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:

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}
)

Answer 2

This is not an "answer" to the posted question, but an observation on my Ubuntu box.

To use the Boost libs, you have to explicitly write something like this:

find_package(Boost COMPONENTS regex system filesystem REQUIRED)

In addition, you need to link it this way:

target_link_libraries(binary
  ${Boost_FILESYSTEM_LIBRARY}
  ${Boost_SYSTEM_LIBRARY}
  ${Boost_REGEX_LIBRARY}
)

and the following way didn't work, at least for me:

target_link_libraries(binary regex system filesystem)

This follows what Maik says, but not only on Mac.