Assimp linker error - undefined references

Question

I have been trying to install Assimp 3.0 recently to load models from Blender to use in OpenGL.

My project is setup in Sublime Text 3, so I have created CMake files to generate the required make files for me to build my project.

All of the other libraries I am using, for example SFML, are being included and linked fine, but for some reason Assimp isn't working.

On build I get the following linker errors:

undefined reference to `Assimp::Importer::Importer()
undefined reference to `Assimp::Importer::~Importer()
undefined reference to `Assimp::Importer::~Importer()

Since this is a linker error I am under the assumption that my problem lies in my CMake files.

I created a FindASSIMP.cmake file to set some variables for me with the correct include directory and the path of the .lib files that need to be linked, and I can see that it is working fine because I can print the resulting variables and get the expected output.

I have two variables ${ASSIMP_INCLUDE_DIR} and ${ASSIMP_LIBRARY}.

In a release build:

${ASSIMP_INCLUDE_DIR} = C:/lib/assimp/3.0/include
${ASSIMP_LIBRARY} = C:/lib/assimp/3.0/lib/assimp_release-dll_win32/assimp.lib

My main CMake file which brings everything together goes something like this (with a lot of unrelated stuff stripped out):

set(EXE "main")

# Add sub-directories to create libraries from my files
add_subdirectory(various_sub_dirs)

add_executable(${EXE} my_sources.cpp)

# Link up my sub-directory libraries
target_link_libraries(${EXE} various_libraries_from_my_code)

# Link up external libraries
target_link_libraries(${EXE} ${ASSIMP_LIBRARY})
target_link_libraries(${EXE} ${GLEW_LIBRARIES})
target_link_libraries(${EXE} ${GLUT_LIBRARY})
target_link_libraries(${EXE} ${OPENGL_LIBRARIES})
# etc...

I don't get any include errors, so I know the inlcude directory is being used correctly, but for some reason, even though I can print out the exact path to the .lib file I am linking, it either isn't actually linking, or I'm linking the wrong thing.

Does anybody know why I am seeing these linker errors?

Do I need to link a different file? Or perhaps I need to link it in a certain order?

Any help would be appreciated because I can't see what I'm doing wrong.

If any more information is needed, please leave a comment and I will edit the question as soon as I can.

Answer 1

The problem was in the pre-compiled libraries that came with the full download of Assimp 3.0.

I used CMake and Make to compile the Assimp libraries myself and now it is working without any problems.