CMake: include Lemon library

Question

I just want to add the Lemon library to my CMakeLists.txt. When I was not using CMake I just added "-lemon" and everything went fine, but now I don't know the procedure to add that to the CMake file.

Edited do include my CMakeLists.txt:

# Created by the script cgal_create_cmake_script_with_options
# This is the CMake script for compiling a set of CGAL applications.

project( ssp )


cmake_minimum_required(VERSION 2.6.2)
if("${CMAKE_MAJOR_VERSION}.${CMAKE_MINOR_VERSION}" VERSION_GREATER 2.6)
  if("${CMAKE_MAJOR_VERSION}.${CMAKE_MINOR_VERSION}.${CMAKE_PATCH_VERSION}" VERSION_GREATER 2.8.3)
    cmake_policy(VERSION 2.8.4)
  else()
    cmake_policy(VERSION 2.6)
  endif()
endif()

set( CMAKE_ALLOW_LOOSE_LOOP_CONSTRUCTS true )

if ( COMMAND cmake_policy )

  cmake_policy( SET CMP0003 NEW )  

endif()

# CGAL and its components
find_package( CGAL QUIET COMPONENTS  )

if ( NOT CGAL_FOUND )

  message(STATUS "This project requires the CGAL library, and will not be compiled.")
  return()  

endif()

# include helper file
include( ${CGAL_USE_FILE} )


# Boost and its components
find_package( Boost REQUIRED )

if ( NOT Boost_FOUND )

  message(STATUS "This project requires the Boost library, and will not be compiled.")

  return()  

endif()

# include for local directory

# include for local package

set(CMAKE_CXX_FLAGS "-lemon")


# Creating entries for target: ssp
# ############################

add_executable( ssp  arrangement.cpp main.cpp polygonOperations.cpp scheduleGraph.cpp )

add_to_cached_list( CGAL_EXECUTABLE_TARGETS ssp )

# Link the executable to CGAL and third-party libraries
target_link_libraries(ssp   lemon ${CGAL_LIBRARIES} ${CGAL_3RD_PARTY_LIBRARIES} )

Answer 1

It's very simple, use target_link_libraries:

project(test)

add_executable(mine test.c)

target_link_libraries(mine m)

Where in this example, I'm linking against libm. In your case, m would be lemon. At least I think, I'm not sure from your question if the library name is lemon or emon since -l is the flag and the name should follow (ie -lm links libm).

For my simple example, if I run make VERBOSE=1 (and strip out the unimportant lines):

[100%] Building C object CMakeFiles/mine.dir/test.c.o
/usr/bin/cc    -o CMakeFiles/mine.dir/test.c.o   -c /home/tgallagher/temp/test.c
Linking C executable mine
/usr/local/bin/cmake -E cmake_link_script CMakeFiles/mine.dir/link.txt --verbose=1
/usr/bin/cc      CMakeFiles/mine.dir/test.c.o  -o mine -rdynamic -lm 

So it compiles the source file first, then it puts the -lm on the linker line.