake figures itself that boost_filesystem is linked against boost_system. Obviously you have to tell it explicitly on Mac:

find_package(Boost COMPONENTS system filesystem REQUIRED) #... target_link_libraries(mytarget    ${Boost_FILESYSTEM_LIBRARY}   ${Boost_SYSTEM_LIBRARY} )