CMake can't find freeglut-3.0.0

Question

Freeglut-3.0.0 is build with cmake (MinGW makefiles) and mingw and then successfully installed with mingw32-make install to C:/Program Files (x86)/freeglut.

My CMakeLists.txt is:

    cmake_minimum_required(VERSION 3.7)

    project(math_tests)

    set(TESTS_SOURCES tests.cpp gl_core_3_3.c)
    set(CMAKE_CXX_STANDARD 11)

    # GLUT
    find_package(GLUT REQUIRED)
    include_directories(${GLUT_INCLUDE_DIR})
    if(NOT GLUT_FOUND)
        message(ERROR "GLUT not found!")
    endif(NOT GLUT_FOUND)

    # OpenGL
    find_package(OpenGL REQUIRED)
    include_directories(${OpenGL_INCLUDE_DIRS})
    link_directories(${OpenGL_LIBRARY_DIRS})
    add_definitions(${OpenGL_DEFINITIONS})
    if(NOT OPENGL_FOUND)
        message(ERROR "OPENGL not found!")
    endif(NOT OPENGL_FOUND)

    add_executable(tests ${TESTS_SOURCES})
    target_link_libraries(tests math ${GLUT_LIBRARIES} ${OPENGL_LIBRARIES})

Now CMake prints error: Could NOT find GLUT (missing: GLUT_glut_LIBRARY).

I can't figure out what I am doing wrong.

Answer 1

Your CMakeLists.txt file statement

find_package(GLUT REQUIRED)

is going to execute this code from FindGLUT.cmake

find_library( GLUT_glut_LIBRARY NAMES glut glut32 freeglut
    PATHS
    ${OPENGL_LIBRARY_DIR}
    ${GLUT_ROOT_PATH}/Release
    )

and find_library is in your scenario unable to find any of glut glut32 freeglut libraries, because it doesn't know where they are (which for you are under C:/Program Files (x86)/freeglut).

In your case you could set ${OPENGL_LIBRARY_DIR} to the right directory, that is the one containing the freeglut.dll file, for e.g.:

set(OPENGL_LIBRARY_DIR "C:/Program Files (x86)/freeglut/lib")

given the file is under C:/Program Files (x86)/freeglut/lib directory.