Cmake link library target link error

Question

Hi I have problem with linkg Glfw and other libraries using cmake. From command line i compile like this

g++ main.cpp -lGL -lGLU -lGLEW -lglfw 

But I wanted to use cmake for compiling. I tried to use target_linkg_libraries but this produce error

CMake Error at CMakeLists.txt:18 (target_link_libraries): Cannot specify link libraries for target "GL" which is not built by this
project.

I tried do this using add definitions. I dont see error but this don't link libraries.

cmake_minimum_required (VERSION 2.6) project (test)  find_package(OpenGL REQUIRED) find_package(GLEW REQUIRED)  ADD_DEFINITIONS(     -lGL     -lGLU     -lGLEW     -lglfw )  add_executable(test.out     main.cpp )  target_link_libraries(GL GLU GLEW glfw) 

Answer 1

The syntax for target_link_libraries is:

target_link_libraries(your_executable_name libraries_list) 

And you don't have to add add_definition statements (target_link_libraries adds this options)

There are also some useful variables provided by OpenGL and GLEW packages.

Your CMakeLists.txt should be like:

cmake_minimum_required (VERSION 2.6) project (test)  find_package(OpenGL REQUIRED) find_package(GLEW REQUIRED)  include_directories(${OPENGL_INCLUDE_DIR} ${GLEW_INCLUDE_DIRS})  add_executable(test     main.cpp )  target_link_libraries(test ${OPENGL_LIBRARIES} ${GLEW_LIBRARIES}) 

One important detail to keep in mind is to place the target_link_libraries after the add_executable (or add_library) line.